A kind of foamed silica gel heat insulation pad for power battery module
Patent Information
- Application Number
- CN202522402926.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-12
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-12
AI Technical Summary
[0003]然而，由于新能源汽车续航里程及安全性要求的不断提高，对隔热垫的隔热性能、厚度等要求不断提高，现有隔热垫仅通过单一的阻燃隔热层无法有效对热量进行阻隔、局限性大，影响热失控扩展的抑制效果
1、本实用新型通过“第一隔热层-反射层-第二隔热层”三明治结构，在两片玻璃纤维增强气凝胶之间插入镀铝PI膜/铝箔反射层，热失控时可将单体喷射出的高温辐射热立即反射回去，同时气凝胶层对传导热进行阻隔，实现了“辐射-传导”双路径同步抑制，显著延长了相邻单体达到热失控触发温度的时间。
Smart Images
Figure CN224908138U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of new energy vehicle technology, specifically a foamed silicone heat insulation pad for power battery modules. Background Technology
[0002] New energy vehicle power battery systems are first composed of multiple battery cells connected in series or parallel to form modules, which are then combined into battery packs. In actual mechanical safety accidents such as collisions, one battery cell may experience thermal runaway under extreme conditions, which can then spread to surrounding cells and even extend to the entire battery pack. Therefore, preventing the spread of thermal runaway within the battery pack can effectively curb the deterioration after an accident and avoid more serious consequences such as secondary damage. Placing thermal insulation pads between adjacent battery cells and modules can directly suppress the propagation of thermal runaway.
[0003] However, as the requirements for the driving range and safety of new energy vehicles continue to increase, the requirements for the heat insulation performance and thickness of heat insulation pads are also increasing. Existing heat insulation pads, which only have a single flame-retardant heat insulation layer, cannot effectively block heat and have great limitations, affecting the suppression effect of thermal runaway.
[0004] Based on this, a foamed silicone heat insulation pad for power battery modules is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content
[0005] The purpose of this invention is to provide a foamed silicone heat insulation pad for power battery modules to solve the problems in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: A foamed silicone heat insulation pad for a power battery module includes a first encapsulation film layer, a first buffer layer, a first heat insulation layer, a reflective layer, a second heat insulation layer, a second buffer layer, and a second encapsulation film layer. The first heat insulation layer and the second heat insulation layer are symmetrically disposed on both sides of the reflective layer. The first buffer layer and the second buffer layer are symmetrically disposed on both sides of the first heat insulation layer and the second heat insulation layer. The first encapsulation film layer and the second encapsulation film layer are symmetrically disposed on both sides of the first buffer layer and the second buffer layer.
[0007] Based on the above technical solutions, this utility model also provides the following optional technical solutions: In one alternative: the first encapsulation film layer and the second encapsulation film layer are either PI film or PET film.
[0008] In one alternative: the first and second buffer layers are made of foamed silicone.
[0009] In one alternative: the first and second insulation layers are made of glass fiber reinforced aerogel.
[0010] In one alternative: the reflective layer is either an aluminized PI film or an aluminum foil.
[0011] In one alternative: a row of segmented heat pipes is provided in both the first buffer layer and the second buffer layer.
[0012] In one alternative: the segmented heat pipe is composed of several hollow aluminum tubes and silicone partitions, with the silicone partitions located at the joints of the hollow aluminum tubes.
[0013] In one alternative: the inner wall of the hollow aluminum tube is provided with a groove, and an expandable graphite ring is embedded in the groove.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model uses a sandwich structure of "first heat insulation layer - reflective layer - second heat insulation layer" to insert an aluminum-plated PI film / aluminum foil reflective layer between two glass fiber reinforced aerogels. In the event of thermal runaway, the high-temperature radiant heat ejected by the monomer can be immediately reflected back. At the same time, the aerogel layer blocks the conductive heat, realizing the simultaneous suppression of "radiation-conduction" dual paths, which significantly prolongs the time for adjacent monomers to reach the thermal runaway trigger temperature.
[0015] 2. This utility model uses a foamed silicone buffer layer on the outside of the insulation layer to utilize its compression and rebound characteristics. During the expansion and collision of the battery cell during charging and discharging, the silicone buffer layer provides elastic relief, preventing the aerogel from cracking due to brittle fracture, thereby maintaining the integrity of the insulation barrier.
[0016] 3. This utility model implants a segmented heat-conducting pipe composed of a hollow aluminum tube, a silicone partition, and an expandable graphite ring inside a foamed silicone buffer layer. Under normal operating conditions, the aluminum tube quickly dissipates heat from the battery cell, reducing the temperature difference of the module. When the temperature exceeds the graphite expansion threshold, the graphite ring instantly expands to fill the aluminum tube, significantly reducing the heat transfer along the pipe. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model.
[0018] Figure 2 This is a structural schematic diagram of Embodiment 2 of the present invention.
[0019] Figure 3 This is a schematic diagram of the segmented heat pipe structure in Example 2.
[0020] Figure reference numerals: 100, first encapsulation film layer; 200, first buffer layer; 300, first heat insulation layer; 400, reflective layer; 500, second heat insulation layer; 600, second buffer layer; 700, second encapsulation film layer; 800, segmented heat pipe; 801, hollow aluminum tube; 802, silicone spacer; 803, slotted; 804, expandable graphite ring. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.
[0022] Example 1 In one embodiment, such as Figure 1 As shown, a foamed silicone heat insulation pad for a power battery module includes a first encapsulation film layer 100, a first buffer layer 200, a first heat insulation layer 300, a reflective layer 400, a second heat insulation layer 500, a second buffer layer 600, and a second encapsulation film layer 700. The first heat insulation layer 300 and the second heat insulation layer 500 are symmetrically arranged on both sides of the reflective layer 400. The first buffer layer 200 and the second buffer layer 600 are symmetrically arranged on both sides of the first heat insulation layer 300 and the second heat insulation layer 500. The first encapsulation film layer 100 and the second encapsulation film layer 700 are symmetrically arranged on both sides of the first buffer layer 200 and the second buffer layer 600. The encapsulation layer 100 and the second encapsulation layer 700 are made of either PI film or PET film. The first buffer layer 200 and the second buffer layer 600 are made of foamed silicone. The first heat insulation layer 300 and the second heat insulation layer 500 are made of glass fiber reinforced aerogel. The reflective layer 400 is made of either aluminized PI film or aluminum foil. The first encapsulation layer 100 and the second encapsulation layer 700 serve to provide high temperature resistance, insulation, and moisture protection. The first buffer layer 200 and the second buffer layer 600 serve to provide buffering. The first heat insulation layer 300 and the second heat insulation layer 500 serve to provide heat insulation. The reflective layer 400 serves to reflect heat radiation.
[0023] The above embodiments disclose a foamed silicone thermal insulation pad for power battery modules. Through a sandwich structure of "first thermal insulation layer 300 - reflective layer 400 - second thermal insulation layer 500", an aluminum-plated PI film / aluminum foil reflective layer is inserted between two glass fiber reinforced aerogels. In the event of thermal runaway, the high-temperature radiant heat ejected from the cell can be immediately reflected back. At the same time, the aerogel layer blocks the conductive heat, realizing the simultaneous suppression of "radiation-conduction" dual paths. In addition, by composite foamed silicone buffer layer on the outside of the thermal insulation layer, the compression rebound characteristics are utilized to generate elastic relief during the expansion and collision of the battery cell during charging and discharging, preventing the aerogel from cracking due to brittle fracture, thereby maintaining the integrity of the thermal insulation barrier.
[0024] Example 2 The difference from Example 1 is that, as Figure 2 and Figure 3 As shown, a row of segmented heat-conducting pipes 800 is provided in both the first buffer layer 200 and the second buffer layer 600. The segmented heat-conducting pipes 800 are composed of several hollow aluminum tubes 801 and silicone spacers 802. The silicone spacers 802 are set at the connection of the hollow aluminum tubes 801. The inner wall of the hollow aluminum tubes 801 is provided with grooves 803, and expandable graphite rings 804 are embedded in the grooves 803. By implanting the segmented heat-conducting pipes 800 composed of hollow aluminum tubes 801, silicone spacers 802 and expandable graphite rings 804 in the foamed silicone buffer layer, the aluminum tubes quickly conduct heat from the battery cell under normal operating conditions, reducing the temperature difference of the module. When the temperature exceeds the graphite expansion threshold, the graphite rings expand instantly to fill the aluminum tubes, significantly reducing the heat transfer along the pipes.
[0025] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A foamed silicone heat insulation pad for a power battery module, characterized in that, It includes a first encapsulation film layer (100), a first buffer layer (200), a first heat insulation layer (300), a reflective layer (400), a second heat insulation layer (500), a second buffer layer (600), and a second encapsulation film layer (700). The first heat insulation layer (300) and the second heat insulation layer (500) are symmetrically arranged on both sides of the reflective layer (400). The first buffer layer (200) and the second buffer layer (600) are symmetrically arranged on both sides of the first heat insulation layer (300) and the second heat insulation layer (500). The first encapsulation film layer (100) and the second encapsulation film layer (700) are symmetrically arranged on both sides of the first buffer layer (200) and the second buffer layer (600).
2. The foamed silicone heat insulation pad for a power battery module according to claim 1, characterized in that, The first encapsulation film layer (100) and the second encapsulation film layer (700) are either PI film or PET film.
3. The foamed silicone heat insulation pad for a power battery module according to claim 1, characterized in that, The first buffer layer (200) and the second buffer layer (600) are made of foamed silicone.
4. The foamed silicone heat insulation pad for a power battery module according to claim 1, characterized in that, The first insulation layer (300) and the second insulation layer (500) are made of glass fiber reinforced aerogel.
5. The foamed silicone heat insulation pad for a power battery module according to claim 1, characterized in that, The reflective layer (400) is made of either an aluminum-plated PI film or an aluminum foil.
6. A foamed silicone heat insulation pad for a power battery module according to claim 1, characterized in that, Each of the first buffer layer (200) and the second buffer layer (600) is provided with a row of segmented heat pipes (800).
7. A foamed silicone heat insulation pad for a power battery module according to claim 6, characterized in that, The segmented heat pipe (800) is composed of several hollow aluminum tubes (801) and silicone partitions (802), with the silicone partitions (802) disposed at the connection of the hollow aluminum tubes (801).
8. A foamed silicone heat insulation pad for a power battery module according to claim 7, characterized in that, The hollow aluminum tube (801) has a groove (803) on its inner wall, and an expandable graphite ring (804) is embedded in the groove (803).