Pouch battery and electronic device

Abstract

The utility model discloses a kind of soft package battery and electronic equipment, the soft package battery includes shell and electric core, electric core is located in the shell, and the outer surface of electric core is formed with the inner surface of shell between Hardcoat with the hardness greater than electric core and shell, one side of Hardcoat is attached to the inner surface of shell, and the other side is attached to the outer surface of electric core.The utility model soft package battery is formed with the Hardcoat with the hardness greater than electric core and shell between electric core and shell, one side of Hardcoat is attached to the inner surface of shell, and the other side is attached to the outer surface of electric core, can provide mechanical support for the electric core with low stiffness, to resist the external force received in production preparation stage and stress released in cycle performance test process, prevent the case of pot cover deformation, improve electric core appearance qualified rate, prevent internal electrode, diaphragm extrusion, guarantee electrochemical performance stability and use safety.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a soft-pack battery and electronic device. Background Technology

[0002] Lithium batteries, as energy storage devices that encompass electrochemical systems including metallic lithium, lithium alloys, lithium ions, and lithium polymers, have become the mainstream energy storage solution for consumer electronics products (such as smartphones and wearable devices) due to their core advantages of high energy density, long cycle life, and low self-discharge rate. Their application scenarios and market demand continue to expand.

[0003] To meet the demand for thinner and lighter electronic products, thin-cell pouch batteries (hereinafter referred to as "thin cells") have become a key research and development direction. Thin cells are characterized by fewer layers and thinner thickness, and they need to maintain a high energy density (ED) to ensure energy storage performance. This characteristic enables them to effectively reduce the overall volume of lithium batteries, which meets the stringent requirements of electronic products for internal space, and has significant potential for application in thin and light devices.

[0004] However, thin battery cells, due to their low rigidity and weak resistance to deformation, are prone to "pot lid deformation" when subjected to external forces during the manufacturing process and when stress is released during cycle performance testing. This manifests as one side of the cell being concave and the other convex, resulting in an overall shape resembling a pot lid. Such deformation not only leads to abnormal appearance, directly reducing the cell appearance pass rate during production, but may also compress internal core structures such as electrodes and separators, posing a potential risk to electrochemical performance stability and safety in use. Utility Model Content

[0005] The main purpose of this invention is to propose a soft-pack battery that aims to solve the technical problem that the thin battery cells have low rigidity and are prone to deformation when subjected to external forces during the production and preparation stage and when stress is released during cycle performance testing.

[0006] To achieve the above objectives, this utility model proposes a soft-pack battery, which includes a casing and a battery cell. The battery cell is disposed inside the casing. A hard coating with a hardness greater than that of the battery cell and the casing is formed between the outer surface of the battery cell and the inner surface of the casing. One side of the hard coating is attached to the inner surface of the casing, and the other side is attached to the outer surface of the battery cell.

[0007] Optionally, the inner surface of the housing is coated with a first coating, and the outer surface of the battery cell is coated with a second coating that is offset from the first coating. The second coating and the first coating are combined and melted and cured to form the hard coating.

[0008] Optionally, one of the first coating and the second coating is arranged in a grid pattern, and the other is arranged in an array pattern.

[0009] Optionally, the first coating includes a plurality of first sub-coatings arranged in strips, and the second coating includes a plurality of second sub-coatings arranged in strips.

[0010] Along the width or height direction of the outer shell, the plurality of first sub-coatings and the plurality of second sub-coatings are alternately combined.

[0011] Optionally, the housing includes an aluminum-plastic film with an inner pit, the surface of which is coated with the hard coating.

[0012] Optionally, the thickness of the hard coating is 20 μm to 40 μm.

[0013] Optionally, the outer surface of the battery cell includes a first flat region and a second flat region disposed opposite to each other along its thickness direction;

[0014] At least one of the first flat region and the second flat region is coated with the hard coating.

[0015] Optionally, the outer surface of the battery cell further includes a first corner region and a second corner region disposed opposite to each other along its width direction;

[0016] At least one of the first corner area and the second corner area is covered with the hard coating.

[0017] Optionally, the battery cell includes a first electrode, a separator, and a second electrode that are stacked and wound together.

[0018] The first electrode includes a current collector and an active material layer. The current collector has a coating area and an empty foil area distributed along its length. The active material layer is coated on the coating area. The empty foil area is exposed on the outermost ring of the battery cell. The hard coating layer is attached to the empty foil area.

[0019] This invention also proposes an electronic device comprising a pouch battery as described above.

[0020] This utility model of a soft-pack battery has a hard coating with a hardness greater than that of the cell and the outer casing. One side of the hard coating is attached to the inner surface of the outer casing, and the other side is attached to the outer surface of the cell. This provides mechanical support for the low-rigidity cell to resist external forces during the production and preparation stage and stresses released during cycle performance testing, preventing the cell from deforming, improving the cell's appearance qualification rate, preventing internal electrodes and separators from being squeezed, and ensuring stable electrochemical performance and safe use. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the structure of a soft-pack battery in one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a soft-pack battery cell in one embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the outer casing of a soft-pack battery in one embodiment of the present invention;

[0024] Explanation of icon numbers:

[0025] 100 pouch battery 110 shell 120 battery cells 130 Hard coating 131 First coating 132 Second coating P1 First Straight Zone P2 Second Straight Zone G1 First corner area G2 Second corner area

[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0030] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0031] This utility model embodiment provides a soft-pack battery 100, referring to... Figure 1 The soft-pack battery 100 includes a casing 110 and a battery cell 120, with the battery cell 120 disposed inside the casing 110. A hard coating 130 with a hardness greater than that of the battery cell 120 and the casing 110 is formed between the outer surface of the battery cell 120 and the inner surface of the casing 110. One side of the hard coating is attached to the inner surface of the casing 110, and the other side is attached to the outer surface of the battery cell 120.

[0032] Specifically, the outer casing 110 serves as a protective and housing structure for the pouch battery 100, providing a stable internal environment for the battery cell 120 and preventing it from being subjected to external physical damage and chemical corrosion. Its material can be selected according to actual application requirements; for example, the outer casing 110 can be made of aluminum-plastic film. The shape and size of the outer casing 110 must be compatible with the shape and size of the battery cell 120 to ensure that the battery cell 120 can be securely installed within the outer casing 110, while also meeting the installation requirements of different electronic products regarding the shape of the pouch battery 100.

[0033] Cell 120 is the core energy storage component of the pouch battery 100, located within the casing 110. Cell 120 adopts a thin lithium pouch battery cell 120 structure, characterized by fewer layers, thinner thickness, and higher energy density. This effectively reduces the overall size of the pouch battery 100 while meeting the energy storage requirements of electronic products, adapting to the slim and lightweight design of electronic products. Specific types of cell 120 may include lithium-ion thin cells, lithium polymer thin cells, etc. Its internal structures, such as electrodes, separators, and electrolytes, are designed and assembled according to existing mature manufacturing processes for thin cells 120 to ensure good electrochemical performance.

[0034] The hard coating 130 is formed between the outer surface of the cell 120 and the inner surface of the casing 110. Its specific location can be selected based on the areas of the cell 120 prone to deformation. It can either cover the entire outer surface of the cell 120 and fully connect with the inner surface of the casing 110, or it can only cover key areas of the outer surface of the cell 120 prone to deformation (such as the central or edge areas) and connect with the corresponding areas of the inner surface of the casing 110. The material of the hard coating 130 needs to have high hardness and good adhesion, such as materials whose main components are polystyrene, polyvinyl chloride, and polyurethane, which soften and flow at high temperatures and harden and solidify at lower temperatures. The thickness of the hard coating 130 needs to be reasonably designed according to the actual application scenario, typically controlled between a few micrometers and tens of micrometers. This ensures that the hard coating 130 has sufficient supporting strength while avoiding increasing the overall thickness of the pouch battery 100 due to excessive thickness, thus affecting the adaptability of the pouch battery 100 to the thinner and lighter design of electronic products. The two opposite sides of the hard coating are respectively attached to the inner surface of the housing 110 and the outer surface of the battery cell 120. The hard coating 130 is attached to the outer surface of the battery cell 120 and the inner surface of the housing 110 by a coating process (such as spraying, roller coating, dip coating, etc.). The hard coating 130 material is directly coated on the outer surface of the battery cell 120 and / or the inner surface of the housing 110. After the hard coating is cured, the connection between the two is achieved.

[0035] In this embodiment, the soft-pack battery 100 has a hard coating 130 with a hardness greater than that of the battery cell 120 and the outer surface of the outer casing 110, which is provided between the outer surface of the battery cell 120 and the inner surface of the outer casing 110. Its working principle is mainly based on the supporting and constraining effect of the hard coating 130, as detailed below:

[0036] During the manufacturing stage of the pouch battery 100, when the cell 120 is subjected to external forces such as transfer and assembly into the casing, the hard coating 130, with its high hardness and rigidity, can serve as a support structure between the cell 120 and the casing 110. This effectively disperses and withstands the external forces applied to the cell 120, preventing direct force action on the cell 120 body and thus avoiding deformation. Simultaneously, the hard coating 130 is tightly connected to the outer surface of the cell 120 and the inner surface of the casing 110, providing a certain degree of constraint on the displacement and deformation of the cell 120, preventing excessive movement and deformation within the casing 110.

[0037] During the cycle performance test of the pouch battery 100, a charge-discharge chemical reaction occurs inside the cell 120, generating and releasing certain stress. If this stress is not effectively relieved and dispersed, it can easily lead to "pot lid deformation" of the cell 120. The presence of the hard coating 130, with its high rigidity, can resist the change in the shape of the cell 120 caused by the stress released inside the cell, thereby effectively suppressing the occurrence of "pot lid deformation" of the cell 120.

[0038] In addition, the hard coating 130 can also form an isolation and protective structure between the cell 120 and the casing 110, reducing direct friction and collision between the cell 120 and the casing 110, preventing damage to the outer surface of the cell 120 due to friction, and further ensuring the structural integrity and electrochemical performance stability of the cell 120.

[0039] The Rockwell hardness of the hard coating 130 can be 35-55. For example, the Rockwell hardness of the hard coating 130 can be 35, 36, 37, 38, 39, 40, 41, 42, 43, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, or 55, or fall within any two of the above values. The main component of the hard coating 130 (see the aforementioned example) has a Rockwell hardness range of 60-90. It is prepared by adding additives (such as polyvinyl alcohol formal) and solvents (such as chlorinated hydrocarbons) to form a liquid that is sprayed or brushed onto the outer surface of the battery cell 120 and the inner surface of the casing 110. Additives are added in a certain proportion to control the Rockwell hardness range to 35-55, ensuring that the Rockwell hardness of the hard coating 130 is greater than that of the casing 110 (e.g., aluminum-plastic film, Rockwell hardness 14-16).

[0040] That is, by setting a hard coating 130 between the outer surface of the cell 120 and the inner surface of the casing 110, the hard coating 130, with its higher hardness and rigidity than the cell 120 and the casing 110, can effectively resist the external force during the production and preparation stage and the stress released inside the cell 120 during the cycle performance test, improve the deformation resistance of the thin cell 120, prevent the pot lid from deforming, thereby improving the appearance qualification rate of the cell 120, preventing the internal electrodes and diaphragms from being squeezed, and ensuring the stability of electrochemical performance and safety of use.

[0041] In some embodiments, the inner surface of the housing 110 is coated with a first coating 131, and the outer surface of the battery cell 120 is coated with a second coating 132 that is offset from the first coating 131. The second coating 132 and the first coating 131 are joined together and cured by high temperature to form a hard coating 130.

[0042] In this embodiment, the first coating 131 is applied to the inner surface of the outer casing 110. Its material possesses good high-temperature melt flowability and high adhesion to the inner surface of the outer casing 110. Furthermore, its hardness after melting and solidification must be greater than that of the outer casing 110 and the battery cell 120. The second coating 132 is applied to the outer surface of the battery cell 120. Its material must have good melt compatibility with the first coating 131, meaning that the two can achieve uniform fusion under the same high-temperature conditions, and the overall hardness after melting and solidification must meet the standard. The same material as the first coating 131 can be selected.

[0043] The coating area of ​​the second coating 132 is offset from the coating area of ​​the first coating 131. Specifically, if the first coating 131 covers the edge area of ​​the inner surface of the outer casing 110, then the second coating 132 covers the middle area of ​​the outer surface of the battery cell 120. This offset arrangement ensures that the first coating 131 and the second coating 132 can be completely fitted together after the battery cell 120 is installed in the outer casing 110, without any gaps in coverage. The coating thickness of the second coating 132 is consistent with or differs from that of the first coating 131 by no more than a preset value (e.g., 2 μm). For example, if the thickness of the first coating 131 is 30 μm, the thickness of the second coating 132 can be 28 μm to 32 μm.

[0044] Specifically, the battery cell 120 coated with the second coating 132 is inserted into the outer casing 110 coated with the first coating 131, so that the first coating 131 and the second coating 132 are completely spliced ​​together according to a preset staggered layout to form a continuous hard coating layer. Subsequently, in the formation process, the assembled outer casing 110 and the battery cell 120 are placed in a high-temperature curing oven and heated according to a preset temperature curve. The heating temperature needs to be set according to the material characteristics of the first coating 131 and the second coating 132, and the temperature is held for a preset time to ensure that the first coating 131 and the second coating 132 are fully melted and mutually penetrated and fused. After the heating is completed, it is cooled to room temperature at a slow cooling rate to solidify and form a complete hard coating 130 without splicing gaps, which is connected between the outer surface of the battery cell 120 and the inner surface of the outer casing 110. The overall hardness of the hard coating 130 still meets the requirement that it is greater than the hardness of the battery cell 120 and the hardness of the outer casing 110, respectively.

[0045] During the high-temperature curing process, the first coating 131 and the second coating 132 melt and permeate each other, breaking the interface boundary between them to form a homogeneous hard coating 130 as a whole. Compared with traditional split hard coatings, this integrated structure eliminates stress concentration points that may be generated by splicing gaps, making the stiffness and strength distribution of the hard coating 130 more uniform and more efficient in dispersing external forces during the production stage and internal stress during cyclic testing. The cured hard coating 130 achieves a dual connection of "chemical bonding + physical adhesion" with the inner surface of the outer shell 110 and the outer surface of the battery cell 120 through fusion, and the adhesion is significantly higher than that of traditional coating or bonding methods. This tight connection allows the hard coating 130 to more accurately constrain the deformation trend of the battery cell 120. When the battery cell 120 tends to deform due to external forces or internal stress, the hard coating 130 can transmit the stress evenly to the outer shell 110 through overall force transmission, avoiding excessive local deformation of the battery cell 120.

[0046] The structural forms of the first coating 131 and the second coating 132 can be:

[0047] In some embodiments, refer to Figure 2 and Figure 3 One of the first coating 131 and the second coating 132 is arranged in a grid pattern, while the other is arranged in an array pattern. The complementary structure of the grid pattern and the array pattern enhances the stress dispersion capability and adaptability of the hard coating 130.

[0048] Specifically, the first coating 131 (applied to the inner surface of the outer casing 110) can be arranged in a grid pattern, and the second coating 132 can be arranged in an array pattern, which will be used as an example for illustration. The first coating 131 is grid-shaped, and the grid units can be squares, regular hexagons, or rhombuses, etc. The grid structure needs to cover the pre-defined coating area on the inner surface of the outer casing 110, and the grid lines need to be continuous without breaks to ensure the overall structural integrity of the hard coating. The grid lines are evenly distributed to form a regular grid framework. The second coating 132 (applied to the outer surface of the cell 120) is array-shaped, and the array units can be squares, regular hexagons, or rhombuses, etc. The size of the array units is complementary to the size of the grid units of the grid-shaped hard coating to ensure that the array units can be embedded in the gaps between the grid units, achieving the splicing effect of the grid framework and the array filling. The arrangement density of the array units needs to match the distribution density of the grid units to ensure that there are no gaps after the two are spliced ​​together, and that there is no overlap between the array units.

[0049] Conversely, if the first coating 131 is array-shaped and the second coating 132 is grid-shaped, its structural design, material selection and process requirements are the same as those mentioned above. Only the position and size of the grid and array need to be adjusted according to the coating area of ​​the inner surface of the outer shell 110 and the outer surface of the battery cell 120 to ensure complementary splicing.

[0050] In addition to the above-mentioned scheme, the structural forms of the first coating 131 and the second coating 132 can also be:

[0051] In some embodiments, the first coating 131 includes a plurality of first sub-coatings arranged in strips, and the second coating 132 includes a plurality of second sub-coatings arranged in strips;

[0052] Along the width or height direction of the outer casing 110, multiple first sub-coatings and multiple second sub-coatings are alternately combined.

[0053] Multiple first sub-coatings are distributed parallel to each other along the width or height direction of the outer casing 110. The gap width between two adjacent first sub-coatings is equal to the width of a single second sub-coating, ensuring precise alternating splicing with the second sub-coatings in subsequent applications. Multiple second sub-coatings are distributed parallel to each other along the width or height direction of the cell 120, with the distribution direction consistent with that of the first sub-coatings. The gap width between two adjacent second sub-coatings is equal to the width of a single first sub-coating, forming an alternating layout of "first sub-coating-second sub-coating-first sub-coating".

[0054] Specifically, the battery cell 120 coated with multiple strip-shaped second sub-coatings is inserted into the housing 110 coated with multiple strip-shaped first sub-coatings, so that a single second sub-coating is precisely embedded in the gap between two adjacent first sub-coatings, and a single first sub-coating is simultaneously embedded in the gap between two adjacent second sub-coatings, thus forming a continuous hard coating with no gaps and no overlap.

[0055] In some embodiments, the housing 110 includes an aluminum-plastic film with an inner recess, the surface of which is coated with a hard coating 130. In this embodiment, the housing 110 specifically uses an aluminum-plastic film with an inner recess, which provides a space for the battery cell 120 and adapts to the external dimensions of the thin battery cell. The battery cell 120 is assembled in the inner recess of the aluminum-plastic film, and the hard coating 130 is attached to the outer surface of the battery cell 120 and the surface of the inner recess to form a tight fit, ultimately constituting a complete pouch battery structure.

[0056] In some embodiments, the thickness of the hard coating 130 is 20 μm to 40 μm. Exemplarily, the thickness of the hard coating 130 can be 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, 31 μm, 32 μm, 33 μm, 34 μm, 35 μm, 36 μm, 37 μm, 38 μm, 39 μm, or 40 μm, or within the range of any two of the above values. By setting the thickness of the hard coating 130 within the range of 20 μm to 40 μm, the impact on the thickness of the battery cell 120 is reduced while ensuring the supporting performance of the hard coating.

[0057] In some embodiments, refer to Figure 2 The outer surface of the battery cell 120 includes a first flat region P1 and a second flat region P2 disposed opposite to each other along its thickness direction;

[0058] At least one of the first flat region P1 and the second flat region P2 is coated with a hard coating 130.

[0059] Two flat areas are arranged opposite each other on the outer surface of the battery cell 120 along its thickness direction, namely the first flat area P1 (the side closer to the outer shell 110) and the second flat area P2 (the side away from the outer shell 110). Both areas are flat areas on the outer surface of the battery cell 120, which are the main places where bulges or concavities occur during the deformation of the pot lid.

[0060] The hard coating 130 can be attached in a single-area manner: the hard coating 130 is attached only to the first flat area P1 or the second flat area P2. Alternatively, it can be attached in a dual-area manner: the hard coating 130 is attached to both the first flat area P1 and the second flat area P2, and the two hard coatings can be formed independently. The hard coating 130 is precisely attached to the easily deformable flat area. When the battery cell 120 is subjected to external force or releases internal stress, the hard coating 130 acts directly on the deformation source area, preventing the flat area of ​​the battery cell 120 from bulging or concave, and avoiding the stress from spreading to other areas.

[0061] In some embodiments, refer to Figure 2 The outer surface of the battery cell 120 also includes a first corner region G1 and a second corner region G2 that are disposed opposite to each other along its width direction;

[0062] At least one of the first corner area G1 and the second corner area G2 is coated with a hard coating 130.

[0063] Two corner areas are arranged opposite each other on the outer surface of the battery cell 120 along its width direction. These are the first corner area G1 (on one side of the width direction, the edge area connecting the first straight area P1 and the second straight area P2) and the second corner area G2 (on the other side of the width direction of the battery cell 120, the structure is symmetrical with the first corner area G1). The two areas have an arc-shaped transition structure.

[0064] The hard coating 130 can be applied at a single corner: the hard coating 130 is applied only to the first corner area G1 or the second corner area G2. The hard coating adapts to the arc-shaped structure of the corner area and can be seamlessly connected with the hard coating 130 of the adjacent straight area (if the straight area already has a hard coating) or formed independently. Alternatively, it can be applied at two corners: the hard coating 130 is applied to both the first corner area G1 and the second corner area G2. The two hard coatings are symmetrically arranged and form an all-round protection system through corner support and straight area constraint.

[0065] In some embodiments, the battery cell 120 includes a first electrode, a separator, and a second electrode that are stacked and wound together with each other;

[0066] The first electrode includes a current collector and an active material layer. The current collector has a coating area and an empty foil area distributed along its length. The active material layer is coated on the coating area, and the empty foil area is exposed on the outermost ring of the cell 120. The hard coating 130 is attached to the empty foil area.

[0067] The battery cell 120 is a wound battery cell, formed by stacking and winding a first electrode, a separator, and a second electrode. The first electrode contains a current collector (such as copper or aluminum foil) and an active material layer. The current collector is divided into a coated area (covered by the active material layer) and an empty foil area (without the active material layer) along its length. The empty foil area is exposed on the outermost ring of the battery cell 120 after winding. Specifically, the empty foil area can be part or all of the outermost ring of the battery cell 120. The hard coating 130 is directly attached to the surface of the empty foil area; that is, the hard coating 130 utilizes the existing space of the empty foil area, eliminating the need for a large coating gap between the battery cell 120 and the casing 110.

[0068] This utility model embodiment also proposes an electronic device, which includes a soft-pack battery 100 as described in the foregoing embodiments. The specific structure of the soft-pack battery 100 is as described in the above embodiments. Since this electronic device adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0069] The electronic device described in this application is not particularly limited and can be any electronic device known in the prior art. The electrochemical device described in this application is also not particularly limited in its use and can be used in any electronic device known in the prior art. According to some embodiments of this application, the electronic devices include, but are not limited to, mobile phones, smartphones, laptops, tablets, wearable devices, smartwatches, smart bracelets, smart glasses, power banks, televisions, game consoles, game controllers, digital cameras, smart speakers, headphones, keyboards, mice, monitors, drones, audio equipment, home appliances, toys, power tools, automobiles, motorcycles, electric bicycles, bicycles, robots, robot dogs, industrial robots, and androids.

[0070] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A pouch battery, comprising a casing and a battery cell, wherein the battery cell is disposed within the casing, characterized in that, A hard coating with a hardness greater than that of the battery cell and the outer surface of the casing is formed between the outer surface of the battery cell and the inner surface of the casing. One side of the hard coating is attached to the inner surface of the casing, and the other side is attached to the outer surface of the battery cell.

2. The soft-pack battery according to claim 1, characterized in that, The inner surface of the outer casing is coated with a first coating, and the outer surface of the battery cell is coated with a second coating that is offset from the first coating. The second coating and the first coating are combined and melted and cured to form the hard coating.

3. The soft-pack battery according to claim 2, characterized in that, One of the first coating and the second coating is arranged in a grid pattern, and the other is arranged in an array pattern.

4. The soft-pack battery according to claim 2, characterized in that, The first coating includes a plurality of first sub-coatings arranged in strips, and the second coating includes a plurality of second sub-coatings arranged in strips; Along the width or height direction of the outer shell, the plurality of first sub-coatings and the plurality of second sub-coatings are alternately combined.

5. The soft-pack battery according to claim 1, characterized in that, The outer casing includes an aluminum-plastic film with an inner cavity, the surface of which is coated with the hard coating.

6. The soft-pack battery according to claim 1, characterized in that, The thickness of the hard coating is 20μm to 40μm.

7. The pouch cell battery according to any one of claims 1 to 6, characterized in that, The outer surface of the battery cell includes a first flat region and a second flat region that are disposed opposite to each other along its thickness direction; At least one of the first flat region and the second flat region is coated with the hard coating.

8. The soft-pack battery according to claim 7, characterized in that, The outer surface of the battery cell also includes a first corner area and a second corner area that are disposed opposite to each other along its width direction; At least one of the first corner area and the second corner area is covered with the hard coating.

9. The pouch cell battery according to any one of claims 1 to 6, characterized in that, The battery cell includes a first electrode, a diaphragm, and a second electrode that are stacked and wound together. The first electrode includes a current collector and an active material layer. The current collector has a coating area and an empty foil area distributed along its length. The active material layer is coated on the coating area. The empty foil area is exposed on the outermost ring of the battery cell. The hard coating layer is attached to the empty foil area.

10. An electronic device, characterized in that, Includes the pouch cell as described in any one of claims 1 to 9.

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