Battery cell, battery and power-consuming device

Abstract

Battery cell, including: an outer shell comprising a first wall and an electrode connection, wherein the electrode connection is located on the first wall; an electrode arrangement arranged in the outer shell, wherein the electrode arrangement comprises an electrode connecting element, the electrode connecting element being electrically connected to the electrode terminal; and a high-temperature resistant insulating layer that is at least partially arranged between the first wall and the electrode connecting element to insulate and separate the first wall from the electrode connecting element.

Description

CROSS-REFERENCE TO RELATED REGISTRATION

[0001] This application claims priority over the Chinese patent application with application number 202420264406.X, which was filed with the Chinese Patent Office on February 2, 2024, with an invention title "Battery cell, battery and power-consuming device", the entire contents of which are incorporated into this application by reference. TECHNICAL AREA

[0002] The present application relates to the field of battery technology, in particular a battery cell, a battery and a power-consuming device. STATE OF THE ART

[0003] Energy saving and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles have become an important component of this sustainable development due to their advantages in terms of energy saving and environmental protection. Battery technology is a crucial factor in the development of electric vehicles.

[0004] A high-performance battery generally comprises battery cells. Reducing the risk of thermal runaway in battery cells is a pressing problem that needs to be solved in battery technology. CONTENT OF THE PRESENT INVENTION

[0005] Against this background, embodiments of the present application provide a battery cell, a battery and a power-consuming device that can reduce the risk of thermal runaway of the battery cell.

[0006] An embodiment of the first aspect of the present application provides a battery cell comprising the following: an outer shell comprising a first wall and an electrode connection, wherein the electrode connection is located on the first wall; an electrode arrangement arranged in the outer shell, wherein the electrode arrangement comprises an electrode connecting element, the electrode connecting element being electrically connected to the electrode terminal; and a high-temperature resistant insulating layer that is at least partially arranged between the first wall and the electrode connecting element to insulate and separate the first wall from the electrode connecting element.

[0007] The battery cell provided by embodiments of the present application comprises an outer shell, an electrode assembly, and a high-temperature-resistant insulating layer. The outer shell comprises a first wall and an electrode connection provided on the first wall. The electrode assembly comprises an electrode connection element. A high-temperature-resistant insulating layer is provided between the first wall and the electrode connection element. This high-temperature-resistant insulating layer exhibits high temperature resistance and insulating properties. During the battery cell cycle, the temperature inside the battery cell can gradually increase.The high-temperature resistant insulating layer can maintain good insulating performance in a high-temperature environment, reduce the risk of overlapping short circuits between the outer shell of the battery cell and the electrode connection element, and improve the insulating performance of the battery cell in a high-temperature environment. The embodiments provided in this application can limit thermal runaway of battery cells before the battery thermal runaway occurs, thereby reducing the risk of thermal runaway and improving the safety and reliability of the battery cells.

[0008] In some embodiments, the electrode connection element comprises a tab and an adapter piece, wherein the adapter piece comprises a connection section and a tab section which are connected to each other, the connection section being connected to the electrode connection, and the tab section being connected to the tab; wherein the high-temperature resistant insulating layer comprises a protective adhesive arranged between the adapter piece and the first wall, wherein along the thickness direction of the first wall the projection of the tab connection section and the projection of the tab lie within the projection area of ​​the protective adhesive.

[0009] By adopting the above technical solution, the protective adhesive covers the tab and the adapter piece, and the protective adhesive does not melt as easily, thus significantly reducing the risk of a short circuit due to direct contact between the adapter piece and / or the tab and the outer shell, thereby reducing the risk of thermal runaway due to a short circuit.

[0010] In some embodiments, it is provided that the adapter piece has several tab connection sections, wherein the several tab connection sections are arranged along the width direction of the adapter piece, wherein the connecting connection section is provided between two adjacent tab connection sections; wherein the protective adhesive comprises several adhesive films, wherein the several adhesive films are each assigned to the several tab connection sections.

[0011] By adopting the above technical solution, several adhesive films are provided spaced apart, thereby reducing the overall size of the high-temperature resistant insulating layer and allowing each adhesive film to be easily glued to the adapter piece; therefore, the gluing method of the high-temperature resistant insulating layer is simple and easy to implement.

[0012] In some embodiments, the length of the adhesive film is greater than or equal to the length of the adapter piece, with the width of the adhesive film being greater than or equal to the width of the tab connection section.

[0013] The adhesive film, which meets the above-mentioned size requirements, can cover the tab connection section of the adapter piece, effectively separate the adapter piece from the outer shell, and reduce the risk of a short circuit due to contact between the tab connection section and the outer shell.

[0014] In some embodiments, the tab is provided to comprise several stacked tab leaves; wherein, along the longitudinal direction of the adapter piece, the difference between the length of the adhesive film and the width of the tab leaf is 12 mm to 14 mm.

[0015] In some embodiments, the width of the adhesive film is provided for as follows: W3≥[H+(Wl-W2)]*2; where W1 is the width of the tab connection section, W2 is the width of the overlap area between the tab connection section and the tab, W3 is the width of the adhesive film, and H is the height of the tab.

[0016] By applying the above technical solution, part of the adhesive film will be in contact with the electrode connection element and the other part will be bent and in contact with the side of the electrode assembly, thereby not only increasing the adhesive effect, but the adhesive film can also serve as insulation between the side of the electrode assembly and the outer shell; in addition, the adhesive film can cover the tab connection section and the tab of the adapter piece along the width direction, thereby improving the insulating effect.

[0017] In some embodiments, the width of the adhesive film is designed to meet the following requirements: W3=[H+(W1−W2)+2mm]*2.

[0018] By adopting the above technical solution, the adhesive film can cover the tab connection section and the tab of the adapter piece along the width direction within the permissible range of the manufacturing tolerance, thereby further improving the insulation reliability.

[0019] In some embodiments, the difference between the length of the adhesive film and the length of the adapter piece is provided to be 1 mm and 3 mm; and / or The difference between the width of the adhesive film and the width of the tab connection section is 10 mm to 15 mm.

[0020] By adopting the above technical solution, the size of the adhesive film is appropriate so that it can cover the tab connection section and the tab of the adapter piece in both width and length directions, while avoiding excessive size that wastes costs and space.

[0021] In some embodiments, the thickness of the protective adhesive is specified as being between 0.1 mm and 0.5 mm.

[0022] By adjusting the thickness of the protective adhesive to the aforementioned range, the protective adhesive has better high-temperature resistance and insulating performance, and the protective adhesive does not take up too much space in the outer shell due to its excessive thickness.

[0023] In some embodiments, the thickness of the protective adhesive is specified as 0.1 mm to 0.3 mm. This gives the protective adhesive good flexural properties, which facilitates its adhesion to the electrode assembly.

[0024] In some embodiments, the melting point of the protective adhesive is specified as being between 320°C and 500°C.

[0025] The protective adhesive provided by embodiments of the present application has a relatively high melting point, which reduces the risk of the protective adhesive melting due to the excessive temperature of the electrode arrangement and causing a short circuit between the electrode connection element and the outer shell, thereby reducing the risk of thermal runaway.

[0026] In some embodiments, the melting point of the protective adhesive is provided to be above 350°C and less than or equal to 500°C.

[0027] In some embodiments, the protective adhesive is provided to be a PI adhesive tape or a Teflon adhesive tape.

[0028] By applying the above technical solution, the protective adhesive exhibits good high-temperature resistance and insulating performance, and has good chemical stability, water resistance, moisture resistance, aging resistance, corrosion resistance and other advantages, and is suitable for lithium battery systems.

[0029] In some embodiments, the outer shell comprises an end cap and a housing, wherein the end cap forms the first wall and covers the housing, wherein a plastic part is provided on a side of the end cap facing the housing, the plastic part being used to separate the end cap from the electrode arrangement; wherein the high-temperature resistant insulating layer comprises an insulating coating between the end cap and the plastic part, wherein the heat resistance temperature of the insulating coating is above the melting point of the plastic part.

[0030] In embodiments of the present application, an insulating coating is provided between the end cap and the plastic part, which can reduce the risk of the plastic part melting in a high-temperature environment and the electrode connection element coming into direct contact with the end cap, i.e., reducing the risk of a short circuit between the electrode connection element and the outer shell. This reduces the risk of thermal runaway due to internal short circuits in battery cells and improves the safety and reliability of battery cells.

[0031] In some embodiments, the insulating coating is provided on a surface of the end cap facing the housing and does not cover the electrode connection.

[0032] The insulating coating mentioned above is provided on the end cap, is easy to manufacture, exhibits uniform film formation and can provide good insulation between the end cap and the electrode assembly.

[0033] In some embodiments, the projection of the electrode connection element along the thickness direction of the first wall is located within the projection area of ​​the insulating coating.

[0034] In some embodiments, the heat resistance temperature of the insulating coating is specified as being between 400°C and 1000°C.

[0035] The insulating coating exhibits high heat resistance. Even if the battery cell temperature gradually rises and thermal runaway occurs, the insulating coating can maintain its chemical properties for an extended period. The insulating coating can separate the end cap from the electrode assembly. The insulating coating described above can be applied to lithium battery systems.

[0036] In some embodiments, the insulating coating material comprises an organic polymer or a metal oxide, wherein the organic polymer comprises one of polytetrafluoroethylene, polyethylene, polypropylene, polyethylene terephthalate and polyimide, and wherein the metal oxide comprises one of aluminium oxide, aluminium hydroxide, titanium dioxide and magnesium oxide.

[0037] By adopting the above technical solution, the insulating coating produced from the above-mentioned material exhibits good insulating performance and high temperature resistance.

[0038] In some embodiments, the thickness of the insulating coating is specified as being between 0.05 mm and 0.15 mm.

[0039] By adopting the above technical solution, the thickness of the insulating coating does not significantly increase the thickness of the end cap and can provide a better protective function.

[0040] In some embodiments, the battery cell also includes a high-temperature resistant protective film, wherein the high-temperature resistant protective film covers at least part of the outer shell, and wherein the melting point of the high-temperature resistant protective film is greater than or equal to 500°C.

[0041] The melting point of the high-temperature resistant protective film is greater than or equal to 500°C. When the electrode assembly is charged and discharged with a high current, or when thermal runaway occurs, causing a temperature increase, the high-temperature resistant protective film on the surface of the electrode assembly does not melt. This reduces heat transfer between battery cells in the module, lowers the temperature of adjacent battery cells, reduces the risk of heat spread, and further improves safety.

[0042] In some embodiments, the material of the high-temperature resistant protective film includes a PI adhesive.

[0043] Since PI adhesive has good heat resistance, the high-temperature resistant protective film has significantly improved resistance compared to the conventional blue film.

[0044] In some embodiments, the thickness of the high-temperature resistant protective film is 0.15 mm to 0.25 mm.

[0045] By adopting the above technical solution, the high-temperature resistant protective film can not only provide good protection for the battery cells, but also avoid taking up too much space in the module.

[0046] An embodiment of the second aspect of the present application provides a battery comprising the battery cell provided in the first aspect.

[0047] An embodiment of the third aspect of the present application provides a power-consuming device comprising the battery provided in the second aspect.

[0048] The above description merely provides an overview of the technical solution of the present application. To better understand the technical means of the present application, it can be implemented according to the details in the description. To make the aforementioned and further purposes, features, and advantages of the present application clearer and more understandable, the specific implementations of the present application are also listed below. BRIEF DESCRIPTION OF THE DRAWING

[0049] To clarify the technical solutions of the embodiments of the present application, the drawings required for the descriptions in embodiments or in ordinary technology are briefly described below. Obviously, the accompanying drawings in the following description represent only some embodiments of the present application, and other drawings can be derived from these drawings without any creative effort by the person skilled in the art. Fig. Figure 1 is a schematic structural representation of a vehicle that is provided in some embodiments of the present application; Fig. Figure 2 is a schematic structural representation of a battery, which is provided by some embodiments of the present application; Fig. Figure 3 is a schematic structural representation of a battery cell, which is provided by some embodiments of the present application; Fig. Figure 4 is a schematic structural representation of an electrode arrangement provided by some embodiments of the present application; Fig. Figure 5 is a schematic structural representation of an electrode arrangement and a high-temperature resistant insulating layer, which are provided in some embodiments of the present application; Fig. Figure 6 is a schematic structural representation of a high-temperature resistant insulating layer, which is provided in some embodiments of the present application, on an end cap; Fig. Figure 7 is a schematic structural representation of a first wall, which is provided by some embodiments of the present application.

[0050] The meanings of the markings in the figures are as follows: 1000. Vehicle; 100. Battery; 200. Control unit; 300. Motor; 10. Box; 11. First part; 12. Second part; 20. Battery cell; 21. Outer shell; 211. First wall; 2113. Electrode extraction hole; 212. Electrode terminal; 213. Housing; 214. Plastic part; 215. Top patch; 22. Electrode assembly; 221. Electrode connecting element; 2211. Tab; 22111. Tab blade; 2211a. Cathode tab; 2211b. Anode tab; 2212. Adapter piece; 2212a. Terminal connection section; 2212b. Tab connection section; 222. Main body; 223. Insulating plate; 23. High-temperature resistant insulating layer; 231. Protective adhesive; 2311. Adhesive film; 232. Insulating coating; 24. High-temperature resistant protective film. DETAILED DESCRIPTION

[0051] Exemplary embodiments of the technical solutions of the present application are described in detail below in conjunction with the accompanying drawings. The following exemplary embodiments serve only to illustrate the technical solutions of the present application more clearly; they are therefore merely examples and should not be used to limit the scope of protection of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as they would be generally understood by a person skilled in the technical field of the present application; the terminology used herein serves only to describe specific embodiments and is not intended to limit the present application; the terms "comprise" and "include" and all variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0053] In the description of the embodiments of this application, technical terms such as "first" and "second" and the like are used only to distinguish different objects and cannot be understood as indicating or implying a relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the technical features mentioned. In the description of the embodiments of this application, "several" means more than two, unless expressly and specifically stated otherwise.

[0054] The reference herein to an “embodiment” means that a particular feature, structure, or property described in connection with the embodiment may be included in at least one embodiment of the present application. The occurrence of this phrase at various points in the description does not necessarily all refer to the same embodiment, nor is it an independent or alternative embodiment that mutually excludes other embodiments. It is expressly and implicitly clear to those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0055] In the description of embodiments of the present application, the term "and / or" merely describes the associative relationship between linked objects and indicates that three relationships are possible; for example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the symbol " / " in this article generally indicates that the preceding and next associated objects are in an "or" relationship.

[0056] In the description of embodiments of the present application, the term “several” refers to more than two (including two), likewise “several groups” refers to more than two groups (including two groups) and “several pieces” refers to more than two pieces (including two pieces).

[0057] In describing the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "middle", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "in front", "behind", "vertical", "horizontal", "roof", "bottom", "inside", "outside" and the like are the orientations or positional relationships shown based on the drawings and serve only for the convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the device or element in question must have a particular orientation or orientation or be designed and operated in a particular orientation, and should therefore not be construed as limiting the embodiments of the present application.

[0058] In describing the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the technical terms "assembly", "connection", "connection", "fastening" and similar terms are to be understood broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may also refer to a mechanical or electrical connection; they may refer to a direct connection or an indirect connection via an interposed medium; and they may refer to internal communication between two elements or to an interaction between two elements. The person skilled in the art in this field will be able to understand the specific meanings of the foregoing terms in the embodiments of the present application according to specific situations.

[0059] The safety of lithium batteries has always been a research focus. The safety risks associated with lithium batteries primarily arise from uncontrolled heat generation caused by internal / external short circuits in the battery cells due to overcharging, misuse, external heating, physical collisions, internal defects, and similar factors. This ultimately leads to heat propagation within the battery cells and can even result in fires and explosions, leading to safety incidents. Most thermal runaway events are attributable to internal short circuits.Following a local internal short circuit, the battery cell discharges rapidly and the temperature rises, causing the separator to shrink or melt, which further increases the risk of a short circuit. The battery temperature rises rapidly, accompanied by chain reactions such as electrolyte decomposition and material decomposition, and finally the battery catches fire and explodes.

[0060] In light of this, the present application provides a battery cell that can reduce the risk of an internal short circuit within the battery cell, thereby reducing the risk of thermal runaway and the risk of heat dissipation between battery cells. The battery cell provided by embodiments of the present application comprises an outer shell, an electrode assembly, and a high-temperature-resistant insulating layer. The first wall of the outer shell is provided with an electrode terminal, the electrode assembly is provided with an electrode connection element, and the high-temperature-resistant insulating layer is located between the first wall and the electrode connection element. The high-temperature-resistant insulating layer exhibits high temperature resistance and insulating properties.As the temperature inside the battery cell rises, the high-temperature resistant insulating layer can continue to insulate the outer shell from the electrode connection element, thus reducing the risk of a short circuit between the outer shell and the electrode connection element. This reduces the risk of thermal runaway due to an internal short circuit of the battery cell and the risk of burning or even explosion of the battery cell.

[0061] The battery cell provided by embodiments of the present application can be used in a power-consuming device that uses the battery as a power source. The power-consuming device may be, for example, a mobile phone, tablet, laptop, electric toy, power tool, electric motorcycle, electric vehicle, ship, spacecraft, or the like, but is not limited to such devices. Electric toys include, for example, stationary or mobile electric toys such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and so on. Spacecraft include, for example, airplanes, rockets, spacecraft, and other space vehicles.

[0062] For the sake of simplicity, the following embodiments are described using a vehicle 1000 as an example of a power-consuming device according to an embodiment of the present application.

[0063] With reference to Fig. 1, is Fig. Figure 1 is a schematic structural representation of a vehicle 1000, which is provided by some embodiments of the present application. The vehicle 1000 can be a fuel-powered vehicle, a gas-powered vehicle, or a new energy source vehicle, and the new energy source vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, or the like. A battery 100 is arranged in the vehicle 1000; the battery 1000 can be arranged at the bottom, at the front, or at the rear of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can serve as the operating current source for the vehicle 1000.The vehicle 1000 can further include a control unit 200 and a motor 300; the control unit 200 is used to control the battery 100 and to supply power to the motor 300, for example to meet the power requirements of the vehicle 1000 when starting, navigating and driving.

[0064] In some embodiments of the present application, the battery 100 can serve not only as an operating current source for the vehicle 1000, but also as a propulsion current source for the vehicle 1000, replacing fuel or natural gas wholly or partially to provide propulsion power for the vehicle 1000.

[0065] With reference to Fig. 2, is Fig. 2 An exploded view of a battery 100, which is provided in some embodiments of the present application. In some embodiments, the battery 100 comprises a box 10 and a battery cell 20, the battery cell 20 being contained in the box 10.

[0066] The box 10 is used to provide a receiving space for the battery cell, and the box 10 can assume various structures. In some embodiments, the box 10 can comprise a first part 11 and a second part 12, the first part 11 and the second part 12 overlapping each other. The first part 11 and the second part 12 together define a receiving space for a battery cell. The second part 12 can be a hollow structure with an open end; the first part 11 can be a plate-shaped structure, with the first part 11 covering the open side of the second part 12, so that the first part 11 and the second part 12 together define a receiving space; the first part 11 and the second part 12 can also be hollow structures with one open side, with the open side of the first part 11 covering the open side of the second part 12.Naturally, the box formed from the first part 11 and the second part 12 can have 10 different shapes, for example, a circular cylinder, a cuboid, or the like.

[0067] The battery 100 can contain several battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that several battery cells 20 are connected in both series and parallel. The several battery cells 20 can be directly connected to each other in series, parallel, or a mixed configuration, and then the entire assembly consisting of the several battery cells 20 is housed in the box 10. Of course, the battery 100 can also be a battery module formed from several battery cells 20 that are first connected in series, parallel, or a mixed configuration, and then several battery modules can be connected in series, parallel, or a mixed configuration to form a whole and housed in the box 10. The battery 100 can also include other structures.For example, the battery 100 can also include a bus component for establishing an electrical connection between the multiple battery cells 20.

[0068] Each battery cell 20 can 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 to these. The battery cell 20 can be in the form of a circular cylinder, a flat body, a cuboid, or other shapes.

[0069] An embodiment of the first aspect of the present application provides a battery cell 20. As in Fig. As shown in Figures 3 to 5, the battery cell 20 comprises an outer shell 21, an electrode assembly 22, and a high-temperature-resistant insulating layer 23. The outer shell 21 comprises a first wall 211 and an electrode terminal 212. The electrode terminal 212 is arranged on the first wall 211. The electrode assembly 22 is arranged in the outer shell 21. The electrode assembly 22 comprises an electrode connection element 221, and the electrode connection element 221 is electrically connected to the electrode terminal 212. The high-temperature-resistant insulating layer 23 is arranged between the first wall 211 and the electrode connection element 221 to insulate and separate the first wall 211 from the electrode connection element 221.

[0070] The outer shell 21 is an element for forming an internal environment of the battery cell 20. This internal environment, formed by the outer shell 21, can be used to house the electrode assembly 22, the electrolyte solution, and other components. The outer shell 21 can comprise a housing 213 with an open end and an end cap covering the housing 213, or it can be an integrally formed structure. The outer shell 21 can have various shapes and sizes, such as a cuboid, a circular cylindrical shape, a hexagonal prism, and the like. Specifically, the shape of the outer shell 21 can be determined according to the specific shape and size of the electrode assembly 22. The outer shell 21 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like.An electrode vent hole 2113 is arranged on the first wall 211 of the outer shell 21. The first wall 211 with the electrode vent hole 2113 can be located on the side, top, or bottom of the outer shell 21. The electrode vent hole 2113 serves for mounting the electrode connection 212. The electrode vent hole 2113 can be a circular through-hole or a through-hole with other shapes.

[0071] The electrode assembly 22 is a component in the battery cell 20 in which electrochemical reactions take place. One or more electrode assemblies 22 can be contained in the outer shell 21. The electrode assembly 22 is mainly formed by winding or stacking a cathode foil and an anode foil, and a separator is usually provided between the cathode foil and the anode foil. The portions of the cathode foil and the anode foil containing active substance form the main body of the electrode assembly 22, and the portions of the cathode foil and the anode foil that do not contain active substance each form a tab 2211.

[0072] The electrode connection element 221 in embodiments of the present application comprises at least one tab 2211. In some embodiments, the electrode connection element 221 may also include other elements that are electrically connected between the tab 2211 and the electrode terminal 212. For example, the electrode connection element 221 comprises the tab 2211 and the adapter piece 2212, and the adapter piece 2212 is welded to both the tab 2211 and the electrode terminal 212. During the charging and discharging process of the battery cell 20, the active cathode substance and the active anode substance react with the electrolyte solution, and the electrode connection element 221 connects to the electrode terminal 212 to form a current loop.

[0073] The electrode connection 212 is inserted into the electrode extraction hole 2113. The electrode connection 212 serves for electrical connection to an external electrical element and is also used for electrical connection to the electrode connecting element 221. In embodiments of the present application, the electrode connection 212 can be an anode connection or a cathode connection.

[0074] The high-temperature resistant insulating layer 23 is arranged between the first wall 211 and the electrode connection element 221; the high-temperature resistant insulating layer 23 serves to insulate the first wall 211 from the electrode connection element 221.The high-temperature resistant insulating layer 23 exhibits the properties of high temperature resistance and insulation; the heat resistance temperature of the high-temperature resistant insulating layer 23 is relatively high, so that the insulating performance of the high-temperature resistant insulating layer 23 can be maintained for a long time in a high-temperature environment; the insulating performance of the high-temperature resistant insulating layer 23 is not easily lost when the battery cell 20 is in a high-temperature environment, thereby reducing the risk of a short circuit between the outer shell 21 of the battery cell 20 and the electrode connection element 221 and improving the insulating performance of the battery cell 20 in a high-temperature environment.

[0075] The high-temperature-resistant insulating layer 23 can be provided on a surface of the first wall 211 facing the electrode arrangement 22, or it can be provided on a surface of the electrode connection element 221 facing the first wall 211. The material of the high-temperature-resistant insulating layer 23 can be an inorganic material, an organic material, or a mixture of an inorganic and an organic material. It should be noted that, regardless of the material of which it is composed, the high-temperature-resistant insulating layer 23 can consist of a high-temperature-resistant insulating material commonly used in the industry.

[0076] The battery cell 20 provided by embodiments of the present application comprises an outer shell 21, an electrode arrangement 22 and a high-temperature resistant insulating layer 23, the outer shell 21 comprises a first wall 211, wherein an electrode connection 212 is provided on the first wall 211, the electrode arrangement 22 has an electrode connection element 221, and the high-temperature resistant insulating layer is provided between the first wall 211 and the electrode connection element 221, and the high-temperature resistant insulating layer has high temperature resistance and insulating properties.During the cycle of the battery cell 20, the temperature inside the battery cell 20 can gradually increase. The high-temperature resistant insulating layer can maintain good insulation performance in a high-temperature environment, reducing the risk of overlapping short circuits between the outer shell 21 of the battery cell 20 and the electrode connection element 221, and improving the insulation performance of the battery cell 20 in a high-temperature environment. This reduces the risk of thermal runaway, improves the safety and reliability of the battery cells 20, and reduces the risk of heat propagation between the battery cells 20.

[0077] In some embodiments, the heat resistance temperature of the high-temperature resistant insulating layer is provided for to be above 300°C.

[0078] The heat resistance temperature is a term from materials science that refers to the temperature at which a material can retain its properties unchanged at high temperatures. The heat resistance temperatures of different materials vary depending on factors such as composition, structure, and manufacturing process. At high temperatures, some materials undergo chemical reactions, decompose, oxidize, or melt, and lose their original properties. Therefore, the heat resistance temperature is one of the most important indicators for measuring the performance of materials at high temperatures. The heat resistance temperature of the high-temperature-resistant insulating layer provided by embodiments of the present application is above 300°C.If the battery cell 20 gradually heats up during the cyclic use process, the high-temperature resistant insulating layer can maintain the insulating performance for a longer period of time, thereby reducing the risk of a short circuit between the electrode arrangement 22 and the outer shell 21 and improving the safety of the battery cell 20.

[0079] With reference to Fig. 3 to Fig. In some embodiments, the electrode connection element 221 comprises a tab 2211 and an adapter piece 2212; the adapter piece 2212 is connected between the tab 2211 and the electrode terminal 212; the adapter piece 2212 comprises a connection section 2212a, which is connected to the electrode terminal 212, and a tab connection section 2212b, which is connected to the tab 2211; the high-temperature resistant insulating layer 23 comprises a protective adhesive 231, which is arranged between the adapter piece 2212 and the first wall 211. Along the thickness direction of the first wall 211, the projection of the tab connection section 2212b and the projection of the tab 2211 lie within the projection area of ​​the protective adhesive 231. The tab connection section 2212b and the tab 2211 are covered with the protective adhesive 231, while the connecting section 2212a is not covered with the protective adhesive 231.

[0080] Specifically, the electrode assembly 22 comprises a main body 222 and an electrode connection element 221. The electrode connection element 221 includes a tab 2211 and an adapter piece 2212. The tab 2211 extends from one end of the main body facing the first wall 211. The main body 222 is the core component of the electrode assembly 22 for performing the charging and discharging functions, and the tab 2211 serves to conduct the current generated by the main body. The main body comprises a cathode current collector section of a cathode current collector, an active cathode substance layer, an anode current collector section of an anode current collector, an active anode substance layer, and an insulating element.There can be two tabs 2211, namely a cathode tab 2211a and an anode tab 2211b, the cathode tab 2211a and the anode tab 2211b can be brought out from the same end of the electrode arrangement 22 or from opposite ends of the electrode arrangement 22.

[0081] The number of electrode arrangements 22 incorporated in the outer shell 21 can be one or more. For example, in Fig. 3 two electrode arrangements 22, each of the electrode arrangements 22 has a cathode tab 2211a and an anode tab 2211b, one adapter piece 2212 connects the two cathode tabs 2211a and the other adapter piece 2212 connects the two anode tabs 2211b.

[0082] The adapter piece 2212 is located on the side of the tab 2211 facing the first wall 211. The adapter piece 2212 serves to electrically connect the electrode terminal 212 to the tab 2211. The adapter piece 2212 comprises a connection section 2212a, which is connected to the electrode terminal 212, and a tab connection section 2212b, which is connected to the tab 2211. The tab connection section 2212b is covered with the protective adhesive 231 to reduce the risk of the tab 2211 and the tab connection section 2212b contacting the outer shell 21. The connection section 2212a is not covered by the protective adhesive 231, so that the high-temperature-resistant insulating layer 23 does not impair the connection between the adapter piece 2212 and the electrode terminal 212.

[0083] The tab 2211 is also covered with the protective adhesive 231, whereby the part of the tab 2211 covered by the tab connection section 2212b must be covered with the protective adhesive 231; the part of the tab 2211 not covered by the protective adhesive 231 may also be covered by the protective adhesive 231. It is understood that the protective adhesive 231 may completely cover the tab 2211 to reduce the risk of a short circuit.

[0084] To conduct the current generated by the main body of the electrode assembly 22, the adapter piece 2212 is electrically conductive. The protective adhesive 231 is arranged between the adapter piece 2212 and the first wall 211. The high-temperature-resistant insulating layer 23 can be attached to the adapter piece 2212 or to the first wall 211, or a protective adhesive 231 can be applied to both the adapter piece 2212 and the first wall 211. The protective adhesive 231 is a high-temperature-resistant adhesive and can be made of various materials, for example, PI adhesive.

[0085] By adopting the above technical solution, the high-temperature-resistant insulating layer 23 includes a protective adhesive 231, which is provided between the adapter piece 2212 and the first wall 211, and the protective adhesive 231 covers the tab 2211 and the adapter piece 2212. If the temperature of the electrode assembly 22 is too high, the protective adhesive 231 does not melt as easily, which significantly reduces the risk of a short circuit due to direct contact between the adapter piece 2212 and / or the tab 2211 and the outer shell 21, thereby reducing the risk of thermal runaway due to a short circuit.

[0086] In some embodiments, the adapter piece 2212 has several tab connection sections 2212b, wherein the multiple tab connection sections 2212b are arranged along the width direction of the adapter piece 2212, and the connecting connection section 2212a is arranged between two adjacent tab connection sections 2212b. The protective adhesive 231 comprises several adhesive films 2311, and the multiple adhesive films 2311 are each associated with one of the multiple tab connection sections 2212b.

[0087] With reference to Fig. 5 There are several tabs 2211, the adapter piece 2212 is provided with two tab connection sections 2212b along its width direction, and the connecting connection section 2212a is provided between the two tab connection sections 2212b, and each tab connection section 2212b is used to connect to a corresponding tab 2211; the protective adhesive 231 comprises several spaced-apart adhesive films 2311, and the adhesive films 2311 are arranged to each of the tab connection sections 2212b and to each of the tabs 2211 in order to cover the corresponding tab connection sections 2212b and the corresponding tabs 2211.

[0088] For example, the outer shell 21 has four tabs 2211, and the four tabs 2211 comprise two cathode tabs 2211a and two anode tabs 2211b. The number of electrode connections 212 and the number of adapter pieces 2212 is each two. The two tab connection sections 2212b of one adapter piece 2212 are each connected to the two cathode tabs 2211a, and the two tab connection sections 2212b of the other adapter piece 2212 are each connected to the two anode tabs 2211b. The high-temperature-resistant insulating layer 23 comprises four adhesive films 2311, each assigned to one of the four tab connection sections 2212b and one of the four tabs 2211.

[0089] By applying the technical solution described above, several adhesive films 2311 are provided spaced apart, thereby reducing the overall size of the high-temperature resistant insulating layer 23. Each adhesive film 2311 can be easily glued to the adapter piece 2212, making the bonding method of the high-temperature resistant insulating layer 23 simple and easy to implement.

[0090] It is understood that in other embodiments, adjacent adhesive films 2311 may also be connected to each other, for example, the protective adhesive 231 is an integral structure that covers both adapter pieces 2212 simultaneously, and wherein the protective adhesive 231 is provided with a through-hole to expose the connection section 2212a; in another example, the protective adhesive 231 comprises two spaced-apart adhesive films 2311, each adhesive film 2311 covering an adapter piece 2212 and provided with a through-hole to expose the connection section 2212a.

[0091] In some embodiments, the length of the adhesive film 2311 is greater than or equal to the length of the adapter piece 2212, and the width of the adhesive film 2311 is greater than or equal to the width of the tab connection section 2212b. The adhesive film 2311 can cover the tab connection section 2212b and the edge of the main body 222; the portion of the adhesive film 2311 extending beyond the tab can be bent and adhered to the main body 222.

[0092] The adhesive film 2311, which meets the above-mentioned size requirements, can cover the tab connection section 2212b of the adapter piece 2212, thereby effectively separating the adapter piece 2212 from the outer shell 21 and reducing the risk of a short circuit due to contact between the tab connection section 2212b and the outer shell 21.

[0093] With reference to Fig. 3 to Fig. In some embodiments, the tab 2211 comprises several stacked tab leaves 22111. L1 in Fig. 4 represents the width of the tab leaf 22111 and L2 in Fig. Figure 5 represents the length of the adhesive film 2311. Along the longitudinal direction of the adapter piece 2212, the difference between the length L2 of the adhesive film 2311 and the width L1 of the tab plate 22111 is 12 mm to 14 mm, i.e. 12mm≤L2−L1≤14mm.

[0094] Since each tab 2211 comprises several stacked tab leaves 22111, misalignment of the tab leaves 22111 can occur. Taking the tolerance into account, the length of the adhesive film 2311 meets the above-mentioned size requirements, so that the adhesive film 2311 can cover each tab leaf 22111, and the adhesive film 2311 can insulate the adapter piece 2212 / tab 22111 and the first wall 211 along the longitudinal direction of the adapter piece 2212.

[0095] With reference to Fig. 3 to 5, one end of the tab 2211 extends from the main body 222, and the other end of the tab 2211 is connected to the adapter piece 2212. The tab 2211 and the tab connection section 2212b are stacked. The tab 2211 can be located on either side of the tab connection section 2212b facing the first wall or on either side of the tab connection section 2212b facing away from the first wall 211. To improve the insulating effect, the adhesive film 2311 can cover the opposite ends of the tab 2211. The tab connection section 2212b has an area that overlaps with the tab 2211, and the tab connection section 2212b also has an area that does not overlap with the tab 2211. To improve the insulating effect, the adhesive film 2311 can cover the tab connection section 2212b.The adhesive film 2311 can effectively prevent short circuits caused by the overlap of the areas of the tab 2211 and the adapter piece 2212 with the exception of the connecting section 2212a with the housing 21.

[0096] In some embodiments, the width of the adhesive film 2311 fulfills the following: W3≥[H+(W1−W2)]*2; where W1 is the width of the tab connection section 2212b, W2 is the width of the overlap area between the tab connection section 2212b and the tab 2211, W3 is the width of the adhesive film 2311, and H is the height of the tab 2211. The difference between W1 and W2 represents the width of the area where the tab connection section 2212b does not overlap with the tab 2211, i.e., the width between the connecting section 2212a and the tab 2211. The area where the tab connection section 2212b does not overlap with the tab 2211 can be covered by the adhesive film 2311. Furthermore, “H + (W1 - W2)” represents the sum of the height of the tab 2211 and the width of the area in which the tab connection section 2212b does not overlap with the tab 2211, and can also be understood as the distance from the connecting connection section 2212a to the root of the tab 2211.Simultaneously, half of the adhesive film 2311 lies along its width direction at the tab 2111 and the adapter piece 2212, and the other half lies at the side of the electrode arrangement 22, such that W3 ≥ [H + (W1 - W2)] * 2. Furthermore, W4 is in . Fig. 4 the width of the adapter piece 2212.

[0097] The width W1 of the tab connection section 2212b is the distance from the connecting connection section 2212a to the edge of the adapter piece 2212 in the width direction. If the connecting connection section 2212a is a projection, W1 is the distance from the projection to the edge of the adapter piece 2212 along the width direction of the adapter piece 2212.

[0098] By applying the above technical solution, part of the adhesive film 2311 will be in contact with the electrode connection element 221, and the other part will be bent and in contact with the side of the electrode arrangement 22. This not only increases the adhesive effect, but the adhesive film 2311 can also serve as insulation between the side of the electrode arrangement 22 and the outer shell 21. In addition, the adhesive film 2311 can cover the tab connection section 2212b of the adapter piece 2212 and the tab 2211 along its width direction, thus providing better insulation.

[0099] In some embodiments, the width of the adhesive film fulfills the following criteria: W3=[H+(W1−W2)+2mm]*2.

[0100] Here, 2 mm is the tolerance value, taking manufacturing tolerances into account. In the event of a deviation in the adhesive position of the adhesive film 2311 or a deviation in the width dimension of the adhesive film 2311, the adhesive film 2311 can still separate the electrode connection element 221 from the first wall 211. By implementing the aforementioned technical solution, the insulation reliability of the adhesive film 2311 is further improved.

[0101] In some embodiments, the thickness of the protective adhesive 231 is specified as being between 0.1 mm and 0.5 mm. For example, the thickness of the protective adhesive 231 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or the like. By adjusting the thickness of the protective adhesive 231 to the aforementioned range, the protective adhesive 231 exhibits good high-temperature resistance and insulating performance, and its excessive thickness prevents the protective adhesive 231 from occupying too much space within the outer shell 21.

[0102] In some embodiments, the thickness of the protective adhesive 231 is 0.1 mm to 0.3 mm. This gives the protective adhesive 231 good flexural properties, which facilitates its adhesion to the electrode arrangement 22.

[0103] In some embodiments, the protective adhesive 231 is provided to be a polyimide (PI) adhesive tape or a Teflon adhesive tape.

[0104] PI tape is a high-temperature resistant adhesive tape whose material contains PI. The base material of a PI tape is typically a polyimide film with an adhesive layer applied to it. PI tape is resistant to high and low temperatures, acids and alkalis, solvents, and electrical insulation, and offers other performance characteristics. In some embodiments, the melting point of PI tape can reach 375°C; the melting point is the temperature at which a solid transitions from a solid to a liquid state (melts).

[0105] Teflon tape is a high-temperature resistant adhesive tape made of Teflon. Typically, Teflon tape uses fiberglass as the base fabric, which is coated with a Teflon solution and dried to create a Teflon-glass fiber fabric. This is then coated a second time with silicone adhesive. Teflon tape is characterized by high strength, high temperature resistance, a smooth surface, and resistance to chemical corrosion. It also offers good electrical insulation, stability, and durability. In some embodiments, the melting point of Teflon tape can reach 375°C.

[0106] By applying the above technical solution, the protective adhesive 231 is a PI adhesive tape or a Teflon adhesive tape. The protective adhesive 231 exhibits good high-temperature resistance and insulating performance, as well as good chemical stability, water resistance, moisture resistance, aging resistance, corrosion resistance, and other advantages, making it suitable for lithium battery systems. If the temperature of the electrode assembly 22 is too high, the protective adhesive 231 does not melt as easily, thus reducing the risk of a short circuit due to direct contact between the adapter piece 2212 and / or the tab 2211 and the outer shell 21, thereby reducing the risk of thermal runaway due to a short circuit. It is understood that the protective adhesive 231 can also be made of other high-temperature-resistant and insulating materials.

[0107] In some embodiments, the melting point of the protective adhesive 231 is provided to be between 320°C and 500°C.

[0108] Using PI adhesive tape as an example, the melting point of PI adhesive tape is related to the density of PI; the melting point of PI adhesive tape can range from 200°C to 500°C. To improve the temperature resistance of the protective adhesive 231, the melting point of the PI adhesive selected in embodiments of the present application can be 320°C to 500°C, for example, 320°C, 375°C, 400°C, 500°C, or the like. Using Teflon adhesive tape as an example, the melting point of Teflon adhesive tape can reach 327°C, 375°C, or the like. It is understood that the protective adhesive 231 can also consist of other materials or a mixture, including PI or Teflon, and that the melting point of the protective adhesive 231 is also in the range of 320°C to 500°C.

[0109] The protective adhesive 231 provided by embodiments of the present application has a relatively high melting point, which reduces the risk that the protective adhesive 231 melts due to the excessive temperature of the electrode arrangement 22 and causes a short circuit between the electrode connection element 221 and the outer shell 21, thereby reducing the risk of thermal runaway.

[0110] In some embodiments, the melting point of the protective adhesive 231 is provided to be above 350°C and less than or equal to 500°C. For example, the melting point of the protective adhesive 231 can be 360°C, 400°C, 450°C, 500°C, or the like.

[0111] By applying the above technical solution, the protective adhesive 231 used in embodiments of the present application has a high melting point. Even with rising temperature in the battery cell 20 or thermal runaway, the protective adhesive 231 does not melt, thereby reducing the risk of a short circuit between the electrode connection element 221 and the first wall 211 as well as the risk of heat propagation.

[0112] With reference to Fig. 3, Fig. 6 and Fig. In some embodiments, the outer shell 21 comprises an end cap and a housing 213. The end cap forms a first wall 211 and covers the housing 213. A plastic part 214 is provided on the side of the end cap facing the housing 213. The plastic part 214 serves to separate the end cap from the electrode arrangement 22. The high-temperature-resistant insulating layer 23 comprises an insulating coating 232 between the end cap and the plastic part 214. The heat resistance temperature of the insulating coating 232 is above the melting point of the plastic part 214.

[0113] For example, in Fig. 3. The housing 213 has a cuboid structure, and the end cap is a plate-shaped structure that covers and closes the opening on the top of the housing 213. In other embodiments, the housing 213 can also be circular or cylindrical, or have other shapes, and the end cap is adapted to the shape of the housing 213. The plastic part 214 is attached to the side of the end cap facing the housing 213. The plastic part 214 has insulating properties and can insulate the end cap from the electrode assembly 22. Since the electrode connecting element 221 must be connected to the electrode terminal 212, it is understandable that a through-hole is provided in the plastic part 214 to accommodate the electrode terminal 212.

[0114] Optionally, the insulating coating 232 is applied to the surface of the end cap by spraying, coating, or the like. In other embodiments, the insulating coating 232 can be applied to the surface of the plastic part 214 by spraying, coating, or the like. The insulating coating 232 exhibits good heat resistance, with its heat resistance temperature being above the melting point of the plastic part 214. If the electrode assembly 22 is charged and discharged with high current, or if thermal runaway occurs, causing a temperature increase, the plastic part 214 may melt. At this point, the insulating coating 232 can still insulate the electrode connection element 221 from the end cap, thereby reducing the risk of a short circuit between the electrode connection element 221 and the end cap.The electrode connection element 221 comprises a tab 2211 and an adapter piece 2212, and the insulating coating 232 can insulate the adapter piece 2212 from the end cap while simultaneously insulating the tab 2211 from the end cap.

[0115] In embodiments of the present application, an insulating coating 232 is provided between the end cap and the plastic part 214, which can reduce the risk of the plastic part 214 melting in a high-temperature environment and the electrode connection element 221 coming into direct contact with the end cap, i.e., reducing the risk of a short circuit between the electrode connection element 221 and the outer shell 21. This reduces the risk of thermal runaway caused by an internal short circuit in the battery cell 20 and improves the safety and reliability of the battery cell 20.

[0116] With reference to Fig. 3 and Fig. 6 In some embodiments, the insulating coating 232 is arranged on the surface of the end cap facing the electrode arrangement 22 and does not cover the electrode connection 212.

[0117] Before the plastic part 214 is attached to the end cap, the surface of the end cap is first coated by spraying, coating, physical vapor deposition (PVD), chemical vapor deposition (CVD), or the like. A high-temperature-resistant insulating material is formed on the surface of the end cap to create an insulating coating 232, and the insulating coating 232 bypasses the electrode extraction hole 2113. Since the electrode terminal 212 must be connected to the electrode connecting element 221, the insulating coating 232 does not need to cover the electrode terminal 212. The aforementioned insulating coating 232 is applied to the end cap, is easy to manufacture, exhibits uniform film formation, and can provide good insulation between the end cap and the electrode assembly 22.

[0118] The insulating coating material 232 comprises an organic polymer or a metal oxide. The organic polymer can be polytetrafluoroethylene, polyethylene, polypropylene, polyethylene terephthalate, or polyimide; the metal oxide can be aluminum oxide, aluminum hydroxide, titanium dioxide, or magnesium oxide. Insulating coating 232 made from the aforementioned material exhibits good insulating performance and high temperature resistance. It is understood that insulating coating 232 can also be composed of other materials with insulating and high-temperature-resistant properties.

[0119] In some embodiments, the projection of the electrode connection element 221 along the thickness direction of the first wall 211 lies within the projection area of ​​the insulating coating 232.

[0120] In this way, the electrode connection element 221 can be completely covered by the insulating coating 232. It is understood that at least part of the electrode connection element 221 must be covered with the insulating coating 232.

[0121] In some embodiments, the heat resistance temperature of the insulating coating 232 is provided to be 400°C to 1000°C.

[0122] Since the insulating coating 232 can consist of several high-temperature resistant and insulating materials, its heat resistance temperature varies depending on the material, and the heat resistance temperature range of the insulating coating 232 is relatively large. For example, the heat resistance temperature of the insulating coating 232 can be 400°C, 500°C, 600°C, 700°C, 800°C, 900°C, 1000°C, or similar.

[0123] Using the target battery cell of the LFP module as an example, the thermal runaway temperature is between 240°C and 350°C. The temperature of the electrode assembly 22 rises, causing the plastic part 214 to melt. At this point, the heat resistance temperature of the insulating coating 232 is greater than or equal to 400°C, so the insulating coating 232 can continue to maintain its insulating performance. LFP is a lithium-ion battery; its full name is lithium iron phosphate battery.

[0124] The insulating coating 232 exhibits a high temperature resistance. If the temperature of the battery cell 20 gradually increases and thermal runaway occurs, the insulating coating 232 can retain its chemical properties for a long time and the insulating coating 232 can separate the end cap from the electrode assembly 22. The insulating coating 232 described above can be applied to lithium battery systems.

[0125] The thickness of the insulating coating 232 can range from 0.05 mm to 0.15 mm. This ensures that the thickness of the insulating coating 232 does not significantly increase the thickness of the end cap and provides better protection. For example, the thickness of the insulating coating 232 is 0.1 mm. It is understood that the thickness of the insulating coating 232 can also be adjusted according to the requirements of the battery cell 20. For example, the thickness of the insulating coating 232 can range from 0.02 mm to 0.3 mm.

[0126] With reference to Fig. 3 In some embodiments, the battery cell 20 further comprises a high-temperature resistant protective film 24 which covers at least part of the outer shell 21, the melting point of the high-temperature resistant protective film 24 being greater than or equal to 500°C.

[0127] The high-temperature-resistant protective film 24 consists of a high-temperature-resistant insulating material that separates adjacent battery cells 20 from one another and prevents the effects of various faults in a single battery cell 20 on other battery cells 20. The outer shell 21 is coated with a high-temperature-resistant protective film 24, which can surround the entire surface of the outer shell 21 or at least cover a portion of its surface. In some embodiments, both the end cap and the housing 213 are coated with the high-temperature-resistant protective film 24. The battery cell 20 further comprises an upper patch 215, which is attached to a side of the end cap facing away from the housing 213, and the high-temperature-resistant protective film 24 is coated on the outside of the upper patch 215.

[0128] The melting point of the high-temperature-resistant protective film 24 is greater than or equal to 500°C. When the electrode assembly 22 is charged and discharged with a high current, or when thermal runaway occurs, causing a temperature increase, the high-temperature-resistant protective film 24 on the surface of the electrode assembly 22 does not melt. This reduces heat transfer between the battery cells 20 in the module, lowers the temperature of adjacent battery cells 20, reduces the risk of heat propagation, and further improves safety. In some related technologies, the outer shell 21 is wrapped with a blue film. This blue film is an insulating film used to insulate and protect the battery cells 20, preventing the outer shells 21 of adjacent battery cells from touching each other or from contacting the battery casing and causing a short circuit.The high-temperature-resistant protective film 24 provided by embodiments of the present application replaces the conventional blue film. Compared to the blue film, the high-temperature-resistant protective film 24 can withstand higher temperatures and reduce heat transfer between adjacent battery cells 20.

[0129] In some embodiments, the material of the high-temperature resistant protective film 24 comprises a PI adhesive.

[0130] PI adhesive is an adhesive consisting primarily of polyimide resin, solvent, and curing agent. The proportion of PI adhesive can be adjusted as needed. For example, the material of the high-temperature resistant protective film 24 is mixed with 50% PI adhesive. The high-temperature resistant protective film 24 is a composite film and also includes components such as epoxy resin.

[0131] Since PI adhesive has good heat resistance, the high-temperature resistant protective film 24 significantly improves the resistance performance compared to the conventional blue film.

[0132] In some embodiments, the thickness of the high-temperature-resistant protective film 24 is specified as being between 0.15 mm and 0.25 mm. For example, the thickness of the high-temperature-resistant protective film 24 may be 0.15 mm, 0.2 mm, 0.25 mm, or the like. By adopting the above technical solution, the high-temperature-resistant protective film 24 can not only provide good protection for the battery cells 20, but also avoid taking up too much space in the module.

[0133] With reference to Fig.3 to 7, the battery cell 20 comprises an outer shell 21, an electrode arrangement 22 and a high-temperature resistant insulating layer 23; the outer shell 21 has a first wall 211, and an electrode terminal 212 is arranged on the first wall 211; the electrode arrangement 22 is arranged in the outer shell 21 and an electrode connection element 221 is provided on the electrode arrangement 22, which is electrically connected to the electrode terminal 212; the high-temperature resistant insulating layer 23 is arranged between the first wall 211 and the electrode connection element 221.The high-temperature resistant insulating layer 23 comprises at least one of the protective adhesive 231 and the insulating coating 232. The protective adhesive 231 is provided between the adapter piece 2212 and the first wall 211. The tab connection section 2212b and the tab 2211 are covered with the protective adhesive 231, while the connection connection section 2212a is not covered with the protective adhesive 231. The insulating coating 232 is located between the end cap and the plastic part 214. The battery cell 20 further comprises a high-temperature resistant protective film 24 that covers at least part of the outer shell 21. The battery cell 20 also comprises an insulating plate 223 that covers the outside of the electrode assembly 22 to protect and insulate the electrode assembly 22, thereby preventing the electrode assembly 22 from coming into contact with the outer shell 21 during operation and causing a short circuit.

[0134] The battery cell 20 provided by embodiments of the present application reduces the risk of thermal runaway caused by a short circuit between the electrode arrangement 22 and the outer shell 21, and reduces the risk of combustion or even explosion of the battery cell 20.

[0135] A second aspect of the present application provides a battery 100 comprising the battery cell 20 provided in the first aspect.

[0136] A third aspect of the present application provides a power-consuming device comprising the battery 100 provided in the second aspect, wherein the battery 100 is used to supply the power-consuming device with electrical energy.

[0137] The power-consuming device can be any of the above-mentioned devices or systems that use batteries.

[0138] It should be noted that the features in the embodiments of this application can be combined with each other, provided there is no conflict.

[0139] The above embodiments are used only to illustrate, rather than limit, the technical solutions of the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art in this field should understand that they may still modify the technical solutions recorded in the above embodiments or make equivalent substitutions to some of the technical features; however, these modifications or substitutions do not result in the essential nature of the corresponding technical solutions differing from the spirit and scope of the technical solutions of the various embodiments of this application, and all should be included within the scope of protection of this application. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 202420264406

[0001]

Claims

[1] Battery cell, comprising: an outer shell comprising a first wall and an electrode connection, wherein the electrode connection is located on the first wall; an electrode arrangement arranged in the outer shell, wherein the electrode arrangement comprises an electrode connecting element, the electrode connecting element being electrically connected to the electrode terminal; and a high-temperature resistant insulating layer that is at least partially arranged between the first wall and the electrode connecting element to insulate and separate the first wall from the electrode connecting element. [2] Battery cell according to claim 1, wherein the electrode connection element comprises a tab and an adapter piece, wherein the adapter piece comprises a terminal connection section and a tab connection section which are connected to each other, wherein the terminal connection section is connected to the electrode terminal, and wherein the tab connection section is connected to the tab; wherein the high-temperature resistant insulating layer comprises a protective adhesive which is arranged between the adapter piece and the first wall, wherein, along the thickness direction of the first wall, the projection of the tab connection section and the projection of the tab are at least partially within the projection area of ​​the protective adhesive. [3] Battery cell according to claim 2, wherein the adapter piece contains several tab connection sections, wherein the several tab connection sections are arranged along the width direction of the adapter piece, wherein the connecting connection section is provided between two adjacent tab connection sections; wherein the protective adhesive comprises several adhesive films, wherein the several adhesive films are arranged to each of the several tab connection sections. [4] Battery cell according to claim 3, wherein the length of the adhesive film is greater than or equal to the length of the adapter piece, wherein the width of the adhesive film is greater than or equal to the width of the tab connection section. [5] Battery cell according to claim 4, wherein the tab comprises several stacked tab leaves; wherein along the longitudinal direction of the adapter piece the difference between the length of the adhesive film and the width of the tab leaf is 12 mm to 14 mm. [6] Battery cell according to claim 4 or 5, wherein the width of the adhesive film satisfies the following: W3≥[H+(W1−W2)]*2; where W1 is the width of the tab connection section, W2 is the width of the overlap area between the tab connection section and the tab, W3 is the width of the adhesive film, and H is the height of the tab. [7] Battery cell according to claim 6, wherein the width of the adhesive film satisfies the following: W3=[H+(W1−W2)+2mm]*2. [8] Battery cell according to any one of claims 2 to 7, wherein the thickness of the protective adhesive is 0.1 mm to 0.5 mm. [9] Battery cell according to claim 8, wherein the thickness of the protective adhesive is 0.1 mm to 0.3 mm. [10] Battery cell according to any one of claims 2 to 9, wherein the melting point of the protective adhesive is between 320°C and 500°C. [11] Battery cell according to claim 10, wherein the melting point of the protective adhesive is above 350°C and less than or equal to 500°C. [12] Battery cell according to any one of claims 2 to 11, wherein the protective adhesive is a PI adhesive tape or a Teflon adhesive tape. [13] Battery cell according to any one of claims 1 to 12, wherein the outer shell comprises an end cap and a housing, wherein the end cap forms the first wall and closes the housing, wherein a plastic part is provided on a side of the end cap facing the housing, wherein the plastic part is used to separate the end cap from the electrode arrangement; wherein the high-temperature-resistant insulating layer comprises an insulating coating between the end cap and the plastic part, wherein the heat resistance temperature of the insulating coating is above the melting point of the plastic part. [14] Battery cell according to claim 13, wherein the insulating coating is provided on a surface of the end cap facing the housing and does not cover the electrode connection. [15] Battery cell according to claim 13, wherein the projection of the electrode connection element along the thickness direction of the first wall lies within the projection area of ​​the insulating coating. [16] Battery cell according to any one of claims 13 to 15, wherein the heat resistance temperature of the insulating coating is 400°C to 1000°C. [17] Battery cell according to one of claims 13 to 16, wherein the insulating coating material comprises an organic polymer or a metal oxide, wherein the organic polymer comprises one of polytetrafluoroethylene, polyethylene, polypropylene, polyethylene terephthalate and polyimide, and wherein the metal oxide comprises one of aluminium oxide, aluminium hydroxide, titanium dioxide and magnesium oxide. [18] Battery cell according to any one of claims 13 to 17, wherein the thickness of the insulating coating is 0.05 mm to 0.15 mm. [19] Battery cell according to any one of claims 1 to 18, wherein the battery cell also comprises a high-temperature resistant protective film, wherein the high-temperature resistant protective film covers at least part of the outer shell, wherein the melting point of the high-temperature resistant protective film is greater than or equal to 500°C. [20] Battery cell according to claim 19, wherein the material of the high temperature resistant protective film comprises a PI adhesive. [21] Battery cell according to claim 19 or 20, wherein the thickness of the high temperature resistant protective film is 0.15 mm to 0.25 mm. [22] Battery comprising a battery cell according to any one of claims 1 to 21. [23] Power-consuming device comprising a battery according to claim 22, wherein the battery is used to supply the power-consuming device with electrical energy.

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