Pouch lithium ion battery and electronic product

Abstract

The utility model relates to the field of lithium ion battery preparation discloses a kind of soft package lithium ion battery and electronic product.Battery includes aluminium plastic film shell, electrolyte and electrode assembly, the electrode assembly includes an electrode assembly and the ceramic diaphragm layer of coating in the outside of electrode assembly, the inner surface of the ceramic diaphragm layer polyolefin base film and the electrode assembly are pasted, the outer surface ceramic layer is opposite with the inner surface of aluminium plastic film shell, the electrode assembly includes positive plate, negative plate and diaphragm layer between each adjacent positive plate and negative plate, the positive plate, negative plate respectively connect with positive lug, negative lug, the positive lug, negative lug protrude from the ceramic diaphragm layer, the electrode assembly, electrolyte are sealed in the aluminium plastic film shell, the positive lug, negative lug respectively from the sealing edge of aluminium plastic film shell protrude.

Description

Technical Field

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

[0002] Thin-pack lithium-ion batteries are widely used in wearable devices and flexible electronic products (such as smart rings) due to their advantages such as lightweight and flexibility. The market demand for irregularly shaped batteries, especially curved batteries, is increasingly urgent. These batteries are typically extremely thin (1.0mm to 3.0mm thick) with a very compact internal space. During the research of this invention, the inventors discovered that existing ultra-thin lithium-ion batteries suffer from high internal corrosion rates and low packaging reliability. Summary of the Invention

[0003] One of the objectives of this utility model is to provide a soft-pack lithium-ion battery and electronic product that can effectively isolate encapsulated thermal radiation, prevent mechanical damage, and significantly improve production yield and long-term reliability.

[0004] In a first aspect, this embodiment provides a soft-pack lithium-ion battery, comprising: an aluminum-plastic film casing, an electrolyte, and an electrode assembly, characterized in that... The electrode assembly includes an electrode assembly and a ceramic membrane layer covering the outside of the electrode assembly. The polyolefin-based film on the inner surface of the ceramic membrane layer is attached to the electrode assembly, and the ceramic layer on the outer surface is opposite to the inner surface of the aluminum-plastic film shell. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator layer spaced between adjacent positive and negative electrode plates. Positive and negative tabs are respectively connected to the positive and negative electrode plates, and these tabs extend beyond the ceramic separator layer. The electrode assembly and electrolyte are sealed inside the aluminum-plastic film shell, and the positive and negative tabs extend from the sealing edge of the aluminum-plastic film shell.

[0005] Optionally, the outer peripheral edges of the two ceramic diaphragm layers covering the top and bottom surfaces of the electrode assembly are connected to form a ceramic diaphragm bag, the electrode assembly is encapsulated in the ceramic diaphragm bag, and the positive and negative tabs extend out of the ceramic diaphragm bag.

[0006] Optionally, the electrode assembly is a stacked battery cell formed by stacking the positive and negative electrode sheets, with each separator layer spaced between adjacent positive and negative electrode sheets. The positive electrode tabs located at the wide end of each positive electrode sheet extend beyond the ceramic separator layer and are stacked and welded together, and are welded to the positive electrode tabs located outside the ceramic separator layer; The negative electrode tabs located at the wide end of each negative electrode sheet extend beyond the ceramic diaphragm layer and are stacked and welded together, and are welded to the negative electrode tabs located outside the ceramic diaphragm layer.

[0007] Optionally, the two outermost electrodes of the laminated battery cell are both coated with active material on one side, and the side without active material coating is in contact with the ceramic separator layer directly opposite it. The electrode can be either the positive electrode or the negative electrode.

[0008] Optionally, each of the electrodes in the laminated battery cell is arc-shaped, and the electrode assembly formed by the laminated battery cell and the ceramic separator layer is arc-shaped.

[0009] Optionally, the electrode assembly is formed by winding the stacked positive electrode, separator, and negative electrode, with the separator spaced between the positive electrode and the negative electrode.

[0010] Optionally, the electrode assembly is hot-pressed into an arc shape, and under the action of heat and pressure, the polyolefin-based film on the inner surface of the ceramic diaphragm layer is thermally fused to the outside of the stacked battery cell.

[0011] Optionally, the thickness of the battery is 1.0mm to 3.0mm; The thickness of the ceramic diaphragm layer is 7μm ~ 20μm; The electrolyte is a liquid electrolyte that fills the electrode assembly, or the electrolyte is a solid electrolyte that is disposed between the positive electrode and the negative electrode.

[0012] Optionally, the inner edge of the heat-sealed edge of the aluminum-plastic film shell is 0.1mm to 0.5mm away from the outer edge of the electrode assembly.

[0013] Secondly, this utility model provides an electronic product including any of the soft-pack lithium-ion batteries described above.

[0014] As can be seen from the above, by adopting the technical solution of this embodiment, this utility model can effectively protect the electrodes inside the separator by coating the electrode assembly with a ceramic membrane layer, preventing electrode damage and powder shedding, reducing the risk of low pressure and internal corrosion, and effectively solving the two major problems of thermal radiation burns and mechanical damage during the process; at the cost of a small energy density (about 1%), it achieves an exponential improvement in production yield and product reliability, with huge comprehensive benefits, and provides a brand-new idea for ultra-thin battery design. Attached Figure Description

[0015] The accompanying drawings, which are provided to further illustrate the present invention and form part of this application, do not constitute an undue limitation of the present invention.

[0016] Figure 1 This is an exploded structural diagram of the ceramic diaphragm bag and the stacked battery cell provided in an embodiment of the present invention; Figure 2 A schematic diagram of the structure of an electrode assembly formed by mounting a laminated battery cell inside a ceramic diaphragm bag, provided in an embodiment of this utility model; Figure 3 A schematic diagram of the structure of the arc-shaped electrode assembly provided in an embodiment of this utility model; Figure 4 A schematic diagram of the external structure of the arc-shaped soft-pack lithium-ion battery provided in this embodiment of the utility model.

[0017] 1: Electrode assembly; 11: Positive electrode welding section; 12: Negative electrode welding section; 13: Positive tab; 14: Negative tab; 2: Aluminum-plastic film outer shell; 3: Ceramic diaphragm layer; 4: Electrode assembly; 5: Tab adhesive 6: Front edge sealing; 7: Side edge sealing. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0019] See Figures 1-4 As shown.

[0020] This embodiment provides a structure for a pouch lithium-ion battery, which is particularly suitable for the design of ultra-thin pouch lithium-ion batteries with a thickness of ≤3mm, for example, but not limited to, a battery thickness of 1.3~1.6mm.

[0021] The ultra-thin soft-pack lithium-ion battery mainly includes: electrode assembly 1 (commonly known as a cell, not shown in the figure) and an aluminum-plastic film shell 2 that seals the electrode assembly 1.

[0022] The electrode assembly 1 consists of a positive electrode, a negative electrode, a separator, and an electrolyte. External tabs are welded onto the positive and negative electrode sheets to serve as external electrodes.

[0023] A separator is provided between each positive and negative electrode. The positive electrode includes an aluminum foil current collector and positive polar active material layers coated on both sides of the aluminum foil current collector. The positive polar active material may be, but is not limited to, lithium iron phosphate, ternary materials, etc. The negative electrode includes a copper foil current collector and negative polar active material layers coated on both sides of the copper foil current collector. The negative polar active material may be, but is not limited to, graphite, silicon carbide, etc.

[0024] Referring to the illustration, this embodiment uses an ultra-thin arc-shaped lithium-ion battery as an example. Specifically, the bottom and top surfaces of the electrode assembly 1 are parallel arc surfaces. The electrode assembly 1 can be manufactured using a winding process or a stacking process.

[0025] Taking the lamination process as an example, a laminated battery cell consists of sheet-like positive electrode plates, separator layers, and negative electrode plates stacked together. After lamination, the middle of the laminated battery cell along its length is initially fixed to prevent it from spreading out. In its natural state, the laminated battery cell is placed in a support mold of different shapes. Under the action of gravity, each electrode plate and separator layer of the laminated battery cell adheres tightly to the top surface of the support mold, and the laminated battery cell takes on the same shape as the support mold. Each electrode plate within this arc-shaped laminated battery cell remains in its natural state without deformation.

[0026] For example, when the top surface of the support mold is a convex arc shape along its length, the two wide ends of the laminated battery cell placed on it naturally droop under gravity. The laminated battery cell on the support mold naturally forms an arc shape along its length, with a convex center and drooping ends. The inner arc of the laminated battery cell's side is in close contact with the support mold, and the outer arc is located on the top surface of the arc-shaped battery. When the support mold is a concave arc shape along its length, the laminated battery cell on it forms an arc shape with only a concave center and rising ends. The outer arc of the laminated battery cell's side is in close contact with the support mold, and the inner arc is located on the top surface of the arc-shaped battery. The laminated battery cell is shaped into an arc shape through hot pressing, and then fixed into an arc shape after pressure holding and cooling.

[0027] After the positive electrode welding part 11 (negative electrode welding part 12) of each positive (negative) electrode sheet in the laminated cell is stacked and welded together, the positive (negative) electrode tabs are welded to the outside. The positive electrode tab 13 and negative electrode tab 14 of the laminated cell extend out of the laminated body.

[0028] When the electrode assembly 1 is a wound battery cell made by a winding process, the wound battery cell can be placed on a preset arc mold after the winding process, and the wound battery cell can be hot-pressed and wound at a certain temperature and time. After holding the pressure and cooling, it is formed into an arc shape.

[0029] After obtaining the electrode assembly 1, a ceramic diaphragm layer 3 is wrapped around the outside of the electrode assembly 1. The stacked positive electrode welding part 11 and the stacked negative electrode welding part 12 extend out of the ceramic diaphragm layer 3 to weld the positive electrode tab 13 and the negative electrode tab 14 respectively. As an illustration of this embodiment, after covering the ceramic diaphragm layer 3, the two ceramic diaphragm layers 3 covering the bottom and top surfaces of the electrode assembly 1 can be heat-sealed, laser-spot-welded, glued, or ultrasonically welded to form a ceramic diaphragm bag containing the electrode assembly 1, with the positive electrode tab 13 and the negative electrode tab 14 extending out from the ceramic diaphragm bag.

[0030] The ceramic membrane layer 3 is a composite membrane made by coating a layer of inorganic ceramic particles (such as alumina Al2O3, silicon dioxide SiO2, etc.) onto the side of a traditional polyolefin-based membrane (such as polyethylene (PE) or polypropylene (PP)) facing the aluminum-plastic film shell 2.

[0031] As an illustration of this embodiment, the arc-shaped electrode assembly 1 can be formed by hot pressing before covering the ceramic diaphragm layer 3 (which may or may not be limited to forming a ceramic diaphragm bag). Alternatively, after covering the ceramic diaphragm layer 3 (which may or may not be limited to forming a ceramic diaphragm bag), the electrode assembly 44 covered with the ceramic diaphragm layer 3 can be placed on a support platform with an arc-shaped support surface, hot-pressed, and cooled under pressure to form the arc-shaped electrode assembly 44. The ceramic diaphragm layer 3 is tightly attached to the surface of the electrode assembly 1, making the structure of the electrode assembly 4 more compact.

[0032] As an illustration of this embodiment, the ceramic membrane layer 3 is a flexible composite film, comprising a base film made of polyolefin material (such as PE or PP film) and a ceramic coating (such as an alumina coating) coated on at least one surface of the base film. This material combines the flexibility and heat-sealing properties of the base film with the high temperature resistance and high mechanical strength of the ceramic coating, and its total thickness is 7μm to 20μm.

[0033] A recess matching the arc shape of the electrode assembly 1 is pre-stamped into the aluminum-plastic film. The inner surface of the bottom of the recess is an arc shape along its length. This recess serves as a support mold for the electrode assembly 1, and the shape of the inner surface of the bottom of the recess determines the shape of the electrode assembly 1 placed within the recess. In this embodiment, the two long edges of the recess opening are arc shapes parallel to its bottom surface, and the two wide edges of the recess opening can, but are not limited to, be straight lines. An integral aluminum-plastic film extends from all four sides of the recess opening in the aluminum-plastic film, and aluminum-plastic film is pre-reserved for heat sealing at the two wide edges and the long edges of the recess opening. The recess is used as a cavity 11 for accommodating the arc-shaped electrode assembly 1. After the electrode assembly 1 is placed into the recess, the bottom aluminum-plastic film is folded along a width end or a length end of the recess to become the top aluminum-plastic film of the aluminum-plastic film shell 2. The top aluminum-plastic film completely covers the top of the opening of the recess and is in contact with the bottom aluminum-plastic film. At this time, the polypropylene layer surfaces of the two aluminum-plastic films are facing each other, serving as the inner surface of the aluminum-plastic film shell 2.

[0034] For the heat-sealed edge (referred to as the positive sealing edge 6) of the aluminum-plastic film shell 2 with electrode leads, electrode adhesive 5 is applied to the front and back sides of the electrode section located between the heat-sealed edges of the two electrode tabs of the electrode assembly 1 body. The electrode adhesive 5 pre-covers the welding section before entering the aluminum-plastic film shell 2 to prevent welding burrs from piercing the aluminum-plastic film and affecting the sealing reliability of the aluminum-plastic film shell 2. During heat sealing, a heat sealing machine is used to apply a certain amount of heat and pressure to the positive sealing edge 6 to be heat-sealed. On the positive sealing edge 6, the polypropylene layers on the inner surfaces of the upper and lower layers of aluminum-plastic film melt and bond together under pressure and heat, and are sealed together after cooling and solidification. At the same time, the electrode adhesive 5 on the front and back sides of the electrode tab melts and flows with the adhesive layer on the opposite surfaces of the lower and upper layers to fill the micro gaps between the aluminum-plastic film and the electrode section on the top and bottom surfaces. The electrode adhesive 5 melts and fully bonds together with the aluminum-plastic film on the bottom and top surfaces. After holding pressure and cooling, the middle section of the electrode tab is sealed together in the heat-sealed edge at this end.

[0035] For the heat-sealed edge (referred to as side sealing edge 7) of the aluminum-plastic film shell 2 without electrode leads, a heat sealing machine is used to apply a certain pressure and heat to the side sealing edge 7 to be heat-sealed. This causes the polypropylene layers on the opposing inner surfaces of the upper and lower layers of the aluminum-plastic film to melt and bond together under pressure and heat. After pressure holding, cooling, and solidification, the layers are sealed together to form a heat-sealed edge. The heat sealing conditions are 180℃ / 3MPa / 10s.

[0036] In their research on this invention, the inventors discovered that traditional processes face fundamental challenges when the battery thickness is ≤3mm: To ensure sealing, the heat-sealing blade must be extremely close to the electrode assembly 1 during heat sealing of the aluminum-plastic film (typically only 0.1mm~0.5mm). This results in high heat radiation that easily burns the internal separator and electrodes, leading to serious reliability issues such as increased internal resistance, internal corrosion, and even short circuits. Simultaneously, the ultra-thin electrode assembly 1 is highly susceptible to electrode damage and powder shedding during manufacturing due to mechanical stress, increasing the risk of low voltage and self-discharge. While existing technologies address battery safety and energy density, they primarily focus on optimizing the sealing edge layout, failing to fundamentally solve the industry problems caused by heat radiation during packaging and mechanical damage during manufacturing. There is a widespread industry bias that "no non-active materials can be added inside the battery," which is considered an unacceptable sacrifice in energy density.

[0037] By adopting the technical solution of this embodiment, this utility model can effectively protect the electrode sheets inside the separator by coating the electrode assembly 1 with a ceramic membrane layer 3, preventing the electrode sheets from being damaged and causing powder shedding, reducing the risk of low pressure and internal corrosion, and effectively solving the two major problems of heat radiation burns and mechanical damage during the process; at the cost of a small amount of energy density (about 1%), it achieves an exponential improvement in production yield and product reliability, with huge comprehensive benefits, and provides a brand-new idea for ultra-thin battery design.

[0038] The manufacturing process of the soft-pack lithium-ion battery in this embodiment is as follows: An electrode assembly 1 consisting of a positive electrode, a negative electrode, and a separator layer is provided, and the manufacturing process can be found in the prior art.

[0039] A ceramic diaphragm layer 3 is wrapped around the outside of the electrode assembly 1. The positive electrode tab 13 and the negative electrode tab 14 of the electrode assembly 1 extend beyond the ceramic diaphragm layer 3. For example, but not limited to, after wrapping, the outer edge of the ceramic diaphragm layer 3 is further heat-sealed to form a ceramic diaphragm bag containing the electrode assembly 1. Further hot pressing can be performed to make the ceramic diaphragm layer 3 adhere tightly to the outer periphery of the electrode assembly 1, improving the structural compactness of the electrode assembly 4.

[0040] The coated electrode assembly 4 is placed into a pre-formed aluminum-plastic film shell 2 and then encapsulated with the aluminum-plastic film.

[0041] Example 1: Coating followed by hot pressing process.

[0042] Electrode assembly 1 is fabricated using a lamination process, where multiple positive electrode sheets, negative electrode sheets, and separator layers are stacked to form a rectangular laminated battery cell. Positive electrode welding portion 11 and negative electrode welding portion 12 are located at opposite ends of the laminated battery cell, respectively, to weld positive electrode tabs 13 and negative electrode tabs 14. The outermost positive and negative electrode sheets are coated on one side only, with the uncoated side facing outwards. The electrode tabs are then welded.

[0043] Ceramic separator layer 3 coating: A ceramic separator layer 3 of suitable size and thickness of 7μm is used to coat the outside of the stacked battery cell, with the polyolefin base film of the ceramic separator layer 3 facing inward and adhering to the stacked battery cell, and the ceramic coating of the ceramic separator layer 3 facing outward and coating the outer periphery of the stacked battery cell, so as to be opposite to the aluminum-plastic film shell 2.

[0044] The upper and lower ceramic diaphragm layers 3 on both sides of the ceramic diaphragm layer 3 are connected together by a heat sealing process to form a ceramic diaphragm bag with openings at both ends. The electrode tabs of the laminated battery cells extend out from the openings at both ends of the ceramic diaphragm bag.

[0045] Hot pressing and shaping: The coated electrode assembly 4 is placed in an arc-shaped mold, so that each electrode sheet in the stacked cell forms an arc shape consistent with the arc shape of the mold under the action of gravity. Hot pressing is performed at a certain temperature and time to form the electrode assembly 4 into a stable arc shape.

[0046] Encapsulation: The arc-shaped electrode assembly 4 is placed into the pre-stamped arc-shaped aluminum-plastic film shell 2, electrolyte is injected, and after vacuuming and settling, the aluminum-plastic film shell 2 is finally encapsulated.

[0047] When heat-sealing the aluminum-plastic film shell 2, the temperature of the heat-sealing knife is 180~200°C, and the inner edge of the heat-sealing knife is 0.2mm away from the outer edge of the electrode assembly 4.

[0048] Example 2: Hot-pressing followed by coating process Preparation and hot pressing of electrode assembly 1: After preparing the stacked cell in step 1 of Example 1, it is first placed in an arc-shaped mold for hot pressing, so that electrode assembly 1 is directly formed into an arc shape.

[0049] Ceramic separator layer 3 coating: The pre-shaped arc-shaped laminated battery cell is coated with a flexible ceramic separator layer 3 and heat-sealed to form a separator bag.

[0050] Encasing: Same as in Example 1.

[0051] Example 3: Winding cell process.

[0052] Preparation of electrode assembly 1: Using a winding process, the positive electrode sheet, separator, and negative electrode sheet are stacked and wound into an elliptical core, and then the tabs are welded.

[0053] Ceramic diaphragm layer 3 encapsulation: A flexible ceramic diaphragm layer 3 of suitable size and thickness of 7μm is used to wrap the wound body, and the four sides are sealed by heat sealing process to form a ceramic diaphragm bag with one end open. The wound body is encapsulated in the ceramic diaphragm bag, and the positive and negative tabs 14 extend out of the bag. The ceramic coating on the ceramic diaphragm layer 3 serves as the inner surface of the ceramic diaphragm bag and is attached to the wound body. The ceramic coating on the ceramic diaphragm layer 3 serves as the outer surface of the ceramic diaphragm bag and is opposite to the aluminum-plastic film shell 2. The ceramic diaphragm layer 3 used is the same as in Example 1.

[0054] Hot pressing: According to the shape requirements of the shell, the wrapped wound electrode assembly 4 can be placed into the arc mold for hot pressing to better fit the arc shell.

[0055] Encapsulation: The electrode assembly 4 is placed into the pre-stamped aluminum-plastic film shell 2, electrolyte is injected, and after vacuuming and settling, the aluminum-plastic film shell 2 is finally encapsulated. See Example 1 for the heat sealing process.

[0056] Comparative example: 1000 batteries of the same specifications were produced using a traditional process (without a ceramic separator coating layer, the wound cells are directly encapsulated in aluminum-plastic film). The heat-sealing process was the same as in Example 1.

[0057] 1000 batteries were randomly selected from each of the experimental and comparative examples, and the following experimental data were obtained.

[0058] Further experimental data are shown below: Heat sealing burn failure rate 12.5% 0.5% 0.3% 0.6% -96% Process powder shedding and low pressure defect rate 8.1% 1.5% 1.0% 1.3% -85% 300-cycle capacity retention 81.5% 89.5% 90.1% 89.0% +8.5% Full-charge thermal shock (130°C) pass rate 70% 100% 100% 100% Significant improvement

[0059] As can be seen from the above, regardless of the specific process path in Examples 1, 2, and 3, the solution of this utility model can reduce the core defect rate (heat sealing burns, mechanical powder shedding) in the production process by more than 85%, while increasing the long-term cycle life of the battery by more than 8 percentage points. This improvement has great positive significance in industrial production.

[0060] Furthermore, embodiments one, two, and three of this utility model all exhibit highly consistent good results, which proves that the excellent results do not depend on a specific cell structure (stacked or wound) or process sequence. The "ceramic diaphragm coating layer" is the core key technology of this utility model, and its effect is universal and repeatable.

[0061] It should be noted that the pass rate of the thermal shock test has been increased from 70% to 100%, which shows that the present invention has fundamentally improved battery safety and solved a long-standing pain point in the industry.

[0062] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

[0063] Examples of embodiments of the present invention are shown in the accompanying drawings in a detailed description below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0064] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention.

[0065] Furthermore, the terms "" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A soft-pack lithium-ion battery, comprising: An aluminum-plastic film casing, electrolyte, and electrode assembly, characterized in that, The electrode assembly includes an electrode assembly and a ceramic membrane layer covering the outside of the electrode assembly. The polyolefin-based film on the inner surface of the ceramic membrane layer is attached to the electrode assembly, and the ceramic layer on the outer surface is opposite to the inner surface of the aluminum-plastic film shell. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator layer spaced between adjacent positive and negative electrode plates. Positive and negative tabs are respectively connected to the positive and negative electrode plates, and these tabs extend beyond the ceramic separator layer. The electrode assembly and electrolyte are sealed inside the aluminum-plastic film shell, and the positive and negative tabs extend from the sealing edge of the aluminum-plastic film shell.

2. The soft-pack lithium-ion battery according to claim 1, characterized in that, The outer peripheral edges of the two ceramic diaphragm layers covering the top and bottom surfaces of the electrode assembly are connected to form a ceramic diaphragm bag. The electrode assembly is encapsulated in the ceramic diaphragm bag, and the positive and negative tabs extend out of the ceramic diaphragm bag.

3. The soft-pack lithium-ion battery according to claim 1, characterized in that, The electrode assembly is a stacked battery cell formed by stacking the positive and negative electrode sheets, with each separator layer spaced between adjacent positive and negative electrode sheets. The positive electrode tabs located at the wide end of each positive electrode sheet extend beyond the ceramic separator layer and are stacked and welded together, and are welded to the positive electrode tabs located outside the ceramic separator layer; The negative electrode tabs located at the wide end of each negative electrode sheet extend beyond the ceramic diaphragm layer and are stacked and welded together, and are welded to the negative electrode tabs located outside the ceramic diaphragm layer.

4. The soft-pack lithium-ion battery according to claim 3, characterized in that, The outermost two electrodes of the laminated battery cell are both coated with active material on one side, and the side without active material coating is in contact with the ceramic separator layer directly opposite it. The electrode can be either the positive electrode or the negative electrode.

5. The soft-pack lithium-ion battery according to claim 4, characterized in that, Each electrode in the laminated battery cell is arc-shaped, and the electrode assembly formed by the laminated battery cell and the ceramic separator layer is arc-shaped.

6. The soft-pack lithium-ion battery according to claim 1, characterized in that, The electrode assembly is formed by winding the stacked positive electrode, separator, and negative electrode, with the separator spaced between the positive and negative electrode.

7. The soft-pack lithium-ion battery according to claim 5, characterized in that, The electrode assembly is hot-pressed into an arc shape, and under the action of heat and pressure, the polyolefin-based film on the inner surface of the ceramic diaphragm layer is thermally fused to the outside of the stacked battery cell.

8. The soft-pack lithium-ion battery according to claim 1, characterized in that, The thickness of the battery is 1.0mm to 3.0mm; The thickness of the ceramic diaphragm layer is 7μm ~ 20μm; The electrolyte is a liquid electrolyte that fills the electrode assembly, or the electrolyte is a solid electrolyte that is disposed between the positive electrode and the negative electrode.

9. The soft-pack lithium-ion battery according to claim 1, characterized in that, The inner edge of the heat-sealed edge of the aluminum-plastic film shell is 0.1mm to 0.5mm away from the outer edge of the electrode assembly.

10. An electronic product characterized by, Includes the soft-pack lithium-ion battery as described in any one of claims 1 to 9.

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