Tape, battery cell, electronic equipment and energy storage device

Abstract

This application provides an adhesive tape, a battery cell, an electronic device, and an energy storage device. The battery cell includes a housing, a bare battery cell, an electrolyte, and an adhesive tape. The bare battery cell and the electrolyte are housed inside the housing, with the bare battery cell immersed in the electrolyte. The adhesive tape covers the outer surface of the bare battery cell and includes an adhesive layer, a thermally conductive layer, and an expansion layer. The adhesive layer, thermally conductive layer, and expansion layer are sequentially arranged along the outer surface away from the bare battery cell. The expansion layer absorbs the electrolyte and expands. Both the thermally conductive layer and the expansion layer are made of polymer materials. The adhesive tape, battery cell, electronic device, and energy storage device provided in this application can improve the stability of the adhesive tape during battery cell operation, thereby enhancing the safety and durability of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to an adhesive tape, a battery cell, an electronic device, and an energy storage device. Background Technology

[0002] In battery structural design, the insulating tape of the battery cell plays a crucial role in ensuring battery safety and reliability. The tape is typically adhered to the outer surface of the bare battery cell, providing stable insulation protection while also possessing certain thermal conductivity to help dissipate heat evenly within the cell. However, traditional insulating tapes usually employ a simple multi-layered structure. During long-term use, factors such as internal temperature fluctuations, charge / discharge expansion, and mechanical vibration can cause the tape layers to peel or even detach. Utility Model Content

[0003] This application provides an adhesive tape, a battery cell, an electronic device, and an energy storage device that can improve the stability of the adhesive tape during battery cell operation, thereby enhancing the safety and durability of the battery.

[0004] In a first aspect, a battery cell is provided, comprising a housing, a bare battery cell, an electrolyte, and an adhesive tape. The bare battery cell and the electrolyte are housed inside the housing, and the bare battery cell is immersed in the electrolyte. The adhesive tape covers the outer surface of the bare battery cell and includes an adhesive layer, a thermally conductive layer, and an expansion layer. The adhesive layer, the thermally conductive layer, and the expansion layer are sequentially disposed along the outer surface away from the bare battery cell. The expansion layer absorbs the electrolyte and expands. Both the thermally conductive layer and the expansion layer are made of polymer materials.

[0005] In this embodiment, on the one hand, both the thermally conductive layer and the expansion layer in the tape are made of polymer materials, which can improve the fusion between the two layers, thereby making the two layers adhere more tightly and reducing the risk of peeling or detachment between the layers due to factors such as internal temperature fluctuations of the battery cell and expansion during charging and discharging. This improves the stability of the tape during use. Furthermore, the polymer material has excellent electrical insulation properties, allowing the tape to provide insulation protection between the bare battery cell and the casing, reducing the risk of corrosion caused by electrical conduction between the casing and the bare battery cell. On the other hand, the thermally conductive layer in the tape can conduct heat inside the bare battery cell, reducing heat accumulation inside the bare battery cell and thus improving fast charging performance. The expansion layer in the tape can absorb electrolyte and expand, thereby providing compression space for the expansion of the bare battery cell, improving the cycle life of the battery cell. In addition, the expansion layer can store the absorbed electrolyte, providing more storage space for the electrolyte. The expansion layer and the thermally conductive layer enable the tape to achieve multiple functions, making it suitable for various scenarios and improving the overall performance of the battery cell.

[0006] In conjunction with the first aspect, in some implementations of the first aspect, the expanded layer is filled with inorganic material.

[0007] In this embodiment, the inorganic material has a certain hardness and its structure is stable. Without affecting the expansion performance of the expansion layer, it can increase the structural strength of the expansion layer, so that the tape can provide a certain support for the bare battery cell.

[0008] In conjunction with the first aspect, in some implementations of the first aspect, the Mohs hardness of the inorganic material is greater than or equal to 4.

[0009] In this embodiment, the inorganic material has a Mohs hardness greater than or equal to 4, which can improve the strength of the expansion layer and thus enhance the overall support performance of the tape.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, the inorganic material includes silicon dioxide, aluminum oxide, cubic boron nitride, silicon carbide, silicon nitride, or tungsten carbide.

[0011] In the embodiments of this application, silicon dioxide, aluminum oxide, cubic boron nitride, silicon carbide, silicon nitride, or tungsten carbide are all materials with high hardness, which can improve the strength of the expansion layer and thus improve the overall support performance of the tape.

[0012] In conjunction with the first aspect, in some embodiments of the first aspect, the mass ratio of the inorganic material in the expansion layer to the polymeric material in the expansion layer is 2:100.

[0013] In this embodiment, the mass ratio of inorganic material to polymer material is set to 2:100, which enables the expansion layer to have a good expansion effect while also having a certain structural strength, thereby improving the overall performance of the tape.

[0014] In conjunction with the first aspect, in some implementations of the first aspect, the expansion rate α of the expansion layer ranges from 150% to 400%.

[0015] In this embodiment, on the one hand, the expansion rate α of the expansion layer is greater than or equal to 150%, which can provide a certain buffer space for the expansion of the bare cell, avoiding excessive local stress caused by hard compression or collision between the bare cell and the casing, thus preventing phenomena such as lithium plating and improving the service life of the cell. On the other hand, the expansion rate α of the expansion layer is less than or equal to 400%, which can prevent the tape from occupying too much space inside the cell, leaving more space for the bare cell to use, thereby improving the energy density of the cell.

[0016] In conjunction with the first aspect, in some implementations of the first aspect, the material of the expanded layer includes rubber, polystyrene, or polyester.

[0017] In the embodiments of this application, the rubber, polystyrene, or polyester are all materials that are resistant to high temperatures and electrolytes, which can improve the structural stability of the expansion layer.

[0018] In conjunction with the first aspect, in some implementations of the first aspect, the thickness T of the expansion layer p The value range can be: 30μm≤T P ≤60μm.

[0019] In this embodiment of the application, on the one hand, the thickness T of the expansion layer is set. P A thickness greater than or equal to 30 μm allows the expansion layer to absorb liquid and expand, thereby improving its buffering performance and reducing the risk of failure due to hard compression between the bare cell and the casing. On the other hand, setting the thickness T of the expansion layer... P With a thickness of 60μm or less, the expansion layer can prevent excessive expansion of the expansion layer from encroaching on the internal space of the cell. Furthermore, when the gap between the bare cell and the casing is constant, the expansion layer can provide a certain amount of compression space for the expansion of the bare cell, thus preventing the expansion layer from completely occupying the gap and being unable to expand.

[0020] In conjunction with the first aspect, in some implementations of the first aspect, the thermal conductivity of the heat-conducting layer is greater than 1 W / mk.

[0021] In this embodiment, the thermal conductivity of the heat-conducting layer is set to be greater than 1W / mk, which can improve the thermal conductivity of the heat-conducting layer, increase the heat conduction speed between the bare cell and the casing, and improve the heat dissipation efficiency inside the bare cell.

[0022] In conjunction with the first aspect, in some implementations of the first aspect, the material of the thermally conductive layer includes polyacetylene, polyaniline, or polythiophene.

[0023] In the embodiments of this application, polyacetylene, polyaniline, or polythiophene are all intrinsically thermally conductive polymer materials, which can further improve the thermal conductivity of the thermally conductive layer.

[0024] In conjunction with the first aspect, in some implementations of the first aspect, the thickness T of the thermally conductive layer D The value range is: 50μm≤T D ≤80μm.

[0025] In this embodiment of the application, on the one hand, the thickness T of the heat-conducting layer is set. D A thickness greater than or equal to 50 μm can increase the thickness of the thermally conductive layer, thereby improving its thermal conductivity, enhancing the fast-charging performance of the battery cell, and reducing the risk of cell failure due to internal heat accumulation. On the other hand, setting the thickness T of the thermally conductive layer... D A thickness of 80μm or less can prevent the thermal conductive layer from occupying too much space inside the battery cell, thereby improving the space utilization rate of the battery cell and increasing energy density.

[0026] In conjunction with the first aspect, in some embodiments of the first aspect, the adhesive layer is made of a polymer material.

[0027] In this embodiment, the adhesive layer, like the thermal conductive layer and the expansion layer, is made of polymer material, which can improve the adhesion between the three layers and further enhance the stability of the tape.

[0028] In conjunction with the first aspect, in some embodiments of the first aspect, the material of the adhesive layer includes acrylic, epoxy resin or polyurethane.

[0029] In this embodiment, acrylic, epoxy resin or polyurethane has high temperature resistance and electrolyte resistance, which can improve the structural stability of the adhesive layer and make the tape bonded to the bare battery cell more firmly.

[0030] In conjunction with the first aspect, in some implementations of the first aspect, the thickness T of the adhesive layer J The value range is: 4μm≤T J ≤15μm.

[0031] In this embodiment of the application, on the one hand, the thickness T of the adhesive layer is set. J A thickness greater than or equal to 4μm can improve the adhesion between the tape and the bare battery cell, reducing the risk of tape detachment and subsequent failure. On the other hand, setting the adhesive layer thickness T... J A thickness of 15μm or less can prevent the adhesive layer from occupying too much space inside the cell, thereby increasing the energy density of the cell.

[0032] In conjunction with the first aspect, in some implementations of the first aspect, the housing has a first wall, which is the bottom wall of the housing; the bare battery cell has a first surface, which is the surface of the bare battery cell facing and close to the first wall; the tape includes a first tape, which covers the first surface, and the bare battery cell abuts against the first wall through the first tape.

[0033] In this embodiment, the bare battery cell is abutted against the first wall by a first adhesive tape. The first adhesive tape isolates the first surface of the bare battery cell from the first wall. When the casing is made of metal, this reduces the risk of corrosion caused by direct contact between the bare battery cell and the casing. Furthermore, the first wall is the bottom wall of the casing, and the first surface is positioned opposite to it, meaning the first adhesive tape is located on the bottom surface of the bare battery cell. The first adhesive tape can replace other supporting components to provide support for the bare battery cell, thereby improving the internal space utilization of the cell and increasing its energy density. In particular, the expansion layer in the tape is filled with inorganic material, which enhances the tape's rigidity and provides better support for the bare battery cell.

[0034] In conjunction with the first aspect, in some implementations of the first aspect, the housing further has a second wall, which is disposed adjacent to the first wall, and a chamfer is provided between the second wall and the first wall, wherein the thickness of the first tape is greater than or equal to the radius of the chamfer.

[0035] In this embodiment, the first tape has a certain thickness, such that the thickness of the first tape is greater than the radius of the chamfer. The bare cell can directly abut against the first wall of the casing through the first tape, which can reduce the risk of powder shedding and lithium plating caused by the collision between the bare cell and the chamfer, improve the reliability of the cell, and also reduce the use of additional support components, optimize the internal space of the cell, and improve the energy density of the cell.

[0036] In conjunction with the first aspect, in some implementations of the first aspect, the thickness of the first tape is greater than or equal to 250 μm.

[0037] In this embodiment, the thickness of the first tape is greater than or equal to 250 μm, which can improve the support strength of the bare battery cell and reduce the interference between the bare battery cell and the chamfer.

[0038] In conjunction with the first aspect, in some implementations of the first aspect, the housing has an opening, the battery cell further includes a cover, the cover is disposed over the opening, the cover is provided with a terminal post, the bare battery cell is provided with a tab, the tab is located on the surface of the bare battery cell facing the cover at a position corresponding to the terminal post, the tab is connected to the terminal post; the cover is parallel to the direction of gravity, and the surface of the bare battery cell facing the cover forms an angle with the plane in which the cover is located.

[0039] In this embodiment, the cover is arranged parallel to the direction of gravity, i.e., the battery cell is placed on its side. The tabs of the bare battery cell are connected to the terminals on the cover, so that the end of the bare battery cell with the tabs is suspended by the terminals through the tabs. This causes the local stress on the area of ​​the first surface that abuts against the first wall of the casing to increase further. Thus, by setting the first tape on the first surface, the tape provides a buffer for the area of ​​the first surface that is under severe local stress, so that a soft compression is formed between the area and the casing, thereby reducing the local stress on the bare battery cell and further improving the life of the battery cell.

[0040] In conjunction with the first aspect, in some implementations of the first aspect, the housing further has a second wall, which is a side wall of the housing; the bare battery cell further has a second surface, which is the surface of the bare battery cell facing and close to the second wall; the tape further includes a second tape, which covers the second surface; when the battery cell is fully charged, the second tape is in contact with the second wall, and when the battery cell is not fully charged, there is a gap between the second tape and the second wall.

[0041] In this embodiment, on the one hand, when the battery cell is not fully charged, the second tape does not completely fill the gap between the second surface and the second wall, allowing for some expansion space and enabling the battery cell to "breathe" freely during charging and discharging. When the battery cell is fully charged, the expansion is most severe, resulting in the most internal heat generation. The contact between the second tape and the second wall allows the heat inside the bare battery cell to be directly conducted away through the second tape, preventing heat accumulation inside from affecting the fast-charging performance of the battery cell. Furthermore, the thermal conductivity of the expanded layer after absorbing the electrolyte is further improved, thereby further enhancing the heat transfer speed. On the other hand, because the expanded layer in the tape absorbs the electrolyte, the second tape covering the second surface can store a certain amount of electrolyte, providing additional electrolyte for the bare battery cell in that area. It also provides a soft compression space for the bare battery cell, preventing direct hard compression between the bare battery cell and the casing, which would affect the charging and discharging performance of the battery cell, thereby improving the cycle life of the battery cell.

[0042] In conjunction with the first aspect, in some implementations of the first aspect, the second wall includes a first sub-sidewall and a second sub-sidewall, wherein the first sub-sidewall is the sidewall with the smallest area of ​​the housing, and the second sub-sidewall is the sidewall with the largest area of ​​the housing; the second surface includes a first sub-surface and a second sub-surface, wherein the first sub-surface faces the first sub-sidewall, and the second sub-surface faces the second sub-sidewall; the second tape includes a first sub-tape and a second sub-tape, wherein the first sub-tape and the second sub-tape respectively cover the first sub-surface and the second sub-surface; when the battery cell is not fully charged, there is a first gap between the first sub-tape and the first sub-sidewall, and there is a second gap between the second sub-tape and the second sub-sidewall, wherein the second gap is greater than the first gap.

[0043] In this embodiment, the area of ​​the second sub-sidewall is larger than that of the first sub-sidewall. During the charging and discharging process of the battery cell, the expansion of the second sub-sidewall is greater. Therefore, reserving more space between the second sub-sidewall and the second sub-surface can provide a buffer for the expansion of the bare battery cell.

[0044] In conjunction with the first aspect, in some embodiments of the first aspect, when the battery cell is fully charged, the first sub-tape is in contact with the first sub-sidewall, and the second sub-tape is in contact with the second sub-sidewall.

[0045] In this embodiment, on the one hand, when the battery cell is fully charged, the cell expands most significantly, generating the most internal heat. The first sub-tape contacts the first sub-sidewall, and the second sub-tape contacts the second sub-sidewall. This allows the heat inside the bare battery cell to be directly conducted away through the first and second sub-tapes, preventing heat buildup that could affect the cell's fast-charging performance. Furthermore, the thermal conductivity of the expanded layer increases further after absorbing electrolyte, thus further enhancing heat transfer speed. On the other hand, both the first and second sub-tapes can absorb and store a certain amount of electrolyte, providing additional electrolyte for the bare battery cell in that area. The expansion of the first and second sub-tapes through liquid absorption also provides a soft compression space for the bare battery cell, preventing direct hard compression between the bare battery cell and the casing, which could affect the cell's charge and discharge performance, thereby improving the cell's cycle life.

[0046] In conjunction with the first aspect, in some implementations of the first aspect, the housing further has a third wall disposed opposite to the first wall; the bare battery cell further has a third surface, the third surface being the surface of the bare battery cell facing and close to the third wall; the tape further includes a third tape, the third tape covering the third surface; the second tape is at least partially immersed in the electrolyte and transfers the electrolyte to the third tape.

[0047] In this embodiment, on one hand, because the expansion layer in the adhesive tape absorbs the electrolyte, the third adhesive tape covering the third surface can store a certain amount of electrolyte, providing additional electrolyte to the top of the bare battery cell. On the other hand, the second adhesive tape can transfer the electrolyte to the third adhesive tape, thereby continuously providing electrolyte to the third adhesive tape. Even as the electrolyte is continuously consumed, it can still provide electrolyte to the top of the bare battery cell, ensuring that electrolyte is present at all locations of the bare battery cell, thus improving the battery cell's lifespan. Specifically, the electrolyte can be transferred to the bare battery cell near the top through the expansion layer in the adhesive, thereby improving the battery cell's lifespan performance.

[0048] In conjunction with the first aspect, in some implementations of the first aspect, the thickness of the tape is greater than or equal to 100 μm.

[0049] In this embodiment, the tape thickness is greater than or equal to 100μm, which can improve the insulation performance between the bare battery cell and the casing, and also take into account the thermal conductivity and expansion buffering capacity of the tape, thereby improving the overall performance of the tape.

[0050] Secondly, a tape is provided, comprising an adhesive layer, a thermally conductive layer, and an expansion layer, wherein the thermally conductive layer and the expansion layer are both polymer materials.

[0051] In conjunction with the second aspect, in some implementations of the second aspect, the expanded layer is filled with inorganic material.

[0052] In this embodiment, the inorganic material has a certain hardness and its structure is stable. Without affecting the expansion performance of the expansion layer, it can increase the structural strength of the expansion layer, so that the tape can provide a certain support for the bare battery cell.

[0053] In conjunction with the second aspect, in some implementations of the second aspect, the Mohs hardness of the inorganic material is greater than or equal to 4.

[0054] In this embodiment, the inorganic material has a Mohs hardness greater than or equal to 4, which can improve the strength of the expansion layer and thus enhance the overall support performance of the tape.

[0055] In conjunction with the second aspect, in some implementations of the second aspect, the inorganic material includes silicon dioxide, aluminum oxide, cubic boron nitride, silicon carbide, silicon nitride, or tungsten carbide.

[0056] In the embodiments of this application, silicon dioxide, aluminum oxide, cubic boron nitride, silicon carbide, silicon nitride, or tungsten carbide are all materials with high hardness, which can improve the strength of the expansion layer and thus improve the overall support performance of the tape.

[0057] In conjunction with the second aspect, in some embodiments of the second aspect, the mass ratio of the inorganic material in the expansion layer to the polymeric material in the expansion layer is 2:100.

[0058] In this embodiment, the mass ratio of inorganic material to polymer material is set to 2:100, which enables the expansion layer to have a good expansion effect while also having a certain structural strength, thereby improving the overall performance of the tape.

[0059] In conjunction with the second aspect, in some implementations of the second aspect, the expansion rate α of the expansion layer ranges from 150% to 400%.

[0060] In this embodiment, on the one hand, the expansion rate α of the expansion layer is greater than or equal to 150%, which can provide a certain buffer space for the expansion of the bare cell, avoiding excessive local stress caused by hard compression or collision between the bare cell and the casing, thus preventing phenomena such as lithium plating and improving the service life of the cell. On the other hand, the expansion rate α of the expansion layer is less than or equal to 400%, which can prevent the tape from occupying too much space inside the cell, leaving more space for the bare cell to use, thereby improving the energy density of the cell.

[0061] In conjunction with the second aspect, in some implementations of the second aspect, the material of the expanded layer includes rubber, polystyrene, or polyester.

[0062] In the embodiments of this application, the rubber, polystyrene, or polyester are all materials that are resistant to high temperatures and electrolytes, which can improve the structural stability of the expansion layer.

[0063] In conjunction with the second aspect, in some implementations of the second aspect, the thickness T of the expansion layer P The value range can be: 30μm≤T P ≤60μm.

[0064] In this embodiment of the application, on the one hand, the thickness T of the expansion layer is set. P A thickness greater than or equal to 30 μm allows the expansion layer to absorb liquid and expand, thereby improving its buffering performance and reducing the risk of failure due to hard compression between the bare cell and the casing. On the other hand, setting the thickness T of the expansion layer... P With a thickness of 60μm or less, the expansion layer can prevent excessive expansion of the expansion layer from encroaching on the internal space of the cell. Furthermore, when the gap between the bare cell and the casing is constant, the expansion layer can provide a certain amount of compression space for the expansion of the bare cell, thus preventing the expansion layer from completely occupying the gap and being unable to expand.

[0065] In conjunction with the second aspect, in some implementations of the second aspect, the thermal conductivity of the thermally conductive layer is greater than 1 W / mk.

[0066] In this embodiment, the thermal conductivity of the heat-conducting layer is greater than 1W / mk, which can improve the thermal conductivity of the heat-conducting layer, increase the heat conduction speed between the bare cell 12 and the shell 11, and improve the heat dissipation efficiency inside the bare cell 12.

[0067] In conjunction with the second aspect, in some implementations of the second aspect, the material of the thermally conductive layer includes polyacetylene, polyaniline, or polythiophene.

[0068] In the embodiments of this application, polyacetylene, polyaniline, or polythiophene are all intrinsically thermally conductive polymer materials, which can further improve the thermal conductivity of the thermally conductive layer.

[0069] In conjunction with the second aspect, in some implementations of the second aspect, the thickness T of the thermally conductive layer D The value range is: 50μm≤T D ≤80μm.

[0070] In this embodiment of the application, on the one hand, the thickness T of the heat-conducting layer is set. DA thickness greater than or equal to 50 μm can increase the thickness of the thermally conductive layer, thereby improving its thermal conductivity, enhancing the fast-charging performance of the battery cell, and reducing the risk of cell failure due to internal heat accumulation. On the other hand, setting the thickness T of the thermally conductive layer... D A thickness of 80μm or less can prevent the thermal conductive layer from occupying too much space inside the battery cell, thereby improving the space utilization rate of the battery cell and increasing energy density.

[0071] In conjunction with the second aspect, in some embodiments of the second aspect, the adhesive layer is made of a polymer material.

[0072] In this embodiment, the adhesive layer, like the thermal conductive layer and the expansion layer, is made of polymer material, which can improve the adhesion between the three layers and further enhance the stability of the tape.

[0073] In conjunction with the second aspect, in some embodiments of the second aspect, the material of the adhesive layer includes acrylic, epoxy resin or polyurethane.

[0074] In this embodiment, acrylic, epoxy resin or polyurethane has high temperature resistance and electrolyte resistance, which can improve the structural stability of the adhesive layer and make the tape bonded to the bare battery cell more firmly.

[0075] In conjunction with the second aspect, in some implementations of the second aspect, the thickness T of the adhesive layer J The value range is: 4μm≤T J ≤15μm.

[0076] In this embodiment of the application, on the one hand, the thickness T of the adhesive layer is set. J A thickness greater than or equal to 4μm can improve the adhesion between the tape and the bare battery cell, reducing the risk of tape detachment and subsequent failure. On the other hand, setting the adhesive layer thickness T... J A thickness of 15μm or less can prevent the adhesive layer from occupying too much space inside the cell, thereby increasing the energy density of the cell.

[0077] In conjunction with the second aspect, in some implementations of the second aspect, the thickness of the tape is greater than or equal to 100 μm.

[0078] Thirdly, a battery pack is provided, comprising: one or more battery cells as described in the first aspect and any implementation thereof, wherein the one or more battery cells are connected in series or in parallel; a battery pack housing, wherein the one or more battery cells are housed within the battery pack housing; and a battery management system connected to the battery cells, wherein the battery management system is used to control the charging and discharging of the battery cells or to monitor the state of the battery cells.

[0079] Fourthly, an electronic device is provided, comprising one or more battery cells as described in the first aspect and any implementation thereof, or comprising tape as described in the second aspect and any implementation thereof, or comprising a battery pack as described in the third aspect and any implementation thereof.

[0080] Fifthly, an energy storage device is provided, comprising one or more battery cells as described in the first aspect and any implementation thereof, or comprising tape as described in the second aspect and any implementation thereof, or comprising a battery pack as described in the third aspect and any implementation thereof. Attached Figure Description

[0081] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0082] Figure 2 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application.

[0083] Figure 3 This is a schematic diagram of the structure of an adhesive tape provided in an embodiment of this application.

[0084] Figure 4 This is a top view of a battery cell provided in an embodiment of this application.

[0085] Figure 5 This is a cross-sectional view of a battery cell provided in an embodiment of this application.

[0086] Figure 6 This is a partial structural diagram of another battery cell provided in an embodiment of this application.

[0087] Figure 7 This is a partial structural schematic diagram of another type of battery cell provided in the embodiments of this application.

[0088] Figure 8 This is a cross-sectional view of another battery cell provided in an embodiment of this application.

[0089] Figure 9 This is a schematic diagram of the structure of another electronic device provided in an embodiment of this application.

[0090] Figure 10 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of this application.

[0091] The labels for each figure are as follows:

[0092] 10-Battery cell; 11-Housing; 111-First wall; 112-Second wall; 113-Third wall; 12-Bare cell; 121-First surface; 122-Second surface; 123-Third surface; 13-Tape; 131-Adhesive layer; 132-Thermal conductive layer; 133-Expansion layer; 1301-First tape; 1302-Second tape; 1303-Third tape; 14-Cover; 141-Terminal post; 20-Battery management system; 100-Electronic equipment; 110-Battery pack; 120-Powertrain; 130-Drive motor; 140-Load; 200-Energy storage device; 210-Power converter. Detailed Implementation

[0093] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0094] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0095] The terms "first," "second," "third," "fourth," etc. (if present) in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0096] Unless otherwise defined, the technical terms or scientific data used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and for simplification, and do not indicate or specify that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0097] It should be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example in the figure. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0098] This application provides an adhesive tape, a battery cell, an electronic device, and an energy storage device, which can improve the stability of the adhesive tape during battery cell operation, thereby enhancing the safety and durability of the battery.

[0099] The solutions provided in this application can be applied to electronic devices. Electronic devices can be, for example, terminal consumer products or 3C electronic products (computer, communication, and consumer electronic products), such as mobile phones, power banks, laptops, tablets, e-readers, laptops, digital cameras, wearable devices, in-vehicle terminals, headphones, etc.; or they can be vehicles, electric skateboards, electric bicycles, etc.

[0100] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0101] Figure 1 This is a schematic structural diagram of an electronic device 100 provided in an embodiment of this application. Figure 1 The illustrated embodiment uses a vehicle as an example to illustrate the concept of electronic device 100.

[0102] Electronic device 100 may include four wheels, a battery pack 110, a powertrain 120, and a drive motor 130. During charging of the electric vehicle, the powertrain 120 receives alternating current (AC) and converts it to direct current (DC) to charge the battery pack 110. During operation of the electric vehicle, the powertrain 120 receives DC power from the battery pack 110 and supplies power to the drive motor 130 to drive the four wheels.

[0103] The vehicle in this application embodiment can be any of the different types of vehicles such as cars, trucks, and passenger buses, or other types of vehicles powered by batteries.

[0104] The battery pack 110 may include one or more battery cells 10. These cells 10 can be connected in series or in parallel, for example, by connecting the terminals of the cells 10 via a busbar, thus enabling series or parallel connection. The battery pack 110 may also include components such as a battery management system 20. The battery management system 20 is connected to the battery cells 10 and is used to control and monitor the parameters of the battery cells 10, maintaining their performance and safety.

[0105] The battery cell 10 can be, for example, a lithium-ion secondary battery, a sodium-ion secondary battery, a potassium-ion secondary battery, a magnesium-ion secondary battery, a zinc-ion secondary battery, an aluminum-ion secondary battery, etc.

[0106] Figure 2 This is a schematic diagram of the structure of a battery cell 10 provided in an embodiment of this application. The battery cell 10 includes: a housing 11, a bare battery cell 12, an electrolyte, and an adhesive tape 13. The housing 11 is used to prevent the electrolyte from leaking to the outside of the battery cell 10. At the same time, the housing 11 is also used to fix the position of the bare battery cell 12. A receiving cavity is formed inside the housing 11. The bare battery cell 12 is placed in the receiving cavity and immersed in the electrolyte. The adhesive tape 13 covers the outer surface of the bare battery cell 12 to insulate the bare battery cell 12 from the housing 11.

[0107] In the embodiments of this application, such as Figure 3 As shown, the tape 13 may include an adhesive layer 131, a thermally conductive layer 132, and an expansion layer 133. The adhesive layer 131, thermally conductive layer 132, and expansion layer 133 are sequentially stacked and adhered to the outer surface of the bare battery cell 12, wherein the adhesive layer 131 is close to the outer surface of the bare battery cell 12. The adhesive layer 131 is used to firmly adhere the tape to the outer surface of the bare battery cell 12, the thermally conductive layer 132 is used to conduct heat from inside the bare battery cell 12 to the outside, and the expansion layer 133 is used to absorb electrolyte and expand. Both the thermally conductive layer 132 and the expansion layer 133 are made of polymer materials.

[0108] The battery cell 10 provided in this application embodiment, on the one hand, can store the electrolyte by absorbing it through the expansion layer 133, thereby providing more storage space for the electrolyte. At the same time, both the thermally conductive layer 132 and the expansion layer 133 are made of polymer materials, and the fusion between the two layers is higher, so that the two layers are more tightly bonded, reducing the risk of the layers peeling off or falling off due to factors such as internal temperature fluctuations and charge-discharge expansion of the battery cell 10, improving the stability of the tape 13 during use. In addition, the polymer material has good electrical insulation properties, so that the tape 13 can provide insulation protection between the bare battery cell 12 and the shell 11, reducing the risk of corrosion caused by electrical conduction between the shell 11 and the bare battery cell 12. On the other hand, the thermally conductive layer 132 in the tape 13 can conduct heat inside the bare cell 12, reducing heat accumulation inside the bare cell 12 and thus improving fast charging performance. The expansion layer 133 in the tape 13 can absorb electrolyte expansion, thereby providing compression space for the expansion of the bare cell 12, improving the cycle life of the battery 10. In addition, the expansion layer 133 can store the absorbed electrolyte, providing more storage space for the electrolyte. The expansion layer 133 and the thermally conductive layer 132 enable the tape 13 to achieve multiple functions, thus making it suitable for various scenarios and improving the overall performance of the battery cell 10.

[0109] It should be understood that the material of the casing 11 can be steel, aluminum, other metallic materials, or non-metallic materials. The shape of the casing 11 can be adapted to the shape of the battery cell 10. For example, the shape of the battery cell 10 can be square, cylindrical, blade-shaped, or polygonal, etc., and correspondingly, the shape of the casing 11 can also be square, cylindrical, blade-shaped, or polygonal, etc.

[0110] In some embodiments, continue to refer to Figure 2 The battery cell 10 may also include a cover 14, and the housing 11 has an opening, with the cover 14 covering the opening of the housing 11. The cover 14 has a terminal post 141, and the bare battery cell 12 has a tab. The tab is connected to the terminal post 141, or the tab is connected to the terminal post 141 through other connectors. This embodiment of the application does not specifically limit the connection in this way.

[0111] The housing 11 may have one or more openings, and correspondingly, the cover 14 may also have one or more openings. For example, if the housing 11 has one opening, then one cover 14 may be provided and cover the opening of the housing 11. As another example, if the housing 11 has two openings that are arranged opposite to each other, then two covers 14 may be provided and cover the two openings of the housing 11 respectively.

[0112] The tape 13 can completely cover the outer surface of the bare battery cell 12, or it can partially cover the outer surface of the bare battery cell 12. For example, the tape 13 can only cover the bottom and / or sides of the bare battery cell 12. Another example is that the tape 13 can cover all surfaces of the bare battery cell 12 except for the surface where the tabs are located. Yet another example is that the tape 13 can cover the entire outer surface of the bare battery cell 12 except for the tabs.

[0113] In some embodiments, the bare cell 12 may include one or more cores, the outer surface of each core is covered with tape 13, or the cores are arranged along the thickness direction and the outer surface of the cores arranged as a whole is covered with tape 13.

[0114] The core can be wound together from a positive electrode sheet, a negative electrode sheet, and a separator. The separator can be placed between the positive and negative electrode sheets, and there can be multiple positive electrode sheets, as well as multiple negative electrode sheets and separators.

[0115] In some embodiments, the bare cell 12 may include one or more stacked cells, the outer surface of each of the stacked cells being covered with tape 13, or the stacked cells being arranged along the thickness direction and the outer surface of the stacked cells arranged as a whole being covered with tape 13.

[0116] The stacked core can be composed of positive electrode plates, negative electrode plates and separators. The separator can be placed between the positive electrode plates and the negative electrode plates. The number of positive electrode plates, negative electrode plates and separators can be multiple. The positive electrode plates, separators and negative electrode plates are stacked sequentially along the thickness direction.

[0117] The positive electrode can be composed of a positive current collector and a positive active film. The positive active film can be coated on the surface of the positive current collector and is located on two main planes of the positive current collector. Both planes can be coated with the positive active film. The material of the positive current collector can be a metal foil, such as aluminum. The material of the positive active film can include electrode materials, binders, and conductive agents. The electrode materials can be lithium cobalt oxide, lithium iron phosphate, layered nickel cobalt manganese oxide, etc. The conductive agent can promote the electron transfer rate inside the electrode and reduce electrode polarization. The binder can maintain the adhesion between the active film components and between the active film and the current collector.

[0118] Similarly, the negative electrode sheet can be composed of a negative current collector and a negative active film. The negative active film can be coated on the surface of the negative current collector and located on two main planes of the negative current collector. The material of the negative current collector can also be a metal foil, such as copper. The material of the negative active film can also include electrode materials, binders, and conductive agents. The electrode material of the negative electrode sheet can be graphite.

[0119] The negative electrode active films located on the two main planes of the negative electrode sheet can be referred to as the first active film and the second active film, respectively. The composition of the first active film and the second active film can be the same, and they are formed on the two main planes of the negative electrode current collector through steps such as coating, drying and rolling.

[0120] The electrode sheet may also have tabs. The positive electrode sheet has a positive tab, which is connected to the positive terminal on the cover 14. The negative electrode sheet has a negative tab, which is connected to the negative terminal on the cover 14. This allows current to flow between the internal and external circuits of the battery cell 10, so as to realize the charging and discharging of the battery cell 10.

[0121] In some embodiments, the thermally conductive layer 132 and the expansion layer 133 in the tape 13 can be made of the same polymer material, or they can be made of different polymer materials. For example, the thermally conductive layer 132 can be made of a polymer material with a high thermal conductivity, thereby improving the thermal conductivity of the thermally conductive layer 132, increasing the speed at which heat is conducted outward during the charging and discharging process of the battery cell 10, and improving the fast charging performance of the battery cell 10. As another example, the expansion layer 13 can be made of a polymer material with a high coefficient of expansion, so that the tape 13, which is immersed in the electrolyte along with the bare battery cell 12, can absorb the electrolyte and expand. When the bare battery cell 12 expands, the tape 13 is preferentially squeezed, thereby providing a buffer space for the bare battery cell 12, thus avoiding the bare battery cell 12 from being directly squeezed and collided with the casing 11, which would cause excessive local stress and lead to phenomena such as lithium plating, and improve the service life of the battery cell 10.

[0122] In some embodiments, the thermal conductivity of the thermal conductive layer 132 can be greater than 1 W / mk, thereby enabling the thermal conductive layer to have good thermal conductivity, improving the heat conduction speed between the bare cell 12 and the housing 11, and improving the heat dissipation efficiency inside the bare cell 12.

[0123] The thermally conductive layer 132 can be made of an intrinsically thermally conductive polymer material. The intrinsic polymer can refer to a polymer that has been synthesized and processed to achieve high crystallinity and orientation, thereby reducing phonon scattering and improving thermal conductivity. For example, the thermally conductive layer 132 can be a polymer with a highly thermally conductive conjugated structure, thus enabling the tape 13 to have a high thermal conductivity.

[0124] Specifically, the material of the thermally conductive layer 132 can be silicone, polyacetylene, polyaniline, and polythiophene, etc.

[0125] In some embodiments, the thickness T of the thermally conductive layer 132 D The value range can be: 50μm≤T D ≤80μm. On the one hand, set T DA thickness greater than or equal to 50 μm can increase the thickness of the heat-conducting layer 132, thereby improving the thermal conductivity of the heat-conducting layer 132, improving the fast-charging performance of the battery cell 10, and reducing the risk of battery cell 10 failure due to internal heat accumulation. On the other hand, setting T... D A thickness of 80μm or less can prevent the thermal conductive layer 132 from occupying too much space inside the cell 10, thereby improving the space utilization of the cell 10 and increasing the energy density.

[0126] Specifically, the thickness T of the thermally conductive layer 132 D It can be any of the following values ​​or between any of the following values: 50μm, 51μm, 52μm, 53μm, 54μm, 55μm, 56μm, 57μm, 58μm, 59μm, 60μm, 62μm, 65μm, 67μm, 68μm, 70μm, 73μm, 75μm, 76μm, 77μm, 78μm, 79μm, 80μm.

[0127] In some embodiments, the expansion rate α of the expansion layer 133 can be in the range of 150% ≤ α ≤ 400%. On the one hand, an expansion rate α of the expansion layer 133 greater than or equal to 150% can provide a certain buffer space for the expansion of the bare cell 12, avoiding excessive local stress caused by hard compression or collision between the bare cell 12 and the casing 11, which could lead to phenomena such as lithium plating, and thus improve the service life of the cell 10. On the other hand, an expansion rate α of the expansion layer 133 less than or equal to 400% can prevent the tape 13 from occupying too much space inside the cell 10, leaving more space for the bare cell 12 to use, thereby improving the energy density of the cell 10.

[0128] In the embodiments of this application, the expansion rate α can be any of the following values ​​or between any of the following values: 150%, 160%, 200%, 220%, 250%, 280%, 300%, 330%, 350%, 370%, 390%, 400%.

[0129] The expansion layer 133 can be made of a high-temperature resistant liquid-absorbing and swelling polymer material, for example, the expansion layer 133 can be made of a polymer material that can withstand temperatures above 150°C. In the embodiments of this application, the material of the expansion layer 133 can be rubber, polystyrene, or polyester, etc. In this way, the expansion layer 133 can be more resistant to high temperatures and electrolytes, and the structural stability of the expansion layer 133 can be improved.

[0130] In some embodiments, the expansion layer 133 may also be filled with a portion of inorganic material. Inorganic materials have a certain degree of hardness and stable structure, and without affecting the expansion performance of the expansion layer 133, they can increase the structural strength of the expansion layer 133, allowing the tape 13 to provide some support for the bare cell 12. For example, the tape 13 located at the bottom of the bare cell 12 can have sufficient strength to support the bare cell 12, allowing the bare cell 12 to abut against the inner bottom wall of the housing 11 via the tape 13, without the need for additional support members such as a bottom support plate. This provides more usable space for the bare cell 12, thereby increasing the energy density of the cell 10.

[0131] The inorganic material filled in the expansion layer 133 can be a material with a Mohs hardness greater than or equal to 4. For example, the inorganic material can be silicon dioxide, alumina, cubic boron nitride, silicon carbide, silicon nitride, or tungsten carbide. Silicon dioxide, alumina, cubic boron nitride, silicon carbide, silicon nitride, or tungsten carbide are all materials with high hardness, which can improve the strength of the expansion layer 133, thereby improving the overall support performance of the tape 13.

[0132] It should be understood that the proportion of inorganic materials in the expansion layer 133 can be set according to actual performance requirements. In some embodiments, the mass ratio of inorganic materials to polymer materials in the expansion layer 133 can be 2:100, and can fluctuate by about 1%. In this way, the expansion layer 133 has a good expansion effect while also having a certain structural strength, thereby improving the overall performance of the tape 13.

[0133] In some embodiments, the thickness T of the expansion layer 133 P The value range can be: 30μm≤T P ≤60μm. On the one hand, set T P With a thickness greater than or equal to 30 μm, the expansion layer 133 can absorb liquid and expand, thereby improving its buffering performance and reducing the risk of failure due to hard compression between the bare cell 12 and the casing 11. On the other hand, setting T... P With a thickness of less than or equal to 60μm, the expansion layer 133 can prevent excessive expansion of the expansion layer 133 from encroaching on the space inside the cell 10. Furthermore, when the gap between the bare cell 12 and the casing 11 is constant, the expansion layer 133 can provide a certain amount of compression space for the expansion of the bare cell 12, thus preventing the expansion layer 133 from completely occupying the gap and being unable to expand.

[0134] In this embodiment of the application, the thickness T of the expansion layer 133 is... PIt can be any of the following values ​​or between any of the following values: 30μm, 35μm, 36μm, 37μm, 38μm, 39μm, 40μm, 41μm, 42μm, 43μm, 44μm, 45μm, 46μm, 47μm, 48μm, 49μm, 50μm, 51μm, 52μm, 53μm, 54μm, 55μm, 56μm, 57μm, 58μm, 59μm, 60μm.

[0135] In some embodiments, the adhesive layer 131 may also be made of a polymer material, thereby improving the adhesion between the three layers of adhesive layer 131, thermal conductive layer 132 and expansion layer 133, and further enhancing the stability of tape 13.

[0136] In this embodiment, the adhesive layer 131 can be made of acrylic acid, epoxy resin, or polyurethane, etc. Acrylic acid, epoxy resin, or polyurethane have high temperature resistance and electrolyte resistance, which can improve the structural stability of the adhesive layer and make the tape bond more firmly to the bare battery cell.

[0137] The processing methods for each layer of tape 13 can include hot pressing, coating, casting, etc. For example, the expansion layer 133 can be hot-pressed into shape on a flatbed hot press using a mold of a certain size, and then a layer of thermally conductive polymer can be hot-pressed onto the surface of the expansion layer 133 to obtain the expansion layer 133 and the thermally conductive layer 132. Then, the adhesive can be cast and coated onto the surface near the thermally conductive layer 132 to obtain tape 13.

[0138] By hot pressing, the expansion layer 133 and the thermally conductive layer 132 are combined together, making the expansion layer 133 and the thermally conductive layer 132, both of which are polymer materials, more stable when heated. This reduces the risk of the expansion layer 133 and the thermally conductive layer 132 separating from each other, causing the tape 13 to fail, and further improves the structural stability of the tape 13.

[0139] It should be understood that the thickness of each layer in the tape 13 can be adjusted according to actual performance requirements. For example, the thickness of the thermally conductive layer 132 can be appropriately increased to improve the heat dissipation performance of the battery cell 10. Alternatively, the thickness of the expansion layer 133 can be appropriately increased to reduce local stress in the bare battery cell 12 and extend its service life. Furthermore, the thickness of the adhesive layer 131 can be appropriately increased to improve the adhesion of the tape to the bare battery cell 12, reduce the risk of failure due to weak adhesion of the tape 13, and improve the reliability of the battery cell 10.

[0140] The thickness T of adhesive layer 131 J The thickness can be adjusted according to the thickness of the thermally conductive layer 132 and the expansion layer 133. For example, the thickness T of the thermally conductive layer 132 can be adjusted accordingly. D and / or the thickness T of the expansion layer 133P When the setting is relatively large, the thickness T of the adhesive layer 131 J The size can be increased accordingly, so that the tape 13 will adhere more firmly to the bare battery cell 12.

[0141] In some embodiments, the thickness T of the adhesive layer 131 J The value range is: 4μm≤T J ≤15μm. On the one hand, set T J A thickness greater than or equal to 4μm can improve the adhesion between the tape 13 and the bare battery cell 12, reducing the risk of tape 13 detaching and causing failure. On the other hand, setting T... J A thickness of less than or equal to 15μm can prevent the adhesive layer 131 from occupying too much space inside the cell 10 and improve the energy density of the cell 10.

[0142] In this embodiment of the application, the thickness T of the adhesive layer 131 is... J It can be any of the following values ​​or between any of the following values: 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm.

[0143] It should be understood that one or more layers of adhesive tape 13 can be adhered to the outer surface of the bare battery cell 12. Each layer of adhesive tape 13 includes an adhesive layer 131, a thermally conductive layer 132, and an expansion layer 133. The thickness of the adhesive tape 13 can be designed and adjusted according to the actual size of the battery cell 10. For example, the thickness of the adhesive tape can usually be greater than or equal to 100μm, which can meet the requirements for insulation, thermal conductivity, expansion buffering, and other properties.

[0144] The bare cell 12 may have multiple surfaces. For example, the bare cell 12 may have a surface near the bottom of the cell along the direction of gravity, or the bare cell 12 may have a side surface parallel to the direction of gravity.

[0145] Accordingly, the housing 11 may have multiple walls, each corresponding to a multiple surface of the bare cell 12. The tape 13 may cover the multiple surfaces of the bare cell 12, thereby ensuring that the bare cell 12 and the housing 11 are mutually insulated, and improving the reliability of the cell 10.

[0146] like Figure 4 and Figure 5 As shown, where, Figure 4 for Figure 2 The top view of cell 10 shown. Figure 5 for Figure 4The cross-sectional view of the battery cell shown along section line A-A' shows that the housing 11 has a first wall 111 that is perpendicular to the direction of gravity and close to the bottom of the battery cell, that is, the first wall 111 can be the bottom wall of the housing 11. The bare battery cell 12 has a first surface 121 that is correspondingly provided to the first wall 111, that is, the first surface 121 is the surface of the bare battery cell 12 that faces and is close to the first wall 111.

[0147] It should be understood that the battery cell 10 can be placed in various ways, and the bottom wall can be the wall of the casing 11 near the bottom in the direction of gravity, regardless of the placement of the battery cell 10. For example, as Figure 2 As shown, the battery cell 10 can stand upright normally, with the opening of the casing 11 facing upwards and the cover 14 covering the opening. The bottom wall can then be the wall within the casing 11 opposite to the cover 14. For example, as... Figure 6 As shown, the battery cell 10 can be placed on its side, meaning the cover 14 is parallel to the direction of gravity. In this case, the bottom wall is a wall in the housing 11 adjacent to the cover 14. Regardless of how the battery cell 10 is placed, the bottom wall is always the wall where the battery cell 10 is located near the bottom in its current position. For example, as... Figure 7 As shown, the battery cell 10 can also be laid flat, meaning that the bottom wall is the largest wall in the casing 11 and is perpendicular to the direction of gravity.

[0148] The number of layers of adhesive tape 13 adhered to different surfaces of the bare cell 12 can be the same or different, and the specific number of layers of adhesive tape 13 can be adjusted according to actual needs. For example, one or more layers of adhesive tape 13 can be adhered to the bottom surface of the bare cell 12, and the adhesive tape 13 can directly or indirectly support the bare cell 12.

[0149] like Figure 5 As shown, the tape 13 may include a first tape 1301, which is disposed between the first surface 121 and the first wall 111 and covers the first surface 121. The bare battery cell 12 abuts against the first wall 111 through the first tape 1301.

[0150] The bare battery cell 12 is abutted against the first wall 111 by the first adhesive tape 1301. The first adhesive tape 1301 can isolate the first surface 121 of the bare battery cell 12 from the first wall 111. When the housing 11 is made of metal, it can reduce the risk of the housing 11 becoming electrified and corroded due to direct contact between the bare battery cell 12 and the housing 11. Furthermore, the first wall 111 is the bottom wall of the housing 11, and the first surface 121 is set opposite to the first wall 111, that is, the first adhesive tape 1301 is set at the bottom surface of the bare battery cell 12. The first adhesive tape 1301 can replace other supporting components such as bottom plates and provide support for the bare battery cell 12, thereby improving the internal space utilization of the battery cell 10 and increasing the energy density of the battery cell 10.

[0151] Especially when the battery cells are placed on one side, such as Figure 6 As shown, the cover 14 is set parallel to the direction of gravity, so the tabs on the bare cell 12 are also set towards the cover 14. When the cell 10 is placed on its side, the bare cell 12 has a certain displacement under the action of gravity, thus abutting against the bottom wall of the cell 10 in the side-placed state. However, since the tabs are connected to the terminals on the cover 14, the end of the bare cell 12 with the tabs is suspended by the terminals through the tabs and cannot abut against the bottom wall of the housing 11. This causes the end of the bare cell 12 near the cover 14 to tilt slightly upward, while a local area of ​​the end of the bare cell 12 away from the cover 14 abuts against the first wall 111 in the housing 11. That is, there is an angle between the surface of the bare cell 12 near the cover 14 and the plane where the cover 14 is located. This causes the area of ​​the first surface 121 that abuts against the first wall 111 of the housing 11 to be severely stressed locally, which can easily lead to lithium plating of the bare cell 12 and deteriorate its lifespan. However, by setting a first tape 1301 on the first surface 121, especially in areas of the first surface 121 where local stress is severe, the tape provides a buffer for these areas, creating a soft compression between these areas and the housing 11, thereby reducing local stress on the bare cell 12 and further improving the lifespan of the cell 10.

[0152] In addition, the expansion layer 133 of the tape 13 is filled with inorganic material, which has high hardness, thereby improving the support strength of the tape 13. This allows the tape 13 to replace other support components such as the base plate to support the bare battery cell, thereby improving the stability and reliability of the battery cell 10.

[0153] In some embodiments, the two adjacent walls in the housing 11 are generally chamfered. However, the chamfer is prone to interference with the bare cell 12. When the bare cell 12 located in the chamfered area collides with the chamfer, it is easy to cause defects such as powder shedding and lithium plating, which affects the cycle life of the cell 10.

[0154] Therefore, the first tape 1301 can have a certain thickness, allowing the bare battery cell 12 to be raised by directly abutting against the first wall 111 via the first tape 1301, thereby reducing the interference caused by the chamfer formed between the first wall 111 and other adjacent walls in the housing 11 to the bare battery cell 12. In this embodiment, the housing 11 may also have a second wall 112 adjacent to the first wall 111. The second wall 112 can be a side wall of the housing 11, and a chamfer is formed between the second wall 112 and the first wall 111. The thickness of the first tape 1301 is greater than or equal to the radius of the chamfer, where the radius of the chamfer can be understood as the dimension of the arc region forming the chamfer along the thickness direction of the first tape 1301.

[0155] The side wall of the housing 11 can refer to any wall in the housing 11 that is parallel to the direction of gravity, and the side wall of the housing 11 is arranged adjacent to the bottom wall. It should be understood that regardless of how the battery cell 10 is placed, for example, the battery cell 10 can be placed upright, on its side, or lying down, the side wall refers to the wall in the housing 11 that is parallel to the direction of gravity.

[0156] The housing 11 may also have multiple second walls 112 adjacent to the first wall 111. Multiple chamfers exist between these walls and the first wall 111, so the thickness of the first tape 1301 can be greater than or equal to the radius of the largest chamfer. For example, the second wall 112 of the housing 11 includes a first sub-sidewall and a second sub-sidewall, which are adjacent to each other. The chamfer between the first sub-sidewall and the first wall 111 is a first chamfer with a height of h1. The chamfer between the second sub-sidewall and the first wall 111 is a second chamfer with a height of h2. The heights h1 and h2 of the first and second chamfers may be equal or unequal, so the thickness of the first tape 1301 can be greater than or equal to max{h1, h2}.

[0157] By setting a certain thickness for the first tape 1301, making the thickness of the first tape 1301 greater than the radius of the chamfer, the bare cell 12 can directly abut against the first wall 111 of the housing 11 through the first tape 1301. This can reduce the risk of powder shedding and lithium plating caused by the collision between the bare cell 12 and the chamfer, improve the reliability of the cell 10, and also reduce the use of additional support components, optimize the internal space of the cell 10, and improve the energy density of the cell 10.

[0158] The thickness of the first tape 1301 can be adjusted according to the actual size of the shell 11 and the design of the chamfer. In some embodiments, the thickness of the first tape 1301 is generally greater than or equal to 250μm to meet the support function of the bare cell 12 and reduce the interference between the bare cell 12 and each chamfer.

[0159] It should be understood that the first tape 1301 is the tape adhered to the first surface 121. The first tape 1301 may have one or more layers, and each layer of the first tape 1301 includes an adhesive layer 131, a thermally conductive layer 132, and an expansion layer 133. The thickness of the first tape 1301 may refer to the thickness of a single layer of tape or the total thickness of multiple layers of tape stacked together.

[0160] In addition to attaching one or more layers of tape 13 to the first surface 121 of the bare cell 12, one or more layers of tape can also be attached to the side of the bare cell 12. For example, multiple layers of tape 13 can be attached to the side of the bare cell 12 so that the tape 13 completely fills the gap between the side and the casing 11. Alternatively, one or more layers of tape 13 can be attached to the side of the bare cell 12, leaving a certain gap between the tape 13 and the casing 11 to allow for expansion space for the bare cell 12. When the cell 10 is fully charged, the bare cell 12 expands, thereby allowing the tape to completely fill the gap between the bare cell 12 and the casing 11.

[0161] It should be understood that a full charge refers to the state in which a battery cell is charged to the set maximum allowable voltage or capacity, at which point the cell's state of charge (SOC) is 100%. Conversely, a non-full charge refers to the state in which a battery cell is charged to a capacity lower than its full charge. The state of charge (SOC) is a key parameter describing the current remaining capacity of a battery, usually expressed as a percentage (%), and is used to measure the real-time energy state of the battery from fully discharged (0%) to fully charged (100%).

[0162] In the embodiments of this application, reference continues to be made to Figure 5 The bare cell 12 may also have a second surface 122, which is the surface of the bare cell 12 facing and close to the second wall 112. The adhesive tape covering the second surface 122 of the bare cell 12 is a second adhesive tape 1302. The thickness of the second adhesive tape 1302 before absorbing electrolyte and expanding is less than the distance between the second surface 122 and the second wall 112, or further, the thickness of the second adhesive tape 1302 after absorbing electrolyte and expanding is less than the distance between the second surface 122 and the second wall 112. In this way, during the use of the cell 10, a certain buffer space can be provided for the expansion of the bare cell 12.

[0163] Furthermore, when cell 10 is fully charged, the bare cell 12 expands and deforms to the greatest extent, generating more heat that tends to accumulate inside. Therefore, the dimensional changes of the bare cell 12 can be detected in both the non-fully charged and fully charged states of cell 10. Based on this, a tape 13 with a suitable expansion rate can be selected, and the thickness of the tape 13 covering the outer surface of the bare cell 12 can be designed. This ensures that in the non-fully charged state, there is a certain gap between the bare cell 12 and the casing 11, allowing space for the expansion of the bare cell 12. In the fully charged state, the large expansion of the bare cell 12 causes the tape 13 to completely fill the gap between the bare cell 12 and the casing 11, allowing the heat inside the bare cell 12 to be directly conducted to the casing 11 through the tape 13, thus accelerating heat conduction and improving the fast charging performance of cell 10.

[0164] It should be understood that the tape 13 fills the gap between the bare battery cell 12 and the housing 11, that is, the tape 13 is in contact with the housing 11, or the distance between the bare battery cell 12 and the housing 11 is equal to the thickness of the tape 13, and the difference between the two can fluctuate within the range of ±0.05mm.

[0165] In some embodiments, when the battery cell 10 is not fully charged, there is a gap between the second tape 1302 and the second wall 112; when the battery cell 10 is fully charged, the second tape 1302 and the second wall 112 are in close contact, that is, the second tape 1302 and the second wall 112 are in a state of no gap and fully adhered.

[0166] In this embodiment, when the battery cell 10 is not fully charged, the second tape 1302 does not completely fill the gap between the second surface 122 and the second wall 112, which can reserve a certain expansion space for the battery cell 10, allowing the battery cell 10 to "breathe" freely during charging and discharging. When the battery cell 10 is fully charged, since the battery cell 10 expands the most and generates the most heat, the contact between the second tape 1302 and the second wall 112 allows the heat inside the bare battery cell 12 to be directly conducted away through the second tape 1302, avoiding the accumulation of heat inside and affecting the fast charging performance of the battery cell 10. Furthermore, the thermal conductivity of the expansion layer 133 after absorbing the electrolyte is further improved, thereby further improving the heat conduction speed. In addition, since the expansion layer 133 in the tape 13 absorbs the electrolyte, the second tape 1302 covering the second surface 122 can store a certain amount of electrolyte, providing additional electrolyte for the bare cell 12 in this area, and providing a soft compression space for the bare cell 12, avoiding direct hard compression between the bare cell 12 and the casing 11, which would affect the charge and discharge performance of the cell 10, thereby improving the cycle life of the cell 10.

[0167] It should be understood that the housing 11 may have one or more similar second walls 112, and the bare cell 12 may also have one or more similar second surfaces 122. Taking the square cell 10 as an example, the housing 11 may have two oppositely arranged second walls 112, and the bare cell 12 may also have two oppositely arranged second surfaces 122, with the two second surfaces 122 respectively covered with second adhesive tape 1302.

[0168] In some embodiments, the surface of the bare cell 12 with greater expansion can reduce the thickness of the adhesive tape 13, thereby allowing more space for the expansion and deformation of the bare cell 12. For example, the direction perpendicular to the wall with the largest area in the housing 11 is often the direction with the greatest expansion and deformation. Figure 5 and Figure 8 As shown, where, Figure 8 for Figure 4The cross-sectional view of the battery cell 10 along section line B-B' shows that the second wall 112 may include a first sub-sidewall and a second sub-sidewall. The area of ​​the first sub-sidewall is smaller than the area of ​​the second sub-sidewall. That is, the sidewalls of the housing 11 may include a smaller first sub-sidewall and a larger second sub-sidewall. The first and second sub-sidewalls may be arranged adjacent to each other. Correspondingly, the second surface 122 of the bare battery cell 12 may also include a first sub-surface and a second sub-surface, and the second adhesive tape 1302 also includes a first adhesive tape and a second adhesive tape. The first sub-surface and the second sub-surface face the first and second sub-sidewalls respectively, and the first and second adhesive tapes cover the first and second sub-surfaces respectively. When the battery cell 10 is not fully charged, the distance between the second adhesive tape 1302 and the second wall 112 includes a first distance and a second distance. There is a first distance between the first sub-adhesive tape and the first sub-sidewall, and there is a second distance between the second sub-adhesive tape and the second sub-sidewall, and the second distance is greater than the first distance.

[0169] In this embodiment, the area of ​​the second sub-sidewall is larger than that of the first sub-sidewall. During the charging and discharging process of the cell 10, the expansion of the second sub-sidewall is greater. Therefore, reserving more space between the second sub-sidewall and the second sub-surface can provide a buffer for the expansion of the bare cell 12.

[0170] In some embodiments, when the battery cell 10 is fully charged, the first sub-tape and the first sub-sidewall are in close contact, and the second sub-tape and the second sub-sidewall are in close contact, that is, there is no gap between them and they are fully bonded. This allows the heat inside the bare battery cell 12 to be directly conducted away through the first and second sub-tapes, preventing heat from accumulating inside and affecting the fast charging performance of the battery cell 10. Furthermore, the expansion layer 133 of the first and second sub-tapes can absorb and store a certain amount of electrolyte, providing additional electrolyte for the bare battery cell 12 in this area. The expansion of the first and second sub-tapes through liquid absorption can also provide a soft compression space for the bare battery cell 12, preventing the bare battery cell 12 from being directly and rigidly compressed with the casing 11, which would affect the charging and discharging performance of the battery cell 10, thereby improving the cycle life of the battery cell 10.

[0171] It should be understood that the housing 11 may have one or more similar first sub-tapes and second sub-tapes, and the bare cell 12 may also have one or more similar first sub-surfaces and second sub-surfaces. Taking the square cell 10 as an example, the housing 11 may have two oppositely arranged first sub-sidewalls and two oppositely arranged second sub-sidewalls, and the bare cell 12 may also have two oppositely arranged first sub-surfaces and two oppositely arranged second sub-surfaces, with the two first sub-surfaces each covered with a first sub-tape and the two second sub-surfaces each covered with a second sub-tape.

[0172] In addition, the tape 13 can also provide a transport path for the electrolyte. For example, the tape located on the side of the bare cell 12 can transport the electrolyte near the bottom of the bare cell 12 to the top of the bare cell 12. Even if the electrolyte is gradually consumed as the cell 10 is used, the expansion layer 133 of the tape 13 absorbs and transports the electrolyte, so that there is electrolyte in various positions of the bare cell 12, especially the top of the bare cell 12, thereby improving the overall life performance of the cell 10.

[0173] Continue to refer to Figure 8 The housing 11 also has a third wall 113, which is the top wall of the housing 11. That is, the third wall 113 is disposed opposite to the first wall 111. Correspondingly, the bare cell 12 also has a third surface 123 facing and close to the third wall 113. The third tape 1303 is the tape covering the third surface 123. That is, the third tape 1303 covers the top surface of the bare cell 12. The third tape 1303 can absorb electrolyte, thereby providing more storage space for electrolyte in the cell 10. Especially as the cell 10 is used, the electrolyte is continuously consumed, causing the top of the bare cell 12 to not be completely immersed in the electrolyte. The third tape 1303 can provide additional electrolyte to the top of the bare cell 12, thereby improving the charge and discharge performance of the cell 10 and prolonging the cycle life of the cell 10.

[0174] When 10 battery cells are placed vertically, such as Figure 8 As shown, the third wall 113 can be the wall where the cover 14 is located. When the battery cell 10 is laid flat, as... Figure 7 As shown, the third wall 113 can be the wall with the largest area in the housing 11. When the cell 10 is placed on its side, as... Figure 6 As shown, the third wall 113 can be the wall in the shell 11 that is adjacent to the wall with the largest area and the wall where the cover 14 is located.

[0175] The electrolyte can completely or partially wet the second adhesive tape 1302. For example, as the cell 10 is used, the electrolyte is continuously consumed, causing the portion of the second adhesive tape 1302 located on the side of the bare cell 12 that is wetted in the electrolyte to gradually decrease. The second adhesive tape 1302 is at least partially wetted in the electrolyte, thus providing a transport path for the electrolyte, allowing it to be transferred from the bottom to the top of the bare cell 12, thereby providing additional electrolyte to the top of the bare cell 12 and improving the lifespan of the cell 10.

[0176] In some embodiments, when the third surface 123 of the bare cell 12 is covered with a third adhesive tape 1303, the second adhesive tape 1302 can transfer electrolyte to the third adhesive tape 1303, thereby continuously supplying electrolyte to the third adhesive tape 1303. Even as the electrolyte is continuously consumed, electrolyte can still be supplied to the top of the bare cell 12, ensuring that electrolyte is present at all locations of the bare cell 12, thus improving the lifespan of the cell 10. Specifically, the electrolyte can be transferred near the top of the bare cell 12 through the expansion layer in the adhesive tape 13, thereby improving the lifespan performance of the cell 10.

[0177] It should be understood that the above embodiments can be independent solutions, and different embodiments can also overlap.

[0178] Next, we will describe the case of a square aluminum-cased battery cell 10 standing upright, with the tape 13 completely covering all five outer surfaces of the bare battery cell 12 except for the surface with the tabs. The five outer surfaces of the bare battery cell 12 are a first surface 121 located at the bottom of the bare battery cell 12, and four second surfaces 122 adjacent to the first surface 121, consisting of two second sub-surfaces and two second sub-surfaces arranged opposite each other. The internal dimension of the casing 11 along the thickness direction of the battery cell 10 is 50 mm, and the internal dimension of the casing 11 along the width direction of the battery cell 10 is 200 mm. When the battery cell 10 is fully charged, the dimension of the bare battery cell 12 along the thickness direction is 48.4 mm, and the dimension of the bare battery cell 12 along the width direction is 198.1 mm. Calculations show that, under full charge, the gap between the bare cell 12 and the casing 11 in the width direction of the cell 10 is 200mm-198.1mm=1.9mm, and the gap between the bare cell 12 and the casing 11 in the thickness direction of the cell 10 is 50mm-48.4mm=1.6mm.

[0179] The thickness of the adhesive layer 131 of the tape 13 is set to 8 μm, the thickness of the thermally conductive layer 132 is set to 56 μm, the thickness of the expansion layer 133 is set to 48 μm, and the expansion rate of the expansion layer 133 is set to 200%, that is, after absorbing the electrolyte, the overall thickness of the tape 13 is 160 μm.

[0180] The first tape 1301, the first sub-surface, and the second sub-surface of the bare battery cell 12 are all made of the aforementioned tape with a thickness of 160μm.

[0181] Two layers of adhesive tape 13 can be adhered to the first surface 121. The thickness of the first adhesive tape 1301 on the first surface 121 is 320μm. This allows the first adhesive tape 1301 to isolate the bare cell 12 from the casing 11, while also supporting the bare cell 12. Furthermore, the first adhesive tape 1301 can provide a buffer space for the bare cell 12, and the heat inside the bare cell 12 can be directly conducted away through the first adhesive tape 1301, thereby improving the overall performance of the cell 10.

[0182] Six layers of tape 13 can be pasted on each of the two first sub-surfaces, that is, the thickness of the first sub-tape on each first sub-surface is 960μm, and the total thickness of the first sub-tape is 1.92mm.

[0183] Five layers of tape 13 can be pasted on each of the two second sub-surfaces, that is, the thickness of the second sub-tape on each second sub-surface is 800μm, and the total thickness of the second sub-tape is 1.6mm.

[0184] Adhesive tape 13 is pasted on the first and second sub-surfaces so that when the battery cell 10 is fully charged, it can fill the gap between the bare battery cell 12 and the casing 11, thereby ensuring that the bare battery cell 12 is insulated from the casing 11. At the same time, the heat-conducting layer 132 and the liquid-absorbing expansion layer 133 in the adhesive tape 13 can conduct heat out of the bare battery cell 12, thereby improving the fast charging performance of the battery cell 10.

[0185] This application embodiment also provides an adhesive tape 13, including an adhesive layer 131, a thermally conductive layer 132, and an expansion layer 133, wherein the thermally conductive layer 132 and the expansion layer 133 are both polymer materials. The arrangement of each layer of this adhesive tape 13 is the same as described above, and will not be repeated here.

[0186] This application embodiment also provides a battery pack 110, which may include one or more of the aforementioned battery cells 10. The multiple battery cells 10 can be connected in series or in parallel, for example, by connecting the terminals of the battery cells 10 via a busbar, thus connecting the multiple battery cells 10 in series or in parallel. The battery pack 110 may also include components such as a battery management system 20, which is connected to the battery cells 10. The battery management system 20 is used to control and monitor the parameters of the battery cells 10 and maintain the performance and safety of the battery cells 10.

[0187] This application embodiment also provides an electronic device 100, which may include one or more of the battery packs 110 described above, or one or more of the battery cells 10 described above, or the tape 13 described above.

[0188] In some embodiments, such as Figure 9As shown, the electronic device 100 may include one or more of the battery packs 110 and loads 140 described above, with the battery packs 110 supplying power to the loads 140.

[0189] This application embodiment also provides an energy storage device 200, including one or more battery packs 110 as described above, or including one or more battery cells 10 as described above, or including the tape 13 as described above.

[0190] In some embodiments, such as Figure 10 As shown, the energy storage device 200 may include multiple battery packs 110 as described above and a power converter 210. The power converter 210 is used to convert the voltage output from the battery packs 110 and output it to the power grid or an external load, and / or, the power converter 210 is used to convert the voltage output from an external power source and output it to the battery packs 110. The energy storage device 200 can be a charging pile, a site backup power supply, a mobile base station power supply, etc., or it can be an energy storage device 200 in scenarios such as home energy storage, industrial and commercial energy storage, and distributed energy storage. This application does not limit it.

[0191] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electric cell, characterized by, It includes a housing (11), a bare battery cell (12), an electrolyte, and an adhesive tape (13). The bare battery cell (12) and the electrolyte are housed inside the housing (11), and the bare battery cell (12) is immersed in the electrolyte. The tape (13) covers the outer surface of the bare battery cell (12). The tape (13) includes an adhesive layer (131), a thermally conductive layer (132), and an expansion layer (133). The adhesive layer (131), the thermally conductive layer (132), and the expansion layer (133) are arranged sequentially along the outer surface away from the bare battery cell (12). The expansion layer (133) absorbs the electrolyte and expands. The thermally conductive layer (132) and the expansion layer (133) are both made of polymer materials.

2. The electric cell of claim 1, wherein, The expansion layer (133) is filled with inorganic material.

3. The electric cell of claim 2, wherein, The inorganic material has a Mohs hardness greater than or equal to 4.

4. The battery cell according to claim 2, characterized in that, The inorganic materials include silicon dioxide, aluminum oxide, cubic boron nitride, silicon carbide, silicon nitride, or tungsten carbide.

5. The electric cell of claim 1, wherein, The expansion rate α of the expansion layer (133) ranges from 150% to 400%.

6. The electric cell of claim 1, wherein, The material of the expansion layer (133) includes rubber, polystyrene or polyester.

7. The electric cell of claim 1, wherein, The thermal conductivity of the thermally conductive layer (132) is greater than 1 W / mk.

8. The electric cell of claim 1, wherein, The material of the thermally conductive layer (132) includes polyacetylene, polyaniline or polythiophene.

9. The battery cell according to claim 1, characterized in that, The thickness T of the heat-conducting layer (132) is in the range of 50 pm ≤ T < 80 pm. D The thickness T of the heat-conducting layer (132) is in the range of 50 pm ≤ T < 80 pm. D The thickness T of the heat-conducting layer (132) is in the 10. The electric cell of any one of claims 1 to 9, wherein, The housing (11) has a first wall (111), which is the bottom wall of the housing (11); The bare cell (12) has a first surface (121), which is the surface of the bare cell (12) facing and close to the first wall (111); The tape (13) includes a first tape (1301) which covers the first surface (121) and the bare cell (12) abuts against the first wall (111) through the first tape (1301).

11. The electric cell of claim 10, wherein, The housing (11) also has a second wall (112) which is adjacent to the first wall (111) and has a chamfer between the second wall (112) and the first wall (111), and the thickness of the first tape (1301) is greater than or equal to the radius of the chamfer.

12. The electric cell of claim 11, wherein, The thickness of the first tape (1301) is greater than or equal to 250 μm.

13. The electric cell of any one of claims 1 to 9, wherein, The housing (11) also has a second wall (112), which is a side wall of the housing (11); The bare cell (12) also has a second surface (122), which is the surface of the bare cell (12) facing and close to the second wall (112); The tape (13) further includes a second tape (1302) which covers the second surface (122); When the battery cell (10) is fully charged, the second tape (1302) is in contact with the second wall (112); When the battery cell (10) is not fully charged, there is a gap between the second tape (1302) and the second wall (112).

14. The electric cell of claim 13, wherein, The second wall (112) includes a first sub-side wall and a second sub-side wall, wherein the first sub-side wall is the side wall with the smallest area of ​​the shell (11), and the second sub-side wall is the side wall with the largest area of ​​the shell (11); The second surface (122) includes a first sub-surface and a second sub-surface, the first sub-surface facing the first sub-sidewall and the second sub-surface facing the second sub-sidewall; The second tape (1302) includes a first sub-tape and a second sub-tape, the first sub-tape and the second sub-tape respectively covering the first sub-surface and the second sub-surface; When the battery cell (10) is not fully charged, there is a first gap between the first sub-tape and the first sub-sidewall, and there is a second gap between the second sub-tape and the second sub-sidewall, and the second gap is greater than the first gap.

15. The electric cell of any one of claims 1 to 9, wherein, The thickness of the tape (13) is greater than or equal to 100 μm.

16. A type of adhesive tape, characterized in that, include: The adhesive layer (131), the thermally conductive layer (132), and the expansion layer (133) are all made of polymer materials.

17. The adhesive tape of claim 16, wherein The expansion layer (133) is filled with inorganic material.

18. The adhesive tape of claim 17, wherein, The inorganic material has a Mohs hardness greater than or equal to 4.

19. The adhesive tape of claim 16, wherein, The material of the expansion layer (133) includes rubber, polystyrene or polyester.

20. The adhesive tape of claim 16, wherein, The material of the thermally conductive layer (132) includes polyacetylene, polyaniline or polythiophene.

21. The adhesive tape of claim 16, wherein, The thickness T of the heat-conducting layer (132) is in the range of 50 pm ≤ T ≤ 80 pm. D The thickness T of the heat-conducting layer (132) is in the range of 50 pm ≤ T ≤ 80 pm. D The thickness T of the heat-conducting layer (132) is in the 22. The adhesive tape according to any one of claims 16 to 21, characterized in that, The thickness of the tape (13) is greater than or equal to 100 μm.

23. An electronic device, characterized in that, It includes one or more battery cells (10) according to any one of claims 1 to 15, or includes tape (13) according to any one of claims 16 to 22.

24. An energy storage device, comprising: It includes one or more battery cells (10) according to any one of claims 1 to 15, or includes tape (13) according to any one of claims 16 to 22.

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