Flexible battery based on shape memory material and electronic product

Abstract

The application provides a flexible battery based on a shape memory material and an electronic product, and relates to the technical field of battery manufacturing. The flexible battery comprises a shape memory support and a battery body. The material of the shape memory support comprises a shape memory polymer and / or a shape memory alloy. The shape memory support comprises two mutually parallel and spaced deformation plates and a support assembly arranged between the two deformation plates. The two deformation plates are connected through the support assembly. The battery body is arranged in parallel between the two deformation plates. The support assembly is distributed along the side of the battery body. The application can solve the problem that the flexible battery in the prior art does not have a shape retaining function.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, in particular to a flexible battery based on shape memory material and electronic product. BACKGROUND

[0002] In recent years, with the rapid progress of electronic technology, more and more electronic devices are developing towards lightness, flexibility and wearability. Among them, flexible electronic devices are an important research direction, and flexible batteries that can change shape and maintain shape are a focus of flexible electronic device research. Lithium ion batteries have high energy density, good cycle performance and good stability, and are the most ideal candidate for developing flexible energy storage devices.

[0003] However, although some flexible batteries have appeared on the market, they usually do not have the ability to maintain shape, resulting in users still needing to exert external force on them when carrying, reducing their portability. SUMMARY

[0004] The present application aims to solve the problem that the flexible battery in the prior art does not have the ability to maintain its deformed shape.

[0005] To solve the above problems, the present application provides a flexible battery based on shape memory material and electronic product. In a first aspect, the present application provides a flexible battery based on shape memory material, comprising a shape memory support and a battery body;

[0006] The material of the shape memory support comprises a shape memory polymer and / or a shape memory alloy;

[0007] The battery body is a flexible deformable structure;

[0008] The shape memory support comprises two deformed plates arranged in parallel and spaced apart, and a support assembly arranged between the two deformed plates, the two deformed plates are connected through the support assembly, the battery body is arranged in parallel between the two deformed plates, and the support assembly is distributed along the edge side of the battery body.

[0009] Optionally, the support assembly comprises a support bar, the top and bottom of the support bar are connected with the two deformed plates respectively, and the support bar is distributed in the length and / or width direction of the battery body.

[0010] Optionally, the support bar comprises a plurality of V-shaped support portions connected with each other; or the support bar is in a wave shape; or the support bar is in a mesh shape.

[0011] Optionally, the support assembly further comprises at least two elastic supports, two ends of each of the elastic supports are connected with two deformation plates respectively, and the at least two elastic supports are symmetrically distributed at corner positions of the deformation plates.

[0012] Optionally, materials of the deformation plates and the support bars comprise shape memory polymers, and a material of the elastic supports comprises a shape memory alloy.

[0013] Optionally, the flexible battery further comprises a temperature adjusting device, the temperature adjusting device comprises a heating element and a control switch, the heating element is arranged on the shape memory support, the heating element is electrically connected with the battery body, and the control switch is used for controlling on-off of the electrical connection between the heating element and the battery body.

[0014] Optionally, the materials of the deformation plates and the support bars further comprise conductive fillers, and the deformation plates and / or the support bars are electrically connected with the battery body.

[0015] Optionally, the flexible battery further comprises a flexible shell, and the flexible shell is sleeved outside the shape memory support.

[0016] Optionally, the battery body comprises a positive electrode tab and a negative electrode tab, and the flexible shell is provided with an opening through which the positive electrode tab and the negative electrode tab extend.

[0017] In a second aspect, the present application further provides an electronic product, and the electronic product comprises the above flexible battery based on shape memory materials.

[0018] The present application has the following beneficial effects compared with the prior art:

[0019] The embodiments of the present invention utilize the shape memory function of a shape memory bracket to drive the deformation of the battery body. Specifically, the upper and lower layers of the shape memory bracket are deformable plates made of shape memory material, and the middle layer is the battery body. The upper and lower deformable plates are connected by a support assembly. The shape memory bracket is then heated to a transition temperature. When the temperature reaches the transition temperature, the material softens and the rigidity of the overall structure is significantly reduced. At this point, the shape memory bracket and the battery body inside it can be manually bent to fit tightly to the surface of the target object. Subsequently, heating is stopped, and when the temperature of the shape memory bracket drops below the transition temperature, the rigidity of the overall structure is restored and locked in the shape, thereby maintaining its fit state, resolving the problem that flexible batteries in the prior art do not have the ability to maintain a deformed shape. After this, no matter what shape the user sets the flexible battery to, simply heat the shape memory bracket again to above the transition temperature, and the structure will spontaneously return to its original shape, thereby improving the battery's flexibility and adaptability. In addition, the present invention sandwiches the battery body between the upper and lower deformation plates, which can make the battery structure more compact without affecting the overall deformation function. The support component can provide stronger shape recovery performance and can fix and protect the battery body, thereby further improving the stability of the battery body in the shape memory bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the external structure of a flexible battery in an embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the internal structure of a flexible battery in an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the external structure of the battery body in an embodiment of the present invention;

[0023] Figure 4 Schematic diagram of the internal structure of the battery body in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the overall structure of the flexible battery when bent in an embodiment of the present invention;

[0025] Figure 6 This is a side view of the flexible battery when it is bent in an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1, shape memory stent; 11, deformation plate; 12, support assembly; 121, support stop; 1211, V-shaped support part; 122, elastic support; 2, battery body; 21, external insulating sealing layer; 22, positive plate; 23, internal insulating layer; 24, negative plate; 25, positive tab; 26, negative tab; 3, temperature adjusting device; 31, heating piece; 32, control switch; 4, flexible shell; 41, opening. DETAILED DESCRIPTION

[0028] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings. Although some embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms, and should not be interpreted as being limited to the embodiments described herein, on the contrary, these embodiments are provided to make the present application more thorough and complete. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes, and are not intended to limit the scope of protection of the present application.

[0029] The Z-axis in the drawings represents the vertical direction, that is, the up-down position, and the positive direction of the Z-axis represents the upper side, and the negative direction of the Z-axis represents the lower side; the X-axis in the drawings represents the horizontal direction, and is designated as the front-rear position, and the positive direction of the X-axis represents the front side, and the negative direction of the X-axis represents the rear side; the Y-axis in the drawings represents the left-right position, and the positive direction of the Y-axis represents the left side, and the negative direction of the Y-axis represents the right side. It should be noted that the meanings of the aforementioned Z-axis, Y-axis and X-axis are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0030] The term "comprising" and variations thereof as used herein are open-ended, that is "including, but not limited to"; the term "based on" is "based, at least in part, on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". Related definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in the present application are only used to distinguish different devices, modules or units, and are not intended to limit the order or interdependence of the functions performed by these devices, modules or units.

[0031] It should be noted that the modification of "one" or "multiple" mentioned in the present application is illustrative and not limiting, and those skilled in the art should understand that, unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0032] Shape memory material refers to a product with an initial shape, which can restore its initial shape through external conditions (such as heat, electricity, light, chemical sensing, etc.) after changing its initial conditions and fixing under certain conditions. Among them, the materials with shape memory function include shape memory polymers such as epoxy resin, polyurethane, polypropylene, polystyrene and polyvinyl alcohol. The thermally induced shape memory polymer is the most common shape memory polymer, which can realize the shape memory process under the driving of heat. By increasing the temperature above the transition temperature, while applying an external force to change the shape, then reducing the temperature to fix the temporary shape, and finally increasing the temperature above the transition temperature again, the initial shape can be restored. In addition, the materials with shape memory function also include shape memory alloys, which are materials composed of two or more metal elements that have shape memory effect through thermal elasticity and martensitic transformation and its inverse transformation, such as nickel-titanium-based shape memory alloy, copper-based shape memory alloy and iron-based shape memory alloy.

[0033] Based on the above related technology, in order to solve the problem that the flexible battery does not have the shape change shape in the prior art, the embodiment of the present application provides a flexible battery based on shape memory material and electronic product. The flexible battery utilizes the thermal characteristics of shape memory material, that is, it is hard and rigid at room temperature, but it softens rapidly when the temperature reaches a certain temperature, and it is flexible and plastic. This feature enables the flexible battery and its corresponding electronic product to bend and adhere to the surface of the human body or other electronic products after heating. At the same time, after cooling, the flexible battery can maintain the shape given, thereby realizing the combination of flexibility, portability and structural stability. The following will be described in detail in combination with Figure 1 -figures.

[0034] In a first aspect, the embodiment of the present application provides a flexible battery based on shape memory material, referring to Figure 1 and Figure 2 As shown, the flexible battery includes a shape memory support 1 and a battery body 2, the material of the shape memory support 1 includes shape memory polymer and / or shape memory alloy, and the battery body 2 is a flexible deformable structure. The shape memory support 1 includes two deformed plates 11 arranged in parallel and spaced apart, and a support assembly 12 arranged between the two deformed plates 11, the two deformed plates 11 are connected through the support assembly 12, the battery body 2 is arranged in parallel between the two deformed plates 11, and the support assembly 12 is distributed along the side of the battery body 2.

[0035] The embodiment of the present application utilizes the shape memory function of the shape memory support 1 to drive the battery body 2 to deform. Specifically, the upper and lower layers of the shape memory support 1 are made of deforming plates 11 of shape memory material, and the middle layer is the battery body 2. The upper and lower layers of the deforming plates 11 are connected through a support assembly 12. Then the shape memory support 1 is heated to the transition temperature. When the temperature reaches the transition temperature value, the material softens, and the rigidity of the overall structure is significantly reduced. At this time, as shown in Figure 5 and Figure 6 , the shape memory support 1 and the battery body 2 inside it can be bent by manual operation to tightly fit the surface of the target object. Then, stop heating, and when the temperature of the shape memory support 1 drops below the transition temperature value, the rigidity of the overall structure is restored and locked in the shape, thereby maintaining its fitting state. After that, no matter what shape the user sets the flexible battery to, as long as the shape memory support 1 is heated again to above the transition temperature value, the structure can spontaneously recover to the initial shape to improve the flexibility and adaptability of the electronic product. In addition, the present application sandwiches the battery body 2 between the upper and lower layers of the deforming plates 11, which can make the battery structure more compact without affecting the overall deformation function. The support assembly 12 can provide stronger shape recovery performance and can fix and protect the battery body 2, thereby further improving the stability of the battery body 2 in the shape memory support 1.

[0036] Optionally, as shown in Figure 2 , the support assembly 12 includes a support bar 121, the top and bottom of the support bar 121 are connected with the two deforming plates 11 respectively, and the support bar 121 is distributed along the length and / or width direction of the battery body 2. Among them, in some optional embodiments, the support bar 121 can be distributed only along the length direction of the battery body 2, and in some other embodiments, the support bar 121 can be distributed along the length of the four edges of the battery body 2, and is disconnected at the position where the electrode sheet extends, so that when the flexible battery is bent in different directions, it has better structural stability.

[0037] As shown in Figure 2 , in some optional embodiments, the support bar 121 includes a plurality of V-shaped support portions 1211 connected with each other. Alternatively, in some other embodiments, the support bar 121 can be in a wave shape or a mesh shape.

[0038] The embodiment of the present application arranges the support bar 121 in a V-shaped, wave-shaped or mesh-shaped shape, which is more conducive to bending the overall structure compared to straight-line support, thereby improving the structural stability during deformation and shape recovery.

[0039] In some optional embodiments, the material of the deformation plate 11 comprises a matrix and a reinforcing material, wherein the matrix can be selected from shape memory epoxy resin, shape memory cyanate ester resin, polyurethane and the like which are resistant to electrolyte solvent erosion environment, and the reinforcing material can be selected from carbon fiber or glass fiber cloth. Similarly, the material of the support bar 121 can also be selected from epoxy resin, shape memory cyanate ester resin, polyurethane and the like. At the connecting part of the support bar 121 and the deformation plate 11, the same shape memory polymer as the deformation plate 11 and the support bar 121 can be used for curing to improve the stability of the connection and the stability of the shape recovery process.

[0040] In some optional embodiments, the matrix in the deformation plate 11 and the material of the support bar 121 can also comprise conductive fillers, and the deformation plate 11 and / or the support bar 121 are electrically connected with the battery body 2. Specifically, the conductive fillers such as graphene, carbon nanotubes and metal particles can be added in the polymer matrix such as epoxy resin to achieve the electrical connection. The deformation plate 11 and / or the support bar 121 with conductive performance are electrically connected with the battery body 2, and a corresponding switch is arranged. The conductive fillers form a conductive path in the polymer matrix, and when current passes through, heat is generated to increase the temperature of the material, and then the material is softened to achieve the shape recovery process. Thus, the shape memory support 1 can be powered by the battery body 2 to generate heat and deform without additional heating device.

[0041] Optionally, as shown in Figure 2 The support assembly 12 further comprises at least two elastic supports 122, both ends of each elastic support 122 are connected with two deformation plates 11 respectively, and the at least two elastic supports 122 are symmetrically distributed at the corner positions of the deformation plates 11. In some specific embodiments, the number of the elastic supports 122 can be two, and the two elastic supports 122 are symmetrically distributed at the diagonal corners of the deformation plates 11. Of course, the number of the elastic supports 122 can also be four, and the four elastic supports 122 are distributed at the four corners of the deformation plates 11. The elastic support 122 can be a spring, and the material of the elastic support 122 can be shape memory alloy. The elastic support 122 can provide stronger shape recovery performance.

[0042] Optionally, as shown in Figure 1 and Figure 2As shown, the flexible battery further comprises a temperature adjusting device 3, which comprises a heating element 31 and a control switch 32. The heating element 31 is arranged on the shape memory support 1 and is electrically connected to the battery body 2, specifically connected to the positive and negative poles of the battery body 2 through the lead-out wires. The control switch 32 is used to control the on-off of the electrical connection between the heating element 31 and the battery body 2. Specifically, the heating element 31 can be a heating film pasted on the surface of the deformation plate 11, or a heating wire solidified on the surface of the deformation plate 11. Among them, the heating film and the shape memory polymer composite material are bonded by high-temperature-resistant and corrosion-resistant high-temperature-resistant epoxy resin or fluorinated polymer glue, and the outermost layer is bonded again by high-temperature-resistant polyimide tape to prevent the heating film from falling off.

[0043] Optionally, referring to Figure 3 and Figure 4 As shown, the battery body 2 comprises an external insulating sealing layer 21, a positive pole sheet 22, an internal insulating layer 23, a negative pole sheet 24, a positive pole lug 25 and a negative pole lug 26. The positive pole sheet 22 and the negative pole sheet 24 are arranged alternately and stacked inside the battery body 2. Each adjacent two positive pole sheets 22 and negative pole sheets 24 are insulated by the internal insulating layer 23. The external insulating sealing layer 21 is used to form a sealed cavity to accommodate the positive pole sheet 22, the internal insulating layer 23, the negative pole sheet 24 and the electrolyte, and to insulate the inside and outside of the battery body to prevent the electrolyte inside the battery from leaking . . The positive pole lug 25 extends out of the battery body 2 and is electrically connected to the positive pole sheet 22 stacked inside the battery body 2 (specifically connected through a connecting sheet). Correspondingly, the negative pole lug 26 also extends out of the battery body 2 and is electrically connected to the negative pole sheet 24 stacked inside the battery body 2 (specifically connected through a connecting sheet). In addition, the external insulating sealing layer 21 also has two outlets for the positive pole lug 25 and the negative pole lug 26 to extend out, and the outlets are sealed by high-temperature-resistant and corrosion-resistant materials such as high-temperature-resistant epoxy or fluorinated polymer glue. Specifically, graphene can be selected as the material of the positive pole sheet 22 and the negative pole sheet 24. The materials of the internal insulating layer 23 and the external insulating sealing layer 21 can be polyimide, polytetrafluoroethylene or other high-insulation, high-temperature-resistant and chemical corrosion-resistant plastics. The battery body 2 in the embodiment of the present application is used to provide electric energy, which can not only provide power for the operation of the external system, but also provide power for the shape memory support 1 or the temperature adjusting device 3.

[0044] Optionally, referring to Figure 1As shown, the flexible battery further comprises a flexible shell 4, which is sleeved outside the shape memory support 1 and is used to fix the components inside the flexible battery. The flexible shell 4 is made of elastic material, which can be silicone or thermoplastic polyurethane, so as to ensure that it has good flexibility and buffering performance when fixing the components inside the battery. In addition, the flexible shell 4 is also provided with an opening 41 for the positive plate 22 and the negative plate 24 to extend out, and the control switch 32 for controlling the electrical connection between the heating element 31 and the battery body 2 can be arranged on the flexible shell 4 for convenient control. Further, in order to improve the structural stability of the flexible battery after deformation, a fixing hole and a mounting protrusion can be respectively arranged at both ends of the flexible shell 4, so that the flexible battery can be better fixed after bending deformation.

[0045] In a second aspect, based on the above flexible battery, the embodiments of the present application further provide an electronic product, which comprises the above flexible battery based on the shape memory material. Specifically, the electronic product can be a smart wearable device such as a foldable display screen, a foldable mobile phone, an electronic belt, an electronic bracelet, etc. Figure 5 and Figure 6 As shown, in actual use, the flexible battery can be installed in the above electronic product to realize the bending deformation of the electronic product.

[0046] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications shall fall within the protection scope of the present application.

Claims

1. A flexible battery based on shape memory material, characterized in that, The shape memory bracket (1) comprises two mutually parallel and spaced apart deformation plates (11) and a support assembly (12) arranged between the two deformation plates (11), the two deformation plates (11) are connected through the support assembly (12), and the battery body (2) is arranged in parallel between the two deformation plates (11); the support assembly (12) is distributed along the length and / or width direction of the battery body (2). The support assembly (12) comprises a support bar (121), the top and bottom of the support bar (121) are connected with the two deformation plates (11) respectively, and the support bar (121) is distributed along the length and / or width direction of the battery body (2); the support bar (121) comprises a plurality of mutually connected V-shaped support portions (1211); or, the support bar (121) is in a wave shape; or, the support bar (121) is in a mesh shape. The support assembly (12) further comprises at least two elastic support members (122), both ends of each elastic support member (122) are connected with the two deformation plates (11) respectively, and the at least two elastic support members (122) are symmetrically distributed at the corner positions of the deformation plates (11).

2. The flexible battery based on shape memory material according to claim 1, characterized in that, The materials of the deformation plates (11) and the support bar (121) comprise shape memory polymers, and the material of the elastic support members (122) comprises shape memory alloys.

3. The flexible battery based on shape memory material according to claim 2, characterized in that, The materials of the deformation plates (11) and the support bar (121) further comprise conductive fillers, and the deformation plates (11) and / or the support bar (121) are electrically connected with the battery body (2).

4. The flexible battery based on shape memory material according to claim 3, characterized in that, Further comprising a temperature adjusting device (3), the temperature adjusting device (3) comprises a heating element (31) and a control switch (32), the heating element (31) is arranged on the shape memory bracket (1), the heating element (31) is electrically connected with the battery body (2), and the control switch (32) is used for controlling the on-off of the electrical connection between the heating element (31) and the battery body (2).

5. The flexible battery based on shape memory material according to claim 1, wherein, Further comprising a flexible shell (4), the flexible shell (4) is sleeved outside the shape memory bracket (1).

6. The flexible battery based on shape memory material according to claim 1, wherein, The battery body (2) comprises a positive electrode lug (25) and a negative electrode lug (26), and the flexible shell (4) is provided with an opening (41) for the positive electrode lug (25) and the negative electrode lug (26) to extend out.

7. The flexible battery based on shape memory material according to claim 6, characterized in that, The flexible battery based on shape memory material comprises the shape memory bracket (1) and the battery body (2), the shape memory bracket (1) comprises two mutually parallel and spaced apart deformation plates (11) and a support assembly (12) arranged between the two deformation plates (11), the two deformation plates (11) are connected through the support assembly (12), and the battery body (2) is arranged in parallel between the two deformation plates (11).

8. An electronic product, characterized in that: ​

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