Cells and electrical devices containing them

Abstract

To provide a cell and an electrical device including the same.SOLUTION: A cell includes a housing, a first electrode terminal, an electrode assembly 130, and a heat shrinkable insulating film 140. The housing includes an end wall and a side wall surrounding the end wall. The first electrode terminal is attached penetrating through the end wall by an insulating method. The electrode assembly is sealed and attached inside the housing, a first end of the electrode assembly includes a first tab, and the first tab is electrically connected to the first electrode terminal. The heat shrinkable insulating film covers at least a peripheral surface that is close to the first end of the electrode assembly so that the first tab is insulated from the side wall. Here, the heat shrinkable insulating film is connected as a closed loop and a bonding region is provided on the peripheral surface of the heat shrinkable insulating film.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to the technical field of batteries, and in particular to cells and electrical devices containing same. [Background technology]

[0002] All-tab cylindrical cells have attracted the attention of many new energy manufacturers due to their unique excellent conductivity and ultra-low internal resistance. Cylindrical cell housings are typically made of conductive materials such as aluminum or steel, and tab insulation is crucial for all-tab cylindrical cells. The existing insulating layer between the tab and the housing is typically PET insulating tape. The insulating tape is then wrapped around the positive and / or negative electrode tabs, and then pressed and attached to the end faces of the tabs facing the housing, insulating and isolating the tabs from the side walls of the housing. However, this process requires pressing the tape attached to the outer wall of the electrode assembly against the end faces, which typically results in wrinkles in the insulating tape. This can easily lead to interference with the housing. Furthermore, after the cell has been used for a long time, the tape is immersed in the electrolyte, which can easily cause the wrinkles at the pressed points of the tape to curl up, resulting in poor insulation. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of the above-mentioned drawbacks of the related art, the present invention provides a cell and an electrical device including the same to address the problem that wrinkles in the insulating tape of the tab in existing batteries tend to curl up, causing insulation failure. [Means for solving the problem]

[0004] To achieve the above and other related objects, a first aspect of the present invention provides a cell. The housing includes an end wall and a side wall surrounding the end wall. A first electrode terminal is mounted through the end wall in an insulating manner. An electrode assembly is hermetically mounted within the housing, and a first end of the electrode assembly includes a first tab, which is electrically connected to the first electrode terminal. A heat-shrinkable insulating film wraps around at least a periphery of the electrode assembly near the first end so as to insulate the first tab from the side wall. The heat-shrinkable insulating film is connected as a closed loop, and a bonding area is provided on the periphery of the heat-shrinkable insulating film.

[0005] In a cell provided according to one embodiment of the present invention, the bonding region comprises a thermocompression bonded region and / or an adhesive bonded region.

[0006] In a cell provided according to one embodiment of the present invention, the bonding region includes an overlapping region, the overlapping width of which is 3 mm or less, and the thickness of the heat-shrinkable insulating film other than the overlapping region is 0.03 mm to 0.06 mm.

[0007] In a cell provided according to one embodiment of the present invention, the heat-shrinkable insulating film is made of polyethylene terephthalate (PET) or polyethylene terephthalate-co-1,4-cyclohexylene dimethylene terephthalate (PETG).

[0008] In a cell according to one embodiment of the present invention, the heat-shrinkable insulating film includes a side wall portion covering at least a peripheral surface of the electrode assembly near a first end thereof, and an end wall portion at least partially covering an edge of the first end thereof.

[0009] In a cell provided according to one embodiment of the present invention, an adhesive layer is provided on at least a portion of the contact surface between the side wall portion and the electrode assembly.

[0010] In a cell provided according to one embodiment of the present invention, an adhesive layer is provided on the inner surface of the side wall portion and is arranged along the circumferential direction of the side wall portion.

[0011] In a cell provided according to one embodiment of the present invention, the sidewall portion wraps around the entire periphery of the electrode assembly, and the adhesive layer covers an area of ​​the sidewall portion corresponding to the entire periphery of the electrode assembly.

[0012] In a cell provided according to one embodiment of the present invention, the first tab is a positive electrode tab, and the positive electrode tab includes a plurality of metal conductive sheets.

[0013] In a cell according to one embodiment of the present invention, the first tab is electrically connected to the first electrode terminal via the current collector plate. A heat-shrinkable insulating film is provided, wrapping the peripheral edge surface of the current collector plate and having a through-hole formed at a position corresponding to the first electrode terminal. The electrical connector of the current collector plate is electrically connected to the first electrode terminal through the through-hole.

[0014] In a cell provided according to one embodiment of the present invention, the ratio of the length of the heat-shrinkable insulating film covering the end faces of the electrode assembly to the length of the heat-shrinkable insulating film covering the peripheral side walls of the electrode assembly is 1 / 3 to 2 / 3.

[0015] A second aspect of the present invention further provides an electric device, the electric device comprising an operating part and a cell according to the above, the operating part being electrically connected to the cell to obtain power support. [Effects of the Invention]

[0016] In the cell provided by the present invention, a bonding area is provided on the periphery of the heat-shrinkable insulating film. This allows the strip-shaped heat-shrinkable insulating film to be connected at both ends, and then it is further heated and heat-shrunk to wrap around the periphery of the first end of the electrode assembly so as to insulate the first tab from the side wall of the housing. This structural configuration allows a relatively smooth coating layer to be formed on the periphery where the first tab is located. Furthermore, a heat-shrinkable insulating film having this type of structure can be directly manufactured from a strip-shaped film body and is not affected by the demolding process of a cylindrical heat-shrinkable sleeve. This allows for a thinner thickness, solving the problems associated with thick heat-shrinkable films in the related art, reducing warping, and providing good insulation reliability and feasibility. The electrical device provided by the present invention uses the cell provided by the present invention to supply power, thereby providing improved reliability. [Brief explanation of the drawings]

[0017] In order to more clearly present the technical solutions provided in the embodiments of the present invention or related technologies, some accompanying drawings required in the embodiments or related technologies are briefly introduced below. Of course, the drawings in the following description are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without inventive efforts.

[0018] [Figure 1] 1 is a three-dimensional schematic diagram of a cell according to one embodiment of the present invention. [Figure 2] FIG. 2 is a three-dimensional schematic diagram of a cell with its housing removed, according to one embodiment of the present invention. [Figure 3] 1 is an enlarged view of the bonded area of ​​the heat-shrinkable insulating film in a cell according to one embodiment of the present invention. [Figure 4] FIG. 2 is a schematic structural diagram of a heat-shrinkable insulating film in an initial state in a cell according to one embodiment of the present invention. [Figure 5] FIG. 2 is a schematic diagram of a heat-shrinkable insulating film after bonding in a cell according to one embodiment of the present invention. [Figure 6]FIG. 1 is a schematic diagram of an attachment process for applying a heat-shrinkable insulating film onto a bonded electrode assembly in a cell according to one embodiment of the present invention. [Figure 7] FIG. 2 is a schematic diagram of a heat-shrinkable insulating film after being attached to an electrode assembly in a cell according to one embodiment of the present invention. [Figure 8] FIG. 2 is a schematic diagram of a heat-shrinkable insulating film heat-shrunk onto an electrode assembly in a cell according to one embodiment of the present invention. [Figure 9] FIG. 2 is a schematic diagram of the initial structure of a heat-shrinkable insulating film in a cell according to another embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram of an attachment process for attaching a heat-shrinkable insulating film to an electrode assembly in a cell according to another embodiment of the present invention. [Figure 11] FIG. 10 is a schematic diagram of a heat-shrinkable insulating film after being attached to an electrode assembly in a cell according to another embodiment of the present invention. [Figure 12] FIG. 10 is a schematic diagram of a heat-shrinkable insulating film heat-shrunk onto an electrode assembly in a cell according to another embodiment of the present invention. [Figure 13] FIG. 10 is a schematic diagram of the initial state of a heat-shrinkable insulating film in a cell according to yet another embodiment of the present invention. [Figure 14] FIG. 10 is a schematic diagram of a heat-shrinkable insulating film after being attached to an electrode assembly in a cell according to yet another embodiment of the present invention. [Figure 15] FIG. 10 is a schematic diagram of a heat-shrinkable insulating film heat-shrunk onto an electrode assembly in a cell according to yet another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] The implementation of the present invention will be described below through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the disclosure of this specification. The present invention can also be implemented or applied through other different specific implementation methods. The details of this specification can be modified or changed based on different perspectives and applications without departing from the spirit of the present invention. The following embodiments and features of each embodiment can be combined with each other if not inconsistent. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific implementations and are not intended to limit the scope of protection of the present invention. Test methods without specific conditions in the following embodiments usually follow conventional conditions or conditions provided by each manufacturer.

[0020] When a numerical range is given in an embodiment, it should be understood that any numerical value between the two endpoints of each numerical range can be selected unless otherwise specified in this disclosure. Unless otherwise defined, all technical and scientific terms used in this disclosure are consistent with the understanding of the prior art by those skilled in the art and the content of this disclosure. Any methods, devices, and materials in the prior art that are similar or equivalent to the methods, devices, and materials described in the embodiments of the present invention can also be used to implement the present invention.

[0021] It should be noted that terms such as "upper," "lower," "left," "right," "middle," and "one side" used in this specification are merely for the convenience of explanation and are not used to limit the applicable scope of the present invention. Any change or adjustment of the relative relationship shall be considered within the applicable scope of the present invention without substantially changing the technical content.

[0022] 1 to 15, the present invention provides a cell 100 and an electric device including the cell 100. The cell 100 employs a heat-shrinkable insulating film 140. In this manner, a relatively flat coating layer can be formed on the sidewall where the first tab 132 is located, solving the problem of wrinkles in the tab insulating tape of the existing cell 100 that tend to warp and cause insulation defects. A bonding area 141 is provided on the periphery of the heat-shrinkable insulating film 140. The heat-shrinkable insulating film 140 can be produced directly from a strip-shaped film body and is not affected by the demolding process of the cylindrical heat-shrinkable sleeve, so it can be thinner.

[0023] 1 to 3 , the cell 100 includes a housing 110, a first electrode terminal 120, an electrode assembly 130, and a heat-shrinkable insulating film 140. The housing 110 is used to form an internal space that houses the electrode assembly 130. Here, the internal space formed by the housing 110 may be used to house the electrode assembly 130, an electrolyte (not shown), and other components. The housing 110 may have various shapes and sizes, such as a cylinder, a rectangular parallelepiped, a hexagonal prism, etc. Specifically, the shape of the housing 110 may be determined based on the specific shape and size of the electrode assembly 130. The housing 110 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0024] 1 to 3 , in a cell 100 provided according to one embodiment of the present invention, a housing 110 includes an end wall 111 and a side wall 112 surrounding the end wall 111. The side wall 112 and the end wall 111 together surround a cylinder with one end closed and the other end open. The open end of the cylinder is sealed with an end cap 160. In one embodiment, a first electrode terminal 120 is electrically connected to a first tab 132 of an electrode assembly 130 via a current collector 150, and the housing 110 is electrically connected, directly or indirectly, to a second tab 133 of the electrode assembly 130. The side on which the first electrode terminal 120 is located includes both the first electrode terminal 120 and the end face of the housing. Thus, one end of a single cell 100 may include both a positive electrode and a negative electrode, facilitating series or parallel connection between multiple cells 100 to form a cell module or a battery pack. A mounting hole for the first electrode terminal is provided in the end wall 111 of the housing 110, and the first electrode terminal 120 is sealed and insulated and mounted in the mounting hole for the first electrode terminal. This structure of the housing 111 improves mounting efficiency and is superior in terms of assembly and sealing to a housing 110 that is open at both ends.

[0025] 1 to 3, the electrode assembly 130 is a component within the cell 100 where an electrochemical reaction occurs. One or more electrode assemblies 130 may be contained within the housing 110. The electrode assembly 130 is primarily formed by winding or stacking a positive electrode sheet and a negative electrode sheet, with a separator typically provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 130, while the portions of the positive and negative electrode sheets not containing active material constitute their respective tabs. The electrode assembly 130 is sealed and attached within the housing 110, and the specific form of sealing is not limited.

[0026] 1 to 3 and 6 , in one embodiment of the present invention, an electrode assembly 130 includes a bare cell 131, a first tab 132, and a second tab 133. The first tab 132 and the second tab 133 are located at two ends of the bare cell 131. The housing 110 has a negative electrical characteristic, and the first tab 132 has a positive electrical characteristic, and the first tab 132 of the electrode assembly 130 is electrically connected to the first electrode terminal 120. A heat-shrinkable insulating film 140 wraps around at least the periphery of the electrode assembly 130 near the first end so as to insulate and separate the first tab 132 from the side wall 112 of the housing 110. Here, the heat-shrinkable insulating film 140 is connected as a closed loop, and a bonding region 141 is provided on the periphery of the heat-shrinkable insulating film 140. The covering structure using the heat-shrinkable insulating film 140 may be formed by connecting both ends of a strip of heat-shrinkable insulating film so as to insulate and separate the first tab 132 from the side wall 112 of the housing 110, and then heating and heat-shrinking the film to wrap around the periphery of the first end of the electrode assembly 130. In this structure, a relatively smooth covering layer can be formed on the periphery where the first tab 132 is located. Furthermore, a heat-shrinkable insulating film having this type of structure can be produced directly from a strip of film and is not affected by the demolding process of a cylindrical heat-shrinkable sleeve, resulting in a thinner thickness.

[0027] 3 and 8, in one embodiment of the present invention, the heat-shrinkable insulating film 140 preferably further includes a side wall portion 143 and an end surface portion 142. The side wall portion 143 covers at least the peripheral surface of the electrode assembly 130 near the first end, and the end surface portion 142 at least partially covers the edge of the electrode assembly 130 near the first end. In this arrangement, insulation between the first tab 132 and the side wall 112 of the housing 110 can be improved, and the exposed end of the first tab 132 is prevented from coming into contact with the side wall 112. The heat-shrinkable insulating film 140 is wrapped around one end of the electrode assembly 130 and at least partially covers the first end surface 1321 where the first tab 132 is located, so that the first end surface 1321 of the first tab 132, which is electrically positive in the electrode assembly 130, is insulated and separated from the casing 110, which is electrically negative. The heat-shrinkable insulating film 140 is connected as a closed loop, and bonding regions 141 are provided on each of the side wall portion 143 and end surface portion 142 of the heat-shrinkable insulating film 140. In another embodiment of the present invention, unlike the above embodiment, the electrical properties of the casing 110 are positive and the electrical properties of the first tab 132 are negative. The heat-shrinkable insulating film 140 wraps around one end of the electrode assembly 130 and at least partially covers the first end surface 1321 where the first tab 132 is located, so that the end surface of the first tab 132, which is electrically negative in the electrode assembly 130, is insulated and separated from the end wall 111, which is electrically positive.

[0028] 1 to 3 and 6, in the cell 100 provided by the present invention, the bonding region 141 may be formed in various ways, such as a thermo-compression bonded region, an adhesive bonded region, or a region formed by combining an adhesive bond and a thermo-compression bonded region. The bonding region 141 may be formed before or during the process of attaching the heat-shrinkable insulating film 140 to the electrode assembly 130.

[0029] 4 to 8, in a cell 100 provided according to one embodiment of the present invention, the bonding region 141 includes only a thermocompression connection region. Referring to FIG. 4, specifically, the heat-shrinkable insulating film 140 has a band-like, open-loop appearance in its initial state before being wrapped around the electrode assembly 130. The band-like heat-shrinkable insulating film 140 is subjected to high-temperature thermocompression bonding to form the bonding region 141, thereby forming an annular heat-shrinkable insulating film 140 as a whole, as shown in FIG. 5. The annular heat-shrinkable insulating film 140 is attached to one end of the electrode assembly 130 corresponding to the first tab 132. The first tab 132 is a cut-tab positive electrode. That is, before the electrode sheet is wound, multiple tabs are cut out of the metal conductive sheet. After the electrode sheet is wound, the metal conductive sheet is folded toward the center of the electrode assembly 130 to form the tab end surface. The tab end surface formed by the tab cutting process is smooth, which facilitates subsequent electrical connection between the tab and the current collector plate. However, the edge of the cut tab is prone to loosening when the battery generates gas. When using conventional adhesive tape, the loose tab easily pushes open the wrinkles formed on the edge, creating a risk of short circuiting. In this embodiment, after heat shrinking, the side wall portion 143 of the annular heat-shrinkable insulating film 140 encases the edge of the first tab 132, and the edge portion 142 of the heat-shrinkable insulating film 140 covers the first edge 1321 where the first tab 132 is located, to insulate the periphery of the first tab 132 from the housing 110. The heat-shrinkable insulating film covering the first edge 1321 is formed by gathering the heat-shrinkable film material itself, i.e., the heat-shrinkable insulating film covering the first edge 1321 is in close contact with the first edge 1321. The heat-shrinkable insulating film effectively positions the multiple metal conductive sheets, which are cut tabs, making the tab less likely to loosen. The combined use of cut tab configuration and heat shrinkable insulating film produces favorable effects.

[0030] 1 to 3 and 6 , in a cell 100 according to another embodiment of the present invention, the bonding region 141 includes only an adhesive connection region. A strip-shaped heat-shrinkable insulating film 140 is bonded to the side edges of the cell 100 to form the bonding region 141, thereby forming a ring-shaped heat-shrinkable insulating film 140 as a whole. The ring-shaped heat-shrinkable insulating film 140 is attached to one end of the electrode assembly 130 corresponding to the first tab 132. After a subsequent heat-shrinking process, the ring-shaped heat-shrinkable insulating film 140 envelops the end of the electrode assembly 130 and at least partially covers the end surface where the first tab 132 is located. Of course, if necessary, the bonding region 141 may include both a thermocompression bonding region and an adhesive bonding region. However, those skilled in the art will understand that such an arrangement is costly. Of course, in other embodiments, the adhesive connection region may not be provided, and only thermocompression bonding may be used. In this process, the bonding region has only a seam of the thermocompression connection.

[0031] 1 to 3, the structure of the joint region 141 is not limited, and may be, for example, partially overlapping or not overlapping. In the cell 100 provided according to one embodiment of the present invention, the joint region 141 includes an overlapping region, and the overlapping width D of the overlapping region is 3 mm or less. The thickness of the heat-shrinkable insulating film 140 excluding the overlapping region is 0.03 mm to 0.06 mm, for example, 0.03 mm, 0.04 mm, 0.05 mm, and 0.06 mm. Within this overlapping width range and this thickness range of the heat-shrinkable insulating film 140, a desirable insulating effect is achieved, and excessive thickness and problematic overlapping regions are avoided. This allows the heat-shrinkable insulating film 140 to easily penetrate the housing, and can protect the cell from stress concentration at the portion where the heat-shrinkable insulating film contacts the housing when the cell expands during operation. However, in other embodiments, when a thermocompression connection is adopted, after high-temperature melting and thermocompression, the ends of the strip-shaped heat-shrinkable insulating film 140 are fused to each other to form a heat-fused seam, and the overlap is essentially close to zero and can be ignored.

[0032] 1 to 3 and 9 , in the present invention, the heat-shrinkable insulating film 140 may encase the electrode assembly 130 solely by the compressive force generated after heat shrinking. However, it is preferable that an adhesive layer 144 be provided on at least a portion of the contact surface between the peripheral sidewall of the heat-shrinkable insulating film 140 and the peripheral sidewall of the electrode assembly 130. The peripheral sidewall of the electrode assembly 130 may be a sidewall corresponding to the sidewall of the first tab 132 or the bare cell 131. The adhesive layer 144 may be aligned with the core of the electrode assembly 130 when the heat-shrinkable insulating film 140 is first attached, thereby preventing excessive shrinkage of the portion where the heat-shrinkable insulating film 140 and the sidewall of the electrode assembly 130 are bonded during subsequent heat shrinking and heating, which may result in overall insulation failure. The configuration of the adhesive layer 144 is not limited and may include, but is not limited to, an adhesive coating or a double-sided adhesive layer. The position of the adhesive layer 144 is also not limited. For example, the adhesive layer 144 may be disposed on the electrode assembly 130, and when the heat-shrinkable insulating film 140 is attached, the heat-shrinkable insulating film 140 may be pressed to adhere to the adhesive layer 144 on the electrode assembly 130. The adhesive layer 144 may be disposed on the inner wall of the heat-shrinkable insulating film 140, and when the heat-shrinkable insulating film 140 is attached, the adhesive layer 144 may be adhered to the side wall of the electrode assembly 130. Alternatively, the adhesive layer 144 may be disposed alternately on the inner wall of the heat-shrinkable insulating film 140 and the side wall of the electrode assembly 130. However, this arrangement is considered to be less economical and easier to manufacture than arrangement only on the inner wall of the heat-shrinkable insulating film 140 or only on the side wall of the electrode assembly 130.

[0033] In the present invention, the heat-shrinkable insulating film 140 only needs to be disposed on the side having the terminals. Referring to FIGS. 9 to 13, in a cell 100 provided according to one embodiment of the present invention, a first tab 132 and a second tab 133 are disposed on both ends of the electrode assembly 130. The first tab 132 and the second tab 133 need to be connected to corresponding terminals. A heat-shrinkable insulating film 140 needs to be provided for each of the first tab 132 and the second tab 133. In the initial band-shaped state, an adhesive layer 144 is provided on the heat-shrinkable insulating film 140, and the adhesive layer 144 is provided on the inner surface of the side wall portion 143 of the heat-shrinkable insulating film 140 and along the circumferential direction of the side wall portion 143. After attachment to the electrode assembly 130, the adhesive layer 144 is provided on at least a portion of the contact surface between the peripheral side wall of the heat-shrinkable insulating film 140 and the peripheral side wall of the electrode assembly 130. The adhesive layer 144 on the heat-shrinkable insulating film 140 corresponding to the first tab 132 is provided between the sidewall of the first tab 132 and / or the sidewall of the bare cell 131. The adhesive layer 144 on the heat-shrinkable insulating film 140 corresponding to the second tab 133 is provided between the sidewall of the second tab 133 and / or the sidewall of the bare cell 131. After the heat-shrinkable insulating film 140 is bonded and wrapped around the circumference, a bonding area is formed, thus forming the bonding area 141. The two heat-shrinkable insulating films 140 bonded to the first tab 132 and the second tab 133 have peripheral surfaces that protrude from the corresponding tabs. After shrinkage, the peripheral surfaces that protrude from the corresponding tabs cover the end surfaces of the corresponding tabs. In some other embodiments, a heat-shrinkable insulating film sleeve may first be formed by bonding, and then the heat-shrinkable insulating film sleeve may be placed on the electrode assembly 130 and then bonded to the sidewall of the bare cell 131.

[0034] Considering that the side walls of most existing bare cells 131 need to be covered with blue glue to bind the winding core, referring to FIGS. 13 to 15 , in a cell 100 provided according to one embodiment of the present invention, a side wall portion 143 wraps around the entire periphery of the electrode assembly 130. An adhesive layer 144 on a heat-shrinkable insulating film 140 covers the area of ​​the side wall portion 143 corresponding to the periphery of the electrode assembly 130 (including the side wall area of ​​the first tab 132, the side wall area of ​​the second tab 133, and the side wall area of ​​the bare cell 131). Furthermore, a first end face corresponding area 145 protruding from the first tab 132 is provided on the side of the adhesive layer 144 facing the first tab 132, and a second end face corresponding area 146 protruding from the second tab 133 is provided on the side of the adhesive layer 144 facing the second tab 133. After heat shrinking, the first end-corresponding region 145 covers the first end 1321 of the first tab 132, and the second end-corresponding region 146 covers the second end (not shown) of the second tab 133. In this way, an insulating coating layer can be formed on both tabs of the electrode assembly 130, and the insulating coating layer can also be integrally formed on the sidewall of the bare cell 131. This improves efficiency and allows for single-step bundling and edge insulation. Furthermore, when the heat-shrinkable insulating film 140 and the blue glue on the sidewall of the bare cell 131 are integrally formed, the heat-shrinkable insulating film 140 and the blue glue are prevented from overlapping and becoming excessively thick. When the cell 100 expands, the overlapping region is excessively thick, which can compress the housing, causing stress concentration and making it difficult for the cell 100 to fit into the housing. This also solves the problem of blue glue on the large surface of the bare cell 131 easily peeling off after immersion in electrolyte.

[0035] In the present invention, the heat-shrinkable insulating film 140 is made of a heat-shrinkable material, which is a polymer shape-memory material obtained by radiation processing of a polymer material. Common polymer materials such as polyethylene and polyvinyl chloride typically have a linear structure, which changes into a network structure under the action of a radiation source such as an electron accelerator. The network-structured polymer material obtained by this type of radiation processing is a heat-shrinkable material. Heat-shrinkable materials exhibit a unique shape-memory effect: after being expanded and cooled, the heat-shrinkable material can shrink to its original shape after being heated. During use, the heat-shrinkable material is heated to shrink, and the shrunk heat-shrinkable material forms a heat-shrinkable film that is flat and tightly wraps around the outer surface of an object, insulating, sealing, and protecting the wrapped object. In one embodiment of the present invention, the material of the heat-shrinkable film includes, but is not limited to, polyethylene terephthalate (PET) or polyethylene terephthalate-co-1,4-cyclohexylene dimethylene terephthalate (PETG). PET and PETG heat-shrinkable films can be manufactured from raw materials available from SK Chemicals. PET thermoplastic polyester is a type of crystalline polymer with a higher melting point, good mechanical properties, favorable elasticity, abrasion and impact resistance, low water absorption, excellent dimensional stability, favorable molding conditions, and favorable creep resistance under load. PETG is a transparent, amorphous copolyester with excellent toughness and high impact strength. PETG's impact strength is 3 to 10 times that of modified polyacrylates, and it offers a wide processing range, high mechanical strength, and excellent flexibility. PETG has higher transparency and better gloss than PVC, is easy to print on, and is environmentally friendly.

[0036] In the present invention, the electrical connection between the first tab 132 and the first electrode terminal 120 is not limited, and the two may be electrically connected directly or indirectly. Referring to FIG. 2 , in a cell 100 provided according to one embodiment of the present invention, the first tab 132 is electrically connected to the first electrode terminal 120 via a current collector 150. A heat-shrinkable insulating film 140 wraps around the peripheral edge surface of the current collector 150, and a through-hole 147 is formed at a position corresponding to the first electrode terminal 120. An electrical connector 151 on the current collector 150 is electrically connected to the first electrode terminal 120 through the through-hole 147. The electrical connection between the electrical connector 151 and the first electrode terminal 120 may be achieved by, but is not limited to, a welding method capable of achieving current transmission.

[0037] In a cell 100 provided according to one embodiment of the present invention, the ratio of the length of the heat-shrinkable insulating film 140 covering the end faces of the electrode assembly 130 to the length of the heat-shrinkable insulating film 140 covering the peripheral side walls of the electrode assembly 130 is 1 / 3 to 2 / 3. This ratio may be in any numerical range between 1 / 3 and 2 / 3, such as 1 / 3, 1 / 2, or 2 / 3. This proportional relationship makes it possible to maintain a relatively stable installation relationship, making it less likely that the heat-shrinkable insulating film 140 will fall off due to an excessively short length of the peripheral side walls of the electrode assembly 130 after heat shrinking and molding, and making it less likely that poor insulation will occur due to excessively insufficient coverage of the end faces of the electrode assembly 130.

[0038] In a second aspect of the present invention, an electric device is provided. The electric device includes an operating part and a cell based on the above. The operating part is electrically connected to the cell 100 to obtain power support. The electric device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc. The electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric plane toys. The electric tools may include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. The above electric devices are not particularly limited in the embodiments of the present invention.

[0039] In the cell 100 provided by the present invention, a bonding region 141 is provided on the periphery of the heat-shrinkable insulating film 140. This allows the strip-shaped heat-shrinkable insulating film 140 to be connected to the end of the electrode assembly 130 corresponding to the first tab 132. When heated, the heat-shrinkable insulating film 140 wraps around one end of the electrode assembly 130 and partially covers the end wall where the first tab 132 is located, insulating and isolating the electrode assembly 130 from the end wall of the cell 100's housing 110. This structural configuration allows a relatively smooth coating layer to be formed on the end surface where the first tab 132 is located. Furthermore, the heat-shrinkable insulating film 140 having this type of structure can be directly applied to a strip-shaped film and is not affected by the demolding process. This allows for a thinner thickness, solving the problems associated with thick heat-shrinkable films in the related art, reducing warping, and providing good insulation reliability and feasibility. The electrical device provided by the present invention uses the cell 100 provided by the present invention to supply power, thereby providing improved reliability. Therefore, it can effectively solve some practical problems in the related art and exhibit great utility value and practical significance. The above-described embodiments only illustrate the principles and effects of the present invention and are not intended to limit the present invention. Those skilled in the art may modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention are also intended to be included in the scope of the claims of the present invention. [Industrial Applicability]

[0040] The heat-shrinkable insulating film has a peripheral surface provided with a bonding region. This allows the strip-shaped heat-shrinkable insulating film to be connected at both ends, and then it is heated and heat-shrunk to wrap around the peripheral surface of the first end of the electrode assembly so as to insulate and separate the first tab from the side wall of the housing. This structural configuration allows a relatively smooth coating layer to be formed on the peripheral surface where the first tab is located. Furthermore, a heat-shrinkable insulating film having this type of structure can be directly manufactured from a strip-shaped film body and is not affected by the demolding process of a cylindrical heat-shrinkable sleeve. This allows for a thinner thickness, solving the problems associated with thick heat-shrinkable films in the related art, reducing warping, and providing good insulation reliability and feasibility. The electrical device provided by the present invention uses the cell provided by the present invention to supply power, thereby providing improved reliability. [Explanation of symbols]

[0041] 100: Cell 110: Cabinet 111: End wall 112: Side wall 120: 1st electrode terminal 130: Electrode assembly 131: Bearcell 132: First tab 1321: First end surface 133: Second tab 140: Heat-shrinkable insulating film 141:Joining area 142: End face part 143: Side wall 144: Adhesive layer 145: First end face corresponding area 146: Second end face corresponding area 147:Through hole 150: Current collector plate 151: Electrical connector 160: End cap

Claims

1. a housing including an end wall and a side wall surrounding the end wall; a first electrode terminal mounted through the end wall in an insulating manner; an electrode assembly sealed and mounted within the housing, the electrode assembly including a first tab at a first end electrically connected to the first electrode terminal; a heat-shrinkable insulating film that wraps at least a peripheral surface of the electrode assembly near the first end so as to insulate and separate the first tab from the side wall; the heat-shrinkable insulating film includes a side wall portion and an end wall portion; the side wall portion covers at least the peripheral surface of the electrode assembly near the first end, the end wall portion at least partially covers an end surface edge portion of the first end, an adhesive layer is provided on at least a portion of the contact surface between the side wall portion and the electrode assembly; the adhesive layer is provided on the inner surface of the side wall portion and is arranged along the circumferential direction of the side wall portion; The heat-shrinkable insulating film is connected as a closed loop, and a bonding area is provided on a periphery of the heat-shrinkable insulating film.

2. The cell of claim 1 , wherein the bonding regions include thermocompression bonded regions and / or adhesive bonded regions.

3. 2. The cell according to claim 1, wherein the bonding region includes an overlapping region, the overlapping width of the overlapping region is 3 mm or less, and the thickness of the heat-shrinkable insulating film other than the overlapping region is 0.03 mm to 0.06 mm.

4. 4. The cell according to claim 3, wherein the material of the heat-shrinkable insulating film is polyethylene terephthalate (PET) or polyethylene terephthalate-co-1,4-cyclohexylene dimethylene terephthalate (PETG).

5. the side wall portion encloses the entire circumferential surface of the electrode assembly, The cell of claim 1 , wherein the adhesive layer covers an area of ​​the sidewall portion corresponding to the entire peripheral sidewall of the electrode assembly.

6. 10. The cell of claim 1, wherein the first tab is a positive electrode tab, the positive electrode tab including a plurality of metal conductive sheets.

7. the first tab is electrically connected to the first electrode terminal via a current collector plate; the heat-shrinkable insulating film wraps around a peripheral end surface of the current collector plate and has a through hole formed at a position corresponding to the first electrode terminal; The cell according to claim 1 , wherein the electrical connector of the current collector plate is electrically connected to the first electrode terminal through the through hole.

8. 2. The cell according to claim 1, wherein a ratio of a length of the heat-shrinkable insulating film covering the end surfaces of the electrode assembly to a length of the heat-shrinkable insulating film covering the peripheral side walls of the electrode assembly is 1 / 3 to 2 / 3.

9. The operating part and and the cell according to any one of claims 1 to 8, The working part is electrically connected to the cell to obtain power support.

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