A novel solid-state battery structure

Abstract

This invention discloses a novel solid-state battery structure, comprising: a first housing; a second housing located opposite the first housing, the second housing and the first housing being fixedly connected by a fastener to form a sealed structure; wherein, a groove is provided inside the second housing, and an opening is provided on one side of the second housing, the opening communicating with the groove; a positive electrode tab and a negative electrode tab, both located within the groove; an electrolyte located between the positive electrode tab and the negative electrode tab; the electrolyte being fabricated by a solution preparation method; a long-period fiber grating located between the positive electrode tab and the electrolyte, and / or between the electrolyte and the negative electrode tab, and connected to an external device through the opening; wherein, the long-period fiber grating is fabricated by periodically heating, softening, and stretching a single-mode fiber grating. The novel solid-state battery structure provided by this invention has advantages such as simple design structure, small size, and high temperature monitoring sensitivity.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, specifically relating to a novel solid-state battery structure. Background Technology

[0002] As a power source, the performance of batteries is of great significance to the safety and future development of products. Therefore, it is crucial to achieve real-time online monitoring of battery operating status.

[0003] Temperature is a critical parameter for battery monitoring, as it improves safety and long-term cycle stability. High local current density can lead to significant heat release, electrolyte decomposition, gas release, and even battery explosion—a phenomenon known as thermal runaway. Therefore, monitoring battery temperature is extremely important. Currently, most batteries use liquid or gel-like electrolytes, whose corrosiveness significantly impacts battery performance, resulting in poor stability and unreliable temperature monitoring. Consequently, solid-state batteries are gaining popularity.

[0004] However, the solid electrolyte manufacturing process used in existing solid-state batteries is complex, increasing manufacturing costs. Furthermore, most existing solid-state batteries only monitor the surface temperature of the battery, lacking real-time online monitoring of the internal temperature. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a novel solid-state battery structure.

[0006] The technical problem to be solved by this invention is achieved through the following technical solution:

[0007] This invention provides a novel solid-state battery structure, comprising:

[0008] First shell;

[0009] The second housing is located opposite the first housing, and the second housing and the first housing are fixedly connected by a fastener to form a sealed structure; wherein, the second housing is provided with a groove, and one side of the second housing is provided with an opening that communicates with the groove;

[0010] Both the positive electrode tab and the negative electrode tab are located within the groove;

[0011] An electrolyte is located between the positive electrode earpiece and the negative electrode earpiece; the electrolyte is prepared by solution preparation.

[0012] A long-period fiber grating is located between the positive electrode tab and the electrolyte, and / or between the electrolyte and the negative electrode tab, and is connected to an external device through the opening; wherein the long-period fiber grating is fabricated by periodically heating, softening and stretching a single-mode fiber grating.

[0013] In one embodiment of the present invention, the first housing, the second housing, and the fastener are all made of high-temperature resistant materials.

[0014] In one embodiment of the present invention, both the positive electrode ear piece and the negative electrode ear piece are lithium sheets.

[0015] In one embodiment of the present invention, the positive electrode earpiece, the negative electrode earpiece, and the electrolyte are all the same size and shape.

[0016] In one embodiment of the present invention, the shape of the groove is the same as the shape of the positive electrode ear piece, the negative electrode ear piece, and the electrolyte.

[0017] In one embodiment of the present invention, the materials used in the solution preparation process include polyvinylidene fluoride, acetone, N,N-dimethylformamide, and lithium salt; the process of preparing the electrolyte by solution preparation includes:

[0018] The polyvinylidene fluoride, acetone, and N,N-dimethylformamide are stirred and mixed.

[0019] The lithium salt is stirred and mixed with the solution after the first stirring and mixing.

[0020] The solution after the second stirring and mixing is then heated;

[0021] The heated solution is cooled and cut to form the electrolyte.

[0022] In one embodiment of the present invention, the long-period fiber grating is fabricated by periodically heating, softening, and stretching a single-mode fiber grating, comprising:

[0023] Remove the coating layer from the single-mode fiber grating;

[0024] Simultaneously heat and soften the upper and lower opposing surfaces of the current heating and softening position of the single-mode fiber grating;

[0025] Both ends of the single-mode fiber grating in the heated and softened section are stretched simultaneously by a preset moving distance and moving time;

[0026] The next heating and softening position is determined periodically, and the determined heating and softening position is heated, softened, and stretched to form the long-period fiber grating.

[0027] In one embodiment of the present invention, the single-mode fiber grating at each heated and softened location is stretched into a dumbbell-shaped structure that is thinner in the middle and thicker at both ends.

[0028] In one embodiment of the present invention, the diameter of the single-mode fiber grating in the middle of each dumbbell-shaped structure is 4 / 5 of the diameter of the original single-mode fiber grating.

[0029] In one embodiment of the present invention, a capillary glass tube is further included, which is wrapped around the long-period fiber grating.

[0030] The beneficial effects of this invention are:

[0031] The novel solid-state battery structure provided by this invention has advantages such as simple design, small size, and high temperature monitoring sensitivity. Specifically, in the solid-state battery structure: the electrolyte used in this invention is prepared by solution preparation, which is simpler than existing electrolyte manufacturing processes and produces a smaller electrolyte, thereby reducing the overall size of the solid-state battery structure and enabling its wider application in the battery field; at the same time, this invention also incorporates a long-period fiber grating in the solid-state battery structure. Utilizing the temperature sensitivity of the long-period fiber grating, the temperature monitoring sensitivity of the solid-state battery can be improved, enabling real-time online monitoring of the battery's internal temperature.

[0032] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a novel solid-state battery structure provided in an embodiment of the present invention;

[0034] Figure 2 (a) to 2(c) are schematic diagrams of the long-period fiber grating position design in a novel solid-state battery structure provided by an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of an electrolyte preparation process provided in an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the fabrication process of a long-period grating optical fiber provided in an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the structure of a long-period grating optical fiber provided in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the structure of a long-period grating fiber prepared in an experiment according to an embodiment of the present invention;

[0039] Figure 7This is a schematic diagram of another novel solid-state battery structure provided in an embodiment of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1-First housing; 2-Second housing; 3-Groove; 4-Opening; 5-Fixing component; 6-Negative electrode ear; 7-Positive electrode ear; 8-Electrolyte; 9-Long-period fiber grating; 10-Capillary glass tube. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0043] To achieve real-time online monitoring of the internal temperature of solid-state batteries, please refer to [link / reference needed]. Figure 1 This invention provides a novel solid-state battery structure, comprising:

[0044] First shell 1;

[0045] The second housing 2 is located on the opposite side of the first housing 1. The second housing 2 and the first housing 1 are fixedly connected by the fastener 5 to form a sealed structure. The second housing 2 has a groove 3 inside and an opening 4 on one side, which communicates with the groove 3.

[0046] Both the positive electrode ear piece 7 and the negative electrode ear piece 6 are located within the groove 3;

[0047] Electrolyte 8 is located between positive electrode ear piece 7 and negative electrode ear piece 6; electrolyte 8 is prepared by solution preparation.

[0048] The long-period fiber grating 9 is located between the positive electrode lug 7 and the electrolyte 8, and / or between the electrolyte 8 and the negative electrode lug 6, and is connected to an external device through the opening 4; wherein, the long-period fiber grating 9 is manufactured by periodically heating, softening and stretching a single-mode fiber grating.

[0049] The first housing 1, the second housing 2, and the fastener 5 mentioned above are all made of high-temperature resistant materials, such as high-temperature resistant plastics, high-temperature resistant metals, and high-temperature resistant ceramics. High-temperature resistant plastics are preferred, which can save on process costs.

[0050] The second housing 2 described above is provided with a groove 3 for placing the positive electrode ear piece 7 and the negative electrode ear piece 6, as well as the electrolyte 8 located between the positive electrode ear piece 7 and the negative electrode ear piece 6, such as... Figure 1The groove 3 shown can be located at the center of the second housing 2. The shape of the groove 3 is the same as that of the positive electrode lug 7, the negative electrode lug 6, and the electrolyte 8. The positive electrode lug 7, the negative electrode lug 6, and the electrolyte 8 are all the same size and shape. The positive electrode lug 7 and the negative electrode lug 6 can both be lithium sheets. The size of the groove 3 is slightly larger than that of the electrolyte 8. For example, if the electrolyte 8 is a circular structure with a diameter of 2 cm, then the groove 3 is a circular structure with a diameter of 2.1 cm.

[0051] It should be noted that the groove 3 is not limited to the second housing 2. The first housing 1 and / or the second housing 2 can both be provided with the groove 3. As long as the positive electrode ear 7, the negative electrode ear 6 and the electrolyte 8 can be placed in such a groove 3 structure when forming a sealing structure.

[0052] The second housing 2 described above also has an opening 4 on one side, such as... Figure 1 The opening 4, as shown, communicates with the groove 3, and is used to connect the long-period fiber grating 9, which is embedded between the positive electrode tab 7 and the electrolyte 8, and / or located between the electrolyte 8 and the negative electrode tab 6, to an external device through the opening 4. Utilizing the temperature-sensitive principle of the long-period fiber grating 9, the internal temperature of the battery can be monitored in real time. Please refer to... Figure 2 (a)~ Figure 2 (c) The embodiments of the present invention provide three optional solutions. Figure 2 (a)~ Figure 2 (c) Both can achieve real-time online monitoring of the battery's internal temperature. Figure 2 (c) To achieve monitoring of two local temperatures, and to verify the reliability of battery internal temperature monitoring by comparing the two local temperatures.

[0053] It should be noted that the opening 4 is not limited to the second housing 2. The first housing 1 and / or the second housing 2 can both be provided with the opening 4. As long as the sealed structure is formed, the long-period fiber grating 9 can be connected to external devices through the opening 4 to realize real-time online monitoring of the internal temperature of the battery.

[0054] In this embodiment of the invention, the method of fixing the first housing 1, the second housing 2, and the fixing member 5 is not limited, as long as the first housing 1 and the second housing 2 are fixedly connected to form a sealed structure. For example, the fixing member 5 can be a screw with a threaded structure, and the corresponding first housing 1 and the second housing 2 are designed with threaded through holes. The screw fixes the first housing 1 and the second housing 2 to form a sealed structure through a threaded connection. Alternatively, the fixing member 5 can be a nut with a threaded structure and a screw with a threaded structure, and the corresponding first housing 1 and the second housing 2 are designed with through holes. The nut fixes the first housing 1 and the second housing 2 to form a sealed structure through a threaded connection with the screw.

[0055] To address the issues of complex and costly solid electrolyte fabrication processes used in existing solid-state batteries, this invention provides a solution-based electrolyte fabrication method. The choice of materials used in this method is crucial, as inappropriate materials can negatively impact the electrolyte's power supply performance during battery operation. The inventors have discovered that when polyvinylidene fluoride, acetone, N,N-dimethylformamide, and lithium salt are used in the solution-based fabrication process, the resulting electrolyte can effectively supply power during battery operation. For the process of fabricating electrolyte 8 using the solution-based method in this invention, please refer to [link to relevant documentation]. Figure 3 Specifically, it includes:

[0056] S301. Mix polyvinylidene fluoride, acetone and N,N-dimethylformamide by stirring.

[0057] S302. Mix the lithium salt with the solution after the first stirring and mixing.

[0058] S303. Heat the solution after the second stirring and mixing;

[0059] S304, Cool the heated solution and cut it to form electrolyte 8.

[0060] In the manufacturing process, this embodiment of the invention provides an feasible solution, including: first, taking 0.6g to 0.8g of polyvinylidene fluoride, 4ml to 6ml of acetone, and 1ml to 2ml of N,N-dimethylformamide, placing them on a stirrer, and stirring and mixing at a speed of 800 to 1000 rpm for 0.4h to 0.6h; after the first stirring and mixing is completed, adding 1g to 1.2g of lithium salt, and stirring and mixing again at the same stirring and mixing speed for 0.4h to 0.6h; after the solution becomes transparent, pouring it into a mold, and heating it on a heating platform at a heating temperature of 60℃ to 70℃ for 0.8h to 1h; after heating is completed, cooling and removing the solution to cut it into electrolyte 8. For example, this embodiment of the invention can produce a circular electrolyte 8 with a diameter of 0.5cm to 1.5cm and a thickness of 0.15mm to 0.2mm for battery assembly. During the production of electrolyte 8, the inventors discovered that the materials used, the amount of each material used, and the control of time and temperature during the production process are very important to the production of electrolyte 8. The above-mentioned feasible solution is a feasible solution that the inventors have developed through continuous experiments based on the idea of ​​producing electrolyte 8 by means of solution preparation.

[0061] To address the issue that most existing solid-state batteries only monitor the surface temperature and lack real-time online monitoring of the internal temperature, this invention proposes a scheme to embed a long-period fiber grating 9 into the aforementioned solid-state battery structure. The long-period fiber grating 9 is fabricated by periodically heating, softening, and stretching a single-mode fiber grating. Please refer to [link to previous document]. Figure 4 Specifically, it includes:

[0062] S401, Remove the coating layer of the single-mode fiber grating;

[0063] S402. Simultaneously heat and soften the upper and lower opposing surfaces of the current heating and softening position of the single-mode fiber grating;

[0064] S403. The two ends of the single-mode fiber grating in the heated and softened part are stretched simultaneously by a preset moving distance and moving time.

[0065] S404. Periodically determine the next heating and softening position, and heat and soften and stretch each determined heating and softening position to form a long-period fiber grating 9.

[0066] Formed by S401 to S404 Figure 5 The long-period fiber grating 9 shown is used for battery assembly. Please refer to [link / reference]. Figure 5 Each single-mode fiber grating at the heat-softening position is stretched into a dumbbell-shaped structure that is thinner in the middle and thicker at both ends. The diameter d2 of the single-mode fiber grating in the middle of each dumbbell-shaped structure is 4 / 5 of the original single-mode fiber grating diameter d1. The distance between adjacent heat-softening positions is d3.

[0067] In the fabrication process, this embodiment of the invention provides an feasible solution. The equipment for fabricating long-period fiber gratings 9 includes a pair of fiber grating fixtures, two high-precision displacement stages, and a CO2 laser. The specific operation steps include:

[0068] The coating of the original single-mode fiber grating is removed. The two ends of the single-mode fiber grating are fixed to a pair of fiber clamps on a high-precision displacement stage. A CO2 laser is used to heat the single-mode fiber grating, specifically by simultaneously heating and softening the upper and lower opposing surfaces of the single-mode fiber grating to ensure uniform softening. The output power of the CO2 laser is controlled at 6W–8W, and the heating time is controlled at 800ms–1000ms. After heating, the softened portion is... Both ends of the single-mode fiber are stretched simultaneously. During the stretching process, the moving distance and time of two high-precision displacement stages are controlled to ensure that a dumbbell-shaped structure is formed at the heating and softening location, and to ensure that the single-mode fiber grating is stretched uniformly. This ensures that the diameter d2 of the single-mode fiber grating in the middle of the dumbbell-shaped structure is 4 / 5 of the original single-mode fiber grating diameter d1. For example, if the diameter d1 of the original single-mode fiber grating is 125 μm, then the diameter d2 of the single-mode fiber grating in the middle of the dumbbell-shaped structure is 100 μm, forming a structure like... Figure 6 The structure of a partial long-period fiber grating 9 is shown. The next heating and softening position is periodically determined, and the original single-mode fiber grating is subjected to the above heating, softening, and stretching treatment at each determined heating and softening position to form the long-period fiber grating 9. The periodic determination of the next heating and softening position is based on the distance between adjacent heating and softening positions and the start time of the heating and softening treatment, and multiple determined heating, softening, and stretching positions on the original single-mode fiber grating are sequentially heated, softened, and stretched. During the fabrication process, the high-precision displacement stage moves the same distance and time interval at each determined heating and softening position, achieving uniform and periodic heating, softening, and stretching of the single-mode fiber grating. The movement distance of the high-precision displacement stage each time is one grating period.

[0069] Based on the feasible solutions proposed above, a product can be manufactured as follows: Figure 6 The long-period fiber grating 9 shown in the figure has the following parameters: 125 represents the diameter d1 of the original single-mode fiber grating, 100 represents the diameter d2 of the stretched single-mode fiber grating in the middle, and 400 represents the distance d3 between adjacent heat-softening positions, i.e., the required movement distance of the high-precision moving stage corresponding to the determined next heat-softening position. During the entire fabrication process, the stretching control at each heat-softening position is particularly important. In this embodiment of the invention, the movement distance and time of two high-precision moving stages are controlled during the stretching process to ensure that a dumbbell-shaped structure is formed at each heat-softening position, and the diameter d2 of the single-mode fiber grating in the middle of the dumbbell-shaped structure is always 4 / 5 of the diameter d1 of the original single-mode fiber grating. The movement distance and time of the high-precision moving stages are pre-calculated based on the characteristics of the original single-mode fiber grating, and the original single-mode fiber grating is stretched according to the calculated movement distance and time during the stretching process.

[0070] To further ensure real-time online monitoring of the internal temperature of solid-state batteries, embodiments of the present invention provide an optional solution, such as... Figure 7 As shown, this novel solid-state battery also includes a capillary glass tube 10, which is wrapped around a long-period fiber Bragg grating 9. Since the long-period fiber Bragg grating 9 is embedded between the positive electrode lug 7 and the electrolyte 8, and / or located between the electrolyte 8 and the negative electrode lug 6, improper control during battery packaging can easily cause it to be squeezed, resulting in deformation and affecting the accuracy of temperature measurement. Therefore, in this embodiment of the invention, while embedding the long-period fiber Bragg grating 9, a capillary glass tube 10 can be fitted onto it. The capillary glass tube 10 protects the long-period fiber Bragg grating 9 from deformation, ensuring the temperature measurement accuracy of the long-period fiber Bragg grating 9.

[0071] This invention provides an optional assembly scheme for a novel solid-state battery structure. The assembly process includes: first, forming an electrolyte 8 through steps S301-S304, and forming a long-period fiber grating 9 through steps S401-S404; then, sequentially placing a positive electrode tab 7, the long-period fiber grating 9, the electrolyte 8, and a negative electrode tab 6 in the groove 3 of the second housing 2, wherein the long-period fiber grating 9 is placed at the center between the positive electrode tab 7 and the electrolyte 8, and the long-period fiber grating 9 is also connected to an external device for monitoring the internal temperature of the battery through the opening 4 of the second housing 2; finally, fixing the first housing 1 and the second housing 2 with threaded screws to form a sealed structure, thus completing the assembly.

[0072] In summary, the novel solid-state battery structure provided by this invention has advantages such as simple design, small size, and high temperature monitoring sensitivity. Specifically, in the solid-state battery structure: the electrolyte 8 used in this invention is manufactured by solution preparation, which is simpler than existing electrolyte manufacturing processes and produces a smaller electrolyte 8, thereby reducing the overall volume of the solid-state battery structure and enabling it to have broader application prospects in the battery field; at the same time, this invention also incorporates a long-period fiber grating 9 in the solid-state battery structure. Utilizing the temperature sensitivity of the long-period fiber grating 9, the temperature monitoring sensitivity of the solid-state battery can be improved, enabling real-time online monitoring of the battery's internal temperature.

[0073] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0074] In the description of the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0076] Although this application has been described herein in conjunction with various embodiments, other variations of the disclosed embodiments can be understood and implemented by those skilled in the art in carrying out the claimed application by reviewing the accompanying drawings, the disclosure, and the appended claims.

[0077] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A solid-state battery structure, characterized in that, include: First shell; The second housing is located opposite the first housing, and the second housing and the first housing are fixedly connected by a fastener to form a sealed structure; wherein, the second housing is provided with a groove, and one side of the second housing is provided with an opening that communicates with the groove; Both the positive electrode and the negative electrode are located within the groove in the sealed structure; both the positive electrode and the negative electrode are lithium sheets. An electrolyte is located between the positive and negative electrodes. The electrolyte is prepared by solution preparation. The materials used in the solution preparation process include polyvinylidene fluoride, acetone, N,N-dimethylformamide, and lithium salt. The process of preparing the electrolyte by solution preparation includes: taking 0.6g~0.8g of polyvinylidene fluoride, 4ml~6ml of acetone, and 1ml~2ml of N,N-dimethylformamide, placing them on a stirrer, and stirring and mixing at a speed of 800~1000 rpm for 0.4h~0.6h; after the first stirring and mixing is completed, adding 1g~1.2g of lithium salt, and stirring and mixing again at the same stirring speed for 0.4h~0.6h; after the solution becomes transparent, pouring it into a mold, and heating it on a heating plate at a temperature of 60℃~70℃ for 0.8h~1h; after heating, cooling and cutting to form the electrolyte. A long-period fiber grating is located between the positive electrode and the electrolyte, and / or between the electrolyte and the negative electrode, and is connected to an external device through the opening; wherein the long-period fiber grating is fabricated by periodically heating, softening, and stretching a single-mode fiber grating; A capillary glass tube, which is wrapped around the long-period fiber grating.

2. The solid-state battery structure according to claim 1, characterized in that, The first housing, the second housing, and the fastener are all made of high-temperature resistant materials.

3. The solid-state battery structure according to claim 1, characterized in that, The positive electrode, the negative electrode, and the electrolyte are all the same size and shape.

4. The solid-state battery structure according to claim 1, characterized in that, The shape of the groove is the same as that of the positive electrode, the negative electrode, and the electrolyte.

5. The solid-state battery structure according to claim 1, characterized in that, The long-period fiber grating is fabricated by periodically heating, softening, and stretching a single-mode fiber grating, including: Remove the coating layer from the single-mode fiber grating; Simultaneously heat and soften the upper and lower opposing surfaces of the current heating and softening position of the single-mode fiber grating; Both ends of the single-mode fiber grating in the heated and softened section are stretched simultaneously by a preset moving distance and moving time; The next heating and softening position is determined periodically, and the determined heating and softening position is heated, softened, and stretched to form the long-period fiber grating.

6. The solid-state battery structure according to claim 5, characterized in that, Each single-mode fiber grating at the heated and softened location, after stretching, takes on a dumbbell shape that is thinner in the middle and thicker at both ends.

7. The solid-state battery structure according to claim 6, characterized in that, The diameter of the single-mode fiber grating in the middle of each dumbbell-shaped structure is 4 / 5 of the diameter of the original single-mode fiber grating.

Images