Flame-retardant lithium battery

Abstract

The utility model discloses a flame-retardant lithium battery which comprises an explosion-proof outer shell and a lithium battery core body, the lithium battery core body is arranged in the inner space of the explosion-proof outer shell, a heat dissipation layer is wrapped outside the lithium battery core body, a flame-retardant belt is wrapped on the surface of one side, far away from the lithium battery core body, of the heat dissipation layer, and the flame-retardant belt is arranged in a multi-layer flame-retardant composite mode. The surface of one side, far away from the heat dissipation layer, of the flame-retardant belt is wrapped with a heat insulation layer, the surface of one side, far away from the flame-retardant belt, of the heat insulation layer is connected with the inner wall of the explosion-proof outer shell, the top of the explosion-proof outer shell is provided with a top cover through an assembly mechanism, the top of the lithium battery core is provided with a positive pole through a positive electrode plate, and the upper end of the positive pole is arranged at the top of the top cover. By arranging a series of structures, good heat dissipation, flame retardance and heat insulation performance are achieved, the flame retardant belts are composited in a multi-layer mode, the flame retardant belts not only have good flame retardance, but also are high in viscosity, the supporting structure strength and the tensile strength are high, and the explosion-proof outer shell and the top cover are assembled in an anti-seepage and sealed mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, concretely is a kind of flame-retardant lithium battery. BACKGROUND

[0002] Lithium battery is a kind of by lithium metal or lithium alloy as positive / negative electrode material, using non-aqueous electrolyte solution battery, lithium battery market prospect is very broad, due to the chemical characteristics of lithium metal is very active, make the processing, preservation, use of lithium metal, the requirement to environment is very high.With the development of science and technology, lithium battery has become mainstream.

[0003] At present, lithium battery is usually set between shell body and lithium battery core single layer of flame-retardant layer and carry out battery flame-retardant, single layer of flame-retardant layer flame-retardant effect is general, and the structural connection strength between flame-retardant layer and other structural layers of battery is poor, and the sealing of the plane contact assembly between the top cover of lithium battery and shell body is poor, and the assembly requirement is high. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of flame-retardant lithium battery to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of flame-retardant lithium battery, including explosion-proof shell body and lithium battery core, the inside space of explosion-proof shell body is equipped with lithium battery core, the outside of lithium battery core is wrapped with heat dissipation layer, the surface of the side, away from lithium battery core of heat dissipation layer, is wrapped with flame-retardant band, the flame-retardant band is with multilayer flame-retardant composite setting, the surface of the side, away from heat dissipation layer of flame-retardant band, is wrapped with heat insulation layer, the surface of the side, away from flame-retardant band of heat insulation layer, is connected with the inner wall of explosion-proof shell body, the top of explosion-proof shell body is equipped with top cover by assembly mechanism, the top of lithium battery core is equipped with positive pole by positive electrode sheet, the upper end of positive pole is equipped in the top of top cover.

[0006] Preferably, the flame-retardant band includes a substrate layer, a flame-retardant layer, a polyester fiber layer, and a flame-retardant adhesive layer. One side of the substrate layer is connected with the heat dissipation layer. The other side of the substrate layer is provided with the flame-retardant layer. The side, away from the substrate layer, of the flame-retardant layer is provided with the polyester fiber layer. The side, away from the flame-retardant layer, of the polyester fiber layer is provided with the flame-retardant adhesive layer. The side, away from the polyester fiber layer, of the flame-retardant adhesive layer is connected with the heat insulation layer.

[0007] Preferably, the assembly mechanism includes an assembly table, an assembly groove, an assembly hole, an internal screw, and a sealing compression ring. The top of the explosion-proof shell body is provided with the assembly table. The edge of the bottom of the top cover is provided with the assembly groove. The top cover on the top of the assembly groove and the assembly table is provided with the assembly hole. The assembly table is arranged in the assembly groove and fixed with the top cover through the internal screw in the assembly hole. The sealing compression ring is arranged between the assembly table and the top cover.

[0008] Preferably, the assembly platform is arranged with a downward inclined slope on the side away from the lithium battery core, and a slot is formed between the assembly platform and the assembly pressure groove, with the sealing pressure ring disposed inside the slot.

[0009] Preferably, the substrate layer is made of PET material, and the surface of the substrate layer away from the flame retardant layer has a uniformly distributed granular structure. The thickness of the substrate layer (41) is 20-35 μm, the thickness of the flame retardant layer is 20-30 μm, the thickness of the polyester fiber layer is 15-30 μm, the thickness of the flame retardant adhesive layer is 10-20 μm, and a flame retardant is provided between the flame retardant adhesive layer and the polyester fiber layer.

[0010] Preferably, the heat dissipation layer is made of thermally conductive carbon fiber, and the heat dissipation layer has a spiral-shaped heat-conducting pipe inside.

[0011] Preferably, the heat insulation layer is made of silica aerogel, and the thickness of the heat insulation layer is 35-55 μm.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This flame-retardant lithium battery, through the heat dissipation layer, flame-retardant strip, and heat insulation layer set between the explosion-proof shell and the lithium battery core, has good heat dissipation, flame retardant and heat insulation performance. The flame-retardant strip is a multi-layer composite of a substrate layer, a flame-retardant layer, a polyester fiber layer and a flame-retardant adhesive layer. The flame-retardant strip not only has good flame retardancy for the lithium battery, but also has strong adhesion. The polyester fiber provides the supporting structural strength and tensile strength of the flame-retardant strip, increasing the stability of the lithium battery structure.

[0014] 2. This flame-retardant lithium battery uses an assembly mechanism between the top cover and the explosion-proof housing. The assembly platform on the top of the explosion-proof housing cooperates with the assembly groove at the bottom of the top cover. The assembly between the top cover and the explosion-proof housing is achieved by internal bolts. A sealing ring is set in the groove formed between the assembly platform and the assembly groove. The assembly platform has a sloping structure with the inside higher than the outside. The assembly between the explosion-proof housing and the top cover is leak-proof and sealed. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the flame-retardant layer in this utility model;

[0017] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A;

[0018] Figure 4 This is a schematic diagram of the assembly platform in this utility model.

[0019] In the diagram: 1. Explosion-proof outer shell; 2. Lithium battery core; 3. Heat dissipation layer; 4. Flame retardant strip; 41. Substrate layer; 42. Flame retardant layer; 43. Polyester fiber layer; 44. Flame retardant adhesive layer; 5. Heat insulation layer; 6. Assembly mechanism; 61. Assembly platform; 62. Assembly groove; 63. Assembly hole; 64. Inner bolt; 65. Sealing ring; 7. Top cover; 8. Positive electrode post. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] like Figures 1 to 4 As shown, the flame-retardant lithium battery of this embodiment includes an explosion-proof housing 1 and a lithium battery core 2. The lithium battery core 2 is disposed in the internal space of the explosion-proof housing 1. A heat dissipation layer 3 is wrapped around the outside of the lithium battery core 2. A flame-retardant strip 4 is wrapped around the surface of the heat dissipation layer 3 away from the lithium battery core 2. The flame-retardant strip 4 is made of multiple layers of flame-retardant composite. A heat insulation layer 5 is wrapped around the surface of the flame-retardant strip 4 away from the heat dissipation layer 3. The surface of the heat insulation layer 5 away from the flame-retardant strip 4 is connected to the inner wall of the explosion-proof housing 1. A top cover 7 is provided on the top of the explosion-proof housing 1 through an assembly mechanism 6. A positive electrode post 8 is provided on the top of the lithium battery core 2 through a positive electrode sheet. The upper end of the positive electrode post 8 is located on the top of the top cover 7. The lithium battery has good heat dissipation, flame retardant and heat insulation performance. The flame-retardant strip 4 is multi-layer composite. The flame-retardant strip 4 not only has good flame retardancy for the lithium battery, but also has strong adhesion. The assembly between the explosion-proof housing 1 and the top cover 7 is leak-proof and sealed.

[0023] Specifically, the fire-retardant tape 4 comprises a substrate layer 41, a fire-retardant layer 42, a polyester fiber layer 43 and a fire-retardant adhesive layer 44, one side of the substrate layer 41 is connected with the heat dissipation layer 3, the other side of the substrate layer 41 is provided with the fire-retardant layer 42, the side of the fire-retardant layer 42 away from the substrate layer 41 is provided with the polyester fiber layer 43, the side of the polyester fiber layer 43 away from the fire-retardant layer 42 is provided with the fire-retardant adhesive layer 44, the fire-retardant adhesive layer 44 away from the polyester fiber layer 43 is connected with the heat insulation layer 5, and the lithium battery has good heat dissipation, fire-retardant and heat insulation performance.

[0024] Further, the assembly mechanism 6 comprises an assembly table 61, an assembly pressure groove 62, an assembly hole 63, an internal screw 64 and a sealing compression ring 65, the top of the explosion-proof outer shell 1 is provided with the assembly table 61, the edge of the bottom of the top cover 7 is provided with the assembly pressure groove 62, the top cover 7 on the top of the assembly pressure groove 62 and the assembly table 61 on the top cover 7 are provided with the assembly hole 63, the assembly table 61 is arranged in the assembly pressure groove 62 and is fixed with the top cover 7 through the internal screw 64 in the assembly hole 63, and the sealing compression ring 65 is arranged between the assembly table 61 and the top cover 7, so that the assembly of the top cover 7 and the explosion-proof outer shell 1 is convenient and the sealing ring is good.

[0025] Further, the side of the assembly table 61 away from the lithium battery core 2 is provided in an inclined downward inclined surface structure, the assembly table 61 is provided in an inclined surface structure with an inner height and an outer low, the assembly table 61 can block and prevent seepage at the assembly position, a clamping groove is formed between the assembly table 61 and the assembly pressure groove 62, the sealing compression ring 65 is arranged in the inside of the clamping groove, the sealing compression ring 65 is clamped in the clamping groove, and the sealing compression ring 65 is stable.

[0026] Further, the substrate layer 41 is made of PET material, the surface of the side of the substrate layer 41 away from the fire-retardant layer 42 is provided with uniformly distributed particle structures, the surface of the side of the substrate layer 41 provided with the particle structures is provided with adhesive glue, the connection of the substrate layer 41 and the heat dissipation layer 3 is increased, the thickness of the substrate layer 41 is 20-35μm, the thickness of the fire-retardant layer 42 is 20-30μm, the thickness of the polyester fiber layer 43 is 15-30μm, the polyester fiber provides the support structure strength and tensile resistance of the fire-retardant tape 4, the thickness of the fire-retardant adhesive layer 44 is 10-20μm, the fire-retardant agent is arranged between the fire-retardant adhesive layer 44 and the polyester fiber layer 43, and the fire-retardant agent strengthens the fire-retardant property of the fire-retardant tape 4.

[0027] Further, the heat dissipation layer 3 is made of a heat-conducting carbon fiber layer, the inside of the heat dissipation layer 3 is provided with a heat-conducting pipe in a spiral structure, one end of the heat-conducting pipe penetrates through the fire-retardant layer 4 and the heat insulation layer 5 and is arranged on the explosion-proof outer shell 1, and the heat dissipation layer 3 has heat dissipation performance.

[0028] Further, the heat insulation layer 5 is made of silica aerogel, the thickness of the heat insulation layer 5 is 35-55 microns, the silica aerogel has the characteristics of heat insulation and flame retardation, the silica aerogel has a nano-scale pore structure smaller than the average free path of air molecules, achieving a vacuum-like heat insulation effect, and has the advantages of low thermal conductivity, high flame retardation, long service life, low loss, hydrophobicity, and environmental friendliness.

[0029] The use method of the embodiment is that the heat dissipation layer 3, the flame-retardant layer 42, and the heat insulation layer 5 are sequentially wrapped from inside to outside between the explosion-proof outer shell body 1 and the lithium battery core body 2, the lithium battery has good heat dissipation, flame retardation, and heat insulation performance, the flame-retardant tape 4 is multi-layered composite of the base material layer 41, the flame-retardant layer 42, the polyester fiber layer 43, and the flame-retardant adhesive layer 44, the flame-retardant tape 4 not only has good flame retardation for the lithium battery, but also has strong adhesion of the PET material base material layer 41 with the particle structure and the flame-retardant adhesive layer 44, the flame-retardant tape 4 is firmly bonded with the heat dissipation layer 3 and the heat insulation layer 5, the polyester fiber provides the support structure strength and tensile resistance of the flame-retardant tape 4, and increases the stability of the lithium battery structure, the top cover 7 is covered on the explosion-proof outer shell body 1, the assembly table 61 at the top of the explosion-proof outer shell body 1 is inserted into the assembly pressing groove 62 of the top cover 7, the assembly table 61 is fixed with the top cover 7 through the inner bolt 64 in the assembly hole 63, the sealing compression ring 65 is arranged in the clamping groove formed between the assembly table 61 and the assembly pressing groove 62, the sealing compression ring 65 enhances the assembly sealing between the top cover 7 and the explosion-proof outer shell body 1, the sealing compression ring 65 has a stable structure in the clamping groove, and the assembly table 61 has an inclined surface structure with an inner high and an outer low, the assembly table 61 has a permeation prevention effect, and the explosion-proof outer shell body 1 and the top cover 7 are assembled in a permeation prevention and sealing manner.

[0030] Finally, it should be noted that the above only describes preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A fire-retardant lithium battery comprising an explosion-proof outer casing (1) and a lithium battery core (2), characterized in that: The interior space of the explosion-proof outer shell (1) is provided with a lithium battery core (2), the outer wrapping of the lithium battery core (2) is provided with a heat dissipation layer (3), the surface of the side of the heat dissipation layer (3) away from the lithium battery core (2) is wrapped with a flame-retardant belt (4), the flame-retardant belt (4) is provided with a plurality of layers of flame-retardant composite, the surface of the side of the flame-retardant belt (4) away from the heat dissipation layer (3) is wrapped with a heat insulation layer (5), the surface of the side of the heat insulation layer (5) away from the flame-retardant belt (4) is connected with the inner wall of the explosion-proof outer shell (1), the top of the explosion-proof outer shell (1) is provided with a top cover (7) through an assembling mechanism (6), the top of the lithium battery core (2) is provided with a positive pole (8) through a positive electrode sheet, and the upper end of the positive pole (8) is arranged on the top of the top cover (7).

2. The flame retardant lithium battery of claim 1, wherein: The flame-retardant belt (4) comprises a substrate layer (41), a flame-retardant layer (42), a polyester fiber layer (43) and a flame-retardant adhesive layer (44), one side of the substrate layer (41) is connected with the heat dissipation layer (3), the other side of the substrate layer (41) is provided with the flame-retardant layer (42), the side of the flame-retardant layer (42) away from the substrate layer (41) is provided with the polyester fiber layer (43), the side of the polyester fiber layer (43) away from the flame-retardant layer (42) is provided with the flame-retardant adhesive layer (44), and the side of the flame-retardant adhesive layer (44) away from the polyester fiber layer (43) is connected with the heat insulation layer (5).

3. The flame retardant lithium battery of claim 1, wherein: The assembling mechanism (6) comprises an assembling table (61), an assembling pressing groove (62), an assembling hole (63), an inner bolt (64) and a sealing pressing ring (65), the top of the explosion-proof outer shell (1) is provided with the assembling table (61), the edge of the bottom of the top cover (7) is provided with the assembling pressing groove (62), the top cover (7) on the top of the assembling pressing groove (62) and the assembling table (61) are provided with the assembling hole (63), the assembling table (61) is arranged in the assembling pressing groove (62) and is fixed with the top cover (7) through the inner bolt (64) in the assembling hole (63), and the sealing pressing ring (65) is arranged between the assembling table (61) and the top cover (7).

4. The flame retardant lithium battery of claim 3, wherein: The side of the assembling table (61) away from the lithium battery core (2) is provided in an inclined downward inclined surface structure, a clamping groove is formed between the assembling table (61) and the assembling pressing groove (62), and the sealing pressing ring (65) is arranged in the clamping groove.

5. The flame retardant lithium battery of claim 2, wherein: The substrate layer (41) is made of PET material, the surface of the side of the substrate layer (41) away from the flame-retardant layer (42) is provided with uniformly distributed particle structures, the thickness of the substrate layer (41) is 20-35 µm, the thickness of the flame-retardant layer (42) is 20-30 µm, the thickness of the polyester fiber layer (43) is 15-30 µm, the thickness of the flame-retardant adhesive layer (44) is 10-20 µm, and the flame-retardant adhesive layer (44) and the polyester fiber layer (43) are provided with a flame-retardant agent.

6. The flame retardant lithium battery of claim 1, wherein: The heat dissipation layer (3) is made of a heat-conducting carbon fiber layer, and the heat dissipation layer (3) is internally provided with a heat-conducting pipe in a spiral structure.

7. The flame retardant lithium battery of claim 1, wherein: The heat insulation layer (5) is made of silica aerogel, and the thickness of the heat insulation layer (5) is 35-55 µm.

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