Packaging shell of solid-state lithium battery
By using fiberglass and ceramic materials to make the inner and outer shells of solid-state lithium batteries and filling the inner shells with liquid coolant, the thermal expansion problem of solid-state lithium batteries is solved, improving the battery's charge and discharge performance and lifespan, while reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-03-03
AI Technical Summary
Existing solid-state lithium batteries experience reduced contact between the electrolyte and electrodes during thermal expansion, leading to decreased charge and discharge performance. Furthermore, titanium alloy casings are costly and difficult to process.
The inner and outer shells are made of fiberglass and ceramic materials. The inner shell is filled with liquid coolant, and the outer shell is fixed by welding or bonding to ensure the stability of the battery shape and sealing, thereby reducing costs.
It effectively maintains the shape of the battery, improves battery performance, reduces costs, enhances heat resistance and sealing, and extends service life.
Smart Images
Figure CN223967309U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery technology, and in particular to a packaging shell for a solid-state lithium battery. Background Technology
[0002] The electrolyte in a solid-state lithium battery is not a liquid but a solid material. When heated, the solid electrolyte undergoes thermal expansion, causing the shape of the solid-state lithium battery to change. This change in shape affects the effective contact between the solid electrolyte and the battery electrodes, thereby reducing the battery's charge and discharge capabilities. The contact between the solid electrolyte and the electrodes is similar to that between two solids. When the contact between the solid electrolyte and the electrodes is tight and sufficient, the ions between the electrodes can be effectively transferred through the electrolyte. However, if the electrolyte and the electrodes cannot make effective contact, the effective contact area will be reduced, which will decrease the battery's charge and discharge performance.
[0003] Therefore, current solid-state lithium batteries use titanium alloys as the external encapsulation material to fix and maintain the shape of the solid-state lithium battery. However, titanium alloys are a difficult metal to process, and the smelting technology and operating environment are very harsh, requiring high temperature and vacuum conditions. This results in a high price for titanium alloys, making their use as a casing impractical. Summary of the Invention
[0004] The purpose of this utility model is to overcome the shortcomings of the prior art by providing a solid-state lithium battery encapsulation shell made of fiberglass and ceramic, which not only maintains the shape of the internal solid-state lithium battery but also has low cost and high practicality.
[0005] The technical solution of this utility model is as follows: A packaging shell for a solid-state lithium battery includes an inner shell and an outer shell, both of which are hollow. The solid-state lithium battery is installed in the hollow part of the inner shell, and the inner shell is located in the hollow part of the outer shell. The inner shell includes a first fiberglass layer, a protective layer, and a second fiberglass layer. The protective layer is disposed between the first and second fiberglass layers and is integrally formed. The outer shell includes a heat-resistant ceramic layer. The inner shell is provided with a first mounting hole and a second mounting hole, and the outer shell is provided with a third mounting hole and a fourth mounting hole. The first mounting hole and the third mounting hole are coaxially arranged, and a positive electrode insert connected to the solid-state lithium battery is fixedly disposed in the two mounting holes. The second mounting hole and the fourth mounting hole are coaxially arranged, and a negative electrode insert connected to the solid-state lithium battery is fixedly disposed in the two mounting holes.
[0006] By adopting the above technical solution and using fiberglass and ceramic to make the outer shell, the solid-state lithium battery can be kept in shape and fixed so that it will not expand and deform when heated, and the cost can be effectively reduced. Ceramic has excellent heat resistance, pressure resistance and corrosion resistance.
[0007] A further feature of this invention is that a cooling zone is formed between the first fiberglass layer and the second fiberglass layer, and the cooling zone is filled with liquid coolant to form the protective layer.
[0008] With the above-mentioned further configuration, the liquid coolant used is automotive coolant that does not require replacement. It is injected during the production and processing of the inner shell and does not need to be replaced afterward. It can absorb heat during battery charging and discharging, avoiding excessive internal temperature and affecting battery life.
[0009] A further feature of this invention is that the inner shell includes a split upper inner shell and a lower inner shell. The upper inner shell has a first recess and a positioning edge located on the outer periphery of the first recess. The lower inner shell has a second recess and a positioning groove located on the outer periphery of the second recess. After the upper and lower inner shells are installed, the positioning edge is located in the positioning groove. The first recess and the second recess cooperate to form a battery compartment adapted to a solid-state lithium battery.
[0010] With the above-mentioned further design, installation is convenient and positioning is easy, resulting in good sealing between the upper and lower shells of the inner shell and securing the battery.
[0011] A further improvement of this invention is that the upper inner shell and the lower inner shell are connected by an adhesive; the upper inner shell and the lower inner shell are connected by heat fusion.
[0012] With the above-mentioned further configuration, resin adhesive can be used to connect the upper and lower shells of the inner shell, which has good connection stability and is not easily affected by thermal expansion and contraction and moisture. Alternatively, it can be connected by hot melting. First, the surface of the fiberglass product is heated to a certain temperature, and then it is connected together by force while heated. After it cools down, a solid connection is formed, which is dense, strong and corrosion resistant.
[0013] A further improvement of this utility model is as follows: the outer shell includes a split upper outer shell and an outer lower outer shell. The upper outer shell has a third recess, and the lower outer shell has a fourth recess. When the upper and lower outer shells are installed, the third recess and the fourth recess cooperate to form the hollow part of the outer shell. The lower end face of the upper outer shell is fixed to the upper end face of the upper outer shell by welding or bonding.
[0014] With the above-mentioned further configuration, after the inner shell is installed on the outer shell, the upper and lower shells of the outer shell are sealed and fixed by welding or bonding. The sealing performance is good and the structure is firm, avoiding the expansion of the solid lithium battery during charging from affecting the firmness of the outer shell.
[0015] A further improvement of this utility model is that each mounting hole on the inner and outer shell is filled with adhesive around the outer periphery of the insert.
[0016] The above-mentioned further design ensures good sealing between the inner and outer shells, preventing rainwater and other substances from entering the inner shell and affecting the use of the solid-state lithium battery. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the packaged product according to a specific embodiment of the present invention;
[0018] Figure 2 This is a cross-sectional view of each layer of the inner and outer shell in a specific embodiment of this utility model;
[0019] Figure 3 This is a schematic diagram of the inner upper shell of a specific embodiment of the present utility model;
[0020] Figure 4 This is a schematic diagram of the lower housing in a specific embodiment of the present utility model;
[0021] Figure 5 This is a cross-sectional view of the inner shell of a specific embodiment of the present utility model;
[0022] Figure 6 This is a cross-sectional view of the outer casing of a specific embodiment of the present utility model;
[0023] Figure 7 This is a schematic diagram of the encapsulated outer shell of a specific embodiment of the present invention.
[0024] In the diagram, 1 is the inner shell; 11 is the first fiberglass; 12 is the protective layer; 13 is the second fiberglass; 14 is the first mounting hole; 15 is the second mounting hole; 16 is the inner upper shell; 161 is the first cavity; 162 is the positioning edge; 17 is the inner lower shell; 171 is the second cavity; 172 is the positioning groove; 2 is the outer shell; 22 is the fourth mounting hole; 23 is the outer upper shell; 231 is the third cavity; 24 is the outer lower shell; 241 is the fourth cavity; 3 is the positive electrode insert; 4 is the negative electrode insert; and 100 is the solid-state lithium battery. Detailed Implementation
[0025] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0026] It should be noted that all directional indicators (such as up, down, forward, backward, etc.) in the description of this utility model are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0027] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0028] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0029] like Figure 1-7 As shown, a solid-state lithium battery encapsulation shell includes an inner shell 1 and an outer shell 2, both of which are hollow. A solid-state lithium battery 100 is installed within the hollow portion of the inner shell 1, which is located within the hollow portion of the outer shell 2. The inner shell 1 includes a first fiberglass layer 11, a protective layer 12, and a second fiberglass layer 13, with the protective layer 12 disposed between the first and second fiberglass layers 11 and integrally formed. The outer shell 2 includes a heat-resistant ceramic layer. The inner shell 1 has a first mounting hole 14 and a second mounting hole 15, while the outer shell 2 has a corresponding third mounting hole and a fourth mounting hole 22. The first and third mounting holes are coaxially aligned, and a solid-state lithium battery 100 is fixed within each mounting hole. The positive electrode insert 3 connected to the lithium battery 100 is coaxially arranged with the second mounting hole 15 and the fourth mounting hole 22. The negative electrode insert 4 connected to the solid-state lithium battery 100 is fixed in the two mounting holes. The mounting holes on the inner and outer shells 2 are filled with glue around the outer periphery of the insert, which makes the inner and outer shells 2 well sealed and prevents rainwater and other substances from entering the inner shell 1 and affecting the use of the solid-state lithium battery 100. The insert is used to conduct the battery to the external power supply. The outer shell 2 is made of fiberglass and ceramic, which can not only maintain the shape of the solid-state lithium battery 100, so that the solid-state lithium battery 100 will not expand and deform when heated, but also effectively reduce costs. Ceramic has excellent heat resistance, pressure resistance and corrosion resistance.
[0030] Specifically, a cooling zone is formed between the first fiberglass 11 layer and the second fiberglass 13 layer. The cooling zone is filled with liquid coolant to form the protective layer 12. The liquid coolant is automotive coolant that does not require replacement. It is injected during the production and processing of the inner shell 1 and does not need to be replaced afterward. It can absorb heat during battery charging and discharging to prevent the internal temperature from becoming too high and affecting the battery's lifespan.
[0031] The inner shell 1 includes a split upper inner shell 16 and a lower inner shell 17. The upper inner shell 16 has a first recess 161 and a positioning edge 162 located on the outer periphery of the first recess 161. The lower inner shell 17 has a second recess 171 and a positioning groove 172 located on the outer periphery of the second recess 171. After the upper and lower inner shells are installed, the positioning edge 162 is located in the positioning groove 172. The first recess 161 and the second recess 171 cooperate to form a battery compartment adapted to the solid-state lithium battery 100, which is convenient to install and easy to position, resulting in good sealing between the upper and lower shells of the inner shell 1 and the ability to fix the battery.
[0032] The upper inner shell 16 and the lower inner shell 17 are connected by adhesive; the upper inner shell 16 and the lower inner shell 17 are connected by heat fusion. Resin adhesive can be used to connect the upper and lower shells of the inner shell 1, which has good connection stability and is not easily affected by thermal expansion and contraction and moisture. Alternatively, they can be connected by heat fusion. First, the surface of the fiberglass product is heated to a certain temperature, and then they are connected together by force while heated. After cooling, a solid connection is formed, which is dense, strong, and has good corrosion resistance.
[0033] The outer shell 2 includes a split upper outer shell 23 and an outer lower outer shell 24. The upper outer shell 23 has a third recess 231, and the lower outer shell 24 has a fourth recess. When the upper and lower outer shells are installed, the third recess 231 and the fourth recess cooperate to form the hollow part of the outer shell 2. The lower end face of the upper outer shell 23 is connected and fixed to the upper end face of the upper outer shell 23 by welding or bonding. After the inner shell 1 is installed on the outer shell 2, the upper and lower shells of the outer shell 2 are sealed and fixed by welding or bonding. The sealing performance is good and the structure is firm, avoiding the expansion of the solid lithium battery 100 during charging from affecting the firmness of the outer shell 2. The ceramic end faces can be heated to the melting point by heating sources such as lasers or electric arcs to fuse them together, or the ceramics can be bonded together by adhesives. The adhesive can be organic glue, inorganic glue, or special ceramic glue.
Claims
1. A packaging shell for a solid-state lithium battery, characterized in that, The device includes an inner shell (1) and an outer shell (2), both of which are hollow. A solid-state lithium battery (100) is installed in the hollow part of the inner shell (1), and the inner shell (1) is located in the hollow part of the outer shell (2). The inner shell (1) includes a first fiberglass (11) layer, a protective layer (12) and a second fiberglass (13) layer. The protective layer (12) is disposed between the first fiberglass (11) layer and the second fiberglass (13) layer and is integrally formed. The outer shell (2) includes heat-resistant ceramic. The inner shell (1) is provided with a first mounting hole (14) and a second mounting hole (15), and the outer shell (2) is provided with a third mounting hole and a fourth mounting hole (22). The first mounting hole (14) and the third mounting hole are coaxially arranged, and a positive electrode insert (3) connected to the solid lithium battery (100) is fixedly arranged in the two mounting holes. The second mounting hole (15) and the fourth mounting hole (22) are coaxially arranged, and a negative electrode insert (4) connected to the solid lithium battery (100) is fixedly arranged in the two mounting holes.
2. The packaging shell for a solid-state lithium battery according to claim 1, characterized in that, A cooling zone is formed between the first fiberglass (11) layer and the second fiberglass (13) layer, and the cooling zone is filled with liquid coolant to form the protective layer (12).
3. The packaging shell for a solid-state lithium battery according to claim 1 or 2, characterized in that, The inner shell (1) includes a split upper inner shell (16) and a lower inner shell (17). The upper inner shell (16) has a first recess (161) and a positioning edge (162) located on the outer periphery of the first recess (161). The lower inner shell (17) has a second recess (171) and a positioning groove (172) located on the outer periphery of the second recess (171). After the upper and lower inner shells are installed, the positioning edge (162) is located in the positioning groove (172). The first recess (161) and the second recess (171) cooperate to form a battery compartment adapted to the solid-state lithium battery (100).
4. The packaging shell for a solid-state lithium battery according to claim 3, characterized in that, The inner upper shell (16) and the inner lower shell (17) are connected by adhesive.
5. The packaging shell for a solid-state lithium battery according to claim 3, characterized in that, The inner upper shell (16) and the inner lower shell (17) are connected by heat fusion.
6. The packaging shell for a solid-state lithium battery according to claim 1 or 2, characterized in that, The outer shell (2) includes a split upper outer shell (23) and a lower outer shell (24). The upper outer shell (23) has a third cavity (231) and the lower outer shell (24) has a fourth cavity. When the upper and lower outer shells are installed, the third cavity (231) and the fourth cavity cooperate to form the hollow part of the outer shell (2). The lower end face of the upper outer shell (23) and the upper end face of the upper outer shell (23) are connected and fixed by welding or bonding.
7. The packaging shell for a solid-state lithium battery according to claim 1 or 2, characterized in that, The mounting holes on the inner and outer shells (2) are filled with adhesive around the outer periphery of the insert.