Heating pad for battery module

Abstract

The invention relates to the field of heating pads, in particular to a heating pad for a battery module, which comprises a heating pad body, the heating pad body comprises a heating layer and a silica gel layer, the heating layer comprises a PI film, the surface of the PI film is fixedly provided with a frame used for enhancing the adhesiveness of the heating layer and the silica gel layer, the corners of the frame are provided with butt joint grooves, and the surface of the frame is also provided with grooves and exhaust holes. The silica gel layer comprises an outer surface layer, and the bottom surface of the outer surface layer is provided with a butt joint column and a raised line which are used for being embedded with the butt joint groove and the groove, and the butt joint groove formed in the frame and the butt joint column arranged on the bottom surface of the outer surface layer are matched with the embedding of the groove and the raised line, so that the phenomenon that the silica gel layer is damaged in the pressing process can be effectively avoided; the phenomenon of relative displacement between the heating layer and the silica gel layer due to uneven stress is avoided, the exhaust holes formed in one end of the frame can play a slow exhaust role on the contact surface of the heating layer and the silica gel layer when the heating layer and the silica gel layer are pressed, and the problem that air between the contact surface of the heating layer and the silica gel layer is not exhausted due to too fast pressing is avoided.

Description

Technical Field

[0001] The invention relates to the field of heating pads, and in particular to a heating pad for a battery module. Background Art

[0002] The main purpose of using a battery module with a heating pad is to ensure the working performance of the battery under different environmental conditions. This is because in a cold environment, especially when the temperature is below 0°C, the electrolyte viscosity of chemical batteries such as lithium-ion batteries increases, and the ion migration ability decreases, which leads to battery capacity decay, reduced charging and discharging efficiency, and even possible problems such as internal short circuit or expansion of the battery. When charging lithium-ion batteries at low temperatures, metal lithium deposition may occur, causing internal short circuits in the battery, thereby affecting the battery life and even causing safety hazards. The heating pad can effectively increase the temperature of the battery to ensure that the battery can still work normally in a low temperature environment; The heating pad used in existing battery modules is generally composed of heating element materials, insulating materials, thermal conductive materials, temperature control and sensor materials, among which the heating element materials, insulating materials and thermal conductive materials are integrated through lamination technology. In this process, this technology ensures good bonding between layers by stacking different materials together under high temperature or high pressure. However, the adhesion and thermal expansion coefficients of different materials will deviate at the same temperature, resulting in peeling, cracking or stratification of the laminated heating pad during use, which usually occurs between the heating element and the insulating material, and the thermal conductive layer and the outer protective layer. Summary of the invention

[0003] In view of this, the purpose of the present invention is to propose a heating pad for a battery module to solve the technical problem that the heating pad after lamination may peel off, crack or delaminate during use due to the deviation in the adhesion and thermal expansion coefficient of different materials at the same temperature during the integration of the heating element materials, insulating materials and thermal conductive materials that constitute the heating pad through lamination technology.

[0004] Based on the above purpose, the present invention provides a heating pad for a battery module, comprising a heating pad body for providing a heat source and a thermostat for controlling the temperature of the heating pad body, wherein the heating pad body comprises a heating layer, and silicone layers are pressed on both sides of the heating layer, and a docking component for connecting a power source is fixed inside the thermostat; The heating layer comprises a PI film, a contact and a heating wire are fixedly arranged inside the PI film, a frame is fixed on the surface of the PI film to enhance the adhesion between the heating layer and the silicone layer, a butt joint groove is provided at the edge corner of the frame, and a groove and an exhaust hole are also provided on the surface of the frame; The silicone layer comprises an outer layer, the bottom surface of which is provided with docking posts and convex strips for engaging with the docking grooves and the grooves, and the bottom surface of the outer layer is also provided with a pressing surface for contacting with the surface of the PI film; The docking assembly comprises a rotary sleeve, an inner seat is arranged inside the rotary sleeve, a plug-in is clamped inside the inner seat, a pole for conducting electricity is fixed inside the plug-in, and a contact block in contact with a contact point is inserted at the bottom of the pole.

[0005] Preferably, the frame, docking posts and convex strips are all made of foamed polyurethane.

[0006] Preferably, the outer surface layer is a component formed by woven glass fibers, and the pressed surface is a component made of silicone.

[0007] Preferably, the inner wall of the rotary sleeve is tapped to form an internal thread, and the outer surface of the external thread is threaded to form an external thread, and the rotary sleeve is connected to the inner seat through the internal thread and the external thread.

[0008] Preferably, the outer surface of the pull-out plug is provided with an annular groove which circles around its axis, and the inner seat is provided with multiple groups of through grooves, a fixing plate is fixed inside the through groove, a first spring is provided on one side of the fixing plate, a guide column is slidably arranged inside the fixing plate, and a block which is embedded in the annular groove is provided at one end of the guide column.

[0009] Preferably, a fixing ring is fixedly arranged inside the inner seat, a second spring is arranged on the surface of the fixing ring, and the second spring is connected to the contact block.

[0010] Preferably, a display screen is fixedly arranged inside the temperature controller.

[0011] Beneficial effects of the present invention: The present invention uses the docking grooves on the frame and the docking posts on the bottom surface of the outer layer to enable the heating layer and the silicone layer to find the appropriate position in advance during the splicing process. At the same time, the engagement of the grooves and the convex strips can effectively avoid the phenomenon of relative displacement between the heating layer and the silicone layer due to uneven force during the pressing process. The exhaust holes at one end of the frame can slowly exhaust the contact surfaces of the heating layer and the silicone layer when the two are pressed together, avoiding the problem that the air between the contact surfaces of the heating layer and the silicone layer is not completely exhausted due to excessive pressing. The pole and contact block fixed inside the pull-out plug are a plug-in structure. When the pull-out plug drives the pole to move upward, the contact block will automatically disconnect from the contact point, avoiding the residual current in the pole to flow into the heating wire after power failure, effectively improving the safety of the heating pad during use and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A magnified schematic diagram of point A; Figure 3 It is a schematic diagram of the heating layer structure of the present invention; Figure 4 Schematic diagram of the structure of the silica gel layer of the present invention; Figure 5 It is a schematic diagram of a half-section structure of a docking assembly of the present invention; Figure 6 For the present invention Figure 5 An enlarged schematic diagram of point B.

[0014] The numbers in the figure are: 1. Heating pad body; 11. Heating layer; 111. PI film; 112. Contact; 113. Heating wire; 114. Frame; 115. Docking groove; 116. Groove; 117. Exhaust hole; 12. Silicone layer; 121. Outer layer; 122. Docking column; 123. Raised strip; 124. Pressed surface; 2. Thermostat; 21. Display screen; 3. Docking assembly; 31. Rotary sleeve; 311. Internal thread; 32. Inner seat; 321. External thread; 322. Through groove; 323. Fixed sheet; 324. First spring; 33. Pull-out plug; 331. Pole; 332. Ring groove; 34. Fixed ring; 341. Second spring; 35. Contact block; 36. Guide column; 361. Block. DETAILED DESCRIPTION

[0015] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0016] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0017] To further understand the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0018] In a first aspect of the present invention, a heating pad for a battery module is provided. Figure 1-Figure 5 As shown, it includes a heating pad body 1 for providing a heat source and a thermostat 2 for controlling the temperature of the heating pad body 1, the heating pad body 1 includes a heating layer 11, and a silicone layer 12 is pressed on both sides of the heating layer 11, and a docking component 3 for connecting a power source is fixed inside the thermostat 2; The heating layer 11 comprises a PI film 111, a contact 112 and a heating wire 113 are fixedly arranged inside the PI film 111, a frame 114 is fixed on the surface of the PI film 111 to enhance the adhesion between the heating layer 11 and the silicone layer 12, a docking groove 115 is provided at the corner of the frame 114, and a groove 116 and an exhaust hole 117 are also provided on the surface of the frame 114; The silicone layer 12 includes an outer layer 121, and the bottom surface of the outer layer 121 is provided with a docking column 122 and a convex strip 123 for engaging with the docking groove 115 and the groove 116, and the bottom surface of the outer layer 121 is also provided with a pressing surface 124 in contact with the surface of the PI film 111; The docking assembly 3 includes a rotary sleeve 31, an inner seat 32 is provided inside the rotary sleeve 31, a plug-in connector 33 is clamped inside the inner seat 32, a pole 331 for conducting electricity is fixed inside the plug-in connector 33, and a contact block 35 in contact with the contact point 112 is inserted at the bottom of the pole 331. In this embodiment, firstly, the heating layer 11 uses PI film 111 as the main material. The PI film 111 is specifically made of polyimide film, which has high temperature resistance. It can usually work stably in the temperature range of -200°C to +400°C. Even some special types of PI films can withstand higher temperatures, which prevents the heating layer 11 and the heating layer 11 from deforming during the pressing process. At the same time, the PI film 111 has excellent electrical insulation, which effectively improves the safety of the heating wire 113 fixed inside the PI film 111 during use. The heating wire 113 uses a traditional copper ribbon, but the arrangement shape of the heating wire 113 is changed to a certain extent in this application, and the turning point of the heating wire 113 is increased, which makes the heating wire 113 have a larger heating area, effectively avoiding the slow preheating of the traditional heating pad. At the same time, a digital temperature controller 2 is provided at one end, which can effectively change the output voltage, thereby changing the current flow through the heating wire 113; Secondly, the docking groove 115 provided on the frame 114 and the docking column 122 provided on the bottom surface of the outer layer 121 enable the heating layer 11 and the silicone layer 12 to find the appropriate position in advance during the splicing process. At the same time, the engagement of the groove 116 and the convex strip 123 can effectively avoid the phenomenon of relative displacement between the heating layer 11 and the silicone layer 12 due to uneven force during the pressing process. The exhaust hole 117 provided at one end of the frame 114 can play a slow exhaust effect on the contact surface of the heating layer 11 and the silicone layer 12 when the heating layer 11 and the silicone layer 12 are pressed together, so as to avoid the problem that the air between the contact surface of the heating layer 11 and the silicone layer 12 is not completely exhausted due to the pressing too quickly. During the pressing, the pressing surface 124 of the bottom surface of the outer layer 121 can be tightly attached to the surface of the PI film 111. In this process, the pressing surface 124 can block the exhaust hole 117 to avoid the air from penetrating into the contact surface between the heating layer 11 and the silicone layer 12 from the exhaust hole 117 after the pressing is completed. Finally, the pole 331 and the contact block 35 fixed inside the plug-in unit 33 are a plug-in structure. When the plug-in unit 33 drives the pole 331 to move upward, the contact block 35 will automatically disconnect from the contact 112 to prevent the residual current inside the pole 331 from flowing into the heating wire 113 after power failure, thereby effectively improving the safety of the heating pad during use and maintenance. When the heating pad is needed, the plug-in unit 33 is pressed down to allow the pole 331 to dock with the contact block 35, and the contact block 35 is pressed to make it contact with the contact 112. Then, the rotary sleeve 31 is twisted to fix the plug-in unit 33 in the inner seat 32, and finally, current is passed through the pole 331.

[0019] As an implementation method, Figure 3 and Figure 4 As shown, further: The frame 114 , the docking posts 122 and the convex strips 123 are all made of foamed polyurethane.

[0020] In this embodiment, foam polyurethane is a flexible and lightweight material with good compression performance. It can provide uniform pressure between the heating layer 11 and the silicone layer 12 to ensure that they fit tightly. At the same time, foam polyurethane can maintain its shape under a wide range of pressures, and is suitable for occasions that require a certain degree of elasticity and uniform pressure distribution. It also has good insulation properties and is suitable for applications that require heat insulation or electrical insulation. The frame 114 made of foam polyurethane can effectively act as an adhesive between the heating layer 11 and the silicone layer 12. At the same time, foam polyurethane will self-melt under heating and pressure. Combined with the docking groove 115 and the docking column 122, as well as the groove 116 and the convex strip 123, the heating layer 11, the frame 114 and the silicone layer 12 can be well pressed together.

[0021] As an implementation method, Figure 4 As shown, further: The outer layer 121 is a component formed by weaving glass fibers, and the pressed surface 124 is a component made of silicone.

[0022] In this embodiment, the glass fiber in the outer layer 121 is also mixed with a thermal conductive material. The glass fiber has good mechanical strength and high temperature resistance, and the thermal conductivity depends on the added thermal conductive filler. This fabric not only has high thermal stability, but also provides a certain thermal conductivity. Its heat resistance is usually better than that of ordinary polymer fibers, so it performs well in high temperature environments. At the same time, the glass fiber in the outer layer 121 makes it have a certain wear resistance, which effectively extends the service life of the heating pad; The silicone material of the pressing surface 124 is actually thermal conductive silicone, which is similar to ordinary silicone, but contains thermal conductive materials such as aluminum oxide and silicon carbide, and has higher thermal conductivity. It can effectively conduct heat from the heating layer 11 to the outer layer 121. In addition to flexibility and high-temperature stability, the thermal conductivity of the thermal conductive silicone makes it perform better during pressing and heat conduction.

[0023] As an implementation method, Figure 5 As shown, further: The inner wall of the rotary sleeve 31 is tapped to form an internal thread 311 , and the outer surface of the external thread 321 is threaded to form an external thread 321 . The rotary sleeve 31 is connected to the inner seat 32 via the internal thread 311 and the external thread 321 .

[0024] In this embodiment, the internal thread 311 formed by tapping the inner wall of the rotary sleeve 31 occupies three-fifths of the overall height of the rotary sleeve 31, while the external thread 321 formed by threading the outer surface of the external thread 321 occupies one-fifth of the overall height of the inner seat 32. Through the cooperation between the external thread 321 and the internal thread 311, the rotary sleeve 31 can move up and down on the surface of the inner seat 32.

[0025] As an implementation method, Figure 6 As shown, further: The outer surface of the extraction plug 33 is provided with an annular groove 332 which is arranged around its axis, and the inner seat 32 is provided with a plurality of through grooves 322. A fixing plate 323 is fixed inside the through groove 322. A first spring 324 is provided on one side of the fixing plate 323. A guide column 36 is slidably arranged inside the fixing plate 323. A clamping block 361 which is embedded in the annular groove 332 is provided at one end of the guide column 36.

[0026] In this embodiment, the block 361 is a hemispherical metal, and its diameter is equal to the width of the annular groove 332. There are six annular grooves 332 in total. The guide column 36 at one end of the block 361 cooperates with the fixing plate 323 to prevent the block 361 from having position deviation when moving. When the pole 331 is pressed, the plug-in unit 33 moves downward in the inner seat 32. During the process, the plug-in unit 33 pushes the block 361 to enter the through groove 322. The first spring 324 is compressed under the action of the block 361 and the fixing plate 323. When the plug-in unit 33 moves downward to a certain distance, the annular groove 332 on its surface is flush with the position of the through groove 322. At this time, the first spring 324 releases kinetic energy, pushes the block 361 to pop out and snaps into the annular groove 332, fixing the plug-in unit 33 in advance. At this time, the pole 331 has been plugged into the contact block 35, and the contact block 35 is in contact with the contact point 112. Finally, the rotary sleeve 31 is twisted to make it descend along the height direction of the inner seat 32. The part of the inner wall of the rotary sleeve 31 without the internal thread 311 blocks the through groove 322, so that the guide column 36 cannot extend out of the through groove 322. At this time, the plug-in unit 33 is completely fixed in this position. When the rotary sleeve 31 is rotated to move upward along the height direction of the inner seat 32, the through slot 322 is exposed, and the guide column 36 can smoothly extend out of the through slot 322. At this time, pulling the pole 331 can drive the plug-in unit 33 to rise, thereby separating the pole 331 from the contact block 35, thus completing the operation of completely cutting off the power to the heating pad, which is convenient for maintenance personnel to repair the heating pad.

[0027] As an implementation method, Figure 5 As shown, further: A fixing ring 34 is fixedly disposed inside the inner seat 32 . A second spring 341 is disposed on the surface of the fixing ring 34 . The second spring 341 is connected to the contact block 35 .

[0028] In this embodiment, when the pole 331 pushes the contact block 35 to contact the contact 112, the second spring 341 is compressed under the interaction between the fixing ring 34 and the contact block 35. When the pole 331 is separated from the contact block 35, the second spring 341 releases kinetic energy to push the contact block 35 to separate from the contact 112.

[0029] As an implementation method, Figure 1 As shown, further: A display screen 21 is also fixedly disposed inside the temperature controller 2 .

[0030] In this embodiment, the thermostat 2 is composed of several parts, including the main body of the thermostat 2, a sensor and a control circuit. The main body of the thermostat 2 is the core part of the entire temperature control system, and is responsible for receiving signals from the temperature sensor, analyzing and processing them, and controlling the working state of the heating pad according to the set target temperature. The sensor is responsible for real-time monitoring of the current temperature of the heating pad and feeding back the temperature data to the control unit. The control circuit is responsible for controlling the power switch of the heating element according to the signal processed by the main body of the thermostat, thereby adjusting the temperature of the heating pad. The main body, sensor and control circuit of the thermostat 2 mentioned above are all prior art and will not be elaborated here. In this application, a display screen 21 is added to the thermostat 2, which can better integrate temperature, voltage and current information, and display them through intuitive numerical display, so that users or maintenance personnel can clearly see the current working temperature and set temperature of the heating pad.

[0031] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0032] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heating pad for a battery module, comprising a heating pad body for providing a heat source and a thermostat for controlling the temperature of the heating pad body, characterized in that: The heating pad body comprises a heating layer, with silicone layers pressed on both sides of the heating layer, and a docking component for connecting a power source is fixed inside the thermostat; The heating layer comprises a PI film, a contact and a heating wire are fixedly arranged inside the PI film, a frame is fixed on the surface of the PI film to enhance the adhesion between the heating layer and the silicone layer, a butt joint groove is provided at the edge corner of the frame, and a groove and an exhaust hole are also provided on the surface of the frame; The silicone layer comprises an outer layer, the bottom surface of which is provided with docking posts and convex strips for engaging with the docking grooves and the grooves, and the bottom surface of the outer layer is also provided with a pressing surface for contacting with the surface of the PI film; The docking assembly comprises a rotary sleeve, an inner seat is arranged inside the rotary sleeve, a plug-in is clamped inside the inner seat, a pole for conducting electricity is fixed inside the plug-in, and a contact block in contact with a contact point is inserted at the bottom of the pole.

2. A heating pad for a battery module according to claim 1, characterized in that: The frame, docking posts and convex strips are all parts made of foamed polyurethane.

3. A heating pad for a battery module according to claim 1, characterized in that: The outer surface is a component formed by weaving glass fibers, and the pressed surface is a component made of silicone.

4. A heating pad for a battery module according to claim 1, characterized in that: The inner wall of the rotary sleeve is tapped to form an internal thread, and the outer surface of the external thread is threaded to form an external thread. The rotary sleeve is connected to the inner seat through the internal thread and the external thread.

5. A heating pad for a battery module according to claim 4, characterized in that: The outer surface of the plug-in is provided with an annular groove which circles around its axis, and the inner seat is provided with multiple groups of through grooves, a fixing plate is fixed inside the through groove, a first spring is provided on one side of the fixing plate, a guide column is slidably arranged inside the fixing plate, and a block which is embedded in the annular groove is provided at one end of the guide column.

6. A heating pad for a battery module according to claim 1, characterized in that: A fixing ring is fixedly arranged inside the inner seat, a second spring is arranged on the surface of the fixing ring, and the second spring is connected to the contact block.

7. A heating pad for a battery module according to claim 1, characterized in that: A display screen is also fixedly arranged inside the temperature controller.

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