Printed film battery and battery pack

Abstract

The utility model discloses a printed film battery and a battery pack. The printed film battery is used for supplying power to an electric device. The printed thin-film battery is characterized in that the printed thin-film battery comprises a first conductive layer and a second conductive layer which are oppositely arranged up and down, the first conductive layer is used for being electrically connected with a tab end of the printed thin-film battery, and the second conductive layer is used for being electrically connected with a connecting end of the electric device; the first conductive layer and the second conductive layer are electrically connected directly or through a chemical structure layer. According to the utility model, the two tabs of the sandwich-structured printed film battery can be smoothly and stably connected with an electric device.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic components, in particular to a printed thin-film battery and a battery pack. Background Art

[0002] Printed thin-film batteries have good flexibility and can be easily integrated with some flexible electrical devices without affecting the normal use of flexible electrical devices. Among the many integration methods, the most commonly used is to directly print thin-film batteries on the surface of flexible electrical devices. This method can reduce the thickness of the integrated flexible electrical devices and make them more convenient to use.

[0003] Traditional printed thin-film batteries include coplanar structures and sandwich structures. The coplanar structure can be directly connected to the electrical device, but due to structural reasons, the overall capacity is low, and due to its own structural deficiencies, the overall battery internal resistance is high, which is not suitable for high-current discharge applications. The sandwich structure has high capacity and low internal resistance, and can be used in both low-current and high-current scenarios. However, since the two tabs of a single sandwich-structured printed thin-film battery are on different planes, after a single sandwich-structured battery is printed on an electrical device, only one of its tabs is on the same plane as the electrical device, so one of its tabs can be directly connected to the electrical device; while the second tab is on a different plane from the electrical device, so the second tab and the electrical device need to be indirectly connected to the electrical device through other means.

[0004] At present, it is commonly used to connect the two-pole ears to the electrical device using rivets or conductive tape; Figure 1 As shown in Figure a, although riveting can make the connection stable, the presence of heavy rivets will greatly reduce the mechanical properties of flexible electrical devices and increase the thickness of thin-film batteries. Figure 1 As shown in Figure b, although the conductive tape can connect the two poles of the thin-film battery to the connection end of the electrical device, during the use of the flexible electrical device integrated with the thin-film battery, bending and bending may cause the conductive tape to fall off and lead to connection failure.

[0005] 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

[0006] The main purpose of the utility model is to provide a printed thin film battery and a battery pack, aiming to achieve that the two poles of the sandwich structure printed thin film battery can be smoothly and stably connected to the electrical device.

[0007] It should be noted that, since the background technology has clearly stated that the sandwich structure printed thin film battery includes two tabs, one of which can be directly connected to an electrical device, the main research object of this application is how to stably connect the two tabs to the electrical device. For the convenience of description, unless otherwise specified, the tab ends in this application are assumed to be the two tabs.

[0008] To achieve the above-mentioned purpose, the utility model proposes a printed thin-film battery, which is used to power electrical devices; the printed thin-film battery includes a first conductive layer and a second conductive layer arranged opposite to each other up and down, the first conductive layer is used to be electrically connected to the pole ear end of the printed thin-film battery, and the second conductive layer is used to be electrically connected to the connection end of the electrical device; the first conductive layer and the second conductive layer are directly electrically connected or electrically connected through a chemical structure layer.

[0009] Optionally, the first conductive layer and the second conductive layer are arranged in an expansion frame of a closed structure; the chemical structure layer includes a first active material layer, a second active material layer and an electrolyte layer, the first active material layer is connected to the first conductive layer, and the second active material layer is connected to the second conductive layer; the electrolyte layer is arranged between the first active material layer and the second active material layer, wherein the electrolyte layer reacts with the first active material layer and the second active material layer; the solvent in the electrolyte layer is consumed during the reaction, so that the expansion frame is pressed under the action of atmospheric pressure, thereby connecting the first conductive layer and the second conductive layer to each other.

[0010] Optionally, both the first active material layer and the second active material layer are provided with a concave-convex structure, and the first active material layer and the second active material layer are interlocked and connected with each other through the concave-convex structure.

[0011] Optionally, the first conductive layer and the second conductive layer are both provided with a concave-convex structure, and the first conductive layer and the second conductive layer are mutually interlocked and connected through the concave-convex structure; the first active material layer is arranged in the gap between the concave-convex surface of the first conductive layer, and the second active material layer is arranged in the gap between the concave-convex surface of the second conductive layer.

[0012] Optionally, the printed thin film battery includes a battery main body area and a conductive connection area, the expansion frame is arranged in the conductive connection area, and the battery body of the printed thin film battery is arranged in the battery main body area; wherein the battery main body area adopts a metal composite film substrate, and the conductive connection area adopts a polymer substrate or a metal composite film substrate.

[0013] Optionally, the battery body includes a first electrode layer and a second electrode layer, wherein the first electrode layer is arranged at the same polarity as the first active material layer, and the second electrode layer is arranged at the same polarity as the second active material layer; or, the first electrode layer has opposite polarity to the first active material layer, and the second electrode layer has opposite polarity to the second active material layer.

[0014] Optionally, a partition frame is provided between the battery main body area and the conductive connection area, or no partition frame is provided between the battery main body area and the conductive connection area; when no partition frame is provided between the battery main body area and the conductive connection area, the battery main body area and the conductive connection area both adopt a metal composite film substrate.

[0015] Optionally, the conductive connection area is arranged outside the battery main body area.

[0016] Optionally, the conductive connection area is arranged outside the battery main body area, and the conductive connection area surrounds the battery main body area.

[0017] To achieve the above object, the utility model provides a battery pack, comprising a plurality of the above-mentioned printed thin-film batteries, wherein the plurality of the printed thin-film batteries are connected in series or in parallel.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model uses the first conductive layer and the second conductive layer to extend the tab end of the printed thin film battery and the connection end of the electrical device respectively, and the extended first conductive layer and the second conductive layer are arranged relatively to each other up and down; at this time, there are upper and lower overlapping areas between the first conductive layer and the second conductive layer, and then the first conductive layer and the second conductive layer are directly electrically connected or electrically connected through a chemical structure layer to achieve stable connection between the tab end of the printed thin film battery and the connection end of the electrical device.

[0020] In addition, when the first conductive layer and the second conductive layer are electrically connected through the chemical structure layer, the first conductive layer and the second conductive layer are arranged in an expansion frame of a closed structure. On the one hand, the expansion frame is used to improve the stability of the mechanical connection; on the other hand, the expansion frame is used as a space container for the first conductive layer, the second conductive layer and the chemical structure layer to ensure that the chemical structure layer performs a corresponding chemical reaction in the expansion frame to avoid leakage and other adverse conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 It is a schematic diagram of the structure of a printed thin film battery in the background technology;

[0023] Figure 2 This is a schematic structural diagram of an embodiment of a printed thin-film battery of the utility model;

[0024] Figure 3 Yes Figure 2 A local enlarged view of point A in FIG.

[0025] Figure 4 This is a schematic diagram of a structure in which the first active material layer and the second active material layer of an embodiment of the printed thin film battery of the utility model adopt a concave-convex structure;

[0026] Figure 5 This is a second structural schematic diagram of a printed thin-film battery in an embodiment of the utility model in which the first active material layer and the second active material layer adopt a concave-convex structure;

[0027] Figure 6 It is a schematic structural diagram of a printed thin-film battery in an embodiment of the utility model in which the first conductive layer and the second conductive layer adopt a concave-convex structure;

[0028] Figure 7 It is a schematic structural diagram of a printed thin-film battery in an embodiment of the utility model in which a conductive connection area adopts a polymer substrate;

[0029] Figure 8 It is a schematic structural diagram of a printed thin-film battery in an embodiment of the utility model in which the first electrode layer and the first active material layer are arranged at the same polarity;

[0030] Fig. 9 This is a schematic diagram of a structure in which the first electrode layer and the first active material layer have opposite polarities in an embodiment of a printed thin-film battery of the utility model;

[0031] Fig.10 It is a schematic structural diagram of an embodiment of a printed thin-film battery of the utility model in which no separation frame is provided between the battery main body area and the conductive connection area;

[0032] Fig.11 This is a schematic diagram of a structure in which a conductive connection area is arranged outside a battery main body area in an embodiment of a printed thin film battery of the utility model;

[0033] Fig.12 This is the second structural schematic diagram of an embodiment of a printed thin-film battery of the utility model in which a conductive connection area is arranged outside a battery main body area.

[0034] The names of the components marked in the figure are as follows:

[0035]

[0036] 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

[0037] 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.

[0038] 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.

[0039] 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.

[0040] This embodiment discloses a printed thin film battery 1, which is used to supply power to an electrical device 2; Figure 2 The printed thin film battery 1 includes a first conductive layer 3 and a second conductive layer 4 which are arranged opposite to each other in an upper and lower manner. The first conductive layer 3 is used to be electrically connected to the pole ear end 101 of the printed thin film battery 1, and the second conductive layer 4 is used to be electrically connected to the connection end 201 of the electrical device 2; the first conductive layer 3 is electrically connected to the second conductive layer 4 directly or through the chemical structure layer 5.

[0041] The utility model uses the first conductive layer 3 and the second conductive layer 4 to extend the tab end 101 of the printed thin film battery 1 and the connection end 201 of the electrical device 2, and the extended first conductive layer 3 and the second conductive layer 4 are arranged opposite to each other up and down; at this time, there is an upper and lower overlap area between the first conductive layer 3 and the second conductive layer 4, and then the first conductive layer 3 and the second conductive layer 4 are directly electrically connected or electrically connected through the chemical structure layer 5, so as to achieve a stable connection between the tab end 101 of the printed thin film battery 1 and the connection end 201 of the electrical device 2. Among them, the first conductive layer 3 and the second conductive layer 4 can be formed by printing.

[0042] As a preferred solution of the above embodiment, refer to the attached Figure 3, the first conductive layer 3 and the second conductive layer 4 are arranged in the expansion frame 11 of the closed structure; when the first conductive layer 3 and the second conductive layer 4 are electrically connected by chemical structure, the chemical structure layer 5 includes a first active material layer 501, a second active material layer 502 and an electrolyte layer 503, the first active material layer 501 is connected to the first conductive layer 3, and the second active material layer 502 is connected to the second conductive layer 4; the electrolyte layer 503 is arranged between the first active material layer 501 and the second active material layer 502, wherein the electrolyte layer 503 reacts with the first active material layer and the second active material layer 502; during the reaction, the solvent in the electrolyte layer 503 is consumed so that the expansion frame 11 is pressed under the action of atmospheric pressure, thereby connecting the first conductive layer 3 and the second conductive layer 4 to each other. In this arrangement, the first conductive layer 3 is used to extend the tab end 101 of the printed thin film battery 1 to the upper side of the expansion frame 11, and the first active material layer 501 is arranged on the first conductive layer 3; the second conductive layer 4 is used to extend the connection end 201 of the electrical device 2 to the lower side of the expansion frame 11, and the second active material layer 502 is arranged on the second conductive layer 4. At this time, the first conductive layer 3 and the second conductive layer 4 have upper and lower overlapping areas, and the first conductive layer 3 and the second conductive layer 4 are arranged inside the expansion frame 11 of the closed structure, and the electrolyte layer is arranged inside the expansion frame 11. In the expansion frame 11, the electrolyte layer 503 reacts with the first active material layer 501 and the second active material layer 502, so that the solvent in the electrolyte layer 503 is consumed, so that the internal space of the expansion frame 11 gradually shrinks, and is pressed together under the action of atmospheric pressure (that is, the first conductive layer 3 and the second conductive layer 4 are close to each other), so that the first conductive layer 3 and the second conductive layer 4 are directly connected, so that the tab end 101 of the printed thin film battery 1 is connected to the connection end 201 of the electrical device 2. In the above process, the expansion frame 11 bears the mechanical strain, and the chemical structure layer 5 bears the electrical connection between the tab end 101 and the connection end 201. In this way, the two functions of bearing force and conducting electricity are separated, which does not affect the flexibility of the integrated electronic components, strengthens the connection strength of the printed thin film battery 1 and the electrical device 2, and increases the diversity of the connection methods of electrical connection and mechanical connection.

[0043] In this embodiment, the first active material layer 501 can be an electrode layer obtained by coating and drying zinc paste, wherein the zinc paste is prepared by mixing zinc powder with carbon black, a polymer binder and a solvent; the second active material layer 502 can be an electrode layer obtained by coating and drying manganese paste, wherein the manganese paste is prepared by mixing manganese dioxide powder with carbon black, a polymer binder and a solvent; the electrolyte layer 503 is an aqueous solution of zinc salt and ammonium salt, and the solvent water in the electrolyte layer 503 is consumed during the chemical reaction between the electrolyte layer 503 and the first active material layer 501 and the second active material layer 502.

[0044] Further, see Attachment Figure 4-5 , the first active material layer 501 and the second active material layer 502 are both provided with a concave-convex structure, and the first active material layer 501 and the second active material layer 502 are interlocked and connected with each other through the concave-convex structure. In this way, the first active material layer 501 and the second active material layer 502 are interlocked and connected with each other through the concave-convex structure to improve the tightness and reliability of the connection between the first active material layer 501 and the second active material layer 502, thereby reducing the failure risk of the connection between the printed thin film battery 1 and the electrical device 2, and at the same time reducing the contact resistance between the printed thin film battery 1 and the electrical device 2.

[0045] Specifically, the concave-convex structure may be an interdigitated structure or a mosaic structure, and the cross-section thereof may be in the shape of a triangle, an arc, a special shape, etc., and the specific structure of the concave-convex mosaic structure is not limited here. Figure 4 As shown in Figure a, the first active material layer 501 and the second active material layer 502 are respectively a frame-shaped grid structure and a lattice structure; Figure 4 As shown in the middle figure b, the first active material layer 501 and the second active material layer 502 are both strip-shaped structures.

[0046] Further, see Attachment Figure 6 , the first conductive layer 3 and the second conductive layer 4 are both provided with a concave-convex structure, and the first conductive layer 3 and the second conductive layer 4 are interlocked and connected with each other through the concave-convex structure; when the first active material layer 501 and the second active material layer 502 are conductive materials, the first active material layer 501 is distributed on the concave-convex surface of the first conductive layer 3, and the second active material layer 502 is distributed on the concave-convex surface of the second conductive layer 4; when the first active material layer 501 and the second active material layer 502 are non-conductive materials, the first active material layer 501 is arranged in the gap between the concave-convex surface of the first conductive layer 3, and the second active material layer 502 is arranged in the gap between the concave-convex surface of the second conductive layer 4. In this way, the first conductive layer 3 and the second conductive layer 4 are interlocked and connected with each other through the concave-convex structure to improve the tightness and reliability of the connection between the first conductive layer 3 and the second conductive layer 4, thereby reducing the failure risk of the connection between the printed thin film battery 1 and the electrical device 2, and at the same time reducing the contact resistance between the printed thin film battery 1 and the electrical device 2. Refer to Attachment Figure 6 In Figure a, when the first active material layer 501 and the second active material layer 502 are conductive materials, the first active material layer 501 is distributed on the concave-convex surface of the first conductive layer 3, and the second active material layer 502 is distributed on the concave-convex surface of the second conductive layer 4. At this time, the first conductive layer 3 and the second conductive layer 4 can be connected to each other through the first active material layer 501 and the second active material layer 502; refer to the attached Figure 6In Figure b, when the first active material layer 501 and the second active material layer 502 are non-conductive materials, the first active material layer 501 is arranged in the gap between the concave and convex surfaces of the first conductive layer 3, and the second active material layer 502 is arranged in the gap between the concave and convex surfaces of the second conductive layer 4. At this time, the first conductive layer 3 and the second conductive layer 4 are connected through direct contact.

[0047] As a preferred solution of the above embodiment, refer to the attached Figure 7 The printed thin film battery 1 includes a battery main body area 6 and a conductive connection area 7, the expansion frame 11 is arranged in the conductive connection area 7, and the battery main body 102 of the printed thin film battery 1 is arranged in the battery main body area 6; wherein the battery main body area 6 adopts a metal composite film substrate 801, and the conductive connection area 7 adopts a polymer substrate 802 or a metal composite film substrate 801. Preferably, in this embodiment, the conductive connection area 7 adopts a polymer substrate 802. In this arrangement, considering that the battery main body 102 should be waterproof when used, the battery main body area 6 where the battery main body 102 is located adopts a metal composite film substrate 801 with waterproof properties. As for the conductive connection area 7 where the first conductive layer 3 and the second conductive layer 4 are located, since the reaction between the first active material layer 501 / the second active material layer 502 and the electrolyte layer will cause the solvent to volatilize, this process takes a certain time, so the polymer substrate 802 in the conductive connection area 7 allows the solvent moisture to volatilize through the polymer substrate 802, greatly reducing the reaction time and improving the efficiency.

[0048] Among them, the metal composite film substrate 801 is a composite layer material, which contains a common film layer (PET\PS polymer) and a metal layer; the polymer substrate 802 is a common film layer (PET\PS polymer).

[0049] Further, see Attachment Figure 8The battery body 102 includes a first electrode layer 901 and a second electrode layer 902, wherein the first electrode layer 901 is arranged at the same pole as the first active material layer 501, and the second electrode layer 902 is arranged at the same pole as the second active material layer 502; in this arrangement, since the utility model is a printed thin film battery 1 with a sandwich structure, the first electrode layer 901 and the second electrode layer 902 of the battery body 102 are firstly printed on the A side and the B side as the interface during the printing process, wherein the battery body 102 part on the A side is directly connected to the positive electrode of the electrical device 2 through its one pole ear, and the battery body 102 part on the B side is indirectly connected to the negative electrode of the electrical device 2 through its two pole ears, that is, the first electrode layer 901 and the first active material layer 501 are arranged on the same side (B side), and the second electrode layer 902 and the second active material layer 502 are arranged on the same side (A side). In this way, the first active material layer 501 can be printed and coated at the same time as the first electrode layer 901 is printed and coated, and the second active material layer 502 can be printed and coated at the same time as the second electrode layer 902 is printed and coated. Compared with the first electrode layer 901 having opposite polarity to the first active material layer 501, the second electrode layer 902 has opposite polarity to the second active material layer 502, and no production steps are added, and the connection steps of the printed thin-film battery 1 and the electrical device 2 are reduced, making the processing of the integrated electronic components more time-saving and labor-saving, which is beneficial to the processing efficiency of the integrated electronic components.

[0050] Of course, in other embodiments, refer to the attached Fig. 9 The polarities of the first electrode layer 901 and the first active material layer 501 may also be set to be different. Correspondingly, the polarities of the second electrode layer 902 and the second active material layer 502 are also different. The polarities of the first active material layer 501 and the first electrode layer 901 are not restricted herein.

[0051] Furthermore, a partition frame 10 is provided between the battery main body area 6 and the conductive connection area 7, or a partition frame 10 is not provided between the battery main body area 6 and the conductive connection area 7; Fig.10 As shown, the partition frame 10 is removed between the battery main body area 6 and the conductive connection area 7, which can simplify the process flow. It can be understood that since there is no partition frame 10 between the battery main body area 6 and the conductive connection area 7 at this time, that is, the battery main body area 6 and the conductive connection area 7 are connected in space, it is necessary to use a metal composite film substrate 801 for both the battery main body area 6 and the conductive connection area 7 to ensure the overall waterproof performance of the printed thin film battery 1. It can be understood that the partition frame 10 in this embodiment can also be understood as the corresponding part of the expansion frame 11 responsible for partitioning the battery main body area 6 and the conductive connection area 7.

[0052] Further, see Attachment Fig.11The conductive connection area 7 is arranged outside the battery main body area 6. In this way, the peripheral area of ​​the battery main body area 6 is used to form the conductive connection area 7, and the space is reasonably used without damaging the capacity of the battery main body 102 itself.

[0053] Further, see Attachment Fig.12 , the conductive connection area 7 is arranged outside the battery main body area 6, and the conductive connection area 7 surrounds the battery main body area 6. In this way, the peripheral area of ​​the battery main body area 6 is used to form the conductive connection area 7, and the space is reasonably used without damaging the capacity of the battery body 102 itself. In addition, since the conductive connection area 7 in this embodiment surrounds the outside of the battery main body area 6, the conductive connection area 7 can also serve as the peripheral protection of the battery main body area 6. When the electrolyte leaks in the battery main body area 6, the conductive connection area 7 can absorb the overflowed electrolyte.

[0054] This embodiment also discloses a battery pack, including a printed thin film battery in any of the above embodiments. The specific structure of the printed thin film battery 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.

[0055] Furthermore, a plurality of printed thin film batteries 1 are connected in series or in parallel with each other. 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.

[0056] It should be noted that other contents of the printed thin film battery disclosed in the present invention are prior art and will not be described in detail here.

[0057] 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 printed thin film battery, wherein the printed thin film battery is used to supply power to an electrical device; characterized in that: The printed thin film battery includes a first conductive layer and a second conductive layer which are arranged opposite to each other in an upper and lower manner. The first conductive layer is used to be electrically connected to the tab end of the printed thin film battery, and the second conductive layer is used to be electrically connected to the connection end of the electrical device. The first conductive layer and the second conductive layer are directly electrically connected or electrically connected through a chemical structure layer.

2. The printed thin film battery according to claim 1, characterized in that: The first conductive layer and the second conductive layer are arranged in an expansion frame of a closed structure; the chemical structure layer includes a first active material layer, a second active material layer and an electrolyte layer, the first active material layer is connected to the first conductive layer, and the second active material layer is connected to the second conductive layer; the electrolyte layer is arranged between the first active material layer and the second active material layer, wherein the electrolyte layer reacts with the first active material layer and the second active material layer; The solvent in the electrolyte layer is consumed during the reaction process, so that the expansion frame is pressed together under the atmospheric pressure, thereby connecting the first conductive layer and the second conductive layer to each other.

3. The printed thin film battery according to claim 2, characterized in that: The first active material layer and the second active material layer are both provided with a concave-convex structure, and the first active material layer and the second active material layer are interlocked and connected with each other through the concave-convex structure.

4. The printed thin film battery according to claim 2, characterized in that: The first conductive layer and the second conductive layer are both provided with a concave-convex structure, and the first conductive layer and the second conductive layer are mutually interlocked and connected through the concave-convex structure; the first active material layer is arranged in the gap between the concave-convex surface of the first conductive layer, and the second active material layer is arranged in the gap between the concave-convex surface of the second conductive layer.

5. The printed thin film battery according to claim 2, characterized in that: The printed thin film battery comprises a battery main body area and a conductive connection area, the expansion frame is arranged in the conductive connection area, and the battery main body of the printed thin film battery is arranged in the battery main body area; wherein the battery main body area adopts a metal composite film substrate, and the conductive connection area adopts a polymer substrate or a metal composite film substrate.

6. The printed thin film battery according to claim 5, characterized in that: The battery body includes a first electrode layer and a second electrode layer, wherein the first electrode layer is arranged at the same polarity as the first active material layer, and the second electrode layer is arranged at the same polarity as the second active material layer; or, the first electrode layer has opposite polarity to the first active material layer, and the second electrode layer has opposite polarity to the second active material layer.

7. The printed thin film battery according to claim 5, characterized in that: A partition frame is provided between the battery main body area and the conductive connection area, or the partition frame is not provided between the battery main body area and the conductive connection area; when the partition frame is not provided between the battery main body area and the conductive connection area, the battery main body area and the conductive connection area both use the metal composite film substrate.

8. The printed thin film battery according to claim 5, characterized in that: The conductive connection area is arranged outside the battery main body area.

9. The printed thin film battery according to claim 5, characterized in that: The conductive connection area is arranged outside the battery main body area, and the conductive connection area surrounds the battery main body area.

10. A battery pack, characterized in that: The invention comprises a plurality of printed thin film batteries as claimed in any one of claims 1 to 9, wherein the plurality of printed thin film batteries are connected in series or in parallel with each other.

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