CN111354981A - Battery cell structure, lithium battery and terminal equipment - Google Patents

Battery cell structure, lithium battery and terminal equipment Download PDF

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Publication number
CN111354981A
CN111354981A CN202010443100.7A CN202010443100A CN111354981A CN 111354981 A CN111354981 A CN 111354981A CN 202010443100 A CN202010443100 A CN 202010443100A CN 111354981 A CN111354981 A CN 111354981A
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battery
bending
cell structure
electrode plate
electrode
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何志明
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Beijing Xiaomi Mobile Software Co Ltd
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Beijing Xiaomi Mobile Software Co Ltd
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Priority to CN202010443100.7A priority Critical patent/CN111354981A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The disclosure relates to the technical field of lithium batteries, and particularly provides a battery cell structure, a lithium battery and terminal equipment. The battery cell structure comprises a plurality of groups of electrode plates which are sequentially stacked, wherein each electrode plate is provided with a stacking part and at least one bending part, and the at least one bending part is at least positioned on one side of the electrode plate in the first direction; the bent part is formed by bending one side of the electrode plate to the other side in the first direction; the electrode sheet portion connected to the bent portion forms the stacking portion. The battery core structure disclosed by the invention has higher utilization rate of the internal space of the battery core, the energy density of the battery is improved, and the laminated structure is suitable for being used as a special-shaped battery.

Description

Battery cell structure, lithium battery and terminal equipment
Technical Field
The disclosure relates to the technical field of lithium batteries, in particular to a battery cell structure, a lithium battery and a terminal device.
Background
The lithium ion battery is used as an energy storage device capable of being charged and discharged circularly, and is widely applied to the fields of electronic products, new energy automobiles and the like at present. In the cell structure of the lithium ion battery, the negative electrode plate needs to be over-designed (Overhang) relative to the positive electrode plate, that is, the size of the negative electrode plate needs to cover the positive electrode plate in both the length direction and the width direction. This is because, in the charging process of the lithium ion battery, if the negative electrode does not have a position for receiving lithium ions, lithium ions are precipitated on the surface of the negative electrode to form dendrites, and once the dendrites pierce the separator, the dendrites can cause short circuit of the battery, which can cause fire or explosion. Therefore, in order to improve the safety of the lithium battery, the negative electrode plate is designed to be partially more than the positive electrode plate in the length direction and the width direction.
For electronic equipment such as mobile phones and the like, the utilization rate of the internal space approaches the limit, and under the condition of a given battery volume, the capacity density of the battery is difficult to further improve. However, the overlap itself occupies a certain internal space of the battery, and particularly for the laminated battery core, the overlap needs to be designed in the length and width directions of the negative electrode, so that the space utilization rate of the battery core is greatly reduced, and the improvement of the energy density of the battery is influenced.
Disclosure of Invention
In order to solve the technical problem that the space utilization rate of the battery cell is low in the related art, the disclosure provides a battery cell structure, a lithium battery and a terminal device.
In a first aspect, embodiments of the present disclosure provide a battery cell structure, which includes a plurality of sets of electrode sheets stacked in sequence,
the electrode plate is provided with a stacking part and at least one bent part, and the at least one bent part is at least positioned on one side of the electrode plate in the first direction; the bent part is formed by bending one side of the electrode plate to the other side in the first direction; the electrode sheet portion connected to the bent portion forms the stacking portion.
In some embodiments, the electrode tabs include stacked positive and negative electrode tabs with a separator disposed between adjacent positive and negative electrode tabs, and the end edge of the negative electrode tab has a protruding portion protruding from the positive electrode tab.
In some embodiments, the electrode sheet has a plurality of bent portions, and the bent direction of one bent portion faces the bent outer side of the other bent portion in two adjacent bent portions; and the width of each of the stacking portions is the same in the first direction.
In some embodiments, before the electrode sheet is bent, two adjacent stacking portions are in an axisymmetric structure, and a symmetry axis is a bending central line of the bending portion; so that after the electrode plate is bent, the two stacking parts connected with the same bending part are completely overlapped.
In some embodiments, the electrode tab includes one bend formed by bending the electrode tab in a first direction into a U-shaped configuration.
In some embodiments, the positive electrode plate is provided with a positive electrode tab, the negative electrode plate is provided with a negative electrode tab, each positive electrode tab of the plurality of groups of electrode plates is electrically connected, and each negative electrode tab of the plurality of groups of electrode plates is electrically connected.
In a second aspect, an embodiment of the present disclosure provides a lithium battery including the cell structure according to any one of the embodiments of the first aspect.
In some embodiments, the lithium battery further comprises:
the battery cell structure is packaged in the shell, and the chamfer structure is arranged at the position of the bending part on the shell.
In a third aspect, an embodiment of the present disclosure provides a terminal device, including:
a lithium battery according to an embodiment of the second aspect, and
the shell comprises a front shell and a rear cover, wherein the lithium battery is arranged in the front shell, and the rear cover is provided with a matched arc-shaped structure at a position corresponding to the chamfering structure of the lithium battery shell.
In some embodiments, the terminal device is a mobile phone.
The electric core structure provided by the embodiment of the disclosure comprises a plurality of groups of electrode plates stacked in sequence, each electrode plate is provided with a stacking part and at least one bending part, each bending part is at least located on one side of the corresponding electrode plate in the first direction, each bending part is formed by bending one side of the corresponding electrode plate in the first direction to the other side, and each stacking part refers to an unbent straight edge part. Through buckling the laminated structure, the influence of overlap can be eliminated by the buckling part formed on one side, so that the battery space at the position of the buckling part is fully utilized, and under the condition of the same battery cell thickness (or the number of pole piece layers), the battery cell structure of the embodiment of the disclosure can have higher space utilization rate, correspondingly, the energy density of the battery can be improved under the same condition, and the battery cell structure is suitable for the batteries with any special-shaped structures.
The utility model provides a cell structure, including a plurality of kinks, in two adjacent kinks, the direction of buckling of one of them kink is towards the outside of buckling of another kink, and electrode slice is outwards buckled in proper order rather than inwards convoluteing promptly to still keep the characteristic of lamination electricity core, and the influence that removes overlap can all corresponding elimination in each kink position, thereby under the condition of the same electricity core thickness (or the pole piece number of piles), improve space utilization.
The cell structure provided by the embodiment of the disclosure comprises a bending part, namely, the electrode plates are only bent to form a U-shaped cell in sequence, so that the area of the electrode plates can be reduced as small as possible under the inventive concept of the disclosure, the impedance of the electrode plates can be reduced, the influence of overlap on one side of the cell can be eliminated under the condition that the performance of the laminated battery is hardly influenced, the space utilization rate of the battery can be improved, and the capacity density can be correspondingly improved.
The lithium battery and the terminal equipment provided by the embodiment of the disclosure comprise the battery cell structure, the lithium battery further comprises a shell, the battery cell structure is packaged inside the shell, the position of the shell corresponding to the bending part is provided with a chamfering structure, and the corresponding position of the rear cover of the terminal equipment is provided with an arc-shaped structure, so that the shape of the battery is matched with that of the rear cover of the terminal equipment, the utilization rate of the internal space of the mobile phone is greatly improved, and the battery capacity of the equipment can be correspondingly improved.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1a to 1c are schematic structural diagrams of a laminated cell.
Fig. 2 is a perspective view of a cell structure according to some embodiments of the present disclosure.
Fig. 3 is a front view of a cell structure according to some embodiments of the present disclosure.
Fig. 4 is a schematic cross-sectional view of a cell structure according to some embodiments of the present disclosure.
Fig. 5 is a schematic cross-sectional view of a cell structure according to further embodiments of the present disclosure.
Fig. 6 is a schematic cross-sectional view of a cell structure according to further embodiments of the present disclosure.
Fig. 7 is a schematic structural view of an electrode sheet according to some embodiments of the present disclosure.
Fig. 8 is a schematic cross-sectional view of a lithium battery in accordance with some embodiments of the present disclosure.
Fig. 9 is a schematic cross-sectional view of a terminal device in the related art.
Fig. 10 is a schematic cross-sectional view of a terminal device according to some embodiments of the present disclosure.
Detailed Description
The technical solutions of the present disclosure will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure. In addition, technical features involved in different embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other.
The electric core structure provided by the disclosure is suitable for a lithium ion battery. In the related art, the cell structure of the lithium ion battery can be mainly divided into a laminated type and a winding type. The laminated cell is formed by continuously stacking positive and negative pole pieces with specific structures, and separating the positive and negative pole pieces through a diaphragm to prevent short circuit. Fig. 1a to 1c show a conventional laminated cell structure.
As shown in fig. 1a, a common battery with a rectangular structure, such as a mobile phone battery, is formed by stacking a plurality of positive electrode sheets 100 and negative electrode sheets 200 in sequence, and a separator is disposed between adjacent positive and negative electrode sheets for separation (the separator is not shown in the figure).
The basic principle of charging the lithium ion battery is as follows: the external power supply charges the battery, electrons on the positive electrode move to the negative electrode through an external circuit, and lithium ions reach the negative electrode from the positive electrode through electrolyte and a diaphragm and are combined with the electrons to enter the negative electrode active material. However, if the negative electrode does not have a site for receiving lithium ions, lithium ions are precipitated on the surface of the negative electrode to form lithium dendrites, and once the dendrites penetrate through the separator and contact the positive electrode, the battery is short-circuited, causing ignition and even explosion.
Therefore, in order to ensure that the negative electrode has a sufficient position to receive lithium ions, in the related art, the negative electrode plate needs to be over-designed relative to the positive electrode plate, that is, the area of the negative electrode plate is larger than that of the positive electrode plate, and the part of the negative electrode plate extending out of the positive electrode plate is called overhang. As shown in fig. 1b and 1c, the overlap 300 is present on the negative electrode sheet in the directions of the four sides.
Referring to fig. 1b, due to the overlap 300, the overlap 300 area occupies the internal space of the battery in a given volume of the battery, so that the utilization rate of the internal space of the battery is greatly reduced, and the increase of the energy density of the battery is limited.
It should be noted that the cell structure also includes a winding type cell, in which a negative electrode plate of a continuous positive electrode plate is separated by a separator, and then continuous winding is performed. The influence of overlap in the coiling formula electricity core is less, but the coiling formula electricity core is because single long electrode, and therefore the electrical impedance is great to under the same volume, the ability density of coiling formula electricity core is lower than the lamination formula, and consequently the electrical property of coiling formula electricity core is worse than the lamination formula. More importantly, the winding type battery cell can only be made into batteries with specific structures, such as regular shapes of cylinders, rectangles and the like, and the winding type battery cell cannot be realized for special-shaped batteries such as L-shaped batteries and the like. In the development of electronic equipment such as mobile phones and the like, the internal space of the equipment is stacked and designed to be small in size, and the special-shaped battery is a necessary research direction for improving the endurance capacity of the equipment, so that the research on the laminated battery cell belongs to a more important direction.
Based on the above-mentioned drawbacks in the related art, some embodiments of the present disclosure provide a cell structure. In some embodiments, the battery cell structure provided by the present disclosure includes multiple sets of electrode sheets stacked in sequence, that is, multiple layers of positive electrode sheets and negative electrode sheets stacked in sequence, and adjacent positive electrode sheets and negative electrode sheets are separated by a separator. The electrode plate is provided with a stacking part and at least one bent part, the at least one bent part is positioned on one side of the electrode plate in a first direction, the bent part is formed by bending one side of the electrode plate in the first direction to the other side, and the electrode plate part connected with the bent part forms the stacking part.
This disclosed embodiment carries out once or bending many times with the electrode slice on the contact of lamination formula electricity core to then can eliminate overlap structure at the kink that forms, under the same pile up the number of piles up, compare in lamination formula electricity core and reduced overlap influence, improve the space utilization of electricity core, correspondingly improve the ability density of battery. Meanwhile, the battery cell structure of the present disclosure is still a laminated structure, and can be used as a battery cell of any shape, which is described in detail below.
One specific embodiment of the cell structure of the present disclosure is shown in fig. 2 to 4, and the cell structure of the present disclosure is described in detail below with reference to fig. 2 to 4.
In the present embodiment, the cell structure includes a plurality of sets of electrode sheets stacked in sequence, each electrode sheet includes a positive electrode sheet 100 and a negative electrode sheet 200 stacked in sequence, and adjacent positive electrode sheets 100 and negative electrode sheets 200 are separated by a separator to prevent short circuit. The positive plate 100 is provided with a positive tab, the negative plate 200 is provided with a negative tab, and the positive tab and the negative tab are electrically connected to form a positive electrode and a negative electrode of the battery cell.
The separator and the tab are not shown in the drawings for the sake of clarity of the structure shown in the drawings, but those skilled in the art will have no doubt understand the structure of the parts not shown on the basis of the related art. In addition, those skilled in the art should understand that the number of the laminations of the positive and negative electrode plates can be selected according to the needs, which is not limited by the present disclosure, and the coating manner and principle of the positive and negative electrode plates can be known by those skilled in the art, which is not described herein again.
As shown in fig. 4, in the present embodiment, the cell structure has a stacking portion 20 and one bending portion 10, and for convenience of description, the "left-right direction" shown in fig. 4 is defined as the "width direction" of the cell. The bent portion 10 is formed by bending one side of the electrode sheet to the other side in the width direction, and a straight edge portion connected to the bent portion 10 after bending forms the stacked portion 20. This embodiment corresponds to the conventional lamination structure in which all electrode tabs are folded in half at a time so that the cross sections of all the electrode tabs are symmetrical U-shaped.
In a specific implementation process, a plurality of different positive and negative electrode plates can be designed and processed according to the bending curvature radius of the electrode plates with different layers from small to large, and then the electrode plates are sequentially stacked according to a negative electrode plate, a diaphragm, a positive electrode plate, a diaphragm and a negative electrode plate to obtain the structure shown in fig. 2.
Similarly, in order to ensure the safety requirement of the electrode, in the present embodiment, it is necessary to design the overlap 300 of the negative electrode sheet and the positive electrode sheet, that is, the edge of the end of the negative electrode sheet has a protrusion (overlap) protruding from the positive electrode sheet. As shown in fig. 4, since the left side in the width direction of the electrode sheet is the bent portion 10, the overlap 300 structure is eliminated on one side in the width direction, and the overlap 300 structure exists only on the right side. Referring to fig. 3, it can be seen that, in the cell structure of the present embodiment, only one side in the width direction has an overlap 300, and compared with the scheme in fig. 1b, the space utilization rate in the width direction is obviously improved, and accordingly, the energy density of the battery is improved.
In addition, since the electrode impedance is increased as the area of the electrode sheet is larger, the laminated structure is bent only once in the present embodiment, which is still a laminated cell in nature, and still has an advantage of low impedance compared to a single continuous wound cell.
Comparing the scheme in fig. 1c, it can be seen that, under the condition of the same number of layers (or thickness of the battery cell) and the same width of the battery cell, the battery cell structure of the embodiment has an overlap 300 structure only on one side in the width direction, and the space of the left-side bent portion 10 can be fully used as the effective utilization space of the battery cell, so that the space utilization rate of the battery cell is greatly improved.
More importantly, the cell structure of the present disclosure is still a laminated cell in nature, and can still be applied to any shape of profiled battery. For example, in an L-shaped battery, the electrode tabs are only required to be designed to have a "convex" shape which is axisymmetrical along the bending center, so that the stacked portion 20 is L-shaped after being symmetrically bent. As will be described in detail hereinafter.
The above embodiment can be used as a preferred embodiment of the scheme of the present disclosure, and on the basis that almost all the advantages of the laminated battery cell, such as low impedance and suitability for the special-shaped battery, are retained, the space utilization rate of the battery cell is greatly improved, and the capacity density of the battery is correspondingly improved.
The main inventive concepts of the present disclosure are: in the laminated battery cell, the bending part is used for eliminating the influence of partial overlap, so that the space utilization rate of the battery cell is improved. Under the inventive concept, the cell structure of the present disclosure may have other alternative embodiments besides the above embodiments. Two alternative embodiments are shown in fig. 5 and 6, respectively.
As shown in fig. 5, in the present embodiment, the cell structure includes two bent portions 11 and 12, and the bending direction of the bent portion 12 is toward the outside of the bent portion 11, i.e., the two bent portions are bent in an S shape, rather than a winding type. As can be seen, compared with the battery cells with the same number of layers (or thickness), the influence of overlap is obviously reduced at the positions of the bent portion 11 and the bent portion 12, and the space utilization rate of the battery cells is improved.
As shown in fig. 6, in the present embodiment, the cell structure also includes two bent portions 13 and 14, but unlike the embodiment of fig. 5, the bending direction of the bent portion 14 is toward the inner side of the bent portion 13, that is, the two bent portions are bent in a winding manner. Similarly, compared with the battery cells with the same number of layers (or thickness), the influence of overhang is obviously reduced at the positions of the bent part 13 and the bent part 14, and the space utilization rate of the battery cells is improved.
Of course, the embodiments of fig. 5 and 6 are merely exemplary illustrations, and in other embodiments, the number of the bending portions may be more, for example, 3, 4, and the like, which is not limited by the present disclosure. However, it can be understood that, under the same width of the cell, the larger the number of the bending parts, the longer the length and the larger the area of the single electrode plate, and the larger the corresponding electrical impedance is similar to that of the wound cell. Therefore, the number of bending portions can be set as small as possible according to specific needs, and the embodiment of fig. 4 is optimal.
It should be particularly noted that even though some embodiments of the present disclosure involve multiple bending, the cell structure of the embodiments of the present disclosure is always based on a laminated cell, and is still different from the winding cell structure in the related art. The details will be described below.
In the related art, the winding type battery cell is a continuous single positive and negative electrode plate, and active materials are coated on both sides of the positive and negative electrode plate, so that active substances are kept between each group of adjacent positive and negative electrodes in the battery cell after winding. On the other hand, if the winding is performed as shown in fig. 6, for example, even if all electrode sheets are coated on both sides, the same effect is achieved in that the active material is present between the adjacent positive and negative electrodes, but the thickness of the two current collectors is increased. If more layers of pole pieces are arranged, the thickness of the current collector is increased, and the effect is the same. In other words, in the case of the same cell thickness, the more the positive and negative electrode sheets are provided in the conventional wound cell, the lower the energy density of the entire cell is.
In the embodiment of the present disclosure, bending the electrode sheet is based on "solving the problem of low space utilization of the laminated battery due to overhang". Even in some embodiments of the present disclosure, after bending multiple times, although the overlap of the laminated cell can be reduced accordingly, the problem of reduced cell energy density is also faced. Therefore, in some embodiments of the present disclosure, the number of pole pieces is not increased on the basis of the winding type battery cell, but still, in the main inventive concept, in order to reduce the occupation of the overlap of the laminated type battery cell to the space, if there is no such enlightenment, a person skilled in the art will not have any need to add pole pieces to the winding type battery cell.
In the embodiments of fig. 5 and 6, the cell structure is still applied to the profile battery. Taking an L-shaped cell as an example, as shown in fig. 7, before the positive and negative electrode plates are bent, two adjacent stacking portions on the electrode plates may be set to be axisymmetric structures, and the symmetry axis is a bending center line of the bending portion, so as to be analogized. Specifically, the stacking portion 101 and the stacking portion 102 together form a concave structure, which is symmetrical about the symmetry axis a, and the stacking portion 101 and the stacking portion 102 can be completely overlapped after being bent toward each other. Similarly, the stacking portion 102 and the stacking portion 103 are symmetrical about the symmetry axis b, and after the three are sequentially bent, an L-shaped pole piece can be formed. Therefore, in the embodiment of the disclosure, the cell structure is suitable for being used as a special-shaped battery.
Therefore, in the battery cell structure provided by the embodiment of the present disclosure, by bending the laminated battery cell, the bending portion formed on one side can eliminate the influence of overhang, so that the battery space at the position of the bending portion is fully utilized, and under the condition of the same battery cell thickness (or the number of pole pieces), the battery cell structure of the embodiment of the present disclosure can have a higher space utilization rate, and accordingly, the energy density of the battery can be improved under the same condition, and the battery cell structure of the present disclosure is suitable for the battery with any special-shaped structure.
In a second aspect, the present disclosure provides a lithium battery including the cell structure described in any of the above embodiments.
In some embodiments, the cell structure may have a bending portion, so that the battery may be shaped correspondingly to the bending portion. Specifically, as shown in fig. 8, the lithium battery includes a casing 610, and a cell structure is enclosed in the casing 610, where the cell structure is exemplified by the embodiment of fig. 4. At one side of the electric core located at the bending portion, the housing 610 is correspondingly provided with a chamfer structure 620. The chamfer structure 620 may form an escape space to cooperate with the arc of the device housing to increase the size of the battery. As will be described in detail hereinafter.
In a third aspect, the disclosed embodiments provide a terminal device, where the terminal device may be an electronic device that requires a lithium battery, such as a mobile phone, a tablet computer, and a personal digital assistant, and the disclosure is not limited thereto.
Taking a smart phone as an example, the hand feeling of holding the smart phone has become one of the more and more sought machine purchasing indexes of people in the development of the smart phone so far, more and more mobile phone rear covers are arranged into the radian of multiple curved surfaces, so that the holding comfort is increased, but the radian of the rear cover can correspondingly influence the volume of a battery.
As shown in fig. 9, the mobile phone housing includes a front case 710 and a rear cover 720, the lithium battery 600 is disposed inside the front case 710, and since the rear cover 720 is provided with the arc-shaped structure 730, the rectangular lithium battery 600 is shortened in width direction in order to avoid the arc-shaped structure 730, thereby reducing the battery capacity and wasting the internal space of the mobile phone.
And in this disclosure's electric core structure, because electric core structure one side has the kink, consequently can correspond on lithium battery shell 610 and set up chamfer structure 620 to as shown in fig. 10, chamfer structure 620 just can form the cooperation with arc structure 730 on the back lid 720, makes battery 600 fill up the inner space of arc structure 730, has improved the volume of battery greatly, and then improve equipment duration.
It should be understood that the above embodiments are only examples for clearly illustrating the present invention, and are not intended to limit the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the present disclosure may be made without departing from the scope of the present disclosure.

Claims (10)

1. A battery cell structure is characterized by comprising a plurality of groups of electrode plates which are stacked in sequence,
the electrode plate is provided with a stacking part and at least one bent part, and the at least one bent part is at least positioned on one side of the electrode plate in the first direction; the bent part is formed by bending one side of the electrode plate to the other side in the first direction; the electrode sheet portion connected to the bent portion forms the stacking portion.
2. The cell structure of claim 1,
the electrode slice comprises stacked positive plates and negative plates, a diaphragm is arranged between every two adjacent positive plates and negative plates, and the end edge of each negative plate is provided with a protruding part protruding out of the positive plate.
3. The cell structure of claim 1,
the electrode plate is provided with a plurality of bending parts, and the bending direction of one bending part faces the bending outer side of the other bending part in two adjacent bending parts; and the width of each of the stacking portions is the same in the first direction.
4. The cell structure of claim 1,
before the electrode plate is bent, two adjacent stacking parts are in an axisymmetric structure, and a symmetry axis is a bending central line of the bending part; so that after the electrode plate is bent, the two stacking parts connected with the same bending part are completely overlapped.
5. The cell structure of claim 1,
the electrode plate comprises a bending part, and the bending part is formed by bending the electrode plate into a U-shaped structure in a first direction.
6. The cell structure of claim 2,
the cathode plate is provided with a cathode tab, each cathode tab of the plurality of electrode plates is electrically connected, and each cathode tab of the plurality of electrode plates is electrically connected.
7. A lithium battery comprising a cell structure according to any one of claims 1 to 6.
8. The lithium battery of claim 7, further comprising:
the battery cell structure is packaged in the shell, and the chamfer structure is arranged at the position of the bending part on the shell.
9. A terminal device, comprising:
a lithium battery as in claim 8, and
the shell comprises a front shell and a rear cover, wherein the lithium battery is arranged in the front shell, and the rear cover is provided with a matched arc-shaped structure at a position corresponding to the chamfering structure of the lithium battery shell.
10. The terminal device according to claim 9, wherein the terminal device is a mobile phone.
CN202010443100.7A 2020-05-22 2020-05-22 Battery cell structure, lithium battery and terminal equipment Pending CN111354981A (en)

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CN112151747A (en) * 2020-09-27 2020-12-29 新余赣锋电子有限公司 Pole piece, battery cell, lamination method of battery cell and button cell
CN113394372A (en) * 2021-06-29 2021-09-14 深圳市德方纳米科技股份有限公司 Battery core, preparation method thereof and battery
WO2024051477A1 (en) * 2022-09-08 2024-03-14 荣耀终端有限公司 Battery

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CN102089921A (en) * 2008-07-09 2011-06-08 夏普株式会社 Flat rechargeable battery and production method of same
CN105355851A (en) * 2015-12-03 2016-02-24 辉能（天津）科技发展有限公司 Flexible electrode with slender holes and battery with electrode

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CN2538072Y (en) * 2002-04-04 2003-02-26 北京星恒电源有限公司 Safety large volume non-water electrolyte battery
CN102089921A (en) * 2008-07-09 2011-06-08 夏普株式会社 Flat rechargeable battery and production method of same
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CN112151747A (en) * 2020-09-27 2020-12-29 新余赣锋电子有限公司 Pole piece, battery cell, lamination method of battery cell and button cell
CN113394372A (en) * 2021-06-29 2021-09-14 深圳市德方纳米科技股份有限公司 Battery core, preparation method thereof and battery
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Application publication date: 20200630