Cylindrical battery monomer, battery, electric device and lining

Abstract

The embodiment of the utility model provides a cylindrical battery monomer, a battery, a power utilization device and a lining, and belongs to the technical field of batteries. The cylindrical battery cell comprises: a liner comprising a cylindrical tubular net structure woven by wires; and the winding battery core is wound outside the lining. Through the arrangement of the lining and the shape design of the cylindrical pipe type net structure, the problem of collapse of the central hole of the winding battery cell is effectively improved by adopting the structure, and the purpose that the lining supports the central hole of the winding battery cell is achieved, so that continuous deterioration of the collapse situation of the central hole in a cycle period is inhibited, the weight of the lining is reduced, and the service life of the winding battery cell is prolonged. Therefore, the energy density of the cylindrical battery monomer is improved, the overall miniaturization and lightweight design is realized, the surface of the lining has no convex structure, and the influence of the lining on the winding battery cell is reduced as much as possible.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a cylindrical battery cell, a battery, an electrical device and an inner liner. Background Art

[0002] As market competition becomes increasingly fierce, the performance requirements for battery cells are getting higher and higher. In order to improve the volume energy density, the process of cylindrical battery cells is gradually being used more frequently. However, in actual applications, as the number of cycles of cylindrical battery cells increases, the pole pieces are prone to expansion, causing the center hole of the wound battery cell to collapse, and in severe cases it may even lead to lithium deposition on the pole pieces. Utility Model Content

[0003] The present application provides a cylindrical battery cell, a battery, an electrical device and an inner liner to improve the problem of central hole collapse of a wound battery cell, inhibit the continuous deterioration of the central hole collapse during a cycle, reduce the weight of the inner liner, and improve the energy density of the cylindrical battery cell.

[0004] In a first aspect, an embodiment of the present application provides a cylindrical battery cell, comprising:

[0005] The lining includes a cylindrical tubular mesh structure made of braided wire;

[0006] The wound battery cell is wound outside the inner liner.

[0007] In the above technical scheme, through the setting of the above-mentioned lining and the shape design of the cylindrical tubular mesh structure, this structure is adopted to effectively improve the problem of collapse of the center hole of the wound battery cell, and the lining forms a supporting effect on the center hole of the wound battery cell, thereby suppressing the continuous deterioration of the collapse of the center hole during the cycle period, and reducing the weight of the lining at the same time, thereby improving the energy density of the cylindrical battery cell, realizing overall miniaturization and lightweight design, and there is no protruding structure on the surface of the lining, thereby minimizing the impact of the lining on the wound battery cell.

[0008] In some embodiments, the outer diameter of the liner is smaller than the central hole diameter of the wound battery cell.

[0009] In some embodiments, a ratio D1 / D2 of an outer diameter of the liner to a diameter of a central hole of the wound battery core satisfies: 0.6≤D1 / D2≤0.85.

[0010] In the above technical scheme, by limiting the range of the ratio D1 / D2 of the outer diameter of the liner to the diameter of the center hole of the wound battery cell, it is prevented that the ratio D1 / D2 of the outer diameter of the liner to the diameter of the center hole of the wound battery cell is too large to squeeze the inner wall of the center hole and cause damage to the pole piece or the diaphragm, thereby reducing the influence of the liner size on the wound battery cell, facilitating the assembly of the liner and the wound battery cell, and preventing the ratio D1 / D2 of the outer diameter of the liner to the diameter of the center hole of the wound battery cell from being too small to support the center hole of the wound battery cell, thereby further improving the problem of collapse of the center hole of the wound battery cell.

[0011] In some embodiments, the mesh-like hollow holes of the liner include multiple edges.

[0012] In some embodiments, the wire of the liner is a metal coated with an insulation layer.

[0013] In the above technical scheme, by designing the wire as a metal material coated with an insulating layer and combining it with the elastic properties of the wire, it is possible to achieve the assembly of the liner after the sleeve is sleeved outside the liner to assist in assembly and then the sleeve is taken out, thereby preventing the sharp end of the wire from scratching the inner wall of the center hole due to direct insertion into the liner, reducing the probability of the wound battery cell being damaged during the assembly process, and at the same time reducing the conductivity of the liner and improving the corrosion resistance of the liner, thereby improving the durability of the liner and saving material costs.

[0014] In some embodiments, the diameter D3 of the wire satisfies: 0.1 mm ≤ D3 ≤ 0.5 mm.

[0015] In some embodiments, at least a portion of the liner is immersed in the electrolyte of the cylindrical battery cell, and the wire material of the liner is a swelling synthetic resin.

[0016] In the above technical scheme, by designing the wire material as a swelling synthetic resin, it is possible to directly assemble the contracted lining into the central hole of the wound battery cell and expand to form a support when immersed in the electrolyte. No other workpieces are required for auxiliary assembly, which reduces processing costs and improves production efficiency, which is conducive to mass production. At the same time, the resin material has no sharp burrs on the surface and has high stability, which reduces the safety problem of short circuit caused by puncturing the pole piece or diaphragm by the burrs of the lining.

[0017] In some embodiments, the diameter D3 of the wire satisfies: 0.4 mm ≤ D3 ≤ 0.6 mm.

[0018] In a second aspect, an embodiment of the present application provides a battery, comprising:

[0019] A plurality of cylindrical battery cells as described above.

[0020] In a third aspect, an embodiment of the present application provides an electrical device, including:

[0021] As the battery mentioned above, the battery is used to provide electrical energy to the electrical device.

[0022] In a fourth aspect, an embodiment of the present application provides a liner applied to a cylindrical battery cell, comprising:

[0023] Cylindrical tubular mesh structure made of wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0026] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0027] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0028] Figure 4 A schematic diagram of the structure of a wound battery cell provided in some embodiments of the present application;

[0029] Figure 5 A schematic diagram of the assembly of a wound battery core, a sleeve and a liner provided in some embodiments of the present application;

[0030] Figure 6 A schematic diagram of the assembly of a casing and a liner provided in some embodiments of the present application;

[0031] Figure 7 One of the structural schematic diagrams of the liner provided in some embodiments of the present application;

[0032] Figure 8 The second structural schematic diagram of the liner provided in some embodiments of the present application;

[0033] Fig. 9 The third structural schematic diagram of the liner provided in some embodiments of the present application.

[0034] Reference numerals:

[0035] Vehicle 1, motor 20, controller 30;

[0036] Battery 10;

[0037] Battery box 11, first box body 111, second box body 112;

[0038] Cylindrical battery cell 12, lining 121, wire 1211, wound battery cell 122;

[0039] Casing 2. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0042] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0045] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0046] The battery cells mentioned in the embodiments of the present application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. The battery cells may be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application.

[0047] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0048] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0049] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0050] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety and cycle life.

[0051] The inventors found that in general cylindrical battery cells, as the number of cycles increases, the pole piece tends to expand, causing the central hole of the wound battery cell to collapse, and in severe cases even causing lithium deposition of the pole piece. Therefore, in the related art, a winding liner and a long cylindrical battery are designed, wherein the winding liner is used to support the battery cell and transmit the winding action of the pole piece and the diaphragm of the battery cell, the diaphragm is bonded to the winding liner, and the number of sides of the winding liner is greater than 3. By leaving the polygonal columnar winding liner inside the wound battery, an internal support for the battery cell is formed to alleviate the problem of the inner circle of the battery cell being biased when the needle is pulled out after the winding is completed. However, in the above scheme, the weight of the polygonal columnar winding liner is too large, which makes the energy density of the cylindrical battery cell too small, causing the capacity of the battery to be affected; in addition, the raised parts of the polygonal columnar winding liner may cause damage to the inside of the battery cell, causing the battery cell to be prone to short circuit.

[0052] Based on the above considerations, in order to solve the problem of collapse of the center hole of the wound battery cell and excessive weight of the wound lining, the inventors have designed a cylindrical battery cell after in-depth research, including: a lining and a wound battery cell, the lining including a cylindrical tubular mesh structure made of wire; the wound battery cell is wound outside the lining.

[0053] In a cylindrical battery cell of this structure, the inner lining is set as a cylindrical tubular mesh structure made of wire. This structure effectively improves the problem of collapse of the center hole of the wound battery cell, realizes the supporting effect of the inner lining on the center hole of the wound battery cell, and greatly reduces the weight of the inner lining, thereby improving the energy density of the cylindrical battery cell, and then increasing the capacity of the entire battery, and making the contact surface between the inner lining and the wound battery cell free of protruding structures, thereby minimizing the influence of the inner lining on the wound battery cell.

[0054] The battery disclosed in the embodiment of the present application can be used in, but is not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery thermal management system disclosed in the present application and batteries etc. can be used to form the electrical device, which is conducive to improving the scope of application of the battery thermal management system and reducing the difficulty of assembling the battery thermal management system.

[0055] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0056] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device in an embodiment of the present application.

[0057] like Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 20, a controller 30 and a battery 10 may be arranged inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 20. For example, a battery 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0058] In order to meet different power usage requirements, the battery 10 may include a plurality of battery cells 12 , wherein the plurality of battery cells 12 may be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series connection and parallel connection.

[0059] like Figure 2As shown, it is an exploded view of the structure of a battery 10 of an embodiment of the present application. The battery 10 includes a box body 11 and a plurality of battery cells 12, and the battery cells 12 are used to be accommodated in the box body 11. Among them, the box body 11 is used to provide an assembly space for the battery cells 12, and the box body 11 can adopt a variety of structures. In some embodiments, the box body 11 may include a first box body 111 and a second box body 112, and the first box body 111 and the second box body 112 cover each other, and the first box body 111 and the second box body 112 jointly define an assembly space for accommodating the battery cells 12. The second box body 112 can be a hollow structure with one end open, and the first box body 111 can be a plate-like structure. The first box body 111 covers the open side of the second box body 112, so that the first box body 111 and the second box body 112 jointly define an assembly space; the first box body 111 and the second box body 112 can also be hollow structures with one side open, and the open side of the first box body 111 covers the open side of the second box body 112. Of course, the box body 11 formed by the first box body 111 and the second box body 112 can be in various shapes, such as a cylinder, a cuboid, etc.

[0060] In the battery 10, multiple battery cells 12 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells 12 are connected in series and in parallel. Multiple battery cells 12 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells 12 is accommodated in the box 11; of course, the battery 10 can also be a battery module formed by connecting multiple battery cells 12 in series, in parallel, or in a mixed connection, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery 10 can also include other structures, for example, the battery 10 can also include a converging component for realizing the electrical connection between multiple battery cells 12.

[0061] Each battery cell 12 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 12 may be cylindrical, flat, rectangular, or in other shapes, which are not limited here.

[0062] According to some embodiments of the present application, Figure 3 As shown, the present application provides a cylindrical battery cell 12, which includes an inner liner 121 and a wound battery cell 122. The inner liner 121 includes a cylindrical tubular mesh structure woven from wires 1211; the wound battery cell 122 is wound outside the inner liner 121.

[0063] The wound battery cell 122 may include a positive electrode sheet, a negative electrode sheet and a separator. Specifically, the separator-positive electrode sheet-separator-negative electrode sheet may be stacked and then the stacked whole may be rolled into a layered core shape. Finally, the tail glue may be used to fix the core to prevent it from unravelling, thereby obtaining the wound battery cell 122.

[0064] It is understandable that the wound battery cell can be a hollow structure. In the absence of other supporting structures, the center hole of the wound battery cell is prone to collapse during the long-term use cycle of the electrode assembly, that is, the innermost circle of the electrode or diaphragm moves closer to the center hole, and the cross-sectional area of ​​the center hole after collapse is smaller than the cross-sectional area of ​​the initial center hole.

[0065] The lining 121 may be mesh-shaped, and a plurality of wires 1211 may be interlaced and woven together into a cylindrical tubular mesh structure. The length of the lining 121 may be greater than the length of the wound battery cell 122 . In other words, at least part of the lining 121 is located outside the wound battery cell 122 .

[0066] The lining 121 may be made of metal, resin or other materials, which are not limited here.

[0067] The lining 121 may be woven from a plurality of wires 1211 , wherein a plurality is 2 or more wires. For example, in some embodiments, the lining 121 is woven from 8 wires 1211 .

[0068] In actual implementation, Figure 3-Figure 9 As shown, the positive electrode sheet, the negative electrode sheet and the separator are wound to obtain a wound battery cell 122, and the cylindrical tubular mesh liner 121 is slowly inserted into the center hole from one end of the wound battery cell 122 until the end of the liner 121 entering the center hole reaches the other end of the wound battery cell 122. At this time, the liner 121 still at least partially extends out of the center hole of the wound battery cell 122 to facilitate subsequent maintenance of the liner 121. During the cycle period of the electrode assembly, as the number of cycles increases, even if the inner wall of the center hole has a tendency to collapse downward due to insufficient supporting force, the liner 121 located in the center hole can also support the center hole, thereby suppressing the collapse of the center hole from further deteriorating.

[0069] The cylindrical battery cell 12 provided in the present application, through the setting of the above-mentioned liner 121 and the shape design of the cylindrical tubular mesh structure, adopts this structure to effectively improve the problem of collapse of the center hole of the wound battery cell 122, and realizes that the liner 121 forms a supporting effect on the center hole of the wound battery cell 122, thereby suppressing the continuous deterioration of the collapse of the center hole during the cycle period, and at the same time reducing the weight of the liner 121, thereby improving the energy density of the cylindrical battery cell 12, and realizing the overall miniaturization and lightweight design, and there is no protruding structure on the surface of the liner 121, which minimizes the impact of the liner 121 on the wound battery cell 122.

[0070] According to some embodiments of the present application, Figure 3-Figure 5 As shown, the outer diameter of the liner 121 may be smaller than the central hole diameter of the wound battery core 122 .

[0071] It can be understood that if the outer diameter of the liner is not less than the diameter of the center hole of the wound battery cell, that is, the outer diameter of the liner is greater than or equal to the diameter of the center hole of the wound battery cell, the liner will then stop against the inner wall of the center hole of the wound battery cell. When the outer diameter of the liner is too large, an interference fit may even be formed between the liner and the center hole of the wound battery cell. An overly large liner may squeeze the entire wound battery cell outward through the center hole, causing damage to the electrode or diaphragm, and even the wound battery cell may become loose over time.

[0072] When the outer diameter of the liner 121 is smaller than the diameter of the center hole of the wound battery cell 122, this structure is used to form a clearance fit between the liner 121 and the center hole of the wound battery cell 122, thereby achieving the supporting effect of the liner 121 on the center hole of the wound battery cell 122 without squeezing the wound battery cell 122 outward. In addition, the liner 121 of appropriate size also makes it easy to assemble the liner 121 into the center hole of the wound battery cell 122.

[0073] According to some embodiments of the present application, Figure 4 , Figure 6 and Fig. 9 As shown, the ratio D1 / D2 of the outer diameter of the liner 121 and the central hole diameter of the wound battery core 122 can satisfy: 0.6≤D1 / D2≤0.85.

[0074] Specifically, the ratio D1 / D2 of the outer diameter of the liner 121 to the central hole diameter of the wound battery core 122 may be 0.6, 0.625, 0.75, 0.8, 0.85 or other values ​​between 0.6 and 0.85, which is not limited here.

[0075] The cylindrical battery cell 12 provided in the present application is prevented from squeezing the inner wall of the center hole and damaging the pole piece or diaphragm due to the ratio D1 / D2 of the outer diameter of the liner 121 to the center hole diameter of the wound battery cell 122 being too large by limiting the range of the ratio D1 / D2 of the outer diameter of the liner 121 to the center hole diameter of the wound battery cell 122, thereby reducing the influence of the size of the liner 121 on the wound battery cell 122, facilitating the assembly of the liner 121 and the wound battery cell 122, and preventing the ratio D1 / D2 of the outer diameter of the liner 121 to the center hole diameter of the wound battery cell 122 from being too small to support the center hole of the wound battery cell 122, thereby further improving the problem of collapse of the center hole of the wound battery cell 122.

[0076] According to some embodiments of the present application, Figure 6-Figure 9As shown, the mesh-like hollow holes of the liner 121 may include a plurality of sides.

[0077] The plurality of strips may be 3 or more. For example, in this embodiment, Figure 6-Figure 9 As shown, the mesh-like hollow holes of the liner 121 may include four sides.

[0078] In other embodiments, the mesh-like hollow holes of the liner 121 may include 6 sides.

[0079] In some other embodiments, the mesh-like hollow holes of the liner 121 may include 8 sides.

[0080] The length of each of the multiple sides may be equal. In other words, when the mesh hollow holes of the lining 121 include four sides, the lengths of the four sides may be the same.

[0081] At least two of the multiple edges may have unequal lengths. In other words, when the mesh hollow holes of the lining 121 include four edges, two of the four edges may have different lengths; or three of the four edges may have different lengths; or the lengths of the four edges may all be different.

[0082] The cylindrical battery cell 12 provided in the present application has a structural design of multiple edges through the mesh hollow holes of the above-mentioned lining 121, so that each minimum unit constituting the lining 121 has enough borders to support the overall frame. The weaving density of the wire 1211 can be increased according to actual needs to improve the structural strength of the lining 121 to provide sufficient supporting force to support the center hole of the wound battery cell 122.

[0083] According to some embodiments of the present application, Figure 5-Figure 7 As shown, the wire 1211 of the liner 121 may be a metal coated with an insulating layer.

[0084] The insulating layer can be used to prevent the lining 121 from being corroded. The material of the insulating layer can include but is not limited to silicon dioxide, germanium oxide, tin oxide or zirconium oxide.

[0085] The material of the wire 1211 may include, but is not limited to, stainless steel, aluminum alloy, or titanium alloy, etc., and is not limited here.

[0086] In actual implementation, Figure 5-Figure 7As shown, the wire 1211 can have a certain elasticity. During the assembly of the wire 1211, the sleeve 2 can be used to assist in the assembly. The sleeve 2 can be made of metal or other materials. The sleeve 2 can be a cylindrical tube. The liner 121 can be installed in the sleeve 2 in a compressed state, and the length of the liner 121 can be greater than the length of the sleeve 2, so that at least part of the liner 121 is located outside the sleeve 2. Based on the fact that the diameter of the sleeve 2 is smaller than the diameter of the liner 121 in the free state, the sleeve 2 can easily penetrate the center hole of the wound battery cell 122 during assembly. After the liner 121 and the sleeve 2 sleeved outside the liner 121 are inserted into the center hole, hold the sleeve 2 at one end and pull the part of the liner 121 located outside the wound battery cell 122 at the other end, and slowly pull the sleeve 2 outward until the sleeve 2 is completely pulled out and only the liner 121 is left installed in the center hole of the wound battery cell 122. In the process of pulling out the sleeve 2, the compressed liner 121 gradually rebounds to a free state.

[0087] When the wire 1211 of the liner 121 is a metal coated with an insulating layer, a ratio D4 / D5 of an outer diameter of the liner 121 compressed in the sleeve 2 to a central hole diameter of the wound battery core 122 may satisfy: 0.3≤D4 / D5≤0.5.

[0088] Specifically, when the wire 1211 of the liner 121 is a metal coated with an insulating layer, the ratio D4 / D5 of the outer diameter of the liner 121 compressed in the sleeve 2 to the central hole diameter of the wound battery core 122 can be 0.3, 0.325, 0.4, 0.45, 0.5 or other values ​​between 0.3 and 0.5, and is not limited here.

[0089] When the wire 1211 of the liner 121 is a metal coated with an insulating layer, the ratio D1 / D2 of the outer diameter of the liner 121 and the central hole diameter of the wound battery cell 122 after assembly can satisfy: 0.6≤D1 / D2≤0.75.

[0090] Specifically, when the wire 1211 of the lining 121 is a metal coated with an insulating layer, the ratio D1 / D2 of the outer diameter of the lining 121 to the central hole diameter of the wound battery cell 122 after assembly can be 0.6, 0.65, 0.667, 0.7, 0.75 or other values ​​between 0.6 and 0.75, and is not limited here.

[0091] The cylindrical battery cell 12 provided in the present application is designed with the above-mentioned wire 1211 as a metal material coated with an insulating layer. Combined with the elastic properties of the wire 1211, the sleeve 2 is sleeved on the outside of the liner 121 to assist in assembly and then the sleeve 2 is taken out to complete the assembly of the liner 121, thereby preventing the sharp end of the wire 1211 from scratching the inner wall of the center hole due to direct insertion into the liner 121, reducing the probability of the wound battery cell 122 being damaged during the assembly process, and at the same time reducing the conductivity of the liner 121, improving the corrosion resistance of the liner 121, thereby improving the durability of the liner 121 and saving material costs.

[0092] According to some embodiments of the present application, Figure 5-Figure 7 As shown, the diameter D3 of the wire 1211 can satisfy: 0.1mm≤D3≤0.5mm.

[0093] Specifically, the diameter D3 of the wire 1211 can be 0.1 mm, 0.265 mm, 0.35 mm, 0.4 mm, 0.5 mm or other values ​​between 0.1 mm and 0.5 mm, which is not limited here.

[0094] The cylindrical battery cell 12 provided in the present application, through the above-mentioned range limitation of the diameter D3 of the wire 1211 when the wire 1211 is made of metal material, prevents the diameter D3 of the wire 1211 from being too large, which causes the liner 121 to be too heavy and difficult to operate during the processing and weaving process, thereby reducing the weight of the liner 121 as much as possible, and at the same time reduces the processing difficulty, achieving cost control, and preventing the diameter D3 of the wire 1211 from being too small, which causes the wire 1211 to be insufficiently stiff and prone to brittle fracture, thereby extending the service life of the liner 121.

[0095] According to some embodiments of the present application, Figure 8-Figure 9 As shown, at least a portion of the liner 121 may be immersed in the electrolyte of the cylindrical battery cell 12 , and the wire material 1211 of the liner 121 may be a swelling type synthetic resin.

[0096] The swelling synthetic resin may include swelling glue, water-associated hydrogel or other materials, which are not limited here.

[0097] In actual implementation, Figure 8-Figure 9As shown, at least a portion of the wound battery cell 122 and at least a portion of the lining 121 can be immersed in the electrolyte. The wire 1211 based on the lining 121 is a swelling synthetic resin. The lining 121 before being immersed in the electrolyte can be in a contracted state, and the lining 121 after being immersed in the electrolyte can be in an expanded state. During the assembly of the wire 1211, the contracted lining 121 is slowly inserted into the center hole directly from one end of the wound battery cell 122 until the end of the lining 121 entering the center hole reaches the other end of the wound battery cell 122. The assembled wound battery cell 122 and the lining 121 are immersed in the electrolyte. After the lining 121 contacts the electrolyte, it quickly expands to a suitable size to play a supporting role.

[0098] When the wire 1211 of the liner 121 is a swelling synthetic resin, the ratio D6 / D7 of the outer diameter of the liner 121 before swelling to the central hole diameter of the wound battery core 122 may satisfy: 0.1≤D6 / D7≤0.3.

[0099] Specifically, when the wire 1211 of the lining 121 is a swelling synthetic resin, the ratio D6 / D7 of the outer diameter of the lining 121 before swelling to the central hole diameter of the wound battery core 122 can be 0.1, 0.15, 0.2, 0.275, 0.3 or other values ​​between 0.1 and 0.3, which is not limited here.

[0100] When the wire 1211 of the liner 121 is a swelling synthetic resin, the ratio D1 / D2 of the outer diameter of the liner 121 after swelling to the central hole diameter of the wound battery cell 122 may satisfy: 0.7≤D1 / D2≤0.85.

[0101] Specifically, when the wire 1211 of the lining 121 is a swelling synthetic resin, the ratio D1 / D2 of the outer diameter of the lining 121 after swelling to the central hole diameter of the wound battery core 122 can be 0.7, 0, 75, 0.775, 0.8, 0.825, 0.85 or other values ​​between 0.7 and 0.85, and is not limited here.

[0102] The cylindrical battery cell 12 provided in the present application is designed as a swelling synthetic resin material through the above-mentioned wire 1211, so that the contracted lining 121 can be directly assembled into the central hole of the wound battery cell 122 and expand to form a support when immersed in the electrolyte. No other workpieces are required for auxiliary assembly, which reduces processing costs and improves production efficiency, which is conducive to mass production. At the same time, the resin material surface has no sharp burrs and has high stability, which reduces the safety problem of short circuit caused by the burrs of the lining 121 piercing the pole piece or diaphragm.

[0103] According to some embodiments of the present application, Figure 8-Figure 9As shown, the diameter D3 of the wire 1211 can satisfy: 0.4mm≤D3≤0.6mm.

[0104] Specifically, the diameter D3 of the wire 1211 after swelling can be 0.4 mm, 0.425 mm, 0.5 mm, 0.55 mm, 0.6 mm or other values ​​between 0.4 mm and 0.6 mm, which is not limited here.

[0105] It should be noted that the diameter D8 of the wire 1211 before swelling may satisfy: 0.1 mm ≤ D3 ≤ 0.15 mm. Specifically, the diameter D8 of the wire 1211 before swelling may be 0.1 mm, 0.12 mm, 0.135 mm, 0.14 mm, 0.15 mm or other values ​​between 0.1 mm and 0.15 mm, which is not limited here.

[0106] The swelling rate m of the wire 1211 may satisfy: 300%≤m≤500%. Specifically, the diameter D3 of the wire 1211 before swelling may be 300%, 350%, 400%, 47500%, 500% or other values ​​between 300% and 500%, which is not limited here.

[0107] The cylindrical battery cell 12 provided in the present application prevents the diameter D3 of the wire 1211 from being too large, which causes the lining 121 to be too heavy and affects the energy density of the battery 10, by limiting the range of the diameter D3 of the wire 1211 when the wire 1211 is made of resin material, thereby reducing the weight of the lining 121 as much as possible to achieve an overall lightweight design, and preventing the diameter D3 of the wire 1211 from being too small, which causes the wire 1211 to be insufficiently stiff to provide sufficient supporting force and prone to brittle fracture, thereby extending the service life of the lining 121.

[0108] According to some embodiments of the present application, the present application further provides an inner liner 121 , which is applied to a cylindrical battery cell 12 , and the inner liner 121 includes a cylindrical tubular mesh structure woven with wires 1211 .

[0109] The wound battery cell 122 can be wound outside the lining 121, the lining 121 can be in the shape of a mesh, and multiple wires 1211 can be interlaced and woven into a cylindrical tubular mesh structure. The length of the lining 121 can be greater than the length of the wound battery cell 122. In other words, at least part of the lining 121 is located outside the wound battery cell 122.

[0110] The lining 121 may be made of metal, resin or other materials, which are not limited here.

[0111] In actual implementation, Figure 3-Figure 9As shown, the positive electrode sheet, the negative electrode sheet and the separator are wound to obtain a wound battery cell 122, and the cylindrical tubular mesh liner 121 is slowly inserted into the center hole from one end of the wound battery cell 122 until the end of the liner 121 entering the center hole reaches the other end of the wound battery cell 122. At this time, the liner 121 still at least partially extends out of the center hole of the wound battery cell 122 to facilitate subsequent maintenance of the liner 121. During the cycle period of the electrode assembly, as the number of cycles increases, even if the inner wall of the center hole has a tendency to collapse downward due to insufficient supporting force, the liner 121 located in the center hole can also support the center hole, thereby suppressing the collapse of the center hole from further deteriorating.

[0112] The liner 121 provided in the present application is designed with the above-mentioned cylindrical tubular mesh structure, and adopts this structure to effectively improve the problem of collapse of the center hole of the wound battery cell 122, so that the liner 121 can support the center hole of the wound battery cell 122, thereby suppressing the continuous deterioration of the collapse of the center hole during the cycle, and reducing the weight of the liner 121 at the same time, thereby improving the energy density of the cylindrical battery cell 12, and then increasing the capacity of the entire battery 10, realizing overall miniaturization and lightweight design, and there is no protruding structure on the surface of the liner 121, so as to minimize the negative impact of the liner 121's own structure on the wound battery cell 122.

[0113] According to some embodiments of the present application, the present application further provides a battery 10, and the battery 10 includes a plurality of cylindrical battery cells 12 according to any of the above schemes.

[0114] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 10 of any of the above schemes, and the battery 10 is used to provide electrical energy to the electrical device.

[0115] The electrical device may be any of the aforementioned devices or systems using the battery 10 .

[0116] According to some embodiments of the present application, Figure 3-Figure 9 As shown, the present application provides a cylindrical battery cell 12, which includes: an inner liner 121 and a wound battery cell 122. The inner liner 121 includes a cylindrical tubular mesh structure made of wires 1211; the wound battery cell 122 is wound outside the inner liner 121, the outer diameter of the inner liner 121 is smaller than the diameter of the center hole of the wound battery cell 122, and the mesh hollow hole of the inner liner 121 includes multiple edges. The inner liner 121 can be in the following two structural forms: first, the wires 1211 of the inner liner 121 are metal coated with an insulating layer; second, the wires 1211 of the inner liner 121 are swelling synthetic resins, and the cylindrical battery cell 12 also includes an electrolyte, and at least part of the inner liner 121 is immersed in the electrolyte.

[0117] Among them, the ratio D1 / D2 of the outer diameter of the lining 121 and the central hole diameter of the wound battery core 122 satisfies: 0.6≤D1 / D2≤0.85; when the wire 1211 of the lining 121 is a metal coated with an insulating layer, the diameter D3 of the wire 1211 satisfies: 0.1mm≤D3≤0.5mm; when the wire 1211 of the lining 121 is a swelling synthetic resin, the diameter D3 of the wire 1211 satisfies: 0.4mm≤D3≤0.6mm.

[0118] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0119] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cylindrical battery cell, characterized in that: include: The lining includes a cylindrical tubular mesh structure made of braided wire; The wound battery cell is wound outside the inner liner.

2. The cylindrical battery cell according to claim 1, characterized in that: The outer diameter of the liner is smaller than the diameter of the central hole of the wound battery core.

3. The cylindrical battery cell according to claim 2, characterized in that: The ratio D1 / D2 of the outer diameter of the liner to the central hole diameter of the wound battery core satisfies: 0.6≤D1 / D2≤0.

85.

4. The cylindrical battery cell according to claim 1, characterized in that: The mesh hollow holes of the lining include a plurality of edges.

5. The cylindrical battery cell according to any one of claims 1 to 4, characterized in that: The wire material of the lining is a metal coated with an insulating layer.

6. The cylindrical battery cell according to claim 5, characterized in that: The diameter D3 of the wire material satisfies: 0.1 mm ≤ D3 ≤ 0.5 mm.

7. The cylindrical battery cell according to any one of claims 1 to 4, characterized in that: At least a portion of the liner is immersed in the electrolyte of the cylindrical battery cell, and the wire material of the liner is a swelling synthetic resin.

8. The cylindrical battery cell according to claim 7, characterized in that: The diameter D3 of the wire material satisfies: 0.4mm≤D3≤0.6mm.

9. A battery, characterized in that: include: A plurality of cylindrical battery cells according to any one of claims 1 to 8.

10. An electrical device, characterized in that: include: The battery as claimed in claim 9, wherein the battery is used to provide electrical energy to the electrical device.

11. A lining, characterized in that: Applied to cylindrical battery cells, the lining includes a cylindrical tubular mesh structure woven from wires.

Images