A lithium battery tab grommet structure

Abstract

The utility model relates to battery technical field discloses a kind of anti-infiltration lithium battery tab rubber structures, including shell, the outer wall of shell is fixedly connected with two baffle, the outer wall of two baffle is fixedly connected with tab, the outer wall of two tabs is provided with sealing mechanism, the outer wall of two tabs is provided with heat dissipation mechanism, the sealing mechanism includes two silicon dioxide, the outer wall of two silicon dioxide is fixedly connected in the outer wall of tab, the outer wall of two silicon dioxide is fixedly connected with the outer wall of two adhering layers, the outer wall of two adhering layers is fixedly connected with extension layer. In the utility model, when electrolyte exosmosis, pass through extension propagation path, electrolyte is transmitted along path in spiral groove, slow down the penetration rate, be absorbed by water-absorbing particle again, accidental exosmosis electrolyte is guided temporary storage, and elastic sealing layer is adaptively sealed, prevent external water vapor from entering reaction while blocking electrolyte penetration.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a permeation-proof lithium battery tab adhesive structure. Background Technology

[0002] Lithium-ion batteries use lithium metal and lithium alloys as negative electrode materials and non-aqueous electrolyte solutions. They achieve charging and discharging through the insertion and extraction of lithium ions between the positive and negative electrodes and are used in consumer electronics and new energy vehicles. Anti-permeability tab adhesive is a key sealing component of the lithium battery tab area. It has a multi-layer composite structure and is designed to fit the gap between the tab and the battery shell. Through tight bonding, it forms a sealing barrier that can effectively prevent electrolyte leakage and prevent external moisture and impurities from entering the battery. This avoids battery performance degradation and safety risks, and ensures the long-term stable operation of the lithium battery.

[0003] Traditional anti-permeability lithium battery tab adhesive relies on the density of the material itself to achieve basic sealing. It uses the tight arrangement between polymer molecules to form a physical barrier to prevent electrolyte penetration. At the same time, the material's resistance to electrolyte corrosion reduces the swelling and damage of the adhesive layer by the electrolyte, thus achieving a basic anti-permeability effect. However, there is still a problem that the tab adhesive is affected by the heat generated by resistance during charging and discharging.

[0004] Existing anti-permeability lithium battery tab adhesive structures employ a composite structure. The substrate layer ensures structural strength and electrolyte resistance, forming a core physical barrier. The adhesive layer eliminates interfacial gaps through chemical bonding, preventing electrolyte penetration from the interface. Furthermore, a functional coating is added to enhance the stability of the adhesive layer during battery charge-discharge cycles, resisting the impact of high and low temperatures and electrolyte erosion on sealing performance. However, problems still exist regarding electrolyte leakage and external impurities entering the battery through structural defects, disrupting the normal operating environment. Therefore, an anti-permeability lithium battery tab adhesive structure is proposed to address these issues. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a permeation-proof lithium battery tab adhesive structure, which aims to improve the problems of electrolyte leakage and external impurities entering the battery through structural defects and disrupting the normal working environment of the battery in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a permeation-proof lithium battery tab adhesive structure, including a shell, two partitions fixedly connected to the outer wall of the shell, tabs fixedly connected to the outer walls of the two partitions, a sealing mechanism provided on the outer walls of the two tabs, and a heat dissipation mechanism provided on the outer walls of the two tabs. The sealing mechanism includes two silica shells. The outer walls of the two silica shells are fixedly connected to the outer walls of the tabs. An adhesive layer is fixedly connected to the outer walls of the two silica shells. An extension layer is fixedly connected to the outer walls of the two adhesive layers. A support layer is fixedly connected to the outer walls of the two extension layers. Multiple water-absorbing particles are fixedly connected to the outer walls of the two support layers. A liquid-blocking layer is fixedly connected to the outer walls of the two support layers. Two spiral grooves are formed on the outer walls of the two liquid-blocking layers. A flow-guiding component is provided on the outer walls of the two liquid-blocking layers. Anti-seepage components are provided on the left and right sides of the two liquid-blocking layers.

[0007] As a further description of the above technical solution: The heat dissipation mechanism includes two heat-fusion layers. The outer walls of the two heat-fusion layers are fixedly connected to the outer walls of the tabs. The outer walls of the two heat-fusion layers are fixedly connected to heat insulation cavities. The outer walls of the two heat insulation cavities are fixedly connected to heat-conducting strips. The outer walls of the two heat-conducting strips are fixedly connected to multiple breathable membranes.

[0008] As a further description of the above technical solution: The heat dissipation mechanism also includes multiple folded edge baffles, the outer walls of which are fixedly connected to the left and right sides of the two heat-conducting strips, and the outer walls of which are provided with multiple breathable micro-slits.

[0009] As a further description of the above technical solution: The flow guiding component includes two waveform layers, the outer walls of the two waveform layers are fixedly connected to the outer wall of the liquid blocking layer, the outer walls of the two waveform layers are fixedly connected to honeycomb channels, and the outer walls of the two honeycomb channels are fixedly connected to elastic sealing layers.

[0010] As a further description of the above technical solution: The seepage-proof component includes multiple aluminum foil microlayers. The outer walls of the multiple aluminum foil microlayers are fixedly connected to the left and right sides of two liquid-blocking layers. Empty chambers are fixedly connected to the outer walls of the multiple aluminum foil microlayers. Liquid-absorbing layers are fixedly connected to the inner walls of the multiple empty chambers.

[0011] As a further description of the above technical solution: The inner wall of the outer shell is fixedly connected to a first diaphragm, and the inner wall of the first diaphragm is fixedly connected to a negative electrode material.

[0012] As a further description of the above technical solution: The inner wall of the negative electrode material is fixedly connected to a second diaphragm, and the inner wall of the second diaphragm is fixedly connected to a positive electrode material.

[0013] As a further description of the above technical solution: An electrolyte is fixedly connected to the inner wall of the positive electrode material, and a tab is fixedly connected to the outer wall of the negative electrode material.

[0014] This utility model has the following beneficial effects: In this invention, when electrolyte leaks out, the propagation path of the leaking liquid is extended by the extension layer to prevent the electrolyte from leaking out too quickly in certain areas. At the same time, silica is filled between the extension layer and the tab to improve the tightness of the connection and reduce the leakage rate of the electrolyte. The electrolyte is transmitted along the path in the spiral groove, slowing down the leakage speed. It is then absorbed by the water-absorbing particles. The accidentally leaked electrolyte is guided and evenly distributed into the honeycomb channel for temporary storage. It is then self-sealed by the elastic sealing layer to prevent external moisture from entering. At the same time, the liquid-absorbing layer and the aluminum foil micro-layer are fixed laterally to absorb the electrolyte leaking from the side and prevent external moisture from entering the interior. This prevents electrolyte leakage and external moisture from entering and reacting with the electrolyte.

[0015] In this invention, the tabs heat up during charging and discharging, and the heat-melting layer melts at high temperatures. This melts the air insulation layer generated during bonding, preventing the air insulation layer from blocking the heat from escaping. The heat transfer direction is guided by the heat insulation cavity, and then the heat dissipation is achieved by the heat-conducting strip. The breathable membrane allows a small amount of volatile gas inside the battery to escape, preventing localized heating. The folded edge baffle changes the heat transfer path, preventing heat from damaging the tab adhesive. The breathable micro-slits accelerate heat dissipation, preventing heat from being transferred to the tab adhesive and disrupting the sealing effect. Attached Figure Description

[0016] Figure 1 This is a perspective view of an anti-permeability lithium battery tab adhesive structure proposed in this utility model; Figure 2 This is a front view of an anti-permeability lithium battery tab adhesive structure proposed in this utility model; Figure 3 This is a cross-sectional view of an anti-permeability lithium battery tab adhesive structure proposed in this utility model; Figure 4 This is a cross-sectional view of a separator with an anti-permeability lithium battery tab adhesive structure proposed in this utility model; Figure 5 This is an exploded view of a flow-guiding component with an anti-permeability lithium battery tab adhesive structure proposed in this utility model; Figure 6 This is a cross-sectional view of the liquid-blocking layer of the anti-permeability lithium battery tab adhesive structure proposed in this utility model; Figure 7 This is a split view of the hot-melt layer of the anti-permeability lithium battery tab adhesive structure proposed in this utility model.

[0017] Legend: 1. Outer shell; 2. Electrode tab; 3. Separator; 4. Sealing mechanism; 401. Silica; 402. Adhesive layer; 403. Extension layer; 404. Support layer; 405. Water-absorbing particles; 406. Spiral groove; 407. Liquid-blocking layer; 408. Flow guiding component; 4081. Waveform layer; 4082. Honeycomb channel; 4083. Elastic sealing layer; 409. Leak-proof component; 4091. Empty chamber; 4092. Liquid-absorbing layer; 4093. Aluminum foil micro-layer; 5. Heat dissipation mechanism; 501. Heat fusion layer; 502. Heat insulation cavity; 503. Heat-conducting strip; 504. Breathable membrane; 505. Folded edge baffle; 506. Breathable micro-slit; 6. First diaphragm; 7. Negative electrode material; 8. Second diaphragm; 9. Positive electrode material; 10. Electrolyte. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Reference Figures 1-6 An embodiment of this utility model is provided: a permeation-proof lithium battery tab adhesive structure, including a shell 1, two partitions 3 are fixedly connected to the outer wall of the shell 1, tabs 2 are fixedly connected to the outer walls of the two partitions 3, a sealing mechanism 4 is provided on the outer walls of the two tabs 2, and a heat dissipation mechanism 5 is provided on the outer walls of the two tabs 2. The sealing mechanism 4 includes two silica gels 401, whose main function is to improve tightness and reduce the permeation rate of the electrolyte in the adhesive layer. The outer walls of the two silica gels 401 are fixedly connected to the outer walls of the tabs 2. Adhesive layers 402 are fixedly connected to the outer walls of the two silica gels 401. Extension layers 403 are fixedly connected to the outer walls of the two adhesive layers 402, whose main function is to extend the propagation path of the permeating fluid. Support layers 404 are fixedly connected to the outer walls of the two extension layers 403, whose main function is to prevent… To prevent the layers from collapsing at high temperatures, multiple water-absorbing particles 405 are fixedly connected to the outer walls of both support layers 404. Their main function is to absorb water from the leaked electrolyte. Liquid-blocking layers 407 are fixedly connected to the outer walls of both support layers 404. Their main function is to block the leakage of electrolyte. Two spiral grooves 406 are formed on the outer walls of both liquid-blocking layers 407. Their main function is to extend the electrolyte penetration path and slow down the penetration rate. Flow guiding components 408 are provided on the outer walls of both liquid-blocking layers 407 to guide the flow... Component 408 includes two corrugated layers 4081, whose main function is to guide the flow of electrolyte. The outer walls of both corrugated layers 4081 are fixedly connected to the outer wall of the liquid-resistant layer 407. Each corrugated layer 4081 has a honeycomb channel 4082 fixedly connected to its outer wall, whose main function is to temporarily store electrolyte and prevent it from spreading to the surrounding area. Each honeycomb channel 4082 has an elastic sealing layer 4083 fixedly connected to its outer wall, whose main function is to adaptively adjust to slight deformations that occur during battery use, maintaining a stable electrolyte level. The two liquid-blocking layers 407 are tightly fitted together, and anti-seepage components 409 are provided on the left and right sides of each layer. Each anti-seepage component 409 includes multiple aluminum foil micro-layers 4093, the main function of which is to prevent external moisture from entering the interior. The outer walls of the multiple aluminum foil micro-layers 4093 are fixedly connected to the left and right sides of the two liquid-blocking layers 407. The outer walls of the multiple aluminum foil micro-layers 4093 are fixedly connected to empty chambers 4091. The inner walls of the multiple empty chambers 4091 are fixedly connected to absorbent layers 4092, the main function of which is to absorb electrolyte that seeps out from the sides. Specifically, an adhesive layer 402 is fixed to the outer wall of the tab 2 and the partition 3. The outer wall of the tab 2 is connected with silica 401 to improve tightness and reduce the penetration rate of electrolyte in the adhesive layer. The propagation path of the permeated liquid is extended by the extension layer 403 to prevent the electrolyte from penetrating too quickly in some areas. The support layer 404 is used to prevent the layers from collapsing at high temperatures during heat sealing. The electrolyte that has leaked out is transmitted along the path in the two spiral grooves 406 of the liquid blocking layer 407 to slow down the penetration rate and is then absorbed by the water-absorbing particles 405. The electrolyte that leaks out accidentally is guided by the wave layer 4081 and evenly distributed into the honeycomb channel 4082 for temporary storage. The elastic sealing layer 4083 performs adaptive sealing and blocks external moisture from entering. The liquid-absorbing layer 4092 and the aluminum foil micro layer 4093 are fixed laterally to absorb the electrolyte that leaks out from the side and prevent external moisture from entering the interior.

[0020] Reference Figures 1-7The heat dissipation mechanism 5 includes two heat-melting layers 501, whose main function is to melt at high temperatures and fill the air insulation layer generated during bonding, so as to prevent the presence of the air insulation layer from blocking the heat from being discharged. The outer walls of the two heat-melting layers 501 are fixedly connected to the outer wall of the tab 2. The outer walls of the two heat-melting layers 501 are fixedly connected to the heat insulation cavity 502, whose main function is to guide the direction of heat transfer. The outer walls of the two heat insulation cavities 502 are fixedly connected to the heat-conducting strips 503, whose main function is to dissipate heat. The outer walls of the two heat-conducting strips 503 are fixedly connected to multiple breathable membranes 504, whose main function is to discharge a small amount of volatile gas inside the battery and prevent local temperature rise. The heat dissipation mechanism 5 also includes multiple folded baffles 505, whose main function is to change the heat transfer path. The outer walls of the multiple folded baffles 505 are fixedly connected to the left and right sides of the two heat-conducting strips 503. The outer walls of the multiple folded baffles 505 are provided with multiple breathable micro-slits 506, whose main function is to accelerate the heat dissipation. Specifically, the heat-fusion layer 501 melts at high temperature, filling the air insulation layer during bonding to prevent the air insulation layer from blocking the heat from escaping. The heat insulation cavity 502 guides the direction of heat transfer, and the heat-conducting strip 503 dissipates heat. At the same time, a small amount of volatile gas inside the battery is discharged through the breathable membrane 504 to prevent local temperature rise. The heat transfer path is changed by the folded edge baffle 505 to prevent heat from damaging the tab adhesive. The heat is discharged faster through the breathable micro-slit 506.

[0021] Reference Figures 1-3 The inner wall of the outer shell 1 is fixedly connected to a first diaphragm 6, whose main function is to isolate the negative electrode and the electrolyte 10. The inner wall of the first diaphragm 6 is fixedly connected to a negative electrode material 7. The inner wall of the negative electrode material 7 is fixedly connected to a second diaphragm 8, whose main function is to isolate the positive and negative electrodes. The inner wall of the second diaphragm 8 is fixedly connected to a positive electrode material 9. The inner wall of the positive electrode material 9 is fixedly connected to the electrolyte 10. The outer wall of the negative electrode material 7 is fixedly connected to a tab 2. The outer wall of the positive electrode material 9 is fixedly connected to a tab 2. Specifically, the first diaphragm 6 isolates the negative electrode and the electrolyte 10, the second diaphragm 8 isolates the positive and negative electrodes, and the two tabs 2 lead out the positive and negative electrodes through the connection with the positive electrode material 9 and the negative electrode material 7.

[0022] Working principle: First, silica 401 is connected to the outer wall of the tab 2 to improve tightness and reduce the penetration rate of electrolyte in the adhesive layer. The propagation path of the permeating liquid is extended by the extension layer 403 to prevent the electrolyte from penetrating too quickly in some areas. The support layer 404 prevents the layers from collapsing at high temperature during heat sealing. The electrolyte is transmitted along the path in the spiral groove 406 to slow down the penetration rate and is then absorbed by the water-absorbing particles 405. The electrolyte that accidentally seeps out is guided by the wave layer 4081 and evenly distributed into the honeycomb channel 4082 for temporary storage. It is then self-sealed by the elastic sealing layer 4083 to prevent external moisture from entering. At the same time, the liquid-absorbing layer 4092 and the aluminum foil micro layer 4093 are fixed laterally to absorb the electrolyte that seeps out from the side and prevent external moisture from entering the interior. Furthermore, the heat-melting layer 501 melts at high temperature, filling the air insulation layer during bonding, preventing the air insulation layer from blocking the heat from escaping. The heat insulation cavity 502 guides the direction of heat transfer, and the heat-conducting strip 503 dissipates heat. The breathable membrane 504 discharges a small amount of volatile gas inside the battery to prevent local temperature rise. The heat transfer path is changed by the folded edge baffle 505 to prevent heat from damaging the tab adhesive. The breathable micro-slits 506 accelerate the heat dissipation.

[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A permeation-resistant lithium battery tab adhesive structure, comprising a shell (1), characterized in that: Two partitions (3) are fixedly connected to the outer wall of the outer shell (1). Each of the two partitions (3) is fixedly connected to a tab (2). Each of the two tabs (2) is provided with a sealing mechanism (4) on its outer wall and a heat dissipation mechanism (5) on its outer wall. The sealing mechanism (4) includes two silica (401) shells. The outer walls of the two silica (401) shells are fixedly connected to the outer wall of the tab (2). The outer walls of the two silica (401) shells are fixedly connected to an adhesive layer (402). The outer walls of the two adhesive layers (402) shells are fixedly connected to an extension layer (403). The outer walls of the two extension layers (403) shells are fixedly connected to a support layer (404). The outer walls of the two support layers (404) shells are fixedly connected to multiple water-absorbing particles (405). The outer walls of the two support layers (404) shells are fixedly connected to a liquid-blocking layer (407). The outer walls of the two liquid-blocking layers (407) shells have two spiral grooves (406). The outer walls of the two liquid-blocking layers (407) shells are provided with a flow guiding component (408). The left and right sides of the two liquid-blocking layers (407) shells are provided with anti-seepage components (409).

2. The anti-permeability lithium battery tab adhesive structure according to claim 1, characterized in that: The heat dissipation mechanism (5) includes two heat-melting layers (501), the outer walls of the two heat-melting layers (501) are fixedly connected to the outer wall of the tab (2), the outer walls of the two heat-melting layers (501) are fixedly connected to a heat insulation cavity (502), the outer walls of the two heat insulation cavities (502) are fixedly connected to a heat-conducting strip (503), and the outer walls of the two heat-conducting strips (503) are fixedly connected to multiple breathable membranes (504).

3. The anti-permeability lithium battery tab adhesive structure according to claim 1, characterized in that: The heat dissipation mechanism (5) also includes multiple folded edge baffles (505), the outer walls of the multiple folded edge baffles (505) are fixedly connected to the left and right sides of the two heat-conducting strips (503), and the outer walls of the multiple folded edge baffles (505) are provided with multiple breathable micro-slits (506).

4. The anti-permeability lithium battery tab adhesive structure according to claim 1, characterized in that: The flow guiding component (408) includes two waveform layers (4081), the outer walls of the two waveform layers (4081) are fixedly connected to the outer wall of the liquid blocking layer (407), the outer walls of the two waveform layers (4081) are fixedly connected to a honeycomb channel (4082), and the outer walls of the two honeycomb channels (4082) are fixedly connected to an elastic sealing layer (4083).

5. The anti-permeability lithium battery tab adhesive structure according to claim 1, characterized in that: The seepage-proof component (409) includes multiple aluminum foil microlayers (4093), the outer walls of the multiple aluminum foil microlayers (4093) are fixedly connected to the left and right sides of the two liquid-blocking layers (407), the outer walls of the multiple aluminum foil microlayers (4093) are fixedly connected to empty chambers (4091), and the inner walls of the multiple empty chambers (4091) are fixedly connected to liquid-absorbing layers (4092).

6. The anti-permeability lithium battery tab adhesive structure according to claim 1, characterized in that: The inner wall of the outer shell (1) is fixedly connected to a first diaphragm (6), and the inner wall of the first diaphragm (6) is fixedly connected to a negative electrode material (7).

7. The anti-permeability lithium battery tab adhesive structure according to claim 6, characterized in that: The inner wall of the negative electrode material (7) is fixedly connected to a second diaphragm (8), and the inner wall of the second diaphragm (8) is fixedly connected to a positive electrode material (9).

8. The anti-permeability lithium battery tab adhesive structure according to claim 7, characterized in that: An electrolyte (10) is fixedly connected to the inner wall of the positive electrode material (9), and a tab (2) is fixedly connected to the outer wall of the negative electrode material (7).

Images