CN216903260U

CN216903260U - Battery cell, battery and power consumption device

Info

Publication number: CN216903260U
Application number: CN202220023183.9U
Authority: CN
Inventors: 周文林; 徐良帆; 李全坤; 王鹏; 金海族
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-07-05
Anticipated expiration: 2032-01-05

Abstract

The application relates to a battery monomer, battery and power consumption device belongs to battery manufacturing technical field. The application provides a battery monomer, includes: a housing; an end cap; end cover pasting; the insulating film comprises a main body part and a flanging part, and the flanging part is arranged between the end cover and the end cover patch; the first adhesive layer comprises a first part and a second part which are continuously arranged, the first part is arranged around the second part, the first part is arranged between the flanging part and the end cover paster, the first part is used for bonding the flanging part and the end cover paster, the second part is arranged between the end cover and the end cover paster, and the second part is used for bonding the end cover and the end cover paster; wherein the thickness of the first portion is less than the thickness of the second portion. The battery monomer has better safety performance. The application also provides a battery and an electric device, comprising the battery monomer.

Description

Battery cell, battery and power consumption device

Technical Field

The application relates to the technical field of battery manufacturing, in particular to a battery cell, a battery and an electric device.

Background

With the continuous prosperity of the new energy automobile market, the power battery industry is rapidly expanded and strong, the lithium battery technology is increasingly advanced, and higher requirements on the safety performance of the battery are provided.

However, during the use of the battery, the battery itself may be aged and bumpy and vibrate, which may cause short circuit inside the battery, further causing safety accidents.

SUMMERY OF THE UTILITY MODEL

Therefore, the application provides a battery cell, a battery and an electric device, which have better safety performance.

An embodiment of a first aspect of the present application provides a battery cell, including: a housing having an opening; an end cap covering the opening; the end cover patch is arranged on one side of the end cover, which is far away from the interior of the shell; the insulating film comprises a main body part and a flanging part, the main body part is coated on the outer surface of the shell, and the flanging part is arranged between the end cover and the end cover patch; and a first adhesive layer comprising a first portion and a second portion arranged in series, the first portion being arranged around the second portion, the first portion being arranged between the cuff and the end cap patch, the first portion being arranged to bond the cuff to the end cap patch, the second portion being arranged between the end cap and the end cap patch, the second portion being arranged to bond the end cap to the end cap patch; wherein the thickness of the first portion is less than the thickness of the second portion.

In the single battery of this application embodiment, the first part of first glue film sets up between turn-ups portion and end cover paster, the second part sets up between end cover and end cover paster, the thickness of first part is less than the thickness of second part, can adapt to the difference of interval between turn-ups portion and the end cover paster and the interval between end cover and the end cover paster, stress is even when making end cover paster and turn-ups portion and end cover bond, the edge of end cover paster is difficult to separate with the end cover, and then avoid turn-ups portion from the end cover perk, the inside distance that extends of edge-ups portion edge cover's edge has been guaranteed, the free creepage distance of battery, thereby effectively insulate and keep apart these two free battery's shell when two adjacent single batteries establish ties, the security performance of battery has been improved.

According to some embodiments of the application, the first portion has a first surface facing the patch of end caps, the second portion has a second surface facing the patch of end caps, the first surface being flush with the second surface.

In above-mentioned scheme, first surface and second surface parallel and level make one side and the end cover paster unstressed that is close to the end cover paster of first glue film bond, can avoid the end cover paster to lead to its edge and end cover separation owing to the stress inequality.

According to some embodiments of the application, a sum of a thickness of the first portion and a thickness of the cuff is equal to a thickness of the second portion.

In the scheme, the first part can fill the gap between the flanging part and the end cover patch, and the second part can fill the gap between the end cover and the end cover patch, so that the end cover and the end cover patch are bonded and connected through the first adhesive layer in a stress-free manner.

According to some embodiments of the present application, the end cap includes an end cap body and a first protrusion, the end cap body is disposed around the first protrusion, the first protrusion protrudes from the end cap body in a direction away from the interior of the housing, and the cuff, the first portion, and the second portion are disposed between the end cap body and the end cap patch.

In the above scheme, the first protrusion protrudes in a direction away from the interior of the case, so that more space can be provided on one side of the end cover facing the interior of the battery cell to accommodate components arranged on the end cover, and the space occupied by the components in the case is reduced, so that more space is provided in the case for arranging the electrode assembly, and the energy density of the battery cell is improved; and turn-ups portion, first portion and second part all set up between end cover body and end cover paster, can not only avoid the part that sets up on the end cover, can also simplify the structure of first glue film.

According to some embodiments of the present application, the first layer of glue further comprises a third portion disposed contiguously with the second portion, the third portion disposed between the first protrusion and the end cap patch.

In the above scheme, the third part can fill the gap between the first convex part and the end cover patch, so that the internal stress of the end cover patch is uniform when the end cover patch is bonded with the end cover, and the possibility of the edge of the end cover patch being raised is reduced.

According to some embodiments of the application, the first protrusion includes a top wall and a side wall, the side wall being enclosed around the top wall, the side wall connecting the top wall and the end cap body, the third portion being disposed between the side wall and the end cap patch.

In the above scheme, the third part bonds the side wall of the first convex part with the end cover patch, so that not only are components arranged on the top wall avoided, but also gaps between the side wall and the end cover patch are filled, and the internal stress of the end cover patch is uniform when the end cover patch is bonded with the end cover.

According to some embodiments of the present application, the first protrusion includes a top wall and a side wall, the side wall being disposed around the top wall, the side wall connecting the top wall and the end cap body; the end cover paster comprises a paster body and a second adhesive layer, the second adhesive layer is located on one side, facing the end cover, of the paster body, and the second adhesive layer is used for bonding the top wall with the paster body.

In the above scheme, the one side of paster body towards the end cover is equipped with the second glue film, and the second glue film is connected the roof of first convex part and the paster body of end cover paster, can further make the end cover paster firmly bond with the end cover.

According to some embodiments of the application, the second layer of adhesive covers a side of the patch body facing the end cap, the second layer of adhesive being at least partially located between the first layer of adhesive and the patch body.

In the above scheme, the second glue film still is used for bonding first glue film and paster body, can realize earlier covering the paster body with the second glue film comprehensively when the machine-shaping end cover paster, punches a hole to the end cover paster again, has simplified the manufacturing process of end cover paster.

According to some embodiments of the present application, the second glue layer comprises a fourth portion and a fifth portion, the fourth portion being arranged around the fifth portion, the fourth portion being located between the first glue layer and the patch body, the fifth portion being located between the top wall and the patch body.

In the above scheme, the fourth part of the second adhesive layer is used for bonding the first adhesive layer and the patch body, the fifth part is used for bonding the top wall and the patch body, and the fourth part and the fifth part fill the gap between the patch body and the end cover together so as to improve the stress uniformity when the patch body is bonded with the end cover.

According to some embodiments of the application, first glue film is heat conduction colloid, the end cover paster is provided with the through-hole, first glue film still includes the second convex part, the second convex part is to keeping away from the direction protrusion of end cover, the second convex part is filled the through-hole.

In above-mentioned scheme, first glue film and end cover heat conduction laminating, the temperature of end cover can be represented to the temperature of second convex part to utilize the temperature sampling part of second convex part and outside to be connected with the temperature of gathering the end cover, monitor the free operating condition of battery, improve the free security performance of battery.

According to some embodiments of the application, the end cover is rectangular, the flanging part is provided with an overlapping area at four corners of the end cover, and notches for avoiding the overlapping area are arranged at the four corners of the first glue layer.

In the scheme, the thickness of the overlapping area of the flanging part is larger than that of the rest areas, the notches at the four corners of the first glue layer can avoid the overlapping area of the flanging part, and the overlapping area is partially accommodated in the notches, so that the stress is uniform when the end cover patch is bonded with the end cover.

According to some embodiments of the application, a side of the patch of end caps facing the end caps is provided with recesses, which are arranged in correspondence with the overlapping area.

In the above scheme, the end cover patch is provided with the concave part corresponding to the overlapping area of the flanging part, so that the overlapping area of the flanging part can be avoided further, the stress is uniform when the end cover patch is bonded with the end cover, the distance between the end cover patch and the end cover can be reduced, the degree of the end cover patch protruding out of the end cover is reduced, and the external size of a battery cell provided with the end cover patch is reduced.

The embodiment of the second aspect of the present application provides a battery, including the battery cell provided in the embodiment of the first aspect of the present application.

Due to the characteristics of the single battery in the embodiment of the first aspect of the present application, the battery in the embodiment of the second aspect of the present application also has better safety performance.

In an embodiment of the third aspect of the present application, an electric device is provided, which includes the battery provided in the embodiment of the second aspect of the present application, and the battery is used for providing electric energy.

Due to the characteristics of the battery cell in the embodiment of the first aspect of the present application, the electric device in the embodiment of the third aspect of the present application also has better safety performance.

An embodiment of a fourth aspect of the present application provides a method for manufacturing a battery cell, including:

providing a housing and an end cap, the housing having an opening;

covering the end cap on the opening;

providing an insulating film;

coating the main body part of the insulating film on the outer surface of the shell, and coating the flanging part of the insulating film on one side of the end cover, which is far away from the interior of the shell;

providing an end cap patch;

the end cover patch is adhered to one side, deviating from the shell, of the end cover through a first adhesive layer, the first adhesive layer comprises a first portion and a second portion which are continuously arranged, the first portion surrounds the second portion, the first portion is arranged between the flanging portion and the end cover patch and is adhered to the flanging portion and the end cover patch, the second portion is arranged between the end cover and the end cover patch and is adhered to the end cover patch and the end cover patch, and the thickness of the first portion is smaller than that of the second portion.

An embodiment of a fifth aspect of the present application provides a manufacturing apparatus of a battery cell, including:

a first providing means for providing a housing and an end cap, the housing having an opening;

second supply means for supplying an insulating film;

third providing means for providing an end cap patch;

the first assembly module is used for covering the end cover on the opening;

the second assembly module is used for coating the main body part of the insulating film on the outer surface of the shell and coating the flanging part of the insulating film on one side of the end cover, which is far away from the interior of the shell;

and the third assembly module is used for bonding the end cover patch to one side, deviating from the shell, of the end cover through a first adhesive layer, the first adhesive layer comprises a first part and a second part which are continuously arranged, the first part surrounds the second part, the first part is arranged on the flanging part and between the end cover patches and is used for bonding the flanging part and the end cover patches, the second part is arranged on the end cover and between the end cover patches and is used for bonding the end cover patches and the end cover patches, and the thickness of the first part is smaller than that of the second part.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 illustrates a simplified schematic diagram of a vehicle in an embodiment of the present application;

FIG. 2 is a schematic diagram of the battery of the vehicle of FIG. 1;

fig. 3 illustrates an exploded view of a battery cell according to some embodiments of the present application;

fig. 4 illustrates a schematic diagram of a cell according to some embodiments of the present application (components inside the cell are not shown);

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a partial enlarged view of FIG. 5 at B;

FIG. 7 shows an enlarged view of a portion of FIG. 5 at C;

fig. 8 illustrates a schematic structural view of an end cap patch of a battery cell of some embodiments of the present application;

FIG. 9 shows a cross-sectional view D-D of FIG. 4;

FIG. 10 shows an enlarged view of a portion of FIG. 9 at E;

FIG. 11 is a sectional view taken along line F-F of FIG. 4;

FIG. 12 is an enlarged view of a portion of FIG. 11 at G;

fig. 13 is a schematic diagram of a cell structure according to some embodiments of the present disclosure (end cap patch and first adhesive layer not shown);

fig. 14 is a schematic diagram illustrating a method of manufacturing a battery cell according to some embodiments of the present application;

fig. 15 shows a schematic view of a manufacturing apparatus of a battery cell of some embodiments of the present application;

the figures are not provided to scale.

Icon: 1000-a vehicle; 100-a battery; 10-a battery cell; 11-a housing; 111-a housing; 1111-lateral; 1112-a bottom surface; 112-an end cap; 1121-end cap body; 1122-first convex portion; 11221-side wall; 11222-top wall; 1123-first side; 12-end cap patch; 121-patch body; 122-a second glue layer; 1221-fourth section; 1222-a fifth portion; 123-flat portion; 124-grooves; 125-through holes; 126-a recess; 13-an insulating film; 131-a body portion; 132-flanging part; 1321-a first flange; 1322-a second flange; 1323-third flanging; 1324-fourth flange; 1325-overlap region; 14-an electrode terminal; 15-a bleeder; 16-a first glue layer; 161-a first portion; 1611-a first surface; 1612 — a third surface; 162-a second portion; 1621-a second surface; 1622-a fourth surface; 163-third section; 1631-a fifth surface; 1632-a sixth surface; 164-a second projection; 165-notch; 20-a box body; 21-a first box; 22-a second box; 200-a controller; 300-a motor; 2000-manufacturing equipment of battery cells; 2100-a first providing device; 2200-a second providing means; 2300-a third providing means; 2400-a first assembly module; 2500-a second assembly module; 2600-third assembly module.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Throughout the description of the present application, it is to be noted that unless otherwise expressly specified or limited the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The appearances of "a plurality" in this application are intended to mean more than two (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cell can be a cylindrical battery cell or a square battery cell.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. The battery generally includes a case for enclosing one or more battery cells, and the case prevents liquid or other foreign materials from affecting the charge or discharge of the battery cells.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece comprises a positive pole current collector and a positive pole active substance layer, wherein the positive pole active substance layer is coated on the surface of the positive pole current collector, the positive pole current collector which is not coated with the positive pole active substance layer protrudes out of the positive pole current collector which is coated with the positive pole active substance layer, and the positive pole current collector which is not coated with the positive pole active substance layer is used as a positive pole lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative active material layer, and the negative active material layer coats in the surface of negative current collector, and the negative current collector protrusion in the negative current collector who has coated the negative active material layer of uncoated negative active material layer, the negative current collector who does not coat the negative active material layer makes negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The battery cell also comprises a pressure relief piece, and the pressure relief piece is actuated when the internal pressure of the battery cell reaches a threshold value. The threshold design varies according to design requirements. The threshold value may depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte and the separator of the battery cell. The pressure relief member may take the form of, for example, an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and may specifically take the form of a pressure-sensitive or temperature-sensitive element or configuration, i.e., when the internal pressure or temperature of the battery cell reaches a threshold value, the pressure relief member performs an action or a weak structure provided in the pressure relief member is broken, thereby forming an opening or a passage through which the internal pressure or temperature can be relieved.

As used herein, "activate" means that the pressure relief element is activated or activated to a certain configuration, such that the internal pressure and temperature of the battery cell is released. The action produced by the pressure relief may include, but is not limited to: at least a portion of the relief element ruptures, fractures, is torn or opened, or the like. When the pressure relief member is actuated, high-temperature and high-pressure substances inside the battery cell are discharged as emissions from the opened portion. In this way, the battery cells can be decompressed and warmed under the condition of controllable pressure or temperature, so that the potential more serious accidents are avoided.

The battery unit further comprises a current collecting member for electrically connecting the tab of the battery unit and the electrode terminal to transmit electric energy from the electrode assembly to the electrode terminal and to the outside of the battery unit through the electrode terminal; the plurality of battery cells are electrically connected through the confluence part so as to realize series connection, parallel connection or series-parallel connection of the plurality of battery cells.

In the related art, a plurality of battery cells are connected in series during the assembly of the battery to achieve a higher output voltage, and two adjacent battery cells are arranged closely to increase the energy density of the battery. However, since the housing of each battery cell has a potential corresponding to the negative electrode of the battery cell, if the housing of the battery cell has poor insulation performance and is short-circuited with the housing of another adjacent battery cell, not only is there a potential safety hazard, but also the overall output voltage of the battery is reduced.

The inventors have found that, in order to insulate the outer case of the battery cell, the case of the outer case is generally covered with an insulating film, the edge of the insulating film is bent toward the surface of the end cap to form a burring part, an end cap patch made of an insulating material is bonded to the end cap, and the burring part of the insulating film is pressed by the edge of the end cap patch. However, the flanging portion is arranged between the edge of the end cover patch and the end cover, so that the stress of the end cover patch is uneven, the edge of the end cover patch is easily tilted after long-time use, the flanging portion is separated from the end cover, the distance from the edge of the flanging portion to the edge of the end cover is reduced, the creepage distance of a battery cell is insufficient, the insulation performance of a shell of the battery cell is affected, and the safety performance and the output voltage of the battery are further affected.

Based on above-mentioned thinking, this application provides a new technical scheme, can avoid battery monomer to rise at the edge of long-time use rear end cover paster to compress tightly the turn-ups portion of insulating film in the surface of end cover reliably, its creepage distance of battery monomer after long-time use can not reduce, thereby has guaranteed the free insulating properties of battery and the security performance of battery.

It is understood that the creepage distance of the battery cell refers to the distance that the burring extends inward from the edge of the end cap in a direction perpendicular to the thickness of the end cap. When the flanging part is attached to the surface of the end cover, the width of the flanging part is equal to the creepage distance of the single battery; when the flanging part is separated from the surface of the end cover, the creepage distance of the battery monomer is smaller than the width of the flanging part.

It can be understood that the battery cells described in the embodiments of the present application may directly supply power to the electric devices, or may form a battery module or a battery in parallel or in series, so as to supply power to various electric devices in the form of the battery module or the battery.

It is to be understood that the electric device using the battery cell, the battery module, or the battery, which is applicable to the embodiment described in the present application, may be in various forms, for example, a mobile phone, a portable device, a notebook computer, a battery car, 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 shuttle, a spacecraft, and the like, an electric toy including a stationary or mobile electric toy, for example, a game machine, an electric car toy, an electric ship toy, an electric plane toy, and the like, an electric tool including a metal cutting electric tool, an abrasive electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an electric impact drill, a concrete vibrator, and an electric planer.

The battery cell, the battery module, or the battery described in the embodiments of the present application are not only limited to be applied to the above-described electric devices, but also applicable to all electric devices using the battery cell, the battery module, and the battery.

Fig. 1 is a simplified schematic diagram of a vehicle according to an embodiment of the present application, and fig. 2 is a schematic diagram of a battery of the vehicle in fig. 1.

As shown in fig. 1, a battery 100, a controller 200, and a motor 300 are provided inside a vehicle 1000, and the battery 100 may be provided, for example, at the bottom or the front or rear of the vehicle 1000. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc.

In some embodiments of the present application, battery 100 may be used for power supply of vehicle 1000, for example, battery 100 may be used as an operating power source of vehicle 1000. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for operation power demand at the start, navigation, and traveling of the vehicle 1000.

In other embodiments, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part replacing fuel or natural gas to provide driving power for the vehicle 1000.

Here, the battery 100 referred to in the embodiments of the present application refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. The plurality of battery cells 10 may be connected in series, in parallel, or in series-parallel to directly form the battery 100, where the series-parallel connection refers to that the plurality of battery cells 10 are connected in series or in parallel. A plurality of battery cells 10 may also be connected in series, in parallel, or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series, in parallel, or in series-parallel to form the battery 100.

As shown in fig. 2, the battery 100 includes a plurality of battery cells 10 and a case 20, and the plurality of battery cells 10 are placed in the case 20. The case 20 includes a first case 21 and a second case 22, the first case 21 and the second case 22 cover each other to form a battery cavity, and the plurality of battery 100 modules are placed in the battery cavity. Wherein the shape of the first case 21 and the second case 22 may be determined according to the shape of a combination of a plurality of battery modules, and the first case 21 and the second case 22 may each have one opening. For example, each of the first casing 21 and the second casing 22 may be a hollow rectangular parallelepiped and only one of the faces is an opening face, the openings of the first casing 21 and the second casing 22 are oppositely disposed, and the first casing 21 and the second casing 22 are engaged with each other to form the casing 20 having a closed chamber. The plurality of battery cells 10 are connected in parallel or in series-parallel combination and then placed in a box body 20 formed by buckling a first box body 21 and a second box body 22.

Fig. 3 illustrates an exploded view of a battery cell according to some embodiments of the present application.

As shown in fig. 3, the battery cell 10 includes a case 11, an end cap patch 12, an insulating film 13, an electrode terminal 14, a pressure relief member 15, an electrode assembly (not shown), and a current collecting member (not shown).

The case 111 has an opening, and the case 111 may be made of a metal material such as aluminum, aluminum alloy, or nickel-plated steel. The end cap 112 covers the opening to enclose the electrode assembly inside the case 11, and the electrode terminal 14 and the pressure relief member 15 are disposed at the end cap 112. The end cap 112 has a plate-shaped structure, the size and shape of the end cap 112 are matched with the opening of the case 111, and the end cap 112 is fixed to the opening of the case 111, thereby sealing the electrode assembly and the electrolyte in the receiving cavity of the case 111. The end cap 112 is made of a metal material, such as aluminum, steel, etc.

Specifically, the end cap 112 is provided with two electrode lead-out holes, the electrode terminals 14 are provided in two, the electrode terminals 14 correspond to the electrode lead-out holes one by one, and the electrode terminals 14 are attached to the corresponding electrode lead-out holes. The pressure relief member 15 is disposed on the end cap 112 and between the two electrode terminals 14, and the pressure relief member 15 is activated when the pressure and temperature inside the battery cell 10 reach a threshold value, so as to release the pressure inside the battery cell 10.

An electrode assembly is disposed inside the case 111, and the electrode assembly includes a body, a first tab, and a second tab. The body comprises a positive pole piece, a negative pole piece and an isolation film, wherein the isolation film is positioned between the positive pole piece and the negative pole piece and used for isolating the positive pole piece from the negative pole piece. The first tab and the second tab have opposite polarities, the first tab is connected with the electrode terminal 14 with the same polarity through one current collecting member, and the second tab is connected with the electrode terminal 14 with the same polarity through the other current collecting member. In the first tab and the second tab, the first tab is an anode tab, the second tab is a cathode tab, the current collecting component corresponding to the first tab is made of aluminum, and the current collecting component corresponding to the second tab is made of copper.

The end cap patch 12 is arranged on a side of the end cap 112 facing away from the interior of the housing 111 for insulating the protective end cap 112. Specifically, the shape of the end cap patch 12 matches the shape of the side surface of the end cap 112 facing away from the interior of the housing 111. The end cap patch 12 may be a plastic piece or an insulating piece made of other materials.

The insulating film 13 includes a main body portion 131 and a flange portion 132, the main body portion 131 is wrapped around the outer surface of the housing 111, and the flange portion 132 is disposed between the end cap 112 and the end cap patch 12. The main body 131 and the cuff 132 may be integrally formed; the main body 131 and the burring 132 may be provided separately and connected. The material of the insulating film 13 may be a PET film, or may be a film material having an insulating function of another material.

In some embodiments of the present application, the housing 111 is a hexahedron, and the length direction of the housing 111 extends along a first direction X, the width direction extends along a second direction Y, and the height direction extends along a third direction Z. The electrode assembly is an elliptical body or a hexahedron, and the length direction, the width direction, and the height direction of the electrode assembly are disposed corresponding to the case 111. The end cap 112 has a rectangular plate-like structure, and the end cap 112 has a longitudinal direction extending in a first direction X, a width direction extending in a second direction Y, and a thickness direction extending in a third direction Z. The end cap patches 12 have a length direction extending in a first direction X, a width direction extending in a second direction Y, and a thickness direction extending in a third direction Z.

In other embodiments, the housing 111 may be a cylinder or an elliptical cylinder, and the end cap 112 may be a circular or elliptical plate-shaped structure.

Fig. 4 illustrates a schematic diagram of a cell according to some embodiments of the present application (components inside the cell are not shown); FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4; fig. 6 is a partially enlarged view of fig. 5 at B.

As shown in fig. 3, 4, 5, and 6, some embodiments of the present application provide a battery cell 10 including a case 111, an end cap 112, an end cap patch 12, an insulating film 13, and a first adhesive layer 16. The housing 111 has an opening, the end cap 112 covers the opening, and the end cap patch 12 is arranged on a side of the end cap 112 facing away from the interior of the housing 111. The insulating film 13 includes a main body portion 131 and a flange portion 132, the main body portion 131 is wrapped around the outer surface of the housing 111, and the flange portion 132 is disposed between the end cap 112 and the end cap patch 12. The first layer of glue 16 comprises a first portion 161 and a second portion 162 arranged consecutively, the first portion 161 being arranged around the second portion 162, the first portion 161 being arranged between the cuff 132 and the end cap patch 12, the first portion 161 being arranged for adhering the cuff 132 to the end cap patch 12, the second portion 162 being arranged between the end cap 112 and the end cap patch 12, the second portion 162 being arranged for adhering the end cap 112 to the end cap patch 12. Wherein the thickness of the first portion 161 is less than the thickness of the second portion 162.

The insulating film 13 may be provided with one, a main body portion 131 of the insulating film 13 circumferentially wrapping the outer surface of the housing 111, and a cuff portion 132 folded inward along the edge of the end cap 112 so as to be circumferentially provided between the end cap 112 and the end cap patch 12; the insulating films 13 may be provided in plurality, the main body portions 131 of the insulating films 13 collectively circumferentially cover the outer surface of the housing 111, the main body portions 131 of two adjacent insulating films 13 are connected in a spliced manner, the flanged portions 132 of the insulating films 13 are circumferentially spaced along the edge of the end cap 112, and the connecting portions of the flanged portions 132 of two adjacent insulating films 13 are stacked.

As shown in fig. 5, the outer surface of the housing 111 includes a side 1111 and a bottom 1112, and the side 1111 surrounds the bottom 1112. The main body 131 of the insulating film 13 may cover both the side surface 1111 and the bottom surface 1112 of the housing 111, and the side of the main body 131 away from the flanging part 132 may be folded back to the bottom surface 1112 of the housing 111 to cover the bottom surface 1112 of the housing 111; the main body 131 of the insulating film 13 may cover only the side surface 1111 of the housing 111, and a separate insulating member may be provided to insulate the bottom surface 1112 of the shield housing 111.

The first adhesive layer 16 may be a preformed component, for example, the first adhesive layer 16 may be a double-sided adhesive that conforms the end cap patch 12 to the surface of the end cap 112 in an assembled form; the first adhesive layer 16 may also be formed after the liquid adhesive is cured, for example, by applying the liquid adhesive to the surface of the end cap 112, placing the end cap patch 12 on the end cap 112 coated with the liquid adhesive, and adjusting the position of the end cap patch 12 relative to the end cap 112 to be suitable, and the liquid adhesive is cured to bond the end cap patch 12 to the end cap 112. The shape of the first layer of glue 16 matches the shape of the end cap 112. The first paste layers 16 extend in the first direction X in the longitudinal direction, in the second direction Y in the width direction, and in the third direction Z in the thickness direction.

As shown in fig. 3 and 5, a side of the end cap 112 facing away from the interior of the housing 111 is a first side 1123, the end cap patch 12 is disposed on the first side 1123 of the end cap 112, and the first glue layer 16 is disposed between the first side 1123 of the end cap 112 and the end cap patch 12 to adhere the end cap patch 12 to the end cap 112.

As shown in fig. 6, the first portion 161 refers to the portion of the first adhesive layer 16 disposed between the cuff 132 and the end cap patch 12, and the second portion 162 refers to the portion connected to the first portion 161. The thickness of the first portion 161 is H1, the thickness of the second portion 162 is H2, H1 is less than H2, and one end of the second portion 162 is connected to the first portion 161, and the other end extends toward the middle of the first glue layer 16. The junction of the first portion 161 and the second portion 162 may form a step to achieve a variation in the thickness of the first glue layer 16; the junction of first portion 161 and second portion 162 may also be provided with a transition portion having one end connected to first portion 161 and a thickness of H1, and another end connected to second portion 162 and a thickness of H2.

The end cap patch 12 and the first adhesive layer 16 are each provided with an opening for exposing the electrode terminal 14 and the pressure relief 15. The end cap patch 12 includes three openings, and the three openings correspond to the two electrode terminals 14 and the pressure relief member 15, so as to reduce the opening area of the end cap patch 12 and improve the insulation protection effect on the end cap 112. The first adhesive layer 16 is disposed between the end cap 112 and the end cap patch 12, and the first adhesive layer 16 may have an opening to expose the electrode terminal 14 and the pressure relief element 15, or may be disposed in an opening corresponding to the opening of the end cap patch 12, so as to better fill the gap between the end cap 112 and the end cap patch 12 and reduce the stress non-uniformity of the end cap patch 12.

The end cap 112 matches the shape of the end cap patch 12. For example, where the end cap 112 is a flat plate structure, the end cap patch 12 is also a flat plate structure; when the end cap 112 has a plate-like structure with protrusions or recesses on the surface, the end cap patch 12 also has a plate-like structure with protrusions or recesses on the surface.

In the battery cell 10 according to the embodiment of the present application, since the cuff 132 is provided between the end cap 112 and the end cap patch 12, the gap between the cuff 132 and the end cap patch 12 is smaller than the gap between the end cap 112 and the end cap patch 12. The thickness of the first portion 161 is H1 and is less than the thickness H2 of the second portion 162, can adapt to the difference of the distances between the end cover patch 12 and the end cover 112 and between the end cover patch 12 and the flanging part 132, so that the stress is uniform when the end cover patch 12 is bonded with the flanging part 132 and the end cover 112, the edge of the end cover patch 12 is not easily separated from the end cover 112, further, the flanging part 132 is prevented from being tilted up from the end cover 112, the distance of the inward extension of the flanging part 132 along the edge of the end cover 112 is ensured, the creepage distance of the battery single cells 10 is ensured, and therefore, when two adjacent battery single cells 10 are connected in series, the shells 11 of the two battery single cells 10 are effectively insulated and isolated, and the safety performance of the battery 100 is improved.

As shown in fig. 6, in some embodiments of the present application, the first portion 161 has a first surface 1611 facing the end cap patch 12, the second portion 162 has a second surface 1621 facing the end cap patch 12, and the first surface 1611 is flush with the second surface 1621.

The first surface 1611 being flush with the second surface 1621 means that the junction of the first and

second surfaces

1611 and 1621 is smooth and without steps. Specifically, the first portion 161 also has a third surface 1612 facing the end cap 112, and the second portion 162 also has a fourth surface 1622 facing the end cap 112. The first surface 1611 is flush with the second surface 1621, the fourth surface 1622 protrudes from the third surface 1612, and a step is formed between the third surface 1612 and the fourth surface 1622, so that the thickness H1 of the first portion 161 is smaller than the thickness H2 of the second portion 162.

In the above solution, the first surface 1611 and the second surface 1621 are flush and are bonded to the surface of the end cap patch 12 facing the end cap 112, so that the stress unevenness of the end cap patch 12 is reduced, and the separation of the edge of the end cap patch 12 from the end cap 112 due to the stress unevenness can be avoided.

In some embodiments of the present application, the sum of the thickness H1 of the first portion 161 and the thickness H of the cuff 132 is equal to the thickness H2 of the second portion 162.

Specifically, as shown in fig. 6, one side of the flange 132 is attached to the end cap 112, and the other side is attached to the first portion 161. The sum of the thickness H1 of the first portion 161 plus the thickness H of the upper flange portion 132 is equal to the thickness H2 of the second portion 162, i.e., H2 — H1+ H.

In the above arrangement, the first portion 161 can fill the gap between the cuff 132 and the end cap patch 12, and the second portion 162 can fill the gap between the end cap 112 and the end cap patch 12, so that the end cap 112 and the end cap patch 12 are bonded together by the first adhesive layer 16 without stress.

As shown in fig. 5 and 6, in some embodiments of the present application, the end cover 112 includes an end cover body 1121 and a first protrusion 1122, the end cover body 1121 is disposed around the first protrusion 1122, the first protrusion 1122 protrudes from the end cover body 1121 in a direction away from the inside of the housing 111, and the cuff 132, the first portion 161, and the second portion 162 are disposed between the end cover body 1121 and the end cover patch 12.

FIG. 7 shows an enlarged view of a portion of FIG. 5 at C; fig. 8 illustrates a schematic diagram of an end cap patch for a cell according to some embodiments of the present application.

As shown in fig. 6, 7, and 8, the end cap patch 12 includes a flat portion 123 and a groove 124, the groove 124 is recessed in a direction away from the end cap 112, the flat portion 123 is disposed corresponding to the end cap body 1121 of the end cap 112, the groove 124 is disposed corresponding to the first protrusion 1122 of the end cap 112, and the first protrusion 1122 is received in the groove 124.

The first protrusion 1122 is provided with the electrode terminal 14 and the pressure relief 15 (see fig. 3), and the cap body 1121 is provided for being connected to the case 111 and being attached to the flange 132.

In the above solution, the first protrusion 1122 protrudes away from the inside of the case 111, so that more space can be provided on the side of the end cap 112 facing the inside of the battery cell 10 to accommodate the components disposed on the end cap 112, and the electrode assembly can be disposed in more space inside the case 111, thereby increasing the energy density of the battery cell 10; and the flanging part 132, the first part 161 and the second part 162 are all arranged between the end cover body 1121 and the end cover patch 12, so that not only can the parts arranged on the end cover 112 be avoided, but also the structure of the first adhesive layer 16 can be simplified.

As shown in fig. 6, in some embodiments of the present application, first layer of adhesive 16 further includes a third portion 163 disposed continuously with second portion 162, third portion 163 disposed between first protrusion 1122 and end cap patch 12.

As shown in fig. 6, a side of the third portion 163 facing the end cap patch 12 includes a fifth surface 1631, a side facing the first convex portion 1122 includes a sixth surface 1632, and the sixth surface 1632 is attached and adhered to the first convex portion 1122. The thickness of the third portion 163 of the first adhesive layer 16 corresponds to the gap between the first protrusion 1122 and the end cap patch 12, the shape of the fifth surface 1631 of the third portion 163 corresponds to the shape of the groove 124 of the end cap patch 12, and the shape of the sixth surface 1632 corresponds to the shape of the first protrusion 1122.

One end of the third portion 163 is connected to the second portion 162, and the other end may completely cover the first protrusion 1122 and be provided with an opening corresponding to the cap patch 12, so that the electrode terminal 14 and the pressure relief 15 are exposed outside the cap patch 12; the other end of the third portion 163 may also enclose an opening to expose the electrode terminal 14 and the pressure relief element 15 to the outside of the end cap patch 12.

In the above configuration, the third portion 163 can fill the gap between the first protrusion 1122 and the end cap patch 12, so that the internal stress is uniform when the end cap patch 12 is bonded to the end cap 112, thereby reducing the possibility of the edge of the end cap patch 12 being lifted.

As shown in fig. 5 and 6, in some embodiments of the present application, the first protrusion 1122 includes a top wall 11222 and a side wall 11221, the side wall 11221 surrounds the top wall 11222, the side wall 11221 connects the top wall 11222 and the end cap body 1121, and the third portion 163 is disposed between the side wall 11221 and the end cap patch 12.

The members such as the pressure relief member 15 and the electrode terminal 14 are disposed on the first protrusions 1122, and the third portion 163 of the first adhesive layer 16 fills the gap between the side wall 11221 and the groove 124 of the end cap patch 12.

The top wall 11222 and the end cap body 1121 may be disposed in parallel, and the top wall 11222 and the end cap body 1121 may also be disposed obliquely; the top wall 11222 and the side wall 11221 may be vertically disposed, and the top wall 11222 and the side wall 11221 may be disposed at an obtuse angle.

In the above configuration, the third portion 163 bonds the side wall 11221 of the first protrusion 1122 to the end cap patch 12, and not only avoids the member provided on the top wall 11222 but also fills the gap between the side wall 11221 and the end cap patch 12, thereby making the internal stress of the end cap patch 12 uniform when it is bonded to the end cap 112.

As shown in fig. 6 and 7, in some embodiments of the present application, the first protrusion 1122 includes a top wall 11222 and a side wall 11221, the side wall 11221 surrounds the top wall 11222, and the side wall 11221 connects the top wall 11222 and the end cap body 1121. The end cap patch 12 comprises a patch body 121 and a second layer of adhesive 122, the second layer of adhesive 122 being located on the side of the patch body 121 facing said end cap 112, the second layer of adhesive 122 being adapted to bond the top wall 11222 to the patch body 121.

The second adhesive layer 122 may be a double-sided adhesive. The second adhesive layer 122 may bond only the top wall 11222 to the chip body 121, or may bond the top wall 11222 to the chip body 121 and also bond the side wall 11221 to the chip body 121; the second adhesive layer 122 may bond only the first convex portions 1122 to the chip main body 121, or may bond the first convex portions 1122 to the chip main body 121 and further bond the first adhesive layer 16 to the chip main body 121.

Openings corresponding to the electrode terminals 14 and the pressure relief members 15 (shown in fig. 3) are formed in the patch body 121, and openings corresponding to the via holes of the patch body 121 are formed in the second adhesive layer 122.

In the above-described embodiment, the second adhesive layer 122 is provided on the side of the patch body 121 facing the end cap 112, and the second adhesive layer 122 connects the top wall 11222 of the first protrusion 1122 to the patch body 121 of the end cap patch 12, thereby further firmly bonding the end cap patch 12 to the end cap 112.

In some embodiments of the present application, the second layer of adhesive 122 covers the side of the patch body 121 facing the end cap 112, the second layer of adhesive 122 being at least partially located between the first layer of adhesive 16 and the patch body 121.

The side of the patch body 121 facing the end cap 112 covered by the second adhesive layer 122 means that the edge of the second adhesive layer 122 is aligned with the edge of the patch body 121, and the opening of the second adhesive layer 122 is disposed corresponding to the opening of the patch body 121, and the projection outlines of the second adhesive layer 122 and the patch body 121 are the same in the XY plane.

The second adhesive layer 122 may be entirely disposed between the first adhesive layer 16 and the patch body 121, or a portion of the second adhesive layer 122 may be disposed between the first adhesive layer 16 and the patch body 121, and another portion of the second adhesive layer may be disposed between the first protrusion 1122 and the patch body 121.

In the above scheme, the second adhesive layer 122 is further used for bonding the first adhesive layer 16 and the patch body 121, so that the second adhesive layer 122 covers the patch body 121 comprehensively when the end cover patch 12 is machined and formed, and then the end cover patch 12 is punched, thereby simplifying the manufacturing process of the end cover patch 12.

As shown in fig. 6, 7 and 8, in some embodiments of the present application, the second layer of glue 122 comprises a fourth portion 1221 and a fifth portion 1222, the fourth portion 1221 being disposed around the fifth portion 1222, the fourth portion 1221 being located between the first layer of glue 16 and the patch body 121, and the fifth portion 1222 being located between the top wall 11222 and the patch body 121.

The fifth portion 1222 is recessed towards the direction away from the end cap 112 to match the shape of the second layer of glue 122 to the patch body 121.

The fourth portion 1221 and the fifth portion 1222 may have the same thickness, and the fourth portion 1221 and the fifth portion 1222 are integrally formed; the thicknesses of the fourth portion 1221 and the fifth portion 1222 may not be limited, and the fourth portion 1221 and the fifth portion 1222 may be separately provided.

In the above arrangement the fourth portion 1221 of the second layer of glue 122 is used to bond the first layer of glue 16 to the patch body 121, the fifth portion 1222 is used to bond the top wall 11222 to the patch body 121, and the fourth portion 1221 and the fifth portion 1222 together fill the gap between the patch body 121 and the end cap 112 to improve the stress uniformity when the patch body 121 is bonded to the end cap 112.

FIG. 9 shows a cross-sectional view D-D of FIG. 4; fig. 10 shows a partial enlarged view at E in fig. 9.

As shown in fig. 8, 9 and 10, in some embodiments of the present application, the first adhesive layer 16 is a thermal conductive adhesive, the end cap patch 12 is provided with a through hole 125, the first adhesive layer 16 further includes a second protrusion 164, the second protrusion 164 protrudes in a direction away from the end cap 112, and the second protrusion 164 fills the through hole 125.

Specifically, the second protrusion 164 may be formed on the first surface 1611 of the first portion 161, the second surface 1621 of the second portion 162, or a connection portion between the first surface 1611 and the second surface 1621.

The number of the through holes 125 of the end cap patch 12 may be one, and one through hole 125 is disposed in the flat portion 123 of the end cap patch 12; the end cap patch 12 may also have two sets of through holes 125, where the two sets of through holes 125 are oppositely disposed on the flat portion 123 along the first direction X and are respectively located at two sides of the groove 124, and each set of through holes 125 includes at least one through hole 125.

The end of the second protrusion 164 may be flush with the surface of the side of the patch end cap 12 facing away from the end cap 112, or may be raised or recessed into the surface of the side of the patch end cap 12 facing away from the end cap 112.

In the above scheme, the first adhesive layer 16 is attached to the end cap 112 in a heat conducting manner, and the temperature of the second protrusion 164 can represent the temperature of the end cap 112, so that the second protrusion 164 is connected to an external temperature sampling component to collect the temperature of the end cap 112, monitor the operating state of the battery cell 10, and improve the safety performance of the battery cell 10.

FIG. 11 is a sectional view taken along line F-F of FIG. 4; FIG. 12 is an enlarged view of a portion of FIG. 11 at G;

as shown in fig. 11, 12 and 13, in some embodiments of the present application, the end cap 112 has a rectangular shape, the flange portion 132 has an overlapping region at four corners of the end cap 112, and notches 165 for avoiding the overlapping region are provided at the four corners of the first adhesive layer 16.

Specifically, the notch 165 is disposed in the first portion 161 of the first glue layer 16; the flanged portion 132 includes a first flange 1321, a second flange 1322, a third flange 1323, and a fourth flange 1324, and the first flange 1321, the second flange 1322, the third flange 1323, and the fourth flange 1324 correspond to four edges of the end cover 112, respectively. The first flange 1321 and the third flange 1323 both extend along the first direction X and are arranged oppositely along the second direction Y; the second flange 1322 and the fourth flange 1324 both extend along the second direction Y and are disposed opposite to each other along the first direction X.

It will be appreciated that the thickness h of the flange portion 132 refers to the thickness of a single-layer flange, i.e., the thickness of the first flange 1321, the second flange 1322, the third flange 1323, or the fourth flange 1324. The thickness W of the overlapping area 1325 is larger than h, and the thickness W of the overlapping area 1325 may be twice or three times the thickness h of the burring 132 depending on the molding manner of the insulating film 13.

As shown in FIGS. 12 and 13, taking the connection between the first flange 1321 and the second flange 1322 as an example, the first flange 1321 and the second flange 1322 are stacked to form an overlapping area 1325, and the thickness of the overlapping area 1325 is greater than the thickness of the first flange 1321 or the second flange 1322. Based on the foregoing embodiment in which "one insulating film 13 is provided, and the burring 132 is folded inward along the edge of the end cover 112", the thickness W of the overlap region 1325 is equal to the sum of the thickness of the first burring 1321 and the thickness of the second burring 1322, that is, W is 2 h. Based on the aforementioned embodiment that a plurality of insulating films 13 are provided, the flanged portions 132 of the insulating films 13 are provided at intervals along the circumferential direction of the edge of the end cap 112, and the joints of the flanged portions 132 of two adjacent insulating films 13 are laminated, the thickness W of the overlapping region 1325 is equal to the sum of the thicknesses of the first flange 1321 and the second flange 1322 and the thickness of the inner fold, wherein the thickness of the inner fold is the same as the thickness of the single-layer flange, that is, W is 3 h.

In the above solution, the thickness of the overlapping area of the flanging portion 132 is greater than that of the rest area, the notches at the four corners of the first adhesive layer 16 can avoid the overlapping area of the flanging portion 132, and the overlapping area is partially accommodated in the notches, so that the stress is uniform when the end cover patch 12 is adhered to the end cover 112.

As shown in fig. 8, 12 and 13, in some embodiments of the present application, the side of the end cap patch 12 facing said end cap 112 is provided with a recess 126, the recess 126 being provided in correspondence with the overlap region 1325.

The recess 126 may extend through the patch 12 in the thickness direction of the patch 12, or may be recessed from the side of the patch 12 facing the end cap 112. For example, the end corner of the second adhesive layer 122 corresponding to the overlapping area 1325 has an opening, the opening forms the recess 126, and the overlapping area 1325 fills the opening of the second adhesive layer 122 and abuts against the side surface of the patch body 121 facing the end cap 112. For another example, on the basis that the corner of the second adhesive layer 122 has an opening, the surface of the side of the patch body 121 facing the end cap 112 is further recessed to form a thinned region, and the opening of the second adhesive layer 122 and the thinned region of the patch body 121 together form the recess 126. For another example, the patch body 121 is provided with an opening corresponding to the opening of the second adhesive layer 122, the opening of the patch body 121 penetrates through the patch body 121 along the thickness direction thereof, the opening of the patch body 121 and the opening of the second adhesive layer 122 together form a recess 126, and the overlapping area 1325 fills the recess 126 and exposes a side surface of the end cap patch 12 facing away from the end cap 112.

In the above-described aspect, the end cap patch 12 has the concave portion 126 corresponding to the overlapping area 1325 of the cuff 132, so that the overlapping area of the cuff 132 can be further avoided, uneven end angle stress of the patch body 121 corresponding to the overlapping area 1325 can be avoided, the distance between the end cap patch 12 and the end cap 112 can be reduced, the degree of protrusion of the end cap patch 12 from the end cap 112 can be reduced, and the outer size of the battery cell 10 provided with the end cap patch 12 can be reduced.

Some embodiments of the present application provide a battery 100 including a battery cell 10 provided by some embodiments of the present application.

The battery 100 of some embodiments of the present application also has superior safety performance due to the characteristics of the battery cell 10 of some embodiments of the present application.

Some embodiments of the present application provide an electric device including a battery 100 provided in some embodiments of the present application, the battery 100 being used to provide electric energy.

The electric device according to some embodiments of the present application also has superior safety performance due to the characteristics of the battery cell 10 according to some embodiments of the present application.

Fig. 14 illustrates a schematic of a method of manufacturing a battery cell according to some embodiments of the present application.

As shown in fig. 14, some embodiments of the present application provide a method of manufacturing a battery cell, including:

s100: providing a housing 111 and an end cap 112, the housing 111 having an opening;

s200: covering the opening with an end cap 112;

s300: providing an insulating film 13;

s400: coating the main body part 131 of the insulating film 13 on the outer surface of the shell 111, and coating the flanging part 132 of the insulating film 13 on the side of the end cover 112, which is far away from the interior of the shell 111;

s500: providing an end cap patch;

s600: the end cap patch 12 is adhered to the side of the end cap 112 facing away from the interior of the housing 111 by the first adhesive layer 16, the first adhesive layer 16 includes a first portion 161 and a second portion 162 which are continuously disposed, the first portion 161 is disposed around the second portion 162, the first portion 161 is disposed between the cuff 132 and the end cap patch 12 and adheres the cuff 132 to the end cap patch 12, the second portion 162 is disposed between the end cap 112 and the end cap patch 12 and adheres the end cap 112 to the end cap patch 12, and the thickness of the first portion 161 is smaller than that of the second portion 162.

Fig. 15 shows a schematic view of a manufacturing apparatus of a battery cell of some embodiments of the present application.

As shown in fig. 15, some embodiments of the present application provide a manufacturing apparatus 2000 of a battery cell, including:

a first providing device 2100 for providing a housing 111 and an end cap 112, the housing 111 having an opening;

a second supplying means 2200 for supplying the insulating film 13;

a third providing device 2300 for providing the end cap patch 12;

a first assembly module 2400 for covering the end cap 112 on the opening;

the second assembly module 2500 is used for coating the main body part 131 of the insulating film 13 on the outer surface of the shell 111 and coating the flanging part 132 of the insulating film 13 on the side, away from the interior of the shell 111, of the end cover 112;

the third assembly module 2600 is configured to adhere the end cap patch 12 to a side of the end cap 112 facing away from the inside of the housing 111 through the first adhesive layer 16, where the first adhesive layer 16 includes a first portion 161 and a second portion 162 that are continuously disposed, the first portion 161 is disposed around the second portion 162, the first portion 161 is disposed between the flange portion 132 and the end cap patch 12 and adheres the flange portion 132 to the end cap patch 12, the second portion 162 is disposed between the end cap 112 and the end cap patch 12 and adheres the end cap 112 to the end cap patch 12, and a thickness of the first portion 161 is smaller than a thickness of the second portion 162.

As shown in fig. 1 to 15, some embodiments of the present application provide a battery cell 10 including a case 111, an end cap 112, an end cap patch 12, an insulating film 13, and a first adhesive layer 16. The end cover patch 12 includes a patch body 121 and a second adhesive layer 122, the second adhesive layer 122 is disposed on the inner side of the patch body 121, the insulating film 13 includes a main body portion 131 and a flange portion 132, the main body portion 131 covers the outer surface of the housing 111, the flange portion 132 is folded to the outer surface of the end cover 112, the end cover patch 12 is bonded to the outer surface of the end cover 112 through the first adhesive layer 16, and the flange portion 132 is pressed to the outer surface of the end cover 112. The first glue layer 16 includes a first portion 161, a second portion 162 and a third portion 163. The first portion 161 is disposed around the second portion 162, the thickness H1 of the first portion 161 is less than the thickness H2 of the second portion 162, and the thickness H2 of the second portion 162 is equal to the sum of the thickness H1 of the first portion 161 and the thickness H of the cuff 132. One end of the third portion 163 extends from the second portion 162, the third portion 163 is disposed around the side wall 11221 of the first protrusion 1122 of the end cap 112 and bonds the end cap patch 12 to the side wall 11221; the top wall 11222 of the first protrusion 1122 is bonded to the end cap patch 12 by the second layer of adhesive 122.

There are overlapping areas 1325 at the four corners of the cuff portion 132, and the thickness W of the overlapping area 1325 is equal to two or three times the thickness h of the cuff portion 132 of a single layer depending on the forming process of the particular cuff portion 132. The corners of the first portion 161 of the first layer of adhesive 16 may be provided with notches 165 corresponding to the overlap 1325 to allow the surface of the overlap 1325 to conform to the end cap patch 12. For example, when W is 2H and the thickness H1 of the first portion 161 is H, the thickness H2 of the second portion 162 is H1+ H is 2H, and the overlapping area 1325 fills the gap 165 and abuts the inner surface of the end cap patch 12.

Further, the end cap patch 12 may also be provided with a recess 126 corresponding to the notch 165 to further avoid stress on the portion of the end cap patch 12 that overlaps the area 1325. For example, when W is 3H and the thickness H1 of the first portion 161 is H, the thickness H2 of the second portion 162 is 2H, the thickness H of the second adhesive layer 122 is H, the corners of the second adhesive layer 122 have openings corresponding to the shape of the overlapping area 1325, i.e., the recesses 126 of the end cap patch 12, and then the overlapping area 1325 further fills the recesses 126 after filling the notches 165, and the surface of the overlapping area 1325 abuts against the inner surface of the patch body 121.

In the single battery cell 10 according to some embodiments of the present application, since the thickness H1 of the first portion 161 of the first adhesive layer 16 is smaller than the thickness H2 of the second portion 162, the end corner of the first adhesive layer 16 is provided with the notch 165 corresponding to the overlapping area 1325, and the end corner of the second adhesive layer 122 is provided with the recess 126 corresponding to the overlapping area 1325, the gap between the patch body 121 and the end cap 112 can be filled according to the surface shape of the flange 132, a stress concentration phenomenon is not generated after the patch body 121 is bonded to the end cap 112 through the first adhesive layer 16 and the second adhesive layer 122, and the edge of the patch body 121 does not warp after long-time use. Therefore, the flanging part 132 can be reliably pressed on the outer surface of the end cover 112, and the creepage distance of the single battery 10 is ensured not to be reduced after long-time use, so that the single battery 10 has better insulating property and safety property when being connected in series and adjacently arranged.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, comprising:

a housing having an opening;

an end cap covering the opening;

the end cover patch is arranged on one side of the end cover, which is far away from the interior of the shell;

the insulating film comprises a main body part and a flanging part, the main body part is coated on the outer surface of the shell, and the flanging part is arranged between the end cover and the end cover patch; and

a first layer of adhesive comprising a first portion and a second portion disposed in series, the first portion disposed around the second portion, the first portion disposed between the cuff and the end cap patch, the first portion configured to bond the cuff and the end cap patch, the second portion disposed between the end cap and the end cap patch, the second portion configured to bond the end cap and the end cap patch;

wherein the thickness of the first portion is less than the thickness of the second portion.

2. The battery cell of claim 1, wherein the first portion has a first surface facing the end cap patch and the second portion has a second surface facing the end cap patch, the first surface being flush with the second surface.

3. The battery cell as recited in claim 1 wherein the sum of the thickness of the first portion and the thickness of the cuff is equal to the thickness of the second portion.

4. The battery cell of claim 1, wherein the end cap comprises an end cap body and a first protrusion, the end cap body disposed around the first protrusion, the first protrusion protruding from the end cap body in a direction away from an interior of the housing, the cuff, the first portion, and the second portion each disposed between the end cap body and the end cap patch.

5. The battery cell of claim 4, wherein the first adhesive layer further comprises a third portion disposed contiguous with the second portion, the third portion disposed between the first protrusion and the end cap patch.

6. The battery cell of claim 5, wherein the first protrusion comprises a top wall and a side wall, the side wall being disposed around the top wall, the side wall connecting the top wall and the end cap body, the third portion being disposed between the side wall and the end cap patch.

7. The battery cell of claim 4, wherein the first protrusion comprises a top wall and a side wall, the side wall being disposed around the top wall, the side wall connecting the top wall and the end cap body;

the end cover paster comprises a paster body and a second adhesive layer, the second adhesive layer is located on one side, facing the end cover, of the paster body, and the second adhesive layer is used for bonding the top wall with the paster body.

8. The battery cell as recited in claim 7 wherein the second layer of adhesive covers a side of the patch body facing the end cap, the second layer of adhesive being at least partially between the first layer of adhesive and the patch body.

9. The battery cell as recited in claim 8, wherein the second adhesive layer comprises a fourth portion and a fifth portion, the fourth portion being disposed around the fifth portion, the fourth portion being disposed between the first adhesive layer and the patch body, and the fifth portion being disposed between the top wall and the patch body.

10. The battery cell according to any one of claims 1-9, wherein the first adhesive layer is a thermally conductive adhesive, the end cap patch has a through hole formed therein, the first adhesive layer further comprises a second protrusion protruding away from the end cap, and the second protrusion fills the through hole.

11. The battery cell as recited in any one of claims 1 to 9, wherein the end cap is rectangular, the flange portion has an overlapping region at four corners of the end cap, and notches are provided at the four corners of the first adhesive layer for avoiding the overlapping region.

12. The battery cell as recited in claim 11 wherein a side of the end cap patch facing the end cap is provided with a recess corresponding to the overlap region.

13. A battery comprising a cell according to any one of claims 1 to 12.

14. An electrical device comprising a battery as claimed in claim 13 for providing electrical energy.