Cell structure, battery, and energy storage device

Abstract

A cell structure (100), comprising: an anode plate (110), a diaphragm (120) and a cathode plate (130), which are arranged in a winding manner, wherein the cell structure (100) has a pre-wound structure (102) at the center, and the pre-wound structure (102) is formed by the anode plate (110) and the diaphragm (120) pre-winding a preset length that is 3 mm to 200 mm; an adhesive tape (140) is attached to the head of the anode plate (110); and the head of the cathode plate (130) is arranged corresponding to the position of the diaphragm (120) of the pre-wound structure (102) after being wound the preset length.

Description

Cell structure, battery and energy storage device

[0001] This application claims priority to Chinese patent application number 2023216945208, filed on June 30, 2023, entitled “Battery Cell Structure, Battery and Energy Storage Device,” the entire text of which is hereby incorporated by reference. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery cell structure, a battery, and an energy storage device. Background Art

[0003] A wound cell is a battery structure formed by winding a stacked structure of separator, anode plate, separator, cathode plate, or anode plate, separator, cathode plate, and separator. However, this winding method creates a void in the center of the cell structure. The inner core (interior) of the cell near the void is prone to collapse after infiltration, resulting in black spots and lithium deposition.

[0004] Summary of the Invention

[0005] Based on this, it is necessary to provide a battery cell structure, a battery and an energy storage device to address the problem that the inner core (interior) of the battery cell structure is prone to collapse after being infiltrated.

[0006] A battery cell structure comprising: an anode electrode sheet, a separator and a cathode electrode sheet which are wound together;

[0007] The center of the battery cell structure has a pre-rolled structure, and the pre-rolled structure is formed by pre-winding the anode electrode and the separator to a preset length, wherein the preset length is 3 mm to 200 mm;

[0008] The head of the anode electrode is affixed with adhesive tape;

[0009] The head of the cathode electrode piece is arranged to correspond to the position of the diaphragm of the pre-rolled structure after being wound to the preset length.

[0010] A battery cell structure comprises: an anode plate, a separator and a cathode plate which are wound together, wherein the head of the anode plate is located inside the head of the cathode plate, the head of the anode plate, the head of the separator and the head of the cathode plate are wound together, and the heads of the anode plate and the cathode plate are both covered with adhesive tape.

[0011] A battery cell structure comprises: an anode plate, a separator and a cathode plate which are wound together, wherein the head of the anode plate is located inside the head of the cathode plate and between the two separators;

[0012] The head of the cathode electrode is covered with adhesive tape, and the adhesive tape on the head of the cathode electrode is extended inward along the circumferential direction to form the first layer of the battery cell structure in the direction from the inside to the outside.

[0013] A battery comprises: a shell and a battery core structure, wherein the battery core structure is arranged in the shell and the battery core structure is any one of the battery core structures described above.

[0014] An energy storage device comprises the above-mentioned battery.

[0015] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to better describe and illustrate the embodiments and / or examples of the applications disclosed herein, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the accompanying drawings should not be considered to limit the scope of the disclosed applications, the presently described embodiments and / or examples, and any of the best modes currently understood for these applications.

[0017] FIG1 is a schematic structural diagram of a battery cell structure in the first embodiment of the present application.

[0018] FIG2 is a schematic structural diagram of a battery cell structure in a second embodiment of the present application.

[0019] FIG3 is a schematic structural diagram of a battery cell structure in a third embodiment of the present application.

[0020] FIG4 is a schematic structural diagram of a battery cell structure in a fourth embodiment of the present application.

[0021] FIG5 is a schematic structural diagram of a battery cell structure in the fifth embodiment of the present application.

[0022] FIG6 is a schematic structural diagram of a battery cell structure in a sixth embodiment of the present application.

[0023] FIG7 is a schematic structural diagram of a battery cell structure in the seventh embodiment of the present application.

[0024] FIG8 is a schematic structural diagram of a battery cell structure in the eighth embodiment of the present application.

[0025] FIG9 is a schematic structural diagram of a battery cell structure in a ninth embodiment of the present application.

[0026] FIG10 is a projection view of a battery in one embodiment of the present application. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0028] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0029] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0030] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0033] Please refer to Figure 1, which shows a schematic structural diagram of the battery cell structure in the first embodiment of the present application. The battery cell structure 100 provided in the first embodiment of the present application includes a wound anode electrode sheet 110, a separator 120, and a cathode electrode sheet 130. The center of the battery cell structure 100 has a pre-rolled structure 102, which is formed by pre-winding the anode electrode sheet 110 and the separator 120 to a preset length, wherein the preset length is 3mm to 200mm. The head of the anode electrode sheet 110 is affixed with adhesive tape 140. The head of the cathode electrode sheet 130 is arranged at a position corresponding to the position of the separator 120 of the pre-rolled structure 102 after being wound to a preset length.

[0034] By setting the adhesive tape 140 at the head of the anode electrode 110, the structural strength of the head is improved, and the cathode electrode 130 is inserted only after the anode electrode 110 and the diaphragm 120 are pre-wound to form the pre-wound structure 102, and all the electrodes and the diaphragm 120 are wound together, which is beneficial to reducing the gap in the center of the battery cell structure 100. Therefore, under the joint action of the adhesive tape 140 and the pre-wound structure 102, the risk of collapse of the inner core of the battery cell structure 100 is effectively reduced, and the black spots and lithium deposition conditions are improved; moreover, the cutting position is formed on the adhesive tape 140, compared with directly cutting the electrode, it reduces or avoids the phenomenon of powder loss and burrs, which plays a great protective role in the safety of the battery cell structure 100 and the excellent rate of the voltage withstand test (HIpot test).

[0035] In this embodiment, the preset length is 80 mm, that is, the anode electrode piece 110 and the separator 120 are pre-wound 80 mm to form the pre-wound structure 102. The head of the cathode electrode piece 130 is set to the position after the separator 120 is pre-wound 80 mm. It is understood that in other embodiments, the preset length can be 3 mm, 50 mm, 100 mm, 150 mm, or 200 mm, that is, the anode electrode piece 110 and the separator 120 are pre-wound to a length of 3 mm, 50 mm, 100 mm, 150 mm, or 200 mm to form the pre-wound structure 102, and the head of the cathode electrode piece 130 is set to the position after the separator 120 is pre-wound 3 mm, 50 mm, 100 mm, 150 mm, or 200 mm.

[0036] In this embodiment, the tail of the anode pole piece 110 is also affixed with adhesive tape 140. Moreover, the front side of the head and tail of the anode pole piece 110 are both affixed with adhesive tape 140, and the back side of the head and tail of the anode pole piece 110 are also affixed with adhesive tape 140. In the position where there is no pole piece, the adhesive tape 140 on the front side and the adhesive tape 140 on the back side are affixed to each other. The double-sided adhesive tape setting of the anode pole piece 110 can further enhance the structural strength of the head of the anode pole piece 110 and further reduce the risk of inner core collapse. It should be noted that the above-mentioned "front side" refers to the inner side of the pole piece in the direction from the inside to the outside, and the "back side" refers to the outer side of the pole piece in the direction from the inside to the outside. It is understandable that in other embodiments, the tail of the anode pole piece 110 may not be provided with adhesive tape 140 to save material; or, the adhesive tape 140 may be provided only on the front or back side of the anode pole piece 110 to save material and reduce thickness.

[0037] In this embodiment, the adhesive tape 140 may include an adhesive layer and an adhesive layer stacked in sequence, and the adhesive layer may include one or more of ethylene-vinyl acetate copolymer, polycarbonate, polylactic acid and other polymer materials.

[0038] In this embodiment, the first layer of the battery cell structure 100 in the direction from the inside to the outside is the anode electrode 110, that is, the battery cell structure 100 adopts an arrangement scheme of anode electrode sheet-diaphragm-cathode electrode sheet-diaphragm from the inside to the outside, wherein the cathode electrode sheet is staggered and wound.

[0039] Furthermore, the tail of the anode electrode piece 110 extends outwardly circumferentially from the tail of the cathode electrode piece 130, and the extension length of the anode electrode piece 110 relative to the tail of the cathode electrode piece 130 is 2 mm to 50 mm, so that the tail of the anode electrode piece 110 can cover the tail of the cathode electrode piece 130, avoiding the tail position of the cathode electrode piece 130 not being covered by the corresponding anode electrode piece 110, which may cause black spots and lithium deposition. In this embodiment, the anode electrode piece 110 extends outwardly from the tail of the cathode electrode piece 130 by 20 mm, but is not limited to this extension length. In other embodiments, the extension length may be 2 mm, 10 mm, 30 mm, 40 mm, or 50 mm.

[0040] In this embodiment, the diaphragm 120 between the anode electrode 110 and the cathode electrode 130 is extended outward along the circumferential direction to form the last layer of the battery cell structure 100 in the direction from the inside to the outside, and then a double-layer diaphragm 120 is formed on the outside of the battery cell structure 100, which plays a role in protecting the outside of the battery cell structure 100.

[0041] In this embodiment, whether it is the pre-winding of the anode electrode 110 and the separator 120, or the co-winding after the insertion of the cathode electrode 130, a continuous winding method is adopted, that is, the entire winding process is uninterrupted until the battery cell structure 100 is wound into shape. The continuous winding method can increase the winding speed of the winding machine, which is conducive to improving production efficiency. During continuous winding, the tail of the entire battery cell structure 100 is cut with tension, which reduces the tail of the electrode and the lack of tension at the tail of the electrode, and avoids the resulting insufficient tension and loose fit of the battery cell structure 100, further improving the problems of black spots and lithium precipitation.

[0042] In this embodiment, the anode sheet 110 is taped as follows: the unwound anode sheet 110 is first cut, then unwound, and finally, adhesive tape 140 is affixed to the leading and trailing ends of the anode sheet 110. The wound anode sheet 110 and separator 120 are cut together, with the cutting position located on the adhesive tape 140 to avoid directly cutting the anode sheet.

[0043] It should be noted that, based on the maximum radial thickness of the battery cell structure 100 , the actual number of layers of the battery cell structure 100 ranges from 10 to 100 layers, not the few layers shown in FIG1 . FIG1 and other accompanying drawings are only schematic diagrams for clarity of features and cannot represent actual conditions.

[0044] Please refer to Figure 2, which shows a structural schematic diagram of the battery cell structure in the second embodiment of the present application. On the basis of the battery cell structure 100 in the above-mentioned first embodiment, the battery cell structure 100 in this embodiment is additionally provided with a finishing glue 150. The finishing glue 150 is affixed to the tail of the diaphragm 120, and it covers the outer side surface of the battery cell structure 100 along the circumferential direction, thereby completing the side gluing of the battery cell structure 100, sealing the tail of the battery cell structure 100, and preventing the battery cell structure 100 from loosening from its tail.

[0045] In this embodiment, the finishing glue 150 is a short glue, and its length can be determined according to actual conditions, and it can cover the tail of the battery cell structure 100 from the side.

[0046] As for other aspects of the battery cell structure 100 in this embodiment, they are basically the same as those in the first embodiment. For details, please refer to the description of the first embodiment and will not be repeated here.

[0047] Please refer to Figure 3, which shows a schematic diagram of the structure of the battery cell structure in the third embodiment of the present application. Compared to the battery cell structure 100 in the second embodiment, the end cap 150 of the battery cell structure 100 in this embodiment uses a long rubber. It covers the entire outer surface of the battery cell structure 100 along the circumferential direction, that is, it is arranged in a circle and the rubber is applied in a full circle, forming a surrounding rubber. Obviously, the starting and ending positions of the end cap 150 are not restricted, so the starting area, ending area, and overlapping area are marked on it.

[0048] As for other aspects of the battery cell structure 100 in this embodiment, they are basically the same as those in the second embodiment. For details, please refer to the description of the second embodiment, and no further details will be given here.

[0049] Please refer to Figure 4, which shows a schematic structural diagram of the battery cell structure in the fourth embodiment of the present application. Compared with the battery cell structure 100 in the first embodiment, the battery cell structure 100 in this embodiment adopts an arrangement scheme of diaphragm-anode pole piece-diaphragm-cathode pole piece from the inside to the outside, that is, the first layer of the battery cell structure 100 in the direction from the inside to the outside is the diaphragm 120. The diaphragm 120 plays a certain supporting role for the anode pole piece 110, further reducing the risk of collapse of the inner core of the battery cell structure 100, and can avoid the phenomenon of the anode pole piece 110 scraping off powder when the inner core is pulled out. Moreover, the diaphragm 120 between the anode pole piece 110 and the cathode pole piece 130 will not be extended outward along the circumferential direction. It is understandable that in other embodiments, the diaphragm 120 between the anode pole piece 110 and the cathode pole piece 130 can be extended, and its extended section forms the last layer of the battery cell structure 100 in the direction from the inside to the outside, thereby forming a double-layer diaphragm 120 on the outside of the battery cell structure 100.

[0050] As for other aspects of the battery cell structure 100 in this embodiment, they are basically the same as those in the first embodiment. For details, please refer to the description of the first embodiment and will not be repeated here.

[0051] Please refer to Figure 5, which shows a schematic structural diagram of a battery cell structure in the fifth embodiment of the present application. The battery cell structure 100 provided in the fifth embodiment of the present application includes a wound anode electrode sheet 110, a separator 120, and a cathode electrode sheet 130. The head of the anode electrode sheet 110 is located inside the head of the cathode electrode sheet 130. The heads of the anode electrode sheet 110, the separator 120, and the cathode electrode sheet 130 are wound together, and the heads of the anode electrode sheet 110 and the cathode electrode sheet 130 are both covered with adhesive tape 140.

[0052] By setting adhesive tape 140 on the head of the anode electrode 110 and setting adhesive tape 140 on the head of the cathode electrode 130, the head of the anode electrode 110, the head of the diaphragm 120 and the head of the cathode electrode 130 are wound together to form the inner core (interior) of the battery cell structure 100. The adhesive tape 140 on the head of the anode electrode 110 and the adhesive tape 140 on the head of the cathode electrode 130 jointly improve the structural strength of the inner core of the battery cell structure 100, effectively reduce the risk of collapse of the inner core of the battery cell structure 100, and improve the black spots and lithium deposition. Moreover, the cutting position is formed on the adhesive tape 140. Compared with directly cutting the electrode, it reduces or avoids the phenomenon of powder loss and burrs, which plays a great protective role in the safety of the battery cell structure 100 and the excellent rate of the voltage withstand test (HIpot test).

[0053] In this embodiment, the tails of the anode electrode 110 and the cathode electrode 130 are both affixed with adhesive tape 140. Moreover, the front sides of the head and tail of the anode electrode 110 are both affixed with adhesive tape 140, and the back sides of the head and tail of the anode electrode 110 are also affixed with adhesive tape 140. In the position where there is no electrode, the adhesive tape 140 on the front side and the adhesive tape 140 on the back side are affixed to each other. The front sides of the head and tail of the cathode electrode 130 are both affixed with adhesive tape 140, and the back sides of the head and tail of the cathode electrode 130 are also affixed with adhesive tape 140. In the position where there is no electrode, the adhesive tape 140 on the front side and the adhesive tape 140 on the back side are affixed to each other. The double-sided adhesive tape 140 is provided to further enhance the structural strength of the end of the electrode and further reduce the risk of collapse of the inner core. It should be noted that the above-mentioned "front side" refers to the inner side of the electrode in the direction from the inside to the outside, and the "back side" refers to the outer side of the electrode in the direction from the inside to the outside. It is understandable that in other embodiments, the adhesive tape 140 can be set only on the front or back of the anode electrode 110 and the cathode electrode 130 to save material and reduce thickness; or, according to actual needs, the adhesive tape 140 can be selectively set at the tail of the anode electrode 110 and the cathode electrode 130.

[0054] In this embodiment, the adhesive tape 140 may include an adhesive layer and an adhesive layer stacked in sequence, and the adhesive layer may include one or more of ethylene-vinyl acetate copolymer, polycarbonate, polylactic acid and other polymer materials.

[0055] In this embodiment, the first layer of the cell structure 100 from the inside out is the anode electrode 110. The adhesive tape 140 on the tail of the cathode electrode 130 and the outer separator 120 extend outward along the circumferential direction, with the extended section 142 of the separator 120 forming the last layer of the cell structure 100. The extended section 142 of the separator 120 and the extended section 142 of the adhesive tape 140 can jointly protect the exterior of the cell structure 100, reducing the probability of the exterior of the cell structure 100 being punctured and improving the safety of the cell structure 100.

[0056] In this embodiment, the battery cell structure 100 adopts an arrangement scheme of anode electrode sheet-diaphragm-cathode electrode sheet-diaphragm from the inside out, wherein all the electrode sheets and the diaphragm 120 are wound at the same time, there is no staggered winding, and a continuous winding method is adopted, and the entire winding process is uninterrupted until the battery cell structure 100 is wound into shape. The continuous winding method can increase the winding speed of the winding machine, which is conducive to improving production efficiency. During continuous winding, the tail of the entire battery cell structure 100 is cut with tension, which reduces the tail of the electrode sheet and the lack of tension at the tail of the electrode sheet, avoids the resulting insufficient tension and loose fit of the battery cell structure 100, and further improves the problems of black spots and lithium precipitation.

[0057] Furthermore, the tail of the anode electrode piece 110 extends outwardly circumferentially from the tail of the cathode electrode piece 130, and the extension length of the anode electrode piece 110 relative to the tail of the cathode electrode piece 130 is 2 mm to 50 mm, so that the tail of the anode electrode piece 110 can cover the tail of the cathode electrode piece 130, avoiding the tail position of the cathode electrode piece 130 not being covered by the corresponding anode electrode piece 110, which may cause black spots and lithium deposition. In this embodiment, the anode electrode piece 110 extends outwardly from the tail of the cathode electrode piece 130 by 20 mm, but is not limited to this extension length. In other embodiments, the extension length may be 2 mm, 10 mm, 30 mm, 40 mm, or 50 mm.

[0058] The specific method of forming the extended section 142 of the double-layer adhesive tape 140 on the battery cell structure 100 is as follows: the electrode is first cut after unwinding, the distance of the cutting edge is stretched, for example 1mm to 500mm, and the head and tail are double-sidedly taped; then, when winding into a battery cell, it is cut at the place where the front and back adhesive tapes are pasted, so that the electrode with adhesive tapes on both the head and tail and the longer adhesive tape section can be obtained.

[0059] Please refer to Figure 6, which shows a schematic diagram of the structure of the battery cell structure in the sixth embodiment of the present application. Compared to the battery cell structure 100 in the fifth embodiment described above, the head of the anode electrode sheet 110 of the battery cell structure 100 in this embodiment is located between two separators 120, forming a separator-anode electrode sheet-separator-cathode electrode sheet arrangement. Among them, the adhesive tape 140 on the head of the cathode electrode sheet 130 is extended inward along the circumferential direction, forming the first layer of the battery cell structure 100 in the direction from the inside to the outside. By arranging the extension section 142 of the adhesive tape 140 on the inner core, a certain structural support force is provided, which can prevent the collapse and separation of the inner core electrode sheet of the battery cell structure 100, resulting in black spots and lithium precipitation, and can also prevent the separator 120 from being scratched and the anode electrode sheet from being scraped and powdered when winding and removing the needle. However, in this embodiment, the adhesive tape 140 on the tail of the cathode electrode sheet 130 and the separator 120 on its outer side are not extended outward along the circumferential direction.

[0060] As for other aspects of the battery cell structure 100 in this embodiment, they are basically the same as those in the fifth embodiment. For specific details, reference may be made to the description of the fifth embodiment, and no further details will be given here.

[0061] Please refer to FIG7 , which shows a schematic diagram of the structure of the battery cell structure in the seventh embodiment of the present application. On the basis of the sixth embodiment described above, the adhesive tape 140 on the head of the anode electrode 110 and the adhesive tape 140 on the outside thereof are extended inwardly along the circumferential direction. That is, the adhesive tape 140 on the head of the anode electrode 110, the adhesive tape 140 on the head of the cathode electrode 130, and the diaphragm 120 therebetween are extended inwardly along the circumferential direction, and the extended section 142 of the adhesive tape 140 on the anode electrode 110 forms the first layer of the battery cell structure 100 in the direction from the inside to the outside. By arranging two extended sections 142 of the adhesive tape 140 on the inner core, better structural support is provided, which can prevent the collapse and separation of the inner core electrode of the battery cell structure 100, resulting in black spots and lithium precipitation, and can also prevent the diaphragm 120 from being scratched and the anode electrode from being scratched and powder falling off when winding and pulling out the needle. The adhesive tape 140 on the tail of the cathode electrode 130 and the outer separator 120 extend outwardly along the circumference, with the extended section 142 of the separator 120 forming the final layer of the cell structure 100. The extended section 142 of the adhesive tape 140 and the extended section 142 of the separator 120 protect the exterior of the cell structure 100, reducing the probability of the exterior of the cell structure 100 being punctured and improving the safety of the cell structure 100.

[0062] It is understandable that in other embodiments, the battery cell structure 100 may only extend the adhesive tape 140 on the tail of the anode electrode 110, the adhesive tape 140 on the tail of the cathode electrode 130, and the diaphragm 120 therebetween inward, without extending the adhesive tape 140 on the tail of the cathode electrode 130 and the diaphragm 120 on its outside outward.

[0063] As for other aspects of the battery cell structure 100 in this embodiment, they are basically the same as those in the sixth embodiment. For specific details, please refer to the description of the sixth embodiment, and no further details will be given here.

[0064] Please refer to Figure 8, which shows a schematic diagram of the structure of a battery cell structure in an eighth embodiment of the present application. Compared to the battery cell structure 100 in the sixth embodiment, the battery cell structure 100 in this embodiment is provided with adhesive tape 140 only on the head of the cathode electrode piece 130, and is not provided on the anode electrode piece 110. Moreover, the adhesive tape 140 on the head of the cathode electrode piece 130 is extended inward along the circumferential direction, forming the first layer of the battery cell structure 100 in the direction from the inside to the outside. By setting the adhesive tape 140 on the head of the cathode electrode 130, the extended section 142 of the adhesive tape 140 improves the structural strength of the inner core (interior) of the battery cell structure 100, and the extended section 142 of the adhesive tape 140 is formed on the inner core, which effectively reduces the risk of collapse of the inner core of the battery cell structure 100 and improves the black spots and lithium deposition conditions; moreover, the cutting position is formed on the adhesive tape 140, compared with directly cutting the electrode, it reduces or avoids the phenomenon of powder loss and burrs, and plays a great protective role in the safety of the battery cell structure 100 and the excellent rate of the voltage test (HIpot test).

[0065] In this embodiment, a tape 140 is also provided at the tail of the cathode electrode 130 , and the tape 140 is also attached to both the front and back surfaces of the cathode electrode 130 .

[0066] As for other aspects of the battery cell structure 100 in this embodiment, they are basically the same as those in the sixth embodiment. For specific details, please refer to the description of the sixth embodiment, and no further details will be given here.

[0067] Please refer to FIG9 , which shows a schematic structural diagram of a cell structure in a ninth embodiment of the present application. Compared to the cell structure 100 in the eighth embodiment, the first layer of the cell structure 100 in this embodiment, from the inside out, is the anode electrode 110. The adhesive tape 140 on the head of the cathode electrode 130 is not extended. Instead, the adhesive tape 140 on the tail of the cathode electrode 130 and the diaphragm 120 on its outside are extended outwardly along the circumferential direction, with the extended section 142 of the diaphragm 120 forming the last layer of the cell structure 100. The extended section 142 of the adhesive tape 140 and the extended section 142 of the diaphragm 120 can jointly protect the exterior of the cell structure 100, reduce the probability of the exterior of the cell structure 100 being punctured, and improve the safety of the cell structure 100.

[0068] Please refer to Figure 10, which shows a projection view of a battery in one embodiment of the present application. The battery 200 provided in one embodiment of the present application includes a housing 210 and a cell structure 100, with the cell structure 100 disposed within the housing 210. The specific structure of the cell structure 100 is similar to that of the above embodiments. Since the battery 200 of this embodiment adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be detailed here.

[0069] The present application also provides an energy storage device. Referring to FIG10 , in one embodiment, the energy storage device includes a battery 200. The specific structure of the battery 200 is similar to that of the above-described embodiments. Since the energy storage device of this embodiment utilizes all the technical solutions of all the above-described embodiments, it also has all the beneficial effects brought about by the technical solutions of the above-described embodiments, and therefore will not be described in detail here.

[0070] It should be noted that the energy storage device may be, but is not limited to, a battery module, a battery cluster, an energy storage cabinet, or other energy storage equipment. When the energy storage device is a battery module, it may include a mounting structure and multiple batteries 200 disposed on the mounting structure. When the energy storage device is a battery cluster, it may include a housing and a battery module disposed within the housing, wherein the battery module includes multiple batteries 200. When the energy storage device is an energy storage cabinet, it may include a cabinet and a battery cluster disposed within the cabinet, wherein the battery cluster includes a battery module, and the battery module includes multiple batteries 200.

[0071] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery cell structure, comprising: The anode electrode sheet, the separator and the cathode electrode sheet are wound and arranged, characterized in that: The center of the battery core structure has a pre-rolled structure, and the pre-rolled structure is formed by pre-winding the anode electrode sheet and the separator to a preset length, wherein the preset length is 3 mm to 200 mm; The head of the anode electrode sheet is pasted with adhesive tape; The head of the cathode electrode piece is arranged to correspond to the position of the diaphragm of the pre-rolled structure after being wound to the preset length.

2. The battery cell structure according to claim 1, characterized in that: The first layer of the battery core structure from the inside to the outside is the separator.

3. The battery core structure according to claim 1 or 2, characterized in that: The tail of the anode pole piece is extended outwardly from the tail of the cathode pole piece in the circumferential direction, and the extended length of the anode pole piece relative to the tail of the cathode pole piece is 2 mm to 50 mm.

4. The battery core structure according to claim 1 or 2, characterized in that: The diaphragm between the anode electrode sheet and the cathode electrode sheet is extended outwardly along the circumferential direction to form the last layer of the battery cell structure in the direction from the inside to the outside.

5. A battery cell structure, comprising: The anode electrode sheet, the separator and the cathode electrode sheet are wound and arranged, characterized in that: The head of the anode electrode sheet is located inside the head of the cathode electrode sheet. The head of the anode electrode sheet, the head of the diaphragm and the head of the cathode electrode sheet are wound together, and the head of the anode electrode sheet and the head of the cathode electrode sheet are both covered with adhesive tape.

6. The battery cell structure according to claim 5, characterized in that: The tail of the anode pole piece is extended outwardly from the tail of the cathode pole piece in the circumferential direction, and the extended length of the anode pole piece relative to the tail of the cathode pole piece is 2 mm to 50 mm.

7. The battery core structure according to claim 5 or 6, characterized in that: The first layer of the battery cell structure from the inside to the outside is the anode electrode sheet, and the tail of the cathode electrode sheet is pasted with adhesive tape. The adhesive tape on the tail of the cathode electrode sheet and the diaphragm outside thereof are circumferentially The two membranes are extended outward together so that the extended section of the membrane forms the last layer of the battery core structure; The head of the anode electrode piece is located between the two diaphragms, and the adhesive tape on the head of the cathode electrode piece is extended inwardly along the circumferential direction to form the first layer of the battery cell structure in the direction from the inside to the outside; or The head of the anode electrode sheet is located between the two diaphragms, and the adhesive tape on the head of the anode electrode sheet, the adhesive tape on the head of the cathode electrode sheet and the diaphragm therebetween are extended inwardly along the circumferential direction, so that the extended section of the adhesive tape on the anode electrode sheet forms the first layer of the battery cell structure in the direction from the inside to the outside; the tail of the cathode electrode sheet is affixed with adhesive tape, and the adhesive tape on the tail of the cathode electrode sheet and the diaphragm on its outside are extended outwardly along the circumferential direction, so that the extended section of the diaphragm forms the last layer of the battery cell structure.

8. A battery cell structure, comprising: The anode electrode sheet, the separator and the cathode electrode sheet are wound and arranged, characterized in that: The head of the anode electrode piece is located inside the head of the cathode electrode piece and between the two diaphragms; The head of the cathode electrode piece is covered with adhesive tape, and the adhesive tape on the head of the cathode electrode piece is extended inwardly along the circumferential direction to form the first layer of the battery cell structure in the direction from the inside to the outside.

9. A battery comprising: A shell and a battery cell structure, wherein the battery cell structure is arranged in the shell, and is characterized in that the battery cell structure is the battery cell structure according to any one of claims 1 to 8.

10. An energy storage device, characterized in that: include: The battery according to claim 9.

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