Battery, electric device, and energy storage device

Abstract

A battery (1100), an electric device, and an energy storage device. The battery (1100) comprises a battery cell (100) and a case (200). The battery cell (100) is located in the case (200). The case (200) comprises a case wall (201). The surface of the case wall (201) facing the battery cell (100) is sequentially covered with a first insulating coating (24), a second insulating coating (25), and an insulating adhesive layer (300). The first insulating coating (24) is located between the case wall (201) and the second insulating coating (25). The battery cell (100) is adhered to the insulating adhesive layer (300). The battery cell (100) can be insulated from the case wall (201) of the case (200) by means of the first insulating coating (24), the second insulating coating (25) and the insulating adhesive layer (300). The insulating effect between the battery cell (100) and the case (200) is good. The battery cell (100), the case (200), the first insulating coating (24), the second insulating coating (25) and the insulating adhesive layer (300) are connected to form a whole, thereby facilitating the improvement of the structural strength, modal performance, insulation reliability and use reliability of the battery cell (100).

Description

Batteries, electrical devices and energy storage devices Technical Field

[0001] The present application belongs to the field of battery insulation technology, and in particular relates to 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 battery reliability are becoming higher and higher. Therefore, there is an urgent need to provide a battery with better reliability.

[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, an electrical device, and an energy storage device, aiming to improve the reliability of the battery.

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

[0008] In a first aspect, a battery is provided, which includes a battery cell and a box body, wherein the battery cell is located in the box body, and the box body includes a box wall, and the surface of the box wall facing the battery cell is covered with a first insulating coating, a second insulating coating and an insulating adhesive layer in sequence, wherein the first insulating coating is located between the box wall and the second insulating coating, and the battery cell is adhered to the insulating adhesive layer.

[0009] In the battery of the embodiment of the present application, the box wall of the box body is sequentially covered with a first insulating coating, a second insulating coating and an insulating adhesive layer, so that the battery cell and the box wall can be insulated by the multi-layer insulation structure of the first insulating coating, the second insulating coating and the insulating adhesive layer, and the insulation effect between the battery cell and the box body is good; in addition, the box wall adopts a coating insulation method of the first insulating coating and the second insulating coating, and the connection strength between the first insulating coating and the box wall and between the second insulating coating and the first insulating coating is good, the first insulating coating and the second insulating coating are not easy to fall off, and the insulation reliability between the battery cell and the box wall of the box body can be improved; in addition, the second insulating coating and the battery cell are bonded with an insulating adhesive layer. On the one hand, the battery cell and the box body can be connected as a whole, which is beneficial to improving the structural strength and modal performance of the battery cell; on the other hand, the battery cell is not easy to move relative to the second insulating coating, reducing the risk of insulation failure between the battery cell and the box wall, battery cell movement, etc., improving the insulation reliability of the battery and improving the reliability of the battery.

[0010] 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.

[0011] 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. The first insulating coating can be flexibly selected to meet different usage requirements.

[0012] In some embodiments, the first insulating coating layer includes a first 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.

[0013] By adopting the technical solution of this embodiment, the material of the first resin coating can be flexibly set to meet different usage requirements.

[0014] In some embodiments, the first insulating coating layer has a thickness ranging from 10 μm to 60 μm.

[0015] By adopting the technical solution of this embodiment, the thickness of the first insulating coating is reasonably set, so that the first insulating coating has good insulation performance and the insulation performance of the box is good; at the same time, the thickness of the first insulating coating is not too large, which is beneficial to reducing the production cost of the box.

[0016] In some embodiments, the first insulating coating layer has a thickness ranging from 20 μm to 40 μm.

[0017] 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.

[0018] In some embodiments, the conductivity of the first insulating coating is in the range of 1.00*10 -17 S / cm~1.00*10 -13 S / cm.

[0019] By adopting the technical solution of this embodiment, the electrical conductivity of the first insulating coating is relatively small, and the first insulating coating has good insulating properties, so that the box has good insulating properties; in addition, the electrical 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.

[0020] In some embodiments, the conductivity of the first insulating coating is in the range of 1.00*10 -16 S / cm~1.00*10 -14 S / cm.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] In some embodiments, the second insulating coating layer includes a second 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.

[0025] By adopting the technical solution of this embodiment, the material of the second resin coating can be flexibly set to meet different usage requirements.

[0026] In some embodiments, the second insulating coating layer has a thickness ranging from 60 μm to 700 μm.

[0027] By adopting the technical solution of this embodiment, the thickness of the second insulating coating is reasonably set, so that the second insulating coating has good insulation performance and the insulation performance of the box is good; at the same time, the thickness of the second insulating coating is not too large, which is beneficial to reducing the production cost of the box.

[0028] In some embodiments, the second insulating coating layer has a thickness ranging from 140 μm to 450 μm.

[0029] By adopting the technical solution of this embodiment, the thickness of the second insulating coating layer is set more reasonably, which can better take into account the insulation performance, production cost and heat exchange effect of the second insulating coating layer.

[0030] In some embodiments, the conductivity of the second insulating coating ranges from 1.00 to 10 -18 S / cm~1.00*10 -13 S / cm.

[0031] By adopting the technical solution of this embodiment, the electrical conductivity of the second insulating coating is relatively small, and the second insulating coating has good insulating properties, so that the box has good insulating properties; in addition, the electrical conductivity of the second insulating coating is not too small, so the second insulating coating can be made of relatively cheap materials, which is beneficial to reducing the production cost of the second insulating coating.

[0032] In some embodiments, the conductivity of the second insulating coating ranges from 1.00 to 10 -17 S / cm~1.00*10 -14 S / cm.

[0033] By adopting the technical solution of this embodiment, the design of the conductivity σ2 of the second insulating coating is more reasonable, which can better take into account the production cost and insulation performance of the second insulating coating.

[0034] In some embodiments, the thermal conductivity of the second insulating coating layer ranges from 0.1 W / (m·K) to 1.5 W / (m·K).

[0035] By adopting the technical solution of this embodiment, the thermal conductivity coefficient of the second insulating coating is reasonably set, which can better meet the heat exchange requirements between the battery cell and the box wall of the box; in addition, a relatively low-cost material can be selected to make the second insulating coating, which can take into account both the heat exchange requirements of the battery cell and the production cost of the box.

[0036] In some embodiments, the thermal conductivity of the second insulating coating layer ranges from 0.3 W / (m·K) to 1 W / (m·K).

[0037] By adopting the technical solution of this embodiment, the heat exchange requirements between the battery cells and the box wall and the production cost of the box can be better taken into account.

[0038] In some embodiments, the thickness of the insulating adhesive layer ranges from 500 μm to 3000 μm.

[0039] By adopting the technical solution of this embodiment, the thickness of the insulating adhesive layer is reasonably set, so that the insulating adhesive layer has good insulation performance, and the insulation performance between the battery cell and the box body is good; the insulating adhesive layer can also better bond the box wall and the battery cell together stably; in addition, the thickness of the insulating adhesive layer is not too large, which is beneficial to reducing the production cost of the box body.

[0040] In some embodiments, the thickness of the insulating adhesive layer ranges from 700 μm to 1500 μm.

[0041] By adopting the technical solution of this embodiment, the thickness of the insulating adhesive layer is set more reasonably, which can better take into account the insulation and bonding fixation between the battery cell and the box body as well as the production cost of the battery.

[0042] In some embodiments, the conductivity of the insulating adhesive layer is in the range of 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

[0043] By adopting the technical solution of this embodiment, the electrical conductivity of the insulating adhesive layer is relatively small, and the insulating adhesive layer has good insulation performance, so that the battery cell and the box body have good insulation performance; in addition, the electrical conductivity of the insulating adhesive layer is not too small, so that the insulating adhesive layer can be made of relatively cheap materials, which is beneficial to reducing the production cost of the insulating adhesive layer.

[0044] In some embodiments, the conductivity of the insulating adhesive layer is in the range of 5.00*10 -16 S / cm~1.00*10 -14 S / cm.

[0045] By adopting the technical solution of this embodiment, the design of the electrical conductivity of the insulating adhesive layer is more reasonable, which can better balance the production cost and insulation performance of the insulating adhesive layer.

[0046] In some embodiments, the battery further includes an insulating strip embedded in the insulating adhesive layer.

[0047] By adopting the technical solution of this embodiment, the battery cell and the box wall can be insulated and separated by the insulating strip, which is beneficial to improving the insulation pressure resistance between the battery cell and the box 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, reduces the amount of glue applied, and reduces the production cost.

[0048] 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 second insulating coating layer.

[0049] By adopting this technical solution, the bonding part can further increase the insulation voltage resistance performance between the battery cell and the box, which is beneficial for the battery to meet the use of higher voltage devices; 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.

[0050] In some embodiments, in a direction from the second insulating coating layer toward the battery cell, a size of the insulating strip ranges from 0.5 mm to 1.8 mm.

[0051] By adopting the technical solution of this embodiment, the size of the insulating strip is set reasonably, so that the battery cell and the box have a certain insulation distance, and the insulation performance between the battery cell and the box is good; in addition, the size of the insulating strip is not too large, which is conducive to reducing the production cost of the box.

[0052] In some embodiments, in a direction from the second insulating coating layer toward the battery cell, a size of the insulating strip ranges from 0.6 mm to 1.4 mm.

[0053] By adopting the technical solution of this embodiment, the size of the insulating strip is reasonably set, which can better take into account the insulation between the battery cell and the box body and the production cost of the battery.

[0054] In some embodiments, the conductivity of the insulating strip is in the range of 1.00*10 -15 S / cm~1.00*10 -11 S / cm.

[0055] By adopting the technical solution of this embodiment, the electrical conductivity of the insulating strip is relatively low, and the insulating strip has good insulation performance, so that good insulation performance is achieved between the battery cell and the box body; in addition, the electrical conductivity of the insulating strip is not too low, so that the insulating strip can be made of relatively cheap materials, which is beneficial to reducing the production cost of the insulating strip.

[0056] In some embodiments, the conductivity of the insulating strip is in the range of 1.00*10 -14 S / cm~1.00*10 -12 S / cm.

[0057] By adopting the technical solution of this embodiment, the design of the electrical conductivity of the insulating strip is more reasonable, and the production cost and insulation performance of the insulating strip can be better taken into account.

[0058] In some embodiments, the box body 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 cell; the heat exchange plate forms at least part of the box wall, and the surface of the heat exchange plate facing the battery cell is covered with a first insulating coating.

[0059] 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 first insulating coating is provided on the heat exchange plate, which can also insulate the heat exchange plate from the battery cell, thereby improving the reliability of the battery.

[0060] In some embodiments, the battery cell includes a housing and an electrode assembly disposed in the housing. The housing includes an outer surface disposed away from the electrode assembly. At least a region of the outer surface facing the first insulating coating is covered with a third insulating coating.

[0061] By adopting the technical solution of this embodiment, the coating area of ​​the third insulating coating layer can be flexibly set to meet different insulation requirements.

[0062] In some embodiments, a battery cell includes a shell and an electrode assembly disposed within the shell, the shell includes an outer surface disposed back to the electrode assembly, 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 a third insulating coating, and the other side surfaces except the first side surface are covered with a third insulating coating, and the third insulating coating covering the first side surface and the third insulating coating covering the other side surfaces except the first side surface are connected.

[0063] By adopting the technical solution of this embodiment, the first side and the other side are covered with the third insulating coating, and the third insulating coatings are connected, so that most areas of the shell are covered with the third insulating coating, the insulation area of ​​the battery cell is large, and the insulation effect of the battery cell is good.

[0064] In some embodiments, all areas of the outer surface except the first side are covered with a third insulating coating.

[0065] 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.

[0066] In some embodiments, the battery cell includes an electrode terminal for inputting or outputting electrical energy, and the electrode terminal is disposed on the first side surface.

[0067] In some embodiments, when the battery cell is in use, the top surface of the housing forms the first side surface.

[0068] By adopting the technical solution of this embodiment, the third insulating coating can be applied to the side where the electrode terminal is provided. The coverage area of ​​the third insulating coating is large, and the insulating area of ​​the battery cell is large, which is beneficial to improving the insulation performance of the battery cell.

[0069] By adopting the technical solution of this embodiment, the top surface of the shell is also covered with a third insulating coating. The third 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.

[0070] 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 third insulating coating; wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0071] 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 third 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.

[0072] In some embodiments, the outer surface further includes a connecting surface, at least part of two adjacent side surfaces are connected by a connecting surface, and at least one connecting surface is covered with a third insulating coating.

[0073] 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.

[0074] In some embodiments, the battery cell 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 shell; the third insulating coating is provided with a through hole for allowing the electrode terminal to pass through.

[0075] 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 third insulating coating. The third insulating coating has a large coverage area, which is beneficial to improving the insulation performance of the battery cell.

[0076] In some embodiments, the through holes are arranged in a one-to-one correspondence with the electrode terminals.

[0077] By adopting the technical solution of this embodiment, the third insulating coating can be filled between the electrode terminals, thereby improving the insulation effect between the electrode terminals and increasing the area of ​​the battery cell covered by the third insulating coating, which is beneficial to improving the insulation and withstand voltage effect of the battery cell.

[0078] In some embodiments, the through holes are provided to be gap-matched with the electrode terminals.

[0079] By adopting the technical solution of this embodiment, a gap is formed between the electrode terminal and the third insulating coating, reducing the risk of the third 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.

[0080] 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.

[0081] By adopting the technical solution of this embodiment, the design of 0mm<L≤3mm reduces the risk of the third insulating coating covering the electrode terminal. At the same time, the distance between the through hole and the electrode terminal is not too large, so that most of the side area of ​​the shell where the electrode terminal is provided can be covered by the third insulating coating, which is beneficial to improving the insulation performance of this side.

[0082] In some embodiments, 0.3 mm ≤ L ≤ 2 mm.

[0083] By adopting the technical solution of this embodiment, the design of 0.3mm≤L≤2mm makes the spacing between the through hole and the electrode terminal more reasonable, and can take into account both the insulation performance of the battery cell and the electrical connection of the electrode terminal.

[0084] In some embodiments, the battery cells are covered with an insulating film.

[0085] By adopting the technical solution of this embodiment, the insulating film can improve the insulation performance between the battery cell and the box body, so that the insulation and voltage resistance performance of the battery is better.

[0086] 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.

[0087] 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 cell. Moreover, the structure of the third insulating coating can be flexibly selected to meet different usage requirements.

[0088] In some embodiments, the third insulating coating layer includes a third resin coating layer, and the third resin coating layer includes a photosensitive resin coating layer.

[0089] By adopting the technical solution of this embodiment, the third 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.

[0090] In some embodiments, the photosensitive resin coating layer includes at least one of an epoxy acrylate resin layer, a polyurethane acrylate resin layer, a polyester acrylate resin layer, an amino acrylate resin layer, and a photoimageable alkali-soluble resin layer.

[0091] By adopting the technical solution of this embodiment, the third 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.

[0092] In some embodiments, the third insulating coating layer has a thickness ranging from 10 μm to 800 μm.

[0093] By adopting the technical solution of this embodiment, the layer thickness of the third insulating coating is reasonably set, so that the third insulating coating has good insulation performance and the battery cell has good insulation voltage resistance performance; at the same time, the layer thickness of the third 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.

[0094] In some embodiments, the third insulating coating layer has a thickness ranging from 70 μm to 140 μm.

[0095] By adopting the technical solution of this embodiment, the thickness of the third insulating coating layer is set more reasonably, which can better take into account the insulation performance, production cost and heat exchange effect of the third insulating coating layer.

[0096] In some embodiments, the electrical conductivity of the third insulating coating is in the range of 1.00*10- 18 S / cm~1.00*10 -13 S / cm.

[0097] By adopting the technical solution of this embodiment, the electrical conductivity of the third insulating coating is relatively small, and the third insulating coating has good insulating properties, so that the battery cell has good insulating properties; in addition, the electrical conductivity of the third insulating coating is not too small, so that the third insulating coating can be made of relatively cheap materials, which is beneficial to reducing the production cost of the third insulating coating.

[0098] In some embodiments, the electrical conductivity of the third insulating coating is in the range of 1.00*10 -17 S / cm~1.00*10 -14 S / cm.

[0099] By adopting the technical solution of this embodiment, the design of the conductivity σ5 of the third insulating coating is more reasonable, which can better take into account the production cost and insulation performance of the third insulating coating.

[0100] In a second aspect, an electrical device is provided, comprising the battery as described in the above embodiment.

[0101] The electrical device of the embodiment of the present application adopts the above-mentioned battery, which has good insulation voltage resistance and insulation reliability, which is beneficial to improving the reliability of the electrical device and also beneficial to meeting the use requirements of high-voltage electrical devices.

[0102] In a third aspect, an energy storage device is provided, comprising the battery as described in the above embodiment.

[0103] The energy storage device of the embodiment of the present application uses the above-mentioned battery, which has good insulation voltage resistance and insulation reliability, which helps to improve the reliability and service life of the energy storage device and also helps to meet the use requirements of high-voltage energy storage devices. For example, it can meet the needs of energy storage devices with voltages above 1500V.

[0104] 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

[0105] 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.

[0106] FIG1 is a schematic diagram of an exploded view of a battery provided in some embodiments of the present application.

[0107] FIG2 is a schematic structural diagram of the battery shown in FIG1 .

[0108] FIG3 is a cross-sectional view taken along line AA in FIG2 .

[0109] FIG4 is a partial enlarged view of point B in FIG3 .

[0110] FIG5 is a partial enlarged view of a battery provided in some other embodiments of the present application at point B in FIG3 .

[0111] FIG6 is a partial enlarged view of a battery provided in some other embodiments of the present application at point B in FIG3 .

[0112] FIG. 7 is an exploded schematic diagram of another embodiment of the battery shown in FIG. 1 .

[0113] FIG8 is a schematic structural diagram of a battery cell provided by some embodiments of the present application after the third insulating coating is hidden.

[0114] FIG9 is a schematic structural diagram of a battery cell provided in some other embodiments of the present application.

[0115] FIG10 is a cross-sectional view taken along line CC in FIG9 .

[0116] FIG11 is a cross-sectional view taken along line DD in FIG9 .

[0117] FIG12 is a schematic diagram of an exploded view of a battery cell provided in some other embodiments of the present application.

[0118] FIG13 is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0119] FIG14 is a schematic structural diagram of an energy storage container provided in some embodiments of the present application.

[0120] FIG15 is a flow chart of a battery cell manufacturing method provided in some embodiments of the present application.

[0121] FIG16 is a flow chart of a battery cell manufacturing method provided in some other embodiments of the present application.

[0122] In the figures, the following reference numerals are used: 1000, vehicle; 1100, battery; 1200, controller; 1300, motor; 100, battery cell; 11, housing; 111, end cap; 112, housing; 113, outer surface; 1131, side surface; 11311, first side surface; 11312, second side surface; 11313, third side surface; 11314, fourth side surface; 11315, fifth side surface; 11316, sixth side surface; 1132, connecting surface; 12, electrode assembly; 13, third insulating coating layer; 131, through-hole; 14, electrode terminal; 15, insulating film; 2 00. Box body; 201. Box wall; 202. Accommodation space; 21. First part; 211. Top wall; 22. Second part; 221. Bottom wall; 222. Side wall; 23. Heat exchange plate; 24. First insulating coating; 25. Second insulating coating; 300. Insulating adhesive layer; 31. Adhesive part; 400. Insulating strip; 2000. Energy storage container; 2100. Container; 2200. Battery compartment; 1100. Battery. DETAILED DESCRIPTION

[0123] 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.

[0124] 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.

[0125] 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.

[0126] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] The battery includes a housing and battery cells, wherein the battery cells are arranged in the housing. As the application range of batteries continues to expand, the insulation reliability requirements between the battery cells and the housing are becoming increasingly higher. Therefore, there is an urgent need to provide a battery with better insulation reliability.

[0134] In the related art, a battery is provided, which includes a battery cell and a box body. The battery cell is arranged in the box body, and an insulating member is provided between the battery cell and the box wall of the box body. The insulating member insulates and separates the battery cell from the box wall of the box body to achieve insulation between the battery cell and the box body; however, during actual use, the insulating member is easy to move, causing insulation failure between the battery cell and the box wall, movement of the battery cell and other problems, resulting in poor insulation reliability of the battery and poor battery reliability.

[0135] Based on this, in order to improve the insulation reliability between the battery cell and the box wall of the box body, the box wall of the battery is sequentially covered with a first insulating coating, a second insulating coating and an insulating adhesive layer, so that the battery cell and the box wall of the box body can be insulated by the multi-layer insulation structure of the first insulating coating, the second insulating coating and the insulating adhesive layer, and the insulation effect is good; in addition, the box wall adopts the coating insulation method of the first insulating coating and the second insulating coating, and the connection strength between the first insulating coating and the box wall and between the second insulating coating and the first insulating coating is good, the first insulating coating and the second insulating coating are not easy to fall off, and the insulation reliability between the battery cell and the box wall of the box body can be improved; in addition, the second insulating coating and the battery cell are bonded with an insulating adhesive layer. On the one hand, the battery cell and the box body can be connected as a whole, which is beneficial to improving the structural strength and modal performance of the battery cell; on the other hand, the battery cell is not easy to move relative to the second insulating coating, reducing the risk of insulation failure between the battery cell and the box wall, battery cell movement, etc., improving the insulation reliability of the battery, and improving the reliability of the battery.

[0136] The following describes the battery, power-consuming device, and energy storage device of the embodiments of the present application.

[0137] 1 , in some embodiments, a 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.

[0138] 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.

[0139] In another embodiment of the present application, the battery 1100 further includes a box body 200 , and the battery cell 100 is located in the box body 200 .

[0140] The housing 200 may be a hollow shell structure, and the battery cells 100 are housed within the housing 200. The housing 200 provides a housing space 202 for the battery cells 100 and can have various structures. The housing 200 protects the battery cells 100 and improves the reliability of the battery 1100.

[0141] For example, the housing 200 may include a first portion 21 and a second portion 22. The first portion 21 and the second portion 22 overlap 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. The first portion 21 overlaps 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 overlapping the open side of the second portion 22. Of course, the housing 200 formed by the first portion 21 and the second portion 22 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc. The second portion 22 supports the battery cells 100. For example, the second portion 22 may refer to the portion located at the bottom of the housing 200. However, in other embodiments, the second portion 22 may also refer to the portion located at the top.

[0142] The second part 22 is made of metal material, such as aluminum alloy, aluminum, steel, etc.; the outer shell 11 is made of metal material, such as aluminum alloy, aluminum, steel, etc. The first part 21 can be made of metal material or non-metallic material. The metal outer shell 11 and the metal second part 22 can be insulated and separated by a multi-layer insulation structure of a first insulating coating 24, a second insulating coating 25, an insulating adhesive layer 300, an insulating strip 400 and a third insulating coating 13, and the insulation performance between the battery cell 100 and the box body 200 is good. The second part 22 and the outer shell 11 of the box body 200 are both made of metal material, so that the box body 200 and the battery cell 100 have good structural strength, which is beneficial to improving the reliability of the battery 1100.

[0143] In some embodiments, the housing 11 and the second portion 22 may also be made of non-metal, such as rubber, plastic, etc.

[0144] 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.

[0145] 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.

[0146] For ease of understanding and description, the embodiments provided in this application are described using only a rectangular parallelepiped battery cell 100 . It should be understood that the embodiments provided in this application are also applicable to a cylindrical battery cell 100 or a soft-pack battery cell 100 .

[0147] In one embodiment of the present application, referring to Figures 1 to 7, a battery 1100 is provided, which includes a battery cell 100 and a box body 200. The battery cell 100 is located in the box body 200. The box body 200 includes a box wall 201. The surface of the box wall 201 facing the battery cell 100 is covered with a first insulating coating 24, a second insulating coating 25 and an insulating adhesive layer 300 in sequence. The first insulating coating 24 is located between the box wall 201 and the second insulating coating 25. The battery cell 100 is adhered to the insulating adhesive layer 300.

[0148] The box wall 201 of the box body 200 may refer to a wall portion located on one side of the box body 200, such as: the bottom wall, top wall, side wall 222 of the box body 200, etc.; the box body 200 may include multiple box bodies 200, and multiple box walls 201 are connected and arranged to form the internal space of the box body 200; wherein, it may refer to a box wall 201 covered with a first insulating coating 24, a second insulating coating 25 and an insulating adhesive layer 300, or it may refer to multiple box walls 201 covered with a first insulating coating 24, a second insulating coating 25 and an insulating adhesive layer 300, which can be set specifically according to actual needs.

[0149] A battery cell 100 is the smallest unit used to store or release electrical energy. For example, a battery cell 100 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. A battery cell 100 can be cylindrical, flat, rectangular, or have other shapes.

[0150] The first insulating coating 24 may refer to a coating structure with insulating properties; the insulating coating is applied to the surface of the box wall 201 of the box body 200 facing the battery cell 100 to obtain the first insulating coating 24. For example, the insulating coating may be, but is not limited to, spraying, electrophoresis, or printing to obtain the first insulating coating 24. The insulating coating may be, but is not limited to, resin or plastic. The first insulating coating 24 is located between the battery cell 100 and the box wall 201 of the box body 200, which 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 first insulating coating 24 covering the box wall 201 of the box body 200 can also play an anti-corrosion role, which is beneficial to increasing the service life of the box body 200.

[0151] The surface of the box wall 201 of the box body 200 facing the battery cell 100 may refer to the inner wall surface of the box wall 201 , and the second insulating coating 25 may cover a partial area of ​​the inner wall surface of the box wall 201 or the entire inner wall surface of the box wall 201 .

[0152] The second insulating coating 25 may be a coating structure with insulating properties. The insulating coating is applied to the surface of the first insulating coating 24 facing the battery cell 100 to form the second insulating coating 25. The first insulating coating 24 is located between the second insulating coating 25 and the wall 201 of the housing 200. For example, the insulating coating 25 may be applied, but is not limited to, by spraying, electrophoresis, or printing. The insulating coating may be made of, but is not limited to, resin or plastic. The first and second insulating coatings 24 and 25 are located between the battery cell 100 and the wall 201 of the housing 200, creating a double layer of insulation between the battery cell 100 and the housing 200. This improves the insulation and withstand voltage performance between the battery cell 100 and the housing 200, which is beneficial for the insulation and withstand voltage performance of the battery 1100. Furthermore, the strong connection between the first and second insulating coatings 24 and 25 enhances the insulation reliability between the wall 201 of the housing 200 and the battery cell 100, which improves the reliability of the battery 1100.

[0153] 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.

[0154] In the battery 1100 of the embodiment of the present application, the box wall 201 of the box body 200 is sequentially covered with a first insulating coating 24, a second insulating coating 25 and an insulating adhesive layer 300, so that the battery cell 100 and the box wall 201 of the box body 200 can be insulated by the multi-layer insulation structure of the first insulating coating 24, the second insulating coating 25 and the insulating adhesive layer 300, and the insulation effect between the battery cell 100 and the box body 200 is good; in addition, the first insulating coating 24 and the second insulating coating 25 are used on the box wall 201 for coating insulation, and the connection strength between the first insulating coating 24 and the box wall 201 and between the second insulating coating 25 and the first insulating coating 24 is good, and the first insulating coating 24 and the second insulating coating 25 are not easy to fall off, and can also improve the insulation reliability between the battery cell 100 and the box wall 201 of the box body 200; in addition, the second insulating coating 25 and the battery cell 100 are bonded with an insulating adhesive layer 300. On the one hand, the battery cell 100 and the box body 200 can be connected as a whole, which is beneficial to improving the structural strength and modal performance of the battery cell 100; on the other hand, the battery cell 100 is not easy to move relative to the second insulating coating 25, reducing the risk of insulation failure between the battery cell 100 and the box wall 201, the risk of movement of the battery cell 100, etc., improving the insulation reliability of the battery 1100, and improving the reliability of the battery 1100.

[0155] In another embodiment of the present application, the first insulating coating 24 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.

[0156] The first 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.

[0157] The mica coating may refer to a coating made by coating a mica material on the outer surface 113 of the housing 11 .

[0158] The ceramic coating may refer to a coating formed by coating a ceramic material on the outer surface 113 of the housing 11 .

[0159] 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.

[0160] 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 .

[0161] In a possible implementation, the first insulating coating 24 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.

[0162] 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 box body 200 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 between the battery cell 100 and the box wall 201 of the box body 200.

[0163] 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 box body 200 still has good insulation performance, which is beneficial to improving the insulation reliability of the battery 1100.

[0164] In another possible embodiment, the first insulating coating 24 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 24 has a multi-layer structure; in the first 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.

[0165] By adopting the technical solution of this embodiment, the first insulating coating 24 has a good insulation effect. In addition, the first 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 first insulating coating 24 can be flexibly selected to meet different usage requirements.

[0166] In another embodiment of the present application, the first insulating coating layer 24 includes a first resin coating layer, and the first 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.

[0167] The epoxy resin layer may refer to a coating structure made using epoxy resin.

[0168] The acrylic resin layer may refer to a coating structure made using acrylic resin.

[0169] The polybutadiene resin layer may refer to a coating structure made using polybutadiene resin.

[0170] The polyurethane resin layer may refer to a coating structure made using polyurethane resin.

[0171] In a possible embodiment, the first 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 first resin coating can be a single-layer structure, and the first resin coating is simple and convenient to manufacture.

[0172] In another possible embodiment, the first 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 first resin coating has a multi-layer structure to meet different insulation requirements; in the first 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.

[0173] By adopting the technical solution of this embodiment, the material of the first resin coating can be flexibly set to meet different usage requirements.

[0174] In another embodiment of the present application, referring to FIG. 2 to FIG. 4 , the thickness of the first insulating coating 24 is in the range of 10 μm to 60 μm.

[0175] It is understood that the thickness of the first insulating coating 24 may refer to the distance between two opposing surfaces of the first insulating coating 24 in the thickness direction. The thickness of the first insulating coating 24 is h1, where 10 μm ≤ h1 ≤ 60 μm. There are various ways to measure the coating thickness, for example, using a handheld film tester.

[0176] By adopting the technical solution of this embodiment, the layer thickness h1 of the first insulating coating 24 is reasonably set, so that the first insulating coating 24 has good insulation performance and the insulation performance of the box 200 is good; at the same time, the layer thickness h1 of the first insulating coating 24 is not too large, which is beneficial to reducing the production cost of the box 200.

[0177] In another embodiment of the present application, referring to FIG. 2 to FIG. 4 , the thickness of the first insulating coating layer 24 is in the range of 20 μm to 40 μm.

[0178] It can be understood that 20 μm ≤ h1 ≤ 40 μm.

[0179] By adopting the technical solution of this embodiment, the layer thickness h1 of the first insulating coating 24 is set more reasonably, which can better take into account the insulation performance, production cost and heat exchange effect of the first insulating coating 24.

[0180] In some embodiments, the value of h1 may be 10 μm, 60 μm, or any number between 10 μm and 60 μm; for example, the value of h1 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.

[0181] In another embodiment of the present application, the conductivity of the first insulating coating 24 is in the range of 1.00*10 -17 S / cm~1.00*10 -13 S / cm.

[0182] It is understood that the conductivity of the first insulating coating 24 is σ1, where 1.00*10 -17 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.

[0183] 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.

[0184] By adopting the technical solution of this embodiment, the electrical conductivity σ1 of the first insulating coating 24 is small, and the first insulating coating 24 has good insulation performance, so that the box 200 has good insulation performance; in addition, the electrical conductivity σ1 of the first insulating coating 24 is not too small, so that the first insulating coating 24 can be made of relatively cheap materials, which is beneficial to reducing the production cost of the first insulating coating 24.

[0185] In another embodiment of the present application, the conductivity of the first insulating coating 24 is in the range of 1.00*10 -16 S / cm~1.00*10 -14 S / cm.

[0186] It is understandable that 1.00*10 -16 S / cm≤σ1≤1.00*10 -14 S / cm.

[0187] By adopting the technical solution of this embodiment, the design of the conductivity σ1 of the first insulating coating 24 is more reasonable, which can better balance the production cost and insulation performance of the first insulating coating 24.

[0188] In some embodiments, the value of σ1 may be 1.00*10 -17 S / cm、1.00*10 -13 S / cm or 1.00*10 -13 S / cm~1.00*10 -13S / cm; for example, the value of σ1 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.

[0189] In another embodiment of the present application, the second insulating coating 25 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.

[0190] The second resin coating layer may refer to a coating layer formed by coating a resin material on the surface of the first 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.

[0191] In a possible implementation, the second insulating coating 25 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.

[0192] 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.

[0193] 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.

[0194] In another possible embodiment, the second insulating coating 25 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 25 has a multi-layer structure; in the second 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 based on actual needs.

[0195] By adopting the technical solution of this embodiment, the second insulating coating 25 has a good insulation effect. In addition, the second 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 second insulating coating 25 can be flexibly selected to meet different usage requirements.

[0196] In another embodiment of the present application, the second insulating coating layer 25 includes a second resin coating layer, and the second 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.

[0197] The phenolic resin layer may refer to a coating structure made using phenolic resin.

[0198] The acrylic resin layer may refer to a coating structure made using acrylic resin.

[0199] The melamine formaldehyde resin layer may refer to a coating structure made using melamine formaldehyde resin.

[0200] The organic silicone resin layer may refer to a coating structure made using organic silicone resin.

[0201] In a possible embodiment, the second 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 second resin coating can be a single-layer structure and the second resin coating is simple and convenient to manufacture.

[0202] In another possible embodiment, the second 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 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.

[0203] By adopting the technical solution of this embodiment, the material of the second resin coating can be flexibly set to meet different usage requirements.

[0204] In another embodiment of the present application, referring to FIG. 2 to FIG. 4 , the thickness of the second insulating coating layer 25 is in the range of 60 μm to 700 μm.

[0205] It can be understood that the thickness of the second insulating coating 25 may refer to the distance between two opposite surfaces of the second insulating coating 25 in the thickness direction; the thickness of the second insulating coating 25 is h2, wherein 60 μm≤h2≤700 μm.

[0206] By adopting the technical solution of this embodiment, the layer thickness h2 of the second insulating coating 25 is reasonably set, so that the second insulating coating 25 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 25 is not too large, which is beneficial to reducing the production cost of the box 200.

[0207] In another embodiment of the present application, referring to FIG. 2 to FIG. 4 , the thickness of the second insulating coating 25 is in the range of 140 μm to 450 μm.

[0208] It can be understood that 140 μm ≤ h2 ≤ 450 μm.

[0209] By adopting the technical solution of this embodiment, the layer thickness h2 of the second insulating coating 25 is set more reasonably, which can better take into account the insulation performance, production cost and heat exchange effect of the second insulating coating 25.

[0210] In some embodiments, the value of h2 may be 60 μm, 700 μm, or any number between 60 μm and 700 μm; for example, the value of h2 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.

[0211] In another embodiment of the present application, the conductivity of the second insulating coating 25 is in the range of 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

[0212] It can be understood that the conductivity of the second insulating coating 25 is σ2, where 1.00*10 -18 S / cm≤σ2≤1.00*10 -13 S / cm.

[0213] By adopting the technical solution of this embodiment, the electrical conductivity σ2 of the second insulating coating 25 is small, and the second insulating coating 25 has good insulation performance, so that the box 200 has good insulation performance; in addition, the electrical conductivity σ2 of the second insulating coating 25 is not too small, so that the second insulating coating 25 can be made of relatively cheap materials, which is beneficial to reducing the production cost of the second insulating coating 25.

[0214] In another embodiment of the present application, the conductivity of the second insulating coating 25 is in the range of 1.00*10 -17 S / cm~1.00*10 -14 S / cm.

[0215] It is understandable that 1.00*10 -17S / cm≤σ2≤1.00*10 -14 S / cm.

[0216] By adopting the technical solution of this embodiment, the design of the conductivity σ2 of the second insulating coating 25 is more reasonable, which can better balance the production cost and insulation performance of the second insulating coating 25.

[0217] In some embodiments, the value of σ2 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 σ2 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.

[0218] In another embodiment of the present application, the thermal conductivity of the second insulating coating 25 is in the range of 0.1 W / (m·K) to 1.5 W / (m·K).

[0219] 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.

[0220] The thermal conductivity of the second 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 in the range of 0.15 W / (m·K) to 0.25 W / (m·K), and an epoxy resin layer may have a thermal conductivity in the range of 0.2 W / (m·K) to 1.5 W / (m·K).

[0221] By adopting the technical solution of this embodiment, the thermal conductivity coefficient k of the second insulating coating 25 is reasonably set, which can better meet the heat exchange requirements between the battery cell 100 and the box wall 201 of the box body 200; in addition, a relatively low-cost material can be selected to make the second 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.

[0222] In another embodiment of the present application, the thermal conductivity of the second insulating coating 25 is in the range of 0.3 W / (m·K) to 1 W / (m·K).

[0223] It can be understood that 0.3 W / (m·K)≤k≤1 W / (m·K).

[0224] By adopting the technical solution of this embodiment, the heat exchange requirements between the battery cells 100 and the box wall 201 of the box body 200 and the manufacturing cost of the box body 200 can be better taken into account.

[0225] 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).

[0226] In another embodiment of the present application, referring to FIG. 2 to FIG. 4 , the thickness of the insulating adhesive layer 300 is in the range of 500 μm to 3000 μm.

[0227] 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 h3, wherein 500 μm≤h3≤3000 μm.

[0228] When the two opposite surfaces of the insulating adhesive layer 300 in the thickness direction are planes, h3 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, h3 is equal to the distance between the two surfaces in the plane area.

[0229] By adopting the technical solution of this embodiment, the layer thickness h3 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 wall 201 of the box body 200 and the battery cell 100 together; in addition, the layer thickness h3 of the insulating adhesive layer 300 is not too large, which is beneficial to reducing the production cost of the box body 200.

[0230] In another embodiment of the present application, referring to FIG. 2 to FIG. 4 , the thickness of the insulating adhesive layer 300 is in a range of 700 μm to 1500 μm.

[0231] It can be understood that 700 μm ≤ h3 ≤ 1500 μm.

[0232] By adopting the technical solution of this embodiment, the thickness h3 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.

[0233] In some embodiments, the value of h3 may be 500 μm, 3000 μm, or any number between 500 μm and 3000 μm; for example, the value of h3 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.

[0234] In another embodiment of the present application, the conductivity range of the insulating adhesive layer 300 is 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

[0235] It is understood that the electrical conductivity of the insulating adhesive layer 300 is σ3, where 1.00*10 -18 S / cm≤σ3≤1.00*10 -13 S / cm.

[0236] By adopting the technical solution of this embodiment, the electrical conductivity σ3 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 σ3 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.

[0237] In another embodiment of the present application, the conductivity range of the insulating adhesive layer 300 is 5.00*10 -16 S / cm~1.00*10 -14 S / cm.

[0238] It is understandable that 5.00*10 -16 S / cm≤σ3≤1.00*10 -14 S / cm.

[0239] By adopting the technical solution of this embodiment, the design of the conductivity σ3 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.

[0240] 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.

[0241] In another embodiment of the present application, referring to FIG. 4 and FIG. 7 , the battery 1100 further includes an insulating strip 400 , and the insulating strip 400 is embedded in the insulating adhesive layer 300 .

[0242] 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 arranged in a spaced-apart pattern along a direction or formed into a mesh structure to better support the battery cells 100.

[0243] 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.

[0244] By adopting the technical solution of this embodiment, the battery cell 100 can be insulated and separated from the box wall 201 of the box body 200 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.

[0245] In another embodiment of the present application, referring to Figures 4 to 6, the insulating adhesive layer 300 includes an adhesive portion 31, and the adhesive portion 31 is provided between the insulating strip 400 and the battery cell 100; and / or, the adhesive portion 31 is provided between the insulating strip 400 and the second insulating coating 25.

[0246] 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 box wall 201 of the box body 200 .

[0247] In one possible embodiment, referring to FIG5 , 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 outer shell 11 of the battery cell 100 can be insulated and separated by the adhesive portion 31 , the insulating strip 400 , the second insulating coating 25 and the first 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.

[0248] In another possible embodiment, referring to FIG4 , an adhesive portion 31 is provided between the insulating strip 400 and the second 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 second insulating coating 25 and the first 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.

[0249] In another possible embodiment, 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 second 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 second insulating coating 25 and the first 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.

[0250] 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.

[0251] In another embodiment of the present application, referring to FIG. 4 , in the direction from the second insulating coating 25 toward the battery cell 100 , the size of the insulating strip 400 ranges from 0.5 mm to 1.8 mm.

[0252] In the direction from the second insulating coating 25 to the battery cell 100 , the size of the insulating strip 400 may refer to the thickness of the insulating strip 400 . For example, the direction from the second insulating coating 25 to the battery cell 100 may refer to the Z direction in FIG. 4 .

[0253] In the direction from the second insulating coating layer 25 toward the battery cell 100 , the dimension of the insulating strip 400 is h4 , wherein 0.5 mm≦h4≦1.8 mm.

[0254] By adopting the technical solution of this embodiment, the size h4 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 h4 of the insulating strip 400 is not too large, which is conducive to reducing the production cost of the box body 200.

[0255] In another embodiment of the present application, referring to FIG. 4 , in the direction from the second insulating coating 25 toward the battery cell 100 , the size of the insulating strip 400 ranges from 0.6 mm to 1.4 mm.

[0256] It can be understood that 0.6mm≤h4≤1.4mm.

[0257] By adopting the technical solution of this embodiment, the size h4 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.

[0258] In some embodiments, the value of h4 can be 0.5mm, 1.8mm, or any number between 0.5mm and 1.8mm; for example, the value of h4 can be but is not limited to 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, and 1.8mm.

[0259] In another embodiment of the present application, the conductivity range of the insulating strip 400 is 1.00*10 -15 S / cm~1.00*10 -11 S / cm.

[0260] It is understood that the conductivity of the insulating strip 400 is σ4, where 1.00*10 -15 S / cm≤σ4≤1.00*10 -11 S / cm.

[0261] By adopting the technical solution of this embodiment, the electrical conductivity σ4 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 σ4 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.

[0262] In another embodiment of the present application, the conductivity range of the insulating strip 400 is 1.00*10 -14 S / cm~1.00*10 -12 S / cm.

[0263] It is understandable that 1.00*10 -14 S / cm≤σ4≤1.00*10 -12 S / cm.

[0264] By adopting the technical solution of this embodiment, the design of the conductivity σ4 of the insulating strip 400 is more reasonable, which can better balance the production cost and insulation performance of the insulating strip 400.

[0265] In some embodiments, the value of σ4 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 σ4 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 -12 S / cm、5.00*10 -12 S / cm、1.00*10 -11 S / cm.

[0266] In another embodiment of the present application, referring to Figures 4 and 7, the box body 200 includes a heat exchange plate 23, which 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. The heat exchange plate 23 forms at least a portion of the box wall 201 of the box body 200, and the surface of the heat exchange plate 23 facing the battery cell 100 is covered with a first insulating coating 24.

[0267] 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.

[0268] The heat exchange plate 23 forms at least a portion of the box wall 201 of the box body 200. It can be understood that 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 second part The heat exchange plate 23 is mounted on the bottom wall 221 of the second portion 22, with the heat exchange plate 23 positioned between the bottom wall 221 of the second portion 22 and the battery cell 100, so that the heat exchange plate 23 and the bottom wall 221 of the second portion 22 together form the bottom wall of the housing 200. Alternatively, the heat exchange plate 23 is mounted on the top wall 211 of the first portion 21, with the heat exchange plate 23 positioned between the top wall 211 of the first portion 21 and the battery cell 100, so that the heat exchange plate 23 and the top wall 211 of the first portion 21 together form the top wall of the housing 200. That is, the first insulating coating 24, the second insulating coating 25, the insulating strip 400, and the insulating adhesive layer 300 can be sequentially disposed on the surface of the heat exchange plate 23 facing the battery cell 100.

[0269] 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 first 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.

[0270] In another embodiment of the present application, referring to FIG. 4 , the surface of the battery cell 100 facing the first insulating coating 24 is covered with a third insulating coating 13 .

[0271] The third insulating coating 13 may be a coating structure with insulating properties. The insulating coating is applied to the surface of the battery cell 100 facing the first insulating coating 24 to form the third insulating coating 13. For example, the insulating coating 13 may be applied, but is not limited to, by spraying, electrophoresis, or printing. The insulating coating may be made of, but is not limited to, resin or plastic. The surface of the battery cell 100 facing the first insulating coating 24 may be partially or fully covered with the third insulating coating 13.

[0272] By adopting this technical solution, the third insulating coating 13 can 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; the connection strength between the third insulating coating 13 and the battery cell 100 is good, and the third insulating coating 13 is not easy to fall off, which is beneficial to improving the insulation performance of the battery cell 100.

[0273] In some embodiments, the third insulating coating 13 can cover a portion of the outer surface 113 of the battery cell 100, or it can cover the entire area of ​​the outer surface 113 of the battery cell 100, that is, to achieve a fully wrapped insulation design of the outer shell 11 of the battery cell 100, and the insulation performance of the battery cell 100 is better.

[0274] 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 third insulating coating 13, an adhesive portion 31, an insulating strip 400, a second insulating coating 25 and a first 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.

[0275] 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 third insulating coating 13, an insulating strip 400, an adhesive portion 31, a second insulating coating 25 and a first 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 of devices with a voltage above 1500V.

[0276] 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 third insulating coating 13, an adhesive portion 31, an insulating strip 400, an adhesive portion 31, a second insulating coating 25 and a first 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.

[0277] In another embodiment of the present application, referring to Figures 8 to 12, the battery cell 100 includes a shell 11 and an electrode assembly 12 disposed in the shell 11. The shell 11 includes an outer surface 113 disposed back to the electrode assembly 12. The outer surface 113 is covered with a third insulating coating 13 at least in an area facing the first insulating coating 24.

[0278] The outer shell 11 refers to a shell 112 structure with a space inside to accommodate and protect the electrode assembly 12. The outer shell 11 can be made of a material with a certain hardness and strength, so that the outer shell 11 is not easily deformed when squeezed or collided, so that the battery cell 100 can have a higher structural strength and improved reliability. The material of the outer shell 11 can be a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The outer shell 11 defines the shape of the battery cell 100, and the outer surface 113 of the outer shell 11 is the outer surface 113 of the battery cell 100.

[0279] The electrode assembly 12 may refer to a component where an electrochemical reaction occurs within the battery cell 100 .

[0280] 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.

[0281] 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.

[0282] 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.

[0283] The area of ​​the outer surface 113 of the shell 11 facing the first insulating coating 24 is covered with the third insulating coating 13. It can be understood that a portion of the area of ​​the outer surface 113 of the shell 11 facing the first insulating coating 24 is covered with the third insulating coating 13, or the entire area of ​​the outer surface 113 of the shell 11 facing the first insulating coating 24 is covered with the third insulating coating 13.

[0284] At least the area of ​​the outer surface 113 facing the first insulating coating 24 is covered with a third insulating coating 13. It can be understood that the third insulating coating 13 can only cover the area of ​​the outer surface 113 of the outer shell 11 facing the first insulating coating 24, or it can cover other areas of the outer surface 113 of the outer shell 11, or even the entire area of ​​the outer surface 113 of the outer shell 11, that is, to achieve a fully wrapped insulation design of the outer shell 11 of the battery cell 100, and the insulation performance of the battery cell 100 is better.

[0285] By adopting the technical solution of this embodiment, the coating area of ​​the third insulating coating 13 can be flexibly set to meet different insulation requirements.

[0286] In other embodiments of the present application, referring to Figures 8 to 11, the battery cell 100 includes a shell 11 and an electrode assembly 12 disposed in the shell 11, the shell 11 includes an outer surface 113 disposed back to the electrode assembly 12, the outer surface 113 includes a plurality of side surfaces 1131, the plurality of side surfaces 1131 include a first side surface 11311, at least an edge area of ​​the first side surface 11311 is covered with a third insulating coating 13, and the other side surfaces 1131 except the first side surface 11311 are covered with the third insulating coating 13, and the third insulating coating 13 covering the first side surface 11311 and the third insulating coating 13 covering the other side surfaces 1131 except the first side surface 11311 are connected.

[0287] 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.

[0288] The first side surface 11311 may refer to one of the multiple side surfaces 1131 ; 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 the side surface of the housing 11 .

[0289] The edge area of ​​the first side 11311 may refer to the area of ​​the first side 11311 close to the other side 1131, that is, the peripheral area of ​​the first side 11311, and the edge area of ​​the first side 11311 is covered with the third insulating coating 13, or, the edge area and the middle area of ​​the first side 11311 are both covered with the third insulating coating 13; or, all areas of the first side 11311 are covered with the third insulating coating 13.

[0290] In the side surfaces 1131 other than the first side surface 11311, only a part of the side surface 1131 may be covered with the third insulating coating 13, or the entire side surface 1131 may be covered with the third insulating coating 13, but the first side surface 11311 and the other side surfaces 1131 covered with the third insulating coating 13 are connected, so that most areas of the shell 11 are covered with the third insulating coating 13.

[0291] By adopting the technical solution of this embodiment, the first side surface 11311 and the other side surfaces 1131 are both covered with the third insulating coating 13, and the third insulating coatings 13 are connected, so that most areas of the outer shell 11 are covered with the third insulating coating 13, the insulating area of ​​the battery cell 100 is large, and the insulating effect of the battery cell 100 is good.

[0292] In other embodiments of the present application, referring to FIG. 8 to FIG. 11 , all areas of the outer surface 113 except the first side surface 11311 are covered with a third insulating coating 13 .

[0293] Except for the side surfaces 1131 between the first side surfaces 11311, each side surface 1131 is fully covered with the third insulating coating 13, and the area between two adjacent side surfaces 1131 is also fully covered with the third 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 third insulating coating 13.

[0294] The shape of the outer shell 11 of the battery cell 100 may be a cylinder, a prism, a cuboid, etc.; when the outer shell 11 of the battery cell 100 is cylindrical 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 third insulating coating 13; when the outer shell 11 of the battery cell 100 is prism-shaped 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 surfaces parallel to the axis of the outer shell 11 are fully covered with the third insulating coating 13; when the outer shell 11 of the battery cell 100 is cuboid-shaped, the first side 11311 may be one of the side faces 1131 of the outer shell 11, and all surfaces other than the first side face 11311 are fully covered with the third insulating coating 13;

[0295] 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.

[0296] In other embodiments of the present application, referring to FIGS. 8 to 11 , the battery cell 100 includes an electrode terminal 14 for inputting or outputting electrical energy. The electrode terminal 14 is disposed on the first side surface 11311 .

[0297] 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.

[0298] The outer surface 113 is provided with a side surface 1131 of the electrode terminal 14 to form a first side surface 11311, wherein it may mean that two electrode terminals 14 are provided on the same side surface 1131, and the side surface 1131 is called the first side surface 11311; if two electrode terminals 14 are provided on two side surfaces 1131, then these two side surfaces 1131 are both called the first side surface 11311.

[0299] By adopting the technical solution of this embodiment, the third insulating coating 13 can be coated on the side 1131 where the electrode terminal 14 is provided. The coverage area of ​​the third insulating coating 13 is large, and the insulating area of ​​the battery cell 100 is large, which is beneficial to improving the insulation performance of the battery cell 100.

[0300] In other embodiments of the present application, referring to FIGS. 8 to 11 , when the battery cell 100 is in use, the top surface of the housing 11 forms a first side surface 11311 .

[0301] 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 .

[0302] By adopting the technical solution of this embodiment, the top surface of the shell 11 is also covered with the third insulating coating 13. The third 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.

[0303] In another embodiment of the present application, referring to Figures 8 to 11, 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 third insulating coating 13; wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0304] 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.

[0305] 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.

[0306] 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.

[0307] 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.

[0308] 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 FIG8 , 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 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.

[0309] The first side 11311 may be partially covered with the third insulating coating 13 or the entire area; the second side 11312 may be partially covered with the third insulating coating 13 or the entire area; the third side 11313 may be partially covered with the third insulating coating 13 or the entire area; the fourth side 11314 may be partially covered with the third insulating coating 13 or the entire area; the fifth side 11315 may be partially covered with the third insulating coating 13 or the entire area; the sixth side 11316 may be partially covered with the third insulating coating 13 or the entire area.

[0310] 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 a third 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.

[0311] In another embodiment of the present application, referring to FIG. 8 and FIG. 10 , the outer surface 113 further includes a connecting surface 1132 , and at least two adjacent side surfaces 1131 are connected by a connecting surface 1132 . At least one connecting surface 1132 is covered with a third insulating coating 13 .

[0312] The connecting surface 1132 may be a surface connecting 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 reliability of the battery cell 100.

[0313] 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.

[0314] At least one connection surface 1132 is covered with the third insulating coating 13. This may mean that a portion of the connection surface 1132 is covered with the third insulating coating 13, while another portion of the connection surface 1132 is not covered with the third insulating coating 13. Alternatively, all connection surfaces 1132 may be covered with the third insulating coating 13. This allows for a fully enclosed insulation design of the battery cell 100 housing 11, 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.

[0315] By adopting the technical solution of this embodiment, at least one connecting surface 1132 is provided with a third insulating coating 13 , which increases the insulating area of ​​the battery cell 100 and helps improve the insulation performance and pressure resistance of the battery cell 100 .

[0316] In some embodiments, as shown in Figure 7, multiple battery cells 100 are arranged in a rectangular shape in the box body 200, and the third 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 third 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.

[0317] In some embodiments, referring to Figures 8 and 12, 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.

[0318] 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.

[0319] 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.

[0320] 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.

[0321] 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.

[0322] In another embodiment of the present application, referring to FIG. 8 and FIG. 10 , the outer surface 113 further includes a connecting surface 1132 , and at least two adjacent side surfaces 1131 are connected by a connecting surface 1132 . At least one connecting surface 1132 is covered with a third insulating coating 13 .

[0323] The connecting surface 1132 may be a surface connecting 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 reliability of the battery cell 100.

[0324] Some adjacent side surfaces 1131 are connected via a connecting surface 1132 , while other adjacent side surfaces 1131 directly intersect with each other. Alternatively, 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.

[0325] At least one connection surface 1132 is covered with the third insulating coating 13. This may mean that a portion of the connection surface 1132 is covered with the third insulating coating 13, while another portion of the connection surface 1132 is not covered with the third insulating coating 13; alternatively, all connection surfaces 1132 are covered with the third insulating coating 13. The connection surface 1132 may be partially or fully covered with the third insulating coating 13. In this way, when all side surfaces 1131 and all connection surfaces 1132 are fully covered with the third 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.

[0326] 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 13, 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.

[0327] In another embodiment of the present application, referring to Figures 9 and 10, the battery cell 100 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 third insulating coating 13 is provided with a through hole 131 for the electrode terminal 14 to pass through.

[0328] 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.

[0329] The through-hole 131 may refer to a through-hole that penetrates the third 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 third 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 determined according to actual needs.

[0330] 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 third insulating coating 13. The coverage area of ​​the third insulating coating 13 is large, which is beneficial to improving the insulation performance of the battery cell 100.

[0331] 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.

[0332] In another embodiment of the present application, referring to FIG. 9 and FIG. 10 , the through holes 131 are arranged in a one-to-one correspondence with the electrode terminals 14 .

[0333] 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 third 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 can be tailored to actual needs.

[0334] By adopting the technical solution of this embodiment, the third 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 third insulating coating 13, which is beneficial to improving the insulation and withstand voltage effect of the battery cell 100.

[0335] In some embodiments, a plurality of electrode terminals 14 are disposed in the same through hole 131 .

[0336] In another embodiment of the present application, referring to FIG. 9 and FIG. 10 , the through hole 131 is provided to be gap-fitted with the electrode terminal 14 .

[0337] 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 .

[0338] By adopting the technical solution of this embodiment, a gap is formed between the electrode terminal 14 and the third insulating coating 13, reducing the risk of the third 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.

[0339] In another embodiment of the present application, referring to FIG. 9 and FIG. 10 , the maximum distance between the hole wall of the through hole 131 and the electrode terminal 14 is L, wherein 0 mm < L ≤ 3 mm.

[0340] 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.

[0341] By adopting the technical solution of this embodiment, the design of 0mm<L≤3mm reduces the risk of the third 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 shell 11 where the electrode terminal 14 is provided can be covered by the third insulating coating 13, which is beneficial to improving the insulation performance of the side 1131.

[0342] In another embodiment of the present application, referring to FIG. 9 and FIG. 10 , 0.3 mm ≤ L ≤ 2 mm.

[0343] By adopting the technical solution of this embodiment and the design of 0.3 mm ≤ L ≤ 2 mm, the spacing 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.

[0344] 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.

[0345] In another embodiment of the present application, referring to FIG. 12 , the battery cell 100 is covered with an insulating film 15 .

[0346] 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 .

[0347] For example, referring to Figures 8 and 12 , 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.

[0348] The insulating film 15 may be, but is not limited to, a blue film, a polypropylene film, or a polyethylene film.

[0349] 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.

[0350] By adopting the technical solution of this embodiment, the insulating film 15 can improve the insulation performance between the battery cell 100 and the box body 200, so that the insulation and voltage resistance performance of the battery 1100 is better.

[0351] In another embodiment of the present application, the third insulating coating 13 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.

[0352] The third 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, and the like.

[0353] In a possible implementation, the third insulating coating 13 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.

[0354] 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 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 third resin coating has good heat conduction performance, which can facilitate heat exchange of the battery cell 100.

[0355] 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 battery cell 100 still has good insulation performance, which is beneficial to improving the insulation reliability of the battery 1100.

[0356] In another possible embodiment, the third insulating coating 13 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 13 has a multi-layer structure; in the third 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 based on actual needs.

[0357] By adopting the technical solution of this embodiment, the third insulating coating 13 has a good insulation effect. In addition, the third 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 third insulating coating 13 can be flexibly selected to meet different usage requirements.

[0358] In another embodiment of the present application, the third insulating coating layer 13 includes a third resin coating layer, and the third resin coating layer includes a photosensitive resin coating layer.

[0359] The third 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.

[0360] 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 third insulating coating 13 and reducing the production cost of the battery cell 100.

[0361] In another embodiment 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.

[0362] The epoxy acrylate layer may refer to a coating structure made using epoxy acrylate.

[0363] The polyester acrylic resin layer may refer to a coating structure made using polyester acrylic resin.

[0364] The urethane acrylic resin layer may refer to a coating structure made using urethane acrylic resin.

[0365] The amino acrylic resin layer may refer to a coating structure made using amino acrylic resin.

[0366] The photoimageable alkali-soluble resin layer may refer to a coating structure made using a photoimageable alkali-soluble resin.

[0367] 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.

[0368] 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 to 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.

[0369] By adopting the technical solution of this embodiment, the third 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.

[0370] In another embodiment of the present application, referring to FIG. 4 , the thickness of the third insulating coating layer 13 is in the range of 10 μm to 800 μm.

[0371] It can be understood that the thickness of the third insulating coating 13 may refer to the distance between two opposite surfaces of the third insulating coating 13 in the thickness direction; the thickness of the third insulating coating 13 is h5, wherein 10 μm≤h5≤800 μm.

[0372] By adopting the technical solution of this embodiment, the layer thickness h5 of the third insulating coating 13 is reasonably set, so that the third 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 h5 of the third 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.

[0373] In another embodiment of the present application, referring to FIG. 4 , the thickness of the third insulating coating layer 13 is in the range of 70 μm to 140 μm.

[0374] It can be understood that 70 μm ≤ h5 ≤ 140 μm.

[0375] By adopting the technical solution of this embodiment, the layer thickness h5 of the third insulating coating 13 is set more reasonably, which can better take into account the insulation performance, production cost and heat exchange effect of the third insulating coating 13.

[0376] In some embodiments, the value of h5 may be 10 μm, 800 μm, or any number between 50 μm and 200 μm; for example, the value of h5 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.

[0377] In another embodiment of the present application, the conductivity range of the third insulating coating 13 is 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

[0378] It can be understood that the electrical conductivity of the third insulating coating 13 is σ5, where 1.00*10 -18 S / cm≤σ5≤1.00*10 -13 S / cm.

[0379] Conductivity is a physical quantity that describes a component's ability to conduct electricity. It's 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.

[0380] By adopting the technical solution of this embodiment, the electrical conductivity σ5 of the third insulating coating 13 is small, and the third insulating coating 13 has good insulation performance, so that the battery cell 100 has good insulation performance; in addition, the electrical conductivity σ5 of the third insulating coating 13 is not too small, so that the third insulating coating 13 can be made of relatively cheap materials, which is beneficial to reducing the production cost of the third insulating coating 13.

[0381] In another embodiment of the present application, the conductivity range of the third insulating coating 13 is 1.00*10 -17 S / cm~1.00*10 -14 S / cm.

[0382] It is understandable that 1.00*10 -17 S / cm≤σ5≤1.00*10 -14 S / cm.

[0383] By adopting the technical solution of this embodiment, the design of the conductivity σ5 of the third insulating coating 13 is more reasonable, which can better balance the production cost and insulation performance of the third insulating coating 13.

[0384] In some embodiments, the value of σ5 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 σ5 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.

[0385] In another embodiment of the present application, referring to FIG. 13 , an electrical device is provided, including the battery 1100 as described in the above embodiment.

[0386] 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.

[0387] The electrical device of the embodiment of the present application adopts the above-mentioned battery 1100. The battery 1100 has good insulation voltage resistance and insulation reliability, which is beneficial to improving the reliability of the electrical device and also beneficial to meeting the use requirements of high-voltage electrical devices.

[0388] For convenience of description, the electric device is described as a vehicle 1000 .

[0389] 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.

[0390] 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.

[0391] In another embodiment of the present application, referring to FIG. 14 , an energy storage device is provided, including the battery 1100 as described in the above embodiment.

[0392] 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 .

[0393] The energy storage device of the embodiment of the present application utilizes the aforementioned battery 1100. Battery 1100 has excellent insulation withstand voltage performance and insulation reliability, 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.

[0394] For the convenience of explanation, the energy storage device is taken as an energy storage container 2000 as an example.

[0395] 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.

[0396] In another embodiment of the present application, referring to FIG. 15 and FIG. 16 , a method for manufacturing a battery cell 100 is provided. The method for manufacturing the battery cell 100 is used to manufacture the battery cell 100 as described in the above embodiment. The method for manufacturing the battery cell 100 includes:

[0397] Installing the electrode assembly 12 into the housing 11;

[0398] An insulating coating material is applied to at least a portion of the outer surface 113 of the housing 11 to form a third insulating coating layer 13 .

[0399] 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 third insulating coating 13 .

[0400] The manufacturing method of the battery cell 100 in the embodiment of the present application places the production of the third insulating coating 13 after the electrode assembly 12 is installed in the outer shell 11, which can avoid damage to the third 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.

[0401] In another embodiment of the present application, referring to FIG. 15 and FIG. 16 , preparing the third insulating coating 13 includes preparing the third insulating coating 13 by using ultraviolet curing printing technology.

[0402] Ultraviolet (UV) curing printing, also known as UV (ultraviolet) printing, is a digital printing technology that uses ultraviolet light to cure the insulating coating, thereby producing the third 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 third insulating coating 13.

[0403] The UV printing technology takes a short time to produce the third insulating coating layer 13 , which is beneficial to shortening the production time of the battery cell 100 and reducing the production cost.

[0404] UV printing technology is set in the post-process of the battery cell 100, that is, the third insulating coating 13 is UV-printed after the electrode assembly 12 is installed in the shell 11. This can reduce the damage to the third insulating coating 13 caused by the assembly operation. The success rate of UV printing in one time can be greater than 95%, the yield rate of the battery cell 100 is high, and the production cost of the battery cell 100 can be reduced. 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.

[0405] 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.

[0406] By adopting the technical solution of this embodiment, the third 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 third insulating coating 13 produced using ultraviolet light curing printing technology has a good connection strength with the shell 11, and the third insulating coating 13 is not easy to fall off, thereby improving the insulation and voltage resistance performance of the battery cell 100.

[0407] 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 third insulating coating 13 in one step.

[0408] 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 to obtain a third insulating coating 13.

[0409] In another embodiment of the present application, referring to FIG. 15 and FIG. 16 , installing the electrode assembly 12 into the housing 11 includes:

[0410] Install the electrode assembly 12 into the shell 112 from the opening of the shell 112 of the outer shell 11;

[0411] 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 .

[0412] 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 installed 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; or 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, thereby producing the third insulating coating 13.

[0413] By adopting the technical solution of this embodiment, the third 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 third 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.

[0414] In another embodiment 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 method for manufacturing the battery cell 100 further includes:

[0415] Clean at least the area of ​​the outer surface 113 of the housing 11 that needs to be coated with insulating paint;

[0416] And / or, after forming the third insulating coating layer 13, the method for manufacturing the battery cell 100 further includes:

[0417] The insulation and withstand voltage performance of the battery cell 100 is tested to determine whether the battery cell 100 is qualified.

[0418] 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.

[0419] After the third 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.

[0420] 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.

[0421] 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 method for manufacturing the battery cell 100 further includes:

[0422] Clean at least the area of ​​the outer surface 113 of the housing 11 that needs to be coated with insulating paint;

[0423] In another possible embodiment, after forming the third insulating coating layer 13 , the method for manufacturing the battery cell 100 further includes:

[0424] The insulation and withstand voltage performance of the battery cell 100 is tested to determine whether the battery cell 100 is qualified.

[0425] 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 method for manufacturing the battery cell 100 further includes:

[0426] Clean at least the area of ​​the outer surface 113 of the housing 11 that needs to be coated with insulating paint;

[0427] After the third insulating coating 13 is prepared, the method further comprises:

[0428] The insulation and withstand voltage performance of the battery cell 100 is tested to determine whether the battery cell 100 is qualified.

[0429] 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.

[0430] In another embodiment of the present application, referring to FIG. 15 and FIG. 16 , the method for manufacturing the battery cell 100 further includes testing the insulation withstand voltage performance of the battery cell 100 . After forming the third insulating coating 13 and before testing the insulation withstand voltage performance of the battery cell 100 , the method for manufacturing the battery cell 100 further includes:

[0431] The layer thickness of the third insulating coating layer 13 was measured.

[0432] The thickness of the third insulating coating 13 can be measured in various ways, for example, using a handheld film thickness meter.

[0433] By adopting the technical solution of this embodiment, the thickness of the third insulating coating 13 is measured before the insulation withstand voltage test, so as to preliminarily confirm whether the insulation performance of the third insulating coating 13 meets the requirements. In this way, the insulation performance of the third insulating coating 13 can be understood in a timely manner, which is convenient for subsequent insulation withstand voltage performance testing.

[0434] The battery 1100 is described below with reference to some specific embodiments.

[0435] In this embodiment, referring to Figures 1 to 12, the battery 1100 includes a box body 200 and a battery cell 100. The battery cell 100 is located in the box body 200. The box body 200 includes a box wall 201. The surface of the box wall 201 facing the battery cell 100 is covered with a first insulating coating 24, a second insulating coating 25 and an insulating adhesive layer 300 in sequence. The first insulating coating 24 is located between the box wall 201 and the second insulating coating 25. The battery cell 100 is adhered to the insulating adhesive layer 300.

[0436] In this embodiment, the first insulating coating 24 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.

[0437] In the present embodiment, the first insulating coating layer 24 includes a first 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.

[0438] In this embodiment, the thickness of the first insulating coating layer 24 is in the range of 10 μm to 60 μm.

[0439] In this embodiment, the thickness of the first insulating coating layer 24 is in the range of 20 μm to 40 μm.

[0440] In this embodiment, the conductivity range of the first insulating coating 24 is 1.00*10 -17 S / cm~1.00*10 -13 S / cm.

[0441] In this embodiment, the conductivity range of the first insulating coating 24 is 1.00*10 -16 S / cm~1.00*10 -14 S / cm.

[0442] In this embodiment, the second insulating coating 25 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.

[0443] In this embodiment, the second insulating coating layer 25 includes a second resin coating layer, and the second 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.

[0444] In this embodiment, the thickness of the second insulating coating layer 25 is in the range of 60 μm to 700 μm.

[0445] In this embodiment, the thickness of the second insulating coating layer 25 is in the range of 140 μm to 450 μm.

[0446] In this embodiment, the conductivity range of the second insulating coating 25 is 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

[0447] In this embodiment, the conductivity range of the second insulating coating 25 is 1.00*10 -17 S / cm~1.00*10 -14 S / cm.

[0448] In this embodiment, the thermal conductivity of the second insulating coating 25 ranges from 0.1 W / (m·K) to 1.5 W / (m·K).

[0449] In this embodiment, the thermal conductivity of the second insulating coating 25 is in the range of 0.3 W / (m·K) to 1 W / (m·K).

[0450] In this embodiment, the thickness of the insulating adhesive layer 300 ranges from 500 μm to 3000 μm.

[0451] In this embodiment, the thickness of the insulating adhesive layer 300 is in the range of 700 μm to 1500 μm.

[0452] In this embodiment, the conductivity range of the insulating adhesive layer 300 is 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

[0453] In this embodiment, the conductivity range of the insulating adhesive layer 300 is 1.00*10 -16S / cm~1.00*10 -14 S / cm.

[0454] In this embodiment, the battery 1100 further includes an insulating strip 400 , which is embedded in the insulating adhesive layer 300 .

[0455] 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 battery cell 100 ; and / or, the adhesive portion 31 is provided between the insulating strip 400 and the second insulating coating 25 .

[0456] In this embodiment, in the direction from the second insulating coating 25 toward the battery cell 100 , the size of the insulating strip 400 ranges from 0.5 mm to 1.8 mm.

[0457] In this embodiment, in the direction from the second insulating coating 25 toward the battery cell 100 , the size of the insulating strip 400 ranges from 0.6 mm to 1.4 mm.

[0458] In this embodiment, the conductivity range of the insulating strip 400 is 1.00*10 -15 S / cm~1.00*10 -11 S / cm.

[0459] In this embodiment, the conductivity range of the insulating strip 400 is 1.00*10 -14 S / cm~1.00*10 -12 S / cm.

[0460] In this embodiment, the box body 200 includes a heat exchange plate 23, which 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; the heat exchange plate 23 forms at least a portion of the box wall 201, and the surface of the heat exchange plate 23 facing the battery cell 100 is covered with a first insulating coating 24.

[0461] In this embodiment, the battery cell 100 includes a housing 11 and an electrode assembly 12 disposed in the housing 11 . The housing 11 includes an outer surface 113 disposed away from the electrode terminal 14 . At least the area of ​​the outer surface 113 facing the first insulating coating 24 is covered with a third insulating coating 13 .

[0462] In this embodiment, the battery cell 100 includes a shell 11 and an electrode assembly 12 arranged in the shell 11, the shell 11 includes an outer surface 113 arranged back to the electrode terminal 14, 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 third insulating coating 13, and the other side surfaces 1131 except the first side surface 11311 are covered with the third insulating coating 13, and the third insulating coating 13 covering the first side surface 11311 and the third insulating coating 13 covering the other side surfaces 1131 except the first side surface 11311 are connected.

[0463] In this embodiment, all areas of the outer surface 113 except the first side surface 11311 are covered with the third insulating coating 13 .

[0464] In this embodiment, the battery cell 100 includes an electrode terminal 14 for inputting or outputting electrical energy. The electrode terminal 14 is disposed on the first side surface 11311 .

[0465] In this embodiment, when the battery cell 100 is in use, the top surface of the housing 11 forms a first side surface 11311 .

[0466] 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 third insulating coating 13; wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0467] 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 third insulating coating 13 .

[0468] In this embodiment, the battery cell 100 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 third insulating coating 13 is provided with a through hole 131 for allowing the electrode terminal 14 to pass through.

[0469] In this embodiment, the through holes 131 are disposed in a one-to-one correspondence with the electrode terminals 14 .

[0470] In this embodiment, the through hole 131 is provided to be gap-fitted with the electrode terminal 14 .

[0471] 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.

[0472] In this embodiment, 0.3 mm ≤ L ≤ 2 mm.

[0473] In this embodiment, the battery cell 100 is covered with an insulating film 15 .

[0474] In this embodiment, the third 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.

[0475] In this embodiment, the third insulating coating layer 13 includes a first resin coating layer, and the first resin coating layer includes a photosensitive resin coating layer.

[0476] 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.

[0477] In this embodiment, the thickness of the third insulating coating layer 13 is in the range of 10 μm to 800 μm.

[0478] In this embodiment, the thickness of the third insulating coating layer 13 is in the range of 70 μm to 140 μm.

[0479] In this embodiment, the conductivity range of the third insulating coating 13 is 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

[0480] In this embodiment, the conductivity range of the third insulating coating 13 is 1.00*10 -17 S / cm~1.00*10 -14 S / cm.

[0481] The manufacturing method of the battery cell 100 is described below with reference to some specific embodiments.

[0482] Example 1

[0483] In this embodiment, referring to FIG. 15 , the manufacturing method of the battery cell 100 includes:

[0484] Installing the electrode assembly 12 into the housing 11;

[0485] An insulating coating material is applied to at least a portion of the outer surface 113 of the housing 11 to form a third insulating coating layer 13 .

[0486] 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 method for manufacturing the battery cell 100 further includes:

[0487] Clean at least the area of ​​the outer surface 113 of the housing 11 that needs to be coated with insulating paint;

[0488] And / or, after forming the third insulating coating layer 13, the method for manufacturing the battery cell 100 further includes:

[0489] The insulation and withstand voltage performance of the battery cell 100 is tested to determine whether the battery cell 100 is qualified.

[0490] In this embodiment, the method for manufacturing the battery cell 100 further includes testing the insulation withstand voltage performance of the battery cell 100. After forming the third insulating coating 13 and before testing the insulation withstand voltage performance of the battery cell 100, the method for manufacturing the battery cell 100 further includes:

[0491] The layer thickness of the third insulating coating layer 13 was measured.

[0492] Example 2

[0493] 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:

[0494] Install the electrode assembly 12 into the shell 112 from the opening of the shell 112 of the outer shell 11;

[0495] 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 .

[0496] In this embodiment, preparing the third insulating coating layer 13 includes preparing the third insulating coating layer 13 by using ultraviolet curing printing technology.

[0497] 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, characterized in that: include: Battery cells; A box body, wherein the battery cell is located within the box body, the box body includes a box wall, and the surface of the box wall facing the battery cell is sequentially covered with a first insulating coating, a second insulating coating, and an insulating adhesive layer, the first insulating coating is located between the box wall and the second insulating coating, and the battery cell is adhered to the insulating adhesive layer.

2. The battery according to claim 1, wherein: 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.

3. The battery according to claim 2, wherein: The first insulating coating layer includes the first resin coating layer, and the first 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.

4. The battery according to any one of claims 1 to 3, characterized in that: The thickness of the first insulating coating layer ranges from 10 μm to 60 μm.

5. The battery according to claim 4, characterized in that: The thickness of the first insulating coating layer is in the range of 20 μm to 40 μm.

6. The battery according to any one of claims 1 to 5, characterized in that: The conductivity range of the first insulating coating is 1.00*10 -17 S / cm~1.00*10 -13 S / cm.

7. The battery according to claim 6, characterized in that: The conductivity range of the first insulating coating is 1.00*10 -16 S / cm~1.00*10 -14 S / cm.

8. The battery according to any one of claims 1 to 7, 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.

9. The battery according to claim 8, characterized in that: The second insulating coating layer includes a second 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.

10. The battery according to any one of claims 1 to 9, characterized in that: The thickness of the second insulating coating layer is in the range of 60 μm to 700 μm.

11. The battery according to claim 10, characterized in that: The second insulating coating layer has a thickness ranging from 140 μm to 450 μm.

12. The battery according to any one of claims 1 to 11, characterized in that: The conductivity range of the second insulating coating is 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

13. The battery according to claim 12, characterized in that: The conductivity range of the second insulating coating is 1.00*10 -17 S / cm~1.00*10 -14 S / cm.

14. The battery according to any one of claims 1 to 13, characterized in that: The thermal conductivity of the second insulating coating ranges from 0.1 W / (m·K) to 1.5 W / (m·K).

15. The battery according to claim 14, characterized in that: The thermal conductivity of the second insulating coating is in the range of 0.3 W / (m·K) to 1 W / (m·K).

16. The battery according to any one of claims 1 to 15, characterized in that: The thickness of the insulating adhesive layer ranges from 500 μm to 3000 μm.

17. The battery according to claim 16, characterized in that: The thickness of the insulating adhesive layer ranges from 700 μm to 1500 μm.

18. The battery according to any one of claims 1 to 17, characterized in that: The conductivity range of the insulating adhesive layer is 1.00*10 -18 S / cm~1.00*10 -13 S / cm.

19. The battery according to claim 18, characterized in that: The conductivity range of the insulating adhesive layer is 5.00*10 -16 S / cm~1.00*10 -14 S / cm.

20. The battery according to any one of claims 1 to 19, characterized in that: The battery further includes an insulating strip embedded in the insulating adhesive layer.

21. The battery according to claim 20, characterized in that: 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 second insulating coating layer.

22. The battery according to claim 21, characterized in that: In a direction from the second insulating coating layer toward the battery cell, a size of the insulating strip ranges from 0.5 mm to 1.8 mm.

23. The battery according to claim 22, characterized in that: In a direction from the second insulating coating layer toward the battery cell, a size of the insulating strip ranges from 0.6 mm to 1.4 mm.

24. The battery according to any one of claims 20 to 23, characterized in that: The conductivity range of the insulating strip is 1.00*10 -15 S / cm~1.00*10 -11 S / cm.

25. The battery according to claim 24, characterized in that: The conductivity range of the insulating strip is 1.00*10 -14 S / cm~1.00*10 -12 S / cm.

26. The battery according to any one of claims 1 to 25, characterized in that: The box body 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 cell; the heat exchange plate forms at least part of the box wall, and the surface of the heat exchange plate facing the battery cell is covered with the first insulating coating.

27. The battery according to any one of claims 1 to 26, characterized in that: The battery cell includes a shell and an electrode assembly disposed in the shell. The shell includes an outer surface disposed away from the electrode assembly. At least a region of the outer surface facing the first insulating coating is covered with a third insulating coating.

28. The battery according to any one of claims 1 to 27, characterized in that: The battery cell includes a shell and an electrode assembly arranged in the shell, the shell includes an outer surface arranged back to the electrode assembly, 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 third insulating coating, the other side surfaces except the first side surface are covered with the third insulating coating, and the third insulating coating covering the first side surface is connected to the third insulating coating covering the other side surfaces except the first side surface.

29. The battery according to claim 28, characterized in that: All areas of the outer surface except the first side surface are covered with a third insulating coating.

30. The battery according to claim 28 or 29, characterized in that: The battery cell includes an electrode terminal for inputting or outputting electric energy, and the electrode terminal is disposed on the first side surface.

31. The battery cell according to any one of claims 28 to 30, characterized in that: When the battery cell is in use, the top surface of the housing forms the first side surface.

32. The battery according to any one of claims 27 to 31, 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 the third insulating coating; wherein the first direction, the second direction and the third direction are perpendicular to each other.

33. The battery according to claim 32, 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 third insulating coating.

34. The battery according to any one of claims 27 to 33, characterized in that: The battery cell includes an electrode terminal for inputting or outputting electric energy, the electrode terminal is electrically connected to the electrode assembly, and the electrode terminal is connected to the shell; the third insulating coating is provided with a through hole for the electrode terminal to pass through.

35. The battery according to claim 34, characterized in that: The through holes are arranged in a one-to-one correspondence with the electrode terminals.

36. The battery according to claim 34 or 35, characterized in that: The through hole is gap-matched with the electrode terminal.

37. The battery according to claim 36, characterized in that: The maximum distance between the hole wall of the through hole and the electrode terminal is L, wherein 0mm<L≤3mm.

38. The battery according to claim 37, characterized in that: 0.3mm≤L≤2mm.

39. The battery according to any one of claims 1 to 38, characterized in that: The battery cell is covered with an insulating film.

40. The battery according to claims 27 to 39, 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.

41. The battery according to claim 40, characterized in that: The third insulating coating layer includes the third resin coating layer, and the third resin coating layer includes a photosensitive resin coating layer.

42. The battery according to claim 41, characterized in that: The photosensitive resin coating layer includes at least one of an epoxy acrylate resin layer, a polyurethane acrylate resin layer, a polyester acrylate resin layer, an amino acrylate resin layer, and a photoimageable alkali-soluble resin layer.

43. The battery according to any one of claims 27 to 42, characterized in that: The thickness of the third insulating coating layer ranges from 10 μm to 800 μm.

44. The battery according to claim 43, characterized in that: The thickness of the third insulating coating layer is in the range of 70 μm to 140 μm.

45. The battery according to any one of claims 27 to 44, characterized in that: The conductivity range of the third insulating coating is 1.00*10- 18 S / cm~1.00*10 -13 S / cm.

46. ​​The battery according to claim 45, characterized in that: The conductivity range of the third insulating coating is 1.00*10 -17 S / cm~1.00*10 -14 S / cm.

47. An electrical device, characterized in that: A battery comprising the battery according to any one of claims 1 to 46.

48. An energy storage device, characterized in that: A battery comprising the battery according to any one of claims 1 to 46.

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