CN220665195U - Gummed paper, battery cell, battery and electricity utilization device - Google Patents

Abstract

The utility model provides gummed paper, an electric core, a battery and an electric device. According to the technical scheme, the problems of battery core fluffiness and inner ring opening can be avoided, and the shaping effect and the structural stability of the battery core are improved.

Description

Gummed paper, battery cell, battery and electricity utilization device

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to gummed paper, an electric core, a battery and an electric device.

Background

The lithium ion battery cell is generally wound with a certain length by adopting a winding process, the positive electrode plate, the negative electrode plate and the diaphragm are wound together according to a certain sequence, and after heating, prepressing and shaping, a termination adhesive tape is stuck at the tail-wrapping part of the outer package along the winding direction so as to realize bundling and shaping of the battery cell. However, the adhesive bonding mode has lower fixing strength, and the problems of fluffiness and inner ring opening which are easy to occur after the battery core is pre-pressed cannot be improved.

Disclosure of Invention

The utility model mainly aims to provide gummed paper, a battery cell, a battery and an electricity utilization device, and aims to solve the problems of fluffy battery cell and an opening of an inner ring and improve the shaping effect and structural stability of the battery cell.

In order to achieve the above purpose, the gummed paper provided by the utility model comprises two compression sections and a connecting section positioned between the two compression sections, wherein the surface of the compression section is provided with an adhesive layer, and the width of the connecting section is smaller than that of the compression section.

According to the technical scheme, the adhesive paper for bundling and shaping the coiled battery cells comprises two compression sections and a connecting section positioned between the two compression sections; when the battery cell after coiling is fixed, the adhesive tape can be stuck to at least one end of the battery cell, so that the connecting section of the adhesive tape spans across the end face of the battery cell, the two pressing sections are respectively positioned at two sides of the battery cell and stuck to the surface of the battery cell, and the battery cell is pressed by being bound by the adhesive tape in the crossing direction of the adhesive tape, so that the problems of fluffiness and opening caused by poor sticking effect of the inner ring of the battery cell after coiling and prepressing can be solved, the battery cell can be prevented from becoming fluffy or opening in the inner ring in the transportation process of logistics belt, and the shaping effect and structural stability of the battery cell are improved.

In addition, the width of the gummed paper connecting section is smaller than that of the pressing section, so that the pressing sections at two ends can keep larger width to be tightly attached to the battery core, meanwhile, the influence of the too wide connecting section on the electrolyte infiltration process during the electrolyte injection of the battery core and the exhaust of the battery core during formation is avoided, in addition, the gummed paper pulling force can be reduced, the gummed paper can be stretched out during the charge-discharge cyclic expansion of the battery core, and the electrode slice cracking during the charge-discharge cyclic expansion of the battery core caused by stress concentration at the gummed paper attaching position is avoided.

In one embodiment of the present application, the minimum width D of the connecting section and the maximum width D of the pressing section satisfy 0.25 d.ltoreq.d.ltoreq.0.5D. By the arrangement, when the compression section of the gummed paper is clung to the battery cell, the connection section cannot be too wide, so that the electrolyte infiltration and formation exhaust process are not affected.

In one embodiment of the application, the width d1 of the connecting section is 10mm less than or equal to d1 less than or equal to 20mm; the arrangement avoids the influence of too wide connecting section on electrolyte infiltration and battery formation exhaust process, and the connecting section has proper tension limit, so that the battery core is prevented from being bound well due to the fact that the adhesive paper is easy to stretch off when being stuck, and the adhesive paper can be stretched by expansion force when the battery core is expanded in charge-discharge circulation;

and/or the width d2 of the pressing section is smaller than or equal to 20mm and smaller than or equal to 40mm, so that the contact area between the pressing section and the battery cell is not too small, and the pressing section is stably adhered to the surface of the battery cell.

In an embodiment of the present application, the width of the pressing section is gradually reduced from one end far away from the connecting section to a direction close to the connecting section. The setting like this for compress tightly the continuous transition in edge of section and linkage segment, with avoid the width abrupt change of gummed paper and appear the breach in edge position, the gummed paper is torn the risk of breaking when reducing to paste gummed paper.

In an embodiment of the present application, at least a partial area of the connection section is provided with a penetration hole. The arrangement further reduces the influence of the connecting section on the electrolyte infiltration and the battery formation exhaust process; the battery cell can also play a role in reducing the pulling force of the adhesive tape, can reduce the upper limit of the pulling force of the adhesive tape, is favorable for the adhesive tape to be automatically stretched out when the battery cell is expanded, and prevents the battery cell from generating stress concentration at the adhesive tape pasting position to cause the pole piece to crack due to the expansion force of the battery cell.

In one embodiment of the present application, the length L1 of the connecting section and the total length L2 of the gummed paper satisfy that L2 is 40% L2. Ltoreq.l1.ltoreq.60% L2. The setting is so limited the connecting section to the falling range of gummed paper pulling force for gummed paper pulling force is located required within range in order to satisfy the user demand.

In one embodiment of the present application, at least a portion of the gummed paper has a pattern and/or color. The setting makes the gummed paper be convenient for distinguish thereby judge the state of pasting of gummed paper.

The application also provides a battery cell, including battery cell unit and the adhesive tape according to any of the foregoing embodiments, at least one end of battery cell unit perpendicular to the winding direction is pasted and is equipped with the adhesive tape, the linkage segment is spanned the terminal surface of battery cell unit, the compaction segment at adhesive tape both ends is pasted respectively and is located the battery cell unit is opposite to the two surfaces that set up.

In an embodiment of the present application, at least one of the adhesive tapes is disposed between two lugs of the battery cell unit; by the arrangement, the adhesive paper is approximately positioned in the middle of the battery cell unit, and the other side is easy to be fluffy when the adhesive paper is prevented from being deviated to one side of the tab.

And/or, the end parts of the battery cell units are provided with at least two gummed papers side by side. So set up, improve the tie-down force to electric core unit, improve electric core structural stability.

The present application also proposes a battery comprising an electrical cell as described in any of the previous embodiments.

The application also provides an electric device comprising the battery according to the previous embodiment.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a block diagram of one embodiment of an adhesive tape of the present utility model;

fig. 2 is a block diagram of an embodiment of a cell of the present utility model.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Reference to a battery in embodiments of the present disclosure refers to a single physical module that includes one or more battery cells to provide a predetermined voltage and capacity. The battery cells are basic units in the battery, and can be generally divided into: cylindrical battery cells, cuboid battery cells and soft package battery cells. Hereinafter, it will be mainly developed around the rectangular parallelepiped battery cells. It should be understood that the embodiments described hereinafter are also applicable in certain respects to cylindrical battery cells or pouch battery cells.

Each battery cell may be a secondary battery or a primary battery, and in a general battery cell structure, the battery cell includes a housing, an electric core and an electrolyte, the housing is a component for forming an internal environment of the battery cell, wherein the formed internal environment may be used for accommodating the electric core, the electrolyte and other components, the shape of the housing may be determined according to the specific shape and size of the electric core, and the material of the housing may be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic and the like, which is not particularly limited in the embodiments of the present application. The battery core is generally wound for a certain length by adopting a winding process, the positive electrode plate, the negative electrode plate and the diaphragm are wound together for a certain length according to a certain sequence, and then the battery core is fixed by sticking adhesive paper after heating, prepressing and shaping, and the battery core is generally bound and shaped by sticking a termination adhesive tape at the tail end of the outer package along the winding direction because electrolyte is generally injected from the end part of the battery core. The positive pole piece and the negative pole piece in the battery cell comprise pole lugs. In order to reduce the risk of fusing when a large current is passed, the number of positive electrode tabs is plural and stacked together, and the number of negative electrode tabs is plural and stacked together. The tab is electrically connected with electrode terminals, which are located outside the battery cell, through a connection member, and the electrode terminals generally include a positive electrode terminal and a negative electrode terminal. For rectangular battery cells, tabs are typically provided at the ends. Multiple battery cells are connected in series and/or parallel via tab connections for use in various applications; electrolyte infiltrated cell refers to the positive electrode plate and the negative electrode plate of the electrolyte infiltrated cell. Thus, lithium ions can move to the positive electrode plate through the electrolyte and are embedded into the positive electrode active substance of the positive electrode plate, and lithium ions can also move to the negative electrode plate through the electrolyte and are embedded into the negative electrode active substance of the negative electrode plate.

In the charge-discharge cycle process of the battery, the temperature in the battery changes, on one hand, the temperature changes can cause the expansion and contraction of the pole piece in the battery core, on the other hand, the pole piece can cause the phenomena of lithium removal and lithium intercalation in the charge-discharge process, and the expansion and contraction of the pole piece can cause the expansion and contraction of the sheet winding core in the width and thickness directions; with the increase of the cycle times, the rebound of the negative electrode plate is increased, and the accumulation of side reaction products causes the thickening of the negative electrode plate, so that the negative electrode plate is irreversibly expanded, and the cell is irreversibly expanded in the width and thickness directions.

Based on the above-mentioned problem, the application provides a gummed paper 10, can be applied on the electric core 100 of battery for the electric core 100 after the fixed winding, gummed paper 10 pastes and establishes at least one end of electric core 100 perpendicular to the winding direction, in order to avoid the fluffy deformation of electric core 100 effectively, keeps electric core 100 structural stability. The structure of the gummed paper 10 will be described below with reference to the embodiment.

Referring to fig. 1 and 2, in some embodiments of the present application, the gummed paper 10 includes two pressing sections 11 and a connecting section 13 located between the two pressing sections 11, the surface of the pressing section 11 is provided with an adhesive layer, and the width of the connecting section 13 is smaller than the width of the pressing section 11.

The adhesive tape 10 that this application embodiment provided is used for pasting the tip of establishing at electric core 100 in order to compress tightly fixed electric core 100, can paste at arbitrary one end of electric core 100 and establish adhesive tape 10, also can paste at the both ends of electric core 100 and be equipped with adhesive tape 10, and when the width of electric core 100 is great, can paste at the tip of electric core 100 and establish two or more adhesive tape 10, when adhesive tape 10 pastes the one end of establishing at having tab 31, can make between two tabs 31 of adhesive tape 10 position.

Defining that the gummed paper 10 has a length direction, the gummed paper 10 comprises two pressing sections 11 which are arranged at intervals along the length direction and a connecting section 13 which is positioned between the two pressing sections 11 and is used for connecting the two pressing sections 11, and correspondingly, the gummed paper 10 has a width direction which is perpendicular to the length direction; in actual use, the connecting section 13 between two ends of the adhesive tape 10 spans the end face of the battery cell 100, and the compression sections 11 at two ends of the adhesive tape 10 are positioned at two sides of the battery cell 100, wherein adhesive layers can be arranged on the compression sections 11 only, so that the two compression sections 11 are respectively attached to two opposite surfaces of the battery cell 100, each compression section 11 is tensioned by the connecting section 13 and the other compression section 11, so that the compression sections 11 at each side have an effect similar to the compression of the battery cell 100, and are tightly attached to the surface of the battery cell 100, and the battery cell 100 is restrained and clamped by the adhesive tape 10 in the spanning direction of the adhesive tape 10, so that the problems of fluffiness of the wound battery cell 100 and opening of the inner ring of the battery cell 100 due to the action of internal stress or the action of external force such as vibration in the transportation process of a logistics belt can be avoided, and the structure of the wound battery cell 100 is kept stable; one of the compression sections 11 can be attached to the winding ending position of the battery cell 100, so that the bending and warping of the ending position can be avoided. It should be noted that, an adhesive layer may be disposed on the surface of the connection section 13 of the adhesive tape 10, so that the connection section 13 of the adhesive tape 10 is adhered to the end surface of the battery cell 100, thereby improving the connection strength between the adhesive tape 10 and the battery cell 100.

For the battery cell, electrolyte is generally injected inwards from the end face of the battery cell 100, so that the electrolyte infiltrates the positive electrode piece and the negative electrode piece of the battery cell 100; in addition, when the battery cell is formed, the electrolyte generates gas and needs to be discharged from the end face of the battery cell 100, and if the gummed paper 10 is attached to the end face of the electrolyte injection or the gas discharge, the process of injecting part of the electrolyte into the battery cell 100 or discharging the battery formation is blocked; in this embodiment of the application, through the width that reduces the adhesive tape 10 linkage segment 13 for the width of linkage segment 13 is less than the width that compresses tightly segment 11, and at this moment, compressing tightly segment 11 has sufficient area of pasting and electric core 100 surface laminating, makes compressing tightly segment 11 can firmly paste and establish on electric core 100, and has reduced the width of linkage segment 13, just reduced the hindrance when electric core 100 terminal surface pours into electrolyte process and battery formation exhaust into, reduced the influence to electrolyte infiltration electrode and formation exhaust.

In addition, because the battery expands the battery core 100 due to the temperature change in the battery during the charge-discharge cycle, if the structural strength of the gummed paper 10 is too high to always keep the state of pressing the battery core 100, the expansion of the battery core 100 is limited at this time, and the internal stress of the battery core 100 is concentrated to possibly cause the cracking of the pole piece; at this time, the reduction of the width of the connecting section 13 can also effectively reduce the pulling force of the adhesive tape 10, so that the adhesive tape 10 can be stretched by the expansion force when the battery cell 100 expands due to charge and discharge of the battery, and the situation that the pole piece cracks due to stress concentration generated when the battery cell 100 expands due to the adhesive tape 10 binding the battery cell 100 is avoided; through experiments or calculation, the suitable width of the connecting section 13 can be obtained by integrating factors such as the size of the battery cell 100, the expansion force, the material of the adhesive tape 10, the aperture size of the permeation hole 15 when the permeation hole 15 is formed, the size of the area where the permeation hole 15 is formed, and the like, thereby avoiding that the adhesive tape 10 is easily torn in the pasting process due to too small pulling force of the adhesive tape 10, and avoiding that the expansion force cannot stretch the belt due to too large pulling force of the adhesive tape 10. It should be understood that when the adhesive tape 10 is stretched by the expanding force, one of the compression sections 11 of the adhesive tape 10 is stuck at the winding ending position of the battery cell 100, and the battery cell 100 is fixed in the housing of the battery cell, so that the battery cell 100 can be prevented from being fluffy.

In this embodiment, the width of the connecting section 13 is smaller than the width of the pressing section 11, so that the width of the gummed paper 10 gradually contracts from two ends to two ends, or the pressing section 11 and the connecting section 13 may change stepwise, which is not limited herein.

Therefore, it can be appreciated that the technical solution in the embodiments of the present application provides a gummed paper 10 for bundling and shaping a wound battery cell 100, where the gummed paper 10 includes two pressing sections 11 and a connecting section 13 located between the two pressing sections 11; when the coiled battery cell 100 is fixed, the adhesive tape 10 can be attached to at least one end of the battery cell 100, so that the connecting section 13 of the adhesive tape 10 spans across the end face of the battery cell 100, the two pressing sections 11 are respectively positioned on two sides of the battery cell 100 and are attached to the surface of the battery cell 100, and the battery cell 100 is pressed by being bound by the adhesive tape 10 in the spanning direction of the adhesive tape 10, so that the problems of fluffiness and opening caused by poor attaching effect of the inner ring of the battery cell 100 after coiling and prepressing can be solved, the battery cell 100 can be prevented from becoming fluffy or opening in the inner ring in the transportation process of logistics belts, and the shaping effect and the structural stability of the battery cell 100 are improved.

Moreover, the width of the connecting section 13 of the adhesive tape 10 is smaller than the width of the pressing section 11, so that the pressing sections 11 at two ends can keep larger width to be tightly attached to the battery cell 100, meanwhile, the influence of the connecting section 13 on the electrolyte infiltration process during the liquid injection of the battery cell 100 and the influence of the exhaust of the battery cell 100 during formation are avoided, in addition, the tension of the adhesive tape 10 can be reduced, the adhesive tape 10 can be stretched out during the charge-discharge cyclic expansion of the battery cell 100, and the pole piece cracking during the charge-discharge cyclic expansion of the battery cell 100 caused by stress concentration at the adhesive tape 10 pasting position is avoided.

Referring to fig. 1 and 2, in some embodiments of the present application, the minimum width D of the connecting section 13 and the maximum width D of the pressing section 11 are equal to or greater than 0.25D and equal to or greater than 0.5D.

In this embodiment, in the length direction of the gummed paper 10, the widths of each position of the connecting section 13 may be kept consistent, or the widths of the connecting section 13 at different positions in the length direction of the gummed paper 10 may be made different; and the width of each compressing section 11 in each position along the length direction of the gummed paper 10 is kept consistent, so that the widths of the compressing sections 11 in different positions along the length direction of the gummed paper 10 can be different, and the shapes and the sizes of the compressing sections 11 at two ends of the gummed paper 10 can be the same or different. The setting that D is less than or equal to 0.25D is less than or equal to 0.5D between the minimum width D of the connecting section 13 and the maximum width D of any compressing section 11 is less than or equal to 0.5D, when the compressing section 11 of the adhesive tape 10 is tightly attached to the battery cell 100, the connecting section 13 cannot be too wide to influence the electrolyte infiltration and formation exhaust process, and the connecting section 13 has a proper tension limit, so that the adhesive tape 10 is prevented from being easily broken when being attached and the battery cell 100 cannot be well bound, and the expansion force can be stretched when the battery cell 100 is expanded in a charge-discharge cycle.

In one embodiment of the present application, the width d1 of the connecting section 13 is 10 mm.ltoreq.d1.ltoreq.20mm.

In this embodiment, the width d1 of the connection section 13 is between 10mm and 20mm, where d1 can take on values of 10mm, 10.1mm, 11mm, 11.2mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm or any value between 10mm and 20mm, if d1 is smaller than 10mm, the connection section 13 is too narrow, and is easily broken under the action of internal stress of the battery cell 100 or external force in the transportation process during pasting or pre-pressing, so that the battery cell 100 cannot be bound, and if d1 exceeds 20mm, the pulling force required for stretching the adhesive tape 10 is large, which may cause the problem that the adhesive tape 10 cannot be stretched during battery charge-discharge expansion. When the width d1 of the connecting section 13 is in the range of 10mm to 20mm, the connecting section 13 with the narrower middle part of the gummed paper 10 can not be easily torn off during pasting, and the problem that the connecting section 13 is too wide to cause high strength and is difficult to be broken is avoided. Of course, it should be noted that when the gummed paper 10 made of different materials is adopted, or the connecting section 13 is perforated or otherwise structurally modified, the width of the connecting section 13 can also exceed the above-mentioned size range to achieve similar technical effects.

In one embodiment of the present application, the width d2 of the pressing section 11 is 20 mm.ltoreq.d2.ltoreq.40 mm.

In this embodiment, the width d2 of the pressing section 11 is between 20mm and 40mm, where d2 may be 20mm, 20.1mm, 21mm, 21.2mm, 22mm, 25mm, 27mm, 28mm, 30mm, 32mm, 34mm, 36mm, 37mm, 39mm, 40mm or any value between 20mm and 40mm, if d2 is less than 20mm, the adhesion connection area between the pressing section 11 and the cell 100 is smaller, the connection strength between the pressing section 11 and the cell 100 is insufficient, and the pressing section 11 is easy to fall off from the cell 100 when the cell 100 expands due to the action of internal stress or external force in the transportation process after the cell 100 is pre-pressed, so that the adhesive tape 10 cannot better play a role in binding the cell 100; the width of the connecting section 13 is typically reduced by removing material, and if d2 is greater than 40mm, more material must be cut and removed to form the connecting section 13 to the desired width dimension, which is more wasted material. When the width of the pressing section 11 is in the range of 20mm to 40mm, the pressing section 11 can be stably adhered to the battery cell 100, the gummed paper 10 is easy to cut, machine and form, and the material waste is reduced.

Referring to fig. 1 and 2, in some embodiments of the present application, the width of the pressing section 11 tapers from one end far from the connecting section 13 to a direction near to the connecting section 13.

In this embodiment, the width of the pressing section 11 gradually contracts from the end far from the connecting section 13 to the connecting section 13, which may be a straight line that makes the edge of the pressing section 11 incline to the middle, or an arc edge that makes the edge of the pressing section 11, which is not limited herein; by the arrangement, the edges of the pressing section 11 and the connecting section 13 can be continuously transited, so that the width of the gummed paper 10 is prevented from suddenly changing to form a notch at the edge position, and the gummed paper 10 is prevented from being easily torn at the notch when the gummed paper 10 is adhered.

Referring to fig. 1 and 2, in some embodiments of the present application, at least a portion of the connection section 13 is provided with a penetration hole 15.

According to the method, the width dimension of the connecting section 13 of the end face of the battery cell 100 is reduced on the adhesive tape 10, so that the influence of the connecting section 13 on the electrolyte infiltration and the exhaust process during battery formation is reduced, and the tensile force of the adhesive tape 10 can be reduced by reducing the width of the connecting section 13, so that the adhesive tape 10 is stretched out when the battery cell 100 is expanded due to the charge-discharge cycle, and the situation that the adhesive tape 10 is bound with the battery cell 100 to cause stress concentration to cause pole piece cracking is avoided. In the embodiment, the penetrating holes 15 are formed in the connecting section 13, and the covering area of the connecting section 13 is reduced due to the arrangement of the penetrating holes 15, so that electrolyte can penetrate from the penetrating holes 15 into the battery cell 100 through the gummed paper 10 to infiltrate the electrode plates faster, and gas generated by vaporization of the electrolyte during battery formation can be discharged outwards from the penetrating holes 15, thereby further reducing the influence on electrolyte infiltration and formation exhaust when the rubberizing mode is adopted; in addition, the arrangement of the permeation hole 15 can also play a role in reducing the tensile force of the adhesive tape 10, can reduce the upper limit of the tensile force of the adhesive tape 10, is beneficial to the automatic stretch-breaking of the adhesive tape 10 in the charge and discharge process of the battery cell 100, and prevents the electrode slice cracking caused by the stress concentration of the adhesive tape 10 at the adhesive part of the battery cell 100 due to the expansion force of the battery cell 100.

Referring to fig. 1 and 2, in some embodiments of the present application, the length L1 of the connecting section 13 and the total length L2 of the gummed paper 10 are satisfied, and L2 is 40% L2. Ltoreq.l1.ltoreq.60% L2.

In this embodiment, the length of the connecting section 13 is approximately 40% to 60% of the total length of the adhesive tape 10, so that when the width of the connecting section 13 is reduced or the penetrating hole 15 is formed, the tensile force of the adhesive tape 10 can be effectively reduced, so that the adhesive tape 10 can be rapidly stretched when the battery is repeatedly charged, discharged and expanded, and the pole piece cracking caused by stress concentration at the pasting position of the adhesive tape 10 is avoided.

In some embodiments, the overall length of the gummed paper 10 is 40mm, the length of the porous structure is 20mm, the area of the porous structure accounts for 50% of the overall length, the pore diameter is approximately 5mm, the pulling force of the gummed paper 10 is reduced by about 25% compared with the original pulling force, and the pulling force is obviously reduced.

In some embodiments of the present application, at least a portion of the area of the gummed paper 10 is patterned and/or colored.

It can be appreciated that the adhesive effect of the adhesive tape 10 needs to be checked after the adhesive tape 10 is adhered, so that the adhesive tape 10 can better bind the battery cell 100. In this embodiment, at least part of the area of the adhesive tape 10 is provided with a pattern, a color, etc., for example, a pattern, such as a letter, a picture, etc., is provided on the adhesive tape 10, or at least part of the adhesive tape 10 is provided with a blue, a red, or another color different from the battery cell 100, so that the adhesive tape 10 is easily recognized after being adhered to the battery cell 100, and thus, whether the adhering position and the adhering condition of the adhesive tape 10 are in line with the expectations can be quickly and easily determined, and the detection convenience of the adhering state can be improved.

Referring to fig. 2, the present application further provides a battery cell 100, where the battery cell 100 includes a battery cell unit 30 and the adhesive tape 10 according to any one of the foregoing embodiments, at least one end of the battery cell unit 30 perpendicular to the winding direction is attached with the adhesive tape 10, the connection section 13 spans across the end face of the battery cell unit 30, and the compression sections 11 at two ends of the adhesive tape 10 are respectively attached to two surfaces of the battery cell unit 30 opposite to each other. When the adhesive paper 10 is adopted to meticulously fix and shape the battery cell 100, the connecting sections 13 between two ends of the adhesive paper 10 span the end face of the battery cell 100, the compression sections 11 at two ends of the adhesive paper 10 are positioned at two sides of the battery cell 100, wherein adhesive layers can be arranged on the compression sections 11 only, so that the two compression sections 11 are respectively attached to two opposite surfaces of the battery cell 100, each compression section 11 is tensioned by the connecting sections 13 and the other compression section 11, so that the compression sections 11 at each side have an effect similar to that of compressing the battery cell 100, and are tightly attached to the surface of the battery cell 100, and the battery cell 100 is restrained and clamped by the adhesive paper 10 in the span direction of the adhesive paper 10, so that the problems that the wound battery cell 100 is fluffy due to the action of internal stress or the action of external force such as vibration in the transportation process of a logistics belt after the battery cell 100 can be avoided, and the structure of the battery cell 100 is kept stable; one of the compression sections 11 can be attached to the winding ending position of the battery cell 100, so that the bending and warping of the ending position can be avoided.

Moreover, the width of the connecting section 13 of the adhesive tape 10 is smaller than the width of the pressing section 11, so that the pressing sections 11 at two ends can keep larger width to be tightly attached to the battery cell 100, meanwhile, the influence of the connecting section 13 on the electrolyte infiltration process during the liquid injection of the battery cell 100 and the influence of the exhaust of the battery cell 100 during formation are avoided, in addition, the tension of the adhesive tape 10 can be reduced, the adhesive tape 10 can be stretched out during the charge-discharge cyclic expansion of the battery cell 100, and the pole piece cracking during the charge-discharge cyclic expansion of the battery cell 100 caused by stress concentration at the adhesive tape 10 pasting position is avoided.

Because the battery cell 100 provided in the present application adopts all the technical solutions of all the embodiments, at least the beneficial effects brought by the technical solutions of the embodiments are provided, and will not be described in detail herein.

In an embodiment of the present application, the end portions of the battery cell 30 are disposed with at least two of the adhesive tapes 10 side by side.

In this embodiment, when the width of the battery cell 100 is larger, two or more adhesive tapes 10 may be attached to the end of the battery cell 100, which is not limited herein; at this time, both ends of the battery cell 100 are adhered and fixed through the adhesive tape 10, so that both ends of the battery cell 100 are bound by the adhesive tape 10, the binding and shaping effects on the battery cell 100 are improved, the problems of fluffiness and opening of an inner ring of the battery cell 100 are effectively avoided, and the structural stability of the battery cell 100 is improved.

In an embodiment of the present application, at least one of the adhesive tapes 10 is disposed between two tabs 31 of the battery cell unit 30.

So set up, the binding force of gummed paper 10 to electric core unit 30 is located electric core unit 30 approximately middle part position for each electrode middle part of electric core unit 30 is pressed from both sides tight constraint by gummed paper 10, makes the structure of electric core unit 30 more stable.

The present application also proposes a battery comprising a cell 100 as described in any of the previous embodiments. Reference to a battery in embodiments of the present disclosure refers to a single physical module that includes one or more battery cells to provide a predetermined voltage and capacity. Each battery cell may be a secondary battery or a primary battery, and in a general battery cell structure, the battery cell includes a housing, an electric core 100, and an electrolyte, the housing is a component for forming an internal environment of the battery cell, wherein the formed internal environment may be used to accommodate the electric core 100, the electrolyte, and other components, the shape of the housing may be determined according to the specific shape and size of the electric core 100, and the material of the housing may be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiments of the present application. The battery cell 100 is generally manufactured by winding a positive electrode plate, a negative electrode plate and a diaphragm together for a certain length according to a certain sequence, heating, prepressing and shaping, and fixing the battery cell 100 by using a gummed paper 10, wherein the battery cell 100 adopted by the battery of the application is fixed by using the gummed paper 10 in the embodiment, and the gummed paper 10 comprises two compaction sections 11 arranged at intervals along the length direction and a connecting section 13 positioned between the two compaction sections 11 and used for connecting the two compaction sections 11, and correspondingly, the gummed paper 10 has a width direction perpendicular to the length direction; in actual use, the connecting section 13 between two ends of the adhesive tape 10 spans the end face of the battery cell 100, and the compression sections 11 at two ends of the adhesive tape 10 are positioned at two sides of the battery cell 100, wherein adhesive layers can be arranged on the compression sections 11 only, so that the two compression sections 11 are respectively attached to two opposite surfaces of the battery cell 100, each compression section 11 is tensioned by the connecting section 13 and the other compression section 11, so that the compression sections 11 at each side have an effect similar to the compression of the battery cell 100, and are tightly attached to the surface of the battery cell 100, and the battery cell 100 is restrained and clamped by the adhesive tape 10 in the spanning direction of the adhesive tape 10, so that the problems of fluffiness of the wound battery cell 100 and opening of the inner ring of the battery cell 100 due to the action of internal stress or the action of external force such as vibration in the transportation process of a logistics belt can be avoided, and the structure of the wound battery cell 100 is kept stable; one of the compression sections 11 can be attached to the tail-end position of the winding of the battery cell 100, so that the tail-end position is prevented from warping and bending; moreover, the width of the connecting section 13 of the adhesive tape 10 is smaller than the width of the pressing section 11, so that the pressing sections 11 at two ends can keep larger width to be tightly attached to the battery cell 100, meanwhile, the influence of the connecting section 13 on the electrolyte infiltration process during the liquid injection of the battery cell 100 and the influence of the exhaust of the battery cell 100 during formation are avoided, in addition, the tension of the adhesive tape 10 can be reduced, the adhesive tape 10 can be stretched out during the charge-discharge cyclic expansion of the battery cell 100, and the pole piece cracking during the charge-discharge cyclic expansion of the battery cell 100 caused by stress concentration at the adhesive tape 10 pasting position is avoided.

The battery provided by the application applies all the technical schemes of all the embodiments, so that the battery has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.

The application also proposes an electrical device comprising a battery as described in the previous embodiments. The electric device in the embodiment of the application may be, but is not limited to, a mobile phone, a portable device, a notebook computer, an electric car, a ship, a spacecraft, an electric toy, an electric tool, and the like, for example, a spacecraft including an airplane, a rocket, a space plane, a spacecraft, and the like, an electric toy including a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric aircraft toy, and the like, and an electric tool including a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and an electric tool for a railway, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer.

The power utilization device provided by the application applies all the technical schemes of all the embodiments, so that the power utilization device at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (11)

1. The gummed paper is characterized by comprising two compression sections and a connecting section positioned between the two compression sections, wherein an adhesive layer is arranged on the surface of the compression sections, and the width of the connecting section is smaller than that of the compression sections.

2. The gummed paper as set forth in claim 1, wherein the minimum width D of said connecting section and the maximum width D of said pressing section satisfy 0.25 d.ltoreq.d.ltoreq.0.5D.

3. The gummed paper as set forth in claim 2, wherein the width d1 of said connecting section is 10 mm.ltoreq.d1.ltoreq.20mm;

and/or the width d2 of the compaction section is satisfied, and d2 is more than or equal to 20mm and less than or equal to 40mm.

4. The gummed paper as set forth in claim 1, wherein the width of said pressing section is tapered from an end away from said connecting section toward a direction approaching said connecting section.

5. The gummed paper as set forth in claim 1, wherein at least a partial area of said connecting section is provided with a penetration hole.

6. The gummed paper as set forth in claim 1, wherein the length L1 of said connecting section and the total length L2 of said gummed paper satisfy 40% l2.ltoreq.l1.ltoreq.60% L2.

7. A gummed paper as claimed in any one of claims 1 to 6, characterized in that at least part of the area of the gummed paper has a pattern and/or a colour.

8. The battery cell is characterized by comprising a battery cell unit and the adhesive tape according to any one of claims 1 to 7, wherein the adhesive tape is attached to at least one end of the battery cell unit perpendicular to the winding direction, the connecting section spans the end face of the battery cell unit, and the compression sections at two ends of the adhesive tape are respectively attached to two surfaces of the battery cell unit, which are opposite to each other.

9. The battery cell of claim 8, wherein at least one of the adhesive papers is disposed between two ears of the battery cell unit;

and/or, the end parts of the battery cell units are provided with at least two gummed papers side by side.

10. A battery comprising the cell of claim 8 or 9.

11. An electrical device comprising the battery of claim 10.