Gas diffusion partition plate, application and zinc-air battery pack

Abstract

The invention discloses a gas diffusion partition plate, the gas diffusion partition plate is of a wave-shaped long-strip-plate-shaped structure, the gas diffusion partition plate is provided with air holes arranged in an array mode, and the gas diffusion partition plate is placed between two devices with the surfaces needing gas, and the invention further discloses a zinc-air battery pack. Comprising a battery pack shell, gas diffusion partition plates, zinc-air batteries and a battery pack cover body, and the gas diffusion partition plates and the zinc-air batteries are sequentially and repeatedly stacked in the shell; the gas diffusion partition plate not only can provide supporting positions for the two sides, but also can guide air to enter the surface of a device from the periphery of the gas diffusion partition plate, and has the advantages of being easy to machine, low in price, small in thickness and high in gas permeability; according to the zinc-air battery pack, the gas diffusion partition plates are arranged between the zinc-air batteries, the whole zinc-air battery pack is arranged in the shell, the zinc-air battery pack has the characteristics of simplicity in preparation, easiness in processing and high volume energy density, and the scheme is suitable for devices with more than two metal-air battery cells.

Description

Technical Field

[0001] The invention relates to the technical field of zinc-air batteries, and in particular to a gas diffusion separator, application and a zinc-air battery pack. Background Art

[0002] ‌‌‌Gas diffusion baffles are mainly used to separate two planar devices, allowing air to be introduced into the device surface along the cross section. This product is rarely used in life, but there is a great demand for its use in the field of metal-air batteries. The waterproof and breathable membrane used in zinc-air batteries can conduct air on the surface of the battery to the surface of the catalytic membrane, but it cannot introduce air from the cross section of the waterproof and breathable membrane into the interior. In the use of zinc-air batteries, multiple batteries are often used in series or parallel. During the stacking process of zinc-air batteries, they cannot be stacked together without gaps, and gas transmission channels need to be retained. For this reason, we need support sites and gas diffusion channels on the surface of the metal-air positive electrode.

[0003] In the existing technology, the most easily conceivable solution is to place porous ceramic plates, foam plates and fabrics between zinc-air batteries to form a battery pack and its devices. However, hard porous ceramic plates are expensive and have complex manufacturing processes; foam plates are mostly closed-cell and difficult to conduct gas; fabrics and other materials are easy for air to penetrate from the surface, but still difficult to penetrate from the cross-section to the inside. Summary of the invention

[0004] Based on this, it is necessary to provide a lightweight, cheap and practical gas diffusion partition, application and zinc-air battery pack that can separate zinc-air batteries and introduce gas into the surface of zinc-air batteries to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gas diffusion baffle having a wavy cross-section and a plate-like structure on the front side, wherein the gas diffusion baffle forms wave peaks that are alternately staggered and protruded outward on the front and back sides respectively, and gas diffusion channels are formed in the grooves between adjacent wave peaks on the back and front sides respectively, and support positions are formed on the outer sides of the wave peaks on the front and back sides, which are the first support position and the second support position respectively.

[0006] Furthermore, in order to increase the gas diffusion property of the gas diffusion baffle, the gas diffusion baffle also includes air holes arranged in an array, the air holes penetrate the front and back sides of the gas diffusion baffle to form another gas diffusion channel, and the air holes are distributed on the surface between each of the first supporting positions and the second supporting positions.

[0007] The present invention proposes an application based on the above-mentioned gas diffusion baffle, wherein the gas diffusion baffle is placed between two devices whose surfaces require gas, and the gas diffusion baffle is tightly attached to the inner surfaces of the two devices through support positions on both sides to separate the two devices. The gas diffusion baffle guides external air into the diffusion channel through the side, and then diffuses to the surface of the device.

[0008] The present invention also proposes a zinc-air battery pack including the above-mentioned gas diffusion partition, comprising the gas diffusion partition and the zinc-air batteries alternately stacked in sequence in the battery pack shell, the battery pack shell comprising a battery pack shell cover and a battery pack shell body, a plurality of the zinc-air batteries are combined in series or in parallel to form a zinc-air battery pack, the battery pack shell contains shell air holes on the side, and the diffusion channel of the gas diffusion partition is in contact with the shell air holes.

[0009] Furthermore, the battery pack cover comprises a circuit protection board and a socket, and the tabs of the zinc-air battery are connected in series or in parallel and then welded to the circuit protection board inside the battery pack cover.

[0010] Furthermore, the gas diffusion partitions on both sides of the zinc-air battery are placed in a mirror-symmetrical manner.

[0011] Furthermore, the air holes of the shell are in a strip array structure.

[0012] Furthermore, the zinc-air battery is composed of a zinc-air battery cell with a double-sided positive electrode. The zinc-air battery contains two positive electrodes and one negative electrode. The two zinc-air battery cells with single-sided positive electrodes are placed in a "back-to-back" form, with the negative electrodes close together on one side and the positive electrodes at both ends. The two zinc-air batteries are connected in series.

[0013] The beneficial effects of the present invention are as follows: the above-mentioned gas diffusion baffle presents a wavy plate structure and contains air holes arranged in an array, which provides abundant supporting sites for the devices on both sides; the wavy structure is tangent to the devices on both sides, and the contact area can be ignored, which does not affect the performance of the devices on both sides; the wavy structure provides a gas diffusion channel, so that the gas can diffuse into the interior from two cross sections; the air holes arranged in an array further increase the gas diffusion channel, so that the gas can diffuse into the interior from four directions; the air holes arranged in an array also increase the internal air convection; the gas diffusion baffle also has the characteristics of simple preparation process, light weight and practicality.

[0014] The zinc-air battery pack prepared by using the gas diffusion separator has the characteristics of simple structure, easy assembly, simple preparation and high energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the gas diffusion baffle.

[0016] Figure 2 Schematic diagram of the exploded structure of a battery pack.

[0017] Figure 3 Schematic diagram of the explosion of the battery and gas diffusion partition from the side.

[0018] Figure 4 Single-sided zinc-air battery structure.

[0019] Figure 5 Double-sided zinc-air battery structure.

[0020] The following are the descriptions of the reference numerals: 10: battery pack shell cover; 20: zinc-air battery; 21: positive electrode; 22: negative electrode; 30: gas diffusion partition; 31: gas diffusion hole 32: first diffusion channel; 33 second diffusion channel; 34 first support position; 35 second support position; 40: battery pack shell body; 41 shell air vent. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The embodiment of the present invention provides a gas diffusion baffle 30, such as Figure 1 As shown, the gas diffusion baffle 30 is a wavy plate structure with a wavy curve in cross section. The gas diffusion baffle 30 includes a first support position 34 and a second support position 35 . The gas diffusion baffle 30 includes gas diffusion holes 31 arranged in an array.

[0023] Preferably, the gas diffusion baffle 30 can be made of materials such as plastic and cardboard.

[0024] Preferably, the gas diffusion baffle 30 can be prepared by vacuum forming, injection molding, hot pressing and other processes.

[0025] Preferably, the thickness of the gas diffusion separator 30 is between 0.01-5 mm.

[0026] It can be understood that the first support position 34 of the gas diffusion partition 30 can provide a support position for the sheet structure on one side, and the second support position 35 of the gas diffusion partition 30 can provide a support position for the sheet structure on the other side.

[0027] It can be understood that the wavy cross section can facilitate the gas to diffuse inward along the first diffusion channel 32 ; and the array of gas diffusion holes 31 can allow the gas to reach the material surface along the second diffusion channel 33 .

[0028] It can be understood that the array-arranged gas diffusion holes 31 can also increase the gas flow inside the gas diffusion partition 30 .

[0029] The present invention proposes an application of a gas diffusion baffle, which is placed between two devices whose surfaces require gas. The gas diffusion baffle can separate the devices and guide external air to diffuse to the device surface along the four sides of the baffle.

[0030] The embodiment of the present invention further provides a zinc-air battery pack, comprising a gas diffusion separator, a zinc-air battery and a battery pack shell, wherein the gas diffusion separator and the zinc-air battery are repeatedly stacked in sequence and placed in the battery pack shell, and the battery pack shell has air holes.

[0031] A zinc-air battery pack, such as Figure 2 As shown, it includes a gas diffusion partition 30, a zinc-air battery 20 and a battery pack shell, wherein the battery pack shell includes a battery pack shell cover 10 and a battery pack shell body 40. The zinc-air battery pack structure is composed of a plurality of zinc-air batteries 20 connected in series or in parallel. In the zinc-air battery pack structure, each zinc-air battery 20 is separated by a gas diffusion partition 30. The battery pack shell body 40 contains shell vents 41, and the battery pack shell cover 10 includes a circuit board and required jacks.

[0032] like Figure 1 As shown, in the embodiment of the present invention, the battery pack housing body 40 is a rectangular housing with a downward depression in the middle, and housing air holes 41 are provided on both sides of the housing.

[0033] Preferably, the housing air holes 41 may be a strip-shaped rectangular structure, or an array of round holes or square holes.

[0034] It is understandable that the battery pack housing body 40 may have ventilation holes only on two sides, or may have ventilation holes on all sides.

[0035] Preferably, the shell has a thickness between 0.01 and 10 mm, and is made of ordinary plastic.

[0036] Furthermore, if Figure 3 As shown, the zinc-air battery 20 and the gas diffusion separator 30 are stacked in sequence and then placed at the bottom of the battery pack shell body 40 , and the cross section of the gas diffusion separator 30 is in contact with the shell vent 41 of the battery pack shell body 40 .

[0037] Furthermore, the battery pack cover 10 includes a circuit protection board and a socket. The tabs of the zinc-air battery 20 are connected in series or in parallel and then welded to the circuit protection board in the battery pack cover 10 , and then covered on the battery pack housing body 40 .

[0038] Preferably, if Figure 3 As shown, the gas diffusion separators 30 on both sides of the zinc-air battery 20 are placed in a mirror-symmetrical manner to prevent the gas diffusion separators 30 from damaging the zinc-air battery 20.

[0039] Furthermore, the zinc-air battery can be a soft-pack zinc-air battery or a zinc-air battery without a shell.

[0040] In one embodiment, the zinc-air battery cell is composed of a zinc-air battery cell with a double-sided positive electrode, such as Figure 4 As shown, the zinc-air battery contains two positive electrodes 21 and one negative electrode 22.

[0041] In another embodiment, Figure 5 As shown, the zinc-air battery 20 is composed of two zinc-air batteries with single-sided positive electrodes placed in a "back-to-back" manner, with the negative electrodes close together and the positive electrodes at both ends. Such two zinc-air batteries can be connected in series.

[0042] It can be understood that this series structure can increase the power density of the battery pack.

[0043] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims, and the description and drawings can be used to interpret the content of the claims.

Claims

1. A gas diffusion baffle, characterized in that: The gas diffusion baffle has a wavy cross-section and a plate-like structure on the front side. The gas diffusion baffle forms wave peaks that are alternately staggered and protruded outward on the front and back sides, and forms gas diffusion channels in the grooves between adjacent wave peaks on the back and front sides, respectively. Support positions are formed on the outer sides of the wave peaks on the front and back sides, which are the first support position and the second support position, respectively.

2. A gas diffusion baffle according to claim 1, characterized in that: The gas diffusion baffle also includes air holes arranged in an array, and the air holes penetrate the front and back sides of the gas diffusion baffle to form another gas diffusion channel. The air holes are distributed on the surface between each first supporting position and the second supporting position.

3. An application of the gas diffusion baffle according to any one of claims 1 to 2, characterized in that: The gas diffusion baffle is placed between two devices whose surfaces require gas. The gas diffusion baffle is tightly attached to the inner surfaces of the two devices through the support positions on both sides to separate the two devices. The gas diffusion baffle guides external air into the diffusion channel through the side and then diffuses to the surface of the device.

4. A zinc-air battery pack comprising the gas diffusion separator according to any one of claims 1 to 2, comprising a gas diffusion separator, a zinc-air battery and a battery pack casing, characterized in that: The gas diffusion partitions and zinc-air batteries are alternately stacked in sequence and placed in the battery pack shell. The battery pack shell includes a battery pack shell cover and a battery pack shell body. A plurality of zinc-air batteries are connected in series or in parallel to form a zinc-air battery pack. The battery pack shell contains shell air holes on the side, and the diffusion channels of the gas diffusion partitions are in contact with the shell air holes.

5. A zinc-air battery pack according to claim 4, characterized in that: The battery pack cover comprises a circuit protection board and a socket, and the tabs of the zinc-air battery are connected in series or in parallel and then welded to the circuit protection board inside the battery pack cover.

6. A zinc-air battery pack according to claim 4, characterized in that: The gas diffusion partitions on both sides of the zinc-air battery are placed in a mirror-symmetrical manner.

7. A zinc-air battery pack according to claim 4, characterized in that: The air holes of the shell are in a strip array structure.

8. A zinc-air battery pack according to claim 4, characterized in that: The zinc-air battery is composed of a zinc-air battery monomer with a double-sided positive electrode, and the zinc-air battery contains two positive electrodes and one negative electrode.

9. A zinc-air battery pack according to claim 4, characterized in that: The zinc-air battery is composed of two zinc-air batteries with single-sided positive electrodes placed in a "back-to-back" manner, with the negative electrodes close together and the positive electrodes at both ends, and the two zinc-air batteries are connected in series.

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