Thin film battery containing etched metal layer, battery pack and electric appliance

Abstract

The utility model discloses a thin film battery containing an etched metal layer, a battery pack and an electric appliance, and relates to the technical field of thin film batteries. The thin film battery containing the etched metal layer comprises a positive pole piece, a negative pole piece and an electrolyte, each of the positive pole piece and the negative pole piece comprises a current collector layer and an etched pattern metal layer; wherein the current collector layer comprises a body part; the etched pattern metal layer comprises a tab part and a pattern part, the body part is arranged on the surface of the pattern part, the pattern part is in contact with the body part to form electric connection, and the pattern part is electrically connected with the tab part. The structure of the thin film battery provided by the utility model adopts the etched pattern metal layer, the internal connection is good, the mechanical property is good, and the design of the pattern part and the tab part in the structure is convenient for industrial manufacturing.

Description

Technical Field

[0001] The utility model relates to the technical field of thin-film batteries, and particularly relates to a thin-film battery with an etched metal layer, a battery pack and an electrical appliance. Background Art

[0002] Due to the thickness limitation of printed thin-film batteries, the internal resistance of electrons in the current collector layer (such as carbon) during lateral conduction is very large. For high-power devices, a large battery internal resistance will have a negative impact on battery performance. Summary of the Utility Model

[0003] The main purpose of the utility model is to propose a thin-film battery with an etched metal layer, a battery pack and an electrical appliance, aiming to solve the technical problem of large internal resistance of thin-film batteries in the prior art.

[0004] To achieve the above purpose, in the first aspect, the utility model proposes a thin-film battery with an etched metal layer, including a positive electrode plate, a negative electrode plate and an electrolyte; both the positive electrode plate and the negative electrode plate include a current collector layer and an etched pattern metal layer; wherein, the current collector layer includes a body part; the etched pattern metal layer includes a tab part and a pattern part, the body part is arranged on the surface of the pattern part, the pattern part is in contact with the body part to form an electrical connection, and the pattern part is electrically connected to the tab part.

[0005] In some embodiments, the pattern part arranged on the surface of the body part of the current collector layer of the positive electrode plate is a first pattern part, and the pattern part arranged on the surface of the body part of the current collector layer of the negative electrode plate is a second pattern part. The first pattern part is arranged along the edge of the corresponding body part, and the second pattern part is a two-dimensional pattern arranged on the corresponding body part.

[0006] In some embodiments, the tab part and the pattern part are connected to each other, and the tab part and the pattern part are of an integral structure.

[0007] In some embodiments, the current collector layer further includes a tab setting area connected to the body part. The tab setting area is arranged on the surface of the tab part. The tab part and the pattern part are not connected to each other, and the tab part and the pattern part are electrically connected through the current collector layer.

[0008] In some embodiments, the first pattern part is in a frame shape, the second pattern part is in a block shape or a grid shape, and / or

[0009] the contact surface between the etched pattern metal layer and the current collector layer is a reduced-state metal, and / or

[0010] The etched pattern metal layer is an etched metal foil, and / or,

[0011] A hydrophobic conductive layer is further provided between the current collector layer and the etched pattern metal layer; and / or,

[0012] The thin film battery further includes a sealing frame, and a part of the projection position of the first pattern part and the sealing frame in the vertical direction overlaps.

[0013] In some embodiments, the thin film battery has a sandwich structure, the positive electrode sheet and the negative electrode sheet are stacked in the vertical direction, the first pattern part and the second pattern part are disposed on different insulating substrates and are in contact with the positive electrode sheet and the negative electrode sheet respectively, and the projection positions of the first pattern part and the second pattern part in the vertical direction do not overlap.

[0014] In some embodiments, the thin film battery has a coplanar structure, the positive electrode sheet and the negative electrode sheet are disposed on the same horizontal plane, the first pattern part and the second pattern part are disposed on the same insulating substrate and are in contact with the positive electrode sheet and the negative electrode sheet respectively.

[0015] In a second aspect, the present invention provides a battery pack, which includes a plurality of thin film batteries according to the first aspect of the present invention. The plurality of thin film batteries are arranged in series or in parallel, and the thin film batteries are electrically connected through a partially extended current collector layer and / or a partially extended etched pattern metal layer; the projection positions of the partially extended etched pattern metal layer in the vertical direction do not overlap.

[0016] In a third aspect, the present invention provides an electrical appliance, which includes the thin film battery according to the first aspect of the present invention or the battery pack according to the second aspect of the present invention.

[0017] In some embodiments, the electrical appliance includes a thin film battery, the thin film battery includes an insulating substrate, and a region and an extended region of the etched pattern metal layer in contact with the current collector layer are provided on one side surface of the insulating substrate. A first metal etching structure is provided on the extended region, and / or,

[0018] A second metal etching structure is provided on the other side surface of the insulating substrate, and a metal connecting member is penetrated through the insulating substrate. The metal connecting member is connected to the etched pattern metal layer and the second metal etching structure.

[0019] The technical solution of the present invention increases the conductivity and reduces the internal resistance of the thin film battery by using an etched pattern metal layer provided on the current collector layers of the positive electrode sheet and the negative electrode sheet. At the same time, the structure of the thin film battery provided by the present invention uses an etched pattern metal layer, which has good internal connection and good mechanical properties. The design of the pattern part and the tab part in this structure is convenient for industrial manufacturing. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1 It is a schematic structural diagram of an embodiment of a thin-film battery with an etched metal layer provided by the present invention;

[0022] Figure 2 Provided by the present invention Figure 1 It is a schematic plan view of an etched pattern metal layer and a current collector layer;

[0023] Figure 3 It is a schematic side view of another thin-film battery with an etched metal layer provided by the present invention;

[0024] Figure 4 Provided by the present invention Figure 3 It is a schematic plan view of an etched pattern metal layer and a current collector layer;

[0025] Figure 5 It is a schematic plan view of an etched pattern metal layer and a current collector layer in a battery pack of a thin-film battery with an etched metal layer provided by the present invention;

[0026] Figure 6 It is a schematic plan view of another etched pattern metal layer and a current collector layer in a battery pack of a thin-film battery with an etched metal layer provided by the present invention.

[0027] Explanation of the Reference Numerals in the Drawings:

[0028] 1. Insulating base layer; 2. Etched pattern metal layer; 3. Current collector layer; 4. Positive electrode material layer; 5. Electrolyte layer; 6. Negative electrode material layer; 7. Sealing frame; 201. Pattern part; 202. Tab part; 201a. First pattern part; 201b. Second pattern part; 301. Body part; 302. Tab setting area; 8. Partially extended etched pattern metal layer.

[0029] The realization of the objectives, functional features, and advantages of the present invention will be further described in conjunction with the embodiments with reference to the drawings. Detailed Embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0031] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] Due to the thickness limitation of the printed thin-film battery, the internal resistance of electrons in the current collector layer (such as carbon) for lateral conduction is very large. For high-power devices, a large battery internal resistance will have a negative impact on battery performance.

[0034] In view of this, please refer to Figures 1 to 6 , in a first aspect, an embodiment of the present invention provides a thin-film battery including an etched metal layer, which includes a positive electrode plate, a negative electrode plate, and an electrolyte; both the positive electrode plate and the negative electrode plate include a current collector layer 3 and an etched pattern metal layer 2; wherein, the current collector layer 3 includes a body part 301; the etched pattern metal layer 2 includes a tab part 202 and a pattern part 201, the body part 301 is disposed on the surface of the pattern part 201, the pattern part 201 is in contact with the body part 301 to form an electrical connection, and the pattern part 201 is electrically connected to the tab part 202.

[0035] The technical solution of the present utility model increases the electrical conductivity and reduces the internal resistance of the thin-film battery by adopting an etched-pattern metal layer 2 provided on the current collector layers 3 of the positive and negative electrode plates. At the same time, the structure of the thin-film battery provided by the present utility model adopts an etched-pattern metal layer 2, which has good internal connection and mechanical properties. The design of the pattern part 201 and the tab part 202 in this structure facilitates industrial manufacturing.

[0036] It should be noted that in the present utility model, the etched-pattern metal layer 2 may refer to a metal layer with a two-dimensional pattern formed by etching a whole piece of metal (such as a metal foil, etc.) using an acid solution or the like.

[0037] In the present utility model, it is considered that the internal resistance of the thin-film battery can be reduced by additionally adding a current collector layer 3 (such as a metal wire, a grid, etc.). For the metal current collector, although the additionally added current collector layer 3 can be provided on the conventional current collector layer 3 by means of printing silver paste, copper paste, etc. However, for silver paste, its cost is relatively high; for copper paste, it is easily oxidized. Therefore, the printing method has defects such as high manufacturing cost and easy oxidation of the printed current collector layer 3. And for printing ink, the metal needs to be powdered, and then mixed with a binder and a solvent. There may be pores in the connection of the printed metal particles, while in the present utility model, the metal inside the etched-pattern metal layer has good internal connection and good mechanical properties.

[0038] In an embodiment of the present utility model, the pattern part on the surface of the body part 301 of the current collector layer 3 provided on the positive electrode plate is the first pattern part 201a, and the pattern part on the surface of the body part 301 of the current collector layer 3 provided on the negative electrode plate is the second pattern part 201b. The first pattern part 201a is arranged along the edge of the corresponding body part 301, and the second pattern part 201b is a two-dimensional pattern provided on the corresponding body part 301.

[0039] In an embodiment of the present utility model, the first pattern part 201a is in a frame shape, and the second pattern part 201b is in a block shape or a grid shape.

[0040] The contact surface between the etched-pattern metal layer and the current collector layer 3 is a reduced-state metal. The etched-pattern metal layer is an etched metal foil. After the etched-pattern metal layer 2 is formed, there is usually an insulating dense oxide layer on the surface of the etched-pattern metal layer 2. The oxide layer is corroded, so that the contact surface between the etched-pattern metal layer 2 and the current collector layer 3 is a reduced-state metal, which can reduce the connection internal resistance. Specifically, an appropriate amount of acidic substance can be added to the carbon paste of the current collector layer 3 to corrode the metal oxide layer, but it cannot be excessive to avoid corroding the metal layer. Exemplarily, a weak acid or a weakly acidic substance can be used.

[0041] The positive electrode of the battery is an oxidizing substance, which is prone to oxidizing and etching metals. Therefore, it is preferably placed at the edge, and more preferably set at the position of the rubber frame, so that it cannot even contact the electrolyte. The negative electrode of the battery is a reducing substance, so it can be distributed inside the electrode. Here, it is preferably a monolithic structure or a grid structure to promote electron conduction in two dimensions.

[0042] In an embodiment of the present invention, the tab portion 202 is connected to the pattern portion 201, and the tab portion 202 and the pattern portion 201 are of an integral structure. See Figure 2 , the tab portion 202 and the pattern portion 201 can be of an integral structure. On the one hand, it is convenient to simplify the manufacturing process, and on the other hand, such a setting has better conductivity.

[0043] In an embodiment of the present invention, the current collector layer 3 further includes a tab setting area 302 connected to the body portion 301. The tab setting area 302 is arranged on the surface of the tab portion 202. The tab portion 202 and the pattern portion are not connected to each other, and the tab portion 202 and the pattern portion are electrically connected through the current collector layer 3. See Figure 4 , the tab portion 202 and the pattern portion 201 can also be separately arranged in space. Since the current collector layer 3 (usually a carbon layer) itself has conductivity, the tab portion 202 and the pattern portion 201 can be electrically connected through the current collector layer 3. The advantage of this structure is that the rubber frame seal is better and the electrolyte is not easily leaked out.

[0044] In an embodiment of the present invention, a hydrophobic conductive layer is further arranged between the current collector layer 3 and the etched pattern metal layer. The setting of the hydrophobic conductive layer can prevent the electrolyte from penetrating the etched pattern metal layer.

[0045] In an embodiment of the present invention, the thin-film battery further includes a sealing frame 7, and a part of the projection position of the first pattern portion 201a and the sealing frame 7 overlaps in the vertical direction. The first pattern portion 201a is arranged at the position of the sealing frame 7, which can prevent the electrolyte from contacting the first pattern portion 201a and prevent the electrolyte from penetrating the etched pattern metal layer.

[0046] In an embodiment of the present invention, the thin-film battery is of a sandwich structure. The positive electrode plate and the negative electrode plate are stacked in the vertical direction. The first pattern portion 201a and the second pattern portion 201b are arranged on different insulating substrates and are in contact with the positive electrode plate and the negative electrode plate respectively. The projection positions of the first pattern portion 201a and the second pattern portion 201b do not overlap in the vertical direction.

[0047] See Figure 1, the thin-film battery has a sandwich structure, which includes, from bottom to top, an insulating base layer 1, an etched pattern metal layer 2, a current collector layer 3, a negative electrode material layer 6, an electrolyte layer 5, a positive electrode material layer 4, a current collector layer 3, an etched pattern metal layer 2, and an insulating base layer 1. Among them, a sealing frame 7 is arranged around the outer periphery of the electrolyte layer 5. Considering the thickness uniformity of the battery and also for the flatness of the glue frame position, when the battery is a sandwich structure, the two etched pattern metal layers 2 are preferably staggered from each other, that is, the projection positions of the first pattern part 201a and the second pattern part 201b in the vertical direction do not overlap.

[0048] In an embodiment of the present invention, the thin-film battery has a coplanar structure, the positive electrode plate and the negative electrode plate are arranged on the same horizontal plane, the first pattern part 201a and the second pattern part 201b are arranged on the same insulating substrate and are respectively in contact with the positive electrode plate and the negative electrode plate.

[0049] See Figure 3 , the thin-film battery has a coplanar structure, which includes, from bottom to top, an insulating base layer 1, an etched pattern metal layer 2, a current collector layer 3, a positive electrode material layer 4, a negative electrode material layer 6, an electrolyte layer 5, and an insulating base layer 1. Among them, a sealing frame 7 is arranged around the outer periphery of the electrolyte layer 5.

[0050] In a second aspect, the present invention provides a battery pack, which includes a plurality of thin-film batteries of the first aspect of the present invention. The plurality of thin-film batteries are arranged in series or in parallel, and the thin-film batteries are electrically connected through a partially extended current collector layer and / or a partially extended etched pattern metal layer 8; the projection positions of the partially extended etched pattern metal layer 8 in the vertical direction do not overlap. See Figure 6 , considering the thickness uniformity of the battery, the projection positions of the partially extended etched pattern metal layer 8 in the vertical direction do not overlap.

[0051] In a third aspect, the present invention provides an electrical appliance, and the electrical appliance includes the thin-film battery of the first aspect of the present invention or the battery pack of the second aspect.

[0052] In some embodiments, the electrical appliance includes a thin-film battery. The thin-film battery includes an insulating substrate. On one side surface of the insulating substrate, there are regions of the etched-pattern metal layer in contact with the current collector layer 3 and extension regions. A first metal etching structure is provided on the extension regions. A second metal etching structure is provided on the other side surface of the insulating substrate. A metal connecting member is penetratingly provided on the insulating substrate. The metal connecting member is connected to the etched-pattern metal layer and the second metal etching structure. It should be noted that the second metal etching structure and the etched-pattern metal layer are provided on both sides of the insulating substrate in the thin-film battery. Therefore, during the preparation process, the second metal etching structure and the etched-pattern metal layer can be etched on both sides together, that is, they can be soaked in acid simultaneously after covering the cover plate for etching. Thereby, the preparation process is simplified. Exemplarily, the electrical appliance includes an antenna component of RFID. The metal antenna, the second metal etching structure for the battery, and the etched-pattern metal layer can be etched simultaneously on the same substrate, thereby reducing the production steps of the overall device.

[0053] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A thin film battery containing an etched metal layer, characterized in that: Including positive electrode sheet, negative electrode sheet and electrolyte; The positive electrode plate and the negative electrode plate both include a current collector layer and an etched pattern metal layer; wherein the current collector layer includes a main body portion; the etched pattern metal layer includes a tab portion and a pattern portion, the main body portion is arranged on the surface of the pattern portion, the pattern portion contacts the main body portion to form an electrical connection, and the pattern portion is electrically connected to the tab portion.

2. The thin film battery containing an etched metal layer according to claim 1, characterized in that: The pattern portion arranged on the surface of the main body portion of the collector layer of the positive electrode sheet is the first pattern portion, and the pattern portion arranged on the surface of the main body portion of the collector layer of the negative electrode sheet is the second pattern portion. The first pattern portion is arranged along the edge of the corresponding main body portion, and the second pattern portion is a two-dimensional pattern arranged on the corresponding main body portion.

3. The thin film battery containing an etched metal layer according to claim 1, characterized in that: The pole ear part and the pattern part are connected to each other, and the pole ear part and the pattern part are an integrated structure.

4. The thin film battery containing an etched metal layer according to claim 1, characterized in that: The current collector layer also includes a tab arrangement region connected to the body portion, The pole lug setting area is set on the surface of the pole lug part, the pole lug part and the pattern part are not connected to each other, and the pole lug part and the pattern part are electrically connected through the current collector layer.

5. The thin film battery containing an etched metal layer according to claim 2, characterized in that: The first pattern part is frame-shaped, the second pattern part is block-shaped or grid-shaped, and / or, The contact surface between the etched pattern metal layer and the current collector layer is a reduced metal, and / or, The etched pattern metal layer is an etched metal foil, and / or, A hydrophobic conductive layer is further provided between the current collector layer and the etched pattern metal layer; and / or, The thin film battery further includes a sealing frame, and the first pattern portion partially overlaps with a projection position of the sealing frame in a vertical direction.

6. The thin film battery containing an etched metal layer according to claim 2, characterized in that: The thin film battery has a sandwich structure, the positive electrode sheet and the negative electrode sheet are stacked in a vertical direction, the first pattern portion and the second pattern portion are arranged on different insulating substrates, respectively contacting the positive electrode sheet and the negative electrode sheet, and the first pattern portion and the second pattern portion have no overlapping projection positions in the vertical direction.

7. The thin film battery containing an etched metal layer according to claim 2, characterized in that: The thin film battery has a coplanar structure, the positive electrode sheet and the negative electrode sheet are arranged on the same horizontal plane, the first pattern portion and the second pattern portion are arranged on the same insulating substrate and are in contact with the positive electrode sheet and the negative electrode sheet respectively.

8. A battery pack, characterized in that: It comprises a plurality of thin film batteries containing an etched metal layer as described in any one of claims 1 to 7, wherein the plurality of thin film batteries are arranged in series or in parallel, and the thin film batteries are electrically connected through a partially extended current collector layer and / or a partially extended etched pattern metal layer; the projection positions of the partially extended etched pattern metal layers in the vertical direction do not overlap.

9. An electrical appliance, characterized in that: The electrical appliance comprises a thin film battery comprising an etched metal layer as claimed in any one of claims 1 to 7 or a battery pack as claimed in claim 8.

10. The electrical appliance according to claim 9, characterized in that: The electrical appliance comprises a thin film battery containing an etched metal layer, the thin film battery containing an etched metal layer comprises an insulating substrate, a surface of one side of the insulating substrate is provided with a region of the etched pattern metal layer in contact with the current collector layer and an extension region, a first metal etching structure is provided on the extension region, and / or, A second metal etching structure is disposed on the other side surface of the insulating substrate, and a metal connector is disposed through the insulating substrate, and the metal connector is connected to the etching pattern metal layer and the second metal etching structure.

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