High-specific-energy fully-sealed rectangular lithium ion battery
By designing a fully sealed rectangular structure in a lithium-ion battery and using thermal management technology of the heat storage layer and the adjustment mechanism, the problem of increasing viscosity or solidification of the electrolyte of the lithium-ion battery in a low-temperature environment is solved, and the high specific energy and chemical reaction speed are optimized at different temperatures.
Patent Information
- Application Number
- CN202411499020.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-03-07
AI Technical Summary
In low temperature environments, the viscosity of the electrolyte of lithium-ion batteries increases or solidifies, resulting in slower chemical reaction speed and lower conductivity, affecting the normal use of the battery.
A high-specific energy fully sealed rectangular lithium-ion battery is designed, and a structure including an outer layer, a diaphragm, a heat storage layer, a regulation mechanism, an electrolyte system and a heat insulation mechanism are adopted. Through the heat storage salt and heat sink in the heat storage layer, as well as the thermal conductivity and insulation strips in the adjustment mechanism, the thermal management of the electrolyte system is achieved and the chemical reaction speed is ensured.
In low temperature environments, the heat storage layer and regulation mechanism are designed to effectively store and release heat, maintain high specific energy inside the battery, optimize the chemical reaction speed, and are suitable for different temperature environments.
Smart Images
Figure CN119581745A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of lithium ion batteries, and in particular to a fully sealed rectangular lithium ion battery with high specific energy. Background Art
[0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive electrode and the negative electrode to work. During the charging and discharging process, lithium ions are intercalated and deintercalated back and forth between the two electrodes. When charging, lithium ions are deintercalated from the positive electrode and intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; when discharging, the opposite is true, and lithium ions are deintercalated from the negative electrode and return to the positive electrode through the electrolyte.
[0003] When lithium-ion batteries are used in low temperature environments, the low temperature will cause the viscosity of the electrolyte in the lithium-ion battery to increase, or even partially solidify, resulting in a slower chemical reaction rate and a decrease in conductivity, which directly affects the normal use of the lithium-ion battery. Summary of the invention
[0004] The present invention discloses a high specific energy fully sealed rectangular lithium ion battery, which aims to solve the technical problem that low temperature may cause the viscosity of the electrolyte in the lithium ion battery to increase, or even partially solidify, resulting in a slow chemical reaction rate, a decrease in conductivity, and a direct impact on the normal use of the lithium ion battery.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions:
[0006] A high specific energy fully sealed rectangular lithium ion battery, comprising an outer layer, a diaphragm arranged in the outer layer, a heat storage layer arranged in the diaphragm, a regulating mechanism arranged in the heat storage layer, an electrolyte system arranged in the regulating mechanism, and a heat insulation mechanism arranged at both ends of the electrolyte system;
[0007] The heat storage layer includes a hollow sleeve, heat storage salt filled in the hollow sleeve, a plurality of second heat conductive strips equidistantly arranged inside the hollow sleeve, a second groove arranged on an inner wall of one side of the hollow sleeve, and a heat sink attached to an inner wall of the second groove;
[0008] The adjustment mechanism includes a plurality of first heat-conducting strips, heat-insulating strips staggeredly connected to the plurality of first heat-conducting strips, pull tabs connected to one side of the heat-insulating strips at the top and the bottom, and a dial knob arranged at the top of the pull tabs.
[0009] By providing an adjustment mechanism and a heat storage layer, the first heat-conducting strip can be driven to contact the second heat-conducting strip by moving the knob, so as to construct a heat conduction path between the heat storage layer and the adjustment mechanism. The heat storage layer can store the heat released during the discharge process of the electrolyte system through the internal heat storage salt through heat conduction, and when the air temperature drops, it can be discharged through the heat sink in the second groove to exchange heat with the cold air inside the outer layer, thereby achieving the effect of heat preservation inside the outer layer, ensuring the chemical reaction speed of the lithium-ion battery in a cold air environment, and directly optimizing its high specific energy. Conversely, by moving the knob at the bottom, the heat insulation strip can cover the second heat-conducting strip to seal the heat conduction effect, which is suitable for use in high ambient temperatures, so that the battery has excellent adaptability.
[0010] In a preferred embodiment, the inner wall of the hollow sleeve is equidistantly provided with a plurality of inlay grooves, and a plurality of second heat-conducting strips are correspondingly arranged in the plurality of inlay grooves, the top cover and the bottom end of the outer layer are both penetrated by waist-shaped grooves, the top outer wall of the pull tab is fixedly connected with a second support rod, and the knob is fixed at the top end of the second support rod, the inner walls on the opposite sides of the top cover and the outer layer are respectively provided with a first groove, a bracket is fixedly connected in the first groove, and a support shaft is movably connected to one side of each bracket, one end of the support shaft is fixedly connected to a connecting rod, the top end of the connecting rod is fixedly connected to the first support rod, and a spring is fixedly connected outside the first support rod, and the other end of the spring is connected to the second support rod.
[0011] By providing a connecting rod and a spring, as the second support rod moves in the waist-shaped groove, as the knob translates during the movement, the spring can be stretched during the translation process, and when it moves to one end, the connecting rod is driven to rotate around the support shaft as the axis under the action of the spring, so as to change the spring connection position and reset the spring. Therefore, based on the limiting pulling effect of the spring, the knob can be assisted to quickly move into place when it is moved, and it also plays a self-locking role to ensure the position of the first thermal conductive strip and the thermal insulation strip after adjustment, and ensure the accuracy of the thermal conductive position connection.
[0012] In a preferred embodiment, the top end of the outer layer is fixedly connected to a top cover, and a connecting port is connected to the top cover, the top cover is inlaid with graphene thermal conductive foam, and the top end of the electrolyte system is respectively fitted with thermal conductive silicone sheets, the thermal insulation mechanism is arranged between the thermal conductive silicone sheet and the graphene thermal conductive foam, and the thermal insulation mechanism includes a third support rod, the middle section of the third support rod is fixedly connected to a fixing ring, and the fixing ring is fixedly connected to the outer wall of the second support rod, the same side of the third support rod is fixedly connected to a thermal insulation film, and the other end of the thermal insulation film is fixed to the inner wall of the outer layer, the two ends of the third support rod are respectively connected to sliders, and slide grooves are respectively arranged on the opposite sides of the outer layer, and the sliders are movably connected in the slide grooves.
[0013] By providing a heat insulation mechanism, when the knob at the top is turned to drive the second support rod at the top to move horizontally, the heat insulation film between the graphene thermally conductive foam and the thermally conductive silicone sheet at the top can be driven to flatten under the limiting effect of the slide groove on the slider and the connecting effect of the third support rod. Therefore, when the knob at the top is turned to make the first thermally conductive strip and the second thermally conductive strip contact, the heat conduction efficiency between the graphene thermally conductive foam and the thermally conductive silicone sheet is simultaneously weakened, which can further optimize the heat preservation effect in the battery and ensure the high specific energy of the battery.
[0014] As can be seen from the above, a high specific energy fully sealed rectangular lithium ion battery includes an outer layer, a diaphragm arranged in the outer layer, a heat storage layer arranged in the diaphragm, an adjustment mechanism arranged in the heat storage layer, an electrolyte system arranged in the adjustment mechanism, and a heat insulation mechanism arranged at both ends of the electrolyte system; the heat storage layer includes a hollow sleeve, heat storage salt filled in the hollow sleeve, a plurality of second heat conductive strips equidistantly arranged inside the hollow sleeve, a second groove arranged on the inner wall of one side of the hollow sleeve, and a heat sink attached to the inner wall of the second groove; the adjustment mechanism includes a plurality of first heat conductive strips, heat insulation strips staggeredly connected with the plurality of first heat conductive strips, a pull tab connected to one side of the heat insulation strip at the top and the bottom, and a dial knob arranged at the top of the pull tab. The high specific energy fully sealed rectangular lithium ion battery provided by the present invention has the function of ensuring the chemical reaction speed of the lithium ion battery in a cold air environment and directly optimizing its technical effect of high specific energy. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the overall structure of a high specific energy fully sealed rectangular lithium-ion battery proposed by the present invention.
[0016] Figure 2 This is a schematic diagram of the internal structure of a high specific energy fully sealed rectangular lithium-ion battery proposed by the present invention.
[0017] Figure 3 This is a schematic diagram of the top split of a high specific energy fully sealed rectangular lithium-ion battery proposed by the present invention.
[0018] Figure 4 This is a schematic diagram of the splitting of the heat storage layer of a high specific energy fully sealed rectangular lithium-ion battery proposed by the present invention.
[0019] Figure 5 This is a cross-sectional view of the heat storage layer of a high specific energy fully sealed rectangular lithium-ion battery proposed by the present invention.
[0020] In the figure: 1. outer layer; 2. connection port; 3. graphene thermal foam; 4. adjustment mechanism; 5. top cover; 6. diaphragm; 7. heat storage layer; 8. first groove; 9. thermal insulation mechanism; 10. thermal conductive silicone sheet; 11. electrolyte system; 401. dial knob; 402. waist-shaped groove; 403. first thermal strip; 404. thermal insulation strip; 405. pull tab; 406. first support rod; 407. connecting rod; 408. support shaft; 409. spring; 410. second support rod; 411. bracket; 701. hollow sleeve; 702. inlay groove; 703. second thermal strip; 704. heat sink; 705. second groove; 706. thermal storage salt; 901. thermal insulation film; 902. slider; 903. slide groove; 904. fixing ring; 905. third support rod. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0022] The invention discloses a fully sealed rectangular lithium-ion battery with high specific energy, which is mainly used in the scenario where the lithium-ion battery is used in a low-temperature environment.
[0023] Reference Figure 1-Figure 5 , a high specific energy fully sealed rectangular lithium ion battery, comprising an outer layer 1, a diaphragm 6 arranged in the outer layer 1, a heat storage layer 7 arranged in the diaphragm 6, a regulating mechanism 4 arranged in the heat storage layer 7, an electrolyte system 11 arranged in the regulating mechanism 4 and a heat insulation mechanism 9 arranged at both ends of the electrolyte system 11;
[0024] The heat storage layer 7 includes a hollow sleeve 701, a heat storage salt 706 filled in the hollow sleeve 701, a plurality of second heat conducting strips 703 equidistantly arranged on the inner side of the hollow sleeve 701, a second groove 705 arranged on the inner wall of one side of the hollow sleeve 701, and a heat sink 704 attached to the inner wall of the second groove 705;
[0025] The regulating mechanism 4 includes a plurality of first heat-conducting strips 403, heat-insulating strips 404 interlaced with the plurality of first heat-conducting strips 403, a pull-tab 405 connected to one side of the heat-insulating strips 404 at the top and the bottom, and a dial 401 arranged at the top of the pull-tab 405. By moving the dial 401, the first heat-conducting strips 403 can be driven to contact the second heat-conducting strips 703, so as to construct a heat-conducting path between the heat storage layer 4 and the regulating mechanism 4. Synchronously, through heat conduction, the heat storage layer 7 can release the electrolyte system 11 through the internal heat storage salt 706. The heat released during the electrical process is stored and discharged through the heat sink 704 in the second groove 705 when the air temperature drops, and heat is exchanged with the cold air inside the outer layer 1, thereby achieving the effect of heat preservation inside the outer layer 1, ensuring the chemical reaction speed of the lithium-ion battery in the cold air environment, and directly optimizing its high specific energy. Conversely, moving the knob 401 at the bottom so that the insulation strip 404 covers the second thermal conductive strip 703 can seal the thermal conductive effect, which is suitable for use in high ambient temperatures, making the battery have excellent adaptability.
[0026] Reference Figure 2-Figure 4 In a preferred embodiment, the inner wall of the hollow sleeve 701 is equidistantly provided with a plurality of inlay grooves 702, and a plurality of second heat-conducting strips 703 are correspondingly arranged in the plurality of inlay grooves 702, and waist-shaped grooves 402 are simultaneously penetrated through the bottom ends of the top cover 5 and the outer layer 1.
[0027] Reference Figure 2 and Figure 3 In a preferred embodiment, the top outer wall of the pull tab 405 is fixedly connected to the second support rod 410, and the knob 401 is fixed to the top of the second support rod 410, and the top cover 5 and the inner wall on the opposite side of the outer layer 1 are respectively provided with a first groove 8.
[0028] Reference Figure 2 and Figure 3 In a preferred embodiment, a bracket 411 is fixedly connected in the first groove 8, and a support shaft 408 is movably connected to one side of each bracket 411, and a connecting rod 407 is fixedly connected to one end of the support shaft 408.
[0029] Reference Figure 2 and Figure 3In a preferred embodiment, the top of the connecting rod 407 is fixedly connected to the first support rod 406, and the first support rod 406 is fixedly connected to the outside of the spring 409, and the other end of the spring 409 is connected to the second support rod 410. As the second support rod 410 moves in the waist-shaped groove 402, during the movement, as the knob 401 translates, the spring 409 can be stretched during the translation, and when it moves to one end, the connecting rod 407 is driven to rotate around the support shaft 408 as the axis under the action of the spring 409, changing the connection position of the spring 409 and resetting the spring 409. Therefore, based on the limiting pulling effect of the spring 409, when the knob 401 is moved, the knob 401 can be assisted to quickly get into place, and it also plays a self-locking role to ensure the adjusted positions of the first thermal conductive strip 403 and the thermal insulation strip 404, and ensure the accuracy of the thermal conductive position connection.
[0030] Reference Figure 1 and Figure 2 In a preferred embodiment, the top of the outer layer 1 is fixedly connected to a top cover 5, and the top cover 5 is connected to a connection port 2, the top cover 5 is inlaid with graphene thermal conductive foam 3, and the top of the electrolyte system 11 is respectively fitted with a thermal conductive silicone sheet 10.
[0031] Reference Figure 2 and Figure 3 In a preferred embodiment, the heat insulation mechanism 9 is arranged between the thermally conductive silicone sheet 10 and the graphene thermally conductive foam 3, and the heat insulation mechanism 9 includes a third support rod 905, the middle section of the third support rod 905 is fixedly connected to a fixing ring 904, and the fixing ring 904 is fixedly connected to the outer wall of the second support rod 410.
[0032] Reference Figure 3 In a preferred embodiment, a heat-insulating film 901 is fixedly connected to the same side of the third support rod 905, and the other end of the heat-insulating film 901 is fixed to the inner wall of the outer layer 1, and sliders 902 are respectively connected to the two ends of the third support rod 905, and slide grooves 903 are respectively provided on the opposite sides of the outer layer 1, and the sliders 902 are movably connected in the slide grooves 903. When the dial knob 401 at the top drives the second support rod 410 at the top to translate, the slide groove 903 limits the slider 902 and the third support rod 905. The heat-insulating film 901 between the top graphene thermally conductive foam 3 and the thermally conductive silicone sheet 10 can be flattened under the limiting effect of the slide groove 903 on the slider 902 and the connection effect of the third support rod 905, so that when the dial knob 401 at the top is turned to make the first thermally conductive strip 403 and the second thermally conductive strip 703 contact, the thermal conductivity between the graphene thermally conductive foam 3 and the thermally conductive silicone sheet 10 is simultaneously weakened, which can further optimize the thermal insulation effect in the battery and ensure the high specific energy of the battery.
[0033] Working principle: By moving the knob 401, the first heat-conducting strip 403 can be driven to contact the second heat-conducting strip 703, so as to construct a heat-conducting path between the heat storage layer 4 and the regulating mechanism 4. Through heat conduction, the heat storage layer 7 can store the heat released during the discharge of the electrolyte system 11 through the internal heat storage salt 706, and when the air temperature drops, it is discharged through the heat sink 704 in the second groove 705 to exchange heat with the cold air inside the outer layer 1, thereby achieving the effect of heat preservation inside the outer layer 1, ensuring the chemical reaction speed of the lithium-ion battery in the cold air environment, and directly optimizing its high specific energy. Conversely, by moving the knob 401 at the bottom, the heat-insulating strip 404 can cover the second heat-conducting strip 703 to seal the heat-conducting effect, which is suitable for use in high ambient temperatures, so that the battery has excellent adaptability. As the knob 401 is translated, the spring 409 can be driven to stretch during the translation process, and when it moves to one end, the connecting rod 40 is driven under the action of the spring 409. 7 is rotated around the support shaft 408 to change the connection position of the spring 409 and reset the spring 409. Therefore, based on the limiting pulling effect of the spring 409, when the dial knob 401 is moved, the dial knob 401 can be assisted to quickly move into position, and it also plays a self-locking role to ensure the adjusted positions of the first heat-conducting strip 403 and the heat-insulating strip 404, and ensure the accuracy of the heat-conducting position connection. When the dial knob 401 at the top drives the second support rod 410 at the top to move horizontally, under the limiting effect of the slide groove 903 on the slider 902 and the connection effect of the third support rod 905, the heat-insulating film 901 between the top graphene heat-conducting foam 3 and the heat-conducting silicone sheet 10 can be driven to flatten, so that when the dial knob 401 at the top is driven to make the first heat-conducting strip 403 and the second heat-conducting strip 703 contact, the heat-conducting efficiency between the graphene heat-conducting foam 3 and the heat-conducting silicone sheet 10 is simultaneously weakened, which can further optimize the heat preservation effect in the battery and ensure the high specific energy of the battery.
[0034] 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 according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A fully sealed rectangular lithium-ion battery with high specific energy, characterized in that: It comprises an outer layer (1), a diaphragm (6) arranged in the outer layer (1), a heat storage layer (7) arranged in the diaphragm (6), a regulating mechanism (4) arranged in the heat storage layer (7), an electrolyte system (11) arranged in the regulating mechanism (4), and heat insulation mechanisms (9) arranged at both ends of the electrolyte system (11); The heat storage layer (7) comprises a hollow sleeve (701), heat storage salt (706) filled in the hollow sleeve (701), a plurality of second heat conducting strips (703) equidistantly arranged on the inner side of the hollow sleeve (701), a second groove (705) arranged on the inner wall of one side of the hollow sleeve (701), and a heat sink (704) attached to the inner wall of the second groove (705); The adjustment mechanism (4) comprises a plurality of first heat-conducting strips (403), heat-insulating strips (404) connected in an alternating manner to the plurality of first heat-conducting strips (403), pull tabs (405) connected to one side of the heat-insulating strips (404) at the top and bottom ends, and a dial knob (401) arranged at the top end of the pull tab (405).
2. A high specific energy fully sealed rectangular lithium ion battery according to claim 1, characterized in that: The inner wall of the hollow sleeve (701) is provided with a plurality of inlay grooves (702) at equal intervals, and a plurality of second heat-conducting strips (703) are correspondingly arranged in the plurality of inlay grooves (702), and waist-shaped grooves (402) are simultaneously penetrated through the bottom ends of the top cover (5) and the outer layer (1).
3. A high specific energy fully sealed rectangular lithium ion battery according to claim 2, characterized in that: The top outer wall of the pull tab (405) is fixedly connected to a second support rod (410), and the knob (401) is fixed to the top of the second support rod (410). The top cover (5) and the inner wall on the opposite side of the outer layer (1) are respectively provided with a first groove (8).
4. A high specific energy fully sealed rectangular lithium ion battery according to claim 3, characterized in that: A bracket (411) is fixedly connected in the first groove (8), and one side of each bracket (411) is movably connected to a support shaft (408), and one end of the support shaft (408) is fixedly connected to a connecting rod (407).
5. A high specific energy fully sealed rectangular lithium ion battery according to claim 4, characterized in that: The top end of the connecting rod (407) is fixedly connected to the first supporting rod (406), and the outside of the first supporting rod (406) is fixedly connected to a spring (409), and the other end of the spring (409) is connected to the second supporting rod (410).
6. A high specific energy fully sealed rectangular lithium ion battery according to claim 1, characterized in that: The top end of the outer layer (1) is fixedly connected to a top cover (5), and the top cover (5) is connected to a connection port (2), the top cover (5) is inlaid with graphene thermal conductive foam (3), and the top end of the electrolyte system (11) is respectively fitted with a thermal conductive silicone sheet (10).
7. A high specific energy fully sealed rectangular lithium ion battery according to claim 6, characterized in that: The heat insulating mechanism (9) is arranged between the heat conductive silicone sheet (10) and the graphene heat conductive foam (3), and the heat insulating mechanism (9) comprises a third support rod (905), a middle section of the third support rod (905) is fixedly connected to a fixing ring (904), and the fixing ring (904) is fixedly connected to the outer wall of the second support rod (410).
8. A high specific energy fully sealed rectangular lithium ion battery according to claim 7, characterized in that: The same side of the third support rod (905) is fixedly connected to a heat insulation film (901), and the other end of the heat insulation film (901) is fixed to the inner wall of the outer layer (1). The two ends of the third support rod (905) are respectively connected to sliders (902), and the outer layer (1) is respectively provided with slide grooves (903) on the opposite sides, and the slider (902) is movably connected in the slide groove (903).