Fixture for all-gel battery assembly test

Abstract

The utility model discloses a fixture for assembling and testing an all-gel battery, relates to a fixture for testing a battery, solves the problem that the assembling and testing of the all-gel battery are inconvenient, comprises a connecting plate, two pressing layers, two screwing pieces, two current collecting pieces, two clamping piece layers and two interlayers, and is characterized in that one end of each pressing layer is connected with the connecting plate through a pin, and the other end of each pressing layer is connected with the other end of each clamping piece layer through a pin; threaded holes are formed in the pressing layers, the screwing pieces are connected with the pressing layers through threads, through holes consistent in specification are formed in the clamping piece layers and the partition layers, the bottom ends of the screwing pieces can pass through the through holes, flow collecting grooves are formed in the clamping piece layers, the flow collecting pieces and the flow collecting grooves are installed in a paired mode, and the two clamping piece layers are installed in gaps of the two pressing layers respectively. And the two interlayers are mounted in the gap between the two clamping piece layers. According to the invention, the assembly of the all-gel battery is more convenient, and the test of the all-gel battery is standardized.

Description

Technical Field

[0001] The present application relates to the technical field of battery testing fixtures, and in particular to a fixture for full gel battery assembly testing. Background Art

[0002] With the popularization of smart terminals and the continuous updating of electronic information technology, consumer electronic products are gradually developing towards miniaturization, integration, and flexible wearability. In addition to meeting the basic functional needs of consumers, the new generation of electronic products must also have multifunctionality, convenience, and flexibility. This requires traditional batteries to develop in a more flexible and safer direction.

[0003] Traditional lithium-ion batteries (LIBs) are composed of four main parts: positive electrode, negative electrode, separator and electrolyte. The positive electrode material is mainly lithium-containing materials, such as LiFePO4, LiMnO2, LiCoO2, etc. Most of the negative electrode materials are lithium-deficient materials, such as C, TiS2, Sn and some active materials that can provide embedded defects for lithium ions, such as manganese, cobalt, and nickel oxides. In the battery, the separator is equivalent to an insulating layer, which prevents the positive and negative electrodes from contacting each other and causing internal short circuits in the battery. The electrolyte is usually formed by dissolving electrolyte salts in high-purity organic solvents. Its function is to transport ions between the positive and negative electrodes, so it is called the "blood" of the battery.

[0004] Here we take typical LIBs as an example to introduce the working principle. + It is continuously released from the LiCoO2 cathode and embedded into graphite to form Li x C6. In order to maintain the charge balance in the system, electrons move from the positive electrode to the negative electrode along the external circuit. Conversely, during the discharge process, Li + It escapes from the graphite layer and is embedded in the positive electrode lattice again. The electrochemical reaction of its charge and discharge process is as follows:

[0005] positive electrode:

[0006] negative electrode:

[0007] Overall reaction:

[0008] The traditional battery structure consists of a metal shell containing positive and negative electrodes, a separator, and an electrolyte. The traditional metal current collection method greatly limits the development of batteries on flexible wearable devices. When the battery is bent, the electrode active material peels off from the current collector, causing cracks on the electrode surface, causing the battery's internal resistance to increase. In order to overcome this problem, researchers mainly use the following two approaches: 1. Improve the mechanical strength between electrode materials so that they can be better and more compactly attached to thinner metal current collector foils; 2. Design an ideal battery structure and simplify the battery design structure so that the battery can be more flexible and adaptable to deformation.

[0009] As the most typical soft material, hydrogel is usually made of a three-dimensional hydrophilic polymer network structure. Therefore, hydrogel has strong water absorption and water retention properties. Generally speaking, the water content in hydrogel accounts for about 90% of its own weight. Hydrogels with self-healing ability can maintain network integrity and potential other properties, such as mechanical strength and elasticity, which is conducive to long-term use. The high water content and microporous structure of hydrogels are conducive to the dispersion of soluble salts, which makes hydrogels have good ionic conductivity. As a carrier medium, hydrogel can have the characteristics of high flexibility, conductivity, water retention and self-healing, and is an ideal design material for flexible wearable devices. Corresponding to the development needs of intelligent flexible wearable devices, a soft battery that not only meets the characteristics of flexible wear but also provides stable output is needed as a power source to ensure the normal operation of the device. Therefore, a gel battery with hydrogel as battery electrode and electrolyte was designed.

[0010] The performance test of conventional battery materials requires packaging them into button batteries, soft-pack batteries or primary batteries according to their material characteristics, and then connecting the electrochemical test system fixture to the positive and negative sides of the battery for testing. The fixture of the conventional electrochemical test system is an alligator clip, which can tightly clamp the battery electrode or battery shell. However, the battery assembled with hydrogel electrodes and electrolytes is soft because of the gel itself. When conventional fixtures are used to clamp gel batteries, the structure of the gel and battery is easily damaged, making it difficult to test the assembled gel batteries. Therefore, it is urgent to design a fixture that is suitable for full gel batteries and can help them measure battery performance. Utility Model Content

[0011] In order to solve the problems of full gel battery performance testing and assembly clamping, the present application provides a fixture for full gel battery assembly testing.

[0012] The present application provides a fixture for full gel battery assembly testing, which adopts the following technical solution:

[0013] A fixture for assembling and testing a full gel battery comprises a connecting plate, two pressing layers, two screwing parts, two current collecting sheets, two sandwich layers and two partitions. The fixture is characterized in that a plug hole is provided on the connecting plate, a latch is provided at one end of the pressing layer, and the pressing layer and the connecting plate are connected by a pin. A threaded hole is provided on the pressing layer, the screwing part is connected to the pressing layer by a thread, through holes of the same specification are provided on the sandwich layer and the partition, and the through holes can be passed through by the bottom end of the screwing part, a gap is formed between the two pressing layers, two current collecting sheets are respectively installed in the gap close to one side of the pressing layer, two sandwich layers are respectively installed in the gap close to one side of the current collecting sheet, and two partitions are respectively installed in the gap close to one side of the sandwich layer.

[0014] By adopting the above technical scheme, the tightening piece is connected to the pressing layer through a thread, the pressing layer and the connecting plate are fixed by a pin, a gap is formed between the two pressing layers, the current collecting sheet is installed in the gap and fits with one side of the pressing layer, and then the sandwich layer and the partition are installed to form a "current collecting sheet-sandwich layer-partition layer-partition layer-sandwich layer-current collecting sheet" type installation structure distribution in the gap. During the test, a block-shaped gel electrode is placed between the sandwich layer and the partition layer, and a gel electrolyte is placed between the partition layer and the partition layer. Through holes for the bottom end of the tightening piece to pass through are opened on the sandwich layer and the partition layer. The tightening piece is rotated forward through the thread, and the bottom end presses the current collecting sheet so that the current collecting sheet contacts the gel electrode through the through hole, forming a stacked battery structure.

[0015] Limiting walls are arranged at both ends of the lamination layer, and both of the limiting walls face one side of the gap, and a limiting groove is formed between two limiting walls on the same lamination layer.

[0016] By adopting the above technical solution, the limiting groove formed by the upper limiting wall on the lamination layer mainly serves to limit the installation position of the sandwich layer and the partition layer, so that the sandwich layer and the partition layer are not easy to slide and dislocate in the gap.

[0017] The dimensions of the sandwich panels and dividers are perfectly matched to the retaining grooves.

[0018] By adopting the above technical solution, the installation positions of the sandwich layer and the partition layer are restricted so that the through holes opened on the sandwich layer and the partition layer can overlap without misalignment.

[0019] A collecting groove is provided on one side of the sandwich layer close to the pressing layer, one end of the collecting groove is connected to the through hole, and the end of the collecting groove close to the through hole is provided with an arc-shaped groove. The current collecting sheet includes a pressing sheet end and a drainage end. The size of the pressing sheet end is just matched with the through hole, the width and thickness of the drainage end are just matched with the collecting groove, and the length of the drainage end is greater than the length of the collecting groove.

[0020] By adopting the above technical solution, the current collecting sheet includes two parts: a pressing sheet end and a drainage end. The size of the pressing sheet end just matches the through hole, and the drainage end and the collecting groove just match each other. The length of the drainage end is longer than the length of the collecting groove, so that the drainage end has an extra part compared to the whole, which is used to connect with the external wire. By twisting the tightening piece, the bottom end of the tightening piece will press against the pressing sheet end. As the tightening piece rotates forward, the pressing sheet end will bend, and the arc groove of the collecting groove near one end of the through hole provides a certain deformation space for the bending of the pressing sheet.

[0021] The connecting plate, the pressing layer, the screw-on parts, the sandwich layer and the partition are all made of insulating materials.

[0022] By adopting the above technical solution, the connecting plate, the pressing layer, the screwing piece, the sandwich layer and the partition are all made of insulating materials, so that they only play a supporting role in the assembly of the gel battery and will not interfere with and affect the test of the gel battery.

[0023] The cross-sectional diameter of the bottom end of the tightening member is greater than 10 mm.

[0024] By adopting the above technical solution, the bottom end of the tightening member abuts against the pressing end and then contacts the gel electrode block. The cross-sectional size of the bottom end of the tightening member determines the area size of the gel electrode involved in battery assembly.

[0025] In summary, the present application includes at least one of the following beneficial effects:

[0026] The full gel battery fixture can completely clamp the soft block-shaped gel electrode without affecting or destroying the structure of the gel. By rotating the tightening parts, the gel is slightly squeezed so that the gel electrode and the electrolyte are in contact with each other to assemble into a complete full gel battery. Through the current guiding effect of the collector, the wires of the external test equipment are connected to the collector, so that the gel battery can be tested normally by the external equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the combined structure of the fixture for the full gel battery assembly test of the first embodiment of the present invention;

[0028] Figure 2 is a structural exploded diagram of a fixture for the full gel battery assembly test of the first embodiment;

[0029] Figure 3 is an exploded front view of the structure of the fixture for the full gel battery assembly test of the first embodiment of the present invention;

[0030] Figure 4 is a left sectional view of a fixture for the full gel battery assembly test of the first embodiment;

[0031] Figure 5 is a schematic structural diagram of the sandwich layer of the first embodiment;

[0032] Figure 6 is a schematic structural diagram of the current collecting sheet of the first embodiment;

[0033] Figure 7 It is a structural exploded diagram of the fixture for the full gel battery assembly test of the second embodiment.

[0034] Explanation of the reference numerals in the accompanying drawings: 1. Fastening part; 11. Screw; 2. Pressing layer; 21. Limiting wall; 211. Limiting groove; 22. Pin; 23. Threaded hole; 24. Gap; 3. Connecting plate; 31. Plug hole; 4. Current collecting sheet; 41. Pressing sheet end; 42. Drainage end; 5. Clip layer; 51. Through hole; 52. Current collecting groove; 521. Arc groove; 6. Partition. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-7 This application is described in further detail.

[0036] The embodiment of the present application discloses a fixture for full gel battery assembly testing.

[0037] Example 1: Reference Figure 1 A fixture for the assembly test of a full gel battery includes a connecting plate 3, two pressing layers 2, two screwing parts 1, two current collecting sheets 4, two sandwich layers 5 and two interlayers 6. The connecting plate 3, the pressing layer 2, the screwing part 1, the sandwich layer 5 and the interlayer 6 are all made of insulating materials. The insulating material can be selected from polytetrafluoroethylene, polyethylene, polypropylene, polymethyl methacrylate, etc. In this embodiment, it is specifically made of polypropylene material, so that it only plays a supporting role in the assembly of the gel battery and will not interfere with and affect the test of the gel battery. The current collecting sheet 4 needs to have good conductivity to conduct the current generated by the battery, so this embodiment uses a 2mm metal copper foil as the current collecting sheet 4.

[0038] Reference Figure 2 , Figure 3 and Figure 4, a plug hole 31 is provided on the connecting plate 3, a plug pin 22 is provided at one end of the lamination layer 2, the lamination layer 2 and the connecting plate 3 are connected by a pin, and the plug pin 22 of the lamination layer 2 is columnar, and the plug pin 22 is inserted into the plug hole 31 of the connecting plate 3 to be fixed. A threaded hole 23 is provided on the lamination layer 2, and the screw-on member 1 is connected to the lamination layer 2 by a thread. In this embodiment, the screw-on member 1 is specifically a screw 11, and the specification of the screw 11 is M20. Through holes 51 of the same specification are provided on the sandwich layer 5 and the partition layer 6, and the through holes 51 can be used for the bottom end of the screw 11 to pass. A gap 24 is formed between the two lamination layers 2, and the two current collecting sheets 4 are respectively installed in the gap 24 close to the side of the lamination layer 2, the two sandwich layers 5 are respectively installed in the gap 24 close to the side of the current collecting sheet 4, and the two partition layers 6 are respectively installed in the gap 24 close to the side of the sandwich layer 5. A "current collecting sheet 4 - sandwich layer 5 - spacer 6 - spacer 6 - sandwich layer 5 - current collecting sheet 4" type installation structure distribution is formed in the gap 24. During the test, a sheet of gel is sandwiched between the sandwich layer 5 and the spacer 6 to serve as an electrode, and a sheet of gel is sandwiched between the spacer 6 and the spacer 6 to serve as an electrolyte. Since the gel itself is soft, the pieces of gel can be better overlapped under the support of external force, so the spacer 6 and the sandwich layer 5 play a supporting role for the piece-shaped gel electrode.

[0039] The sandwich layer 5 and the spacer 6 are both provided with through holes 51 through which the bottom end of the screw 11 can pass. The screw 11 is rotated forward through the thread, and the bottom end of the screw 11 presses against the current collecting sheet 4 so that the current collecting sheet 4 contacts the gel electrode through the through hole 51, forming a stacked battery structure. The bottom end of the screw 11 contacts the current collecting sheet 4, and then contacts the sheet-like gel electrode. The cross-sectional size of the bottom end of the screw 11 determines the area size of the gel electrode involved in the battery assembly.

[0040] Furthermore, limiting walls 21 are provided at both ends of the laminated layer 2, and the limiting walls 21 are both oriented toward the gap 24. A limiting groove 211 is formed between the two limiting walls 21 on the same laminated layer 2, and the sizes of the sandwich layer 5 and the partition layer 6 are just matched with the limiting groove 211.

[0041] Specifically, the limiting groove 211 formed by the upper limiting wall 21 on the laminated layer 2 mainly serves to limit the installation position of the sandwich layer 5 and the spacer 6, and the size of the sandwich layer 5 and the spacer 6 is exactly matched with the limiting groove 211, so that the sandwich layer 5 and the spacer 6 are not easy to slide and dislocate in the gap 24 and limit the installation position of the sandwich layer 5 and the spacer 6, so that the through holes 51 opened on the sandwich layer 5 and the spacer 6 can overlap without dislocation.

[0042] Further, refer to Figure 5 and Figure 6A collecting groove 52 is provided on one side of the sandwich layer 5 close to the laminated layer 2, one end of the collecting groove 52 is connected to the through hole 51, and the end of the collecting groove 52 close to the through hole 51 is provided with an arc groove 521. The collecting sheet 4 includes a pressing sheet end 41 and a drainage end 42. The size of the pressing sheet end 41 is just matched with the through hole 51, the width and thickness of the drainage end 42 are just matched with the collecting groove 52, and the length of the drainage end 42 is greater than the length of the collecting groove 52.

[0043] Specifically, the current collecting sheet 4 includes two parts: a pressing sheet end 41 and a drain end 42. The size of the pressing sheet end 41 is exactly matched with the through hole 51, and the drain end 42 is exactly matched with the collecting groove 52. The length of the drain end 42 is longer than the length of the collecting groove 52, so that the drain end 42 has an extra part compared to the whole, which is used to connect with the external wire. By twisting the screw 11, the bottom end of the screw 11 will abut against the pressing sheet end 41. As the screw 11 rotates forward, the pressing sheet end 41 will bend, and the arc groove 521 of the collecting groove 52 near the through hole 51 provides a certain deformation space for the bending of the pressing sheet.

[0044] Through the assembled fixture, the flexible gel electrode and the gel electrolyte can be overlapped and assembled to form a gel battery, and the wire of the external test instrument can be connected to the current collector 4 with excellent conductivity, thereby realizing relevant battery tests. The connection between the external wire and the current collector 4 avoids the external wire being connected to the gel electrode and causing the gel structure to be destroyed, protects the integrity of the gel battery structure, and realizes stable testing and output of the gel battery.

[0045] In addition, the gel electrode itself has a certain degree of stickiness, which makes it easy to adhere to the fixture and difficult to clean. This embodiment is a fixture for assembling and testing a full gel battery, which is divided into a connecting plate 3, two pressing layers 2, two tightening parts 1, two current collectors 4, two sandwich layers 5 and two partitions 6. Its main advantage is that it is easy to clean.

[0046] Example 2: Reference Figure 7 A fixture for the assembly test of a full gel battery includes a connecting plate 3, two pressing layers 2, two screwing parts 1, two current collecting sheets 4, two sandwich layers 5 and two interlayers 6. The connecting plate 3, the pressing layer 2, the screwing part 1, the sandwich layer 5 and the interlayer 6 are all made of insulating materials. In this embodiment, it is specifically made of polytetrafluoroethylene material, so that it only supports the assembly of the gel battery and will not interfere with and affect the test of the gel battery. The current collecting sheet 4 needs to have good conductivity to conduct the current generated by the battery. This embodiment 2 uses a 2mm metal aluminum foil as the current collecting sheet 4.

[0047] The difference between this embodiment and the first embodiment is that the pin 22 is simplified in this embodiment, and one end of the pressed layer 2 is directly inserted into the insertion hole 31 on the connecting plate 3 for fixing, thereby simplifying the processing process of the clamp. The remaining specific implementation details are consistent with the first embodiment.

[0048] The implementation principle of the fixture for full gel battery assembly test in the first and second embodiments of the present application is as follows:

[0049] The full gel battery assembly test fixture made of insulating material is used to overlap and assemble the flexible gel electrode and gel electrolyte to form a gel battery, and the fixture provides support for the gel. The gel electrode is connected to the battery test instrument through the current collector 4 with excellent conductivity to realize the relevant test of the battery, which can make the assembly of the full gel battery more convenient and standardize the test of the full gel battery.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fixture for assembly and testing of a full gel battery, comprising a connecting plate (3), two pressing layers (2), two tightening members (1), two current collecting sheets (4), two sandwich layers (5) and two spacers (6), characterized in that: The connecting plate (3) is provided with an insertion hole (31), one end of the pressing layer (2) is provided with a plug pin (22), the pressing layer (2) and the connecting plate (3) are connected by a pin, the pressing layer (2) is provided with a threaded hole (23), the screw-on component (1) is connected to the pressing layer (2) by a thread, the sandwich layer (5) and the partition layer (6) are both provided with through holes (51) of the same specification, the through holes (51) can allow the bottom end of the screw-on component (1) to pass through, a gap (24) is formed between the two pressing layers (2), the two current collecting sheets (4) are respectively installed in the gap (24) on one side close to the pressing layer (2), the two sandwich layers (5) are respectively installed in the gap (24) on one side close to the current collecting sheet (4), and the two partition layers (6) are respectively installed in the gap (24) on one side close to the sandwich layer (5).

2. A fixture for assembly and testing of full gel batteries according to claim 1, characterized in that: Limiting walls (21) are provided at both ends of the lamination layer (2), and the limiting walls (21) are both oriented toward one side of the gap (24), and a limiting groove (211) is formed between two limiting walls (21) on the same lamination layer (2).

3. A fixture for assembly and testing of full gel batteries according to claim 2, characterized in that: The sizes of the sandwich layer (5) and the spacer layer (6) are just matched with the limiting groove (211).

4. A fixture for assembly and testing of full gel batteries according to claim 3, characterized in that: A collecting groove (52) is provided on one side of the sandwich layer (5) close to the lamination layer (2), one end of the collecting groove (52) is connected to the through hole (51), and one end of the collecting groove (52) close to the through hole (51) is provided as an arc-shaped groove (521), and the collecting sheet (4) includes a pressing sheet end (41) and a drainage end (42), the size of the pressing sheet end (41) is exactly matched with the through hole (51), the width and thickness of the drainage end (42) are exactly matched with the collecting groove (52), and the length of the drainage end (42) is greater than the length of the collecting groove.

5. A fixture for assembly and testing of full gel batteries according to claim 4, characterized in that: The connecting plate (3), the pressing layer (2), the screwing member (1), the sandwich layer (5) and the spacer (6) are all made of insulating materials, and the current collecting sheet (4) is made of high-conductivity material.

6. A fixture for assembly and testing of full gel batteries according to claim 5, characterized in that: The cross-sectional diameter of the bottom end of the screwing member (1) is greater than 10 mm.

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