Clamp structure and battery formation equipment
The clamp structure addresses the issue of battery tab deformation by allowing horizontal adjustment and secure positioning, ensuring compatibility with varying battery thicknesses and improving the formation process.
Patent Information
- Application Number
- CN202323471918.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-20
- Publication Date
- 2024-12-06
- Estimated Expiration
- 2033-12-20
AI Technical Summary
Existing clamps for battery formation can only adjust vertically and struggle to accommodate batteries of varying thicknesses, leading to deformation or indentation of battery tabs during the formation process.
A clamp structure with an adjustment component that includes an adjustment screw and shaft, allowing for horizontal adjustment of the distance between the formation and charging plates, featuring adjustable protrusions and locking mechanisms to secure the position, ensuring stability and versatility.
The clamp structure effectively prevents deformation of battery tabs by adjusting to battery thickness, enhancing versatility and stability during the formation process.
Smart Images
Figure CN222126648U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of polymer soft-pack lithium-ion battery formation clamping, and in particular relates to a clamp structure and battery formation equipment. Background Art
[0002] After the battery is manufactured, it is necessary to activate its internal positive and negative electrode materials through a certain charging and discharging method to improve the overall performance of the battery. This process is called battery formation. The quality of the formation determines the quality of the SEI film, which directly affects the battery's electrochemical properties such as cycle life, stability, self-discharge, and safety. The formation of the battery requires a long period of charging and discharging. When charging, it is necessary not only to accurately control the voltage or current of the charge and discharge, but also to accurately control the pulse waveform of the charge and discharge voltage and current to prevent the SEI film impedance from increasing, thereby affecting the rate discharge performance of the lithium-ion battery and improving the production efficiency of the formation process.
[0003] During the battery formation process, a clamp is needed to fix the battery cell and electrically connect its electrodes to the charging device for formation. However, most of the existing clamps can only achieve horizontal adjustment in the vertical direction, and the distance between the formation plate and the charging device is difficult to adjust. As a result, during the formation process, after the soft-pack lithium battery cell tabs are pressed together, when the thickness of the pressed soft-pack lithium battery cell is large, the tabs will be pulled, resulting in deformation or indentation. Therefore, it is urgent to propose a new technical solution to solve the above problems. Utility Model Content
[0004] One of the purposes of the utility model is to address the deficiencies of the prior art and provide a clamp structure which, by providing an adjustment component, can adjust the distance between the formation plate and the charging plate by rotating the adjustment shaft, which is convenient and practical.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A clamp structure comprises a formation plate, a charging plate and an adjustment component; the adjustment component comprises an adjustment screw and an adjustment shaft, the formation plate is provided with a first adjustment slot matching the adjustment screw and a second adjustment slot matching the adjustment shaft, the adjustment screw sleeve is provided with a first spring, and the adjustment shaft is provided with an adjustment piece; the charging plate covers the first adjustment slot and the second adjustment slot and abuts against the adjustment piece, and the charging plate is movably connected to the formation plate through the adjustment screw.
[0007] In practical application, it is only necessary to rotate the adjustment shaft to change the positional relationship between the adjustment member and the charging plate, thereby adjusting the distance between the formation plate and the charging plate.
[0008] As an improvement of the clamp structure described in the utility model, the adjustment member is provided with a plurality of protrusions along its circumference, and the protrusion heights of the plurality of protrusions relative to the plane where the formation plate is located are different. The protrusion height adjustment range is 0.5 mm to 5 mm, and can also be customized according to the battery size, thereby making the distance between the formation plate and the charging plate different, so that the clamp structure can be suitable for battery cells of different thicknesses, thereby increasing the practicality and versatility of the clamp structure.
[0009] As an improvement of the clamp structure described in the utility model, there are multiple adjusting members; or, there is one adjusting member, and multiple protrusions on the adjusting member are smoothly connected.
[0010] As an improvement of the clamp structure described in the utility model, the two ends of the adjustment shaft are respectively connected with a first locking member and a second locking member, and the first locking member and the second locking member are fixedly connected to the formation plate; the first locking member and the second locking member connect the adjustment shaft and the formation plate to avoid the adjustment shaft from shifting during the adjustment process, resulting in a decrease in adjustment accuracy, and at the same time increase the connection strength of the clamp structure.
[0011] As an improvement on the clamp structure described in the utility model, the first locking member and the second locking member are both provided with ball-end screws, and the first locking member and the second locking member are connected to the adjustment shaft through the ball-end screws, and steel balls are provided in the ball-end screws. Positioning holes matching the steel balls are respectively provided at both ends of the adjustment shaft. In actual application, when the adjustment shaft stops rotating, the steel balls are interference fit in the positioning holes, so that the adjustment shaft after adjustment is fixed in the second adjustment groove, thereby increasing the stability of the clamp structure.
[0012] As an improvement of the clamp structure described in the utility model, the adjustment sleeve is provided with a dial, and the dial is connected to the first locking piece through a fixing pin, and the fixing pin is pluggable. When the fixing pin is fixed to the first locking piece, the adjustment shaft cannot rotate, thereby further increasing the stability of the clamp structure; the setting of the dial facilitates visual observation and quantifies the distance between the formation plate and the charging plate.
[0013] As an improvement of the fixture structure described in the utility model, a groove is provided at one end of the adjustment shaft close to the dial, and the groove is used for an external part to rotate the adjustment shaft. The provision of the groove makes it more convenient to rotate the adjustment shaft.
[0014] As an improvement of the clamp structure described in the utility model, a fixing piece is installed at one end of the formation plate away from the first locking piece, the fixing piece is connected to the formation plate through a fixing rod, the charging plate is connected to the fixing piece through a fixing screw, and a second spring is sleeved on the fixing screw. The fixing screw and the adjustment screw are respectively sleeved with the second spring and the first spring, which can meet the space requirement for the rotation of the adjustment shaft while also meeting the connection requirement between the charging plate and the formation plate, thereby ensuring the realization of the basic function of the clamp structure for clamping the battery cell for formation.
[0015] As an improvement of the clamp structure described in the utility model, the clamp structure also includes a pole lug pressure block, the formation plate is provided with a first surface and a second surface relative to each other, the charging plate is installed on the first surface, the pole lug pressure block is installed on the second surface and is located in the second adjustment groove, the pole lug pressure block and the adjustment shaft are separated by a partition, a third spring is arranged in the pole lug pressure block, the third spring is in contact with the partition, and the third spring makes the pole lug pressure block universal.
[0016] The second purpose of the present utility model is to provide a battery formation device, including the clamp structure as described above.
[0017] The beneficial effect of the utility model is that the clamp structure of the utility model includes a formation plate, a charging plate and an adjustment component; the adjustment component includes an adjustment screw and an adjustment shaft, the formation plate is provided with a first adjustment slot matching the adjustment screw and a second adjustment slot matching the adjustment shaft, the adjustment screw sleeve is provided with a first spring, and the adjustment shaft is provided with an adjustment piece; the charging plate is covered with the first adjustment slot and the second adjustment slot and abuts against the adjustment piece, and the charging plate is movably connected to the formation plate through the adjustment screw. By setting an adjustment component, the utility model can adjust the distance between the formation plate and the charging plate by rotating the adjustment shaft, solve the problem that the distance between the formation charging plate and the pole ear of the soft-pack lithium battery increases with the thickness of the soft-pack lithium battery, and then prevent the pole ear from being pulled and deformed or indented during the formation process, thereby increasing the versatility of the clamp structure; and the adjustment method of the utility model is simple, and only the adjustment shaft needs to be rotated, which is convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
[0019] Figure 1 This is one of the structural schematic diagrams (first surface) of the first embodiment of the present invention.
[0020] Figure 2This is the second structural diagram of the first embodiment of the utility model (without a charging plate at one end).
[0021] Figure 3 for Figure 2 A schematic diagram of the structure at another angle in the dotted box A.
[0022] Figure 4 It is a schematic structural diagram of the adjustment shaft in the first embodiment of the utility model.
[0023] Figure 5 This is the third structural diagram (second surface) of the first embodiment of the utility model.
[0024] Figure 6 It is a schematic structural diagram of the adjustment shaft in the second embodiment of the utility model.
[0025] The reference numerals are described as follows:
[0026] 1. Forming plate; 11. First adjustment slot; 12. Second adjustment slot; 13. Fixing piece; 14. Fixing rod; 15. Fixing screw; 16. First surface; 17. Second surface; 18. Plate body; 19. Mounting part; 191. Mounting hole;
[0027] 2. Charging board;
[0028] 3. Adjustment assembly; 31. Adjustment screw; 32. Adjustment shaft; 321. Positioning hole; 322. Groove; 33. Adjustment piece; 331. Protrusion; 34. First locking piece; 35. Second locking piece; 36. Ball screw; 37. Scale plate; 38. Fixing pin;
[0029] 4. Tab pressing. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0031] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific implementation methods and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.
[0032] Reference to "embodiment" in this application means that a particular feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.
[0033] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0034] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.
[0035] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.
[0036] The term "plurality" used in the present application refers to two or more (including two).
[0037] In the present application, the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application are not limited to this.
[0038] During the first charge and discharge process of lithium-ion batteries, the polar aprotic solvent of lithium-ion batteries will inevitably react on the surface of the electrode and the electrolyte to form a passivation film covering the electrode surface, which is called an electronic insulating film or solid electrolyte membrane, namely SEI film. The formation of SEI film has a crucial impact on the performance of electrode materials. On the one hand, the formation of SEI film consumes part of the lithium ions, which increases the irreversible capacity of the first charge and discharge and reduces the charge and discharge efficiency of the electrode material; on the other hand, SEI film is insoluble in organic solvents and can exist stably in organic electrolyte solutions, and solvent molecules cannot pass through this passivation film, which can effectively prevent the co-embedding of solvent molecules and avoid the damage to the electrode material caused by the co-embedding of solvent molecules, thereby greatly improving the cycle performance and service life of the electrode.
[0039] The inventors found that the fixture used in the formation process can only move horizontally, and when the soft-pack lithium battery is placed in the hot pressing formation fixture, as the thickness of the soft-pack lithium battery increases, the distance between the tabs of the soft-pack lithium battery and the formation charging plate will also increase accordingly. In the formation process, after the tabs of the soft-pack lithium battery are pressed together, the tabs will be pulled, causing deformation or indentation, which will become more serious as the thickness of the soft-pack lithium battery increases.
[0040] In view of this, the embodiment of the present application provides a technical solution, which can adjust the distance between the charging plate and the formation plate by setting an adjustment component that is easy to operate, shorten the distance between the pole ear and the charging plate, and enable the clamp structure to avoid damage to the pole ear, making it suitable for most battery cells.
[0041] The following is combined with Figures 1 to 6 The utility model is further described in detail with specific implementation modes, but is not intended to limit the utility model.
[0042] Implementation Method 1
[0043] The following is combined with Figures 1 to 5 Description of Implementation Method 1
[0044] like Figure 1 As shown, a clamp structure includes a forming plate 1, a charging plate 2 and an adjustment component 3. The distance between the forming plate 1 and the charging plate 2 is adjusted by the adjustment component 3 to shorten the distance between the pole ear and the charging plate, so that the clamp structure can avoid the pole ear damage and make it suitable for most battery cells, thereby increasing the versatility of the clamp structure. In this embodiment, the adjustment component 3 is only arranged at one end of the forming plate 1. It can be understood that when pole ears extend from both ends of the battery cell to be formed, the adjustment components 3 are arranged at both ends of the forming plate 1 to ensure that the function of the clamp structure to avoid pole ear damage is realized.
[0045] Preferably, the adjustment component 3 includes an adjusting screw 31, which is sleeved with a first spring. A fixing part 13 is installed at one end of the formation plate 1 away from the adjusting screw 3. The fixing part 13 is connected to the formation plate 1 through a fixing rod 14. The charging plate 2 is connected to the fixing part 13 through a fixing screw 15. The fixing screw 15 is sleeved with a second spring. The charging plate 2 is movably connected to the formation plate 1 through the adjusting screw 31 and the fixing screw 15. The setting of the first spring and the second spring ensures that the distance between the formation plate 1 and the charging plate 2 can be adjusted. At the same time, when the adjustment shaft 32 is accidentally unable to rotate, the deformation of the first spring can be changed by pressing the adjusting screw 31 to restore the adjustment shaft 32 to its original position.
[0046] like Figure 4 As shown, the adjustment component 3 also includes an adjustment shaft 32. In this embodiment, the distance between the formation plate 1 and the charging plate 2 can be adjusted by rotating the adjustment shaft 32. A plurality of adjustment members 33 are arranged on the adjustment shaft 32. The distances between the plurality of adjustment members 33 are equal to ensure that there is no deviation when adjusting the distance between the formation plate 1 and the charging plate 2. The adjustment member 33 is provided with four protrusions 331 along its circumference. The height of the protrusions 331 of the four protrusions 331 is relative to the plane where the plate body 18 is located. In this embodiment, the specific protrusion height ranges from 0.5 mm to 5 mm, which can meet the formation clamping and fixing requirements of battery cells of various thicknesses. In some other embodiments, the number and protrusion height of the protrusions 331 can be adjusted according to actual conditions and are not specifically specified.
[0047] The two ends of the adjustment shaft 32 are respectively connected with the first locking member 34 and the second locking member 35, the first locking member 34 is arranged at one end close to the adjustment screw 3, the first locking member 34 and the second locking member 35 are fixedly connected to the formation plate 1, the first locking member 34 and the second locking member 35 have the same structure, and the arrangement of the two increases the connection strength between the formation plate 1 and the charging plate 2, thereby increasing the stability of the fixture structure; the first locking member 34 and the second locking member 35 are both provided with a ball screw 36, the first locking member 34 and the second locking member 35 are connected to the adjustment shaft 32 through the ball screw 36, and a steel ball is arranged in the ball screw 36, and a plurality of positioning holes 321 matching the steel balls are respectively arranged at the two ends of the adjustment shaft 32, and the plurality of positioning holes 321 are arranged around the shaft body of the adjustment shaft 32, when the adjustment shaft 32 stops rotating, the steel balls are bounced to the positioning holes 321 by the elastic structure inside the ball screw 36, and are interference fit with the positioning holes 321, thereby completing the fixation of the adjustment shaft 32 and increasing the stability of the fixture structure.
[0048] like Figure 3As shown, the adjustment shaft 32 is sleeved with a dial 37, and the dial 37 is connected to the first locking member 34 through a fixing pin 38. The dial 37 and the adjustment member 33 are matched and marked with scale lines, so that the adjusted distance between the formation plate 1 and the charging plate 2 can be quantified and easy to observe. The fixing pin 38 is pluggable. When the fixing pin 38 is inserted into the first locking member 24, the adjustment shaft 32 cannot rotate, which further increases the stability of the clamp structure.
[0049] like Figure 2 As shown, preferably, the formation plate 1 includes a plate body 18 and a mounting portion 19 extending from the plate body in all directions, and the mounting portion 19 is provided with a plurality of mounting holes 191; the mounting holes 191 are used for installing the fixture structure, and are used as mounting holes to install other components to control the movement of the fixture structure in the vertical direction.
[0050] Preferably, the formation plate 1 is provided with a first adjustment groove 11 matching the adjustment screw 31 and a second adjustment groove 12 matching the adjustment shaft 32, the charging plate 2 is covered with the first adjustment groove 11 and the second adjustment groove 12 and abuts against the adjustment piece 33, and the first adjustment groove 11 and the second adjustment groove 12 are both configured as through grooves for respectively installing the adjustment screw 31 and the adjustment shaft 32.
[0051] like Figure 5 As shown, the clamp structure also includes a tab press block 4, the formation plate 1 is provided with a first surface 16 and a second surface 17 relative to each other, the charging plate 2 is installed on the first surface 16, the tab press block 4 is installed on the second surface 17 and is located in the second adjustment groove 12, the tab press block 4 and the adjustment shaft are separated by a partition, a third spring is arranged in the tab press block 4, the third spring is abutted against the partition, and the arrangement of the third spring makes the tab press block 4 universal.
[0052] Implementation Method 2
[0053] like Figure 6 As shown, different from the first embodiment, an adjustment member is provided on the adjustment shaft 32 of this embodiment, and four protrusions 331 are provided along the circumference of the adjustment member 33. The four protrusions 331 have different heights, and the four protrusions 331 are smoothly connected, so that the adjustment shaft 32 can rotate smoothly, and at the same time, it can ensure the stability of adjusting the distance between the formation plate 1 and the charging plate 2, and prevent the charging plate 2 from tilting and damaging the pole ear.
[0054] The other structures are the same as those in the first embodiment and will not be described again here.
[0055] Implementation Method 3
[0056] A battery formation device includes the clamp structure of the first embodiment or the second embodiment. It can be understood that the battery formation device includes a plurality of clamp structures to clamp and form a battery cell to be formed.
[0057] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.
Claims
1. A fixture structure, It is characterized in that The invention comprises a formation plate (1), a charging plate (2) and an adjustment component (3); the adjustment component (3) comprises an adjustment screw (31) and an adjustment shaft (32); the formation plate (1) is provided with a first adjustment slot (11) matching the adjustment screw (31) and a second adjustment slot (12) matching the adjustment shaft (32); the adjustment screw (31) is sleeved with a first spring; the adjustment shaft (32) is provided with an adjustment member (33); the charging plate (2) covers the first adjustment slot (11) and the second adjustment slot (12) and abuts against the adjustment member (33); the charging plate (2) is movably connected to the formation plate (1) via the adjustment screw (31).
2. The clamp structure according to claim 1, It is characterized in that The adjusting member (33) is provided with a plurality of protrusions (331) along its circumference, and the protrusion heights of the plurality of protrusions (331) relative to the plane where the formation plate (1) is located are different.
3. The clamp structure according to claim 2, It is characterized in that The adjusting member (33) is provided in plurality; Alternatively, the adjusting member (33) is provided with one, and the plurality of protrusions (331) on the adjusting member (33) are smoothly connected.
4. The clamp structure according to claim 1, It is characterized in that The two ends of the adjustment shaft (32) are respectively connected to a first locking member (34) and a second locking member (35), and the first locking member (34) and the second locking member (35) are fixedly connected to the formation plate (1).
5. The clamp structure according to claim 4, It is characterized in that The first locking member (34) and the second locking member (35) are both provided with a ball screw (36), and the first locking member (34) and the second locking member (35) are connected to the adjustment shaft (32) via the ball screw (36), a steel ball is provided inside the ball screw (36), and positioning holes (321) matching the steel ball are respectively provided at both ends of the adjustment shaft (32).
6. The clamp structure according to claim 4, It is characterized in that The adjustment shaft (32) is sleeved with a scale plate (37), and the scale plate (37) is connected to the first locking member (34) via a fixing pin (38).
7. The clamp structure according to claim 6, It is characterized in that A groove (322) is provided at one end of the adjustment shaft (32) close to the scale plate (37), and the groove (322) is used for an external part to rotate the adjustment shaft (32).
8. The clamp structure according to claim 4, It is characterized in that A fixing member (13) is mounted on one end of the formation plate (1) away from the first locking member (34); the fixing member (13) is connected to the formation plate (1) via a fixing rod (14); the charging plate (2) is connected to the fixing member (13) via a fixing screw (15); a second spring is sleeved on the fixing screw (15).
9. The clamp structure according to claim 1, It is characterized in that The invention also comprises a tab pressing block (4), the formation plate (1) being provided with a first surface (16) and a second surface (17) opposite to each other, the charging plate (2) being mounted on the first surface (16), the tab pressing block (4) being mounted on the second surface (17) and being located in the second adjustment groove (12), the tab pressing block (4) and the adjustment shaft (32) being separated by a partition, a third spring being arranged in the tab pressing block (4), and the third spring being in contact with the partition.
10. A battery formation device, It is characterized in that Comprising the clamp structure as described in any one of claims 1-9.