Multifunctional clamp

Abstract

The utility model belongs to the technical field of batteries, and discloses a multifunctional clamp which is used for clamping a pole piece and a diaphragm, the pole piece and the diaphragm are stacked, the pole piece is connected with a pole lug, and the multifunctional clamp comprises a lower base, an upper cover plate, a limiting piece, a middle cover plate, a first pressurizing assembly and a second pressurizing assembly, a mounting cavity for accommodating a pole piece and a diaphragm is formed in one side surface of the lower base; the upper cover plate is arranged on the side, provided with the mounting cavity, of the lower base. The limiting piece is arranged in the mounting cavity; the middle cover plate is arranged between the lower base and the upper cover plate, and the two ends of the middle cover plate are detachably connected with the lower base and the upper cover plate respectively; the first pressurizing assembly and the second pressurizing assembly are detachably connected to the middle cover plate. Therefore, the diaphragm and the pole piece are assembled in the mounting cavity, under the action of the first pressurizing assembly and the second pressurizing assembly, the middle cover plate can limit the pole piece, and the limiting piece can limit the pole lug, so that the assembly of the symmetrical battery is more standard and stable, and the manufacturing precision of the symmetrical battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a multifunctional clamp. Background Art

[0002] Lithium-ion batteries have been widely used in the field of energy storage. With the development of science and technology, in order to meet the growing demands in performance, cost and scalability, further exploration of lithium-ion batteries is needed to enable them to have better performance.

[0003] In order to verify the potential of the electrode in the actual battery and provide feedback for further improvement, the electrochemical performance of the electrode needs to be tested. A symmetric battery is a basic battery structure with two identical working electrodes. After disassembling the full battery after cycling, the positive electrode, negative electrode and separator are reassembled into a symmetric battery. The tabs of the symmetric battery are energized and the interface impedance changes of the symmetric battery are tested. By comparing the impedance data of the symmetric battery and the full battery after cycling, the impedance changes caused by the differences in the electrode materials can be separated to make corresponding improvements and improve the performance of the full battery.

[0004] In the process of making symmetrical batteries, the positive electrode sheet to be tested, the diaphragm, and the negative electrode sheet to be tested need to be assembled in sequence. Due to the lack of relevant standard methods for the production of symmetrical batteries, it is difficult to position the stacked electrodes and diaphragms and keep their relative positions unchanged during the assembly process. If the electrode sheet and the diaphragm cannot be completely overlapped due to inaccurate positioning, the value of the interface impedance may be affected. If the diaphragm and the electrode sheet are fixedly connected by gluing, the introduction of the glue film increases the thickness of the diaphragm, which may also affect the value of the interface impedance, resulting in low accuracy of the impedance test results, low manufacturing precision of symmetrical batteries, and unstable interface impedance. Utility Model Content

[0005] The utility model aims to provide a multifunctional clamp, which can improve the manufacturing precision and testing accuracy of symmetrical batteries.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A multifunctional clamp for clamping a pole piece and a diaphragm, wherein the pole piece and the diaphragm are stacked, and the pole piece is connected to a pole ear, and the multifunctional clamp comprises: a lower base, a side surface of the lower base is provided with a mounting cavity for accommodating the pole piece and the diaphragm; an upper cover plate, the upper cover plate is arranged on the side of the lower base where the mounting cavity is opened; a limit member, the limit member is arranged in the mounting cavity, and the limit member is used to accommodate the pole ear; a middle cover plate, the middle cover plate is arranged between the lower base and the upper cover plate, and the two ends of the middle cover plate are detachably connected to the lower base and the upper cover plate respectively; a first pressurizing component, the first pressurizing component is detachably connected to the middle cover plate, and is used to apply pressure to the pole piece and the diaphragm; a second pressurizing component, the second pressurizing component is detachably connected to the middle cover plate, and is used to apply pressure to the pole ear.

[0008] Preferably, the first pressurizing assembly includes a pressurizing plate and a first elastic member, the pressurizing plate is detachably connected to the middle cover plate, and the pressurizing plate moves relative to the middle cover plate; the two ends of the first elastic member are respectively abutted against the pressurizing plate and the upper cover plate, for providing pressure to the pressurizing plate so that the pressurizing plate is tightly abutted against the diaphragm.

[0009] Preferably, the middle cover plate is provided with a limiting hole, the cross-sectional area of ​​the limiting hole is not less than the cross-sectional area of ​​the diaphragm, and the pressure plate is slidably connected in the limiting hole.

[0010] Preferably, the second pressurizing assembly includes a pressure block and a second elastic member, wherein the pressure block is detachably connected to the middle cover plate and moves relative to the middle cover plate; two ends of the second elastic member are respectively abutted against the pressure block and the middle cover plate, for providing pressure to the pressure block so that the pressure block is tightly abutted against the tab.

[0011] Preferably, the second pressurizing assembly further comprises a mounting plate, the mounting plate is detachably connected to the middle cover plate, the pressure block is detachably connected to the mounting plate, the mounting plate is provided with a pressurizing hole, and the pressure block is slidably connected in the pressurizing hole.

[0012] Preferably, the first pressurizing assembly includes a pressurizing plate that can selectively abut against the diaphragm, the pressurizing plate is slidably connected to the middle cover plate, the pressurizing plate is connected with a first limiting protrusion, the first limiting protrusion can selectively abut against the middle cover plate to limit the moving distance of the pressurizing plate; and / or, the second pressurizing assembly includes a pressure block and a mounting plate, the pressure block can selectively abut against the pole ear, the pressure block is slidably connected to the mounting plate, the pressure block is connected with a second limiting protrusion, the second limiting protrusion can selectively abut against the mounting plate to limit the moving distance of the pressure block.

[0013] Preferably, the multifunctional clamp further includes a first seal, which is arranged between the middle cover plate and the lower base; and / or the multifunctional clamp further includes a second seal, which is arranged between the middle cover plate and the upper cover plate.

[0014] Preferably, the limiting member is provided with a limiting groove for limiting the position of the tab on the limiting member.

[0015] Preferably, the lower base is connected to a connecting wire, the limiting member is connected to a metal connecting plate, the metal connecting plate is located in the limiting groove and is electrically connected to the connecting wire, and is used to electrically connect the pole ear to the connecting wire through the metal connecting plate.

[0016] Preferably, a connecting column is provided on the side of the lower base facing the middle cover plate, and a connecting hole for inserting the connecting column is opened at a position of the middle cover plate corresponding to the connecting column, so as to limit the relative position of the middle cover plate and the lower base; and / or, the first pressurizing assembly includes a pressurizing plate slidably connected to the middle cover plate, a guide column is connected to the side of the pressurizing plate facing the upper cover plate, and a guide hole for inserting the guide column is opened on the upper cover plate corresponding to the guide column, so as to limit the relative position of the pressurizing plate and the upper cover plate.

[0017] Beneficial effects of the utility model:

[0018] A multifunctional clamp for clamping a pole piece and a diaphragm, wherein the pole piece and the diaphragm are stacked, and the pole piece is connected to a pole ear. The multifunctional clamp comprises a lower base, an upper cover, a limiter, a middle cover, a first pressurizing assembly and a second pressurizing assembly, wherein a mounting cavity for accommodating the pole piece and the diaphragm is provided on one side of the lower base; the upper cover is arranged on the side of the lower base where the mounting cavity is provided; the limiter is arranged in the mounting cavity, and the limiter is used to accommodate the pole ear; the middle cover is arranged between the lower base and the upper cover, and the two ends of the middle cover are detachably connected to the lower base and the upper cover respectively; the first pressurizing assembly is detachably connected to the middle cover for applying pressure to the pole piece and the diaphragm; the second pressurizing assembly is detachably connected to the middle cover for applying pressure to the pole ear.

[0019] In this way, the diaphragm and the pole piece are stacked in sequence in the installation cavity, and the pole ear is connected to the limit piece, the middle cover plate is connected to the diaphragm, and the diaphragm and the pole piece are tightly connected, so that the first pressurizing component applies pressure to the pole piece and the diaphragm, and the second pressurizing component applies pressure to the pole ear, which can limit the position of the pole ear, diaphragm, and pole piece, and avoid the position of the pole ear, diaphragm, and pole piece from shifting during the assembly of symmetrical batteries, improve the manufacturing accuracy of symmetrical batteries, make the interface impedance of symmetrical batteries more stable, reduce the interference of other factors on the interface impedance of symmetrical batteries, facilitate subsequent use and testing, and improve the accuracy of battery performance test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the multifunctional clamp in the assembly state in one embodiment of the utility model;

[0021] Figure 2 It is a side exploded view of a multifunctional clamp in one embodiment of the utility model;

[0022] Figure 3 This is an exploded view of a multifunctional clamp in one embodiment of the utility model;

[0023] Figure 4 In one embodiment of the utility model Figure 3 A magnified image of point A;

[0024] Figure 5 This is a front exploded view of a multifunctional clamp in one embodiment of the utility model;

[0025] Figure 6 It is an exploded view of a three-electrode battery in one embodiment of the utility model.

[0026] In the figure:

[0027] 1. Pole piece; 11. Pole ear; 2. Diaphragm; 3. Lower base; 31. Mounting cavity; 32. Connecting wire; 33. Connecting column; 4. Upper cover; 41. Guide hole; 5. Limiting member; 51. Limiting groove; 52. Metal connecting piece; 6. Middle cover; 61. Limiting hole; 62. Connecting hole; 7. First pressurizing component; 71. Pressurizing plate; 711. Accommodating groove; 712. First limiting protrusion; 713. Guide column; 72. First elastic member; 8. Second pressurizing component; 81. Pressing block; 811. Second limiting protrusion; 82. Second elastic member; 83. Mounting plate; 831. Pressurizing hole; 91. First sealing member; 92. Second sealing member. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] See also Figure 1-Figure 3The utility model provides a multifunctional clamp for clamping a pole piece 1 and a diaphragm 2. The pole piece 1 and the diaphragm 2 are stacked, and the pole piece 1 is connected with a pole ear 11. The multifunctional clamp comprises a lower base 3, an upper cover plate 4, a stopper 5, a middle cover plate 6, a first pressurizing assembly 7 and a second pressurizing assembly 8. A mounting cavity 31 for accommodating the pole piece 1 and the diaphragm 2 is provided on one side of the lower base 3; the upper cover plate 4 is provided on one side of the lower base 3 where the mounting cavity 31 is provided; the stopper 5 is provided in the mounting cavity 31 for accommodating the pole ear 11; the middle cover plate 6 is provided between the lower base 3 and the upper cover plate 4, and the two ends of the middle cover plate 6 are detachably connected to the lower base 3 and the upper cover plate 4 respectively; the first pressurizing assembly 7 is detachably connected to the middle cover plate 6 for applying pressure to the pole piece 1 and the diaphragm 2; the second pressurizing assembly 8 is detachably connected to the middle cover plate 6 for applying pressure to the pole ear 11. The number of pole pieces 1 and diaphragms 2 is at least two.

[0033] Among them, the installation cavity 31 is opened on the top surface of the lower base 3, and the shape of the installation cavity 31 is adapted to the shape of the diaphragm 2 and the pole piece 1, so that the diaphragm 2 and the pole piece 1 can be placed in the installation cavity 31, and the cross-sectional area of ​​the upper cover plate 4 is larger than the cross-sectional area of ​​the diaphragm 2, so that when the upper cover plate 4 is connected to the lower base 3, the diaphragm 2 and the pole piece 1 are covered by the lower base 3 and the upper cover plate 4; the middle cover plate 6 is a plate-like structure with the same cross-sectional area as the lower base 3, and the upper cover plate 4 and the middle cover plate 6 are detachably connected by bolts, and the limiter 5 is a rectangular plate-like structure, the limiter 5 is located on the side of the lower base 3 facing the upper cover plate 4, and is arranged at one end in the length direction of the installation cavity 31, when the pole piece 1 is placed in the installation cavity 31, the pole ear 11 abuts against the side of the limiter 5 away from the lower base 3; the limiter 5 is made of insulating material, and further, the limiter 5 is made of ceramic material.

[0034] It should be noted that when assembling a symmetrical battery, the structure of the laminated cell is used to place the pole piece 1 and the diaphragm 2 in the installation cavity 31 in order. Specifically, first, a cut layer of diaphragm 2 is laid flat on the bottom surface of the installation cavity 31, and then the pole piece 1 is placed on the diaphragm 2, and the pole ear 11 of the pole piece 1 is connected to the limiter 5, and then a layer of diaphragm 2 is laid. After that, the pole piece 1 of the opposite polarity is placed on the diaphragm 2, and the pole ear 11 of the pole piece 1 of the opposite polarity is connected to the limiter 5, and then a layer of diaphragm 2 is laid to realize the assembly of the pole piece 1 of the symmetrical battery, and the position of the diaphragm 2 and the pole piece 1 is adjusted. Place the pole piece 1 and the diaphragm 2 in the same concentricity (that is, the diagonal intersection of the pole piece 1 and the diagonal intersection of the diaphragm 2 are on the same straight line, and the straight line is perpendicular to the bottom surface of the installation cavity 31), inject electrolyte into the installation cavity 31, install the first pressurizing assembly 7 and the second pressurizing assembly 8 on the middle cover plate 6 respectively, so that the first pressurizing assembly 7 applies pressure to the pole piece 1 and the diaphragm 2, and the second pressurizing assembly 8 applies pressure to the pole lug 11, and assemble the middle cover plate 6 and the upper cover plate 4 in sequence, so that the installation cavity 31 forms a closed space, and the production of the symmetrical battery is completed. The impedance test is performed by electrically connecting the power supply device to the pole lug 11, and the full battery after the cycle is analyzed using a symmetrical battery to identify the interface impedance changes of the positive and negative electrodes.

[0035] In this way, the diaphragm 2 and the electrode 1 are assembled into the installation cavity 31 in sequence, and the installation cavity 31 and the middle cover plate 6 can limit the electrode 1, so that the electrode 1 and the diaphragm 2 are not easily offset when the upper cover plate 4 is connected to the lower base 3, reducing the impact of the offset of the electrode 1 and the diaphragm 2 during the assembly process on the interface impedance of the symmetrical battery; the limiter 5 can limit the position of the pole ear 11, avoid the pole ear 11 from offsetting during the assembly process, and affect the normal use of the symmetrical battery. The first pressurizing component 7 can limit the pole piece 1 and the diaphragm 2 by applying pressure to the pole piece 1 and the diaphragm 2, and the second pressurizing component 8 can limit the pole ear 11 by applying pressure to the pole ear 11, thereby achieving the limitation of the pole ear 11, the pole piece 1, and the diaphragm 2, which can make the assembly of the symmetrical battery more standard and stable, facilitate subsequent use and testing, reduce interference items in the test, improve the test accuracy, and improve the manufacturing accuracy of the symmetrical battery and the interface impedance stability of the symmetrical battery.

[0036] See also Figure 3 and Figure 4 In some embodiments, the lower base 3 is connected to a connecting wire 32 , and the limiting member 5 is connected to a metal connecting piece 52 . The metal connecting piece 52 is located in the limiting groove 51 and is electrically connected to the connecting wire 32 , so as to electrically connect the pole ear 11 to the connecting wire 32 .

[0037] It should be noted that the connecting wire 32 passes through the lower base 3 and is connected to the metal connecting sheet 52. When the pole ear 11 is connected to the limiter 5, the pole ear 11 abuts against the metal connecting sheet 52; when the pole ear 11 is connected to the power-on device through the connecting wire 32, the power-on device can energize the pole piece 1 and the diaphragm 2 through the pole ear 11, which is convenient for testing the interface impedance of the symmetrical battery; when the pole ear 11 is connected to the external circuit through the connecting wire 32, the symmetrical battery can be used as a power supply device to provide a stable current to the external circuit.

[0038] In this way, the multifunctional fixture can be used to manufacture symmetrical batteries so that the symmetrical batteries can be connected to external circuits as power supply devices, and can also be used to test the interface impedance of the manufactured symmetrical batteries, so that the multifunctional fixture can be adapted to a variety of application scenarios.

[0039] See also Figure 5 In some embodiments, the first pressurizing assembly 7 includes a pressurizing plate 71 and a first elastic member 72. The pressurizing plate 71 and the middle cover plate 6 are detachably connected. The pressurizing plate 71 moves relative to the middle cover plate 6. The two ends of the first elastic member 72 are respectively abutted against the pressurizing plate 71 and the upper cover plate 4, so as to provide pressure to the pressurizing plate 71 so that the pressurizing plate 71 is tightly abutted against the diaphragm 2.

[0040] In this embodiment, the pressure plate 71 is arranged on the side of the upper cover plate 4 facing the middle cover plate 6, the cross-sectional area of ​​the pressure plate 71 is adapted to the cross-sectional area of ​​the diaphragm 2, the first elastic member 72 is a spring, four first elastic members 72 are arranged, and the four first elastic members 72 are respectively arranged on the side of the pressure plate 71 facing the upper cover plate 4, and the pressure plate 71 is provided with a vertical receiving groove 711 corresponding to the first elastic member 72, and the length of the receiving groove 711 is less than the length of the first elastic member 72, so that one end of the first elastic member 72 is located in the receiving groove 711, and the other end is abutted against the side of the upper cover plate 4 facing the pressure plate 71. The pressure plate 71 is made of insulating material, and further, the pressure plate 71 is made of ceramic material.

[0041] It should be understood that when the symmetrical battery is assembled, the pressure plate 71 is brought into contact with the topmost diaphragm 2, and the first elastic member 72 is assembled so that the upper cover plate 4 is connected to the pressure plate 71 through the first elastic member 72. The first elastic member 72 is compressed and applies a vertical elastic force to the pressure plate 71, so that the pressure plate 71 applies pressure to the diaphragm 2 and the pole piece 1 and is pressed by the pressure plate 71, thereby limiting the position of the diaphragm 2 and the pole piece 1 and avoiding displacement during the assembly process, which affects the assembly effect.

[0042] In this way, the pressure plate 71 clamps the diaphragm 2 and the pole piece 1 under the action of the first elastic member 72, so that the symmetrical battery can be subjected to a fixed pressure after assembly, thereby avoiding the interface impedance of the symmetrical battery being affected by the unstable pressure between the pole piece 1 and the diaphragm 2. By replacing the first elastic member 72 with different elastic forces, the pressure on the symmetrical battery can be adjusted, which is convenient for testing the performance of the symmetrical battery under different pressures.

[0043] It is understandable that the upper cover plate 4 may also be provided with a groove (not shown in the figure) for the first elastic member 72 to extend into, so as to further limit the position of the first elastic member 72. The connection method between the first elastic member 72 and the upper cover plate 4 and the pressure plate 71 can be flexibly adjusted so as to realize continuous and stable application of vertical elastic force to the pressure plate 71. No further examples are given here.

[0044] See also Figure 6 In some embodiments, the middle cover plate 6 is provided with a limiting hole 61, the cross-sectional area of ​​the limiting hole 61 is not less than the cross-sectional area of ​​the diaphragm 2, the pressure plate 71 is slidably connected in the limiting hole 61, and the first elastic member 72 is arranged on the side of the pressure plate 71 facing the upper cover plate 4.

[0045] In this way, after the symmetrical battery is assembled into the installation cavity 31, the limiting hole 61 can further limit the side wall of the symmetrical battery to avoid horizontal displacement of the diaphragm 2 and the pole piece 1 during the assembly of the multi-functional clamp. The pressure plate 71 passes through the limiting hole 61 and is slidably connected to the middle cover plate 6, which can limit the diaphragm 2 located at the top and apply pressure toward the lower base 3, so as to further limit and stably clamp the diaphragm 2 and the pole piece 1, thereby improving the manufacturing accuracy of the symmetrical battery.

[0046] It can be understood that the pressure plate 71 can also be arranged on the side of the middle cover plate 6 facing the pole piece 1 and the diaphragm 2. In this embodiment, the pressure plate 71 passes through the limiting hole 61 and is slidably connected to the middle cover plate 6, which can reduce the volume of the multifunctional clamp while maintaining the limiting and applying pressure to the pole piece 1 and the diaphragm 2, making the various structures of the multifunctional clamp more compact and easy to assemble.

[0047] See also Figure 5 In some embodiments, the second pressurizing assembly 8 includes a pressure block 81 and a second elastic member 82. The pressure block 81 is detachably connected to the middle cover plate 6, and the pressure block 81 moves relative to the middle cover plate 6. The two ends of the second elastic member 82 are respectively abutted against the pressure block 81 and the middle cover plate 6, so as to provide pressure to the pressure block 81 so that the pressure block 81 is tightly abutted against the pole ear 11.

[0048] In this embodiment, a plurality of pressing blocks 81 are provided, and the number of pressing blocks 81 is the same as the number of pole ears 11, and each pressing block 81 corresponds to abutting against a pole ear 11. The second elastic member 82 is a spring, and each pressing block 81 corresponds to a second elastic member 82 connected thereto, and one end of the second elastic member 82 abuts against the middle cover plate 6, and the other end abuts against the pressing block 81; the pressing block 81 is made of insulating material, and further, the pressing block 81 is made of ceramic material.

[0049] It should be noted that when the pole lug 11 is placed on the limiting member 5, the pressing block 81 is connected to the pole lug 11 one by one, and the second elastic member 82 and the middle cover plate 6 are assembled, so that the second elastic member 82 can be compressed and apply an elastic force toward the lower base 3 to the pressing block 81, so that the pressing block 81 and the limiting member 5 jointly press the pole lug 11 to achieve the limitation of the pole lug 11.

[0050] In this way, the pressing block 81 is in tight contact with the pole ear 11 under the action of the second elastic member 82 and applies pressure to the pole ear 11 toward the lower base 3, so that the pressing block 81 and the limiting member 5 can limit and clamp the pole ear 11, thereby preventing the pole ear 11 from shifting and affecting the normal operation of the symmetrical battery, improving the manufacturing accuracy of the symmetrical battery, and making the interface impedance more stable.

[0051] It is understandable that the first elastic member 72 and the second elastic member 82 may also be other elastic structures such as elastic blocks made of elastic material, and are not limited to springs. The number and structure of the first elastic member 72 and the second elastic member 82 may be flexibly adjusted.

[0052] See also Figure 3 and Figure 4 In some embodiments, the limiting member 5 is provided with a limiting groove 51 for limiting the position of the tab 11 on the limiting member 5 .

[0053] In this embodiment, the limiting member 5 is provided with three limiting grooves 51, the shape of the limiting grooves 51 is adapted to the shape of the pole ear 11, the three limiting grooves 51 are arranged at equal intervals along the length direction of the limiting member 5, the pressing block 81 is arranged one by one corresponding to the limiting grooves 51, and a metal connecting plate 52 is arranged in each limiting groove 51.

[0054] Thus, the multifunctional fixture can be used to make or test both symmetrical batteries and three-electrode batteries (see Figure 6), and the number of the pressing blocks 81 can be flexibly adjusted according to the type of battery to be manufactured or tested, so that the use scenario of the multifunctional fixture is more flexible and can be adapted to more types of batteries. When the multifunctional fixture is used to manufacture or test a symmetrical battery, the electrode sheet 1 includes a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet and the negative electrode sheet are respectively connected with a positive electrode ear and a negative electrode ear, and the positive electrode ear and the negative electrode ear are respectively connected with a positive electrode metal connecting sheet and a negative electrode metal connecting sheet, and the positive electrode metal connecting sheet and the negative electrode metal connecting sheet are respectively connected with a positive electrode connecting wire and a negative electrode connecting wire. When the multifunctional fixture is used to make or test a three-electrode battery, the electrode 1 includes a positive electrode, a negative electrode and a reference electrode, and the positive electrode, the negative electrode and the reference electrode are respectively connected with a positive electrode ear, a negative electrode ear and a reference electrode ear, and the positive electrode ear, the negative electrode ear and the reference electrode ear are respectively connected with a positive metal connecting piece, a negative metal connecting piece and a reference metal connecting piece, and the positive metal connecting piece, the negative metal connecting piece and the reference metal connecting piece are respectively connected with a positive connecting wire, a negative connecting wire and a reference connecting wire.

[0055] See also Figure 5 In some embodiments, the second pressurizing assembly 8 further includes a mounting plate 83, which is detachably connected to the middle cover plate 6, and the pressure block 81 is detachably connected to the mounting plate 83. The mounting plate 83 is provided with a pressurizing hole 831, and the pressure block 81 is slidably connected in the pressurizing hole 831.

[0056] Among them, the mounting plate 83 is arranged on the side of the pressure block 81 facing the lower base 3, the length direction of the mounting plate 83 is parallel to the length direction of the limit member 5, and a plurality of pressurizing holes 831 are opened on the mounting plate 83 corresponding to the pressure block 81. The mounting plate 83 is detachably connected to the side of the middle cover plate 6 facing the lower base 3 by bolts.

[0057] In this way, the pressing block 81 passes through the pressure hole 831 and is slidably connected to the mounting plate 83, which can limit the moving direction of the pressing block 81 and prevent the pressing block 81 from being offset during the sliding process, thereby affecting the clamping effect of the pressing block 81 on the pole lug 11 or even causing damage to the pole lug 11, making the clamping of the pressing block 81 on the pole lug 11 more stable.

[0058] It is understandable that the pressure hole 831 can also be a long hole that can accommodate multiple pressure blocks 81. In this embodiment, the pressure hole 831 corresponds to the pressure block 81 one by one, which can improve the limiting effect of the pressure block 81 and prevent the pressure block 81 from offset in the limiting hole 61.

[0059] See also Figure 5 In some embodiments, the pressure plate 71 is connected to a first limiting protrusion 712, which can selectively abut against the middle cover plate 6 to limit the moving distance of the pressure plate 71; the pressure block 81 is connected to a second limiting protrusion 811, which can selectively abut against the mounting plate 83 to limit the moving distance of the pressure block 81.

[0060] Among them, the cross-sectional area of ​​the first limiting protrusion 712 is larger than the cross-sectional area of ​​the pressure plate 71, the first limiting protrusion 712 is arranged on the side of the pressure plate 71 facing the upper cover plate 4, and the middle cover plate 6 is provided with a groove (not shown in the figure) corresponding to the first limiting protrusion 712, so that the middle cover plate 6 and the pressure plate 71 can be selectively clamped; the cross-sectional area of ​​the second limiting protrusion 811 is larger than the cross-sectional area of ​​the pressure block 81, and a groove (not shown in the figure) is provided on the mounting plate 83 corresponding to the second limiting protrusion 811, so that the pressure block 81 and the mounting plate 83 can be selectively clamped.

[0061] In this way, the first limiting protrusion 712 and the second limiting protrusion 811 can respectively limit the moving distance of the pressure plate 71 and the pressure block 81, so that they are not easily moved excessively and fall off from the limiting hole 61 or the pressure hole 831, thereby improving the clamping stability of the multifunctional clamp, making the manufacturing accuracy of symmetrical batteries or three-electrode batteries higher, facilitating the manufacturing or testing of symmetrical batteries or three-electrode batteries, and improving the accuracy of the test and the stability of power supply.

[0062] See also Figure 5 In some embodiments, the multifunctional clamp further includes a first seal 91 and a second seal 92 , wherein the first seal 91 is disposed between the middle cover plate 6 and the lower base 3 , and the second seal 92 is disposed between the middle cover plate 6 and the upper cover plate 4 .

[0063] In this embodiment, the first seal 91 and the second seal 92 are both sealing rings made of rubber material. A groove (not shown in the figure) for limiting the first seal 91 is opened on the side of the lower base 3 facing the middle cover plate 6, and a groove (not shown in the figure) for limiting the second seal 92 is opened on the side of the middle cover plate 6 facing the upper cover plate 4.

[0064] In this way, when the diaphragm 2, the electrode piece 1 and the electrode ear 11 are assembled in place, the middle cover plate 6 and the upper cover plate 4 are assembled to the lower base 3 in turn. The first seal 91 and the second seal 92 can improve the sealing of the internal cavity of the multi-functional clamp, and prevent the electrolyte filled in the installation cavity 31 from leaking to the outside through the gap between the lower base 3 and the middle cover plate 6, and the gap between the middle cover plate 6 and the upper cover plate 4, thereby improving the manufacturing accuracy of the symmetrical battery.

[0065] See also Figure 5 In some embodiments, a connecting column 33 is provided on the side of the lower base 3 facing the middle cover plate 6, and a connecting hole 62 for inserting the connecting column 33 is opened at a position of the middle cover plate 6 corresponding to the connecting column 33, so as to limit the relative position of the middle cover plate 6 and the lower base 3; a guide column 713 is connected to the side of the pressure plate 71 facing the upper cover plate 4, and a guide hole 41 for inserting the guide column 713 is opened on the upper cover plate 4 corresponding to the guide column 713, so as to limit the relative position of the pressure plate 71 and the upper cover plate 4.

[0066] There are two connecting columns 33 , which are arranged along the diagonal line of the top surface of the lower base 3 ; there are two guide columns 713 , which are fixedly arranged at both ends of the pressure plate 71 .

[0067] In this way, the connecting column 33 slides in the connecting hole 62, which can limit the moving direction of the middle cover plate 6, so that the position of the middle cover plate 6 on the lower base 3 remains fixed; the guide column 713 slides in the guide hole 41, which can limit the moving direction of the pressure plate 71, so that the pressure plate 71 can stably apply vertical pressure to the diaphragm 2 and the pole piece 1, thereby improving the manufacturing accuracy and assembly efficiency of the symmetrical battery.

[0068] It is understandable that four connecting columns 33 can also be provided, so that four connecting columns 33 are arranged around the lower base 3, and the number of connecting columns 33 and guide columns 713 can be flexibly adjusted; the connecting columns 33 can also be provided on the middle cover plate 6, and the connecting holes 62 are opened on the lower base 3, and the guide columns 713 can also be provided on the upper cover plate 4, and the guide holes 41 are provided on the pressure plate 71, so as to realize rapid positioning and assembly of the middle cover plate 6 and the lower base 3, and the pressure plate 71 and the upper cover plate 4.

[0069] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A multifunctional clamp for clamping a pole piece (1) and a diaphragm (2), wherein the pole piece (1) and the diaphragm (2) are stacked, and the pole piece (1) is connected with a pole ear (11), characterized in that: The multifunctional fixture comprises: A lower base (3), wherein a side surface of the lower base (3) is provided with a mounting cavity (31) for accommodating the pole piece (1) and the diaphragm (2); An upper cover plate (4), the upper cover plate (4) being arranged on a side of the lower base (3) where the mounting cavity (31) is opened; A limiting member (5), the limiting member (5) being arranged in the installation cavity (31), and the limiting member (5) being used to accommodate the pole lug (11); A middle cover plate (6), the middle cover plate (6) being arranged between the lower base (3) and the upper cover plate (4), and the two ends of the middle cover plate (6) being detachably connected to the lower base (3) and the upper cover plate (4) respectively; a first pressurizing assembly (7), the first pressurizing assembly (7) being detachably connected to the middle cover plate (6) and being used to apply pressure to the pole piece (1) and the diaphragm (2); A second pressurizing assembly (8), the second pressurizing assembly (8) is detachably connected to the middle cover plate (6) and is used to apply pressure to the tab (11).

2. The multifunctional clamp according to claim 1, characterized in that: The first pressurizing component (7) comprises a pressurizing plate (71) and a first elastic member (72); the pressurizing plate (71) is detachably connected to the middle cover plate (6), and the pressurizing plate (71) moves relative to the middle cover plate (6); two ends of the first elastic member (72) are respectively in contact with the pressurizing plate (71) and the upper cover plate (4), so as to provide pressure to the pressurizing plate (71) so that the pressurizing plate (71) is in tight contact with the diaphragm (2).

3. The multifunctional clamp according to claim 2, characterized in that: The middle cover plate (6) is provided with a limiting hole (61), the cross-sectional area of ​​the limiting hole (61) is not less than the cross-sectional area of ​​the diaphragm (2), and the pressure plate (71) is slidably connected in the limiting hole (61).

4. The multifunctional clamp according to claim 1, characterized in that: The second pressurizing assembly (8) comprises a pressure block (81) and a second elastic member (82); the pressure block (81) is detachably connected to the middle cover plate (6), and the pressure block (81) moves relative to the middle cover plate (6); two ends of the second elastic member (82) are respectively in contact with the pressure block (81) and the middle cover plate (6), and are used to provide pressure to the pressure block (81) so that the pressure block (81) is in close contact with the pole lug (11).

5. The multifunctional clamp according to claim 4, characterized in that: The second pressurizing assembly (8) further comprises a mounting plate (83), wherein the mounting plate (83) is detachably connected to the middle cover plate (6), and the pressing block (81) is detachably connected to the mounting plate (83). The mounting plate (83) is provided with a pressurizing hole (831), and the pressing block (81) is slidably connected in the pressurizing hole (831).

6. The multifunctional clamp according to claim 1, characterized in that: The first pressurizing assembly (7) comprises a pressurizing plate (71) which can be selectively abutted against the diaphragm (2), the pressurizing plate (71) is slidably connected to the middle cover plate (6), the pressurizing plate (71) is connected to a first limiting protrusion (712), the first limiting protrusion (712) can be selectively abutted against the middle cover plate (6) to limit the movement distance of the pressurizing plate (71); and / or the second pressurizing assembly (8) comprises a pressing block (81) and a mounting plate (83), the pressing block (81) can be selectively abutted against the pole ear (11), the pressing block (81) is slidably connected to the mounting plate (83), the pressing block (81) is connected to a second limiting protrusion (811), the second limiting protrusion (811) can be selectively abutted against the mounting plate (83) to limit the movement distance of the pressing block (81).

7. The multifunctional clamp according to any one of claims 1 to 6, characterized in that: The multifunctional clamp further comprises a first sealing member (91), wherein the first sealing member (91) is arranged between the middle cover plate (6) and the lower base (3); and / or the multifunctional clamp further comprises a second sealing member (92), wherein the second sealing member (92) is arranged between the middle cover plate (6) and the upper cover plate (4).

8. The multifunctional clamp according to any one of claims 1 to 6, characterized in that: The limiting member (5) is provided with a limiting groove (51) for limiting the position of the pole lug (11) on the limiting member (5).

9. The multifunctional clamp according to claim 8, characterized in that: The lower base (3) is connected to a connecting wire (32), the limiting member (5) is connected to a metal connecting piece (52), the metal connecting piece (52) is located in the limiting groove (51) and is electrically connected to the connecting wire (32), and is used to electrically connect the pole ear (11) to the connecting wire (32).

10. The multifunctional clamp according to any one of claims 1 to 6, characterized in that: A connecting column (33) is provided on the side of the lower base (3) facing the middle cover (6), and a connecting hole (62) for inserting the connecting column (33) is provided on the middle cover (6) at a position corresponding to the connecting column (33), so as to limit the relative position of the middle cover (6) and the lower base (3); and / or the first pressurizing assembly (7) comprises a pressurizing plate (71) slidably connected to the middle cover (6), and a guide column (713) is connected on the side of the pressurizing plate (71) facing the upper cover (4), and a guide hole (41) for inserting the guide column (713) is provided on the upper cover (4) corresponding to the guide column (713), so as to limit the relative position of the pressurizing plate (71) and the upper cover (4).

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