WO2022105530A1 - 卷绕电芯、电池结构、柔性显示装置及热压装置 - Google Patents

卷绕电芯、电池结构、柔性显示装置及热压装置 Download PDF

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Publication number
WO2022105530A1
WO2022105530A1 PCT/CN2021/125422 CN2021125422W WO2022105530A1 WO 2022105530 A1 WO2022105530 A1 WO 2022105530A1 CN 2021125422 W CN2021125422 W CN 2021125422W WO 2022105530 A1 WO2022105530 A1 WO 2022105530A1
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WIPO (PCT)
Prior art keywords
plane
side plane
wound
chamfer
bent
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PCT/CN2021/125422
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English (en)
French (fr)
Inventor
崔越
魏悦涵
陈思彤
朱红
时博阳
Original Assignee
京东方科技集团股份有限公司
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Publication of WO2022105530A1 publication Critical patent/WO2022105530A1/zh

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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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H01M10/0409—Machines for assembling batteries for cells with wound electrodes
    • 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

Definitions

  • the present disclosure relates to the field of display technology, and in particular, to a wound cell, a battery structure, a flexible display device, and a hot pressing device.
  • the battery structure is required to have certain bending properties and good ionic conductivity.
  • the ionic conductivity and bending performance of the currently provided battery structure are difficult to meet the requirements, which affects the product quality.
  • the purpose of the present disclosure is to provide a wound cell, a battery structure, a flexible display device and a hot pressing device, which can improve product quality.
  • a first aspect of the present disclosure provides a wound battery core, wherein the wound battery core has a first end face and a second end face opposite to each other in the winding axis direction, and the first end face and the second end face are located on the first end face and the second end face.
  • the outer peripheral surface between the end surfaces, the outer peripheral surface includes four side planes connected end to end in sequence, and at least the connection between the adjacent two side planes is chamfered; wherein, the first end surface and the second end surface are At least one is protruded with a pole lug, and the pole lug can be bent to the side plane.
  • the four side planes include a first side plane and a third side plane parallel to the first reference plane and a second side plane and a second side plane parallel to the second reference plane
  • Four side planes, the first side plane, the second side plane, the third side plane and the fourth side plane are connected end to end in sequence; wherein, the first reference plane and the second reference plane perpendicular to each other and parallel to the winding axis.
  • the chamfer is a camber chamfer or a plane chamfer.
  • the arc chamfering is a circular arc chamfering.
  • the radius of the arc chamfer is 0.4 mm to 5 mm.
  • the chamfer is a plane chamfer
  • the width of the orthographic projection of the plane chamfer on the first reference plane is a first width
  • the plane chamfer is at the location where the chamfer is located.
  • the width of the orthographic projection on the second reference parallel is a second width
  • the first width is equal to the second width.
  • the first width and the second width are 0.4 mm to 5 mm.
  • At least two tabs are provided, and the at least two tabs include positive tabs and negative tabs, the positive tabs are protruded from the first end surface, and the negative tabs The tabs are protruded and arranged on the second end face;
  • the positive electrode tab and the negative electrode tab can be bent on the same side plane or respectively on different side planes;
  • the side plane opposite to the bent positive electrode tab and the negative electrode tab is the target side plane, and the connection between the target side plane and its adjacent two side planes is chamfered. .
  • the positive electrode tab and the negative electrode tab can be bent to the first side plane, and the first side plane is connected to the second side plane and the first side plane.
  • the connection of the four side planes is chamfered.
  • connection between the third side plane and the second side plane and the fourth side plane is chamfered.
  • a second aspect of the present disclosure provides a battery structure for a flexible display device, comprising:
  • At least two wound cells arranged at intervals in the horizontal direction are the wound cells described in any one of the above, and the positive electrode tabs and the negative electrode tabs of the wound cells are folded Bend to the target side plane, and the horizontal direction is perpendicular to the winding axis;
  • At least one first flexible conductive sheet two ends of the first flexible conductive sheet are respectively connected with the positive tabs of the two adjacent wound cells, and the middle part of the first flexible conductive sheet can be bent ;
  • At least one second flexible conductive sheet two ends of the second flexible conductive sheet are respectively connected with the negative electrode tabs of the two adjacent wound cells, and the middle part of the second flexible conductive sheet can be bent .
  • the positive electrode tab and the negative electrode tab are bent to the first side plane, wherein the first side plane of each of the wound cells is located in the same plane .
  • a third aspect of the present disclosure provides a flexible display device including the battery structure described above.
  • a fourth aspect of the present disclosure provides a heat pressing device for winding a battery cell, which includes a first mold and a second mold, the first mold and the second mold are capable of relative movement to enclose a mold for heating
  • the hot-pressing cavity of the wound electric core is pressed, and the inner peripheral surface of the hot-pressing cavity matches the outer peripheral surface of any one of the above-mentioned wound electric cores.
  • the wound cell, the battery structure, the flexible display device and the hot pressing device of the present disclosure can improve the gap between the separator and the pole piece by arranging the connection between at least two adjacent two sides of the wound cell to be chamfered.
  • the interface contact can reduce the internal resistance of the battery, improve the ionic conductivity, and then improve the capacity utilization rate; in addition, by chamfering the connection between at least two adjacent planes of the wound cells, the battery structure can also be improved.
  • the problem of stress concentration is prone to occur at the corners of the wound cells, which improves the bending reliability and flatness of the product.
  • FIG. 1 shows a schematic plan view of a square cell in the related art
  • FIG. 2 shows a schematic plan view of the wound cell according to an embodiment of the present disclosure from a first viewing angle
  • FIG. 3 shows a schematic plan view of the wound cell according to an embodiment of the present disclosure from a second viewing angle
  • FIG. 4 shows a schematic plan view of the wound cell according to another embodiment of the present disclosure from a second viewing angle
  • FIG. 5 shows a schematic plan view of the wound cell according to another embodiment of the present disclosure from a second viewing angle
  • FIG. 6 shows a schematic structural diagram of a hot pressing device according to an embodiment of the present disclosure
  • FIG. 7 shows a schematic diagram of the hot-pressing device according to an embodiment of the present disclosure when the cell is not hot-pressed
  • FIG. 8 is a schematic diagram illustrating the hot pressing of the cell by the hot pressing device according to an embodiment of the present disclosure
  • FIG. 9 shows a schematic plan view of the battery structure according to an embodiment of the present disclosure from a first viewing angle
  • FIG. 10 shows a schematic plan view of the battery structure according to an embodiment of the present disclosure from a second viewing angle.
  • a plurality of square cells a as shown in FIG. 1 can be arranged at intervals, and flexible conductive sheets are used to connect the Each square battery cell a is connected in series or in parallel to form a battery structure; wherein, the part of the flexible conductive sheet that is suspended relative to the square battery core a can be bent, so as to realize the bending of the entire battery structure.
  • the square battery core a can be a wound battery core.
  • the manufacturing process of the square battery core a can be as follows: the positive and negative electrode sheets and the separator are wound to form an energy storage unit. Due to the winding process The interior of the produced energy storage unit is often fluffy. Therefore, a hot pressing process needs to be introduced later to shape the energy storage unit wound for a certain number of turns to form a square cell a; among them, in the hot pressing process, due to The combined action of heat and pressure can make the diaphragm coated with the adhesive layer bond with the positive and negative electrode sheets to form a good interface contact, but the hot-pressed square cell a is prone to hot-pressed dead corners, which reduces the ionic conductivity. rate, affecting capacity performance.
  • the wound cell 10 includes a positive electrode sheet, a negative electrode sheet and a separator that are stacked and wound together.
  • the separator is located between the positive electrode sheet and the separator. between the negative electrode sheets to achieve insulation between the positive electrode sheet and the negative electrode sheet; and the separator is coated with an adhesive layer for bonding with the positive electrode sheet and the negative electrode sheet.
  • the wound battery 10 may further include at least two tabs, and the at least two tabs may include a positive tab 108 and a negative tab 109 , and the positive tab 108 may be fixed by welding or riveting.
  • the positive electrode tab 108 and the positive electrode tab can also be cut into one piece; the negative electrode tab 109 can be connected to the negative electrode tab by welding or riveting, but not limited to this.
  • the tabs 109 and the negative electrode sheet can also be cut into one piece.
  • the wound cell 10 of the present disclosure is formed by winding the stacked positive electrode sheet, the negative electrode sheet and the separator for multiple turns. Therefore, it can be seen that the wound cell 10 of the embodiment of the present disclosure is rigid as a whole. , that is, the winding is electrically less prone to bending deformation as a whole.
  • the wound cell 10 of the present disclosure is reshaped after winding, so that a good interface contact is formed between the separator and the pole piece.
  • the core 10 may have a first end surface 101 and a second end surface 102 opposite to each other in the winding axis Z, and an outer peripheral surface located between the first end surface 101 and the second end surface 102, and the outer peripheral surface may include four end-to-end connected in sequence.
  • the side plane as shown in Figure 3, and at least the junction of the adjacent two sides of the plane is provided with a chamfer 107; by setting at least the junction of the adjacent two sides of the plane with a chamfer 107, the diaphragm and the pole piece can be improved here.
  • the interface contact between them can reduce the internal resistance of the battery, improve the ionic conductivity, and then improve the capacity utilization rate.
  • At least one of the first end surface 101 and the second end surface 102 of the embodiment of the present disclosure is provided with a tab protruding, and the tab can be bent to the side plane to match the
  • the flexible conductive sheet is connected, and the flexible conductive sheet is used to connect a plurality of tabs of the wound cell 10 arranged at intervals to form a battery structure. Since at least the connection between the two adjacent planes in the embodiment of the present disclosure is inverted The corners 107 are provided, therefore, the problem of stress concentration easily occurring at the corners of the flexible conductive sheet and the wound cell 10 during the bending process of the battery structure can also be improved, thereby improving the bending reliability and flatness of the product.
  • the four side planes in the outer peripheral surface of the wound cell 10 may include a first side plane 103 and a third side plane 105 parallel to the first reference plane, and a first side plane 103 parallel to the first reference plane.
  • the second side plane 104 and the fourth side plane 106 that are parallel to the two reference planes, the first side plane 103 , the second side plane 104 , the third side plane 105 and the fourth side plane 106 are connected end to end in sequence;
  • a chamfer 107 is formed between at least two adjacent ones of the one side plane 103 , the second side plane 104 , the third side plane 105 and the fourth side plane 106 .
  • first reference plane and the second reference plane of the embodiment of the present disclosure are perpendicular to each other, and both are parallel to the aforementioned winding axis Z.
  • the positive electrode tab 108 of the wound cell 10 can be protruded from the first end surface 101
  • the negative electrode tab 109 can be protruded from the second end surface 102 .
  • the positive electrode tabs 108 and the negative electrode tabs 109 may be directly opposite to each other in the winding axis Z, but not limited thereto, the positive electrode tabs 108 and the negative electrode tabs 109 may also be arranged in a staggered position, depending on the specific situation.
  • first end face 101 may be provided with one positive tab 108 protruding, but not limited to this, and two or more may be provided, depending on the specific situation; similarly, the second end face 102 may be provided with one protruding tab 108 .
  • the negative electrode tabs 109 can also be provided with two or more, depending on the specific situation.
  • the positive electrode tab 108 and the negative electrode tab 109 can be bent to the same side plane, for example: both can be bent to the first side plane 103, but not limited to this; the positive electrode tab 108 and the negative electrode tab 109 can also be bent Bending to different side planes, for example: the positive tab 108 can be bent to the first side plane 103, the negative tab 109 can be bent to the fourth side plane 106; or the positive tab 108 can be bent to the second side plane 104, the negative tab 109 can be bent to the third side plane 105 and so on.
  • the side plane opposite to the bent positive electrode tab 108 and the negative electrode tab 109 can be defined as the target side plane, and the connection between the target side plane and the adjacent two side planes can be defined as the target side plane. They are all set with chamfered corners 107, so the design can further improve the interface contact between the pole piece and the separator, and improve the appearance of the wound cell 10, thereby reducing the internal resistance of the battery, improving the ionic conductivity, and thus improving the capacity utilization rate; , by making the connection between the target side plane and its adjacent two side planes be chamfered 107, it can also reduce the difficulty of arranging a plurality of wound cells 10, so as to facilitate the connection to form a battery structure, in addition, it can also improve the During the bending process of the battery structure, the problem of stress concentration is likely to occur at the corners of the flexible conductive sheet and the wound cell 10, so that the bending reliability and flatness of the product can be improved.
  • both the positive electrode tab 108 and the negative electrode tab 109 can be bent to the first side plane 103, as shown in FIG. 3, the first side plane 103, the second side plane 104 and the fourth side plane 106
  • the connection can be provided with a chamfer 107 .
  • the junctions of the third side plane 105 , the second side plane 104 and the fourth side plane 106 may also be chamfered 107 , so as to improve the overall topographic accuracy of the wound cell 10 and the cell capacity.
  • the aforementioned chamfer 107 may be a camber chamfer or a plane chamfer, both of which will be described in detail below.
  • the arc chamfering can be a circular arc chamfering.
  • This design can improve the overall topographic accuracy of the battery cell and the battery cell capacity, and also improve the performance of the battery.
  • the problem of stress concentration is likely to occur at the corners of the flexible conductive sheet and the wound cell 10, which improves the bending reliability and flatness of the product.
  • the radius of the arc chamfer can be 0.4mm to 5mm; further, the radius of the arc chamfer can be 0.5mm to 2mm, for example: 0.5mm, 1mm, 1.5mm, 2mm, etc., according to the experimental surface, when bending, the maximum stress at the corner of the flexible conductive sheet and the square cell a of the related art in FIG. 1 can be 3.172e-1Mpa.
  • the maximum stress at the arc chamfer with a radius of 0.5 mm in the wound cell 10 of the embodiment of the present disclosure can be 3.05e-1 Mpa, and the flexible conductive sheet is opposite to the arc of the wound cell 10 in the embodiment of the present disclosure with a radius of 2 mm.
  • the maximum stress at the corner can be 2.91e-1Mpa; it can be seen that in the embodiment of the present disclosure, by setting the arc chamfer at the connection of at least two adjacent planes in the wound cell 10, compared with the related part in FIG. 1
  • the square cell a in the technology can reduce the concentrated stress generated during the bending process, thereby improving the bending reliability and flatness of the product.
  • the radius of the arc chamfer by designing the radius of the arc chamfer to be no less than 0.5mm, it can avoid that the arc chamfer is too small to better solve the problem of stress concentration, so as to improve the bending reliability and smoothness of the product degree; by designing the radius of the arc chamfer to be no more than 2mm, it can avoid the situation that the inside of the wound cell 10 is prone to short circuit due to the excessively large arc chamfer, thereby improving the product quality.
  • the chamfer 107 may be a plane chamfer
  • the width of the orthographic projection of the plane chamfer on the first reference plane may be a first width W1
  • the plane chamfer may be the width of the orthographic projection on the second reference parallel
  • the first width W1 and the second width W2 can be equal.
  • the first width W1 and the second width W2 may be 0.4mm to 5mm, and further, the first width W1 and the second width W2 may be 0.5mm to 2mm, for example: 0.5mm, 1mm, 1.5mm, 2mm
  • this design can avoid the situation that the plane chamfer is too small to reduce the internal resistance of the battery; quality.
  • the embodiment of the present disclosure also provides a hot pressing device matching the wound cell 10, as shown in FIG. 6,
  • the hot-pressing device may include a first mold 13 and a second mold 14, the first mold 13 and the second mold 14 can move relative to each other to enclose a hot-pressing cavity for the hot-pressed winding cell 10 , the inner peripheral surface of the hot pressing cavity matches the outer peripheral surface of the wound cell 10 according to any of the foregoing embodiments of the present disclosure.
  • the top of the first mold 13 may be provided with an accommodating groove 130 for accommodating the wound cell 10 .
  • the accommodating groove 130 has a groove bottom surface 130 a and groove side surfaces on opposite sides of the groove bottom surface 130 a 130b, the junction of the groove bottom surface 130a and the groove sides 130b on opposite sides is chamfered 130c; set; and the second die 14 may include a punching head 140, when the second die 14 moves toward the direction of the first die 13,
  • the punching head 140 can extend into the receiving groove 130, and the bottom surface 140a of the punching head 140, the groove bottom surface 130a and the two groove side surfaces 130b can enclose the aforementioned hot pressing cavity.
  • the groove bottom surface 130a, the groove side surface 130b and the bottom surface 140a of the punching head 140 can be matched with the four side planes of the above-mentioned wound cell 10, that is, all of them have a planar design; the groove bottom surface 130a
  • the chamfer 130c at the connection with the side surface 130b of the slot can be matched with the chamfer 107 of the wound cell 10 mentioned above, that is, when the required chamfer 107 of the wound cell 10 is an arc chamfer, the slot
  • the chamfer 130c at the connection between the bottom surface 130a and the slot side 130b can also be a circular arc chamfer; when the chamfer 107 of the desired wound cell 10 is a plane chamfer, the chamfer at the connection between the slot bottom 130a and the slot side 130b 130c may also be a flat chamfer.
  • the side plane opposite to the bottom surface 130a of the groove in the wound cell 10 may be the first side plane 103 mentioned above.
  • the positive electrode tab 108 and the negative electrode tab 109 can be bent onto the first side plane 103 so that the flexible conductive sheet connects the tabs of each wound cell 10 to form a battery structure.
  • the hot pressing device may further include at least two guide rods 15
  • the second die 14 may further include a sliding mounting portion 141 disposed on the top of the punching head 140 , and the sliding mounting portion 141 can slide with each guide rod 15 Connect and move along the guide rod 15 toward or away from the first mold 13 .
  • the movement track of the second mold 14 can be ensured, thereby ensuring the quality of hot pressing.
  • the hot pressing device may further include a driving structure (not shown in the figure) connected with the second mold 14 , and the driving structure can drive the second mold 14 to move toward or away from the first mold 13 .
  • the wound cell b can be placed in the accommodating groove 130 of the first mold 13 first; then, the second mold 14 is driven to approach the first mold 13, the punching head 140 of the second die 14 cooperates with the accommodating groove 130 to hot-press the battery cell b in the accommodating groove 130 into the wound battery cell 10 as shown in FIG. 8 .
  • the wound cell 10 processed by the hot pressing device of the embodiment of the present disclosure can effectively improve the width and thickness of the winding core and the uncontrollable size compared with the square cell a formed by conventional hot pressing in the related art. At the same time, under the condition of ensuring the battery capacity, the rate performance of the battery is further improved.
  • An embodiment of the present disclosure further provides a battery structure, which includes at least two wound cells 10 described in any of the foregoing embodiments.
  • the positive tabs of the wound cells 10 108 and the negative electrode tab 109 are bent to the target side plane, wherein at least two wound cells 10 are arranged at intervals in the horizontal direction X, and the horizontal direction X is perpendicular to the winding axis Z.
  • the battery structure may further include at least one first flexible conductive sheet 11 and at least one second flexible conductive sheet 12 , two ends of the first flexible conductive sheet 11 are respectively connected to two adjacent rolls
  • the positive electrode tabs 108 of the wound cells 10 are connected.
  • the two ends of the first flexible conductive sheet 11 can be connected to the positive electrode tabs 108 of two adjacent wound cells 10 by welding or the like.
  • the two adjacent wound cells 10 are arranged at intervals in the horizontal direction X.
  • the middle part of the first flexible conductive sheet 11 is suspended relative to the wound cells 10, and the middle part of the first flexible conductive sheet 11 can be bent
  • the two ends of the second flexible conductive sheet 12 are respectively connected with the negative electrode tabs 109 of the two adjacent wound cells 10.
  • the two ends of the second flexible conductive sheet 12 can be connected to the adjacent ones by welding or the like.
  • the positive tabs 108 of the two wound cells 10 are connected; among them, since the two adjacent wound cells 10 are arranged at intervals in the horizontal direction X, it can be seen that the middle part of the second flexible conductive sheet 12 is opposite to the wound cells 10 is suspended in the air, and the middle part of the second flexible conductive sheet 12 can be bent.
  • the battery structure can be bent along the middle part of the first flexible conductive sheet 11 and the second flexible conductive sheet 12 to realize the bending of the battery structure; that is, the battery of the embodiment of the present disclosure
  • the structure can be bent, and the battery structure can be applied to electronic products such as flexible display devices.
  • the flexible conductive sheet and the wound cell can be improved during the bending process.
  • the problem of stress concentration is easy to occur at the corners, which can improve the bending reliability and flatness of the product.
  • the positive tab 108 and the negative tab 109 of the wound cell 10 are bent to the first side plane 103 of the wound cell 10 , wherein the first side plane 103 of each wound cell 10 is located at the same In the plane, this design facilitates the connection between the flexible conductive sheet and the adjacent wound cells 10, and can also ensure the connection stability of the flexible conductive sheet and the wound cells 10 when not bent; in addition, it can also ensure the entire battery structure.
  • the flatness of the battery is convenient for the assembly of the battery structure and the whole machine.
  • An embodiment of the present disclosure further provides a flexible display device, which includes the battery structure described in any of the foregoing embodiments; it should be understood that the flexible display device may further include a flexible display panel, and the flexible display panel has a bendable area. It can correspond to the middle part of the flexible conductive sheet in the battery structure, so as to realize the overall bending of the flexible display device.
  • the flexible display device may also include other components and components, such as circuit boards, casings, etc.
  • the specific use requirements of the system should be supplemented accordingly, and will not be repeated here.
  • the specific type of the flexible display device is not particularly limited, and any type of flexible display device commonly used in the art can be used, such as televisions, mobile phones, computers, medical equipment, etc.
  • the specific application of the flexible display device is selected accordingly, and details are not repeated here.

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Abstract

本公开涉及电池技术领域，具体而言，涉及一种卷绕电芯、电池结构、柔性显示装置及热压装置。所述卷绕电芯具有在卷绕轴向上相对的第一端面和第二端面及位于所述第一端面和所述第二端面之间的外周面，所述外周面包括依次首尾相连的四个侧平面，且至少相邻两侧平面的连接处呈倒角设置；其中，所述第一端面和所述第二端面中至少一者上凸出设置有极耳，所述极耳能够折弯到所述侧平面处。该方案可提高产品质量。

Description

卷绕电芯、电池结构、柔性显示装置及热压装置 技术领域
本公开涉及显示技术领域，具体而言，涉及一种卷绕电芯、电池结构、柔性显示装置及热压装置。
背景技术
随着柔性手机等电子产品的不断发展，用户对柔性电子产品中的电池结构也提出了较高的要求，例如：要求电池结构具有一定的弯折性能和良好的离子导电率。但目前提供的电池结构的离子导电率和弯折性能很难达到要求，影响产品质量。
需要说明的是，在上述背景技术部分公开的信息仅用于加强对本公开的背景的理解，因此可以包括不构成对本领域普通技术人员已知的现有技术的信息。
发明内容
本公开的目的在于提供一种卷绕电芯、电池结构、柔性显示装置及热压装置，可提高产品质量。
本公开第一方面提供了一种卷绕电芯，其中，所述卷绕电芯具有在卷绕轴向上相对的第一端面和第二端面及位于所述第一端面和所述第二端面之间的外周面，所述外周面包括依次首尾相连的四个侧平面，且至少相邻两侧平面的连接处呈倒角设置；其中，所述第一端面和所述第二端面中至少一者上凸出设置有极耳，所述极耳能够折弯到所述侧平面处。
在本公开的一种示例实施例中，所述四个侧平面包括与第一参考平面相平行的第一侧平面和第三侧平面及与第二参考平面相平行的第二侧平面和第四侧平面，所述第一侧平面、所述第二侧平面、所述第三侧平面及所述第四侧平面依次首尾相连；其中，所述第一参考平面和所述第二参考平面相互垂直，并均与所述卷绕轴向相平行。
在本公开的一种示例实施例中，所述倒角为弧面倒角或平面倒角。
在本公开的一种示例实施例中，所述弧面倒角为圆弧倒角。
在本公开的一种示例实施例中，所述圆弧倒角的半径为0.4mm至5mm。
在本公开的一种示例实施例中，所述倒角为平面倒角，所述平面倒角在所述第一参考平面上的正投影的宽度为第一宽度，所述平面倒角在所述第二参考平行上的正投影的宽度为第二宽度，所述第一宽度与所述第二宽度相等。
在本公开的一种示例实施例中，所述第一宽度和所述第二宽度为0.4mm至5mm。
在本公开的一种示例实施例中，所述极耳设置至少两个，至少两个包括正极极耳和负极极耳，所述正极极耳凸出设置在所述第一端面，所述负极极耳凸出设置在所述第二端面；
所述正极极耳和所述负极极耳能够折弯到同一所述侧平面上或分别折弯到不同所述侧平面上；
其中，用于与折弯后的所述正极极耳和所述负极极耳相对的侧平面为目标侧平面，所述目标侧平面和与其相邻的两侧平面的连接处均呈倒角设置。
在本公开的一种示例实施例中，所述正极极耳和所述负极极耳能够折弯到所述第一侧平面，所述第一侧平面与所述第二侧平面和所述第四侧平面的连接处呈倒角设置。
在本公开的一种示例实施例中，所述第三侧平面和所述第二侧平面和所述第四侧平面的连接处呈倒角设置。
本公开第二方面提供了一种电池结构，用于柔性显示装置，其包括：
至少两个在水平方向上间隔排布的卷绕电芯，所述卷绕电芯为上述任一项所述的卷绕电芯，所述卷绕电芯的正极极耳和负极极耳折弯到所述目标侧平面，且所述水平方向与所述卷绕轴向相垂直；
至少一个第一柔性导电片，所述第一柔性导电片的两端分别与相邻两所述卷绕电芯的正极极耳相连接，且所述第一柔性导电片的中间部分能够弯折；
至少一个第二柔性导电片，所述第二柔性导电片的两端分别与相邻两所述卷绕电芯的负极极耳相连接，且所述第二柔性导电片的中间部分能够弯折。
在本公开的一种示例实施例中，所述正极极耳和所述负极极耳折弯到所述第一侧平面，其中，各所述卷绕电芯的第一侧平面位于同一平面内。
本公开第三方面提供了一种柔性显示装置，其包括上述所述的电池结构。
本公开第四方面提供了一种用于卷绕电芯的热压装置，其包括第一模具和第二模具，所述第一模具和所述第二模具能够相对运动以围成用于热压卷绕电芯的热压型腔，所述热压型腔的内周面与上述任一项所述的卷绕电芯的外周面相匹配。
本公开提供的技术方案可以达到以下有益效果：
本公开的卷绕电芯、电池结构、柔性显示装置及热压装置，通过将卷绕电芯的至少相邻两侧平面的连接处呈倒角设置，可改善此处隔膜与极片之间的界面接触，以降低电池内阻，提高离子电导率，进而提升容量利用率；此外，通过将卷绕电芯的至少相邻两侧平面的连接处呈倒角设置，还可改善电池结构在弯折过程中卷绕电芯拐角处容易出现应力集中的问题，提高产品弯折信赖性和平整度。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能 限制本公开。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本公开的实施例，并与说明书一起用于解释本公开的原理。显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1示出了相关技术中的方形电芯的平面示意图；
图2示出了本公开一实施例所述的卷绕电芯在第一视角下的平面示意图；
图3示出了本公开一实施例所述的卷绕电芯在第二视角下的平面示意图；
图4示出了本公开另一实施例所述的卷绕电芯在第二视角下的平面示意图；
图5示出了本公开又一实施例所述的卷绕电芯在第二视角下的平面示意图；
图6示出了本公开一实施例所述的热压装置的结构示意图；
图7示出了本公开一实施例所述的热压装置未对电芯进行热压时的示意图；
图8示出了本公开一实施例所述的热压装置对电芯热压后的示意图；
图9示出了本公开一实施例所述的电池结构在第一视角下的平面示意图；
图10示出了本公开一实施例所述的电池结构在第二视角下的平面示意图。
附图标记：
a、方形电芯；
10、卷绕电芯；101、第一端面；102、第二端面；103、第一侧平面；104、第二侧平面；105、第三侧平面；106、第四侧平面；107、倒角；108、正极极耳；109、负极极耳；11、第一柔性导电片；12、第二柔性导电片；13、第一模具；130、容纳槽；130a、槽底面；130b、槽侧面；130c、倒角；14、第二模具；140、冲压头；140a、底面；141、滑动安装部；15、导向杆。
具体实施方式
下面通过实施例，并结合附图，对本公开的技术方案作进一步具体的说明。在说明书中，相同或相似的附图标号指示相同或相似的部件。下述参照附图对本公开实施方式的说明旨在对本公开的总体发明构思进行解释，而不应当理解为对本公开的一种限制。
另外，在下面的详细描述中，为便于解释，阐述了许多具体的细节以提供对本披露实施例的全面理解。然而明显地，一个或多个实施例在没有这些具体细节的情况下也可以被实施。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。
本公开中使用的“包括”或者“具有”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。本公开中使用的“连接”或者“相连”等类似的词语不限于物理的或者机械的连接，还可以包括电性的连接，且本公开中使用的“连接”或者“相连”等类似的词语可以是直接连接，也可以是间接连接。
相关技术中，为了使得电池结构能够匹配更多的应用场景，例如：折叠、卷曲等柔性场景，可将多个如图1所示的方形电芯a间隔排布，并采用柔性导电片将多个方形电芯a串联或并联以形成电池结构；其中，柔性导电片中相对方形电芯a悬空的部位能够进行弯折，以实现整个电池结构的弯折。
举例而言，此方形电芯a可为卷绕电芯，具体地，此方形电芯a的制作过程中可为：将正负极片及隔膜进行卷绕形成储能单元，由于卷绕工艺制成的储能单元内部往往比较蓬松，因此，之后需要引入热压工艺，以将卷绕一定圈数的储能单元进行整形，以形成方形电芯a；其中，在热压工艺中，由于热和压力的共同作用可使涂有胶层的隔膜与正负电极片进行粘接，形成良好的界面接触，但热压整形后的方形电芯a容易出现热压死角区域，降低了离子导电率，影响容量发挥。
此外，此方形电芯a与柔性导电片连接以形成电池结构后，在弯折过程中，容易在方形电芯a的拐角位置出现应力集中的问题，极大影响弯折信赖性和平整度。
基于前述提到的问题，本公开实施例提供了一种卷绕电芯10，此卷绕电芯10包括层叠后并卷绕在一起的正极片、负极片和隔膜，此隔膜位于正极片和负极片之间，以实现正极片与负极片之间绝缘；且隔膜涂有胶层，以用于与正极片和负极片粘接。如图2所示，此卷绕电芯10还可包括至少两个极耳，至少两个极耳可包括正极极耳108和负极极耳109，此正极极耳108可采用焊接或铆接等固定方式与正极片连接，但不限于此，正极极耳108与正极片也可为一体裁切而成；负极极耳109可采用焊接或铆接等固定方式与负极片连接，但不限于此，负极极耳109与负极片也可为一体裁切而成。
需要说明的是，本公开的卷绕电芯10通过将堆叠在一起的正极片、负极片和隔膜经卷绕多圈而形成，因此可知，本本公开实施例的卷绕电芯10整体呈刚性，即：卷绕电性整体不易发生弯曲变形。
其中，本公开的卷绕电芯10在卷绕之后进行了整形，以使得隔膜与极片之间形成良好的界面接触，具体地，结合图2和他3所示，整形后的卷绕电芯10可具有在卷绕轴向 Z上相对的第一端面101和第二端面102及位于第一端面101和第二端面102之间的外周面，此外周面可包括依次首尾相连的四个侧平面，如图3所示，且至少相邻两侧平面的连接处呈倒角107设置；通过将至少相邻两侧平面的连接处呈倒角107设置，可改善此处隔膜与极片之间的界面接触，以降低电池内阻，提高离子电导率，进而提升容量利用率。
此外，结合图2和图3所示，本公开实施例的第一端面101和第二端面102中至少一者上凸出设置有极耳，此极耳能够折弯到侧平面处，以与柔性导电片连接，此柔性导电片用于将多个间隔设置的此卷绕电芯10的极耳连接，以组成电池结构，由于本公开实施例中至少相邻两侧平面的连接处呈倒角107设置，因此，还可改善在电池结构弯折过程中柔性导电片与卷绕电芯10拐角处容易出现应力集中的问题，从而可提高产品弯折信赖性和平整度。
可选地，结合图2和图3所示，卷绕电芯10的外周面中四个侧平面可包括与第一参考平面相平行的第一侧平面103和第三侧平面105及与第二参考平面相平行的第二侧平面104和第四侧平面106，第一侧平面103、第二侧平面104、第三侧平面105及第四侧平面106依次首尾相连；也就是说，第一侧平面103、第二侧平面104、第三侧平面105及第四侧平面106中至少相邻两者之间呈倒角107设置。
需要说明的是，本公开实施例的第一参考平面和第二参考平面相互垂直，且并均与前述提到的卷绕轴向Z相平行。
在一实施例中，如图2所示，卷绕电芯10的正极极耳108可凸出设置在第一端面101，而负极极耳109可凸出设置在第二端面102。举例而言，此正极极耳108与负极极耳109可在卷绕轴向Z上正对，但不限于此，正极极耳108与负极极耳109也可错位设置，视具体情况而定。
需要说明的是，第一端面101可凸出设置一个正极极耳108，但不限于此，也可设置两个或以上，视具体情况而定；同理，第二端面102可凸出设置一个负极极耳109，但不限于此，也可设置两个或以上，视具体情况而定。
其中，此正极极耳108和负极极耳109能够折弯到同一侧平面上，例如：均能够弯折到第一侧平面103，但不限于此；正极极耳108和负极极耳109也可弯折到不同侧平面，例如：正极极耳108能够弯折到第一侧平面103，负极极耳109能够弯折到第四侧平面106；或正极极耳108能够弯折到第二侧平面104，负极极耳109能够弯折到第三侧平面105等等。
在本公开的实施例，可将用于与折弯后的正极极耳108和负极极耳109相对的侧平面定义为目标侧平面，此目标侧平面和与其相邻的两侧平面的连接处均呈倒角107设置， 这样设计可进一步改善极片和隔膜之间的界面接触，提高卷绕电芯10形貌，从而可降低电池内阻，提高离子电导率，进而提升容量利用率；此外，通过使目标侧平面和与其相邻的两侧平面的连接处均呈倒角107设置，还可降低多个卷绕电芯10排列难度，以便于连接组成电池结构，此外，还可改善在电池结构弯折过程中柔性导电片与卷绕电芯10拐角处容易出现应力集中的问题，从而可提高产品弯折信赖性和平整度。
举例而言，在正极极耳108和负极极耳109均能够折弯到第一侧平面103时，如图3所示，第一侧平面103与第二侧平面104和第四侧平面106的连接处可呈倒角107设置。此外，如图4所示，第三侧平面105和第二侧平面104和第四侧平面106的连接处也可呈倒角107设置，以提高卷绕电芯10整体形貌精度和电芯容量。
其中，前述提到的倒角107可为弧面倒角或平面倒角，下面对这两种情况进行详细说明。
在本公开的一实施例中，如图3和图4所示，弧面倒角可为圆弧倒角，这样设计在提高电芯整体形貌精度和电芯容量的同时，还可改善在电池结构弯折过程中柔性导电片与卷绕电芯10拐角处容易出现应力集中的问题，提高产品弯折信赖性和平整度。
可选地，如图3和图4所示，此圆弧倒角的半径可为0.4mm至5mm；进一步地，圆弧倒角的半径可为0.5mm至2mm，比如：0.5mm、1mm、1.5mm、2mm等等，经实验表面，在弯折时，柔性导电片与图1中相关技术的方形电芯a的拐角处的最大应力可为3.172e-1Mpa，柔性导电片与本公开实施例的卷绕电芯10中半径为0.5mm的圆弧倒角处的最大应力可为3.05e-1Mpa，柔性导电片与本公开实施例的卷绕电芯10中半径为2mm的圆弧倒角处的最大应力可为2.91e-1Mpa；由此可知，本公开实施例通过将卷绕电芯10中至少相邻两侧平面的连接处设置圆弧倒角，相比于图1中相关技术中方形电芯a，可减小弯折过程中产生的集中应力，从而可提高产品弯折信赖性和平整度。
本公开实施例中，通过将圆弧倒角的半径设计为不小于0.5mm，这样可避免圆弧倒角过小而不能更好地解决应力集中的问题，以提高产品弯折信赖性和平整度；通过将圆弧倒角的半径设计为不大于2mm，这样可避免圆弧倒角过大而导致卷绕电芯10内部容易出现短路的情况，提高产品质量。
在本公开的另一实施例中，如图5所示，倒角107可为平面倒角，此平面倒角在第一参考平面上的正投影的宽度可为第一宽度W1，平面倒角在第二参考平行上的正投影的宽度可为第二宽度W2，此第一宽度W1与第二宽度W2可相等，这样设计可提高卷绕电芯10形貌，从而可降低电池内阻，提高离子电导率，进而提升容量利用率。
可选地，第一宽度W1和第二宽度W2可为0.4mm至5mm，进一步地，第一宽度W1和第二宽度W2可为0.5mm至2mm，比如：0.5mm、1mm、1.5mm、2mm等等，这 样设计一方面可避免平面倒角过小而不能使得电池内阻降低的情况；另一方面可避免平面倒角过大而导致卷绕电芯10内部容易出现短路的情况，提高产品质量。
为了加工出前述提到的至少相邻两侧平面呈倒角107设置的卷绕电芯10，本公开实施例还提供了一种与此卷绕电芯10相匹配的热压装置，如图6所示，此热压装置可包括第一模具13和第二模具14，此第一模具13和第二模具14能够相对运动以围成用于热压卷绕电芯10的热压型腔，此热压型腔的内周面与本公开前述任一实施例的卷绕电芯10的外周面相匹配。
举例而言，如图6所示，此第一模具13的顶部可设置有容纳卷绕电芯10的容纳槽130，此容纳槽130具有槽底面130a和位于槽底面130a相对两侧的槽侧面130b，此槽底面130a与相对两侧槽侧面130b的连接处呈倒角130c；设置；而第二模具14可包括冲压头140，在第二模具14向靠近第一模具13的方向运动时，冲压头140可伸入此容纳槽130中，且冲压头140的底面140a与槽底面130a和两槽侧面130b可围成前述提到的热压型腔。
需要说明的是，此槽底面130a、槽侧面130b及冲压头140的底面140a可与前述提到的卷绕电芯10的四个侧平面相匹配，即：均呈平面设计；此槽底面130a与槽侧面130b连接处的倒角130c可与前述提到的卷绕电芯10的倒角107相匹配，即：在所需卷绕电芯10的倒角107为圆弧倒角时，槽底面130a与槽侧面130b连接处的倒角130c也可为圆弧倒角；在所需卷绕电芯10的倒角107为平面倒角时，槽底面130a与槽侧面130b连接处的倒角130c也可为平面倒角。
在本公开的一实施例中，卷绕电芯10中与槽底面130a相对的侧平面可为前述提到的第一侧平面103，其中，在采用此热压装置将卷绕后的电芯热压成型后，可将正极极耳108和负极极耳109弯折到第一侧平面103上，以便于柔性导电片将各卷绕电芯10的极耳连接，以形成电池结构。
如图6所示，热压装置还可包括至少两个导向杆15，第二模具14还可包括设置在冲压头140顶部的滑动安装部141，此滑动安装部141可与各导向杆15滑动连接，并沿着此导向杆15向靠近或远离第一模具13的方向移动，通过设置导向杆15可保证第二模具14的运动轨迹，从而可保证热压成型质量。
此外，热压装置还可包括与第二模具14连接的驱动结构(图中未示出)，此驱动结构可驱动第二模具14向靠近或远离第一模具13的方向移动。
举例而言，如图7所示，在热压过程中，可先将卷绕后的电芯b放置在第一模具13的容纳槽130内；然后，驱动第二模具14向靠近第一模具13的方向移动，此第二模具14的冲压头140与容纳槽130相配合以将容纳槽130内的电芯b热压成如图8所示的卷 绕电芯10。
基于前述内容，采用本公开实施例的热压装置加工出的卷绕电芯10相比于相关技术中采用常规热压成型的方形电芯a，可有效改善卷芯宽厚比较大、尺寸不可控、孔隙不均匀等问题，同时在保证电池容量条件下，进一步提升了电池的倍率性能。
本公开实施例还提供了一种电池结构，其包括至少两个前述任一实施例所描述的卷绕电芯10，如图9和图10所示，此卷绕电芯10的正极极耳108和负极极耳109折弯到目标侧平面，其中，至少两个卷绕电芯10在水平方向X上间隔排布，此水平方向X与卷绕轴向Z相垂直。
此外，如图9和图10所示，电池结构还可包括至少一个第一柔性导电片11和至少一个第二柔性导电片12，此第一柔性导电片11的两端分别与相邻两卷绕电芯10的正极极耳108相连接，举例而言，第一柔性导电片11的两端可采用焊接等方式与相邻两卷绕电芯10的正极极耳108连接；其中，由于相邻两卷绕电芯10在水平方向X上间隔排布，因此可知，第一柔性导电片11的中间部分相对卷绕电芯10悬空设置，此第一柔性导电片11的中间部分能够弯折；而第二柔性导电片12的两端分别与相邻两卷绕电芯10的负极极耳109相连接，举例而言，第二柔性导电片12的两端可采用焊接等方式与相邻两卷绕电芯10的正极极耳108连接；其中，由于相邻两卷绕电芯10在水平方向X上间隔排布，因此可知，第二柔性导电片12的中间部分相对卷绕电芯10悬空设置，且第二柔性导电片12的中间部分能够弯折。
在本公开的实施例中，电池结构可沿着第一柔性导电片11和第二柔性导电片12的中间部分弯折，以实现电池结构的弯折；也就是说，本公开实施例的电池结构可进行弯折，此电池结构可应用与柔性显示装置等电子产品中。
其中，由于前述提到卷绕电芯10的目标侧平面和与其相邻的两侧平面的连接处均呈倒角107设置，因此，在弯折过程中可改善柔性导电片与卷绕电芯10拐角处容易出现应力集中的问题，从而可提高产品弯折信赖性和平整度。
可选地，卷绕电芯10的正极极耳108和负极极耳109折弯到卷绕电芯10的第一侧平面103，其中，各卷绕电芯10的第一侧平面103位于同一平面内，这样设计便于柔性导电片与相邻卷绕电芯10连接，以及还可保证在未弯折时柔性导电片与卷绕电芯10的连接稳定性；此外，还可保证整个电池结构的平整性，便于电池结构与整机进行装配。
本公开实施例还提供了一种柔性显示装置，其包括前述任一实施例所描述的电池结构；应当理解的是，柔性显示装置还可包括柔性显示面板，此柔性显示面板的可弯折区可与电池结构中柔性导电片的中间部位相对应，以能够实现柔性显示装置的整体弯折。
需要说明的是，该柔性显示装置除了前述提到的柔性显示面板和电池结构以外，还 可包括其他部件和组成，例如电路板、壳体等等，本领域善解人意可根据该柔性显示装置的具体使用要求进行相应地补充，在此不再赘述。
在本公开的实施例中，柔性显示装置的具体类型不受特别的限制，本领域常用的柔性显示装置类型均可，具体例如电视、手机、电脑、医疗设备等等，本领域技术人员可根据该柔性显示装置的具体用途进行相应地选择，在此不再赘述。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本公开的其它实施方案。本公开旨在涵盖本公开的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本公开的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本公开的真正范围和精神由所附的权利要求指出。

Claims (14)

  1. 一种卷绕电芯，其中，所述卷绕电芯具有在卷绕轴向上相对的第一端面和第二端面及位于所述第一端面和所述第二端面之间的外周面，所述外周面包括依次首尾相连的四个侧平面，且至少相邻两侧平面的连接处呈倒角设置；其中，所述第一端面和所述第二端面中至少一者上凸出设置有极耳，所述极耳能够折弯到所述侧平面处。
  2. 根据权利要求1所述的卷绕电芯，其中，所述四个侧平面包括与第一参考平面相平行的第一侧平面和第三侧平面及与第二参考平面相平行的第二侧平面和第四侧平面，所述第一侧平面、所述第二侧平面、所述第三侧平面及所述第四侧平面依次首尾相连；其中，所述第一参考平面和所述第二参考平面相互垂直，并均与所述卷绕轴向相平行。
  3. 根据权利要求2所述的卷绕电芯，其中，所述倒角为弧面倒角或平面倒角。
  4. 根据权利要求3所述的卷绕电芯，其中，所述弧面倒角为圆弧倒角。
  5. 根据权利要求4所述的卷绕电芯，其中，所述圆弧倒角的半径为0.4mm至5mm。
  6. 根据权利要求3所述的卷绕电芯，其中，
    所述倒角为平面倒角，所述平面倒角在所述第一参考平面上的正投影的宽度为第一宽度，所述平面倒角在所述第二参考平行上的正投影的宽度为第二宽度，所述第一宽度与所述第二宽度相等。
  7. 根据权利要求6所述的卷绕电芯，其中，所述第一宽度和所述第二宽度为0.4mm至5mm。
  8. 根据权利要求2至7中任一项所述的卷绕电芯，其中，
    所述极耳设置至少两个，至少两个包括正极极耳和负极极耳，所述正极极耳凸出设置在所述第一端面，所述负极极耳凸出设置在所述第二端面；
    所述正极极耳和所述负极极耳能够折弯到同一所述侧平面上或分别折弯到不同所述侧平面上；
    其中，用于与折弯后的所述正极极耳和所述负极极耳相对的侧平面为目标侧平面，所述目标侧平面和与其相邻的两侧平面的连接处均呈倒角设置。
  9. 根据权利要求8所述的卷绕电芯，其中，所述正极极耳和所述负极极耳能够折弯到所述第一侧平面，所述第一侧平面与所述第二侧平面和所述第四侧平面的连接处呈倒角设置。
  10. 根据权利要求9所述的卷绕电芯，其中，所述第三侧平面和所述第二侧 平面和所述第四侧平面的连接处呈倒角设置。
  11. 一种电池结构，用于柔性显示装置，其中，包括：
    至少两个在水平方向上间隔排布的卷绕电芯，所述卷绕电芯为如权利要求8至10中任一项所述的卷绕电芯，且所述卷绕电芯的正极极耳和负极极耳折弯到所述目标侧平面，且所述水平方向与所述卷绕轴向相垂直；
    至少一个第一柔性导电片，所述第一柔性导电片的两端分别与相邻两所述卷绕电芯的正极极耳相连接，且所述第一柔性导电片的中间部分能够弯折；
    至少一个第二柔性导电片，所述第二柔性导电片的两端分别与相邻两所述卷绕电芯的负极极耳相连接，且所述第二柔性导电片的中间部分能够弯折。
  12. 根据权利要求11所述的电池结构，其中，所述正极极耳和所述负极极耳折弯到所述第一侧平面，其中，各所述卷绕电芯的第一侧平面位于同一平面内。
  13. 一种柔性显示装置，其中，包括权利要求11或12所述的电池结构。
  14. 一种用于卷绕电芯的热压装置，其中，包括第一模具和第二模具，所述第一模具和所述第二模具能够相对运动以围成用于热压卷绕电芯的热压型腔，所述热压型腔的内周面与权利要求1至10中任一项所述的卷绕电芯的外周面相匹配。
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