Battery cell and manufacturing method therefor, battery, electric device, and energy storage device

Abstract

A battery cell (100) and a manufacturing method therefor, a battery (1100), an electric device, and an energy storage device. The battery cell (100) comprises a casing (11), an electrode assembly (12), and a first insulating coating (13). The electrode assembly (12) is arranged in the casing (11). The casing (11) comprises an outer surface (113) facing away from the electrode assembly (12); and at least part of the outer surface (113) is covered with the first insulating coating (13). The connection strength between the first insulating coating (13) and the casing (11) is good, and the first insulating coating (13) is not easy to fall off, so that the insulation performance of the battery cell (100) can be improved.

Description

Battery cell and manufacturing method thereof, battery, power consumption device and energy storage device Technical Field

[0001] The present application belongs to the field of battery insulation technology, and in particular relates to a battery cell and a manufacturing method thereof, a battery, an electrical device, and an energy storage device. Background Art

[0002] Market developments indicate that batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0003] With the continuous development of battery technology, the requirements for the insulation performance of battery cells in batteries are becoming higher and higher. Therefore, there is an urgent need to provide a battery cell with better insulation performance.

[0004] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art.

[0005] Application Contents

[0006] The purpose of the embodiments of the present application is to provide a battery cell and a manufacturing method thereof, a battery, an electrical device and an energy storage device, in order to improve the insulation performance of the battery cell.

[0007] The technical solution adopted in the embodiment of this application is:

[0008] In a first aspect, a battery cell is provided, which includes a shell, an electrode assembly and a first insulating coating, wherein the electrode assembly is arranged in the shell; wherein the shell includes an outer surface arranged away from the electrode assembly, and at least a portion of the outer surface is covered with the first insulating coating.

[0009] The battery cell of the embodiment of the present application includes a shell and an electrode assembly, the electrode assembly is located in the shell, and at least a portion of the outer surface of the shell facing away from the electrode assembly is provided with a first insulating coating. The outer surface of the shell adopts the first insulating coating to achieve insulation of the battery cell; and the connection strength between the first insulating coating and the shell is good, and the first insulating coating is not easy to fall off, which can help improve the insulation performance of the battery cell.

[0010] In some embodiments, the outer surface includes multiple sides, the multiple sides include a first side, at least an edge area of ​​the first side is covered with a first insulating coating, the other sides except the first side are covered with the first insulating coating, and the first insulating coating covering the first side and the first insulating coating covering the other sides except the first side are connected.

[0011] By adopting the technical solution of this embodiment, the first side surface and the other side surfaces are covered with the first insulating coating, and the first insulating coatings are connected, so that most areas of the shell are covered with the first insulating coating, the insulating area of ​​the battery cell is large, and the insulating effect of the battery cell is good.

[0012] In some embodiments, all areas of the outer surface except the first side surface are covered with the first insulating coating.

[0013] By adopting the technical solution of this embodiment, the outer shell of the battery cell is fully enclosed with an insulation design or a nearly fully enclosed insulation design, and the insulation area of ​​the battery cell is large, which is beneficial to improving the insulation performance of the battery cell.

[0014] In some embodiments, the battery cell further includes an electrode terminal for inputting or outputting electrical energy, and the electrode terminal is disposed on the first side surface.

[0015] In some embodiments, when the battery cell is in use, the top surface of the housing forms the first side surface.

[0016] By adopting the technical solution of this embodiment, the first insulating coating can be applied to the side where the electrode terminal is provided. The first insulating coating has a large coverage area, and the insulating area of ​​the battery cell is large, which is beneficial to improving the insulation performance of the battery cell.

[0017] By adopting the technical solution of this embodiment, the top surface of the shell is also covered with a first insulating coating. The first insulating coating has a large coverage area, and the insulating area of ​​the battery cell is large, which is beneficial to improving the insulation performance of the battery cell. In addition, the insulation performance of the top of the battery cell can also be improved, which is beneficial to improving the reliability of the battery cell.

[0018] In some embodiments, the outer surface includes multiple connected side surfaces, the multiple side surfaces including a first side surface and a second side surface relatively distributed along a first direction, a third side surface and a fourth side surface relatively distributed along a second direction, and a fifth side surface and a sixth side surface relatively distributed along a third direction, the first side surface, the second side surface, the third side surface, the fourth side surface, the fifth side surface and the sixth side surface are covered with a first insulating coating; wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0019] By adopting the technical solution of this embodiment, the first side, second side, third side, fourth side, fifth side and sixth side are covered with a first insulating coating, so that the six sides of the battery cell have insulating properties and a large insulating area, which is beneficial to improving the insulation performance and voltage resistance of the battery cell.

[0020] In some embodiments, the outer surface further includes a connecting surface, at least two adjacent side surfaces are connected by a connecting surface, and at least one connecting surface is covered with a first insulating coating.

[0021] By adopting the technical solution of this embodiment, two adjacent side surfaces are transitionally connected through a connecting surface, which is beneficial to reducing stress concentration and improving the structural strength of the shell; at least one connecting surface is provided with a third insulating coating, which increases the insulating area of ​​the battery cell, which is beneficial to improving the insulation performance and pressure resistance of the battery cell.

[0022] In some embodiments, the battery cell further includes an electrode terminal for inputting or outputting electrical energy, the electrode terminal is electrically connected to the electrode assembly, and the electrode terminal is connected to the outer shell; the first insulating coating is provided with a through hole for allowing the electrode terminal to pass through.

[0023] By adopting the technical solution of this embodiment, the electrode terminal can pass through the through hole to avoid the electrode terminal, thereby facilitating the electrical connection of the electrode terminal; the side of the shell where the electrode terminal is provided is also covered with a first insulating coating. The first insulating coating has a large coverage area, which is beneficial to improving the insulation performance of the battery cell.

[0024] In some embodiments, the through holes are arranged in a one-to-one correspondence with the electrode terminals.

[0025] By adopting the technical solution of this embodiment, the first insulating coating can be filled between the electrode terminals, thereby improving the insulation effect between the electrode terminals. It can also increase the area of ​​the battery cell covered by the first insulating coating, which is beneficial to improving the insulation and withstand voltage effect of the battery cell.

[0026] In some embodiments, the through holes are provided to be gap-matched with the electrode terminals.

[0027] By adopting the technical solution of this embodiment, a gap is formed between the electrode terminal and the first insulating coating, reducing the risk of the first insulating coating covering the electrode terminal, so that the electrode terminal can be well electrically connected to components such as the busbar component, facilitating the output and input of electrical energy by the electrode terminal.

[0028] In some embodiments, the maximum distance between the hole wall of the through hole and the electrode terminal is L, where 0 mm < L ≤ 3 mm.

[0029] By adopting the technical solution of this embodiment, the risk of the first insulating coating covering the electrode terminal can be reduced. At the same time, the maximum distance between the through hole and the electrode terminal will not be too large, so that most of the side area of ​​the shell where the electrode terminal is provided can be covered by the first insulating coating, which is beneficial to improving the insulation performance of this side.

[0030] In some embodiments, 0.3 mm ≤ L ≤ 2 mm.

[0031] By adopting the technical solution of this embodiment, the maximum distance between the through hole and the electrode terminal can be set more reasonably, and both the insulation performance of the battery cell and the electrical connection of the electrode terminal can be taken into account.

[0032] In some embodiments, the battery cells are covered with an insulating film.

[0033] By adopting the technical solution of this embodiment, the insulating film can improve the insulation performance of the battery cell, so that the insulation and voltage resistance performance of the battery cell is better.

[0034] In some embodiments, the first insulating coating includes at least one of a first resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

[0035] By adopting the technical solution of this embodiment, the first insulating coating has a good insulating effect. In addition, the first insulating coating is not easily damaged when thermal runaway does not spread, which is beneficial to improving the insulation reliability of the battery cell. Moreover, the structure of the first insulating coating can be flexibly selected to meet different usage requirements.

[0036] In some embodiments, where the first insulating coating layer includes a first resin coating layer, the first resin coating layer includes a photosensitive resin coating layer.

[0037] By adopting the technical solution of this embodiment, the photosensitive resin can be quickly cured to form a photosensitive resin coating after being irradiated by ultraviolet rays, which is beneficial to reducing the preparation time of the first insulating coating and reducing the production cost of the battery cell.

[0038] In some embodiments, the photosensitive resin coating layer includes at least one of an epoxy acrylate layer, a polyurethane acrylate layer, a polyester acrylate layer, an amino acrylate layer, and a photoimageable alkali-soluble resin layer.

[0039] By adopting the technical solution of this embodiment, the first insulating coating can be quickly cured and formed, which reduces the production time and production cost. In addition, the material of the photosensitive resin coating can be flexibly set to meet different usage requirements.

[0040] In some embodiments, the first insulating coating layer has a thickness ranging from 10 μm to 800 μm.

[0041] By adopting the technical solution of this embodiment, the layer thickness of the first insulating coating is reasonably set, so that the first insulating coating has good insulation and voltage resistance performance; at the same time, the layer thickness of the first insulating coating is not too large, which is beneficial to reducing the production cost of the battery cell, improving the heat conduction efficiency, and improving the heat exchange effect of the battery cell.

[0042] In some embodiments, the first insulating coating layer has a thickness ranging from 70 μm to 140 μm.

[0043] By adopting the technical solution of this embodiment, the thickness of the first insulating coating layer is set more reasonably, which can better take into account the insulation performance, production cost and heat exchange effect of the first insulating coating layer.

[0044] In some embodiments, the conductivity of the first insulating coating is in the range of 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

[0045] By adopting the technical solution of this embodiment, the conductivity of the first insulating coating is relatively small, and the first insulating coating has good insulating properties, so that the battery cell has good insulating properties; in addition, the conductivity of the first insulating coating is not too small, so that the first insulating coating can be made of relatively cheap materials, which is beneficial to reducing the production cost of the first insulating coating.

[0046] In some embodiments, the conductivity of the first insulating coating is in the range of 1.00*10 -17 S / cm~1.00*10 -14 S / cm.

[0047] By adopting the technical solution of this embodiment, the design of the electrical conductivity of the first insulating coating is more reasonable, and the production cost and insulation performance of the first insulating coating can be better taken into account.

[0048] In a second aspect, a battery is provided, comprising the battery cell as described in the above embodiment.

[0049] The battery of the embodiment of the present application adopts the above-mentioned battery cell. The battery cell has good insulation performance and the battery has good pressure resistance, which is beneficial to improving the insulation reliability of the battery. It can also meet the demand for higher voltage battery use and is also beneficial to improving the insulation reliability of the battery.

[0050] In some embodiments, the battery further includes a case, and the battery cells are located in the case.

[0051] By adopting the technical solution of this embodiment, the box body can protect the battery cells, which is beneficial to improving the reliability of the battery.

[0052] In some embodiments, the surface of the casing facing the battery cells is covered with a second insulating coating.

[0053] By adopting the technical solution of this embodiment, the second insulating coating can increase the insulation performance between the battery cell and the box body, which is beneficial to the insulation performance and voltage resistance of the battery; in addition, the second insulating coating covering the box body can also play an anti-corrosion role, which is beneficial to improving the service life of the box body.

[0054] In some embodiments, the second insulating coating includes at least one of a second resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

[0055] By adopting the technical solution of this embodiment, the second insulating coating has a good insulation effect. In addition, the second insulating coating is not easily damaged when thermal runaway does not spread, which is beneficial to improving the insulation reliability of the battery. The second insulating coating can be flexibly selected to meet different usage requirements.

[0056] In some embodiments, the second insulating coating layer includes a second resin coating layer including at least one of an epoxy resin layer, an acrylic resin layer, a polybutadiene resin layer, and a polyurethane resin layer.

[0057] By adopting the technical solution of this embodiment, the material of the second resin coating can be flexibly set to meet different usage requirements.

[0058] In some embodiments, the battery further includes an insulating adhesive layer adhered between the second insulating coating layer and the battery cell.

[0059] By adopting the technical solution of this embodiment, the box body and the battery cell can be insulated and separated by two layers of insulation structure, namely the second insulation coating and the insulation adhesive layer, which can increase the insulation performance between the battery cell and the box body, and is beneficial to the insulation performance and pressure resistance of the battery.

[0060] In some embodiments, the surface of the second insulating coating layer facing the battery cell is covered with a third insulating coating layer.

[0061] By adopting the technical solution of this embodiment, two layers of insulation can be achieved through the second insulating coating and the third insulating coating, and the insulation pressure resistance performance between the battery cell and the box body is good, which is beneficial to the insulation performance and pressure resistance performance of the battery; in addition, the connection strength between the second insulating coating and the third insulating coating is good, so that the insulation reliability between the box body and the battery cell is good, which is beneficial to improving the reliability of the battery.

[0062] In some embodiments, the battery further includes an insulating adhesive layer adhered between the third insulating coating layer and the battery cell.

[0063] By adopting the technical solution of this embodiment, the three-layer insulation structure of the second insulation coating, the third insulation coating and the insulating adhesive layer between the box body and the battery cell is insulated and separated, so that the box body and the battery cell are separated by the multi-layer insulation structure, and the insulation performance and pressure resistance between the box body and the battery cell are good, which is beneficial to improving the insulation and pressure resistance reliability and the use reliability of the battery; in addition, the insulating adhesive layer can bond the battery cell and the box body, so that the battery cell and the box body are connected into a whole, which is beneficial to improving the structural strength and modal performance of the battery.

[0064] In some embodiments, the battery further includes an insulating strip embedded in the insulating adhesive layer.

[0065] By adopting the technical solution of this embodiment, the battery cell and the box body can be insulated and separated by the insulating strip, which is beneficial to improving the insulation pressure resistance performance between the battery cell and the box body and improving the reliability of the battery; in addition, the size of the insulating strip can be used to control the thickness of the insulating adhesive layer, which facilitates the connection between the battery cell and the box body, reduces the amount of glue applied, and reduces the production cost.

[0066] In some embodiments, the insulating adhesive layer includes an adhesive portion, and an adhesive portion is provided between the insulating strip and the battery cell; and / or an adhesive portion is provided between the insulating strip and the third insulating coating layer.

[0067] By adopting this technical solution, the bonding part can increase the insulation pressure resistance performance between the battery cell and the box, which is beneficial for the battery to be used in devices with higher voltages; in addition, the bonding part can fix the insulating strip, which is beneficial for improving the insulation reliability between the battery cell and the box.

[0068] In some embodiments, the third insulating coating includes at least one of a third resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

[0069] By adopting the technical solution of this embodiment, the third insulating coating has a good insulation effect. In addition, the third insulating coating is not easily damaged when thermal runaway does not spread, which is beneficial to improving the insulation reliability of the battery. The third insulating coating can be flexibly selected to meet different usage requirements.

[0070] In some embodiments, the third insulating coating layer includes a third resin coating layer including at least one of an epoxy resin layer, a phenolic resin layer, an acrylic resin layer, a melamine formaldehyde resin layer, and a silicone resin layer.

[0071] By adopting the technical solution of this embodiment, the material of the third resin coating layer can be flexibly set to meet different usage requirements.

[0072] In some embodiments, the housing includes a heat exchange plate including a flow channel for a heat exchange medium to flow so that the heat exchange medium can exchange heat with the battery cells. The surface of the heat exchange plate facing the battery cells is covered with a second insulating coating.

[0073] By adopting the technical solution of this embodiment, the heat exchange plate is used to exchange heat for the battery cell, which is beneficial to controlling the temperature of the battery cell. The heat exchange plate is provided with a second insulating coating, which can also insulate the heat exchange plate from the battery cell, thereby improving the reliability of the battery.

[0074] In some embodiments, the box body includes a first part and a second part, the first part and the second part are connected and enclosed to form a receiving space, the battery cell is located in the receiving space, the second part is used to support the battery cell, the second part includes a metal part, and the outer shell includes a metal shell.

[0075] By adopting the technical solution of this embodiment, the second part of the box and the outer shell are both made of metal materials, so that the box and the battery cell have good structural strength, which is conducive to improving the reliability of the battery.

[0076] In a third aspect, an electrical device is provided, comprising the battery as described in the above embodiment.

[0077] The electrical device of the embodiment of the present application adopts the above-mentioned battery, which has good insulation and voltage resistance performance, is beneficial to improving the reliability of the electrical device and is also beneficial to meeting the use requirements of high-voltage electrical devices.

[0078] In a fourth aspect, an energy storage device is provided, comprising the battery as described in the above embodiment.

[0079] The energy storage device of the embodiment of the present application uses the above-mentioned battery, which has good insulation and voltage resistance performance, is beneficial to improving the reliability and service life of the energy storage device, and is also beneficial to meeting the use requirements of high-voltage energy storage devices.

[0080] In a fifth aspect, a battery cell manufacturing method is provided, wherein the battery cell manufacturing method is used to manufacture the battery cell as described in the above embodiment, and the battery cell manufacturing method includes:

[0081] Installing the electrode assembly into the housing;

[0082] An insulating coating is applied to at least a portion of the outer surface of the housing to prepare a first insulating coating.

[0083] The battery cell manufacturing method of the embodiment of the present application places the production of the first insulating coating after the electrode assembly is installed in the shell, which can avoid damage to the first insulating coating caused by the electrode assembly being installed in the shell, is beneficial to improving the yield rate of the battery cell, and is beneficial to reducing the production cost of the battery cell.

[0084] In some embodiments, forming the first insulating coating comprises:

[0085] The first insulating coating is prepared by using ultraviolet light curing printing technology.

[0086] By adopting the technical solution of this embodiment, the first insulating coating can be printed at high speed and high quality using ultraviolet light curing printing technology, which is beneficial to shortening the production time of battery cells, reducing the production cost of battery cells, and is also environmentally friendly; in addition, during the printing process, the information of the battery cell can also be printed on the outer shell, which can eliminate the top patch, label and other components, and is beneficial to reducing the production cost of the battery cell; the first insulating coating produced by ultraviolet light curing printing technology has a good connection strength with the outer shell, and the first insulating coating is not easy to fall off, thereby improving the insulation and voltage resistance performance of the battery cell.

[0087] In some embodiments, installing the electrode assembly into the housing comprises:

[0088] Installing the electrode assembly into the housing through the opening of the housing;

[0089] The end cover of the shell is fitted onto the opening of the housing to seal the opening of the housing.

[0090] By adopting the technical solution of this embodiment, the first insulating coating is prepared before the end cover is installed on the opening of the shell, which can avoid damage to the first insulating coating during assembly of the end cover and the shell, and is conducive to improving the yield rate of the battery cell.

[0091] In some embodiments, after the electrode assembly is installed in the housing and before the insulating coating is applied to at least a portion of the outer surface of the housing, the battery cell manufacturing method further includes:

[0092] Clean at least the outer surface of the housing in the areas where insulating paint is to be applied;

[0093] And / or, after forming the first insulating coating layer, the battery cell manufacturing method further comprises:

[0094] Test the insulation and voltage resistance performance of the battery cells to determine whether the battery cells are qualified.

[0095] By adopting the technical solution of this embodiment, the manufacturing process of the battery cell can be flexibly selected to meet different usage requirements.

[0096] In some embodiments, the battery cell manufacturing method further includes testing the insulation and withstand voltage performance of the battery cell. After forming the first insulating coating layer and before testing the insulation and withstand voltage performance of the battery cell, the battery cell manufacturing method further includes:

[0097] The layer thickness of the first insulating coating was measured.

[0098] By adopting the technical solution of this embodiment, the thickness of the first insulating coating is measured before the insulation withstand voltage test, so as to preliminarily confirm whether the insulation performance of the first insulating coating meets the requirements. In this way, the insulation performance of the first insulating coating can be understood in a timely manner, which is convenient for subsequent insulation withstand voltage performance testing.

[0099] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0100] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0101] FIG1 is a schematic structural diagram of a battery cell provided by some embodiments of the present application after a first insulating coating is hidden.

[0102] FIG2 is a schematic structural diagram of a battery cell provided in some other embodiments of the present application.

[0103] FIG3 is a cross-sectional view taken along line AA in FIG2 .

[0104] FIG4 is a cross-sectional view along line BB in FIG2 .

[0105] FIG5 is an exploded schematic diagram of a battery cell provided in some other embodiments of the present application.

[0106] FIG6 is a schematic diagram of an exploded view of a battery provided in some embodiments of the present application.

[0107] FIG7 is a schematic structural diagram of the battery shown in FIG6 .

[0108] FIG8 is a cross-sectional view taken along line CC in FIG7 .

[0109] FIG9 is a partial enlarged view of point D in FIG8 .

[0110] FIG10 is a partial enlarged view of a battery provided in some other embodiments of the present application at point D in FIG8 .

[0111] FIG11 is a partial enlarged view of a battery provided in some other embodiments of the present application at point D in FIG8 .

[0112] FIG. 12 is an exploded schematic diagram of another embodiment of the battery shown in FIG. 6 .

[0113] FIG13 is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0114] FIG14 is a schematic structural diagram of an energy storage container provided in some embodiments of the present application.

[0115] FIG15 is a flow chart of a battery cell manufacturing method provided in some embodiments of the present application.

[0116] FIG16 is a flow chart of a battery cell manufacturing method provided in some other embodiments of the present application.

[0117] In the figures, the reference numerals are as follows: 1000, vehicle; 1100, battery; 1200, controller; 1300, motor; 100, battery cell; 11, housing; 111. End cap; 112. Shell; 113. Outer surface; 1131. Side; 11311. First side; 11312. Second side; 11313. Third side; 11314. Fourth side; 11315. Fifth side; 11316. Sixth side; 1132. Connecting surface; 12. Electrode assembly; 13. First insulating coating; 131. Through hole; 14. Electrode terminal; 15. Insulating film; 200. Box body; 201. Box wall; 202. Accommodating space; 21. First part; 211. Top wall; 22. Second part; 221. Bottom wall; 222. Side wall; 23. Heat exchange plate; 24. Second insulating coating; 25. Third insulating coating; 300. Insulating adhesive layer; 31. Adhesive portion; 400. Insulating strip; 2000. Energy storage container; 2100. Container; 2200. Battery compartment. DETAILED DESCRIPTION

[0118] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0119] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0120] In the description of the embodiments of this application, the technical terms "first," "second," etc., are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance, or to implicitly specify the quantity, specific order, or primary-secondary relationship of the technical features indicated. Therefore, a feature designated "first" or "second" may explicitly or implicitly include one or more of such features.

[0121] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least some embodiments of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments in any suitable manner.

[0122] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0123] In the description of the embodiments of this application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more (including two groups), and "multiple sheets" refers to two or more (including two sheets). "Several" means one or more, unless otherwise specifically defined.

[0124] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0125] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0126] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0127] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0128] A battery includes multiple battery cells to meet the needs of different capacities. In addition, as the application range of batteries continues to expand, the insulation performance requirements of the battery cells in the battery are becoming increasingly higher. Therefore, there is an urgent need to provide a battery cell with better insulation performance.

[0129] In the related art, a battery cell is provided, wherein the outer shell of the battery cell is covered with an insulating film. However, the insulating film is easily separated from the outer shell, causing insulation failure in the battery cell and poor insulation effect of the battery cell.

[0130] In order to improve the insulation performance of a battery cell, an embodiment of the present application provides a battery cell, which includes a shell, an electrode assembly and a first insulating coating. At least a portion of the outer surface of the shell facing away from the electrode assembly is provided with a first insulating coating. The outer surface of the shell is insulated by the first insulating coating, and the connection strength between the first insulating coating and the shell is good. The first insulating coating is not easy to fall off, which can help improve the insulation performance of the battery cell.

[0131] The battery cells, batteries, electrical devices and energy storage devices of the embodiments of the present application are described below.

[0132] The battery cells of the embodiments of the present application can be secondary batteries or primary batteries; they can also be lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries. The battery cells can be cylindrical, flat, rectangular, or in other shapes.

[0133] For ease of understanding and description, the embodiments provided in this application are described only with respect to rectangular parallelepiped battery cells. It should be understood that the embodiments provided in this application are also applicable to cylindrical battery cells or soft-pack battery cells.

[0134] Referring to Figures 1 to 5, in some embodiments of the present application, a battery cell 100 is provided, which includes a shell 11, an electrode assembly 12 and a first insulating coating 13, and the electrode assembly 12 is arranged in the shell 11; the shell 11 includes an outer surface 113, and the outer surface 113 is arranged to face away from the electrode assembly 12; wherein, at least a portion of the outer surface 113 is covered with the first insulating coating 13.

[0135] The outer shell 11 is a shell structure with a space inside that accommodates and protects the electrode assembly 12. The outer shell 11 can be made of a material with a certain degree of hardness and strength. This prevents deformation when subjected to compression or collision, thus providing the battery cell 100 with greater structural strength and improved reliability. The outer shell 11 can be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0136] The electrode assembly 12 may refer to a component where an electrochemical reaction occurs within the battery cell 100 .

[0137] For example, the electrode assembly 12 includes a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly 12 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 current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The portion of the positive electrode current collector not coated with the positive electrode active material layer protrudes from the portion coated with the positive electrode active material layer. The portion not coated with the positive electrode active material layer serves as the positive electrode tab, or a metal conductor is welded to the positive electrode current collector and led out to serve as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current 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 current collector and a negative active material layer. The negative active material layer is applied to the surface of the current collector. The portion of the current collector not coated with the negative active material layer protrudes from the portion coated with the layer. This portion serves as the negative electrode tab, or a metal conductor is welded to the negative current collector and extended to serve as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. It is understood that the electrode assembly 12 can have one positive electrode tab and one negative electrode tab. In other words, the electrode assembly 12 is provided with two sets of tabs, each containing at least one tab, with one set being the positive electrode tab and the other being the negative electrode tab.

[0138] The electrode assembly 12 can be a wound structure or a laminated structure. The embodiments of the present application are not limited to this. The wound structure is mostly to weld the tabs to the current collector, and then arrange them in the order of positive electrode sheet - diaphragm - negative electrode sheet - diaphragm; and then form a cylindrical or square battery cell by winding. The laminated structure is mostly to lead the tabs on the current collector, arrange the positive electrode sheet, negative electrode sheet and diaphragm in the order of positive electrode sheet - diaphragm - negative electrode sheet - diaphragm, and stack them layer by layer to form a laminated battery cell; wherein, the diaphragm can be cut and directly laminated with the diaphragm sheet, or the diaphragm is not cut, but is folded in a Z shape. The material of the diaphragm can be PP (Polypropylene, polypropylene) or PE (Polyethylene, polyethylene), etc. The diaphragm is an insulating member arranged between the positive electrode sheet and the negative electrode sheet. Its main function is to isolate the positive and negative electrodes and prevent the electrons in the battery from passing freely, to prevent short circuits to a certain extent, and to allow the ions in the electrolyte to pass freely between the positive and negative electrodes to form a loop between the positive and negative electrodes. The positive electrode sheet and the negative electrode sheet are collectively referred to as the electrode sheet. The positive electrode tab and the negative electrode tab are collectively referred to as the tab.

[0139] The outer shell 11 may include an inner surface and an outer surface 113. The inner surface is arranged toward the electrode assembly 12 and is arranged to form a cavity for accommodating the electrode assembly 12, and the outer surface 113 may refer to the surface of the outer shell 11 exposed to the outside of the outer shell 11, or may refer to the surface of the outer shell 11 facing away from the inner surface; the outer surface 113 of the outer shell 11 may also refer to the entire surface that is arranged to form the outer shape of the outer shell 11.

[0140] The first insulating coating 13 may be a coating structure having insulating properties. The insulating coating is applied to the outer surface 113 of the housing 11 to form the first insulating coating 13. For example, the insulating coating 13 may be formed by, but is not limited to, spraying, electrophoresis, or printing. The insulating coating may be made of, but is not limited to, resin or plastic.

[0141] The first insulating coating 13 may cover a portion of the outer surface 113 of the shell 11 or the entire outer surface 113 of the shell 11 , thereby achieving a fully wrapped insulation design of the shell 11 of the battery cell 100 and improving the insulation performance of the battery cell 100 .

[0142] The battery cell 100 of the embodiment of the present application includes a shell 11 and an electrode assembly 12. The electrode assembly 12 is located in the shell 11. At least a portion of the outer surface 113 of the shell 11 facing away from the electrode assembly 12 is provided with a first insulating coating 13. The outer surface 113 of the shell 11 adopts the first insulating coating 13 to achieve insulation of the battery cell 100. Moreover, the connection strength between the first insulating coating 13 and the shell 11 is good, and the first insulating coating 13 is not easy to fall off, which can help improve the insulation performance of the battery cell 100.

[0143] In other embodiments of the present application, referring to Figures 1 to 4, the outer surface 113 includes multiple side surfaces 1131, the multiple side surfaces 1131 include a first side surface 11311, at least an edge area of ​​the first side surface 11311 is covered with a first insulating coating 13, and the other side surfaces 1131 except the first side surface 11311 are covered with a first insulating coating 13, and the first insulating coating 13 covering the first side surface 11311 and the first insulating coating 13 covering the other side surfaces 1131 except the first side surface 11311 are connected.

[0144] The side surface 1131 may refer to a surface located on one side of the housing 11 and facing away from the electrode assembly 12. The side surface 1131 is exposed outside the battery cell 100. Multiple side surfaces 1131 are connected to define the outer shape of the housing 11. The shape of the side surface 1131 may be, but is not limited to, a flat surface or a curved surface.

[0145] One of the multiple side surfaces 1131 may be referred to as a first side surface 11311 ; for example, referring to FIG1 , the first side surface 11311 is the top surface of the housing 11 . Of course, in other embodiments, the first side surface 11311 may also be the bottom surface or side surface of the housing 11 .

[0146] The edge area of ​​the first side surface 11311 may refer to an area of ​​the first side surface 11311 close to other side surfaces 1131, for example: referring to Figures 2 and 3, the edge area of ​​the first side surface 11311 may refer to a peripheral area of ​​the first side surface 11311, and the edge area of ​​the first side surface 11311 is covered with the first insulating coating 13, or the edge area and the middle area of ​​the first side surface 11311 are both covered with the first insulating coating 13; or all areas of the first side surface 11311 are covered with the first insulating coating 13.

[0147] Among the other side surfaces 1131 of the outer surface 113 except the first side surface 11311, only a part of the side surface 1131 may be covered with the first insulating coating 13, or the entire side surface 1131 may be covered with the first insulating coating 13, but the first side surface 11311 and the other side surfaces 1131 covered with the first insulating coating 13 are connected, so that most areas of the outer shell 11 are covered with the first insulating coating 13.

[0148] By adopting the technical solution of this embodiment, the first side surface 11311 and the other side surfaces 1131 are both covered with the first insulating coating 13, and the first insulating coatings 13 are connected, so that most areas of the outer shell 11 are covered with the first insulating coating 13, the insulating area of ​​the battery cell 100 is large, and the insulating effect of the battery cell 100 is good.

[0149] In some other embodiments of the present application, referring to FIG. 1 to FIG. 4 , all areas of the outer surface 113 except the first side surface 11311 are covered with the first insulating coating 13 .

[0150] Except for the side surfaces 1131 between the first side surfaces 11311, each side surface 1131 is fully covered with the first insulating coating 13, and the area between two adjacent side surfaces 1131 is also fully covered with the first insulating coating 13. For example, referring to Figures 1 to 4, the circumferential surface surrounding the first side surface 11311 and the side surface 1131 opposite the first side surface 11311 are both fully covered with the first insulating coating 13.

[0151] The shape of the outer shell 11 of the battery cell 100 may be a cylinder, a prism, a cuboid, etc. For example, when the shape of the outer shell 11 of the battery cell 100 is a cylinder and the first side 11311 may be one end face of the outer shell 11, the other end of the outer shell 11 and the cylindrical surface of the outer shell 11 are regionally covered with the first insulating coating 13; when the shape of the outer shell 11 of the battery cell 100 is a prism and the first side 11311 is one end face of the outer shell 11 in the axial direction, the other end face of the outer shell 11 and all faces parallel to the axis of the outer shell 11 are fully covered with the first insulating coating 13; when the shape of the outer shell 11 of the battery cell 100 is a cuboid, the first side 11311 may be one of the side faces 1131 in the outer shell 11, and all faces except the first side 11311 are fully covered with the first insulating coating 13.

[0152] By adopting the technical solution of this embodiment, the shell 11 of the battery cell 100 is fully enclosed with an insulation design or a nearly fully enclosed insulation design, and the insulation area of ​​the battery cell 100 is large, which is beneficial to improving the insulation performance of the battery cell 100.

[0153] In other embodiments of the present application, referring to FIGS. 1 to 4 , the battery cell 100 further includes an electrode terminal 14 for inputting or outputting electrical energy. The electrode terminal 14 is disposed on the first side surface 11311 .

[0154] The electrode terminal 14 is a conductive member provided on the outer casing 11. The electrode terminal 14 is connected to the tab of the electrode assembly 12 to output power from the battery cell 100 or to charge the battery cell 100. A battery cell 100 generally has two electrode terminals 14, which are respectively connected to the positive and negative tabs of the electrode assembly 12. The electrode terminal 14 connected to the positive tab is the positive electrode terminal, and the electrode terminal 14 connected to the negative tab is the negative electrode terminal.

[0155] The side surface 1131 on which the electrode terminal 14 is provided forms a first side surface 11311 , wherein two electrode terminals 14 may be provided on the same side surface 1131 , and the side surface 1131 is referred to as the first side surface 11311 ; if two electrode terminals 14 are provided on two side surfaces 1131 , then both side surfaces 1131 are referred to as the first side surface 11311 .

[0156] By adopting the technical solution of this embodiment, the first insulating coating 13 can be coated on the side 1131 where the electrode terminal 14 is provided. The first insulating coating 13 has a large coverage area, and the insulating area of ​​the battery cell 100 is large, which is beneficial to improving the insulation performance of the battery cell 100.

[0157] In other embodiments of the present application, referring to FIGS. 1 to 4 , when the battery cell 100 is in use, the top surface of the housing 11 forms a first side surface 11311 .

[0158] In the usage state of the battery cell 100 , which may refer to a state in which the battery cell 100 is in the battery 1100 , or may refer to other states, the top surface of the housing 11 forms the first side surface 11311 .

[0159] By adopting the technical solution of this embodiment, the top surface of the shell 11 is also covered with the first insulating coating 13. The first insulating coating 13 covers a large area, and the insulating area of ​​the battery cell 100 is large, which is beneficial to improving the insulation performance of the battery cell 100; in addition, the insulation performance of the top of the battery cell 100 can also be improved, which is beneficial to improving the reliability of the battery cell 100.

[0160] In other embodiments of the present application, referring to Figures 1 to 4, the outer surface 113 includes a plurality of connected side surfaces 1131, the plurality of side surfaces 1131 include a first side surface 11311 and a second side surface 11312 relatively distributed along a first direction, a third side surface 11313 and a fourth side surface 11314 relatively distributed along a second direction, and a fifth side surface 11315 and a sixth side surface 11316 relatively distributed along a third direction, the first side surface 11311, the second side surface 11312, the third side surface 11313, the fourth side surface 11314, the fifth side surface 11315 and the sixth side surface 11316 are covered with a first insulating coating 13; wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0161] The multiple sides 1131 include a first side 11311, a second side 11312, a third side 11313, a fourth side 11314, a fifth side 11315 and a sixth side 11316; it can be understood that the six sides 1131 among the multiple sides 1131 are respectively the first side 11311, the second side 11312, the third side 11313, the fourth side 11314, the fifth side 11315 and the sixth side 11316.

[0162] The first side surface 11311 and the second side surface 11312 are arranged at intervals along the first direction. The first side surface 11311 can be arranged parallel to the second side surface 11312 or arranged at intervals relative to each other. The first side surface 11311 can be perpendicular to the first direction or inclined relative to the first direction, and the specific design can be based on the shape of the battery cell 100.

[0163] The third side surface 11313 and the fourth side surface 11314 are arranged at intervals along the second direction. The third side surface 11313 can be arranged parallel to the fourth side surface 11314 or arranged at intervals relative to each other. The third side surface 11313 can be perpendicular to the second direction or inclined relative to the second direction, and its specific design can be based on the shape of the battery cell 100.

[0164] The fifth side 11315 and the sixth side 11316 are arranged at intervals along the third direction. The fifth side 11315 can be arranged parallel to the sixth side 11316 or arranged at intervals relative to each other. The fifth side 11315 can be perpendicular to the third direction or inclined relative to the third direction, and its specific design can be based on the shape of the battery cell 100.

[0165] The first direction is perpendicular to the second direction, the second direction is perpendicular to the third direction, and the third direction is perpendicular to the first direction. For example, referring to FIG1 , the housing 11 is in the shape of a rectangular parallelepiped and has a height direction, a width direction, and a length direction. The first direction can be referred to as the height direction Z of the housing 11, the second direction can be referred to as the width direction Y of the housing 11, and the third direction can be referred to as the length direction X of the housing 11. The housing 11 defines the outer shape of the battery cell 100. The height direction of the battery cell 100 is parallel to the height direction of the housing 11, the width direction of the battery cell 100 is parallel to the width direction of the housing 11, and the length direction of the battery cell 100 is parallel to the length direction of the housing 11.

[0166] The first side 11311 may be partially covered with the first insulating coating 13 or the entire area; the second side 11312 may be partially covered with the first insulating coating 13 or the entire area; the third side 11313 may be partially covered with the first insulating coating 13 or the entire area; the fourth side 11314 may be partially covered with the first insulating coating 13 or the entire area; the fifth side 11315 may be partially covered with the first insulating coating 13 or the entire area; the sixth side 11316 may be partially covered with the first insulating coating 13 or the entire area.

[0167] By adopting the technical solution of this embodiment, the first side 11311, the second side 11312, the third side 11313, the fourth side 11314, the fifth side 11315 and the sixth side 11316 are covered with the first insulating coating 13, so that the six sides of the battery cell 100 have insulating properties and a large insulating area, which is beneficial to improving the insulation performance and voltage resistance of the battery cell 100.

[0168] In some embodiments, as shown in Figure 6, multiple battery cells 100 are arranged in a rectangular shape in the box body 200, and the first insulating coating 13 covering the third side 11313, the fourth side 11314, the fifth side 11315 and the sixth side 11316 is located between the battery cells 100, which can achieve insulation between adjacent battery cells 100; and the first insulating coating 13 covering the first side 11311 and the second side 11312 can achieve insulation between the box body 200 and the battery cells 100. In this way, all-round insulation of the battery cells 100 can be achieved, thereby improving the insulation performance of the battery cells 100 and the insulation performance between the battery cells 100 and the box body 200.

[0169] In some embodiments, referring to Figures 1 and 5, the housing 11 includes an end cover 111 and a shell 112, the shell 112 forms an opening at the end in the first direction, the end cover 111 is covered at the opening, the surface of the end cover 111 facing away from the shell 112 forms a first side 11311, the surface of the shell 112 facing away from the end cover 111 forms a second side 11312, the two surfaces of the shell 112 relatively distributed along the second direction respectively form a third side 11313 and a fourth side 11314, and the two surfaces of the shell 112 relatively distributed along the third direction respectively form a fifth side 11315 and a sixth side 11316.

[0170] The end cap 111 refers to a component that covers the opening of the shell 112 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cap 111 can be adapted to the shape of the shell 112 to match the shell 112. Optionally, the end cap 111 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 111 is not easily deformed when squeezed or collided, so that the battery cell 100 can have a higher structural strength and improved safety performance. The material of the end cap 111 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0171] The housing 112 is a component used to cooperate with the end cap 111 to form an internal environment for the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 12. The housing 112 and the end cap 111 can be independent components. An opening can be provided in the housing 112, and the end cap 111 is closed at the opening to form the internal environment of the battery cell 100. The housing 112 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any particular limitations on this.

[0172] The shell 112 may be in the shape of a cuboid. An opening is provided at one end of the shell 112 in the height direction. The opening is connected to the inner cavity of the shell 112 so that the electrode assembly 12 can be loaded into the shell 112 . The end cover 111 is covered on the opening to seal the shell 112 . The shape of the shell 112 defines the shape of the outer shell 11, the height direction of the shell 112 is parallel to the height direction of the outer shell 11, the width direction of the shell 112 is parallel to the height direction of the outer shell 11, and the length direction of the shell 112 is parallel to the height direction of the outer shell 11. The end cover 111 covers the opening at the end of the shell 112 in the height direction, so that the surface of the end cover 111 facing away from the shell 112 forms a first side 11311, the surface of the shell 112 facing away from the end cover 111 forms a second side 11312, and the two surfaces of the shell 112 that are relatively distributed along the width direction of the shell 112 respectively form a third side 11313 and a fourth side 11314, and the two surfaces of the shell 112 that are relatively distributed along the length direction of the shell 112 respectively form a fifth side 11315 and a sixth side 11316.

[0173] By adopting the technical solution of this embodiment, the outer shell 11 adopts the structure of the end cover 111 and the shell 112. The electrode assembly 12 can be installed in the shell 112 through the opening of the shell 112, and then the opening of the shell 112 can be closed by the end cover 111, which facilitates the operation of inserting the electrode assembly 12 into the shell, and the battery cell 100 is simple to manufacture.

[0174] In other embodiments of the present application, referring to FIG. 1 , FIG. 3 and FIG. 4 , the outer surface 113 further includes a connecting surface 1132 , and a connecting surface 1132 is connected between at least two adjacent side surfaces 1131 . At least one connecting surface 1132 is covered with a first insulating coating 13 .

[0175] The connecting surface 1132 may be a surface used to connect two adjacent side surfaces 1131. The connecting surface 1132 may have various shapes, such as an arc surface or a flat surface. Connecting two adjacent side surfaces 1131 via an arc surface or a flat surface can reduce stress concentration, improve the structural strength of the housing 11, and enhance the insulation reliability of the battery cell 100.

[0176] Two adjacent side surfaces 1131 of a portion are connected via a connecting surface 1132 , and two adjacent side surfaces 1131 of another portion directly intersect with each other, or all adjacent side surfaces 1131 are connected via a connecting surface 1132 . For example: the third side 11313 and the fifth side 11315 are connected by the connecting surface 1132; the third side 11313 and the sixth side 11316 are connected by the connecting surface 1132; the fourth side 11314 and the fifth side 11315 are connected by the connecting surface 1132; the fourth side 11314 and the sixth side 11316 are connected by the connecting surface 1132; the third side 11313, the fourth side 11314, the fifth side 11315, and the sixth side 11316 all directly intersect with the first side 11311 to form an intersection line, and the third side 11313, the fourth side 11314, the fifth side 11315, and the sixth side 11316 all directly intersect with the second side 11312 to form an intersection line.

[0177] At least one connection surface 1132 is covered with the first insulating coating 13. This may mean that a portion of the connection surface 1132 is covered with the first insulating coating 13, while another portion of the connection surface 1132 is not covered with the first insulating coating 13; alternatively, all connection surfaces 1132 are covered with the first insulating coating 13. The connection surface 1132 may be partially or fully covered with the first insulating coating 13. In this way, when all side surfaces 1131 and all connection surfaces 1132 are fully covered with the first insulating coating 13, a fully enclosed insulation design of the battery cell 100 can be achieved, thereby further improving the insulation performance and voltage resistance of the battery cell 100. For example, the battery cell 100 can meet insulation requirements exceeding 5880V.

[0178] By adopting the technical solution of this embodiment, two adjacent side surfaces 1131 are transitionally connected through the connecting surface 1132, which is beneficial to reducing stress concentration and improving the structural strength of the shell 11; at least one connecting surface 1132 is provided with a third insulating coating 25, which increases the insulating area of ​​the battery cell 100, which is beneficial to improving the insulation performance and pressure resistance of the battery cell 100.

[0179] In other embodiments of the present application, referring to Figures 2 and 3, the battery cell 100 also includes an electrode terminal 14 for inputting or outputting electrical energy, the electrode terminal 14 is electrically connected to the electrode assembly 12, and the electrode terminal 14 is connected to the outer shell 11; the first insulating coating 13 is provided with a through hole 131 for the electrode terminal 14 to pass through.

[0180] The through-hole 131 may refer to a through-hole that penetrates the first insulating coating 13. The through-hole 131 is used to provide a space for the electrode terminal 14 to facilitate exposure of the electrode terminal 14. For example, the electrode terminal 14 is provided on the first side 11311, and the first insulating coating 13 covering the first side 11311 is provided with the through-hole 131, through which the electrode terminal 14 extends. Of course, in other embodiments, the electrode terminal 14 may also be provided on the second side 11312, the third side 11313, the fourth side 11314, the fifth side 11315, or the sixth side 11316, etc., and the design can be based on actual needs.

[0181] By adopting the technical solution of this embodiment, the electrode terminal 14 can pass through the through hole 131 to avoid the electrode terminal 14 and facilitate the electrical connection of the electrode terminal 14; the side 1131 of the outer shell 11 where the electrode terminal 14 is provided is also covered with the first insulating coating 13. The coverage area of ​​the first insulating coating 13 is large, which is beneficial to improving the insulation performance of the battery cell 100.

[0182] In some embodiments, the electrode terminal 14 may be disposed on the end cover 111 or on the housing 112 , and the specific location is determined based on actual needs.

[0183] In other embodiments of the present application, referring to FIG. 2 and FIG. 3 , the through holes 131 are arranged in a one-to-one correspondence with the electrode terminals 14 .

[0184] The number of electrode terminals 14 is the same as the number of through-holes 131, with one electrode terminal 14 corresponding to one through-hole 131. For example, two electrode terminals 14 are disposed on the first side surface 11311, and the first insulating coating 13 covering the first side surface 11311 is provided with two through-holes 131, with the two electrode terminals 14 extending through the two through-holes 131, respectively. In other embodiments, the electrode terminals 14 may also be disposed on the second side surface 11312, the third side surface 11313, the fourth side surface 11314, the fifth side surface 11315, or the sixth side surface 11316, etc., and the design may be adapted according to actual needs.

[0185] By adopting the technical solution of this embodiment, the first insulating coating 13 can be filled between the electrode terminals 14, thereby improving the insulation effect between the electrode terminals 14 and increasing the area of ​​the battery cell 100 covered by the first insulating coating 13, which is beneficial to improving the insulation and withstand voltage effect of the battery cell 100.

[0186] In some embodiments, a plurality of electrode terminals 14 are disposed in the same through hole 131 .

[0187] In other embodiments of the present application, referring to FIG. 2 and FIG. 3 , the through hole 131 is provided to be gap-fitted with the electrode terminal 14 .

[0188] The electrode terminal 14 is inserted into the through hole 131 . There is a gap between the outer wall of the electrode terminal 14 and the wall of the through hole 131 . The outer diameter of the electrode terminal 14 may be smaller than the diameter of the through hole 131 .

[0189] By adopting the technical solution of this embodiment, a gap is formed between the electrode terminal 14 and the first insulating coating 13, reducing the risk of the first insulating coating 13 covering the electrode terminal 14, so that the electrode terminal 14 can be well electrically connected to components such as the busbar component, facilitating the output and input of electrical energy by the electrode terminal 14.

[0190] In other embodiments of the present application, referring to FIG. 2 and FIG. 3 , the maximum distance between the hole wall of the through hole 131 and the electrode terminal 14 is L, where 0 mm < L ≤ 3 mm.

[0191] The maximum distance L between the hole wall of the through-hole 131 and the electrode terminal 14 may refer to the maximum distance between the hole wall of the through-hole 131 and the outer peripheral wall of the electrode terminal 14. When the electrode terminal 14 includes an electrode post and an insulating member, the insulating member is wrapped around the electrode post, and the maximum distance between the outer peripheral surface of the insulating member and the hole wall of the through-hole 131 is the maximum distance L between the hole wall of the through-hole 131 and the electrode terminal 14. The through-hole 131 can have various shapes, such as circular, elliptical, polygonal, etc.

[0192] By adopting the technical solution of this embodiment, the design of 0mm<L≤3mm reduces the risk of the first insulating coating 13 covering the electrode terminal 14. At the same time, the maximum distance L between the through hole 131 and the electrode terminal 14 is not too large, so that most of the area of ​​the side 1131 of the housing 11 where the electrode terminal 14 is provided can be covered by the first insulating coating 13, which is beneficial to improving the insulation performance of the side 1131.

[0193] In other embodiments of the present application, referring to FIG. 2 and FIG. 3 , 0.3 mm ≤ L ≤ 2 mm.

[0194] By adopting the technical solution of this embodiment and the design of 0.3 mm ≤ L ≤ 2 mm, the maximum distance L between the through hole 131 and the electrode terminal 14 can be set more reasonably, which can take into account both the insulation performance of the battery cell 100 and the electrical connection of the electrode terminal 14.

[0195] In some embodiments, the value of L may refer to 3 mm or any number between 0 mm and 3 mm. For example, the value of L may be, but is not limited to, 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, or 3 mm.

[0196] In other embodiments of the present application, referring to FIG. 5 , the battery cell 100 is covered with an insulating film 15 .

[0197] The insulating film 15 may refer to a component with insulating properties; the insulating film 15 may be coated on the outside of the battery cell 100 , wherein the insulating film 15 may cover a portion of the battery cell 100 to facilitate exposure of the conductive components of the battery cell 100 .

[0198] For example, referring to Figures 1 and 5 , the insulating film 15 is coated on the second side 11312, third side 11313, fourth side 11314, fifth side 11315, and sixth side 11316 of the battery cell 100, leaving the first side 11311 of the battery cell 100 exposed. This facilitates exposure of the electrode terminals 14 on the first side 11311, thereby facilitating electrical connection of the electrode terminals 14. The insulating film 15 may also cover the entire outer surface 113 of the housing 11, achieving full encapsulation of the insulating film 15.

[0199] The insulating film 15 may be, but is not limited to, a blue film, a polypropylene film, or a polyethylene film.

[0200] The number of layers of the insulating film 15 covering the battery cell 100 may be one layer or multiple layers, which can be set according to actual insulation requirements.

[0201] By adopting the technical solution of this embodiment, the insulating film 15 can improve the insulation performance of the battery cell 100, so that the insulation and withstand voltage performance of the battery cell 100 is better.

[0202] In some other embodiments of the present application, the first insulating coating 13 includes at least one of a first resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

[0203] The first resin coating layer may refer to a coating layer formed by coating a resin material on the outer surface 113 of the housing 11. The resin material may be, but is not limited to, a photosensitive resin, an epoxy resin, or the like.

[0204] The mica coating may refer to a coating made by coating a mica material on the outer surface 113 of the housing 11 .

[0205] The ceramic coating may refer to a coating formed by coating a ceramic material on the outer surface 113 of the housing 11 .

[0206] The organic silicon aluminum powder coating may refer to a coating obtained by coating the outer surface 113 of the housing 11 with organic silicon aluminum powder.

[0207] The glass coating layer may refer to a coating layer formed by coating a glass material on the outer surface 113 of the housing 11 .

[0208] In a possible implementation, the first insulating coating 13 may be any one of a first resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

[0209] Among them, the first resin coating has the ability to resist instantaneous high-temperature impact, so that when thermal runaway does not spread, the first resin coating can withstand the instantaneous high-temperature impact without being damaged. At this time, the battery cell 100 still has good insulation performance, which is beneficial to improving the insulation reliability of the battery 1100; in addition, the first resin coating has good heat conduction performance, which can facilitate heat exchange of the battery cell 100.

[0210] Mica coating, mica coating, ceramic coating, organosilicon aluminum powder coating and glass coating have good high temperature resistance, so that when thermal runaway does not spread, the first resin coating can withstand instantaneous high temperature impact without damage. At this time, the battery cell 100 still has good insulation performance, which is beneficial to improving the insulation reliability of the battery 1100.

[0211] In another possible embodiment, the first insulating coating 13 may include two, three, four or five of the first resin coating, mica coating, ceramic coating, organosilicon aluminum powder coating and glass coating, so that the first insulating coating 13 has a multi-layer structure; in the first insulating coating 13, the material of each coating may be different, or the material of some coatings may be the same, and the specific setting can be made according to actual needs.

[0212] By adopting the technical solution of this embodiment, the first insulating coating 13 has a good insulation effect. In addition, the first insulating coating 13 is not easily damaged when thermal runaway does not spread, which is beneficial to improving the insulation reliability of the battery cell 100. Moreover, the structure of the first insulating coating 13 can be flexibly selected to meet different usage requirements.

[0213] In some other embodiments of the present application, the first insulating coating 13 includes a first resin coating, and the first resin coating includes a photosensitive resin coating.

[0214] The first resin coating is a photosensitive resin coating, which may be a coating made by coating the outer surface 113 of the housing 11 with a photosensitive resin material. The photosensitive resin material may be, but is not limited to, an acrylate resin or a photoimageable alkali-soluble resin.

[0215] By adopting the technical solution of this embodiment, the photosensitive resin can be quickly cured to form a photosensitive resin coating after being irradiated by ultraviolet rays, which is beneficial to reducing the preparation time of the first insulating coating 13 and reducing the production cost of the battery cell 100.

[0216] In some other embodiments of the present application, the photosensitive resin coating layer includes at least one of an epoxy acrylate layer, a polyurethane acrylate resin layer, a polyester acrylate resin layer, an amino acrylate resin layer, and a photoimageable alkali-soluble resin layer.

[0217] The epoxy acrylate layer may refer to a coating structure made using epoxy acrylate.

[0218] The polyester acrylic resin layer may refer to a coating structure made using polyester acrylic resin.

[0219] The urethane acrylic resin layer may refer to a coating structure made using urethane acrylic resin.

[0220] The amino acrylic resin layer may refer to a coating structure made using amino acrylic resin.

[0221] The photoimageable alkali-soluble resin layer may refer to a coating structure made using a photoimageable alkali-soluble resin.

[0222] In one possible embodiment, the photosensitive resin coating can be any one of an epoxy acrylate layer, a polyurethane acrylic resin layer, a polyester acrylic resin layer, an amino acrylic resin layer and a photo-imaging alkali-soluble resin layer, so that the photosensitive resin coating can be a single-layer structure, and the photosensitive resin coating is simple and convenient to manufacture.

[0223] In another possible embodiment, the photosensitive resin coating may include two, three, four or five of the epoxy acrylate layer, the polyurethane acrylate resin layer, the polyester acrylate resin layer, the amino acrylate resin layer and the photo-imaging alkali-soluble resin layer, so that the photosensitive resin coating has a multi-layer structure that can meet different insulation requirements; in the photosensitive resin coating, the material of each coating layer may be different, or the material of at least two coating layers may be the same, and the specific setting can be based on actual needs.

[0224] By adopting the technical solution of this embodiment, the first insulating coating 13 can be quickly cured and formed, which reduces the production time and production cost. In addition, the material of the photosensitive resin coating can be flexibly set to meet different usage requirements.

[0225] In other embodiments of the present application, referring to FIG. 3 and FIG. 4 , the thickness of the first insulating coating 13 ranges from 10 μm to 800 μm.

[0226] It is understood that the thickness of the first insulating coating 13 may refer to the distance between two opposing surfaces of the first insulating coating 13 in the thickness direction. The thickness of the first insulating coating 13 is h1, where 10 μm ≤ h1 ≤ 800 μm. The coating thickness can be measured in various ways, for example, using a handheld film thickness meter.

[0227] By adopting the technical solution of this embodiment, the layer thickness h1 of the first insulating coating 13 is reasonably set, so that the first insulating coating 13 has good insulation performance and the battery cell 100 has good insulation voltage resistance performance; at the same time, the layer thickness h1 of the first insulating coating 13 is not too large, which is beneficial to reducing the production cost of the battery cell 100, improving the heat conduction efficiency, and improving the heat exchange effect of the battery cell 100.

[0228] In other embodiments of the present application, referring to FIG. 3 and FIG. 4 , the thickness of the first insulating coating 13 ranges from 70 μm to 140 μm.

[0229] It can be understood that 70 μm ≤ h1 ≤ 140 μm.

[0230] By adopting the technical solution of this embodiment, the layer thickness h1 of the first insulating coating 13 is set more reasonably, which can better take into account the insulation performance, production cost and heat exchange effect of the first insulating coating 13.

[0231] In some embodiments, the value of h1 may be 10 μm, 800 μm, or any number between 50 μm and 200 μm; for example, the value of h1 may be, but is not limited to, 10 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, 600 μm, 700 μm, and 800 μm.

[0232] In other embodiments of the present application, the conductivity of the first insulating coating 13 is in the range of 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

[0233] It can be understood that the conductivity of the first insulating coating 13 is σ1, where 1.00*10 -18 S / cm≤σ1≤1.00*10-13 S / cm. For example: epoxy resin layer, opaque quartz glass coating, alumina coating, etc. Among them, the conductivity of epoxy resin layer is 3.3*10 -16 S / cm; the conductivity of the opaque quartz glass coating is 3.2*10 -15 S / cm; the conductivity of the aluminum oxide coating is 10 -14 S / cm.

[0234] Conductivity is a physical quantity that describes the electrical conductivity of a component. Conductivity is the ratio of current density per unit length and cross-sectional area to the electric field strength. Lower conductivity indicates poorer conductivity and better insulation. Coating conductivity can be measured using a variety of methods. For example, the volume resistivity of a coating can be determined using the test method described in GB / T 1410. The reciprocal of the volume resistivity is the conductivity.

[0235] By adopting the technical solution of this embodiment, the conductivity σ1 of the first insulating coating 13 is small, and the first insulating coating 13 has good insulation performance, so that the battery cell 100 has good insulation performance; in addition, the conductivity σ1 of the first insulating coating 13 is not too small, so that the first insulating coating 13 can be made of relatively cheap materials, which is beneficial to reducing the production cost of the first insulating coating 13.

[0236] In other embodiments of the present application, the conductivity of the first insulating coating 13 is in the range of 1.00*10 -17 S / cm~1.00*10 -14 S / cm.

[0237] It is understandable that 1.00*10 -17 S / cm≤σ1≤1.00*10 -14 S / cm.

[0238] By adopting the technical solution of this embodiment, the design of the electrical conductivity of the first insulating coating 13 is more reasonable, and the production cost and insulation performance of the first insulating coating 13 can be better taken into account.

[0239] In some embodiments, the value of σ1 may be 1.00*10 -18 S / cm、1.00*10 -13 S / cm or 1.00*10 -18 S / cm~1.00*10 -13 S / cm; for example, the value of σ1 can be but not limited to 1.00*10 -18 S / cm、5.00*10 -18 S / cm、1.00*10 -17 S / cm、5.00*10-17 S / cm、1.00*10 -16 S / cm、5.00*10 -16 S / cm、1.00*10 -15 S / cm、5.00*10 -15 S / cm、1.00*10 -14 S / cm、5.00*10 -14 S / cm、1.00*10 -13 S / cm.

[0240] In other embodiments of the present application, referring to FIG. 6 , a battery 1100 is provided, including the battery cell 100 as described in the above embodiment.

[0241] The battery 1100 of the embodiment of the present application adopts the above-mentioned battery cell 100. The battery cell 100 has good insulation performance and the battery 1100 has good pressure resistance, which is beneficial to improving the reliability of the battery 1100 and can also meet the use requirements of the battery 1100 with higher voltage.

[0242] In some embodiments, the battery 1100 may include one or more battery cells 100 , the specific number of which may be selected according to the capacity of the battery 1100 to meet different usage requirements.

[0243] In the battery 1100 , there may be multiple battery cells 100 , and the multiple battery cells 100 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 100 are connected in both series and in parallel.

[0244] In some embodiments, multiple battery cells 100 can be directly connected in series, parallel, or hybrid, and then the entire battery cell 100 can be housed in the housing 200. Of course, the battery 1100 can also be a battery module formed by first connecting multiple battery cells 100 in series, parallel, or hybrid, and then the multiple battery modules are connected in series, parallel, or hybrid to form an entire battery cell and housed in the housing 200. The battery 1100 can also include other structures, for example, the battery 1100 can also include a busbar component for achieving electrical connection between the multiple battery cells 100.

[0245] In some other embodiments of the present application, referring to FIG. 6 , the battery 1100 further includes a box body 200 , and the battery cells 100 are located in the box body 200 .

[0246] The box body 200 may refer to a shell structure with a hollow interior, and the battery cells 100 are accommodated in the box body 200. The box body 200 is used to provide a receiving space 202 for the battery cells 100, and the box body 200 may adopt various structures.

[0247] For example, the housing 200 may include a first portion 21 and a second portion 22, which cover each other and together define a receiving space 202 for accommodating the battery cells 100. The second portion 22 may be a hollow structure with one end open, and the first portion 21 may be a plate-like structure, with the first portion 21 covering the open side of the second portion 22, so that the first portion 21 and the second portion 22 together define the receiving space 202. The first portion 21 and the second portion 22 may also be hollow structures with one end open, with the open side of the first portion 21 covering the open side of the second portion 22. Of course, the housing 200 formed by the first portion 21 and the second portion 22 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0248] By adopting the technical solution of this embodiment, the box body 200 can protect the battery cell 100, which is beneficial to improving the reliability of the battery 1100.

[0249] In some embodiments, three or more layers of insulation may be provided between the battery cells 100 and the casing 201 of the casing 200, for example, three, four, five, or six layers. The insulation structure may include, but is not limited to, an insulating coating, an insulating film, or an insulating sheet. The greater the number of insulation layers, the better the insulation between the battery cells 100 and the casing 200. The specific number of layers can be selected based on the actual design.

[0250] In some other embodiments of the present application, referring to FIG. 7 to FIG. 9 , the surface of the box body 200 facing the battery cell 100 is covered with a second insulating coating 24 .

[0251] The surface of the box body 200 facing the battery cell 100 may refer to the inner wall surface of the box body 200, and the inner wall surface of the box body 200 is covered with a second insulating coating 24; the box body 200 may include multiple box walls 201, and the box wall 201 may refer to the wall located on one side of the box body 200, for example: the bottom wall, top wall, side wall 222 of the box body 200, etc.

[0252] Multiple box walls 201 are connected and arranged to form a receiving space 202 of the box body 200; the surface of the box wall 201 of the box body 200 facing the battery cell 100 can refer to the inner wall surface of the box wall 201, wherein the second insulating coating 24 can cover the inner wall surface of one box wall 201 of the box body 200, or can cover the inner wall surfaces of multiple box walls 201 of the box body 200, or can cover the inner wall surfaces of all box walls 201 of the box body 200; the second insulating coating 24 of the box can cover a partial area of ​​the inner wall surface of the box wall 201, or can cover the entire inner wall surface of the box wall 201.

[0253] The second insulating coating 24 may be a coating structure having insulating properties. The insulating coating is applied to the surface of the box wall 201 of the box body 200 facing the battery cells 100 to form the second insulating coating 24. For example, the insulating coating 24 may be formed by, but is not limited to, spraying, electrophoresis, or printing. The insulating coating may be made of, but is not limited to, resin or plastic.

[0254] By adopting the technical solution of this embodiment, the second insulating coating 24 can increase the insulation performance between the battery cell 100 and the box body 200, which is beneficial to the insulation performance and pressure resistance of the battery 1100; in addition, the second insulating coating 24 covering the box body 200 can also play an anti-corrosion role, which is beneficial to improving the service life of the box body 200.

[0255] In some embodiments, the battery 1100 may not include the housing 200 , but rather multiple battery cells 100 are electrically connected and formed into a whole through necessary fixing structures before being assembled into an electrical device.

[0256] In some other embodiments of the present application, the battery 1100 further includes an insulating adhesive layer 300 , which is bonded between the second insulating coating layer 24 and the battery cell 100 .

[0257] The insulating adhesive layer 300 may refer to a layer structure formed by an adhesive having insulating properties; the battery cell 100 and the box wall 201 of the box body 200 are bonded together by the adhesive, so that the battery cell 100 and the box body 200 are connected as a whole, which is beneficial to improving the structural strength and modal performance of the battery 1100; the adhesive may be, but is not limited to, a polyurethane adhesive, a silicone rubber adhesive, or an acrylic adhesive.

[0258] The surface of the second insulating coating 24 facing the battery cell 100 is covered with an insulating adhesive layer 300 . The insulating adhesive layer 300 bonds and fixes the surface of the second insulating coating 24 facing the battery cell 100 to the box body 200 .

[0259] By adopting the technical solution of this embodiment, the box body 200 and the battery cell 100 can be insulated and separated by two layers of insulation structure, namely the second insulation coating 24 and the insulating adhesive layer 300, which can increase the insulation performance between the battery cell 100 and the box body 200, and is beneficial to the insulation performance and pressure resistance performance of the battery 1100.

[0260] In some other embodiments of the present application, the second insulating coating 24 includes at least one of a second resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

[0261] The second resin coating layer may refer to a coating layer formed by coating a resin material on the surface of the box wall 201 of the box body 200 facing the battery cell 100. The resin material may be, but is not limited to, a photosensitive resin or an epoxy resin.

[0262] In a possible implementation, the second insulating coating 24 may be any one of a second resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

[0263] Among them, the second resin coating has the ability to resist instantaneous high-temperature impact, so that when thermal runaway does not spread, the second resin coating can withstand the instantaneous high-temperature impact without being damaged. At this time, the box body 200 still has good insulation performance, which is beneficial to improving the insulation reliability of the battery 1100; in addition, the second resin coating has good heat conduction performance, which can facilitate heat exchange between the battery cell 100 and the box wall 201 of the box body 200.

[0264] The mica coating, mica coating, ceramic coating, organosilicon aluminum powder coating and glass coating have good high temperature resistance, so that when thermal runaway does not spread, the second resin coating can withstand instantaneous high temperature impact without being damaged. At this time, the box body 200 still has good insulation performance, which is beneficial to improving the insulation reliability of the battery 1100.

[0265] In another possible embodiment, the second insulating coating 24 may include two, three, four or five of the second resin coating, mica coating, ceramic coating, organosilicon aluminum powder coating, and glass coating, so that the second insulating coating 24 has a multi-layer structure; in the second insulating coating 24, the material of each coating may be different, or the material of some coatings may be the same, and the specific setting can be based on actual needs.

[0266] By adopting the technical solution of this embodiment, the second insulating coating 24 has a good insulation effect. In addition, the second insulating coating 24 is not easily damaged when thermal runaway does not spread, which is beneficial to improving the insulation reliability of the battery 1100; the second insulating coating 24 can be flexibly selected to meet different usage requirements.

[0267] In some other embodiments of the present application, the second insulating coating layer 24 includes a second resin coating layer, and the second resin coating layer includes at least one of an epoxy resin layer, an acrylic resin layer, a polybutadiene resin layer, and a polyurethane resin layer.

[0268] The epoxy resin layer may refer to a coating structure made using epoxy resin.

[0269] The acrylic resin layer may refer to a coating structure made using acrylic resin.

[0270] The polybutadiene resin layer may refer to a coating structure made using polybutadiene resin.

[0271] The polyurethane resin layer may refer to a coating structure made using polyurethane resin.

[0272] In a possible embodiment, the second resin coating can be any one of an epoxy resin layer, an acrylic resin layer, a polybutadiene resin layer and a polyurethane resin layer, so that the second resin coating can be a single-layer structure, and the second resin coating is simple and convenient to manufacture.

[0273] In another possible embodiment, the second resin coating may include two, three or four of an epoxy resin layer, an acrylic resin layer, a polybutadiene resin layer and a polyurethane resin layer, so that the second resin coating has a multi-layer structure to meet different insulation requirements; in the second resin coating, the material of each coating may be different, or the material of some coatings may be the same, and the specific setting can be based on actual needs.

[0274] By adopting the technical solution of this embodiment, the material of the second resin coating can be flexibly set to meet different usage requirements.

[0275] In some embodiments, referring to FIG. 9 , the second insulating coating layer 24 has a thickness ranging from 10 μm to 60 μm.

[0276] It can be understood that the thickness of the second insulating coating 24 may refer to the distance between two opposite surfaces of the second insulating coating 24 in the thickness direction; the thickness of the second insulating coating 24 is h2, wherein 10 μm≤h2≤60 μm.

[0277] By adopting the technical solution of this embodiment, the layer thickness h2 of the second insulating coating 24 is reasonably set, so that the second insulating coating 24 has good insulation performance and the insulation performance of the box 200 is good; at the same time, the layer thickness h2 of the second insulating coating 24 is not too large, which is beneficial to reducing the production cost of the box 200.

[0278] In some embodiments, referring to FIG. 9 , the second insulating coating layer 24 has a thickness ranging from 20 μm to 40 μm.

[0279] It can be understood that 20 μm ≤ h2 ≤ 40 μm.

[0280] By adopting the technical solution of this embodiment, the thickness of the second insulating coating 24 is set more reasonably, which can better take into account the insulation performance, production cost and heat exchange effect of the second insulating coating 24.

[0281] In some embodiments, the value of h2 may be 10 μm, 60 μm, or any number between 10 μm and 60 μm; for example, the value of h2 may be, but is not limited to, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, or 60 μm.

[0282] In some embodiments, the electrical conductivity of the second insulating coating 24 is in the range of 1.00*10 -17 S / cm~1.00*10 -13 S / cm.

[0283] It is understood that the conductivity of the second insulating coating 24 is σ2, where 1.00*10 -17 S / cm≤σ2≤1.00*10 -13 S / cm.

[0284] By adopting the technical solution of this embodiment, the electrical conductivity σ2 of the second insulating coating 24 is small, and the second insulating coating 24 has good insulation performance, so that the box 200 has good insulation performance; in addition, the electrical conductivity σ2 of the second insulating coating 24 is not too small, so that the second insulating coating 24 can be made of relatively cheap materials, which is beneficial to reducing the production cost of the second insulating coating 24.

[0285] In some embodiments, the electrical conductivity of the second insulating coating 24 is in the range of 1.00*10 -16 S / cm~1.00*10 -14 S / cm.

[0286] It is understandable that 1.00*10 -16 S / cm≤σ2≤1.00*10 -14 S / cm.

[0287] By adopting the technical solution of this embodiment, the design of the conductivity σ2 of the second insulating coating 24 is more reasonable, which can better balance the production cost and insulation performance of the second insulating coating 24.

[0288] In some embodiments, the value of σ2 may be 1.00*10 -17 S / cm、1.00*10 -13 S / cm or 1.00*10 -13 S / cm~1.00*10 -13 S / cm; for example, the value of σ2 can be but not limited to 1.00*10 -17 S / cm、5.00*10 -17 S / cm、1.00*10 -16 S / cm、5.00*10-16 S / cm、1.00*10 -15 S / cm、5.00*10 -15 S / cm、1.00*10 -14 S / cm、5.00*10 -14 S / cm、1.00*10 -13 S / cm.

[0289] In some other embodiments of the present application, referring to FIG. 9 , the surface of the second insulating coating 24 facing the battery cell 100 is covered with a third insulating coating 25 .

[0290] The third insulating coating 25 may be a coating structure having insulating properties. The insulating coating is applied to the surface of the second insulating coating 24 facing the battery cell 100 to form the third insulating coating 25. The second insulating coating 24 is located between the third insulating coating 25 and the wall 201 of the housing 200. For example, the insulating coating 25 may be formed by, but is not limited to, spraying, electrophoresis, or printing. The insulating coating may be made of, but is not limited to, resin or plastic.

[0291] By adopting the technical solution of this embodiment, the second insulating coating 24 and the third insulating coating 25 are located between the battery cell 100 and the box wall 201 of the box body 200, and two layers of insulation can be achieved between the battery cell 100 and the box body 200. The insulation and pressure resistance performance between the battery cell 100 and the box body 200 is good, which is beneficial to the insulation performance and pressure resistance performance of the battery 1100; in addition, the connection strength between the second insulating coating 24 and the third insulating coating 25 is good, so that the insulation reliability between the box body 200 and the battery cell 100 is good, which is beneficial to improving the insulation reliability of the battery 1100.

[0292] In some other embodiments of the present application, the third insulating coating 25 includes at least one of a third resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

[0293] The third resin coating layer may refer to a coating layer formed by coating a resin material on the surface of the second insulating coating layer 24 facing the battery cell 100. The resin material may be, but is not limited to, a photosensitive resin or an epoxy resin.

[0294] In a possible implementation, the third insulating coating 25 may be any one of a third resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

[0295] Among them, the third resin coating has the ability to resist instantaneous high-temperature impact, so that when thermal runaway does not spread, the third resin coating can withstand the instantaneous high-temperature impact without being damaged. At this time, the box body 200 still has good insulation performance, which is beneficial to improving the insulation reliability of the battery 1100; in addition, the third resin coating has good heat conduction performance, which can facilitate heat exchange between the battery cell 100 and the box wall 201 of the box body 200.

[0296] The mica coating, mica coating, ceramic coating, organosilicon aluminum powder coating and glass coating have good high temperature resistance, so that when thermal runaway does not spread, the third resin coating can withstand instantaneous high temperature impact without being damaged. At this time, the box body 200 still has good insulation performance, which is beneficial to improving the insulation reliability of the battery 1100.

[0297] In another possible embodiment, the third insulating coating 25 may include two, three, four or five of a third resin coating, a mica coating, a ceramic coating, an organosilicon aluminum powder coating, and a glass coating, so that the third insulating coating 25 has a multi-layer structure; in the third insulating coating 25, the material of each coating may be different, or the material of some coatings may be the same, and the specific setting can be made according to actual needs.

[0298] By adopting the technical solution of this embodiment, the third insulating coating 25 has a good insulation effect. In addition, the third insulating coating 25 is not easily damaged when thermal runaway does not spread, which is beneficial to improving the insulation reliability of the battery 1100; the third insulating coating 25 can be flexibly selected to meet different usage requirements.

[0299] In some other embodiments of the present application, the third insulating coating layer 25 includes a third resin coating layer, and the third resin coating layer includes at least one of an epoxy resin layer, a phenolic resin layer, an acrylic resin layer, a melamine formaldehyde resin layer, and a silicone resin layer.

[0300] The phenolic resin layer may refer to a coating structure made using phenolic resin.

[0301] The acrylic resin layer may refer to a coating structure made using acrylic resin.

[0302] The melamine formaldehyde resin layer may refer to a coating structure made using melamine formaldehyde resin.

[0303] The organic silicone resin layer may refer to a coating structure made using organic silicone resin.

[0304] In a possible embodiment, the third resin coating can be any one of an epoxy resin layer, a phenolic resin layer, an acrylic resin layer, a melamine formaldehyde resin layer and a silicone resin layer, so that the third resin coating can be a single-layer structure, and the third resin coating is simple and convenient to manufacture.

[0305] In another possible embodiment, the third resin coating may include two, three, four or five of the epoxy resin layer, the phenolic resin layer, the acrylic resin layer, the melamine formaldehyde resin layer and the silicone resin layer, so that the third resin coating has a multi-layer structure to meet different insulation requirements; in the third resin coating, the material of each coating may be different, or the material of some coatings may be the same, and the specific setting can be based on actual needs.

[0306] By adopting the technical solution of this embodiment, the material of the third resin coating layer can be flexibly set to meet different usage requirements.

[0307] In some embodiments, referring to FIG. 9 , the thickness of the third insulating coating layer 25 ranges from 60 μm to 700 μm.

[0308] It can be understood that the thickness of the third insulating coating 25 may refer to the distance between two opposite surfaces of the third insulating coating 25 in the thickness direction; the thickness of the third insulating coating 25 is h3, wherein 60 μm≤h3≤700 μm.

[0309] By adopting the technical solution of this embodiment, the layer thickness h3 of the third insulating coating 25 is reasonably set, so that the third insulating coating 25 has good insulation performance and the insulation performance of the box 200 is good; at the same time, the layer thickness h3 of the third insulating coating 25 is not too large, which is beneficial to reducing the production cost of the box 200.

[0310] In some embodiments, referring to FIG. 9 , the thickness of the third insulating coating layer 25 ranges from 140 μm to 450 μm.

[0311] It can be understood that 140 μm ≤ h3 ≤ 450 μm.

[0312] By adopting the technical solution of this embodiment, the layer thickness h3 of the third insulating coating 25 is set more reasonably, which can better take into account the insulation performance, production cost and heat exchange effect of the third insulating coating 25 at the same time.

[0313] In some embodiments, the value of h3 may be 60 μm, 700 μm, or any number between 60 μm and 700 μm; for example, the value of h3 may be, but is not limited to, 60 μm, 100 μm, 140 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, 600 μm, or 700 μm.

[0314] In some embodiments, the electrical conductivity of the third insulating coating 25 is in the range of 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

[0315] It can be understood that the electrical conductivity of the third insulating coating 25 is σ3, where 1.00*10 -18 S / cm≤σ3≤1.00*10 -13 S / cm.

[0316] By adopting the technical solution of this embodiment, the electrical conductivity σ3 of the third insulating coating 25 is small, and the third insulating coating 25 has good insulation performance, so that the box 200 has good insulation performance; in addition, the electrical conductivity σ3 of the third insulating coating 25 is not too small, so that the third insulating coating 25 can be made of relatively cheap materials, which is beneficial to reducing the production cost of the third insulating coating 25.

[0317] In some embodiments, the electrical conductivity of the third insulating coating 25 is in the range of 1.00*10 -17 S / cm~1.00*10 -14 S / cm.

[0318] It is understandable that 1.00*10 -17 S / cm≤σ3≤1.00*10 -14 S / cm.

[0319] By adopting the technical solution of this embodiment, the design of the conductivity σ3 of the third insulating coating 25 is more reasonable, which can better balance the production cost and insulation performance of the third insulating coating 25.

[0320] In some embodiments, the value of σ3 may be 1.00*10 -18 S / cm、1.00*10 -13 S / cm or 1.00*10 -18 S / cm~1.00*10 -13 S / cm; for example, the value of σ3 can be but not limited to 1.00*10 -18 S / cm、5.00*10 -18 S / cm、1.00*10 -17 S / cm、5.00*10 -17 S / cm、1.00*10 -16 S / cm、5.00*10 -16 S / cm、1.00*10 -15 S / cm、5.00*10 -15 S / cm、1.00*10 -14 S / cm、5.00*10 -14 S / cm、1.00*10 -13 S / cm.

[0321] In some embodiments, the thermal conductivity of the third insulating coating layer 25 ranges from 0.1 W / (m·K) to 1.5 W / (m·K).

[0322] Thermal conductivity is the ratio of the amount of heat conducted through a material per unit time and per unit temperature gradient, given a unit thickness. Thermal conductivity describes a material's ability to transfer heat, specifically the amount of heat transferred per unit area per unit time. There are various methods for measuring thermal conductivity, for example, the test methods outlined in ISO 22007-2.

[0323] The thermal conductivity of the third insulating coating 25 is k, where 0.1 W / (m·K) ≤ k ≤ 1.5 W / (m·K). For example, an acrylic resin layer or an epoxy resin layer may have a thermal conductivity ranging from 0.15 W / (m·K) to 0.25 W / (m·K), and an epoxy resin layer may have a thermal conductivity ranging from 0.2 W / (m·K) to 1.5 W / (m·K).

[0324] By adopting the technical solution of this embodiment, the thermal conductivity coefficient k of the third insulating coating 25 is reasonably set, which can better meet the heat exchange requirements between the battery cell 100 and the box body 200; in addition, a relatively low-cost material can be selected to make the third insulating coating 25, which can take into account both the heat exchange requirements of the battery cell 100 and the production cost of the box body 200.

[0325] In some embodiments, the thermal conductivity of the third insulating coating layer 25 ranges from 0.3 W / (m·K) to 1 W / (m·K).

[0326] It can be understood that 0.3 W / (m·K)≤k≤1 W / (m·K).

[0327] By adopting the technical solution of this embodiment, the heat exchange requirements between the battery cell 100 and the box body 200 and the manufacturing cost of the box body 200 can be better taken into account.

[0328] In some embodiments, the value of k can be 0.1 W / (m·K), 1.5 W / (m·K) or any number between 0.1 W / (m·K) and 1.5 W / (m·K); for example, the value of k can be, but is not limited to, 0.1 W / (m·K), 0.2 W / (m·K), 0.3 W / (m·K), 0.4 W / (m·K), 0.5 W / (m·K), 0.6 W / (m·K), 0.7 W / (m·K), 0.8 W / (m·K), 0.9 W / (m·K), 1 W / (m·K), 1.1 W / (m·K), 1.2 W / (m·K), 1.3 W / (m·K), 1.4 W / (m·K), and 1.5 W / (m·K).

[0329] In other embodiments of the present application, referring to FIG. 9 , the battery 1100 further includes an insulating adhesive layer 300 , which is bonded between the third insulating coating layer 25 and the battery cell 100 .

[0330] The surface of the second insulating coating 24 facing the battery cell 100 is covered with a third insulating coating 25 . The surface of the third insulating coating 25 facing the battery cell 100 is covered with an insulating adhesive layer 300 . The battery cell 100 is bonded and fixed to the box 200 via the insulating adhesive layer 300 .

[0331] By adopting the technical solution of this embodiment, the box body 200 and the battery cell 100 can be insulated and separated by a three-layer insulation structure of the second insulating coating 24, the third insulating coating 25 and the insulating adhesive layer 300, so that the box body 200 and the battery cell 100 are separated by a multi-layer insulation structure, and the insulation performance and pressure resistance between the box body 200 and the battery cell 100 are good, which is beneficial to improving the insulation and pressure resistance reliability and usage reliability of the battery 1100; in addition, the insulating adhesive layer 300 can bond the battery cell 100 and the box body 200, so that the battery cell 100 and the box body 200 are connected into a whole, which is beneficial to improving the structural strength and modal performance of the battery 1100.

[0332] In some embodiments, referring to FIG. 9 , the thickness of the insulating adhesive layer 300 ranges from 500 μm to 3000 μm.

[0333] It is understood that the thickness of the insulating adhesive layer 300 may refer to the distance between two opposite surfaces of the insulating adhesive layer 300 in the thickness direction; the thickness of the insulating adhesive layer 300 is h4, wherein 500 μm≤h4≤3000 μm.

[0334] When the two opposite surfaces of the insulating adhesive layer 300 in the thickness direction are planes, h4 is equal to the distance between the two planes; when at least one of the two opposite surfaces of the insulating adhesive layer 300 in the thickness direction is concave or convex, h4 is equal to the distance between the two surfaces in the plane area.

[0335] By adopting the technical solution of this embodiment, the layer thickness h4 of the insulating adhesive layer 300 is reasonably set, so that the insulating adhesive layer 300 has good insulation performance, and the insulation performance between the battery cell 100 and the box body 200 is good; the insulating adhesive layer 300 can also better stably bond the box body 200 and the battery cell 100 together; in addition, the layer thickness h4 of the insulating adhesive layer 300 is not too large, which is beneficial to reducing the production cost of the box body 200.

[0336] In some embodiments, referring to FIG. 9 , the thickness of the insulating adhesive layer 300 ranges from 700 μm to 1500 μm.

[0337] It can be understood that 700 μm ≤ h4 ≤ 1500 μm.

[0338] By adopting the technical solution of this embodiment, the thickness h4 of the insulating adhesive layer 300 is set more reasonably, which can better take into account the insulation and bonding fixation between the battery cell 100 and the box body 200 and the production cost of the battery 1100.

[0339] In some embodiments, the value of h4 may be 500 μm, 3000 μm, or any number between 500 μm and 3000 μm; for example, the value of h4 may be, but is not limited to, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm, 1100 μm, 1200 μm, 1300 μm, 1400 μm, 1500 μm, 1800 μm, 2000 μm, 2500 μm, or 3000 μm.

[0340] In some embodiments, the conductivity of the insulating adhesive layer 300 is in the range of 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

[0341] It is understood that the electrical conductivity of the insulating adhesive layer 300 is σ4, where 1.00*10 -18 S / cm≤σ4≤1.00*10 -13 S / cm.

[0342] By adopting the technical solution of this embodiment, the electrical conductivity σ4 of the insulating adhesive layer 300 is small, and the insulating adhesive layer 300 has good insulation performance, so that good insulation performance is achieved between the battery cell 100 and the box body 200; in addition, the electrical conductivity σ4 of the insulating adhesive layer 300 is not too small, so that the insulating adhesive layer 300 can be made of relatively cheap materials, which is beneficial to reducing the production cost of the insulating adhesive layer 300.

[0343] In some embodiments, the conductivity of the insulating adhesive layer 300 is in the range of 5.00*10 -16 S / cm~1.00*10 -14 S / cm.

[0344] It is understandable that 5.00*10 -16 S / cm≤σ4≤1.00*10 -14 S / cm.

[0345] By adopting the technical solution of this embodiment, the design of the conductivity σ4 of the insulating adhesive layer 300 is more reasonable, which can better balance the production cost and insulation performance of the insulating adhesive layer 300.

[0346] In some embodiments, the value of σ4 may be 1.00*10 -18 S / cm、1.00*10 -13 S / cm or 1.00*10 -18 S / cm~1.00*10 -13 S / cm; for example, the value of σ4 can be but not limited to 1.00*10 -18 S / cm、5.00*10 -18 S / cm、1.00*10 -17 S / cm、5.00*10 -17 S / cm、1.00*10 -16 S / cm、5.00*10 -16 S / cm、1.00*10 -15 S / cm、5.00*10 -15 S / cm、1.00*10 -14 S / cm、5.00*10 -14 S / cm、1.00*10 -13 S / cm.

[0347] In other embodiments of the present application, referring to FIG. 9 and FIG. 12 , the battery 1100 further includes an insulating strip 400 , which is embedded in the insulating adhesive layer 300 .

[0348] The insulating strip 400 may be a strip-shaped component with insulating properties. The insulating strip 400 is made of an insulating material, such as rubber or plastic. There may be one or more insulating strips 400. For example, multiple insulating strips 400 may be evenly spaced along a direction or formed into a mesh structure to better support the battery cells 100.

[0349] The insulating strip 400 is embedded in the insulating adhesive layer 300, and the insulating strip 400 is located inside the insulating adhesive layer 300; for example, the surface of the insulating strip 400 facing the battery cell 100 may be flush with the surface of the insulating adhesive layer 300 facing the battery cell 100, or the surface of the insulating strip 400 facing away from the battery cell 100 may be flush with the surface of the insulating adhesive layer 300 facing away from the battery cell 100; or the insulating adhesive layer 300 may completely cover the insulating strip 400.

[0350] By adopting the technical solution of this embodiment, the battery cell 100 and the box body 200 can be insulated and separated by the insulating strip 400, which is beneficial to improving the insulation pressure resistance performance between the battery cell 100 and the box body 200 and improving the reliability of the battery 1100; in addition, the size of the insulating strip 400 can be used to control the thickness of the insulating adhesive layer 300, which facilitates the connection between the battery cell 100 and the box body 200, and can also reduce the amount of glue applied, thereby reducing production costs.

[0351] In other embodiments of the present application, referring to Figures 9 to 11, the insulating adhesive layer 300 includes an adhesive portion 31, and an adhesive portion 31 is provided between the insulating strip 400 and the battery cell 100; and / or, an adhesive portion 31 is provided between the insulating strip 400 and the third insulating coating 25.

[0352] The bonding portion 31 may refer to a portion of the insulating adhesive layer 300 located between the insulating strip 400 and the battery cell 100 , or may refer to a portion of the insulating adhesive layer 300 located between the insulating strip 400 and the third insulating coating layer 25 .

[0353] In one possible embodiment, referring to FIG10 , the insulating adhesive layer 300 includes an adhesive portion 31 , and an adhesive portion 31 is provided between the insulating strip 400 and the battery cell 100 , so that the box wall 201 of the box body 200 and the battery cell 100 can be insulated and separated by the adhesive portion 31 , the insulating strip 400 , the third insulating coating 25 and the second insulating coating 24 . The insulation withstand voltage performance between the battery cell 100 and the box body 200 is better, and can meet the use requirements of higher voltages. For example, the insulation withstand voltage performance of the box body 200 can reach above 5880V, and the battery 1100 can also meet the use requirements of devices with a voltage above 1500V.

[0354] In another possible embodiment, referring to FIG9 , an adhesive portion 31 is provided between the insulating strip 400 and the third insulating coating 25 , so that the box wall 201 of the box body 200 and the outer shell 11 of the battery cell 100 can be insulated and separated by the insulating strip 400 , the adhesive portion 31 , the third insulating coating 25 and the second insulating coating 24 . The insulation withstand voltage performance between the battery cell 100 and the box body 200 is better, and can meet the use requirements of higher voltages. For example, the insulation withstand voltage performance of the box body 200 can reach above 5880V, and the battery 1100 can also meet the use requirements of devices with a voltage above 1500V.

[0355] In another possible embodiment, referring to Figure 11, the insulating adhesive layer 300 includes an adhesive portion 31, and an adhesive portion 31 is provided between the insulating strip 400 and the battery cell 100; an adhesive portion 31 is provided between the insulating strip 400 and the third insulating coating 25, so that the box wall 201 of the box body 200 and the battery cell 100 can be insulated and separated by the adhesive portion 31, the insulating strip 400, the adhesive portion 31, the third insulating coating 25 and the second insulating coating 24, and the insulation withstand voltage performance between the battery cell 100 and the box body 200 is better, which can meet the use requirements of higher voltage.

[0356] By adopting this technical solution, the adhesive portion 31 can further increase the insulation voltage resistance performance between the battery cell 100 and the box body 200, which is beneficial for the battery 1100 to meet the use of higher voltage devices; in addition, the adhesive portion 31 can fix the insulating strip 400, which is beneficial for improving the insulation reliability between the battery cell 100 and the box body 200.

[0357] In some embodiments, as shown in FIG. 9 , in a direction from the battery cell 100 toward the second insulating coating 24 , the size of the insulating strip 400 ranges from 0.5 mm to 1.8 mm.

[0358] In the direction from the battery cell 100 to the second insulating coating 24 , the size of the insulating strip 400 may refer to the thickness of the insulating strip 400 ; for example, the direction from the battery cell 100 to the second insulating coating 24 may be the Z direction in FIG. 9 .

[0359] In a direction from the battery cell 100 toward the second insulating coating 24 , the dimension of the insulating strip 400 is h5 , wherein 0.5 mm≦h5≦1.8 mm.

[0360] By adopting the technical solution of this embodiment, the size h5 of the insulating strip 400 is reasonably set, so that the battery cell 100 and the box body 200 have a certain insulation distance, and the insulation performance between the battery cell 100 and the box body 200 is good; in addition, the size h5 of the insulating strip 400 is not too large, which is conducive to reducing the production cost of the box body 200.

[0361] In some embodiments, as shown in FIG. 9 , in a direction from the battery cell 100 toward the second insulating coating 24 , a size of the insulating strip 400 ranges from 0.6 mm to 1.4 mm.

[0362] It can be understood that 0.6mm≤h5≤1.4mm.

[0363] By adopting the technical solution of this embodiment, the size h5 of the insulating strip 400 is reasonably set, which can better take into account the insulation between the battery cell 100 and the box body 200 and the production cost of the battery 1100.

[0364] In some embodiments, the value of h5 can be 0.5 mm, 1.8 mm, or any number between 0.5 mm and 1.8 mm; for example, the value of h5 can be but is not limited to 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, and 1.8 mm.

[0365] In some embodiments, the conductivity of the insulating strip 400 is in the range of 1.00*10 -15S / cm~1.00*10 -11 S / cm.

[0366] It is understood that the conductivity of the insulating strip 400 is σ5, where 1.00*10 -15 S / cm≤σ5≤1.00*10 -11 S / cm.

[0367] By adopting the technical solution of this embodiment, the electrical conductivity σ5 of the insulating strip 400 is small, and the insulating strip 400 has good insulation performance, so that good insulation performance is achieved between the battery cell 100 and the box body 200; in addition, the electrical conductivity σ5 of the insulating strip 400 is not too small, so that the insulating strip 400 can be made of relatively cheap materials, which is beneficial to reducing the production cost of the insulating strip 400.

[0368] In some embodiments, the conductivity of the insulating strip 400 is in the range of 1.00*10 -14 S / cm~1.00*10 -12 S / cm.

[0369] It is understandable that 1.00*10 -14 S / cm≤σ5≤1.00*10 -12 S / cm.

[0370] By adopting the technical solution of this embodiment, the design of the conductivity σ5 of the insulating strip 400 is more reasonable, which can better balance the production cost and insulation performance of the insulating strip 400.

[0371] In some embodiments, the value of σ5 may be 1.00*10 -15 S / cm、1.00*10 -11 S / cm or 1.00*10 -15 S / cm~1.00*10 -11 S / cm; for example, the value of σ5 can be but not limited to 1.00*10 -15 S / cm、5.00*10 -15 S / cm、1.00*10 -16 S / cm、5.00*10 -16 S / cm、1.00*10 -15 S / cm、5.00*10 -15 S / cm、1.00*10 -14 S / cm、5.00*10 -14 S / cm、1.00*10 -13 S / cm、5.00*10 -13 S / cm、1.00*10 -12S / cm、5.00*10 -12 S / cm、1.00*10 -11 S / cm.

[0372] In some other embodiments of the present application, referring to FIG. 9 , the surface of the housing 11 facing the second insulating coating 24 is covered with a first insulating coating 13 .

[0373] By adopting this technical solution, the first insulating coating 13 can increase the insulation withstand voltage performance between the battery cell 100 and the box body 200, which is beneficial for the battery 1100 to be used in devices with higher voltages.

[0374] In some embodiments, the box wall 201 of the box body 200 and the outer shell 11 of the battery cell 100 can be insulated and separated by a five-layer insulation structure including a first insulating coating 13, an adhesive portion 31, an insulating strip 400, a third insulating coating 25 and a second insulating coating 24. The insulation withstand voltage performance between the battery cell 100 and the box body 200 is better and can meet the requirements of higher voltage use. For example: the insulation withstand voltage performance of the box body 200 can reach above 5880V, and the battery 1100 can also meet the use of devices with a voltage above 1500V.

[0375] In some embodiments, the box wall 201 of the box body 200 and the outer shell 11 of the battery cell 100 can be insulated and separated by a five-layer insulation structure including a first insulating coating 13, an insulating strip 400, an adhesive portion 31, a third insulating coating 25 and a second insulating coating 24. The insulation withstand voltage performance between the battery cell 100 and the box body 200 is better and can meet the requirements of higher voltage use. For example, the insulation withstand voltage performance of the box body 200 can reach above 5880V, and the battery 1100 can also meet the use of devices with a voltage above 1500V.

[0376] In some embodiments, the box wall 201 of the box body 200 and the outer shell 11 of the battery cell 100 can be insulated and separated by a six-layer insulation structure including a first insulating coating 13, an adhesive portion 31, an insulating strip 400, an adhesive portion 31, a third insulating coating 25 and a second insulating coating 24. The insulation withstand voltage performance between the battery cell 100 and the box body 200 is better and can meet the use requirements of higher voltage.

[0377] In other embodiments of the present application, referring to Figures 9 and 12, the box body 200 includes a heat exchange plate 23, the heat exchange plate 23 includes a flow channel for a heat exchange medium to flow so that the heat exchange medium can exchange heat with the battery cell 100, and the surface of the heat exchange plate 23 facing the battery cell 100 is covered with a second insulating coating 24.

[0378] The heat exchange plate 23 is a component capable of exchanging heat with the battery cells 100. A flow channel is provided within the heat exchange plate 23, through which a heat exchange medium flows. This heat exchange medium can remove heat from the battery cells 100, thereby cooling them. The heat exchange medium can also transfer heat to the battery cells 100, thereby heating them. The heat exchange medium can be water, air, coolant, etc. The heat exchange plate 23 can be made of components with good thermal conductivity, such as aluminum or aluminum alloys.

[0379] The heat exchange plate 23 can be integrated into the box body 200, and the heat exchange plate 23 can be a part of the box body 200: for example, the heat exchange plate 23 can be the second part 22 or the first part 21 mentioned above, or the heat exchange plate 23 can be the bottom wall 221 of the second part 22 opposite to the first part 21 or the top wall 211 of the first part 21 opposite to the second part 22; or the heat exchange plate 23 is installed on the bottom wall 221 of the second part 22, and the heat exchange plate 23 is located between the bottom wall 221 of the second part 22 and the battery cell 100. The heat exchange plate 23 and the bottom wall 221 of the second part 22 jointly form the bottom wall of the box body 200; alternatively, the heat exchange plate 23 is installed on the top wall 211 of the first part 21, and the heat exchange plate 23 is located between the top wall 211 of the first part 21 and the battery cell 100, so that the heat exchange plate 23 and the top wall 211 of the first part 21 jointly form the top wall of the box body 200; the second insulating coating 24, the third insulating coating 25, the insulating strip 400 and the insulating adhesive layer 300 can be sequentially arranged on the surface of the heat exchange plate 23 facing the battery cell 100.

[0380] By adopting the technical solution of this embodiment, the heat exchange plate 23 is used to exchange heat for the battery cell 100, which is beneficial to controlling the temperature of the battery cell 100. The heat exchange plate 23 is provided with a second insulating coating 24, which can also insulate the heat exchange plate 23 from the battery cell 100, thereby improving the reliability of the battery 1100.

[0381] In other embodiments of the present application, referring to Figures 9 and 12, the box body 200 includes a first part 21 and a second part 22, the first part 21 and the second part 22 are connected and enclosed to form a receiving space 202, the battery cell 100 is located in the receiving space 202, the second part 22 is used to support the battery cell 100, the second part 22 includes a metal part, and the outer shell 11 includes a metal shell.

[0382] The receiving space 202 may refer to the internal cavity of the box body 200, and the battery cell 100 is located in the receiving space 202. The receiving space 202 provides installation space for the battery cell 100, wherein the first part 21 and the second part 22 cover each other to form the receiving space 202, and the second part 22 can support the battery cell 100; for example, the second part 22 may refer to the part located on the lower side of the box body 200. Of course, in other embodiments, the second part 22 may also refer to the part located on the upper side.

[0383] The second portion 22 is made of a metal material, such as an aluminum alloy, aluminum, or steel; the outer casing 11 is also made of a metal material, such as an aluminum alloy, aluminum, or steel. The first portion 21 can be made of either a metal or non-metallic material. The metal outer casing 11 and the metal second portion 22 are insulated by a multi-layer insulation structure comprising a second insulating coating 24, a third insulating coating 25, an insulating adhesive layer 300, insulating strips 400, and a first insulating coating 13, providing excellent insulation between the battery cells 100 and the casing 200.

[0384] By adopting the technical solution of this embodiment, the second portion 22 of the box body 200 and the outer shell 11 are both made of metal materials, so that the box body 200 and the battery cell 100 have good structural strength, which is conducive to improving the reliability of the battery 1100.

[0385] In some embodiments, the housing 11 and the second portion 22 may also be made of non-metal, such as rubber, plastic, etc.

[0386] In other embodiments of the present application, referring to FIG. 13 , an electrical device is provided, including the battery 1100 as described in the above embodiment.

[0387] An electric device may refer to a device that uses the battery 1100 as a power source; the electric device may include, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0388] The electrical device of the embodiment of the present application adopts the above-mentioned battery 1100. The battery 1100 has good insulation and voltage resistance performance, which is beneficial to improving the reliability of the electrical device and also beneficial to meeting the use requirements of high-voltage electrical devices.

[0389] For convenience of description, the electric device is described as a vehicle 1000 .

[0390] The vehicle 1000 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 battery 1100 is provided inside the vehicle 1000. The battery 1100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 1100 may be used to power the vehicle 1000. For example, the battery 1100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery 1100 to power the motor 1300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0391] In some embodiments of the present application, the battery 1100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0392] In other embodiments of the present application, referring to FIG. 14 , an energy storage device is provided, including the battery 1100 as described in the above embodiments.

[0393] The energy storage device may refer to a device that uses a battery 1100 as an energy storage unit. The energy storage device may be, but is not limited to, an energy storage cabinet or an energy storage container 2000 .

[0394] The energy storage device of the embodiment of the present application utilizes the aforementioned battery 1100. Battery 1100 has excellent insulation and withstand voltage performance, which helps improve the reliability and service life of the energy storage device and also helps meet the requirements of high-voltage energy storage devices. For example, it can meet the requirements of energy storage devices with voltages above 1500V.

[0395] For the convenience of explanation, the energy storage device is taken as an energy storage container 2000 as an example.

[0396] The energy storage container 2000 includes a container 2100 and a battery 1100. The number of batteries 1100 can be one or more. When the number of batteries 1100 is multiple, multiple battery compartments 2200 are formed in the container 2100. One battery compartment 2200 can accommodate one or more batteries 1100. The specific number can be selected according to actual needs.

[0397] In other embodiments of the present application, referring to FIG. 15 and FIG. 16 , a battery cell manufacturing method is provided. The battery cell manufacturing method is used to manufacture the battery cell 100 described in the above embodiment. The battery cell manufacturing method includes:

[0398] Installing the electrode assembly 12 into the housing 11;

[0399] An insulating coating material is applied to at least a portion of the outer surface 113 of the housing 11 to form a first insulating coating layer 13 .

[0400] After the electrode assembly 12 is installed in the housing 11 , an insulating coating is applied to a portion or the entire outer surface 113 of the battery cell 100 to form a first insulating coating 13 .

[0401] The battery cell manufacturing method of the embodiment of the present application places the production of the first insulating coating 13 after the electrode assembly 12 is installed in the outer shell 11, which can avoid damage to the first insulating coating 13 caused by the electrode assembly 12 being installed in the outer shell 11, which is beneficial to improving the yield of the battery cell 100 and reducing the production cost of the battery cell 100.

[0402] In other embodiments of the present application, referring to FIG. 15 and FIG. 16 , preparing the first insulating coating 13 includes preparing the first insulating coating 13 by using ultraviolet curing printing technology.

[0403] Ultraviolet (UV) curing printing, also known as UV (ultraviolet) printing, is a digital printing technology that uses ultraviolet light to irradiate the insulating coating, curing it and forming the first insulating coating 13. During the printing process, a UV printer uses a UV curing system to rapidly cure and dry the insulating coating, enabling high-speed, high-quality printing of the first insulating coating 13.

[0404] The UV printing technology takes a short time to produce the first insulating coating layer 13 , which is beneficial to shortening the production time of the battery cell 100 and reducing the production cost.

[0405] UV printing technology is set in the post-process of the battery cell 100, that is, the first insulating coating 13 is UV-printed after the electrode assembly 12 is installed in the shell 11. This can reduce the damage to the first insulating coating 13 caused by the assembly operation. The success rate of UV printing in one time can be greater than 95%, and the yield rate of the battery cell 100 is high, which can reduce the production cost of the battery cell 100. In addition, UV printing is also suitable for automated, intelligent, and digital production lines, and does not require recycling modules and waste gas and liquid treatment, which is more environmentally friendly.

[0406] UV printing achieves a utilization rate of over 95% for insulating coatings. This high utilization rate reduces material waste and helps lower the production cost of battery cells 100. UV printing ensures high compliance with zero-carbon factories, eliminates waste, eliminates waste, and is highly energy efficient. UV printing repairs can be laser cleaned and then reprinted, reducing waste and lowering production costs. UV printing requires fewer consumables, such as printheads and LED lights, which helps lower the production cost of battery cells 100. UV printers also take up little space and are easy to use.

[0407] By adopting the technical solution of this embodiment, the first insulating coating 13 can be printed at high speed and high quality using ultraviolet light curing printing technology, which is beneficial to shortening the production time of the battery cell 100, reducing the production cost of the battery cell 100, and is also environmentally friendly; in addition, during the printing process, the information of the battery cell 100 can also be printed on the shell 11, which can eliminate components such as top patches and labels, and is beneficial to reducing the production cost of the battery cell 100; the first insulating coating 13 produced using ultraviolet light curing printing technology has a good connection strength with the shell 11, and the first insulating coating 13 is not easy to fall off, thereby improving the insulation and voltage resistance performance of the battery cell 100.

[0408] In some embodiments, the insulating coating may be sprayed onto the entire area to be sprayed on the outer surface 113 of the housing 11 , and then cured by ultraviolet irradiation, thereby obtaining the first insulating coating 13 in one step.

[0409] In some embodiments, the insulating coating can also be sprayed and cured in different areas; for example, the area to be sprayed on the shell 11 is divided into multiple areas, and then the insulating material is sprayed on one of the areas, and then the area is cured by ultraviolet irradiation, and then the insulating material is sprayed on another area, and this process is repeated back and forth to obtain the first insulating coating 13.

[0410] In other embodiments of the present application, referring to FIG. 15 and FIG. 16 , installing the electrode assembly 12 into the housing 11 includes:

[0411] Install the electrode assembly 12 into the shell 112 from the opening of the shell 112 of the outer shell 11;

[0412] The end cover 111 of the outer shell 11 is covered on the opening of the housing 112 to seal the opening of the housing 112 .

[0413] The outer shell 11 includes a shell 112 and an end cap 111. The shell 112 has an opening. After the electrode assembly 12 is inserted into the shell 112 through the opening of the shell 112, the end cap 111 is then placed on the opening of the shell 112, thereby achieving the packaging of the battery cell 100. The shell 112 and the end cap 111 can be sealed and fixed by welding, bonding, etc. For example, after the end cap 111 is welded to the opening of the shell 112, an insulating coating is sprayed on the outer surface 113 of the outer shell 11 to obtain the first insulating coating 13. Alternatively, when spraying the insulating coating, an area where the end cap 111 and the shell 112 need to be welded is reserved, and then the end cap 111 and the shell 112 are welded. Then, the insulating coating is sprayed on the weld between the end cap 111 and the shell 112 to obtain the first insulating coating 13.

[0414] By adopting the technical solution of this embodiment, the first insulating coating 13 is prepared before the end cover 111 is covered on the opening of the shell 112, which can avoid damage to the first insulating coating 13 during the assembly of the end cover 111 and the shell 112, and is conducive to improving the yield rate of the battery cell 100.

[0415] In some other embodiments of the present application, referring to FIG. 15 and FIG. 16 , after the electrode assembly 12 is installed in the housing 11 and before the insulating coating is applied to at least a portion of the outer surface 113 of the housing 11 , the battery cell manufacturing method further includes:

[0416] Clean at least the area of ​​the outer surface 113 of the housing 11 that needs to be coated with insulating paint;

[0417] And / or, after forming the first insulating coating 13, the battery cell manufacturing method further comprises:

[0418] The insulation and withstand voltage performance of the battery cell 100 is tested to determine whether the battery cell 100 is qualified.

[0419] After the battery cells 100 are packaged, the outer shell 11 can be cleaned either just in the area to be sprayed, or the entire outer surface 113 of the outer shell 11 can be cleaned to remove dust, water, and other debris from the area to be sprayed, thereby improving print quality. For example, laser cleaning, plasma cleaning, or a combination of laser and plasma cleaning can be used. Other cleaning methods are also possible, and the selection can be based on actual needs.

[0420] After the first insulating coating 13 is formed, the battery cells 100 are subjected to an insulation withstand voltage test using insulation withstand voltage testing equipment. The test results are then used to determine whether the battery cells 100 are qualified based on whether they fall within a preset range. This allows the battery cells 100 to be classified as good or bad based on the test results, facilitating subsequent production. The preset range can be determined based on actual needs.

[0421] The insulation and voltage withstand performance tests of the battery cells 100 can be conducted in a variety of ways, for example, by conducting an insulation performance test according to 6.7.1.5.2 of GB / T 36276-2023 and a voltage withstand performance test according to 6.7.1.6.2 of GB / T 36276-2023. The insulation performance test can be conducted before or after the voltage withstand performance test.

[0422] In one possible embodiment, after the electrode assembly 12 is installed in the housing 11 and before the insulating coating is applied to at least a portion of the outer surface 113 of the housing 11 , the battery cell manufacturing method further includes:

[0423] Clean at least the area of ​​the outer surface 113 of the housing 11 that needs to be coated with insulating paint;

[0424] In another possible embodiment, after forming the first insulating coating 13, the battery cell manufacturing method further includes:

[0425] The insulation and withstand voltage performance of the battery cell 100 is tested to determine whether the battery cell 100 is qualified.

[0426] In another possible embodiment, after the electrode assembly 12 is installed in the housing 11 and before the insulating coating is applied to at least a portion of the outer surface 113 of the housing 11, the battery cell manufacturing method further includes:

[0427] Clean at least the area of ​​the outer surface 113 of the housing 11 that needs to be coated with insulating paint;

[0428] After the first insulating coating 13 is prepared, the method further comprises:

[0429] The insulation and withstand voltage performance of the battery cell 100 is tested to determine whether the battery cell 100 is qualified.

[0430] By adopting the technical solution of this embodiment, the manufacturing process of the battery cell 100 can be flexibly selected to meet different usage requirements.

[0431] In some other embodiments of the present application, referring to FIG. 15 and FIG. 16 , the battery cell manufacturing method further includes testing the insulation withstand voltage performance of the battery cell 100. After forming the first insulating coating 13 and before testing the insulation withstand voltage performance of the battery cell 100, the battery cell manufacturing method further includes:

[0432] The layer thickness of the first insulating coating 13 was measured.

[0433] The thickness of the first insulating coating 13 can be measured in various ways, for example, using a handheld film thickness meter.

[0434] By adopting the technical solution of this embodiment, the thickness of the first insulating coating 13 is measured before the insulation withstand voltage test, so as to preliminarily confirm whether the insulation performance of the first insulating coating 13 meets the requirements. In this way, the insulation performance of the first insulating coating 13 can be understood in a timely manner, which is convenient for subsequent insulation withstand voltage performance testing.

[0435] The battery cell 100 is described below with reference to some specific embodiments.

[0436] In this embodiment, referring to Figures 1 to 5, the battery cell 100 includes a shell 11, an electrode assembly 12 and a first insulating coating 13, and the electrode assembly 12 is disposed in the shell 11; wherein, the shell 11 includes an outer surface 113 disposed away from the electrode assembly 12, and at least a portion of the outer surface 113 is covered with the first insulating coating 13.

[0437] In this embodiment, the outer surface 113 includes multiple side surfaces 1131, the multiple side surfaces 1131 include a first side surface 11311, at least the edge area of ​​the first side surface 11311 is covered with a first insulating coating 13, and the other side surfaces 1131 except the first side surface 11311 are covered with a first insulating coating 13, and the first insulating coating 13 covering the first side surface 11311 and the first insulating coating 13 covering the other side surfaces 1131 except the first side surface 11311 are connected.

[0438] In this embodiment, all areas of the outer surface 113 except the first side surface 11311 are covered with the first insulating coating 13 .

[0439] In this embodiment, the battery cell 100 further includes an electrode terminal 14 for inputting or outputting electrical energy. The electrode terminal 14 is disposed on the first side surface 11311 .

[0440] In this embodiment, when the battery cell 100 is in use, the top surface of the housing 11 forms a first side surface 11311 .

[0441] In this embodiment, the outer surface 113 includes a plurality of connected side surfaces 1131, the plurality of side surfaces 1131 include a first side surface 11311 and a second side surface 11312 relatively distributed along a first direction, a third side surface 11313 and a fourth side surface 11314 relatively distributed along a second direction, and a fifth side surface 11315 and a sixth side surface 11316 relatively distributed along a third direction, the first side surface 11311, the second side surface 11312, the third side surface 11313, the fourth side surface 11314, the fifth side surface 11315 and the sixth side surface 11316 are covered with a first insulating coating 13; wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0442] In this embodiment, the outer surface 113 further includes a connecting surface 1132 . At least two adjacent side surfaces 1131 are connected by a connecting surface 1132 . At least one connecting surface 1132 is covered with the first insulating coating 13 .

[0443] In this embodiment, the battery cell 100 also includes an electrode terminal 14 for inputting or outputting electrical energy. The electrode terminal 14 is electrically connected to the electrode assembly 12 and connected to the outer shell 11; the first insulating coating 13 is provided with a through hole 131 for allowing the electrode terminal 14 to pass through.

[0444] In this embodiment, the through hole 131 is provided to be loosely fitted with the electrode terminal 14 .

[0445] In this embodiment, the maximum distance between the hole wall of the through hole 131 and the electrode terminal 14 is L, where 0 mm < L ≤ 3 mm.

[0446] In this embodiment, 0.3 mm ≤ L ≤ 2 mm.

[0447] In this embodiment, the battery cell 100 is covered with an insulating film 15 .

[0448] In this embodiment, the first insulating coating 13 includes at least one of a first resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

[0449] In this embodiment, the first insulating coating 13 includes a first resin coating, and the first resin coating includes a photosensitive resin coating.

[0450] In this embodiment, the photosensitive resin coating layer includes at least one of an epoxy acrylate layer, a polyurethane acrylate layer, a polyester acrylate layer, an amino acrylate layer, and a photoimageable alkali-soluble resin layer.

[0451] In this embodiment, the thickness of the first insulating coating layer 13 is in the range of 10 μm to 800 μm.

[0452] In this embodiment, the thickness of the first insulating coating layer 13 is in the range of 70 μm to 140 μm.

[0453] In this embodiment, the conductivity range of the first insulating coating 13 is 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

[0454] In this embodiment, the conductivity range of the first insulating coating 13 is 1.00*10 -17 S / cm~1.00*10 -14 S / cm.

[0455] The battery 1100 is described below with reference to some specific embodiments.

[0456] In this embodiment, referring to FIGS. 6 to 12 , a battery 1100 includes a battery cell 100 and a housing 200 , wherein the battery cell 100 is located in the housing 200 .

[0457] In this embodiment, the surface of the box body 200 facing the battery cells 100 is covered with a second insulating coating 24 .

[0458] In this embodiment, the second insulating coating 24 includes at least one of a second resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

[0459] In the present embodiment, the second insulating coating layer 24 includes a second resin coating layer including at least one of an epoxy resin layer, an acrylic resin layer, a polybutadiene resin layer, and a polyurethane resin layer.

[0460] In this embodiment, the surface of the second insulating coating layer 24 facing the battery cell 100 is covered with a third insulating coating layer 25 .

[0461] In this embodiment, the third insulating coating 25 includes at least one of a third resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

[0462] In this embodiment, the battery 1100 further includes an insulating adhesive layer 300 , which is bonded between the second insulating coating layer 24 and the battery cell 100 .

[0463] In this embodiment, the third insulating coating layer 25 includes a third resin coating layer, and the third resin coating layer includes at least one of an epoxy resin layer, a phenolic resin layer, an acrylic resin layer, a melamine formaldehyde resin layer, and a silicone resin layer.

[0464] In this embodiment, the battery 1100 further includes an insulating adhesive layer 300 , which is bonded between the third insulating coating layer 25 and the battery cell 100 .

[0465] In this embodiment, the battery 1100 further includes an insulating strip 400 , which is embedded in the insulating adhesive layer 300 .

[0466] In this embodiment, the insulating adhesive layer 300 includes an adhesive portion 31 , and the adhesive portion 31 is provided between the insulating strip 400 and the first insulating coating 13 ; and / or, the adhesive portion 31 is provided between the insulating strip 400 and the third insulating coating 25 .

[0467] In this embodiment, the box body 200 includes a first part 21 and a second part 22. The first part 21 and the second part 22 are connected and enclosed to form a receiving space 202. The battery cell 100 is located in the receiving space 202. The second part 22 is used to support the battery cell 100. The second part 22 includes a metal part, and the outer shell 11 includes a metal shell.

[0468] The manufacturing method of the battery cell 100 is described below with reference to some specific embodiments.

[0469] Example 1

[0470] In this embodiment, referring to FIG. 15 and FIG. 16 , the battery cell manufacturing method includes:

[0471] Installing the electrode assembly 12 into the housing 11;

[0472] An insulating coating material is applied to at least a portion of the outer surface 113 of the housing 11 to form a first insulating coating layer 13 .

[0473] In this embodiment, after the electrode assembly 12 is installed in the housing 11 and before the insulating coating is applied to at least a portion of the outer surface 113 of the housing 11, the battery cell manufacturing method further includes:

[0474] Clean at least the area of ​​the outer surface 113 of the housing 11 that needs to be coated with insulating paint;

[0475] And / or, after forming the first insulating coating 13, the battery cell manufacturing method further comprises:

[0476] The insulation and withstand voltage performance of the battery cell 100 is tested to determine whether the battery cell 100 is qualified.

[0477] In this embodiment, the battery cell manufacturing method further includes testing the insulation withstand voltage performance of the battery cell 100. After forming the first insulating coating 13 and before testing the insulation withstand voltage performance of the battery cell 100, the battery cell manufacturing method further includes:

[0478] The layer thickness of the first insulating coating 13 was measured.

[0479] Example 2

[0480] The difference between this embodiment and the first embodiment is that, as shown in FIG15 and FIG16 , installing the electrode assembly 12 into the housing 11 includes:

[0481] Install the electrode assembly 12 into the shell 112 from the opening of the shell 112 of the outer shell 11;

[0482] The end cover 111 of the outer shell 11 is covered on the opening of the housing 112 to seal the opening of the housing 112 .

[0483] In this embodiment, preparing the first insulating coating layer 13 includes preparing the first insulating coating layer 13 by using ultraviolet curing printing technology.

[0484] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0485] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include, shell; an electrode assembly disposed in the housing, the housing including an outer surface disposed away from the electrode assembly; A first insulating coating layer, at least a portion of the outer surface is covered with the first insulating coating layer.

2. The battery cell according to claim 1, wherein: The outer surface includes multiple side surfaces, the multiple side surfaces include a first side surface, at least an edge area of ​​the first side surface is covered with the first insulating coating, the other side surfaces except the first side surface are covered with the first insulating coating, and the first insulating coating covering the first side surface is connected to the first insulating coating covering the other side surfaces except the first side surface.

3. The battery cell according to claim 2, wherein: All areas of the outer surface except the first side surface are covered with a first insulating coating.

4. The battery cell according to claim 2 or 3, characterized in that: The battery cell further includes an electrode terminal for inputting or outputting electric energy, and the electrode terminal is disposed on the first side surface.

5. The battery cell according to any one of claims 2 to 4, characterized in that: When the battery cell is in use, the top surface of the housing forms the first side surface.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The outer surface includes multiple connected side surfaces, the multiple side surfaces include a first side surface and a second side surface relatively distributed along a first direction, a third side surface and a fourth side surface relatively distributed along a second direction, and a fifth side surface and a sixth side surface relatively distributed along a third direction, the first side surface, the second side surface, the third side surface, the fourth side surface, the fifth side surface and the sixth side surface are covered with a first insulating coating; wherein the first direction, the second direction and the third direction are perpendicular to each other.

7. The battery cell according to claim 6, characterized in that: The outer surface further includes a connecting surface, wherein at least two adjacent side surfaces are connected to each other by the connecting surface, and at least one of the connecting surfaces is covered with the first insulating coating.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The battery cell further includes an electrode terminal for inputting or outputting electric energy, wherein the electrode terminal is electrically connected to the electrode assembly and connected to the outer shell; the first insulating coating is provided with a through hole for the electrode terminal to pass through.

9. The battery cell according to claim 8, characterized in that: The through holes are arranged in a one-to-one correspondence with the electrode terminals.

10. The battery cell according to claim 8 or 9, characterized in that: The through hole is gap-matched with the electrode terminal.

11. The battery cell according to claim 10, characterized in that: The maximum distance between the hole wall of the through hole and the electrode terminal is L, wherein 0mm<L≤3mm.

12. The battery cell according to claim 11, characterized in that: 0.3mm≤L≤2mm.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The battery cell is covered with an insulating film.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The first insulating coating includes at least one of a first resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

15. The battery cell according to claim 14, characterized in that: The first insulating coating layer includes the first resin coating layer, and the first resin coating layer includes a photosensitive resin coating layer.

16. The battery cell according to claim 15, characterized in that: The photosensitive resin coating layer includes at least one of an epoxy acrylate layer, a polyurethane acrylic resin layer, a polyester acrylic resin layer, an amino acrylic resin layer, and a photoimageable alkali-soluble resin layer.

17. The battery cell according to any one of claims 1 to 16, characterized in that: The thickness of the first insulating coating layer ranges from 10 μm to 800 μm.

18. The battery cell according to claim 17, characterized in that: The thickness of the first insulating coating layer is in the range of 70 μm to 140 μm.

19. The battery cell according to any one of claims 1 to 18, characterized in that: The conductivity range of the first insulating coating is 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

20. The battery cell according to claim 19, characterized in that: The conductivity range of the first insulating coating is 1.00*10 -17 S / cm~1.00*10 -14 S / cm.

21. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 20.

22. The battery according to claim 21, characterized in that: The battery further includes a box, and the battery cells are located in the box.

23. The battery according to claim 22, characterized in that: The surface of the box body facing the battery cells is covered with a second insulating coating.

24. The battery according to claim 23, characterized in that: The second insulating coating includes at least one of a second resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

25. The battery according to claim 23 or 24, characterized in that: The second insulating coating layer includes a second resin coating layer including at least one of an epoxy resin layer, an acrylic resin layer, a polybutadiene resin layer, and a polyurethane resin layer.

26. The battery according to any one of claims 23 to 25, characterized in that: The battery further includes an insulating adhesive layer adhered between the second insulating coating layer and the battery cell.

27. The battery according to any one of claims 23 to 25, characterized in that: The surface of the second insulating coating layer facing the battery cell is covered with a third insulating coating layer.

28. The battery according to any one of claims 27, characterized in that: The battery further includes an insulating adhesive layer adhered between the third insulating coating layer and the battery cell.

29. The battery according to claim 28, characterized in that: The battery further includes an insulating strip embedded in the insulating adhesive layer.

30. The battery according to claim 29, wherein: The insulating adhesive layer includes an adhesive portion, and the adhesive portion is provided between the insulating strip and the battery cell; and / or, the adhesive portion is provided between the insulating strip and the third insulating coating layer.

31. The battery according to any one of claims 27 to 30, characterized in that: The third insulating coating includes at least one of a third resin coating, a mica coating, a ceramic coating, an organic silicon aluminum powder coating, and a glass coating.

32. The battery according to claim 31, characterized in that: The third insulating coating layer includes a third resin coating layer including at least one of an epoxy resin layer, a phenolic resin layer, an acrylic resin layer, a melamine formaldehyde resin layer, and a silicone resin layer.

33. The battery according to any one of claims 23 to 32, characterized in that: The box includes a heat exchange plate, which includes a flow channel for a heat exchange medium to flow so that the heat exchange medium can exchange heat with the battery cells. The surface of the heat exchange plate facing the battery cells is covered with the second insulating coating.

34. The battery according to any one of claims 22 to 33, characterized in that: The box body includes a first part and a second part, the first part and the second part are connected and enclosed to form a receiving space, the battery cell is located in the receiving space, the second part is used to support the battery cell, the second part includes a metal part, and the outer shell includes a metal shell.

35. An electrical device, characterized in that: A battery comprising the battery according to any one of claims 21 to 34.

36. An energy storage device, characterized in that: A battery comprising the battery according to any one of claims 21 to 34.

37. A method for manufacturing a battery cell, characterized in that: The battery cell manufacturing method is used to manufacture the battery cell according to any one of claims 1 to 20, and the battery cell manufacturing method comprises: placing the electrode assembly into the housing; An insulating coating is applied to at least a portion of the outer surface of the housing to obtain the first insulating coating.

38. The method for manufacturing a battery cell according to claim 37, wherein: Producing the first insulating coating comprises: The first insulating coating is produced by using ultraviolet curing printing technology.

39. The method for manufacturing a battery cell according to claim 37 or 38, wherein: Installing the electrode assembly into the housing comprises: Installing the electrode assembly into the shell through the opening of the shell of the housing; The end cover of the outer shell is covered on the opening of the shell body to seal the opening of the shell body.

40. The method for manufacturing a battery cell according to any one of claims 37 to 39, wherein: After the electrode assembly is installed in the housing and before the insulating coating is applied to at least a portion of the outer surface of the housing, the battery cell manufacturing method further includes: Cleaning at least the area of ​​the outer surface of the housing where the insulating coating is to be applied; And / or, after forming the first insulating coating layer, the battery cell manufacturing method further comprises: The insulation and voltage resistance performance of the battery cell is tested to determine whether the battery cell is qualified.

41. The method for manufacturing a battery cell according to claim 40, wherein: The battery cell manufacturing method further includes testing the insulation and withstand voltage performance of the battery cell. After forming the first insulating coating layer and before testing the insulation and withstand voltage performance of the battery cell, the battery cell manufacturing method further includes: The layer thickness of the first insulating coating layer was measured.

Images