Thin film battery with short circuit protection and battery pack
By setting the conductive material layer at the connection between the film battery and the electrical component, the problem of short -circuit protection of the film battery is solved, the short -circuit protection function of the film battery itself is realized, the production steps are simplified, the cost is reduced, and the short circuit is effectively prevented from causing short circuits to cause the short circuit. Battery damage and fire risk.
Patent Information
- Application Number
- CN202420773938.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-04-15
AI Technical Summary
When a thin film battery is short-circuited, it is easy to cause excessive current and overheating, damage the battery life and may cause fires. The prior art requires adding a fuse between the battery and the electrical devices to prevent short-circuiting, which increases production steps and costs.
A conductive material layer is provided at the connection between the thin film battery and the electrical device. The melting point value of the conductive material layer is lower than the abnormal temperature value when a short circuit occurs in the thin film battery. This ensures that the conductive material layer melts when a short circuit occurs and disconnects the battery and the electrical device. connection to achieve short circuit protection.
By integrating the conductive material layer into the thin-film battery, the short-circuit protection function of the thin-film battery itself is achieved without adding a safety device, simplifying the production steps and reducing costs, while effectively preventing battery damage and fire risks caused by short circuits.
Smart Images
Figure CN222395015U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic components, in particular to a thin-film battery and a battery pack with short-circuit protection. Background Art
[0002] When a battery short-circuits, the resistance of the conductive parts inside the battery is very small. According to Ohm's law, a very large current will be generated in the circuit, and a large amount of heat will also be generated. The heat and electrical energy released will seriously damage the battery life. In addition, the excessive electric heat generated by the short circuit is very high, which is enough to melt general metals and cause electrical components to burn out. In severe cases, it will cause a fire, threatening property and life safety.
[0003] In order to deal with the negative impact of battery short circuit, the commonly used method of battery short circuit protection on the market is to add a safety device, such as a fuse, at the connection point between the battery and the electrical device. However, applying this method to thin-film batteries will increase the production steps and thus increase the cost.
[0004] It should be noted that the above contents are only used to assist in understanding the technical solution of the present utility model, and do not constitute an admission that the above contents are prior art. Utility Model Content
[0005] The main purpose of the utility model is to provide a thin film battery and a battery pack with short circuit protection, aiming to realize that the thin film battery itself has a short circuit protection function, so that it is not necessary to add a fuse between the battery and the electrical device, thereby simplifying the production steps and reducing costs.
[0006] To achieve the above objectives, the utility model proposes a thin film battery with short circuit protection, wherein the thin film battery is connected to an electrical device; a conductive material layer is provided at the connection between the thin film battery and the electrical device, wherein the melting point of the conductive material layer is lower than the abnormal temperature value when a short circuit occurs in the thin film battery.
[0007] Optionally, when the thin film battery adopts a sandwich structure, the thin film battery includes a pole ear end and a connecting end, and the connecting end is used to connect the electrical device; an extension frame is provided at the frame located at the edge of the thin film battery, and the pole ear end and the connecting end extend to the upper and lower sides of the extension frame respectively, and the conductive material layer is provided between the pole ear end and the connecting end.
[0008] Optionally, the tab end and the tab base where the tab end is located are provided with a first through hole penetrating therethrough, and the first through hole is used to connect the conductive material layer with the outside.
[0009] Optionally, when the tab substrate is made of non-metallic material, a metal slurry layer is provided on a side of the tab substrate away from the tab end; the metal slurry layer is provided with a second through hole penetrating therethrough, and the second through hole is interconnected with the first through hole.
[0010] Optionally, a tooth-shaped structure is provided on a side of the pole lug end facing the conductive material layer, and / or a tooth-shaped structure is provided on a side of the connecting end facing the conductive material layer.
[0011] Optionally, a first drainage cavity is provided on a side of the expansion frame, and the first drainage cavity is used to accommodate the conductive material layer in a molten state.
[0012] Optionally, a protective material layer is provided between the pole ear end and the conductive material layer, and / or between the connection end and the conductive material layer; wherein the melting point of the protective material layer is lower than the melting point of the conductive material layer.
[0013] Optionally, a second drainage cavity is provided on the side of the expansion frame, and the second drainage cavity is used to accommodate the protective material layer in a molten state.
[0014] To achieve the above object, the utility model provides a battery pack, which includes a plurality of the above-mentioned thin-film batteries with short-circuit protection, and the plurality of the thin-film batteries are connected in series or in parallel.
[0015] Optionally, the thin film batteries arranged in series or in parallel are connected to each other using the conductive material layer.
[0016] Compared with the prior art, the utility model has the following beneficial effects:
[0017] The utility model sets a conductive material layer at the connection between the thin film battery and the electrical device, wherein the melting point of the conductive material layer is lower than the abnormal temperature value when the thin film battery is short-circuited, that is, the conductive material layer is a low-temperature fusible conductive material; in this way, when a short circuit occurs inside the electrical device or the thin film battery, and the temperature rises sharply to the abnormal temperature value, the melting point of the conductive material layer is reached and it melts, thereby disconnecting the thin film battery from the electrical device, thereby playing a role in short-circuit protection. In the above technical solution, since the conductive material layer is set in the thin film battery, that is, the thin film battery itself has a short-circuit protection function, there is no need to add a safety device between the battery and the electrical device, thereby simplifying the production steps and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 It is a schematic structural diagram of a thin-film battery with a coplanar structure in one embodiment of a thin-film battery with short-circuit protection of the utility model;
[0020] Figure 2 This is a schematic diagram of the structure of a sandwich structure thin film battery in one embodiment of the thin film battery with short circuit protection of the utility model;
[0021] Figure 3 The second schematic diagram of the structure of a sandwich structure thin film battery in one embodiment of the thin film battery with short circuit protection of the utility model;
[0022] Figure 4 This is a schematic structural diagram of a thin-film battery with short-circuit protection in an embodiment of the utility model, in which a first through hole is provided at the end of the pole ear;
[0023] Figure 5 This is a schematic diagram of the structure of the metal paste layer in an embodiment of a thin-film battery with short-circuit protection of the utility model;
[0024] Figure 6 This is a schematic structural diagram of a thin-film battery with short-circuit protection in an embodiment of the utility model in which a tooth-shaped structure is provided at the end of the pole ear;
[0025] Figure 7 This is a schematic diagram of the structure of the first drainage cavity in an embodiment of a thin-film battery with short-circuit protection of the utility model;
[0026] Figure 8 This is a schematic structural diagram of a protective material layer in an embodiment of a thin-film battery with short-circuit protection of the utility model;
[0027] Fig. 9 This is a schematic diagram of the structure of the second drainage cavity in an embodiment of a thin-film battery with short-circuit protection of the utility model (the left picture shows that the second drainage cavity is not filled with the protective material layer, and the right picture shows that the second drainage cavity is filled with the protective material layer);
[0028] Fig.10 It is a schematic structural diagram of dry thin film batteries connected in series in one embodiment of the thin film battery with short circuit protection of the utility model.
[0029] The names of the components marked in the figure are as follows:
[0030]
[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, what is described is only a part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0034] In addition, it should be noted that the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0035] This embodiment discloses a thin film battery 1 with short circuit protection, wherein the thin film battery 1 is connected to an electrical device 2; a conductive material layer 3 is provided at the connection between the thin film battery 1 and the electrical device 2, wherein the melting point of the conductive material layer 3 is lower than the abnormal temperature value when a short circuit occurs in the thin film battery 1.
[0036] The utility model sets a conductive material layer 3 at the connection between the thin film battery 1 and the electrical device 2, wherein the melting point of the conductive material layer 3 is lower than the abnormal temperature value when the thin film battery 1 is short-circuited, that is, the conductive material layer 3 is a low-temperature fusible conductive material; in this way, when a short circuit occurs inside the electrical device 2 or the thin film battery 1, when the temperature rises sharply to the abnormal temperature value, the conductive material layer 3 melts due to the melting point reached, thereby disconnecting the thin film battery 1 from the electrical device 2, thereby playing a role in short circuit protection. In the above technical solution, since the conductive material layer 3 is set in the thin film battery 1, that is, the thin film battery 1 itself has a short circuit protection function, there is no need to add a safety device between the battery and the electrical device 2, thereby achieving the purpose of simplifying the production steps and reducing costs.
[0037] In this embodiment, the conductive material layer 3 may be made of tin (melting point of 130-190° C.) or a conductive adhesive (melting point of 100-300° C.).
[0038] Reference Figure 1 When the thin film battery 1 adopts a coplanar structure, since the positive and negative tabs of the thin film battery 1 are in the same plane, after the single coplanar thin film battery 1 is printed on the electrical device 2, the two tabs are in the same plane as the electrical device 2, so the two tabs can be directly connected to the electrical device 2. At this time, the conductive material layer 3 can be set on one of the two tabs or both.
[0039] Reference Figure 2-3 When the thin film battery 1 adopts a sandwich structure, the thin film battery 1 includes a tab end 4 and a connection end 5, and the connection end 5 is used to connect the electrical device 2; an extension frame 7 is provided at the frame 6 at the edge of the thin film battery 1, and the tab end 4 and the connection end 5 extend to the upper and lower sides of the extension frame 7 respectively, and a conductive material layer 3 is provided between the tab end 4 and the connection end 5. In this arrangement, considering that the positive and negative tabs of the thin film battery 1 with a sandwich structure are not on the same plane, after a single sandwich structure thin film battery 1 is printed on the electrical device 2, only one of its tabs is on the same plane as the electrical device 2, so one of its tabs can be directly connected to the electrical device 2; and its two tabs are on different planes from the electrical device 2, so its two tabs and the electrical device 2 need to be indirectly connected to the electrical device 2 by other means. Therefore, the main research object of this application is how to stably connect its two tabs to the electrical device 2 while playing the role of short-circuit protection. For the convenience of description, unless otherwise specified, the tab end 4 in this application is assumed to be its two tabs.
[0040] Based on the above considerations, in this embodiment, an additional extension frame 7 is provided at the frame 6 of the thin film battery 1, and the tab end 4 and the connection end 5 of the thin film battery 1 are extended to the upper and lower sides of the extension frame 7, and a conductive material layer 3 is provided between the tab end 4 and the connection end 5. When the thin film battery 1 is heat-sealed, the temperature of the conductive material layer 3 will rise slightly and melt to act as a binder between the tab end 4 and the connection end 5, so that the tab end 4 and the connection end 5 are mutually conductive. When a short circuit occurs, the conductive material layer 3 is heated to form a molten state, and the molten conductive material layer 3 can no longer act as a binder between the tab end 4 and the connection end 5, resulting in the disconnection between the tab end 4 and the connection end 5; and because the extension frame 7, which is part of the frame 6, also has a certain elasticity, the tab end 4 and the connection end 5 are separated from each other under the action of the elasticity of the extension frame 7 itself, so that the thin film battery 1 is disconnected from the electrical device 2. The above technical solution not only completes the connection between the sandwich structure thin film battery 1 and the electrical device 2, but also plays a role in short circuit protection.
[0041] Further, see Attachment Figure 4 The tab end 4 and the tab base 10 where the tab end 4 is located are provided with a first through hole 401 which is arranged through the tab end 4. The first through hole 401 is used to connect the conductive material layer 3 with the outside. With such arrangement, when the thin film battery 1 is heat-sealed, the conductive material layer 3 in a molten state is partially squeezed outward through the first through hole 401, thereby adhering to the outside of the tab base 10. The conductive material layer 3 after cooling re-solidifies to form a rivet-like structure, which greatly increases the connection strength between the single-cell sandwich structure thin film battery 1 and the electrical device 2. Moreover, when a short circuit occurs, it does not hinder the separation of the tab end 4 and the connection end 5, thereby playing a role in short circuit protection.
[0042] Based on the above embodiment, improvements are made. Figure 5 When the tab substrate 10 is made of non-metallic material, the non-metallic tab substrate 10 is not conducive to the adhesion of the conductive material layer 3; therefore, a metal slurry layer 8 is provided on the side of the tab substrate 10 away from the tab end 3; the metal slurry layer 8 is provided with a second through hole 801 that is arranged through, and the second through hole 801 is interconnected with the first through hole 401. With such a configuration, when the thin-film battery 1 is heat-sealed, the conductive material layer 3 in a molten state is squeezed outward through the first through hole 401 and the second through hole 801 in turn, thereby adhering to the outside of the metal slurry layer 8. After cooling, the conductive material layer 3 re-solidifies to form a rivet-like structure, which greatly increases the connection strength between the monomer sandwich structure thin-film battery 1 and the electrical device 2. And when a short circuit occurs, it does not hinder the separation of the tab end 4 and the connection end 5, which plays a role in short circuit protection.
[0043] Further, see Attachment Figure 6, a tooth-like structure is provided on the side of the pole ear end 4 facing the conductive material layer 3 (as shown in the attached figure), or a tooth-like structure is provided on the side of the connection end 5 facing the conductive material layer 3, or a tooth-like structure is provided on the side of the pole ear end 4 and the connection end 5 facing the conductive material layer 3. With such a configuration, when the thin-film battery 1 is heat-sealed, the conductive material layer 3 and the pole ear end 4 / connection end 5 form a chimeric connection relationship through the tooth-like structure, which greatly increases the tightness and reliability of the connection between the sandwich structure thin-film battery 1 and the electrical device 2, thereby reducing the failure risk of the connection between the thin-film battery 1 and the electrical device 2. At the same time, because the pole ear end 4 / connection end 5 with a tooth-like structure occupies a certain gap space between the pole ear end 4 and the connection end 5, the amount of conductive material layer 3 that needs to be added is reduced, which is conducive to reducing the production cost of the enterprise.
[0044] Further, see Attachment Figure 7 The side of the expansion frame 7 is provided with a first drainage cavity 701, and the first drainage cavity 701 is used to accommodate the conductive material layer 3 in a molten state. With such a configuration, when a short circuit occurs, the conductive material layer 3 in a molten state can quickly flow to the first drainage cavity 701 located at the side of the expansion portion, so that the conductive material can be separated from the pole ear end 4 more quickly, thereby improving the short circuit protection performance.
[0045] Further, see Attachment Figure 8 , a protective material layer 9 is provided between the tab end 4 and the conductive material layer 3; or a protective material layer 9 is provided between the connection end 5 and the conductive material layer 3; or a protective material layer 9 is provided between the tab end 4 and the conductive material layer 3, and between the connection end 5 and the conductive material layer 3; wherein the melting point of the protective material layer 9 is lower than the melting point of the conductive material layer 3. With such a configuration, when the thin film battery 1 needs to be used, the thin film battery 1 is slightly heated, the protective material layer 9 is molten, and then the tab end 4 and the connection end 5 are manually pressed together to be close to each other, so that the tab end 4, the conductive material layer 3 and the connection end 5 can be effectively connected, and the electrical connection between the electrical device 2 and the thin film battery 1 is realized. Since the above steps require manual intervention to ensure the normal operation of the thin film battery 1, that is, when the thin film battery 1 is in the storage state, since no manual intervention occurs, the thin film battery 1 is in the standby state, thereby playing the role of battery storage.
[0046] In this embodiment, the protective material layer 9 can be made of low-temperature wax (melting point value is 45-100° C.) or low-temperature rosin (melting point value is 60-110° C.).
[0047] Further, see Attachment Fig. 9, a second drainage cavity 702 is provided on the side of the expansion frame 7, and the second drainage cavity 702 is used to accommodate the protective material layer 9 in a molten state. With such a configuration, when the thin-film battery 1 needs to be used, the thin-film battery 1 is slightly heated, and the protective material layer 9 is in a molten state. Since the tab end 4 and the connection end 5 are pressed together manually and brought close to each other, the protective material layer 9 in a molten state is squeezed and flows into the second drainage cavity 702 located on the side of the expansion frame 7. When the thin-film battery 1 is not in use, the thin-film battery 1 is slightly heated, so that the conductive material layer 3 is in a molten state, and the tab end 4 and the connection end 5 are separated from each other. At this time, the second protective material layer flows from the second drainage cavity 702 again to the gap between the tab end 4 and the connection end 5, so that the tab end 4 and the connection end 5 need to be pressed together manually when used next time, and the protective material layer 9 has the function of battery storage again. That is to say, the protective material layer 9 not only plays the same role of short-circuit protection as the conductive material layer 3, but also plays the role of a switch of the thin-film battery 1 (the tab end 4 and the connection end 5 need to be manually pressed together when in use).
[0048] This embodiment also discloses a battery pack, including a thin film battery with short circuit protection according to any of the above embodiments. The specific structure of the thin film battery with short circuit protection can be referred to the above embodiments. Since the battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.
[0049] Furthermore, several thin film batteries 1 are connected in series or in parallel. In this way, a plurality of printed thin film batteries 1 are connected in series or in parallel and used together to provide a higher voltage and more capacity.
[0050] Furthermore, the thin film batteries 1 arranged in series or in parallel are connected to each other by a conductive material layer 3. In this way, when a plurality of thin film batteries 1 are connected in series or in parallel, in addition to providing a conductive material layer 3 at the connection between the thin film battery 1 and the electrical device 2, a conductive material layer 3 can also be provided between the thin film batteries 1; in this way, when a short circuit occurs in one of the single thin film batteries 1, the series / parallel path is disconnected in time, and the other single thin film batteries 1 are protected.
[0051] It should be noted that other contents of the thin-film battery with short-circuit protection disclosed in the present invention are prior art and will not be described in detail here.
[0052] The above are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any direct / indirect application of the present invention in other related technical fields is included in the patent protection scope of the present invention.
Claims
1. A thin film battery with short circuit protection, wherein the thin film battery is connected to an electrical device; characterized in that: A conductive material layer is provided at the connection between the thin film battery and the electrical device, wherein the melting point of the conductive material layer is lower than the abnormal temperature value when a short circuit occurs in the thin film battery.
2. The thin film battery with short circuit protection according to claim 1, characterized in that: When the thin film battery adopts a sandwich structure, the thin film battery includes a pole ear end and a connecting end, and the connecting end is used to connect the electrical device; an extension frame is provided at the frame located at the edge of the thin film battery, and the pole ear end and the connecting end extend to the upper and lower sides of the extension frame respectively, and the conductive material layer is provided between the pole ear end and the connecting end.
3. The thin film battery with short circuit protection according to claim 2, characterized in that: The tab end and the tab base where the tab end is located are provided with a first through hole that penetrates through, and the first through hole is used to connect the conductive material layer with the outside.
4. The thin film battery with short circuit protection according to claim 3, characterized in that: When the tab substrate is made of non-metallic material, a metal slurry layer is provided on one side of the tab substrate away from the tab end; the metal slurry layer is provided with a second through hole penetrating therethrough, and the second through hole is interconnected with the first through hole.
5. The thin film battery with short circuit protection according to claim 2, characterized in that: A tooth-shaped structure is provided on a side of the pole lug end facing the conductive material layer, and / or a tooth-shaped structure is provided on a side of the connection end facing the conductive material layer.
6. The thin film battery with short circuit protection according to claim 2, characterized in that: A first drainage cavity is provided on the side of the expansion frame, and the first drainage cavity is used to accommodate the conductive material layer in a molten state.
7. The thin film battery with short circuit protection according to claim 2, characterized in that: A protective material layer is provided between the pole tab end and the conductive material layer, and / or between the connection end and the conductive material layer; wherein the melting point of the protective material layer is lower than the melting point of the conductive material layer.
8. The thin film battery with short circuit protection according to claim 7, characterized in that: A second drainage cavity is provided on the side of the expansion frame, and the second drainage cavity is used to accommodate the protective material layer in a molten state.
9. A battery pack, characterized in that: The battery pack comprises a plurality of thin-film batteries with short-circuit protection as claimed in any one of claims 1 to 8, and the plurality of thin-film batteries are connected in series or in parallel with each other.
10. The battery pack according to claim 9, characterized in that: The thin film batteries arranged in series or in parallel are connected to each other by using the conductive material layer.