Flow battery packaging method

Abstract

The invention discloses a flow battery packaging method which comprises the following steps: step 1, uniformly spraying hot melt adhesive layers on two sides of all electrode frames respectively to obtain an adhesive frame assembly A; 2, the hot melt adhesive layers on the two sides of the rubber frame assemblies A are heated to the bonding temperature, proton membranes are bonded between every two adjacent rubber frame assemblies A through the hot melt adhesive layers in a press fit mode, and bipolar plates are bonded on the two sides, away from each other, of the two rubber frame assemblies A located on the outermost side through the hot melt adhesive layers in a press fit mode; and meanwhile, a carbon felt is mounted in the frame body of the rubber frame assembly A, so that the flow battery packaging structure is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packaging, and in particular to a liquid flow battery packaging method. Background Art

[0002] A flow battery is a device that converts chemical energy into electrical energy through electrochemical reactions. It has the advantages of high energy density, long cycle life, and high safety, and is widely used in large-scale energy storage systems.

[0003] Traditional flow battery packaging technology mainly uses a hot-pressing bonding process, which heats and presses the hot-melt adhesive layers of all battery packs in a flow battery at the same time through heat conduction to form a seal, so as to ensure the sealing and stability of the flow battery. Although this process can quickly realize the packaging of the flow battery, it has the following problems:

[0004] 1. The traditional hot pressing bonding process uses heat conduction heating, which has low heating efficiency and high energy consumption. In addition, when the number of battery packs of the packaged liquid flow battery is large, a large thermal pressure is required to ensure the stability of the bonding between the battery packs, which may cause deformation and cracking of the bipolar plate.

[0005] 2. Heating by heat conduction completes the heating and packaging of the hot melt adhesive layer of all battery packs at one time, which can easily lead to uneven heating of the hot melt adhesive layer in different parts, affecting the bonding effect. At the same time, the upper limit of packaging is low, and multiple packaging may be required to meet the demand, resulting in high production costs. In addition, the simultaneous hot pressing packaging of multiple battery packs is not easy to achieve automation and large-scale production.

[0006] Therefore, it is necessary to provide a liquid flow battery packaging method to solve the problems mentioned in the above background technology. Summary of the invention

[0007] To achieve the above object, the present invention provides the following technical solution: a flow battery packaging method, comprising the following steps:

[0008] Step 1: Evenly spray a hot melt adhesive layer on both sides of all electrode frames to obtain an adhesive frame assembly A;

[0009] Step 2: Heat the hot melt adhesive layer on both sides of the adhesive frame assembly A to the bonding temperature, use the hot melt adhesive layer to press and bond the proton membrane between the two adjacent adhesive frame assemblies A, and use the hot melt adhesive layer to press and bond the bipolar plates on both sides of the two outermost adhesive frame assemblies A that are far away from each other; at the same time, install carbon felt in the frame of the adhesive frame assembly A to obtain a liquid flow battery packaging structure.

[0010] Preferably, the step 2 comprises:

[0011] 2.1. Take a glue frame assembly A, denoted as the first glue frame assembly, heat the hot melt adhesive layer on one side of the first glue frame assembly to the bonding temperature, and press and bond the bipolar plate on the heated hot melt adhesive layer to obtain a plate frame assembly B;

[0012] 2.2. Installing carbon felt in the frame of the plate frame assembly B, heating the hot melt adhesive layer on the other side of the first adhesive frame assembly to the bonding temperature, and bonding a proton membrane to the heated hot melt adhesive layer to obtain assembly C;

[0013] 2.3. Take another of the above-mentioned rubber frame components A, record it as the second rubber frame component, heat the hot melt adhesive layer on one side of the second rubber frame component to the bonding temperature, press and bond the second rubber frame component to the hot melt adhesive layer on one side of the proton membrane of the component C, and install carbon felt in the bonded second rubber frame component to obtain component D;

[0014] 2.4. Heat the hot melt adhesive layer on the other side of the second adhesive frame assembly to the bonding temperature, and bond the bipolar plates to obtain the liquid flow battery packaging structure.

[0015] Preferably, the step 2.3 further comprises:

[0016] According to the quantity requirement of liquid flow battery packs, the hot melt adhesive layers on the outer sides of several components D are heated and bonded to each other in sequence to obtain components D'; the bipolar plate side and the second glue frame component side of two adjacent components D are bonded to each other.

[0017] Preferably, the bonding temperature of the hot melt adhesive layer is 100-160°C.

[0018] Preferably, the hot melt adhesive layer is a polyolefin hot melt adhesive layer.

[0019] Preferably, the size of the proton membrane is larger than the inner frame size of the hot melt adhesive layer, and smaller than the outer frame size of the hot melt adhesive layer.

[0020] Preferably, the spraying thickness of the hot melt adhesive layer in step 1 is 0.1-1 mm.

[0021] Preferably, the heating is performed using infrared heating equipment.

[0022] Compared with the prior art, the present invention provides a liquid flow battery packaging method, which has the following beneficial effects:

[0023] 1. In the present invention, multiple components are provided to package the flow battery in steps, which makes it easy to realize the automation and large-scale production of the hot pressing bonding process, and increases the upper limit of the number of flow battery packaging battery packs, reduces the error and rework rate of flow battery packaging, improves product quality, and reduces production costs;

[0024] 2. In the present invention, an infrared heating device is provided to replace the traditional hot pressing device, and a non-contact heating method is adopted to carry out targeted heating of the hot melt adhesive layer that plays a bonding and sealing role, and does not heat the bipolar plates, pole frames, carbon felt, proton membranes and other materials, thereby reducing the deformation and cracking of the bipolar plates and the energy loss during hot pressing bonding, improving the stability of the product, and at the same time, being able to ensure that each hot melt adhesive layer is fully heated, avoiding the problem of inconsistent heating temperatures of the hot melt adhesive layers in various parts of a hot pressing packaging molding process, and ensuring the bonding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall exploded structure of the flow battery;

[0026] Figure 2 This is a schematic diagram of the side structure of the flow battery rubber frame assembly A;

[0027] Figure 3 This is a schematic diagram of the exploded structure of the plate frame assembly B of the flow battery;

[0028] Figure 4 It is a schematic diagram of the exploded structure of the flow battery component C;

[0029] Figure 5 It is a schematic diagram of the exploded structure of the flow battery component D;

[0030] In the figure: 1. Bipolar plate; 2. Carbon felt; 3. Hot melt adhesive layer; 4. Electrode frame; 5. Proton membrane. DETAILED DESCRIPTION

[0031] See also Figure 1-5 The present invention provides a method for packaging a liquid flow battery, comprising the following steps:

[0032] Step 1: Evenly spray a hot melt adhesive layer 3 on both sides of all electrode frames 4 to obtain an adhesive frame assembly A;

[0033] Step 2: Heat the hot melt adhesive layer 3 on both sides of the glue frame component A to the bonding temperature, use the hot melt adhesive layer 3 to press and bond the proton membrane 5 between the two adjacent glue frame components A, and use the hot melt adhesive layer 3 to press and bond the bipolar plate 1 on both sides of the two outermost glue frame components A that are far away from each other; at the same time, install the carbon felt 2 in the frame of the glue frame component A to obtain the liquid flow battery packaging structure.

[0034] In this embodiment, a dispensing machine is used for hot melt adhesive spraying, the spraying thickness of the hot melt adhesive layer 3 is 0.1-1 mm, the bonding temperature of the hot melt adhesive layer 3 is 100-160° C., and the shape of the hot melt adhesive layer 3 is the same as the corresponding end face shape of the electrode frame 4.

[0035] Furthermore, the step 2 includes:

[0036] 2.1. Take a glue frame assembly A, denoted as the first glue frame assembly, heat the hot melt adhesive layer 3 on one side of the first glue frame assembly to the bonding temperature, and press and bond the bipolar plate 1 on the heated hot melt adhesive layer 3 to obtain a plate frame assembly B;

[0037] 2.2. Install the carbon felt 2 in the frame of the plate frame assembly B, heat the hot melt adhesive layer 3 on the other side of the first adhesive frame assembly to the bonding temperature, and bond the proton membrane 5 on the heated hot melt adhesive layer 3 to obtain assembly C;

[0038] 2.3. Take another of the above-mentioned rubber frame components A, record it as the second rubber frame component, heat the hot melt adhesive layer 3 on one side of the second rubber frame component to the bonding temperature, press and bond the second rubber frame component to the hot melt adhesive layer 3 on one side of the proton membrane 5 of the component C, and install the carbon felt 2 in the bonded second rubber frame component to obtain component D;

[0039] 2.4. Heat the hot melt adhesive layer 3 on the other side of the second adhesive frame assembly to the bonding temperature, and bond the bipolar plate 1 to obtain the liquid flow battery packaging structure.

[0040] In this embodiment, infrared heating equipment is used for heating. This heating method is non-contact. Compared with the contact heating of traditional hot pressing equipment, it can heat the hot melt adhesive layer 3 of each battery pack in a targeted manner, with high heating efficiency and low energy loss.

[0041] In this embodiment, the infrared heating device is equipped with a laser temperature sensor to facilitate accurate control of the heating temperature of the hot melt adhesive layer 3 .

[0042] In this embodiment, the size of the proton membrane 5 is larger than the inner frame size of the hot melt adhesive layer 3 and smaller than the outer frame size of the hot melt adhesive layer 3, which facilitates the bonding of the hot melt adhesive layer 3 on the side of the proton membrane 5 with other components.

[0043] It should be explained that when the proton membrane 5 is bonded to the hot melt adhesive layer 3 heated to the bonding temperature, the proton membrane 5 is placed in the center of the melted hot melt adhesive surface for bonding, and the temperature of the melted hot melt adhesive surface is kept at the bonding temperature to make the proton membrane 5 and the hot melt adhesive layer 3 merge into one, thereby completing the production of component C.

[0044] Furthermore, the step 2.3 also includes:

[0045] According to the quantity requirement of liquid flow battery pack, the hot melt adhesive layers 3 on the outer sides of several components D are heated and bonded to each other in sequence to obtain components D'; the bipolar plate 1 side and the second adhesive frame component side of two adjacent components D are bonded to each other.

[0046] Specifically, assuming that the number of flow battery packs to be packaged is N, N-1 components D are sequentially stacked and bonded on the basis of the initial component D.

[0047] Preferably, the spraying thickness of the hot melt adhesive layer 3 is 0.3 mm, the bonding temperature of the hot melt adhesive layer 3 is 140° C., and the hot melt adhesive layer 3 is a polyolefin hot melt adhesive layer.

[0048] In this embodiment, the traditional hot-pressing bonding process of liquid flow batteries, which requires heat conduction heating of the entire battery pack during one-time hot-pressing packaging, is improved to prepare the packaging of the liquid flow battery in steps in the form of components, thereby reducing the error and rework rate of the liquid flow battery packaging and improving the product quality; at the same time, an infrared heating device is used to heat the hot-melt adhesive layer 3 of each component in a targeted manner to ensure that each hot-melt adhesive layer 3 can be fully heated to ensure its bonding effect, reduce energy consumption, avoid the problem of inconsistent heating temperature of the hot-melt adhesive layer 3 in each part of the one-time hot-pressing packaging (the temperature of the hot-melt adhesive layer 3 on the outside of the liquid flow battery pack is high, and the temperature in the middle is low), and avoid the problem of deformation and cracking of the bipolar plate 1 during traditional hot-pressing bonding; in addition, the liquid flow battery is gradually packaged in the form of components, which can increase the upper limit of the number of battery packs packaged in the liquid flow battery, and avoid the problem that when the number of battery packs exceeds a certain level during the traditional hot-pressing bonding process of liquid flow batteries, the temperature of the hot-melt adhesive layer 3 in the middle position will be reduced to the point where it is impossible to form a bonding seal, and it can only be packaged multiple times to meet the requirements, thereby reducing the production cost.

[0049] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for packaging a flow battery, characterized in that: The following steps are involved: Step 1: Evenly spray a hot melt adhesive layer (3) on both sides of all electrode frames (4) to obtain an adhesive frame assembly A; Step 2: heating the hot melt adhesive layers (3) on both sides of the adhesive frame assembly A to a bonding temperature, using the hot melt adhesive layers (3) to press and bond the proton membrane (5) between two adjacent adhesive frame assemblies A, and using the hot melt adhesive layers (3) to press and bond the bipolar plates (1) on both sides of the two outermost adhesive frame assemblies A that are away from each other; and simultaneously installing the carbon felt (2) in the frame of the adhesive frame assembly A to obtain a liquid flow battery packaging structure.

2. A method for packaging a liquid flow battery according to claim 1, characterized in that: The second step comprises: 2).

1. Take a glue frame assembly A, denoted as the first glue frame assembly, heat the hot melt adhesive layer (3) on one side of the first glue frame assembly to a bonding temperature, and press and bond the bipolar plate (1) on the heated hot melt adhesive layer (3) to obtain a plate frame assembly B; 2).

2. Install the carbon felt (2) in the frame of the plate frame assembly B, heat the hot melt adhesive layer (3) on the other side of the first adhesive frame assembly to the bonding temperature, and bond the proton membrane (5) on the heated hot melt adhesive layer (3) to obtain assembly C; 2).

3. Take another of the above-mentioned rubber frame components A, record it as the second rubber frame component, heat the hot melt adhesive layer (3) on one side of the second rubber frame component to the bonding temperature, press and bond the second rubber frame component to the hot melt adhesive layer (3) on one side of the proton membrane (5) of the component C, and install the carbon felt (2) in the bonded second rubber frame component to obtain component D; 2).

4. Heat the hot melt adhesive layer (3) on the other side of the second adhesive frame assembly to the bonding temperature, and bond the bipolar plate (1) to obtain the liquid flow battery packaging structure.

3. A method for packaging a liquid flow battery according to claim 2, characterized in that: The step 2.3 also includes: According to the quantity requirement of the liquid flow battery pack, the hot melt adhesive layers (3) on the outer sides of a plurality of the components D are heated and sequentially bonded to each other to obtain a component D'; and the bipolar plate (1) side and the second adhesive frame component side of two adjacent components D are bonded to each other.

4. A method for packaging a liquid flow battery according to any one of claims 1 to 3, characterized in that: The bonding temperature of the hot melt adhesive layer (3) is 100-160°C.

5. A method for packaging a liquid flow battery according to any one of claims 1 to 3, characterized in that: The hot melt adhesive layer (3) is a polyolefin hot melt adhesive layer.

6. A method for packaging a liquid flow battery according to any one of claims 1 to 3, characterized in that: The size of the proton membrane (5) is larger than the inner frame size of the hot melt adhesive layer (3), and smaller than the outer frame size of the hot melt adhesive layer (3).

7. A method for packaging a liquid flow battery according to any one of claims 1 to 3, characterized in that: The spraying thickness of the hot melt adhesive layer (3) in step 1 is 0.1-1 mm.

8. A method for packaging a liquid flow battery according to any one of claims 1 to 3, characterized in that: The heating is performed using infrared heating equipment.

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