Soft package battery convenient for heat dissipation
By designing a multi-layer heat dissipation structure in a soft-pack lithium battery, using a combination of thermally conductive materials and coating layers, the expansion and explosion problems caused by heat accumulation of lithium batteries are solved, and better heat dissipation effect and service life are achieved.
Patent Information
- Application Number
- CN202420910189.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-29
AI Technical Summary
During the working process, the lithium battery produces heat quickly and has a high heat accumulation. If the heat cannot be dissipated in time, it may cause the lithium battery to expand and get out of control, or even explode, affecting its service life and working ability.
A soft-pack battery including a heat dissipation shell, a lithium battery body and an ear is designed. The heat dissipation shell consists of a second heat dissipation layer, a base layer, a first heat dissipation layer, a thermally conductive polyimide film and a coating layer, using thermally conductive silicon Materials such as grease, thermally conductive silicone, graphite sheets, aluminum foil and copper foil can enhance the heat dissipation effect through mutual cooperation and quickly discharge heat.
It effectively improves the heat dissipation performance of lithium batteries, extends the service life, reduces the risk of explosion, and ensures the stability of the battery in high temperature and radiation environments.
Smart Images
Figure CN222282112U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of soft-pack batteries, in particular to a soft-pack battery that is easy to dissipate heat. Background Art
[0002] Soft-pack lithium batteries are just liquid lithium-ion batteries covered with a polymer shell and structurally packaged with aluminum-plastic film. In the event of a safety hazard, the soft-pack battery will at most bulge and crack. At present, the discharge rate of soft-pack lithium batteries continues to increase. Due to the high rate, large instantaneous discharge current, high volume energy ratio, high weight energy ratio, wide operating temperature range, low self-consumption, and good cycle performance, it is widely used in model aircraft, drones, model racing cars, etc.
[0003] During operation, soft-pack batteries generate heat quickly and have a high heat concentration. If the heat cannot be discharged in time, the lithium battery itself will expand and greatly affect its own working ability and service life. In severe cases, thermal runaway may even occur and cause an explosion. Therefore, there is an urgent need for a soft-pack battery that is easy to dissipate heat to overcome the above defects. Utility Model Content
[0004] The utility model aims to provide a soft-pack battery that is easy to dissipate heat and has the advantage of good heat dissipation effect, so as to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a soft-pack battery that is easy to dissipate heat, comprising a heat dissipation shell, a lithium battery body and a pole ear, the lithium battery body is arranged inside the heat dissipation shell, the pole ear is fixedly installed on one side of the lithium battery body and the number is two, the heat dissipation shell comprises a second heat dissipation layer, a base layer, a first heat dissipation layer, a thermally conductive polyimide film and a coating layer, the second heat dissipation layer is arranged on the surface of the base layer, the thermally conductive polyimide film is arranged on the surface of the second heat dissipation layer, the first heat dissipation layer is arranged on the inner surface of the base layer, the coating layers are coated on the top and bottom of the lithium battery body, and the coating layers include thermally conductive silicone grease, thermally conductive silica gel and thermally conductive potting glue.
[0006] Furthermore, the second heat dissipation layer includes a thermally conductive silicone sheet, a thermally conductive gasket and a heat spreader, wherein the thermally conductive silicone sheet is arranged on the surface of the thermally conductive gasket, and the heat spreader is arranged on the inner surface of the thermally conductive gasket.
[0007] Furthermore, the thermally conductive potting glue is coated on the surface of the lithium battery body, the thermally conductive silicone is coated on the surface of the thermally conductive potting glue, and the thermally conductive silicone grease is coated on the surface of the thermally conductive silicone.
[0008] Furthermore, the first heat dissipation layer includes a graphite sheet, an aluminum foil and a copper foil, wherein the graphite sheet is arranged on the surface of the aluminum foil, and the copper foil is arranged on the inner surface of the aluminum foil.
[0009] Furthermore, the thickness of the graphite sheet is greater than the thickness of the aluminum foil, and the thickness of the aluminum foil is less than the thickness of the copper foil.
[0010] Furthermore, the surface of the thermally conductive silicone grease is bonded to the inner surface of the copper foil.
[0011] Furthermore, the thickness of the thermally conductive polyimide film is 0.12 mm.
[0012] In summary, due to the adoption of the above technology, the beneficial effects of the utility model are:
[0013] The utility model discharges the heat of the lithium battery body by arranging a heat dissipation shell, facilitates the power supply connection to the equipment by arranging the pole ear, and enhances the heat dissipation coefficient of the heat dissipation shell by arranging the mutual cooperation among the second heat dissipation layer, the coating layer, the first heat dissipation layer and the thermally conductive polyimide film. When the lithium battery body generates heat, the heat is quickly dissipated. The thermally conductive polyimide film is a polymer material with stable chemical structure, large molecular weight, high strength, good rigidity, high crystallinity and good thermal stability. It has multiple excellent properties such as high temperature resistance, corrosion resistance and radiation resistance. It is widely used in aerospace, electronics, optics and other fields, and has the advantage of good heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the structure of the utility model;
[0015] Figure 2 This is a schematic diagram of the heat dissipation housing structure of the utility model;
[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of the first heat dissipation layer of the utility model;
[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the coating layer of the utility model;
[0018] Figure 5 It is a schematic diagram of the cross-sectional structure of the second heat dissipation layer of the utility model.
[0019] In the figure: 1. heat dissipation shell; 2. lithium battery body; 3. pole ear; 4. second heat dissipation layer; 41. thermal conductive silicone sheet; 42. thermal conductive gasket; 43. heat spreader; 5. base layer; 6. first heat dissipation layer; 61. graphite sheet; 62. aluminum foil; 63. copper foil; 7. thermal conductive polyimide film; 8. coating layer; 81. thermal conductive silicone grease; 82. thermal conductive silicone; 83. thermal conductive potting glue. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.
[0021] The utility model provides Figure 1-5 As shown, a soft-pack battery for heat dissipation includes a heat dissipation shell 1, a lithium battery body 2 and a pole ear 3, wherein the lithium battery body 2 is arranged inside the heat dissipation shell 1, and the pole ear 3 is fixedly installed on one side of the lithium battery body 2 and the number is two, the heat dissipation shell 1 includes a second heat dissipation layer 4, a base layer 5, a first heat dissipation layer 6, a thermally conductive polyimide film 7 and a coating layer 8, the second heat dissipation layer 4 is arranged on the surface of the base layer 5, the thermally conductive polyimide film 7 is arranged on the surface of the second heat dissipation layer 4, the first heat dissipation layer 6 is arranged on the inner surface of the base layer 5, and the coating layer 8 is coated on the top and bottom of the lithium battery body 2, and the coating layer 8 includes a thermally conductive silicone grease 81, a thermally conductive silica gel 82 and a thermally conductive potting glue 83;
[0022] More specifically, the heat of the lithium battery body 2 is discharged by setting the heat dissipation shell 1, the power supply connection to the equipment is convenient by setting the pole ear 3, and the heat dissipation coefficient of the heat dissipation shell 1 is enhanced by setting the mutual cooperation among the second heat dissipation layer 4, the coating layer 8, the first heat dissipation layer 6 and the thermally conductive polyimide film 7. When the lithium battery body 2 generates heat, the heat is quickly dissipated. The thermally conductive polyimide film 7 is a polymer material with stable chemical structure, large molecular weight, high strength, good rigidity, high crystallinity and good thermal stability. It has many excellent properties such as high temperature resistance, corrosion resistance and radiation resistance, and is widely used in aerospace, electronics, optics and other fields.
[0023] In some embodiments, the second heat dissipation layer 4 includes a thermally conductive silicone sheet 41, a thermally conductive gasket 42 and a heat spreader 43. The thermally conductive silicone sheet 41 is arranged on the surface of the thermally conductive gasket 42, and the heat spreader 43 is arranged on the inner surface of the thermally conductive gasket 42. More specifically, by arranging the thermally conductive silicone sheet 41, the lithium battery body 2 can effectively generate a large amount of heat during operation, and the heat dissipation function can be achieved. By arranging the thermally conductive gasket 42 with good thermal conductivity, heat energy can be quickly transferred. By arranging the heat spreader 43, an efficient heat dissipation device is provided, which improves the heat dissipation efficiency and prevents problems such as overheating by forming a uniform heat distribution inside the radiator.
[0024] In some embodiments, the thermally conductive potting glue 83 is coated on the surface of the lithium battery body 2, the thermally conductive silicone 82 is coated on the surface of the thermally conductive potting glue 83, and the thermally conductive silicone grease 81 is coated on the surface of the thermally conductive silicone grease 82. More specifically, by setting the thermally conductive potting glue 83, it has excellent electrical insulation performance, can withstand environmental pollution, and avoid damage to the product caused by environmental factors such as stress, vibration and humidity. It is particularly suitable for products that require good heat dissipation of the potting material. The product has excellent physical and chemical resistance. By setting the thermally conductive silicone 82, it has excellent resistance to cold and hot alternation, aging resistance and electrical insulation performance. It is a high thermal conductivity silicone material that can achieve good heat conduction between the battery and the heat dissipation components to improve the heat dissipation effect. By setting the thermally conductive silicone grease 81, commonly known as heat dissipation paste, it takes organic silicone as the main raw material and adds heat-resistant and thermally conductive materials to make a thermally conductive organic silicone grease-like composite, which is used for heat conduction and heat dissipation of electronic components such as power amplifiers, transistors, electron tubes, CPUs, etc., thereby ensuring the stability of the electrical performance of electronic instruments and meters.
[0025] In some embodiments, the first heat dissipation layer 6 includes a graphite sheet 61, an aluminum foil 62 and a copper foil 63, wherein the graphite sheet 61 is arranged on the surface of the aluminum foil 62, and the copper foil 63 is arranged on the inner surface of the aluminum foil 62. More specifically, by arranging the graphite sheet 61 to have good thermal conductivity and heat dissipation capability, it can be used in the heat dissipation design of the battery to improve the conduction and dissipation of heat.
[0026] In some embodiments, the thickness of the graphite sheet 61 is greater than the thickness of the aluminum foil 62, and the thickness of the aluminum foil 62 is less than the thickness of the copper foil 63. More specifically, by setting the aluminum foil 62 to have a material with good electrical and thermal conductivity, and at the same time being a good thermal insulation material, its own thermal conductivity is very high and can quickly transfer heat, thereby playing a certain heat dissipation role.
[0027] In some embodiments, the surface of the thermal grease 81 is bonded to the inner surface of the copper foil 63. More specifically, the copper foil 63 has good thermal conductivity and is a common heat dissipation material. The heat dissipation principle is to use its own thermal conductivity to form a heat transfer channel between the internal heat source and the external heat sink, and transfer the heat of the internal heat source to the final heat sink through conduction and radiation to achieve the heat dissipation effect.
[0028] In some embodiments, the thickness of the thermally conductive polyimide film 7 is 0.12 mm. More specifically, the thermally conductive polyimide film 7 also contains some ionic groups and double bond groups in its molecular chain, and these groups can also improve the thermal conductivity of the polymer.
[0029] Working principle:
[0030] Step 1: The heat of the lithium battery body 2 is discharged by setting the heat dissipation shell 1, and the power supply connection of the device is convenient by setting the pole ear 3. The heat dissipation coefficient of the heat dissipation shell 1 is enhanced by setting the cooperation between the second heat dissipation layer 4, the coating layer 8, the first heat dissipation layer 6 and the thermal conductive polyimide film 7. When the lithium battery body 2 generates heat, it can quickly dissipate the heat. The thermal conductive polyimide film 7 is a polymer material with stable chemical structure, large molecular weight, high strength, good rigidity, high crystallinity and good thermal stability. It has many excellent properties such as high temperature resistance, corrosion resistance and radiation resistance, and is widely used in aerospace, electronics, optics and other fields;
[0031] Step 2: By setting the heat-conductive potting glue 83, it has excellent electrical insulation performance, can withstand environmental pollution, avoid damage to the product caused by environmental factors such as stress, vibration and humidity, and is particularly suitable for products that require good heat dissipation of the potting material. The product has excellent physical and chemical resistance. By setting the thermal conductive silicone 82, it has excellent resistance to cold and hot alternation, aging resistance and electrical insulation performance. It is a high thermal conductivity silicone material that can conduct good heat between the battery and the heat dissipation component to improve the heat dissipation effect. By setting the thermal conductive silicone grease 81, commonly known as heat dissipation paste, with organic silicone as the main raw material, adding heat-resistant and excellent thermal conductive materials, the thermal conductive organic silicone grease-like compound is made, which is used for heat conduction and heat dissipation of electronic components such as power amplifiers, transistors, electron tubes, CPUs, etc., thereby ensuring the stability of the electrical performance of electronic instruments and meters;
[0032] Step three: By setting the graphite sheet 61 to have good thermal conductivity and heat dissipation capacity, it can be used in the heat dissipation design of the battery to improve the conduction and dissipation of heat. By setting the aluminum foil 62 to have a material with good electrical and thermal conductivity, it is also a good thermal insulation material. Its own thermal conductivity is very high and it can quickly transfer heat, thereby playing a certain heat dissipation role. By setting the copper foil 63 to have good thermal conductivity, it is a common heat dissipation material. Its heat dissipation principle is to use its own thermal conductivity to form a heat transfer channel between the internal heat source and the external radiator, and transfer the heat of the internal heat source to the final radiator through conduction and radiation to achieve the heat dissipation effect.
[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
Claims
1. A soft pack battery that is easy to dissipate heat, characterized in that: The invention comprises a heat dissipation shell (1), a lithium battery body (2) and a tab (3), wherein the lithium battery body (2) is arranged inside the heat dissipation shell (1), and two tabs (3) are fixedly mounted on one side of the lithium battery body (2). The heat dissipation shell (1) comprises a second heat dissipation layer (4), a base layer (5), a first heat dissipation layer (6), a heat conductive polyimide film (7) and a coating layer (8), wherein the second heat dissipation layer (4) is arranged on the surface of the base layer (5), the heat conductive polyimide film (7) is arranged on the surface of the second heat dissipation layer (4), the first heat dissipation layer (6) is arranged on the inner surface of the base layer (5), and the coating layer (8) is coated on the top and bottom of the lithium battery body (2), and the coating layer (8) comprises heat conductive silicone grease (81), heat conductive silica gel (82) and heat conductive potting glue (83).
2. The soft pack battery for heat dissipation according to claim 1, characterized in that: The second heat dissipation layer (4) comprises a thermally conductive silicone sheet (41), a thermally conductive gasket (42) and a heat spreader (43); the thermally conductive silicone sheet (41) is arranged on the surface of the thermally conductive gasket (42), and the heat spreader (43) is arranged on the inner surface of the thermally conductive gasket (42).
3. The soft pack battery for heat dissipation according to claim 1, characterized in that: The thermally conductive potting glue (83) is coated on the surface of the lithium battery body (2), the thermally conductive silica gel (82) is coated on the surface of the thermally conductive potting glue (83), and the thermally conductive silicone grease (81) is coated on the surface of the thermally conductive silica gel (82).
4. The soft pack battery for heat dissipation according to claim 1, characterized in that: The first heat dissipation layer (6) comprises a graphite sheet (61), an aluminum foil (62) and a copper foil (63); the graphite sheet (61) is arranged on the surface of the aluminum foil (62), and the copper foil (63) is arranged on the inner surface of the aluminum foil (62).
5. The soft pack battery for heat dissipation according to claim 4, characterized in that: The thickness of the graphite sheet (61) is greater than the thickness of the aluminum foil (62), and the thickness of the aluminum foil (62) is less than the thickness of the copper foil (63).
6. The soft pack battery for heat dissipation according to claim 1, characterized in that: The surface of the thermally conductive silicone grease (81) is bonded to the inner surface of the copper foil (63).
7. The soft pack battery for heat dissipation according to claim 1, characterized in that: The thickness of the thermally conductive polyimide film (7) is 0.12 mm.