Separation plate piece for battery

Abstract

The utility model relates to the technical field of mica isolation materials for lithium battery thermal runaway protection, in particular to an isolation plate for a battery. The isolation plate for the battery is a mica / organic silicon mica composite profile; the mica / organosilicon mica composite section bar is provided with a plurality of explosion-proof grooves which are arranged at intervals. The groove depth of the explosion-proof groove is 0.7-0.925 times of the thickness of the mica / organic silicon mica composite profile; when the power battery is in thermal runaway and generates hot air flow, the hot air flow breaks through the anti-explosion groove of the mica / organic silicon mica composite section bar, the hot air flow is released, the time of series burning and even explosion between the power batteries is delayed, and the thermal runaway protection safety performance of the power battery is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of mica insulating materials for protecting lithium batteries from thermal runaway, and in particular to an insulating plate for batteries. Background Art

[0002] Since the 21st century, with the increasing severity of resource and environmental problems, the new energy industry has developed rapidly. The "New Energy Vehicle Industry Development Plan (2021-2035)" promulgated in 2020 requires the in-depth implementation of the new energy vehicle development plan, promoting the high-quality and sustainable development of China's new energy vehicle industry, and accelerating the construction of an automobile power. From 2020 to date, the proportion of new energy vehicles in the overall automobile market share has increased year by year. New energy vehicles and traditional oil vehicles have become one of the important components of the automobile market. As a conventional means of transportation for the public, the driving safety performance of new energy vehicles has been questioned by consumers. The main reason is that major driving safety issues caused by new energy vehicle battery accidents have been reported from time to time, stimulating consumers' sensitive nerves about driving safety issues. Based on personal safety considerations, some consumers would rather purchase traditional oil vehicles than choose emerging new energy vehicles. Solving the thermal runaway protection safety performance of new energy vehicle battery modules is an important problem facing the current development of new energy vehicles.

[0003] The thermal runaway protection safety performance coefficient of the battery module of new energy vehicles is directly related to the structural design of the battery module. Chinese patent CN206834265U discloses a power lithium battery pack, including: a positive battery box, a negative battery box, a plurality of parallel cylindrical battery cells, a battery cell thermal isolation device, a positive electrode welding conductive sheet, a negative electrode welding conductive sheet, a pressure relief isolation plate, a high temperature resistant insulating sheet and an isolation plate, wherein the cylindrical battery cell and the battery cell thermal isolation device are arranged between the positive battery box and the negative battery box, and the cylindrical battery cell is fixed in the battery cell thermal isolation device; the pressure relief isolation plate and the positive electrode welding conductive sheet are arranged on the positive battery box, and the negative electrode welding conductive sheet, the high temperature resistant insulating sheet and the isolation plate are arranged on the negative battery box. Among them, the pressure relief isolation plate is assembled close to the positive parallel busbar, the high temperature resistant insulating sheet is assembled close to the negative parallel busbar, and the isolation plate is assembled close to the high temperature resistant insulating sheet.

[0004] The existing power lithium battery pack structure plays a role of safety isolation with high temperature resistant insulation sheets and isolation plates with pressure relief holes. However, the isolation system formed by high temperature resistant insulation sheets and isolation plates is not conducive to the lightweight design of power lithium battery packs due to the large volume and mass of the two stacked together. On the other hand, compared with the single-piece insulation board, the assembly and production of high temperature resistant insulation sheets and isolation plates requires relatively more assembly time and higher assembly cost, which is not conducive to reducing the overall production cost of power lithium battery packs. Utility Model Content

[0005] In order to solve the problems existing in the above-mentioned prior art, the present application provides an isolation plate for a battery.

[0006] The present application provides a battery isolation plate, which is realized by the following technical solutions:

[0007] A battery isolation plate is a mica / silicone mica composite profile; the mica / silicone mica composite profile is provided with a plurality of explosion-proof grooves spaced apart from each other; the groove depth of the explosion-proof groove is equal to 0.7-0.925 times the thickness of the mica / silicone mica composite profile; when the power battery thermal runaway generates hot air flow, the hot air flow breaks through the explosion-proof groove of the mica / silicone mica composite profile, releases the hot air flow, delays the time for series burning or even explosion between power batteries, and effectively improves the thermal runaway protection safety performance of the power battery pack.

[0008] Preferably, the mica / organosilicon mica composite profile comprises mica / organosilicon mica paper and mica / organosilicon composite mica board, and the mica / organosilicon composite mica board is punched and cut or integrally formed with explosion-proof holes; the mica / organosilicon mica paper and the mica / organosilicon composite mica board are hot-pressed and composited to form a mica / organosilicon mica composite profile, and the explosion-proof hole is the explosion-proof groove of the mica / organosilicon mica composite profile.

[0009] Preferably, the mica / organosilicon mica paper is formed by hot pressing one to four mica papers; the thickness of a single mica paper is 0.075-0.080 mm; the thickness of the mica / organosilicon mica paper is 0.075-0.30 mm; the thickness of the mica / organosilicon mica composite profile is 0.80-1.02 mm.

[0010] Preferably, the thickness of the mica / organosilicon mica paper is 0.075-0.08 mm, and the thickness of the mica / organosilicon mica composite profile is 0.98-1.02 mm.

[0011] The processing technology of the mica / organic silicon mica composite profile prepared by adopting the above technical solution is relatively simple, which is conducive to ensuring the flame retardant and fireproof properties and electrical breakdown resistance and insulation properties of the mica / organic silicon mica composite profile while reducing its production cost.

[0012] Preferably, the mica / organosilicon composite mica board is formed by hot pressing nine to twelve sheets of mica paper to form a standard mica board, and the standard mica board is punched and cut to form explosion-proof holes; the thickness of a single mica paper is 0.075-0.080mm; the thickness of the mica / organosilicon composite mica board is 0.700-0.925mm; or the mica / organosilicon composite mica board is integrally cast and hot-pressed with a special-shaped mica slurry suitable for three-dimensional modeling; the mica / organosilicon composite mica board is integrally cast and hot-pressed with explosion-proof holes; the special-shaped mica slurry suitable for three-dimensional modeling is self-made by Zhejiang Rongtai Electrical Equipment Co., Ltd.

[0013] By adopting the special-shaped mica slurry suitable for three-dimensional modeling developed by the applicant in 21 years, and using the special-shaped mica slurry suitable for three-dimensional modeling to integrally cast and hot-press mica / silicone composite mica boards through existing preparation technology, the mica / silicone composite mica boards can be given excellent insulation, heat resistance, bending strength and mechanical properties, that is, the existing technology can be used to produce high-quality mica / silicone composite mica boards, achieving the above-mentioned excellent results while helping to improve the overall service life and stability of use, thereby improving the thermal runaway protection safety performance of the power battery pack.

[0014] Preferably, the mica / organosilicon mica composite profile comprises a mica / organosilicon mica shaped plate and a plurality of mica / organosilicon mica unit pieces; a pressure relief guide groove is punched or cut or integrally formed on one surface of the mica / organosilicon mica shaped plate; a countersunk hole groove connected to the pressure relief guide groove is punched or cut or integrally formed on the other surface of the mica / organosilicon mica shaped plate; a single mica / organosilicon mica unit piece is hot-pressed or adhesively fixed to the countersunk hole groove, and the pressure relief guide groove and part of the countersunk hole groove form an explosion-proof groove; the surface of the mica / organosilicon mica unit piece is flush with the surface of the mica / organosilicon mica shaped plate.

[0015] Preferably, the mica / organosilicon mica unit sheet is formed by hot pressing and cutting one to four mica papers; the thickness of a single mica paper is 0.075-0.080 mm; and the thickness of the mica / organosilicon mica shaped plate is 0.80-1.1 mm.

[0016] The mica / silicone mica composite profile prepared by adopting the above technical solution is more sensitive to the feedback of the hot air flow generated by thermal runaway of the power battery, that is, the hot air flow generated by thermal runaway of the power battery is more likely to break through the mica / silicone mica unit sheets hot-pressed or glued by the mica / silicone mica composite profile, thereby further improving the thermal runaway protection safety performance of the power battery pack.

[0017] Preferably, a single mica / silicone mica unit sheet is fixedly connected to the countersunk groove of the mica / silicone mica special-shaped plate by hot-melt adhesive. When the power battery thermally runs away and generates hot air flow, the hot-melt adhesive bonding the mica / silicone mica unit sheet becomes more fluid after being heated, which can make it easier for the hot air flow to break through the mica / silicone mica unit sheet and flush it out of the countersunk groove, thereby releasing the hot air flow and delaying the occurrence of burning or even explosion between the power batteries.

[0018] Preferably, the hot melt adhesive used for bonding the mica / organosilicon mica unit sheets and the mica / organosilicon mica special-shaped plates is at least one of commercially available TPU hot melt adhesive, EVA hot melt adhesive, TPR hot melt adhesive, and PEA hot melt adhesive.

[0019] Preferably, the mica / organosilicon mica shaped plate is formed by hot pressing twelve to fourteen sheets of mica paper to form a standard mica sheet, and the thickness of a single mica paper is 0.075-0.080 mm; the standard mica sheet is punched and cut to form a pressure relief guide groove and a countersunk hole groove; or the mica / organosilicon mica shaped plate adopts a three-dimensional shaped mica slurry to be integrally cast and hot-pressed to form a pressure relief guide groove and a countersunk hole groove; the shaped mica slurry suitable for three-dimensional shaping is self-made by Zhejiang Rongtai Electrical Equipment Co., Ltd.

[0020] By adopting the special-shaped mica slurry suitable for three-dimensional modeling developed by the applicant in 21 years, the mica / silicone mica special-shaped plate obtained by using the special-shaped mica slurry suitable for three-dimensional modeling through the existing preparation technology not only has a high yield rate, which can reduce the overall production cost and facilitate market sales and popularization, but also can give the mica / silicone mica special-shaped plate excellent overall insulation, heat resistance, bending strength and mechanical properties. While achieving the above-mentioned excellent effects, it is beneficial to improve the overall service life and stability of use, thereby improving the thermal runaway protection safety performance of the power battery pack.

[0021] Preferably, a plastic protective film with a flame retardant grade of V-0 is fixedly connected to the surface of the mica / silicone mica composite profile; the plastic protective film is coated on the edges of the mica / silicone mica composite profile; the plastic protective film fixedly connected on the surface of the mica / silicone mica composite profile facing away from the explosion-proof groove is fixedly connected to the edge side of the surface of the mica / silicone mica composite profile facing away from the explosion-proof groove; the plastic protective film gives the mica / silicone mica composite profile good wear resistance and assembly and processing safety, and the plastic protective film can prevent the mica on the surface of the mica / silicone mica composite profile from peeling off and entering the battery cell of the power lithium battery pack due to assembly clamping friction, thereby further improving the overall thermal runaway protection safety performance of the power battery pack.

[0022] Preferably, the plastic protective film is a PI film or a PPS film with a flame retardant grade of V-0.

[0023] In summary, this application has the following advantages:

[0024] 1. When the power battery thermally runs away and generates hot air flow, the hot air flow breaks through the explosion-proof groove of the mica / silicone mica composite profile in this application. The release of the hot air flow breaking through the explosion-proof groove will not only produce a certain warning sound to remind the driver, but also delay the time for the power batteries to burn or even explode, effectively improving the thermal runaway protection safety performance of the power battery pack. Compared with the prior art, the mica / silicone mica composite profile in this application has good insulation, heat resistance, bending strength, and mechanical properties. At the same time, the single-piece combination design structure is conducive to assembly production, reducing labor costs and lightweight design of power battery packs.

[0025] 2. In this application, the applicant independently developed a special-shaped mica slurry suitable for three-dimensional modeling in 21 years, and used it to prepare a mica / silicone composite mica board, which can give the mica / silicone composite mica board excellent insulation, heat resistance, bending strength, and mechanical properties, which is beneficial to improve the overall service life and stability of use, thereby improving the thermal runaway protection safety performance of the power battery pack.

[0026] 3. In this application, the applicant independently developed a special-shaped mica slurry suitable for three-dimensional modeling in 21 years. The mica / silicone mica special-shaped plate prepared by the current preparation process not only has a high yield rate, but also can give the mica / silicone mica special-shaped plate excellent insulation, heat resistance, bending strength and mechanical properties. The above-mentioned excellent effects are achieved while helping to improve the overall service life and stability of use, thereby improving the thermal runaway protection safety performance of the power battery pack.

[0027] 4. In the present application, a plastic protective film with a flame retardant grade of V-0 is used to modify the surface of the mica / organosilicon mica composite profile, which can prevent the mica on the surface of the mica / organosilicon mica composite profile from peeling off and entering the battery cells of the power lithium battery pack due to assembly clamping friction, thereby further improving the overall thermal runaway protection safety performance of the power battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the isolation plate for the battery in Example 1 of the present application.

[0029] Figure 2 It is a schematic diagram of the structure of the isolation plate for the battery in Example 3 of the present application.

[0030] Figure 3It is a schematic diagram of the structure of the isolation plate for the battery in Example 5 of the present application.

[0031] Figure 4 It is a schematic diagram of the structure of the isolation plate for the battery in Example 6 of the present application.

[0032] Figure 5 It is a schematic diagram of the structure of the isolation plate for the battery in Example 7 of the present application.

[0033] In the figure, 1. mica / silicone mica composite profile; 10. explosion-proof groove; 11. mica / silicone mica paper; 110. mica paper; 12. mica / silicone composite mica board; 120. explosion-proof hole; 13. mica / silicone mica special-shaped board; 131. pressure relief guide groove; 132. countersunk groove; 14. mica / silicone mica unit sheet; 2. plastic protective film. DETAILED DESCRIPTION

[0034] The present application is further described in detail below with reference to the accompanying drawings and embodiments. Example

[0035] Example 1: Reference Figure 1 , a battery isolation plate is a mica / silicone mica composite profile 1. The mica / silicone mica composite profile 1 is provided with a plurality of explosion-proof grooves 10 spaced apart from each other. The depth of the explosion-proof groove 10 is equal to 0.7-0.925 times the thickness of the mica / silicone mica composite profile 1. When the power battery thermal runaway generates hot air flow, the hot air flow breaks through the explosion-proof groove 10 of the mica / silicone mica composite profile 1. The release of the hot air flow breaking through the explosion-proof groove will not only produce a certain warning sound to remind the driver, but also delay the time for the power batteries to burn or even explode, effectively improving the thermal runaway protection safety performance of the power battery pack.

[0036] Reference Figure 1 The mica / organosilicon mica composite profile 1 includes a mica / organosilicon mica paper 11 and a mica / organosilicon composite mica board 12, that is, the mica / organosilicon mica paper 11 and the mica / organosilicon composite mica board 12 are hot-pressed and composited to form the mica / organosilicon mica composite profile 1. The thickness of the mica / organosilicon composite mica board 12 is equal to 0.700-0.925 times the thickness of the mica / organosilicon mica composite profile 1.

[0037] Reference Figure 1The mica / organosilicon mica paper 11 is formed by hot pressing one to four mica papers 110. The thickness of a single mica paper 110 is 0.075-0.080 mm, specifically P506 phlogopite mica paper. The thickness of the mica / organosilicon mica paper 11 is 0.075-0.30 mm. The thickness of the mica / organosilicon mica composite profile 1 is 0.80-1.0 mm. Preferably, the thickness of the mica / organosilicon mica composite profile 1 is 0.98-1.02 mm.

[0038] Preferably, the thickness of the mica / organosilicon mica paper 11 is 0.28-0.30 mm, the thickness of the mica / organosilicon composite mica board 12 is 0.70-0.72 mm, and the thickness of the mica / organosilicon mica composite profile 1 is 1.00±0.02 mm.

[0039] Preferably, the thickness of the mica / organosilicon mica paper 11 is 0.21-0.23 mm, the thickness of the mica / organosilicon composite mica board 12 is 0.77-0.79 mm, and the thickness of the mica / organosilicon mica composite profile 1 is 1.00±0.02 mm.

[0040] Preferably, the thickness of the mica / organosilicon mica paper 11 is 0.145-0.16 mm, the thickness of the mica / organosilicon composite mica board 12 is 0.840-0.855 mm, and the thickness of the mica / organosilicon mica composite profile 1 is 1.00±0.02 mm.

[0041] Preferably, the thickness of the mica / organosilicon mica paper 11 is 0.075-0.08 mm, the thickness of the mica / organosilicon composite mica board 12 is 0.92-0.925 mm, and the thickness of the mica / organosilicon mica composite profile 1 is 1.00±0.02 mm.

[0042] In this embodiment, the mica / organic silicon mica paper 11 is formed by hot pressing two mica papers 110, and its thickness is 0.145-0.16 mm. The thickness of the mica / organic silicon composite mica board 12 is 0.840-0.855 mm.

[0043] Reference Figure 1 The mica / organosilicon composite mica board 12 is punched, cut or integrally formed with an explosion-proof hole 120. The explosion-proof hole 120 of the mica / organosilicon composite mica board 12 is the explosion-proof groove 10 of the mica / organosilicon mica composite profile 1.

[0044] Reference Figure 1When the mica / organosilicon composite mica board 12 is punched and cut to form the explosion-proof hole 120, the mica / organosilicon composite mica board 12 is formed by hot pressing nine to twelve mica papers 110 to form a standard mica board. The standard mica board is formed with the explosion-proof hole 120 by punching and cutting, and the thickness of the mica / organosilicon composite mica board 12 is 0.700-0.925mm. In this embodiment, the mica / organosilicon composite mica board 12 is formed by hot pressing eleven mica papers 110, and its thickness is 0.840-0.855mm.

[0045] Reference Figure 1 The mica paper 110 in the mica / organic silicon mica paper 11 and the mica / organic silicon composite mica board 12 can be selected from commercially available phlogopite mica, mixed mica paper, or composite mica paper. In this embodiment, the P506 phlogopite mica paper made by Zhejiang Rongtai Electrical Equipment Co., Ltd. is used.

[0046] Reference Figure 1 When the mica / organic silicon composite mica board 12 is integrally formed with the explosion-proof hole 120, the mica / organic silicon composite mica board 12 is integrally cast and hot-pressed with a special-shaped mica slurry suitable for three-dimensional modeling and is formed with the explosion-proof hole 120. The special-shaped mica slurry suitable for three-dimensional modeling is made by Zhejiang Rongtai Electrical Equipment Co., Ltd.

[0047] For special-shaped mica slurry suitable for three-dimensional modeling, see application number: CN202111467697X. Patent name: A special-shaped mica insulation product suitable for three-dimensional modeling and its preparation method. Specifically, the special-shaped mica slurry suitable for three-dimensional modeling is a mixture of the silicone resin and mica slurry in CN202111467697X, wherein the mica slurry is composed of the following materials: 650g of muscovite, 80g of biotite, 150g of fluorphlogopite, 20g of A-1120 silane coupling agent, 19.8g of γ-alumina fiber, and 0.2g of silicon carbide whiskers. The silicone resin is prepared from 18g of FM-7721 modified hydroxysiloxane, 49.6g of methanol, 32g of KR-242A silicone resin and 0.2g of diethylenetriamine.

[0048] The method for preparing the mica / organic silicon composite mica plate 12 comprises the following steps:

[0049] S1, respectively subjecting muscovite, biotite and fluorphlogopite to ball milling treatment, adding muscovite, biotite and fluorphlogopite to a planetary ball mill, ball milling at 50 rpm for 30 min, and sieving with 250 mesh and 600 mesh sieves to obtain muscovite, biotite and fluorphlogopite with a particle size between 20 and 60 microns, weighing 650 g of muscovite, 80 g of biotite and 150 g of fluorphlogopite, placing them in a high-speed dispersing kettle, and mixing them at 120 rpm for 5 min to obtain mica powder;

[0050] S2, A-1120 silane coupling agent and deionized water are prepared into 4L surface treatment agent liquid at a ratio of 1:200, the mica powder in S1 is placed in the 4L surface treatment agent liquid, and ultrasonic treatment is performed for 12 minutes at a stirring speed of 120rpm, the ultrasonic frequency is 32KHz, and the power is 200W. After the ultrasonic treatment is completed, the powder is filtered and the obtained powder is low-temperature dried at 100°C to obtain modified mica powder;

[0051] S3, add 19.4g of γ-alumina fiber, 0.6g of silicon carbide whisker and 900g of methanol to the modified mica powder obtained in S2, mix the mica slurry at 100rpm for 5min, add 135g of the finished silicone resin and stir at 200rpm for 5min to obtain mica insulation product slurry; wherein, the preparation method of the silicone resin is as follows: add 0.05g of diethylenetriamine, 18g of FM-7721 modified hydroxysiloxane and 32g of methylphenyl silicone resin to a reactor, pre-react at 65°C for 120s, cool to 4°C, add 49.6g of methanol, stir at 80rpm for 10min, add 0.15g of diethylenetriamine, stir at 60rpm for 2min to obtain a finished silicone resin;

[0052] S4, injecting the mica insulation product slurry in S3 into a mold, heating the mold to 75° C., and drying the mold for 60 minutes to remove the methanol solvent in the mica insulation product slurry;

[0053] S5, adopting a four-step hot pressing method to prepare a semi-finished mica / silicone composite mica board, the four-step hot pressing method is: in the first step of hot pressing, the hot pressing conditions are a platen temperature of 80°C, a pressure of 0.25 MPa, a duration of 60 seconds, and a degassing of 2 seconds; in the second step of hot pressing, the hot pressing conditions are a platen temperature of 135°C, a pressure of 0.5 MPa, a duration of 100 seconds, and a degassing of 2 seconds; in the third step of hot pressing, the hot pressing conditions are a platen temperature of 180°C, a pressure of 0.8 MPa, and a duration of 150 seconds; in the fourth step of hot pressing, the hot pressing conditions are a platen temperature of 120°C, a pressure of 0.5 MPa, and a duration of 60 seconds, to obtain a semi-finished mica insulation product;

[0054] S6, heating the semi-finished mica insulation product to 90°C at a heating rate of 1.5°C / min, maintaining the temperature for 90 minutes, and naturally cooling to room temperature to obtain a mica / organic silicon composite mica board.

[0055] In this application, by adopting the special-shaped mica slurry suitable for three-dimensional modeling developed by the applicant in 21 years, the special-shaped mica slurry suitable for three-dimensional modeling is used to obtain a mica / silicone composite mica board through the existing preparation technology, which can give the mica / silicone composite mica board excellent insulation, heat resistance, bending strength and mechanical properties, which is beneficial to improve the overall service life and stability of use, thereby improving the thermal runaway protection safety performance of the power battery pack.

[0056] Compared with the prior art, the mica / silicone mica composite profile in the present application has good insulation, heat resistance, bending strength, and mechanical properties. At the same time, the single-piece combination design structure is conducive to assembly production, reducing labor costs and lightweight design of power battery packs. It is applied to the production of battery isolation panels in the present application and has achieved excellent technical progress.

[0057] The difference between Example 2 and Example 1 is that in Example 2, the mica / organosilicon mica paper 11 is formed by hot pressing a single mica paper 110, that is, the thickness of the mica / organosilicon mica paper 11 is 0.075-0.08 mm. In this example, the mica / organosilicon composite mica board 12 is formed by hot pressing twelve mica papers 110, and the thickness of the mica / organosilicon composite mica board 12 is 0.92-0.925 mm.

[0058] The difference between Example 3 and Example 1 is that: Figure 2 The mica / organosilicon mica composite profile 1 includes a mica / organosilicon mica shaped plate 13 and a plurality of mica / organosilicon mica unit sheets 14. A pressure relief guide groove 131 is formed by punching and cutting on one surface of the mica / organosilicon mica shaped plate 13, and a counterbore groove 132 connected to the pressure relief guide groove 131 is formed by punching and cutting on the other surface of the mica / organosilicon mica shaped plate 13.

[0059] refer to Figure 2 The mica / organosilicon mica shaped plate 13 is formed by hot pressing twelve to fourteen mica papers 110 to form a standard mica plate, and the thickness of a single mica paper 110 is 0.075-0.080 mm. The standard mica plate is punched and cut to form the pressure relief guide groove 131 and the countersunk hole groove 132. In this embodiment 3, the mica / organosilicon mica shaped plate 13 is formed by hot pressing thirteen mica papers 110 to form a standard mica plate, that is, the thickness of the mica / organosilicon mica shaped plate 13 is 0.98-1.02 mm.

[0060] refer to Figure 2, a single mica / organosilicon mica unit piece 14 is hot-pressed and fixedly connected to the countersunk groove 132 of the mica / organosilicon mica shaped plate 13. After the mica / organosilicon mica shaped plate 13 and the mica / organosilicon mica unit piece 14 are hot-pressed and connected, the surface of the mica / organosilicon mica unit piece 14 is flush with the surface of the mica / organosilicon mica shaped plate 13, and the pressure relief guide groove 131 and part of the countersunk groove 132 form an explosion-proof groove 10.

[0061] refer to Figure 2 The mica / organosilicon mica unit sheet 14 is formed by hot pressing and cutting one to four mica papers 110. The thickness of a single mica paper 110 is 0.075-0.080 mm. The thickness of the mica / organosilicon mica special-shaped plate 13 is 0.80-1.1 mm.

[0062] Preferably, the mica / organic silicon mica unit sheet 14 is formed by hot pressing and cutting four mica papers 110 .

[0063] Preferably, the mica / organic silicon mica unit sheet 14 is formed by hot pressing and cutting three mica papers 110 .

[0064] Preferably, the mica / organic silicon mica unit sheet 14 is formed by hot pressing and cutting two mica papers 110 .

[0065] In this embodiment, the thickness of the mica / organic silicon mica unit sheet 14 is 0.075-0.080 mm, that is, it is formed by cutting a single mica paper 110 .

[0066] The difference between Example 4 and Example 3 is that: a pressure relief guide groove 131 is integrally formed on one surface of the mica / organic silicon mica shaped plate 13, and a countersunk hole groove 132 connected to the pressure relief guide groove 131 is integrally formed on the other surface of the mica / organic silicon mica shaped plate 13. That is, the mica / organic silicon mica shaped plate 13 is integrally cast and hot-pressed with a three-dimensional shaped mica slurry to form the pressure relief guide groove 131 and the countersunk hole groove 132. The shaped mica slurry suitable for three-dimensional shaping (the same as the shaped mica slurry suitable for three-dimensional shaping in Example 1) is self-made by Zhejiang Rongtai Electrical Equipment Co., Ltd.

[0067] In this application, the applicant independently developed a special-shaped mica slurry suitable for three-dimensional modeling in 21 years. The mica / silicone mica special-shaped plate obtained by using the special-shaped mica slurry suitable for three-dimensional modeling through the existing preparation process not only has a high yield rate, can reduce the overall production cost, and is easy to popularize and promote to the market, but also can give the mica / silicone mica special-shaped plate excellent insulation, heat resistance, bending strength, and mechanical properties, which is beneficial to improve the overall service life and stability of use, thereby improving the thermal runaway protection safety performance of the power battery pack.

[0068] Compared with the prior art, the mica / silicone mica composite profile in the present application has good insulation, heat resistance, bending strength, and mechanical properties. At the same time, the single-piece combination design structure is conducive to assembly production, reducing labor costs and lightweight design of power battery packs.

[0069] The difference between Example 5 and Example 3 is that: Figure 3 The single mica / organic silicon mica unit piece 14 is fixedly connected to the countersunk groove 132 of the mica / organic silicon mica shaped plate 13 by hot melt adhesive bonding. The hot melt adhesive used for bonding the mica / organic silicon mica unit piece and the mica / organic silicon mica shaped plate is one of the commercially available TPU hot melt adhesive, EVA hot melt adhesive, TPR hot melt adhesive, and PEA hot melt adhesive. In this embodiment 5, TPU hot melt adhesive (Lubrizol TPU UB310, USA) is preferably used.

[0070] When the power battery generates thermal runaway and generates hot air flow, the hot melt adhesive bonding the mica / organosilicon mica unit sheet 14 becomes more fluid after being heated, which can make it easier for the hot air flow to break through the mica / organosilicon mica unit sheet 14 and rush out of the countersunk groove 132. When the power battery generates thermal runaway and generates hot air flow, the hot air flow breaks through the explosion-proof groove 10 of the mica / organosilicon mica composite profile 1. The release of the hot air flow breaking through the explosion-proof groove will not only produce a certain warning sound to remind the driver, but also delay the time for the power batteries to burn or even explode, thereby effectively improving the thermal runaway protection safety performance of the power battery pack.

[0071] The difference between Example 6 and Example 1 is: Figure 4 The surface of the mica / organic silicon mica composite profile 1 is fixedly connected with a plastic protective film 2 with a flame retardant grade of V-0 through organic silicone gel. The plastic protective film 2 is coated on the edges of the mica / organic silicon mica composite profile 1 and fixedly connected to the surface of the mica / organic silicon mica composite profile 1 facing away from the explosion-proof groove 10. The plastic protective film 2 is fixedly connected to the edge side of the surface of the mica / organic silicon mica composite profile 1 facing away from the explosion-proof groove 10.

[0072] The organic silica gel water can be selected from commercially available high temperature resistant organic silica gel water or organic silica gel water prepared by the applicant. The organic silica gel water prepared by the applicant is the organic silicone resin in CN202111467697X, which is prepared from 18g of FM-7721 modified hydroxy siloxane, 49.6g of methanol, 32g of KR-242A organic silicone resin and 0.2g of diethylenetriamine.

[0073] The plastic protective film is a PI film or PPS film with a flame retardant grade of V-0. In this application, the plastic protective film preferably used is a PI film with a flame retardant grade of V-0, specifically a PI halogen-free flame retardant high-temperature insulating film with a thickness of 0.10 mm, which is customized by Shijiazhuang Dajia New Material Technology Co., Ltd.).

[0074] The PI protective film gives the mica / silicone mica composite profile 1 good wear resistance and assembly processing safety. The PI protective film can prevent the mica on the surface of the mica / silicone mica composite profile 1 from peeling off and entering the battery cell of the power lithium battery pack due to assembly clamping friction, further improving the overall thermal runaway protection safety performance of the power battery pack.

[0075] The difference between Example 7 and Example 5 is that: Figure 5 The surface of the mica / organic silicon mica shaped plate 13 is fixedly connected with a flame retardant grade V-0 plastic protective film 2 through organic silicone water. One surface of the mica / organic silicon mica unit sheet 14 is fixedly connected with a flame retardant grade V-0 plastic protective film 2 through organic silicone water.

[0076] The mica / silicone mica composite profile 1 is fixedly connected to a plastic protective film 2 with a flame retardant grade of V-0 on the surface through organic silicone water. The organic silicone water can be selected as a commercially available high-temperature resistant organic silicone water or an organic silicone water made by the applicant. The organic silicone water made by the applicant is the silicone resin in CN202111467697X, which is prepared from 18g of FM-7721 modified hydroxysiloxane, 49.6g of methanol, 32g of KR-242A silicone resin and 0.2g of diethylenetriamine. The plastic protective film is a PI film or PPS film with a flame retardant grade of V-0. The plastic protective film used in this application is a PI film with a flame retardant grade of V-0 (0.10mm PI halogen-free flame retardant high-temperature insulating film, Shijiazhuang Dajia New Materials Technology Co., Ltd.).

[0077] The PI protective film gives the mica / silicone mica composite profile 1 good wear resistance and assembly processing safety. The PI protective film can prevent the mica on the surface of the mica / silicone mica composite profile 1 from peeling off and entering the battery cell of the power lithium battery pack due to assembly clamping friction, further improving the overall thermal runaway protection safety performance of the power battery pack.

[0078] The P506 phlogopite paper made by Zhejiang Rongtai Electrical Equipment Co., Ltd. in Example 1 was hot-pressed to form mica / organosilicon mica paper 11 and mica / organosilicon composite mica board 12, and then the mica / organosilicon mica composite profile formed by hot-pressing the mica / organosilicon mica paper 11 and the mica / organosilicon composite mica board 12 was experimental group 1. The mica / organosilicon mica composite profile made by Zhejiang Rongtai Electrical Equipment Co., Ltd. in Example 1, which was suitable for three-dimensional modeling, was cast and hot-pressed with a special-shaped mica slurry integrally, was experimental group 2. Experimental group 3 was a mica / organosilicon mica composite profile formed by hot-pressing the commercially available P506 phlogopite mica paper (Shanghai Wangxu Electric Co., Ltd.) to form mica / organosilicon mica paper 11 and mica / organosilicon composite mica board 12, and then the mica / organosilicon mica paper 11 and the mica / organosilicon composite mica board 12 were hot-pressed to form a mica / organosilicon mica composite profile.

[0079] The experimental groups 1-3 were subjected to density test (GB / T 5019.2-2009 Test Methods for Mica Products, Article 6 "Density"), electrical strength test (GB / T 5019.2-2009 Test Methods for Mica Products, Article 22 "Electrical Strength") and flexural strength test (GB / T 5019.2-2009 Test Methods for Mica Products, Article 11 "Flexural Strength and Flexural Elastic Modulus", sample width 1.0 mm, test span 16 mm, test speed 50 mm / min, indenter radius 5 mm). The density of the mica / organic silicon mica composite profile in Example 1 is 2.15 / cm 3 , electrical strength 35.4kv / mm, flexural strength 1.05MPa; the density of the mica / organic silicon mica composite profile in Example 2 is 2.09g / cm 3 , electrical strength 41.5 kv / mm, bending strength 1.21 MPa. The density of the mica / organic silicon mica composite profile in Example 3 is 2.11 / cm 3 , electrical strength 33.6kv / mm, bending strength 0.97MPa. In summary, the P506 phlogopite paper made by Zhejiang Rongtai Electrical Equipment Co., Ltd. in Example 1 is used to form mica / organosilicon mica paper 11 and mica / organosilicon composite mica board 12 by hot pressing, and then the mica / organosilicon mica composite profile formed by hot pressing the mica / organosilicon mica paper 11 and the mica / organosilicon composite mica board 12 has relatively good performance and is convenient for industrial mass production. For customers who require higher mechanical properties and safety protection performance of mica / organosilicon mica composite profiles, the mica / organosilicon mica composite profiles made by Zhejiang Rongtai Electrical Equipment Co., Ltd., which are suitable for three-dimensional modeling, are selected.

[0080] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery isolation plate, Features: The battery isolation plate is a mica / organosilicon mica composite profile (1); the mica / organosilicon mica composite profile (1) is provided with a plurality of explosion-proof grooves (10) spaced apart from each other; the groove depth of the explosion-proof grooves (10) is equal to 0.7-0.925 times the thickness of the mica / organosilicon mica composite profile (1).

2. A battery isolation plate according to claim 1, Features: The mica / organosilicon mica composite profile (1) comprises mica / organosilicon mica paper (11) and a mica / organosilicon composite mica plate (12); the mica / organosilicon composite mica plate (12) is punched, cut or integrally formed with an explosion-proof hole (120); the mica / organosilicon mica paper (11) and the mica / organosilicon composite mica plate (12) are hot-pressed and composited to form the mica / organosilicon mica composite profile (1); the explosion-proof hole (120) is the explosion-proof groove (10) of the mica / organosilicon mica composite profile (1).

3. A battery isolation plate according to claim 2, Features: The mica / organosilicon mica paper (11) is formed by hot pressing one to four sheets of mica paper (110); the thickness of a single sheet of mica paper (110) is 0.075-0.080 mm; the thickness of the mica / organosilicon mica paper (11) is 0.075-0.30 mm; and the thickness of the mica / organosilicon mica composite profile (1) is 0.80-1.02 mm.

4. A battery isolation plate according to claim 3, Features: The thickness of the mica / organosilicon mica paper (11) is 0.075-0.08 mm, and the thickness of the mica / organosilicon mica composite profile (1) is 0.98-1.02 mm.

5. A battery isolation plate according to claim 3, Features: The mica / organosilicon composite mica board (12) is formed by hot pressing nine to twelve mica papers (110) to form a standard mica board, and the standard mica board is punched and cut to form the explosion-proof hole (120); the thickness of a single mica paper (110) is 0.075-0.080 mm; the thickness of the mica / organosilicon composite mica board (12) is 0.700-0.925 mm; or the mica / organosilicon composite mica board (12) is integrally cast and hot-pressed with a special-shaped mica slurry suitable for three-dimensional modeling; the mica / organosilicon composite mica board (12) is integrally cast and hot-pressed to form the explosion-proof hole (120).

6. A battery separator according to claim 1, Features: The mica / organosilicon mica composite profile (1) comprises a mica / organosilicon mica shaped plate (13) and a plurality of mica / organosilicon mica unit sheets (14); a pressure relief guide groove (131) is punched, cut or integrally formed on one surface of the mica / organosilicon mica shaped plate (13); a countersunk hole groove (132) communicating with the pressure relief guide groove (131) is punched, cut or integrally formed on another surface of the mica / organosilicon mica shaped plate (13); a single mica / organosilicon mica unit sheet (14) is fixedly connected to the countersunk hole groove (132) by hot pressing or adhesive bonding, and the pressure relief guide groove (131) and a portion of the countersunk hole groove (132) form an explosion-proof groove (10); and a surface of the mica / organosilicon mica unit sheet (14) is flush with a surface of the mica / organosilicon mica shaped plate (13).

7. A battery separator according to claim 6, Features: The mica / organosilicon mica unit sheet (14) is formed by hot pressing and cutting one to four mica papers (110); the thickness of a single mica paper (110) is 0.075-0.080 mm; and the thickness of the mica / organosilicon mica special-shaped plate (13) is 0.80-1.10 mm.

8. A battery separator according to claim 6, Features: The single mica / organosilicon mica unit sheet (14) is fixedly connected to the countersunk groove (132) of the mica / organosilicon mica special-shaped plate (13) by hot-melt adhesive bonding.

9. A battery separator according to claim 6, Features: The mica / organosilicon mica shaped plate (13) is formed by hot pressing twelve to fourteen sheets of mica paper (110) to form a standard mica plate, wherein the thickness of a single sheet of mica paper (110) is 0.075-0.080 mm; the standard mica plate is punched and cut to form a pressure relief guide groove (131) and a countersunk hole groove (132); or the mica / organosilicon mica shaped plate (13) is formed by integrally casting and hot pressing a three-dimensional shaped mica slurry to form a pressure relief guide groove (131) and a countersunk hole groove (132).

10. A battery separator according to claim 1, Features: A plastic protective film (2) with a flame retardant grade of V-0 is fixedly connected to the surface of the mica / organic silicon mica composite profile (1); the plastic protective film (2) is coated on the edges of the mica / organic silicon mica composite profile (1); and the plastic protective film (2) fixedly connected to the surface of the mica / organic silicon mica composite profile (1) facing away from the explosion-proof groove (10) is fixedly connected to the edge side of the surface of the mica / organic silicon mica composite profile (1) facing away from the explosion-proof groove (10).

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