Battery flame-retardant box
By applying a coating of water-based resin and flame retardant to the inside of the battery flame-retardant box, and combining it with composite materials and structural design, the problem of easy aging and corrosion of the flame-retardant box is solved, achieving excellent heat insulation and flame retardant performance, and improving transportation safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-11
- Publication Date
- 2026-04-14
AI Technical Summary
Existing flame-retardant boxes are prone to aging and corrosion when transporting used batteries, resulting in poor flame-retardant performance and low safety.
A flame-retardant coating is applied to the inner surface of the box and the cover. The coating consists of water-based resin and flame retardant, including ammonium polyphosphate, pentaerythritol or melamine, with a thickness of 0.6mm to 2.0mm, preferably 0.8mm. Inorganic fillers and defoamers may also be added to the coating. The box and the cover are made of composite materials and designed with through holes and grooves to relieve pressure and prevent overflow.
The flame-retardant box has improved corrosion and aging resistance, excellent heat insulation and flame retardant properties, ensures safety during transportation, prevents flame overflow and pressure relief, and enhances overall safety performance.
Smart Images
Figure CN121862971A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a flame-retardant battery box. Background Technology
[0002] During the recycling, transportation, or delivery process, used batteries may pose a risk of fire or explosion due to impacts or high temperatures. Currently, used batteries are typically placed in safe, flame-retardant boxes during recycling and express delivery.
[0003] However, existing flame-retardant boxes are prone to aging and corrosion, and have poor flame-retardant performance, which makes the safety of used batteries during transportation low. Summary of the Invention
[0004] In view of this, this application aims to at least partially solve one of the technical problems in the related art. To this end, this application provides a battery flame-retardant box with good corrosion and aging resistance, as well as excellent heat insulation and flame-retardant properties.
[0005] To solve the above-mentioned technical problems, this application is implemented as follows: According to one aspect of this application, this application provides a battery flame-retardant box, including: a box body and a cover; At least a portion of the inner surface of the housing and / or the cover is provided with a flame-retardant coating; The flame-retardant coating comprises a water-based resin and a flame retardant; the flame retardant comprises at least one of ammonium polyphosphate, pentaerythritol, or melamine.
[0006] In some embodiments, the thickness of the flame-retardant coating is 0.6 mm to 2.0 mm, preferably 0.8 mm.
[0007] In some embodiments, the flame-retardant coating further includes inorganic fillers and defoamers; Preferably, the inorganic filler includes at least one of titanium dioxide, kaolin, or talc; the defoamer includes an organosilicon defoamer. In some embodiments, the aqueous resin includes an aqueous acrylic resin.
[0008] In some of these embodiments, the flame-retardant coating comprises, by weight percentage: 30%~40% aqueous resin, 30%~50% flame retardant, 5%~15% inorganic filler, 1%~2% defoamer, and 15%~30% water.
[0009] In some of these embodiments, the flame-retardant coating is obtained by the following methods: A water-based resin and flame retardant are mixed to form a spraying liquid; The spraying liquid is sprayed onto at least a portion of the inner surface of the box and / or cover, and the flame-retardant coating is formed after drying. The flame retardant includes at least one of ammonium polyphosphate, pentaerythritol, or melamine.
[0010] In some embodiments, during the spraying process, the spray flow rate is 5.42 g / s to 6.42 g / s and the spray pressure is 0.35 MPa to 0.45 MPa.
[0011] In some embodiments, at 25°C to 30°C and 60% humidity, the viscosity of the spray liquid is 10 s / coat 4 cup to 30 s / coat 4 cup.
[0012] In some embodiments, the drying temperature is 80°C to 90°C, preferably 85°C; the drying time is 30 min to 60 min, preferably 60 min.
[0013] In some of these embodiments, the housing and / or the cover are made of a composite material; The composite material includes polyurethane resin and chopped glass fiber mat; Preferably, the polyurethane resin comprises an unsaturated polyester resin.
[0014] In some embodiments, the composite material further includes additives, inorganic flame retardants, and release agents; The additives include at least one of methyl ethyl ketone peroxide, cobalt naphthenate, or magnesium oxide; the inorganic flame retardant includes at least one of aluminum hydroxide or magnesium hydroxide; and the mold release agent includes zinc stearate.
[0015] In some of these embodiments, the composite material comprises, by weight parts: 100 parts unsaturated polyester resin, 45-60 parts chopped glass fiber mat, 80-120 parts inorganic flame retardant, 2.5-5 parts additives, and 1 part release agent.
[0016] In some embodiments, the enclosure includes side panels and a bottom panel; In the second and / or third direction, the side plate is provided with a groove facing into the housing; In a first direction, a through hole is provided on the side plate near the cover; a sealing groove is provided at the top of the side plate, and a sealing element is provided in the sealing groove.
[0017] In some embodiments, in a first direction, the size of the groove is smaller than the size of the side plate; the end of the groove near the cover has a through hole.
[0018] The technical solution of this application has at least the following beneficial effects: 1. In this application, a flame-retardant coating is provided on the inner surface of the box or cover. The flame-retardant coating includes a water-based resin and a flame retardant, and the flame retardant includes at least one of ammonium polyphosphate, pentaerythritol, or melamine. The flame-retardant box has good corrosion and aging resistance, as well as excellent heat insulation and flame-retardant properties.
[0019] 2. In some preferred embodiments of this application, in the first direction, any one or more side plates are provided with a groove leading into the interior of the box, and a through hole is provided at one end of the groove near the cover, that is, the through hole at the top of the groove is opposite to the cover. By providing the opening in the downward part in this way, if a fire breaks out in the flame-retardant box, the flame goes upward and the smoke flows down through the downward through hole, thereby preventing the open flame from overflowing and relieving pressure, so that the flame-retardant box has better safety performance.
[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0022] Figure 1 The diagram shown is a schematic diagram of the battery flame-retardant box structure provided in this application.
[0023] Figure 2 The diagram shown is a front view of the flame-retardant battery box provided in this application. Figure 1 .
[0024] Figure 3 The diagram shown is a front view of the flame-retardant battery box provided in this application. Figure 2 .
[0025] Figure 4 The image shown is of this application. Figure 3 A schematic diagram of the AA' section of the side plate is provided.
[0026] Explanation of reference numerals in the attached figures: 10 — Flame-retardant box; 100 – Box body; 110 – Side panel; 111 – Groove; 112 – Through hole; 113 – Sealing groove; 120 – Bottom plate; 200 – Cover.
[0027] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0028] The present application will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present application.
[0029] The endpoints and any values of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of the various ranges, the endpoint values of the various ranges or individual point values, and individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.
[0030] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.
[0031] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.
[0032] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.
[0033] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.
[0034] SMC (Sheet Molding Compound) composite material is a thermosetting composite material widely used in automotive, aerospace, construction, and piping industries. It is typically made from unsaturated polyester resin (UPR) or vinyl ester resin (VE) and materials such as glass fiber, calcium carbonate, and talc.
[0035] Generally, based on the combustion characteristics of lithium-ion batteries, taking lithium cobalt oxide single cells as an example, their highest reaction temperature is 800℃. Abnormal battery reactions are accompanied by smoke, flames, or fire. Therefore, the inner wall of the flame-retardant box must meet the flame-retardant requirement of around 1000℃. Simultaneously, because lithium-ion batteries contain electrolyte, leakage during combustion may corrode the flame-retardant box. Considering the need for lightweight flame-retardant boxes for easy handling during the initial transportation of used batteries, existing flame-retardant boxes are often made of non-metallic materials. Taking into account the lithium battery reaction time and safe rescue time, a flame torch is used to scorch the inner wall of the box at a flame temperature ≥1000℃ for 10 minutes to simulate abnormal combustion of lithium batteries within the flame-retardant box. The outer wall temperature of the box must not exceed 163℃. While existing SMC composite materials used to make flame-retardant boxes meet the V0 flame-retardant rating, they lack good thermal insulation properties under open flame or sustained high temperatures. The thermal conductivity of SMC materials can easily cause other packages to melt or catch fire.
[0036] In view of the technical problems existing in the prior art, this application provides a battery flame-retardant box with good corrosion and aging resistance, as well as excellent heat insulation and flame-retardant properties.
[0037] The specific technical solution of this application is as follows: In some embodiments of this application, a flame-retardant battery box is provided, comprising: a box body 100 and a cover 200; at least a portion of the inner surface of the box body 100 and / or the cover 200 is provided with a flame-retardant coating; the flame-retardant coating comprises a water-based resin and a flame retardant; the flame retardant comprises at least one of ammonium polyphosphate, pentaerythritol, or melamine.
[0038] As an example, it is understood that the box 100 has a storage space for storing used batteries, and the cover 200 is located at the opening of the box 100. The box 100 and the cover 200 can be connected by snap-fit, pin, or other connection methods to form a closed space. The materials of the box 100 and the cover 200 can be made of SMC material, and this embodiment does not make a specific limitation. The inner surfaces of the box 100 and the cover 200 are at least partially provided with a flame-retardant coating. In a preferred embodiment, the inner surfaces of both the box 100 and the cover 200 are provided with a flame-retardant coating of a certain thickness, so that the inner surface of the flame-retardant box 10 can still have good flame-retardant performance even when burning at around 1000°C.
[0039] It is understood that flame-retardant coatings include, but are not limited to, water-based resins and flame retardants. The water-based resin can be any one or more of water-based acrylic resins, water-based polyurethane resins, water-based epoxy resins, or water-based polyester resins, such as polyvinyl alcohol, sodium carboxymethyl cellulose, or polyvinyl acetate. The flame retardant can be one or more of organic or inorganic flame retardants. Organic flame retardants include, but are not limited to, ammonium polyphosphate, pentaerythritol, melamine, tetrabromobisphenol A (TBBPA), or triphenyl phosphate; inorganic flame retardants include, but are not limited to, magnesium hydroxide, aluminum hydroxide, zinc oxide, or barium hydroxide. By uniformly mixing water-based resin and flame retardant, the mixture can be applied to the inner surface of the box 100 or cover 200 through spraying, coating, or other methods. This gives the flame-retardant box 10 excellent flame-retardant properties. When the waste batteries inside the flame-retardant box 10 burn, the resulting flame will not cause the flame-retardant box 10 to burn. At the same time, it can effectively prevent the solution in the waste batteries from corroding the flame-retardant box, thus making the flame-retardant box 10 less prone to aging. It also has high safety performance when transporting waste batteries.
[0040] In some embodiments, the thickness of the flame-retardant coating is 0.6 mm to 2.0 mm, preferably 0.8 mm.
[0041] As an example, the thickness of the flame-retardant coating can be any one of 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2.0mm, or any value between any two. In a preferred embodiment, the thickness of the flame-retardant coating is 0.8mm. When the thickness of the flame-retardant coating is within the above range, the flame-retardant box 10 can have excellent flame-retardant performance. In a simulation test, the inner wall of the flame-retardant box 10 was sprayed with a flame at 1000°C for 10 minutes, and the inner wall of the flame-retardant box 10 did not burn, indicating good flame-retardant performance. If the thickness of the flame-retardant coating is less than the above range, it may affect the flame-retardant performance of the flame-retardant box 10; if the thickness of the flame-retardant coating is greater than the above range, it may make the flame-retardant coating too thick, which will reduce the adhesion between the flame-retardant coating and the inner wall of the flame-retardant box 10. During use, the flame-retardant box 10 may be subjected to collisions, etc., which may cause the flame-retardant coating to peel off from the inner wall of the flame-retardant box 10, thereby affecting the flame-retardant performance, corrosion resistance, etc. of the flame-retardant box.
[0042] In some embodiments, the flame-retardant coating further includes inorganic fillers and defoamers; preferably, the inorganic fillers include at least one of titanium dioxide, kaolin, or talc; and the defoamers include silicone defoamers.
[0043] As an example, flame-retardant coatings also include inorganic fillers and defoamers. Inorganic fillers include, but are not limited to, one or more of titanium dioxide, kaolin, or talc. Defoamers include, but are not limited to, silicone defoamers, such as polyether-modified siloxane defoamers, silicone defoamers, or silicone emulsion defoamers. By adding inorganic fillers and defoamers to the flame-retardant coating, the performance of the coating can be effectively improved. Inorganic fillers can ensure uniform dispersion of the flame retardant, thereby improving the overall flame-retardant performance of the coating. Simultaneously, inorganic fillers can effectively resist high temperatures and enhance the physical properties of the flame-retardant coating. When burned in a 1000℃ flame, they can effectively enhance the high-temperature resistance of the coating, making it less prone to deformation, such as indentation at the burning location, which would otherwise affect the performance of the flame-retardant coating.
[0044] In some embodiments, the aqueous resin includes an aqueous acrylic resin.
[0045] As an example, in a preferred embodiment, the water-based resin may include a water-based acrylic resin, which is made by polymerization of acrylic acid and its derivatives. The flame-retardant coating obtained by the water-based acrylic resin and flame retardants has good weather resistance, adhesion and mechanical properties, thereby improving the flame-retardant performance of the flame-retardant coating and giving the flame-retardant box excellent safety performance.
[0046] In some embodiments, the flame-retardant coating comprises, by weight percentage: 30% to 40% aqueous resin, 30% to 50% flame retardant, 5% to 15% inorganic filler, 1% to 2% defoamer, and 15% to 30% water.
[0047] As an example, by weight percentage, the aqueous resin in the flame-retardant coating can be any one of 30%, 32%, 33%, 34%, 35%, 36%, 38%, or 40%, or any value between any two; the flame retardant can be any one of 30%, 32%, 33%, 34%, 35%, 36%, 38%, 40%, 42%, 45%, 46%, 48%, or 50%, or any value between any two; the inorganic filler can be 5%, 7%, 8%, 10%, or 10%. The components can be any one of 1%, 12%, 13%, 14%, or 15%, or any value between any two; the defoamer can be any one of 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.6%, 1.8%, or 2.0%, or any value between any two; the water can be any one of 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 25%, 26%, 28%, or 30%, or any value between any two. By limiting the mass percentage ratio of the above components, the flame-retardant coating can have good adhesion, as well as excellent flame-retardant and mechanical properties, thereby improving the overall performance of the flame-retardant box. If the components are not within the above range, the flame-retardant performance of the flame-retardant coating may be improved, but its mechanical or adhesive properties may be reduced, making it easy to detach from the surface of the box 100 or shell 200, affecting the safety performance of the flame-retardant box.
[0048] In some embodiments, the flame-retardant coating is obtained by the following method: S101. Mix water-based resin and flame retardant to prepare a spraying liquid.
[0049] As an example, a spraying liquid is prepared by mixing and stirring water-based resin and flame retardant. During the preparation process, solvents such as water and ethanol can be added, and magnetic stirring can be used to ensure that the water-based resin and flame retardant are mixed evenly.
[0050] S102. The spraying liquid is sprayed onto at least a portion of the inner surface of the housing 100 and / or the cover 200, and a flame-retardant coating is formed after drying; wherein the flame retardant includes at least one of ammonium polyphosphate, pentaerythritol or melamine.
[0051] As an example, the coating liquid can be sprayed onto at least a portion of the inner surface of the housing 100 and / or the cover 200. In a preferred embodiment, a spray gun can be used for uniform spraying, with at least two coats. The distance between the spray gun and the inner surface of the housing 100 and / or the cover 200 should be 10cm to 25cm, the spray gun speed should be uniform, and the overlap area between the front and rear spray guns should be greater than 1 / 4. The drying method can be oven drying or freeze drying, and no specific limitation is made here.
[0052] In some embodiments, during the spraying process, the spray flow rate is 5.42 g / s to 6.42 g / s and the spray pressure is 0.35 MPa to 0.45 MPa.
[0053] As an example, during the spraying process, the spray flow rate can be any one of 5.42 g / s, 5.5 g / s, 5.6 g / s, 5.8 g / s, 6.0 g / s, 6.2 g / s, 6.3 g / s, 6.4 g / s, or 6.42 g / s, or any value between any two; the spray pressure can be any one of 0.35 MPa, 0.38 MPa, 0.40 MPa, 0.42 MPa, or 0.45 MPa, or any value between any two. By limiting the above parameters during the spraying process, the flame-retardant coating can be made to have a uniform thickness and density, thereby effectively improving the high-temperature resistance of the flame retardant in the flame-retardant box.
[0054] In some embodiments, at 25°C to 30°C and 60% humidity, the viscosity of the spray liquid is 10 s / coat 4 cup to 30 s / coat 4 cup.
[0055] As an example, under conditions of 25℃~30℃ and 60% humidity, the viscosity of the spray liquid can be any point value between any two of the following: 10s / Ford 4 cup, 10.2s / Ford 4 cup, 11s / Ford 4 cup, 12s / Ford 4 cup, 12.1s / Ford 4 cup, 12.2s / Ford 4 cup, 12.3s / Ford 4 cup, 12.4s / Ford 4 cup, 12.5s / Ford 4 cup, 12.8s / Ford 4 cup, 12.9s / Ford 4 cup, 15s / Ford 4 cup, 18s / Ford 4 cup, 20s / Ford 4 cup, 25s / Ford 4 cup, 28s / Ford 4 cup, or 30s / Ford 4 cup. "s / Ford 4 cup" refers to a viscosity unit, typically indicating the time unit obtained when measuring liquid viscosity using a Ford 4 cup viscometer, representing the time (in seconds) required for the liquid to flow from the Ford 4 cup. By limiting the viscosity of the spraying liquid, a smoother and denser flame-retardant coating can be formed. If the viscosity of the spraying liquid is too high or too low, the smoothness of the flame-retardant coating may be affected, thus affecting the overall performance.
[0056] In some embodiments, the drying temperature is 80°C to 90°C, preferably 85°C; the drying time is 30 min to 60 min, preferably 60 min.
[0057] As an example, the drying temperature can be any one of 80℃, 83℃, 85℃, 88℃ or 90℃ or any value between any two; the drying time can be any one of 30min, 40min, 50min or 60min or any value between any two; by limiting the above-mentioned drying temperature and time range, the flame-retardant coating can be well bonded to the inner surface of the box 100 and the cover 200, thereby giving the flame-retardant box better flame-retardant performance and heat insulation performance.
[0058] In some embodiments, the housing 100 and / or the cover 200 are made of a composite material; the composite material includes polyurethane resin and chopped glass fiber mat; preferably, the polyurethane resin includes unsaturated polyester resin.
[0059] As an example, it is understood that the composite material includes, but is not limited to, polyurethane resin and chopped fiberglass mat, wherein the unsaturated polyester resin is formed by replacing some ester bonds in a saturated polyester (such as polyethylene terephthalate, PET) with unsaturated double bonds. The flame-retardant box 10 made from the above composite material has excellent thermal insulation properties. When a fire occurs inside the flame-retardant box 10, its good thermal insulation properties prevent heat transfer to other flame-retardant boxes or other devices, thus preventing the spread of fire. For example, if a waste battery burns inside one of the multiple flame-retardant boxes 10, its excellent thermal insulation properties will prevent the transfer of a large amount of heat that could cause adjacent flame-retardant boxes 10 to also burn, thus providing good safety performance.
[0060] In some embodiments, the composite material further includes additives, inorganic flame retardants, and release agents; the additives include at least one of methyl ethyl ketone peroxide, cobalt naphthenate, or magnesium oxide; the inorganic flame retardants include at least one of aluminum hydroxide or magnesium hydroxide; and the release agents include zinc stearate.
[0061] As an example, additives in the composite material include, but are not limited to, one or more of methyl ethyl ketone peroxide, cobalt naphthenate, or magnesium oxide; inorganic flame retardants include, but are not limited to, one or more of magnesium hydroxide or aluminum hydroxide; and release agents include, but are not limited to, zinc stearate. Adding these components to the composite material can give the flame-retardant box good structural strength, making it less prone to deformation during installation and handling, while also providing better thermal insulation performance.
[0062] In some embodiments, the composite material comprises, by weight parts: 100 parts unsaturated polyester resin, 45 to 60 parts chopped glass fiber mat, 80 to 120 parts inorganic flame retardant, 2.5 to 5 parts additives, and 1 part release agent.
[0063] As an example, by weight, the unsaturated polyester resin in the composite material can be 100 parts, the chopped glass fiber mat can be any one of 45 parts, 50 parts, 55 parts, or 60 parts, or any value between any two; the inorganic flame retardant can be any one of 80 parts, 85 parts, 90 parts, 95 parts, 100 parts, 105 parts, 110 parts, 105 parts, 110 parts, 115 parts, or 120 parts, or any value between any two; the additive can be any one of 2.5 parts, 3 parts, 3.5 parts, 3.8 parts, 4 parts, 4.2 parts, 4.5 parts, or 5 parts, or any value between any two; and the release agent can be 1 part. The flame-retardant box 10 prepared with the above components has good heat insulation performance. When burned at 1000°C inside the flame-retardant box with the flame-retardant coating, the temperature of the outer surface of the flame-retardant box is below 163°C after 10 minutes.
[0064] It is understood that the above-mentioned composite material can be made into a flame-retardant box by first mixing the above components in proportion using an open mill or internal mixer, or by granulating using a twin-screw extruder, and then using a die-casting process. The parameters of the above-mentioned instruments can be adjusted by those skilled in the art according to this application, and no specific limitations are made in this application.
[0065] In some embodiments, the housing 100 includes a side plate 110 and a bottom plate 120; in the second and / or third direction, the side plate 110 is provided with a groove 111 into the housing 100; in the first direction, the side plate 110 near the cover 200 is provided with a through hole 112; the top of the side plate 110 is provided with a sealing groove 113, and a sealing element is provided in the sealing groove 113.
[0066] refer to Figure 1 , Figure 2 and Figure 3The box 100 includes side plates 110 and a bottom plate 120. Multiple side plates 110 and bottom plates 120 can be assembled to form a box 100 with an open end. In the second and / or third direction, the side plates 110 have grooves 111 extending into the box 100. That is, the grooves 111 recess into the box 100 to form protrusions. Viewed from the outside of the box 100, the grooves 111 are visible. These grooves 111 can, to a certain extent, securely hold the used batteries inside the box 100, preventing them from shifting within the box during transportation and handling, thus enhancing its safety performance. In the first direction, a through hole 112 can be provided at the end of the side plate 110 near the cover 200. If the lithium battery reacts abnormally and produces a large amount of smoke, the box has a gas venting function, preventing an increase in internal pressure and the risk of explosion. The top of the side plate 110 is provided with a sealing groove 113, and a sealing element is provided in the sealing groove 113. For example, the sealing element can be solid nitrile rubber, wherein the rubber content is ≥80%. By nesting and pressing the sealing element in the sealing groove 113, a simple sealing effect can be achieved.
[0067] In some embodiments, in the first direction, the size of the groove 111 is smaller than the size of the side plate 110; the end of the groove 111 near the cover 200 is provided with a through hole 112.
[0068] refer to Figure 4 As an example, in the first direction, the size of the groove 111 is smaller than the size of the side plate 110, and a through hole 112 is provided at one end of the groove 111 near the cover 200. That is, the through hole 112 at the top of the groove 111 is opposite to the cover 200. With this arrangement, the opening is set in the downward part. If a fire breaks out in the flame retardant box, the flame goes upward and the smoke flows down through the downward through hole 112, which realizes the prevention of open flame overflow and pressure relief, so that the flame retardant box has better safety performance.
[0069] In some embodiments, the flame-retardant box 10 includes a box body 100 and a cover 200. A groove 111 is provided on any side plate 110 of the box body 100, extending into the interior of the box body 100. In a first direction, a through hole 112 is provided at one end of the groove 111 near the cover 200. A sealing groove 113 is provided at the top of the side plate 110, and a sealing element is provided in the sealing groove 113. The box body 100 and the cover 200 are made of unsaturated polyester resin, chopped glass fiber felt, flame retardant aluminum hydroxide, methyl ethyl ketone peroxide, cobalt naphthenate, magnesium oxide, zinc stearate, and color powder. The inner surface of the flame-retardant box 10 is also provided with a flame-retardant coating, which is made of water-based acrylic resin, ammonium polyphosphate (APP), pentaerythritol (PER), melamine, titanium dioxide (TiO2) or kaolin or talc, silicone defoamer, and deionized water. This flame-retardant box has excellent flame-retardant and heat-insulating properties. At the same time, it can also prevent open flame spillage and relieve pressure, making the flame-retardant box have superior safety performance.
[0070] Since the battery provided in this embodiment of the invention adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.
[0071] The present invention will be described in detail below with reference to the accompanying drawings and examples. However, the implementation and protection of the present invention are not limited thereto. The following embodiments are only some embodiments of the present invention and are not intended to limit the present invention.
[0072] Example 1 In Example 1, the composite material, by weight, consists of: 100 parts unsaturated polyester resin, 60 parts chopped glass fiber mat, 120 parts aluminum hydroxide, 2 parts methyl ethyl ketone peroxide, 1 part cobalt naphthenate, 2 parts magnesium oxide, and 1 part zinc stearate.
[0073] The above materials are mixed in proportion, extruded and granulated using a twin-screw extruder, and then a flame-retardant box is made. A flame-retardant coating is then uniformly sprayed inside the flame-retardant box.
[0074] Flame-retardant coatings are obtained by the following methods: S11. Mix the following components in the specified proportions to prepare a spraying liquid.
[0075] S12. The spraying liquid is sprayed onto the inner surface of the flame-retardant box, and after drying, a flame-retardant coating is formed. Under the conditions of 29°C and 60% humidity, the viscosity of the spraying liquid is 13s / Ford 4 cup; the drying temperature is 85°C; and the drying time is 60 minutes. The thickness of the flame-retardant coating is 0.8mm.
[0076] The spraying liquid, by weight percentage, comprises: 35% water-based acrylic resin, 20% ammonium polyphosphate, 15% pentaerythritol, 5% melamine, 8% talc, 2% silicone defoamer, and 15% deionized water.
[0077] Example 2 The only difference in Example 2 is that, by mass percentage, the spray liquid comprises: 30% water-based acrylic resin, 23% ammonium polyphosphate, 15% pentaerythritol, 5% melamine, 10% talc, 2% silicone defoamer, and 15% deionized water.
[0078] Example 3 The only difference in Example 3 is that, by mass percentage, the spray liquid comprises: 35% water-based acrylic resin, 20% ammonium polyphosphate, 10% pentaerythritol, 5% melamine, 8% talc, 2% silicone defoamer, and 20% deionized water.
[0079] Example 4 The only difference in Example 4 is that, by mass percentage, the spray liquid comprises: 35% water-based acrylic resin, 20% ammonium polyphosphate, 10% pentaerythritol, 5% melamine, 12% talc, 2% silicone defoamer, and 16% deionized water.
[0080] Example 5 The only difference in Example 5 is that the composite material used is: 100 parts unsaturated polyester resin, 55 parts chopped glass fiber mat, 110 parts aluminum hydroxide, 1 part methyl ethyl ketone peroxide, 1 part cobalt naphthenate, 2 parts magnesium oxide and 1 part zinc stearate.
[0081] Example 6 The only difference in Example 6 is that the composite material used is: 100 parts unsaturated polyester resin, 45 parts chopped glass fiber mat, 100 parts aluminum hydroxide, 1 part methyl ethyl ketone peroxide, 1 part cobalt naphthenate, 2 parts magnesium oxide and 1 part zinc stearate.
[0082] Comparative Example 1 The only difference in Comparative Example 1 is that no flame-retardant coating is applied in Comparative Example 1.
[0083] Comparative Example 2 The only difference in Comparative Example 2 is that the thickness of the flame-retardant layer is 0.5 mm.
[0084] Performance testing: A flame gun was used to scorch the inner wall of the flame-retardant box at a flame temperature of not less than 1000℃. The box wall was required not to burn through or melt the outer shell within 10 minutes, and the outer wall temperature corresponding to the scorching point should be less than 163℃. The specific test results are shown in Table 1 below.
[0085] Table 1. Test Results: As can be seen from Table 1, when the flame-retardant box prepared by the present invention is burned with a flame gun, the box shell remains intact and the outer wall temperature is low, thus preventing adjacent flame-retardant boxes from burning; compared with the flame-retardant boxes in Comparative Examples 1 and 2, it has good comprehensive performance.
[0086] The parts not described in detail in this application are techniques known to those skilled in the art.
[0087] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.
[0088] It should be noted that the terms "and / or" or " / " used herein are merely descriptions of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The singular forms "a," "the," and "the" used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.
[0089] In the detailed description and claims, a list of items connected by the terms "at least one of," "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may contain a single element or multiple elements. Item B may contain a single element or multiple elements. Item C may contain a single element or multiple elements.
[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A flame-retardant battery case, characterized in that, include: Box body (100) and lid (200); The inner surfaces of the housing (100) and / or the cover (200) are at least partially provided with a flame-retardant coating; The flame-retardant coating comprises a water-based resin and a flame retardant; the flame retardant comprises at least one of ammonium polyphosphate, pentaerythritol, or melamine.
2. The battery flame-retardant box according to claim 1, characterized in that, Satisfying at least one of features (1) to (3): (1) The thickness of the flame-retardant coating is 0.6 mm to 2.0 mm, preferably 0.8 mm; (2) The flame-retardant coating also includes inorganic fillers and defoamers; Preferably, the inorganic filler includes at least one of titanium dioxide, kaolin, or talc; the defoamer includes an organosilicon defoamer. (3) The water-based resin includes water-based acrylic resin.
3. The battery flame-retardant box according to claim 2, characterized in that, The flame-retardant coating comprises, by weight percentage: 30%~40% aqueous resin, 30%~50% flame retardant, 5%~15% inorganic filler, 1%~2% defoamer, and 15%~30% water.
4. The battery flame-retardant box according to claim 1, characterized in that, The flame-retardant coating is obtained by the following method: A water-based resin and flame retardant are mixed to form a spraying liquid; The spraying liquid is sprayed onto at least a portion of the inner surface of the housing (100) and / or the cover (200), and the flame-retardant coating is formed after drying. The flame retardant includes at least one of ammonium polyphosphate, pentaerythritol, or melamine.
5. The battery flame-retardant box according to claim 4, characterized in that, Satisfying at least one of features (1) to (3): (1) During the spraying process of the spraying liquid, the spray flow rate is 5.42 g / s to 6.42 g / s and the spray pressure is 0.35 MPa to 0.45 MPa; (2) Under the conditions of 25℃~30℃ and humidity of 60%, the viscosity of the spraying liquid is 10s / coating cup 4 to 30s / coating cup 4; (3) The drying temperature is 80℃~90℃, preferably 85℃; the drying time is 30min~60min, preferably 60min.
6. The battery flame-retardant box according to claim 1, characterized in that, The housing (100) and / or the cover (200) are made of composite materials; The composite material includes polyurethane resin and chopped glass fiber mat; Preferably, the polyurethane resin comprises an unsaturated polyester resin.
7. The battery flame-retardant box according to claim 6, characterized in that, The composite material also includes additives, inorganic flame retardants, and release agents; The additives include at least one of methyl ethyl ketone peroxide, cobalt naphthenate, or magnesium oxide; the inorganic flame retardant includes at least one of aluminum hydroxide or magnesium hydroxide; and the mold release agent includes zinc stearate.
8. The battery flame-retardant box according to claim 7, characterized in that, The composite material comprises, by weight parts: 100 parts unsaturated polyester resin, 45-60 parts chopped glass fiber mat, 80-120 parts inorganic flame retardant, 2.5-5 parts additives, and 1 part release agent.
9. The battery flame-retardant box according to any one of claims 1 to 8, characterized in that, The enclosure (100) includes a side panel (110) and a bottom panel (120); In the second and / or third direction, the side plate (110) is provided with a groove (111) into the housing (100). In the first direction, a through hole (112) is provided on the side plate (110) near the cover (200); a sealing groove (113) is provided at the top of the side plate (110), and a sealing element is provided in the sealing groove (113).
10. The battery flame-retardant box according to claim 9, characterized in that, In the first direction, the size of the groove (111) is smaller than the size of the side plate (110); the groove (111) has a through hole (112) at one end near the cover (200).