A laminated cell and a battery

Abstract

The application relates to the technical field of batteries, and discloses a laminated cell and a battery. The laminated cell comprises a main body structure and a support pipe. The main body structure is provided with a clearance hole penetrating through the main body structure along the thickness direction of the main body structure. The support pipe is arranged in the clearance hole, and the central axis of the support pipe penetrates through the clearance hole to form a through hole for the flow of electrolyte. The side wall of the through hole can adsorb electrolyte. The laminated cell can effectively improve the wetting efficiency of electrolyte in the thickened electrode and the liquid retention capacity of the cell, and reduce the polarization degree of the polarization area.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a stacked battery cell and battery. Background Technology

[0002] In the current field of electrochemical energy storage, high energy density has become one of the core requirements for battery technology iteration. To achieve improved energy density, the industry generally adopts the technical approach of increasing electrode thickness. However, this approach also leads to problems such as uneven wetting of the electrolyte inside the electrode and reduced electrolyte retention capacity. Specifically, increasing electrode thickness makes it difficult for the electrolyte to quickly and uniformly penetrate deep into the electrode pores, significantly reducing wetting efficiency. To improve this problem, existing technologies require auxiliary measures such as extending the immersion time, optimizing the electrolyte solvent composition, or increasing the temperature of the high-temperature static environment. This not only increases the complexity and cost of the production process but may also have a potential impact on battery stability.

[0003] Meanwhile, at the electrode structure design level, existing solutions suffer from significant mass transfer and polarization inhomogeneity issues. For example, high-polarization regions form near the tab in areas with high current density, while low-polarization regions form in the center of the electrode. The electron pathway impedance and charge transfer impedance near the tab are concentrated and superimposed, easily inducing local overpotential peaks. Furthermore, the geometric distance from the center of the electrode to the edge of the tab is close to the liquid phase mass transfer limit, and the diffusion flux of lithium ions at this scale cannot match the current demand. Consequently, the diffusion impedance increases significantly, ultimately causing the potential in the center region of the electrode to be further lowered, forming a high-polarization center relative to the edge polarization peak. These problems collectively lead to a decline in battery rate performance, cycle stability, and safety, becoming a core obstacle restricting the practical application of high-energy-density batteries. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a stacked battery cell that can effectively improve the wetting efficiency and wetting uniformity of the electrolyte in the thickened electrode, enhance the electrolyte retention capacity of the electrode, and reduce the polarization degree in both high-polarization and low-polarization regions.

[0005] This application also proposes a battery having the above-mentioned stacked cells.

[0006] According to the first aspect of the present application, a stacked battery cell includes: The main structure is provided with a clearance hole that penetrates the main structure along its thickness direction; A support tube is inserted through the relief hole; the support tube extends through the center axis to form a through hole for the flow of electrolyte, and the sidewall of the through hole can absorb electrolyte.

[0007] The laminated battery cell according to the embodiments of this application has at least the following beneficial effects: By setting clearance holes in the main structure of the stacked cell and inserting hollow support tubes that can absorb electrolyte through the clearance holes, the through holes of the support tubes provide a fast channel for electrolyte flow, thereby facilitating the rapid and uniform penetration of electrolyte into the interior of the thickened electrode and improving the electrolyte retention capacity of the electrode. By absorbing electrolyte and providing electrolyte flow channels, the support tubes can reduce the degree of polarization at the edge of the tab and the center of the electrode, thereby improving the rate performance, cycle stability and safety of the battery.

[0008] In some embodiments of this application, the main structure includes an electrode assembly and an electrode tab assembly, the electrode assembly having a first polarization region, and the support tube passing through the first polarization region; The first polarization region is located on the outer periphery of the tab group.

[0009] In some embodiments of this application, the main structure is formed by stacking multiple electrode sheets, each electrode sheet including a coating area and a blank foil area, the coating area being coated with an active material layer, and the blank foil area forming an electrode tab; multiple coating areas are stacked to form an electrode sheet group, and multiple electrode tabs are stacked to form an electrode tab group; The electrode assembly has a first polarization region, which is located on the outer periphery of the electrode assembly, and the support tube passes through the first polarization region.

[0010] In some embodiments of this application, the main structure includes a positive electrode plate and a negative electrode plate. The positive electrode plate is provided with a first through hole penetrating the positive electrode plate, and the negative electrode plate is provided with a second through hole penetrating the negative electrode plate. The first through hole and the second through hole are concentrically arranged to form the clearance hole. The diameter of the first through hole is larger than the diameter of the second through hole.

[0011] In some embodiments of this application, the main structure further includes a diaphragm disposed between the positive electrode and the negative electrode; the diaphragm has a third through hole penetrating the diaphragm, the diameter of the third through hole being larger than the outer diameter of the support tube, and the diameter of the third through hole being less than or equal to the diameter of the second through hole.

[0012] In some embodiments of this application, the support tube includes a resin substrate, and the resin substrate is provided with a ceramic particle reinforcing phase.

[0013] In some embodiments of this application, the support tube includes a base film layer and an oxide ceramic coating, wherein the oxide ceramic coating is disposed on the inner and / or outer surfaces of the base film layer.

[0014] In some embodiments of this application, the support tube includes a nonwoven fabric layer and a nanofiber layer, wherein the nanofiber layer is disposed on the inner and / or outer surfaces of the nonwoven fabric layer.

[0015] In some embodiments of this application, the support tube includes an aramid fiber skeleton and a ceramic insert. The ceramic insert grows on the fiber surface of the aramid fiber skeleton and is embedded in the gaps between the fibers to connect with the aramid fiber skeleton as an integral structure.

[0016] The battery according to the second aspect of this application includes the above-described stacked cell; since the battery includes the above-described stacked cell, it has at least all the beneficial effects of the above-described stacked cell, which will not be elaborated here.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a front view of a stacked battery cell according to the first aspect of this application; Figure 2 for Figure 1 Sectional view along the AA direction; Figure 3 for Figure 2 Enlarged view of point B in the middle.

[0019] Icon labels: Main structure 100, clearance hole 101, electrode group 110, first polarization region 111, second polarization region 112, tab group 120, positive electrode 130, first through hole 131, negative electrode 140, second through hole 141, diaphragm 150, third through hole 151; Support tube 200, through hole 210. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. The embodiments of this application may omit unnecessary detailed descriptions. For example, detailed descriptions of well-known matters and repeated descriptions of actually identical structures may be omitted. This is to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art.

[0021] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0022] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0023] In the description of this application, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 a limitation of this application.

[0024] In the description of this application, "multiple" refers to two or more. The use of "first" and "second" is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or the order in which the technical features are indicated.

[0025] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0026] Increasing electrode thickness, as a technical means to improve battery density and capacity, can lead to problems such as uneven electrolyte wetting, low wetting efficiency, and poor electrolyte retention. This not only affects production efficiency but also easily creates polarization regions in areas of high current density and slow ion diffusion on the electrode, thereby affecting the battery's rate performance, cycle stability, and safety. To solve the above-mentioned technical problems, the first aspect of this application discloses a stacked battery cell that can effectively solve the problems of uneven electrolyte wetting, low wetting efficiency, and poor electrolyte retention within the thickened electrode. The technical solution of this application will be described in detail below with reference to the accompanying drawings.

[0027] Reference Figures 1 to 3The laminated battery cell of this application includes a main structure 100 and a support tube 200. The main structure 100 includes a positive electrode 130, a negative electrode 140, and a separator 150. Multiple positive electrode 130s and multiple negative electrode 140s are stacked alternately, and the separator 150 is disposed between the positive electrode 130s and the negative electrode 140s. The positive electrode 130 has a first through hole 131 penetrating the positive electrode 130, the negative electrode 140 has a second through hole 141 penetrating the negative electrode 140, and the separator 150 has a third through hole 151. The first through hole 131, the second through hole 141, and the third through hole 151 are concentrically arranged to form a clearance hole 101 penetrating the main structure 100.

[0028] A support tube 200 passes through the clearance hole 101, and the central axis of the support tube 200 extends through to form a through hole 210 for electrolyte flow. The sidewall of the through hole 210 can absorb electrolyte. Currently, when thickening the battery cell, the electrolyte can only gradually wet the inside of the cell through the edge, resulting in low wetting efficiency and uneven wetting effect inside the cell. By setting a hollow support tube 200 that can absorb electrolyte, it is equivalent to increasing the channel for electrolyte to wet the inside of the cell, thereby greatly improving the efficiency of electrolyte wetting inside the cell and the uniformity of electrolyte wetting at various locations within the cell. The support tube 200 can absorb electrolyte, thus increasing the electrolyte storage capacity inside the battery and the cell's ability to retain electrolyte, delaying the occurrence of electrolyte drying during battery cycling, thereby delaying the increase in interfacial impedance and improving the capacity retention rate throughout the battery's life cycle. In addition, the support tube 200 that runs through the main structure 100 can also support the thickened battery cell and improve the stability of the main structure 100.

[0029] In some embodiments of this application, the clearance hole 101 is preferably a cylindrical hole, and the support tube 200 is also preferably a cylindrical tube to reduce manufacturing difficulty and improve the uniformity of wetting. However, depending on actual needs, the support tube 200 can also be configured as a prism or other shapes.

[0030] In some embodiments of this application, the main structure 100 is provided with a plurality of clearance holes 101, and a support tube 200 passes through each of the plurality of clearance holes 101. The positions of the plurality of clearance holes 101 can be specifically set according to actual conditions, but they are usually set at positions where polarization is likely to occur on the electrode. Specifically, during normal use, the current at different positions of the laminated cell is uneven, which can easily lead to polarization. For example, the positive electrode 130 is provided with a positive tab, and the negative electrode 140 is provided with a negative tab. The positive and negative tabs serve as current entry and exit channels, so the current density and ion concentration are high near the positive and negative tabs, making polarization more likely. Conversely, the ion concentration is low in the middle of the cell due to the high ion diffusion resistance and low velocity, resulting in a polarization center. To avoid polarization near the positive and negative tabs and in the middle of the cell, it is preferable to set the support tube 200 near the positive and negative tabs and in the middle of the cell to reduce the degree of polarization in the polarization region.

[0031] Specifically, refer to Figure 1 As shown, the main structure 100 is composed of multiple stacked electrode sheets. Each electrode sheet includes a coating area and an empty foil area, which are usually integrated into one structure. The coating area is coated with an active material layer, and the empty foil area forms an electrode tab, for example, by laser cutting. Multiple coating areas are stacked to form an electrode sheet group 110, and multiple electrode tabs are stacked to form an electrode tab group 120. The electrode sheet group 110 is provided with a first polarization region 111 and a second polarization region 112. The first polarization region 111 is located on the outer periphery of the electrode tab group 120, and the second polarization region 112 is located in the middle of the electrode sheet group 110. Both the first polarization region 111 and the second polarization region 112 are provided with a support tube 200. The first polarization region 111 is equipped with a support tube 200, which can assist ions to diffuse outward rapidly, thereby reducing the ion concentration near the tab group 120 and reducing the probability of polarization. The second polarization region 112 is equipped with a support tube 200, which can bring more ions to the middle position of the cell and increase the diffusion speed of ions into the second polarization region 112, thereby increasing the ion concentration in the second polarization region 112 and reducing the degree of polarization near the tab group 120 and the center region of the cell.

[0032] Reference Figure 1 As shown, there are two electrode tab groups 120. The stacked electrode sheets include positive electrode sheets and negative electrode sheets. The positive electrode tabs of multiple positive electrode sheets 130 form a positive electrode tab group 120, and the negative electrode tabs of multiple negative electrode sheets 140 form a negative electrode tab group 120. The outer periphery of both the positive electrode tab group 120 and the negative electrode tab group 120 is provided with a first polarization region 111.

[0033] In some embodiments, the positive electrode tab is welded to the positive electrode plate 130, and / or the negative electrode tab is welded to the negative electrode plate 140. When the positive electrode tab is welded to the positive electrode plate 130 and the negative electrode tab is welded to the negative electrode plate 140, it is possible to provide a first polarization region 111 in the welding area between the positive electrode tab and the positive electrode plate 130, and at the same time, provide a first polarization region 111 in the welding area between the negative electrode tab and the negative electrode plate 140.

[0034] Furthermore, Figure 1 The number of support tubes 200 shown is for reference only. In actual products, one or more support tubes 200 can be installed in the first polarization region 111. Similarly, one or more support tubes 200 can be installed in the second polarization region 112 as needed. This embodiment does not impose any limitations. Typically, multiple support tubes 200 are installed in the second polarization region 112, and the number of support tubes 200 installed in the second polarization region 112 will be significantly greater than the number of support tubes 200 installed in the first polarization region 111.

[0035] Furthermore, referring to Figure 1 As shown, the diameters of the clearance holes 101 in the two first polarization regions 111 can be set to be equal or unequal according to actual needs, and the diameters of the support tubes 200 can also be set to be the same or different according to actual needs. Similarly, the diameters of the clearance holes 101 in the first polarization region 111 can be equal or unequal to the diameters of the clearance holes 101 in the second polarization region 112, and the diameters of the support tubes 200 passing through the first polarization region 111 can be the same or different from the diameters of the support tubes 200 passing through the second polarization region 112. This is not limited in this embodiment. For example, when only one support tube 200 passes through the first polarization region 111, while multiple support tubes 200 pass through the second polarization region 112, the diameter of the support tube 200 passing through the first polarization region 111 can be set to be larger than the diameter of the support tube 200 passing through the second polarization region 112, depending on the actual situation.

[0036] Furthermore, when the second polarization region 112 is provided with multiple support tubes 200, the diameters of the multiple support tubes 200 can be set to be the same or different according to the actual situation. For example, the diameters of the multiple support tubes 200 can be increased or decreased sequentially around the circumference, or the diameter of the support tube 200 near the center of the first polarization region 111 can be larger than the diameter of the support tube 200 on its outer periphery.

[0037] In some embodiments of this application, to facilitate the installation of the support tube 200, the outer diameter of the support tube 200 is usually smaller than the diameter of the clearance hole 101. Specifically, the diameter of the clearance hole 101 at different locations may also vary. For example, the diameter of the first through hole 131 on the positive electrode 130 is preferably larger than the diameter of the second through hole 141 on the negative electrode 140 to ensure that the active material on the positive electrode 130 has a corresponding active material on the negative electrode 140; the diameter of the third through hole 151 on the separator 150 is preferably less than or equal to the diameter of the second through hole 141 on the negative electrode 140 to ensure that the active material of the negative electrode 140 is covered by the separator 150, avoiding direct contact between the active material of the positive electrode 130 and the active material of the negative electrode 140. Depending on the processing method of the through holes, the diameter of the second through hole 141 and the diameter of the third through hole 151 can be reasonably set. For example, if the diaphragm 150 is thermally bonded to the negative electrode 140 and then laser die-cutting is performed to process the second through hole 141 and the third through hole 151, the diameters of the second through hole 141 and the third through hole 151 can be set to be equal.

[0038] In some embodiments of this application, as can be seen from the above, the main structure 100 is provided with a plurality of clearance holes 101. Preferably, the diameters of the plurality of first through holes 131, the diameters of the plurality of second through holes 141, and the diameters of the plurality of third through holes 151 are equal, so as to reduce production costs.

[0039] In some embodiments of this application, the support tube 200 can be made of different materials and in different battery types to suit different application scenarios; several specific embodiments of the support tube 200 are listed below.

[0040] Example 1: The support tube 200 includes a resin substrate, and a ceramic particle reinforcing phase is disposed within the resin substrate; Specifically, the support tube 200 in this embodiment is manufactured through the following steps: 1. Mix resin raw materials at a low glass transition temperature, such as less than 20°C; 2. Ceramic particles are added to and mixed into the resin raw material at a high glass transition temperature, such as greater than 40°C; 3. Casting is used to create a base film with a thickness of 50 to 100 micrometers; 4. Perform semi-curing of the base film at a set temperature, which can be set to 80℃; 5. The base film is rolled into a support tube of 200mm using a hot roller; 6. Perform secondary UV cross-linking and shaping on the 200mm roll of the support tube.

[0041] In specific embodiments, the support tube 200 in Embodiment 1 is typically required to remain crack-free when folded 180 degrees while maintaining a ceramic content ≤60wt%; the coil radius of the support tube 200 is greater than or equal to 3mm, the porosity is 55% to 70%, and the liquid absorption rate is 180% to 220%; the storage modulus at 25℃ is 150MPa to 300MPa, and remains above 80% at 120℃; the electrical conductivity of the support tube 200 after loading the electrolyte is greater than or equal to 1mScm. -1 .

[0042] Example 2: The support tube 200 includes a base film layer and an oxide ceramic coating, wherein the inner surface and / or outer surface of the base film layer are provided with an oxide ceramic coating.

[0043] Specifically, in this second embodiment, the base film layer of the support tube 200 is made of PI material, with a thickness of 15µm to 25µm, a pore size of 0.2µm to 1µm, and a porosity of 50% to 70%. The oxide ceramic coating is made of graphitic carbon nitride and nano-ceramic particles, which can be one or more of Al2O3, SiO2, and TiO2. The base film layer and the oxide ceramic layer can be made of a semi-crystalline fluorinated copolymer composed of 5wt% to 10wt% PVDF-HFP fluoroethylene and hexafluoropropylene.

[0044] The support tube 200 in Example 2 is manufactured through the following steps: 1. The base film layer is rolled into a support tube of 200mm using a hot roller; 2. The lap joints of the 200mm roll of support pipe are formed by laser welding or hot-press sealing to create a base film layer; 3. Apply an oxide ceramic coating to the inner and / or outer surfaces of the base film layer.

[0045] In specific embodiments, the support tube 200 in Embodiment 2 is typically required to have a porosity of 50% to 65% and be resistant to HF corrosion; experimental data show that by adding the support tube 200 in Embodiment 2, the battery cycle life can be improved by 15% to 25%.

[0046] Example 3: The support tube 200 includes a non-woven fabric layer and a nanofiber layer, and the inner and / or outer surfaces of the non-woven fabric layer are provided with nanofiber layers.

[0047] Specifically, in this embodiment three, the nonwoven fabric layer of the support tube 200 can be made of PET or PI nonwoven fabric with a thickness of 20 to 40 micrometers, and the nanofiber layer is made of PVDF-HFP with Al2O3 nanomaterials with a thickness of 5 to 10 micrometers through electrostatic weaving. Preferably, the nanofiber layer is only provided on the inner surface of the nonwoven fabric layer in the support tube 200 of embodiment three.

[0048] The support tube 200 in Example 3 is manufactured through the following steps: 1. Nonwoven fabric layers are produced by wet papermaking, and nanofiber layers are produced by electrostatic spinning; 2. The nonwoven fabric layer and the nanofiber layer are hot-rolled at a set temperature to bond them together to form the support tube 200 substrate; the set temperature can be, for example, 120°C. 3. Cut the substrate to the appropriate size; 4. The substrate is rolled into a tube using a hot roller; for example, the temperature of the hot roller can be set to 180℃, and the processing time is about 5 seconds. 5. Weld the pipe joint to form the support pipe 200, for example, by laser welding.

[0049] In a specific embodiment, the liquid absorption rate of the support tube 200 in Embodiment 3 is approximately 200% to 250%, and the puncture strength is high.

[0050] Example 4: The support tube 200 includes an aramid fiber skeleton and a ceramic insert. The ceramic insert covers the aramid fiber skeleton and interlocks with it to form an integral structure.

[0051] Specifically, the aramid fiber skeleton is made by three-dimensional weaving of aramid fibers. The woven aramid fiber skeleton has low structural strength and poor stability. Then, ceramic inserts are wrapped on the aramid fiber skeleton to obtain a support tube 200 that meets the requirements of structural strength and stability.

[0052] The support tube 200 in Example 4 is manufactured through the following steps: 1. A sol-gel doped with nanomaterials such as Al2O3 is coated onto aramid fiber woven fabric; 2. Calcine at a first set temperature to form a substrate, for example, 600°C; 3. Roll the substrate to the set thickness; 4. The substrate is rolled into a tube using hot rollers; 5. Place the tube at the second set temperature for the set time to complete the shaping.

[0053] In a specific embodiment, the porosity of the support tube 200 in Embodiment 4 is about 45% to 60%, the electrolyte absorption rate is about 180%, the support tube 200 does not decompose or shrink at 400℃, and the closed-cell temperature is about 200℃, which balances safety and electrolyte retention.

[0054] The above only lists four types of support tubes 200 applicable to different types of battery cells or scenarios. In actual production practice, support tubes 200 that meet actual needs can be prepared according to actual requirements. No further limitations are made in this embodiment.

[0055] The second aspect of this application discloses a battery comprising the aforementioned stacked cells; since the battery comprises the aforementioned stacked cells, it has at least all the beneficial effects of the aforementioned stacked cells, which will not be elaborated here.

[0056] Throughout this specification, references to "implementation method," "partial implementation method," "one implementation method," "another method," "specific method," or "partial method" mean that at least one implementation method or embodiment in this application includes the specific features, structures, materials, or characteristics described in that implementation method or embodiment.

[0057] In this application, numerical ranges are involved. Unless otherwise specified, the numerical ranges mentioned above are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form an unspecified range.

[0058] Although illustrative embodiments have been demonstrated and described, those skilled in the art should understand that the above embodiments should not be construed as limiting the invention, and that changes, substitutions and modifications can be made to the embodiments without departing from the spirit, principles and scope of the invention.

Claims

1. A laminated battery cell, characterized in that, include: The main structure is provided with a clearance hole that penetrates the main structure along its thickness direction; A support tube is inserted through the relief hole; the central axis of the support tube extends through to form a through hole, and the sidewall of the through hole can absorb electrolyte.

2. The laminated cell according to claim 1, characterized in that, The main structure is composed of multiple stacked electrode sheets, each electrode sheet including a coating area and a blank foil area. The coating area is coated with an active material layer, and the blank foil area forms an electrode tab. Multiple coating areas are stacked to form an electrode sheet group, and multiple electrode tabs are stacked to form an electrode tab group. The electrode assembly has a first polarization region, which is located on the outer periphery of the electrode assembly, and the support tube passes through the first polarization region.

3. The laminated cell according to claim 1, characterized in that, The main structure includes an electrode assembly, with a second polarization region at the center of the electrode assembly, and at least one support tube passing through the second polarization region.

4. The laminated cell according to claim 1, characterized in that, The main structure includes a positive electrode plate and a negative electrode plate. The positive electrode plate is provided with a first through hole penetrating the positive electrode plate, and the negative electrode plate is provided with a second through hole penetrating the negative electrode plate. The first through hole and the second through hole are concentrically arranged to form the clearance hole. The diameter of the first through hole is larger than the diameter of the second through hole.

5. The laminated cell according to claim 4, characterized in that, The main structure also includes a diaphragm disposed between the positive electrode and the negative electrode; the diaphragm has a third through hole penetrating the diaphragm, the diameter of the third through hole is larger than the outer diameter of the support tube, and the diameter of the third through hole is less than or equal to the diameter of the second through hole.

6. The laminated cell according to claim 1, characterized in that, The support tube includes a resin substrate, and the resin substrate contains a ceramic particle reinforcing phase.

7. The laminated cell according to claim 1, characterized in that, The support tube includes a base film layer and an oxide ceramic coating, wherein the oxide ceramic coating is disposed on the inner and / or outer surfaces of the base film layer.

8. The laminated cell according to claim 1, characterized in that, The support tube includes a non-woven fabric layer and a nanofiber layer, and the nanofiber layer is disposed on the inner and / or outer surfaces of the non-woven fabric layer.

9. The laminated cell according to claim 1, characterized in that, The support tube includes an aramid fiber skeleton and a ceramic insert. The ceramic insert grows on the fiber surface of the aramid fiber skeleton and is embedded in the gaps between the fibers to connect with the aramid fiber skeleton into an integral structure.

10. A battery, characterized in that, Includes the laminated battery cell as described in any one of claims 1 to 9.

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