Roll core structure, energy storage device, electric equipment and roll core structure processing method

Abstract

The invention relates to a roll core structure, an energy storage device, electric equipment and a roll core structure processing method. The processing method comprises the following steps: flattening the pole piece; carrying out equidistant seamless shearing on the end part of the pole piece along the first direction of the pole piece, forming first cutting lines and second cutting lines which are alternately arranged in parallel, and first tabs and second tabs which are adjacently arranged, and enabling one end point of each first cutting line to fall into an interval of two ends of the adjacent second cutting line in the first direction; winding the pole piece around the central axis to form a winding body, and while winding, sequentially and alternately bending inwards towards the central axis and flattening the first tab and the second tab; sticking ending glue around the central axis in the circumferential direction of the winding body; the current collecting plate is pressed against the first tab and the second tab; and insulating glue is adhered along the bent edge. According to the method, the first tab and the second tab form a mutually lapped and pressed structure, and warping is prevented through the mutual pressing and restraining effect of the first tab and the second tab.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a winding core structure, an energy storage device, an electrical device, and a winding core structure processing method. Background Art

[0002] With the development of battery cell technology, cylindrical batteries have emerged. Cylindrical batteries include a positively charged shell and a negative electrode winding core. Among them, the tabs of the negative electrode winding core need to be bent and flattened and then welded to the negative electrode collector.

[0003] However, in the related art, the negative electrode current collector of the cylindrical battery generally cannot completely cover the negative electrode tab, and since the negative electrode tab is made of metal, it has ductility and a certain degree of resilience. Therefore, the negative electrode tab will warp up after being flattened, causing part of the structure of the negative electrode tab to overlap with the shell, thereby causing a short circuit. Summary of the invention

[0004] Based on this, it is necessary to provide a winding core structure, energy storage device, electrical equipment and winding core structure processing method to address the problem in the related technology that the negative electrode tab will warp up after being flattened, causing part of the structure of the negative electrode tab to overlap with the shell and cause a short circuit.

[0005] On the one hand, the present application provides a winding core structure processing method, first providing a pole piece, the winding core structure processing method comprising the following steps:

[0006] Flattening the pole piece;

[0007] Performing equidistant and seamless shearing of the ends of the pole piece along the first direction thereof, and forming first cutting lines and second cutting lines arranged alternately and parallel to each other, and first pole tabs and second pole tabs arranged adjacently, and making one of the end points of the first cutting line fall within the interval between the two ends of the adjacent second cutting line in the first direction;

[0008] Winding the pole piece around a central axis perpendicular to the first direction to form a winding body, and while winding, alternately bending and flattening the first pole tab and the second pole tab inwardly toward the central axis;

[0009] Adhere a finishing adhesive around the central axis in the circumferential direction of the winding body;

[0010] Pressing the current collecting plate against the first pole lug and the second pole lug;

[0011] Insulating glue is pasted along the bent edges of the first pole tab and the second pole tab.

[0012] The above-mentioned winding core structure processing method adopts a method of winding the pole piece while alternately bending and flattening the first pole ear and the second pole ear, so that the first pole ear and the second pole ear form a structure that overlaps and presses each other, and then when the collector plate presses against the first pole ear and the second pole ear, the first pole ear and the second pole ear can effectively reduce the warping phenomenon under the mutual constraint and the pressing action of the collector plate. In addition, since the first pole ear and the second pole ear form a structure that overlaps and abuts each other, in the case that the collector plate cannot completely cover the first pole ear and the second pole ear, the first pole ear and the second pole ear can also prevent warping through the mutual pressing constraint of their own structure, thereby helping to reduce the risk of the first pole ear or the second pole ear overlapping the shell and causing a short circuit.

[0013] In one embodiment, the step of winding the pole piece around a central axis perpendicular to the first direction to form a winding body, and bending and flattening the first pole ear and the second pole ear inwardly toward the central axis while winding, includes the steps of:

[0014] Bend the first pole tab and the second pole tab at a preset angle toward the same side perpendicular to the flattened plane of the pole piece;

[0015] The pole piece is wound around the central axis to form a winding body, and the first pole tab and the second pole tab are flattened one by one along a direction parallel to the central axis by using a flattening device during the winding.

[0016] On the other hand, the present application provides a winding core structure, which is made by the above-mentioned winding core structure processing method. The winding core structure includes a winding body and a current collecting plate. One end of the winding body has a first pole ear and a second pole ear that are bent toward the central axis of the winding body and partially overlap. The current collecting plate is pressed against the first pole ear and the second pole ear.

[0017] In the winding core structure, the first pole ear and the second pole ear form a structure that overlaps and presses each other, so the first pole ear and the second pole ear can effectively reduce the warping phenomenon under the mutual constraint of their own structures and the pressure of the collector plate, thereby reducing the risk of the first pole ear and the second pole ear warping and overlapping the shell to cause a short circuit. In addition, because the first pole ear and the second pole ear form a structure that overlaps and presses each other, in the case that the collector plate cannot completely cover the first pole ear and the second pole ear, the first pole ear and the second pole ear can also prevent warping through the mutual pressure constraint of their own structures.

[0018] On the other hand, the present application also provides an energy storage device, including the above-mentioned winding core structure, the energy storage device also includes a shell and a lower plastic part, the winding core structure is arranged in the shell, the lower plastic part is arranged on the side of the collecting disk away from the winding body, and the lower plastic part is provided with at least two pressing structures, and the pressing structure is in contact with the first pole ear and / or the second pole ear.

[0019] The energy storage device can further prevent the first pole ear and the second pole ear from warping by abutting the pressing structure against the first pole ear or the second pole ear, or by abutting the pressing structure against the first pole ear or the second pole ear at the same time, thereby improving the safety of the energy storage device.

[0020] In one of the embodiments, the pressing structure is evenly distributed along the circumferential surface of the lower plastic part, and the collecting plate is provided with an avoidance groove corresponding to the pressing structure along its circumferential edge, and the pressing structure passes through the avoidance groove and abuts against the first pole ear and / or the second pole ear.

[0021] In one embodiment, the pressing structure includes an injection body and a convex column, the injection body has a first accommodating cavity, the convex column is embedded in the first accommodating cavity, and the convex column is movably connected to the injection body, and the lower plastic part is provided with an injection channel, and the injection channel is connected to the first accommodating cavity.

[0022] In one embodiment, the convex column is hollow and has a second accommodating cavity, the injection body is provided with a liquid inlet hole, the first accommodating cavity is connected to the injection channel through the liquid inlet hole, the second accommodating cavity is connected to the first accommodating cavity, and the end of the convex column away from the liquid inlet hole is provided with a liquid outlet hole, and the aperture of the liquid outlet hole is smaller than the aperture of the liquid inlet hole.

[0023] In one embodiment, the convex cylinder has a first end and a second end, the convex cylinder is provided with a clamping flange at the first end, and the injection body is provided with a first clamping groove and a second clamping groove at intervals along its axial direction.

[0024] In one embodiment, a first guide arc is provided on the side of the snap-in flange facing the second end, and a second guide arc is provided on the edge of the slot of the first snap-in slot. When the snap-in flange is snap-into the first snap-in slot, the first guide arc and the second guide arc abut against each other.

[0025] In one embodiment, a first clamping plane is provided on the side of the clamping flange facing away from the first guide arc, and the second clamping slot has a second clamping plane. When the clamping flange is clamped in the second clamping slot, the first clamping plane and the second clamping plane abut against each other.

[0026] On the other hand, the present application also provides an electrical equipment, including the above-mentioned energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG. 1 is a schematic diagram of the unfolded structure of a winding body with a winding core structure in one embodiment of the present application.

[0028] FIG. 2 is a schematic structural diagram of a winding core structure in one embodiment of the present application.

[0029] FIG3 is a schematic diagram of a structure in which a first pole tab and a second pole tab of a pole piece are overlapped with each other in a wound state in one embodiment of the present application.

[0030] FIG. 4 is a schematic diagram of the structure of an energy storage device in one embodiment of the present application.

[0031] FIG. 5 is a schematic structural diagram of the energy storage device shown in FIG. 4 with the shell removed.

[0032] FIG. 6 is a schematic diagram of a partial structure of the energy storage device shown in FIG. 5 .

[0033] FIG. 7 is a cross-sectional view of the structure shown in FIG. 6 at AA.

[0034] FIG. 8 is an enlarged view of the cross-sectional view at point B shown in FIG. 7 .

[0035] FIG. 9 is an enlarged view of the cross-sectional view at point C shown in FIG. 7 .

[0036] Description of Figure Numbers

[0037] 10. Energy storage device; 11. Winding core structure; 111. Winding body; 112. Collecting plate; 1121. Avoidance groove; 113. Finishing glue; 114. Insulating glue; 12. Shell; 13. Pole piece; 131. First pole ear; 132. Second pole ear; 13a. First cutting line; 13b. Second cutting line; 13c. Bending edge; 14. Lower plastic part; 141. Liquid injection channel; 15. Pressing structure; 151. Liquid injection Main body; 151a, first accommodating cavity; 1511, first clamping groove; 1511a, second guide arc; 1512, second clamping groove; 1512a, second clamping plane; 1513, liquid inlet hole; 152, convex cylinder; 152a, second accommodating cavity; 152b, first end; 152c, second end; 1521, clamping flange; 1521a, first guide arc; 1521b, first clamping plane; 1522, liquid outlet hole. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0044] Referring to FIGS. 1 to 3 , on the one hand, the present application provides a method for processing a core structure, comprising the following steps:

[0045] Flattening the pole piece 13;

[0046] The ends of the pole piece 13 are seamlessly cut at equal distances along the first direction thereof, and first cutting lines 13a and second cutting lines 13b are arranged alternately and parallel to each other, and first pole tabs 131 and second pole tabs 132 are arranged adjacently, and one end point of the first cutting line 13a falls within the interval between the two ends of the adjacent second cutting line 13b in the first direction;

[0047] The pole piece 13 is wound around a central axis L perpendicular to the first direction to form a winding body 111, and the first pole tab 131 and the second pole tab 132 are alternately bent and flattened inwardly toward the central axis L during the winding;

[0048] A finishing adhesive 113 is pasted on the circumference of the winding body 111 around the central axis L;

[0049] Press the current collecting plate 112 against the first pole lug 131 and the second pole lug 132;

[0050] The insulating adhesive 114 is pasted along the bent edges 13 c of the first electrode tab 131 and the second electrode tab 132 .

[0051] Specifically, referring to FIG1 , the two ends of the first cutting line 13a are the first highest point a1 and the first lowest point a2, respectively, and the two ends of the second cutting line 13b are the second highest point b1 and the second lowest point b2, respectively. The above “one of the endpoints of the first cutting line 13a falls within the interval of the two ends of the adjacent second cutting line 13b in the first direction” means that along the second direction Y perpendicular to the first direction X, the first highest point a2 falls within the interval d between the second highest point b1 and the second lowest point b2 on the adjacent side in the first direction X, or the first lowest point a2 falls within the interval d between the second highest point b1 and the second lowest point b2 on the adjacent side in the first direction X.

[0052] The above-mentioned winding core structure processing method adopts a method of winding the pole piece 13 while alternately bending and flattening the first pole ear 131 and the second pole ear 132, so that the first pole ear 131 and the second pole ear 132 form a structure that overlaps and presses each other, and then when the current collecting plate 112 presses against the first pole ear 131 and the second pole ear 132, the first pole ear 131 and the second pole ear 132 can effectively reduce the warping phenomenon under the mutual constraint of their own structures and the pressing action of the current collecting plate 112. In addition, since the first pole ear 131 and the second pole ear 132 form a structure that overlaps and presses each other, in the case that the current collecting plate 112 cannot completely cover the first pole ear 131 and the second pole ear 132, the first pole ear 131 and the second pole ear 132 can also prevent warping through the mutual pressing constraint of their own structures, thereby helping to reduce the risk of the first pole ear 131 or the second pole ear 132 overlapping the shell 12 and causing a short circuit.

[0053] Furthermore, the above-mentioned winding core structure processing method first adopts the processing sequence of pressing the collecting plate 112 against the first pole ear 131 and the second pole ear 132, and then pasting the insulating glue 114 along the bent edges 13c of the first pole ear 131 and the second pole ear 132. In this way, the first pole ear 131 and the second pole ear 132 can be kept in a restrained and non-warping state before pasting the insulating glue 114, which helps to avoid the first pole ear 131 or the second pole ear 132 from being accidentally adhered to the insulating glue 114 and causing warping when pasting the insulating glue 114.

[0054] It should be noted that, in combination with FIGS. 1 to 3 , after the first pole lug 131 and the second pole lug 132 are bent toward the central axis L, the bent edge 13c thereof is in an arc shape around the central axis L. In general, the winding body 111 formed by winding the pole piece 13 has a multi-layer stacked winding structure, and the diameter of a layer farther from the central axis L is larger, and the corresponding curvature is lower. Therefore, the curvature of the bending edge 13c corresponding to the first pole lug 131 and the second pole lug 132 located closer to the outer layer is lower, so that the overlapping area of ​​the first pole lug 131 and the second pole lug 132 after bending is smaller, so the mutual pressing constraint effect of the first pole lug 131 and the second pole lug 132 located closer to the outer layer is worse.

[0055] Therefore, the above-mentioned core structure processing method can also optimize the situation where the mutual constraint effect of the first pole ear 131 and the second pole ear 132 is worse as they are closer to the outer layer through the setting of "one of the end points of the first cutting line 13a falls within the interval between the two ends of the adjacent second cutting line 13b in the first direction X", so that the first pole ear 131 and the second pole ear 132 placed in the outer layer have sufficient overlapping and covering area after bending, thereby enabling the adjacent first pole ear 131 and the second pole ear 132 to achieve a good mutual pressure constraint effect.

[0056] Furthermore, the above-mentioned winding core structure processing method adopts a seamless cutting method at the end of the pole piece 13, that is, there is no need to cut off part of the structure between the adjacent first pole ear 131 and the second pole ear 132, which can ensure the integrity of the pole ear structure and maximize the structural area, thereby helping to improve the conductive effect of the first pole ear 131 and the second pole ear 132.

[0057] In some embodiments, the step of “winding the pole piece 13 around the central axis L perpendicular to the first direction X to form a winding body 111, and bending and flattening the first pole ear 131 and the second pole ear 132 inwardly toward the central axis L while winding” includes the steps of:

[0058] The first electrode tab 131 and the second electrode tab 132 are bent at a preset angle toward the same side perpendicular to the flattened plane of the electrode sheet 13 .

[0059] The pole piece 13 is wound around the central axis L to form a winding body 111 , and the first pole tab 131 and the second pole tab 132 are flattened one by one along a direction parallel to the central axis L by using a flattening device during the winding process.

[0060] In this embodiment, the first pole ear 131 and the second pole ear 132 are bent at a preset angle toward the same side perpendicular to the flattened plane of the pole piece 13, that is, the first pole ear 131 and the second pole ear 132 are pre-folded at a small angle, so that the flattening device can bend and flatten the first pole ear 131 and the second pole ear 132 in a direction parallel to the central axis L, thereby greatly improving the processing efficiency.

[0061] Specifically, by pre-folding the first pole tab 131 and the second pole tab 132, after the pole piece 13 is wound, the first pole tab 131 or the second pole tab 132 can be bent a small portion toward the central axis L, so that the flattening device can abut the bent portion of the first pole tab 131 or the second pole tab 132 in a direction parallel to the central axis L, and then in the process of the flattening device continuing to move in a direction parallel to the central axis L, the first pole tab 131 or the second pole tab 132 can be further bent toward the central axis L and finally flattened. Therefore, by pre-folding the first pole tab 131 and the second pole tab 132, the bending and flattening actions can be combined, which helps to improve processing efficiency.

[0062] In addition, in this embodiment, the pole piece 13 is wound while the flattening device flattens it, so that there is a relative contact friction movement in the circumferential direction between the flattening device and the first pole ear and the second pole ear, so that a "flattening" effect can be achieved, which helps to form a process guide for the first pole ear 131 and the second pole ear 132, and improve the mutual fitting effect of the first pole ear 131 and the second pole ear 132.

[0063] On the other hand, the present application also provides a winding core structure 11. The winding core structure 11 is made by the above-mentioned winding core structure processing method. As shown in FIG5 , the winding core structure 11 includes a winding body 111 and a current collecting plate 112, one end of the winding body 111 has a first pole ear 131 and a second pole ear 132 that are bent toward the central axis L of the winding body 111 and overlapped with each other, and the current collecting plate 112 is pressed against the first pole ear 131 and the second pole ear 132.

[0064] In the winding core structure 11, the first pole lug 131 and the second pole lug 132 form a structure that overlaps and presses each other in part, so the first pole lug 131 and the second pole lug 132 can effectively reduce the warping phenomenon under the mutual constraint of their own structures and the pressing action of the current collecting plate 112, thereby reducing the risk of the first pole lug 131 and the second pole lug 132 warping and overlapping the shell 12 to cause a short circuit. In addition, since the first pole lug 131 and the second pole lug 132 form a structure that overlaps and presses each other, in the case that the current collecting plate 112 cannot completely cover the first pole lug 131 and the second pole lug 132, the first pole lug 131 and the second pole lug 132 can also prevent warping through the mutual pressing constraint of their own structures.

[0065] On the other hand, in combination with FIG. 4 and FIG. 5 , in one embodiment, the present application further provides an energy storage device 10, comprising the above-mentioned winding core structure 11. The energy storage device 10 also includes a shell 12 and a lower plastic part 14. The winding core structure 11 is disposed in the shell 12, and the lower plastic part 14 is disposed on the side of the collecting disk 112 away from the winding body 111. The lower plastic part 14 is provided with at least two pressing structures 15, and the pressing structure 15 is in contact with the first pole ear 131 and / or the second pole ear 132, so that the first pole ear 131 and the second pole ear 132 can be further prevented from warping.

[0066] The energy storage device 10 can further prevent the first pole ear 131 and the second pole ear 132 from warping by abutting the pressing structure 15 against the first pole ear 131 or the second pole ear 132 , or by abutting the pressing structure 15 against the first pole ear 131 or the second pole ear 132 at the same time, thereby improving the safety of the energy storage device 10 .

[0067] Referring to FIG. 6 , in some embodiments, the pressing structure 15 is evenly distributed along the circumferential surface of the lower plastic part 14 , and the current collecting plate 112 is provided with an avoidance groove 1121 corresponding to the pressing structure 15 along its circumferential edge. The pressing structure 15 passes through the avoidance groove 1121 and abuts against the first pole ear 131 and / or the second pole ear 132 , thereby optimizing the assembly relationship between the pressing structure 15 and the current collecting plate 112 and improving the compactness of the assembly structure of the pressing structure 15 and the current collecting plate 112 .

[0068] Specifically, when the current collecting disk 112 of the energy storage device 10 abuts against the first pole lug 131 and the second pole lug 132, since the current collecting disk 112 has various protruding structures on its surface, it is difficult for the current collecting disk 112 to completely cover or completely press against the first pole lug 131 and the second pole lug 132. In this embodiment, the lower plastic part 14 is provided with uniformly distributed pressing structures 15 along its circumferential surface, and the current collecting disk 112 is provided with avoidance grooves 1121 corresponding to the pressing structures 15 along its circumferential edge, so that the problem of insufficient pressing effect of the current collecting disk 112 on the first pole lug 131 and the second pole lug 132 can be effectively solved without affecting the assembly of the current collecting disk 112 with the first pole lug 131 and the second pole lug 132.

[0069] In addition, the arrangement of the avoidance groove 1121 corresponding to the pressing structure 15 along the circumferential edge of the collecting plate 112 also helps to position the collecting plate 112 .

[0070] Specifically, the collecting plate 112 may be, but is not limited to, a circular thin sheet. If no relevant positioning guide structure is provided to fix it during the installation process, the collecting plate 112 will rotate inside the energy storage device 10, and the energy storage device 10 is provided with an exhaust hole for explosion prevention, which may cause the exhaust hole of the energy storage device 10 to be blocked, affecting the explosion-proof performance of the energy storage device 10. Therefore, the collecting plate 112 is provided with an avoidance groove 1121 corresponding to the pressing structure 15 along its circumferential edge, which, on the one hand, helps to play a positioning role during installation and welding, ensuring that the exhaust hole position corresponds to the explosion-proof valve, and on the other hand, can fix the collecting plate 112 to prevent it from rotating.

[0071] Continuing to refer to FIG. 6 and FIG. 7 , in some embodiments, the pressing structure 15 includes a liquid injection body 151 and a convex cylinder 152. The liquid injection body 151 has a first accommodating cavity 151a, and the convex cylinder 152 is embedded in the first accommodating cavity 151a, and the convex cylinder 152 is movably connected to the liquid injection body 151. The lower plastic part 14 is provided with a liquid injection channel 141, and the liquid injection channel 141 is connected to the first accommodating cavity 151a.

[0072] Specifically, the injection channel 141 is used to introduce electrolyte, and the electrolyte is introduced into the first accommodating cavity 151a of the injection body 151, so that the convex column 152 can move relative to the injection body 151 under the hydraulic action of the electrolyte, and protrude the injection body 151 in the direction close to the first pole ear 131 and the second pole ear 132 to press the first pole ear 131 and the second pole ear 132, thereby preventing the first pole ear 131 and the second pole ear 132 from warping.

[0073] In this embodiment, the convex cylinder 152 can be extended and retracted in the liquid injection body 151, so that when the energy storage device 10 is performing the liquid injection process, the first pole ear 131 and the second pole ear 132 can be pressed and restrained at the same time. It can be understood that before the liquid injection, the lower plastic part 14 of the energy storage device 10 needs to be assembled and fixed before the liquid injection.

[0074] Specifically, compared with some embodiments that are simply provided with a protruding mechanism (it should be noted that the "protruding mechanism" mentioned here refers to a column or block without a telescopic function), that is, the protruding mechanism is evenly provided along the circumference of the lower plastic part 14 for pressing the negative electrode tab, it is necessary to fix the lower plastic part 14 to maintain the pressing effect of the protruding mechanism when the protruding mechanism presses the negative electrode tab. However, in the process of fixing the lower plastic part 14, it is easy to have an installation gap, causing the protruding mechanism to loosen and not be pressed in place; or due to the inconsistent pressing force of each protruding mechanism, it is easy to cause the lower plastic part 14 to be assembled in place, which in turn causes the problem of the protruding mechanism pressing and unloading force. In contrast, in the embodiment of "the convex column 152 can be extended and retracted in the injection body 151" provided in the present application, the convex column 152 can be raised to press the first pole ear 131 and the second pole ear 132 on the premise that the lower plastic part 14 is assembled and fixed, thereby effectively avoiding the problem of pressure failure caused by the assembly and installation of the lower plastic part 14.

[0075] Continuing to refer to FIG. 7 , in some embodiments, the convex cylinder 152 is hollow and has a second accommodating chamber 152a, the liquid injection body 151 is provided with a liquid inlet hole 1513, the first accommodating chamber 151a is communicated with the liquid injection channel 141 through the liquid inlet hole 1513, the second accommodating chamber 152a is communicated with the first accommodating chamber 151a, and the end of the convex cylinder 152 away from the liquid inlet hole 1513 is provided with a liquid outlet hole 1522, the aperture of the liquid outlet hole 1522 is smaller than the aperture of the liquid inlet hole 1513, so that the flow rate of the electrolyte entering the liquid inlet hole 1513 can be greater than the flow rate of the electrolyte leaving the liquid outlet hole 1522, thereby making the convex cylinder 152 move relative to the liquid injection body 151 under the hydraulic action of the flow difference, ensuring that the convex cylinder 152 can smoothly protrude from the liquid injection body 151 to press the first pole ear 131 and the second pole ear 132.

[0076] As shown in combination with FIG. 7 to FIG. 9 , in some embodiments, the convex cylinder 152 has a first end 152b and a second end 152c. The convex cylinder 152 is provided with a snap-fit ​​flange 1521 at the position of the first end 152b. The liquid injection body 151 is provided with a first snap-fit ​​groove 1511 and a second snap-fit ​​groove 1512 (as shown in combination with FIG. 8 and FIG. 9 , respectively) along its axial direction. The snap-fit ​​flange 1521 can be snap-fitted to the first snap-fit ​​groove 1511 and the second snap-fit ​​groove 1512, respectively, so that the convex cylinder 152 can be positioned and snap-fitted to the first snap-fit ​​groove 1511 through the snap-fit ​​flange 1521 when not working; in addition, when the convex cylinder 152 is working, it can be positioned and snap-fitted to the second snap-fit ​​groove 1512 through the snap-fit ​​flange 1521 to maintain the pressing effect on the first pole ear 131 and the second pole ear 132.

[0077] In addition, the collecting plate 112 may be, but is not limited to, a circular thin sheet. If no relevant positioning guide structure is provided to fix it during the installation process, the collecting plate 112 will rotate inside the energy storage device 10, and the energy storage device 10 is provided with an exhaust hole for explosion prevention, which may cause the exhaust hole of the energy storage device 10 to be blocked, affecting the explosion-proof performance of the energy storage device 10. Therefore, the arrangement of the clamping flange 1521 provided at the first end 152b of the convex cylinder 152 to clamp and position the convex cylinder 152 can also play a role in fixing the collecting plate 112 to prevent it from rotating, which helps to prevent the exhaust hole from being blocked and improves the safety of the energy storage device 10.

[0078] Continuing to refer to Figures 7-9, in some embodiments, a first guide arc 1521a is provided on the side of the snap-in flange 1521 facing the second end 152c, and a second guide arc 1511a is provided on the edge of the slot of the first snap-in groove 1511. When the snap-in flange 1521 is snapped into the first snap-in groove 1511, the first guide arc 1521a and the second guide arc 1511a abut against each other.

[0079] Specifically, in this embodiment, the convex cylinder 152 is clamped in the liquid injection body 151 by means of an interference fit between the clamping flange 1521 and the liquid injection body 151. Therefore, the mutual abutment and fit between the first guide arc 1521a and the second guide arc 1511a facilitates the convex cylinder 152 to be smoothly ejected in the first clamping groove 1511, thereby improving the working reliability of the energy storage device 10.

[0080] Referring to Figure 9, in some embodiments, a first clamping plane 1521b is provided on the side of the clamping flange 1521 away from the first guide arc 1521a, and the second clamping groove 1512 has a second clamping plane 1512a. When the clamping flange 1521 is clamped in the second clamping groove 1512, the first clamping plane 1521b and the second clamping plane 1512a abut against each other to clamp the clamping flange 1521 in the second clamping groove 1512, so as to prevent the clamping flange 1521 of the convex column 152 from sliding toward the first end 152b and falling to the bottom of the re-injection liquid body 151, thereby maintaining the pressing effect of the convex column 152 on the first pole ear 131 and the second pole ear 132.

[0081] The present application also provides an electrical device, comprising the above-mentioned energy storage device 10.

[0082] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A method for processing a core structure, characterized in that: A pole piece is provided, and the winding core structure processing method comprises the following steps: Flattening the pole piece; Performing equidistant and seamless shearing of the ends of the pole piece along the first direction thereof, and forming first cutting lines and second cutting lines arranged alternately and parallel to each other, and first pole tabs and second pole tabs arranged adjacently, and making one of the end points of the first cutting line fall within the interval between the two ends of the adjacent second cutting line in the first direction; Winding the pole piece around a central axis perpendicular to the first direction to form a winding body, and while winding, alternately bending and flattening the first pole tab and the second pole tab inwardly toward the central axis; Adhere a finishing adhesive around the central axis in the circumferential direction of the winding body; Pressing the current collecting plate against the first pole lug and the second pole lug; Insulating glue is pasted along the bent edges of the first pole tab and the second pole tab.

2. The method for processing a winding core structure according to claim 1, characterized in that: The step of winding the pole piece around a central axis perpendicular to the first direction to form a winding body, and bending and flattening the first pole ear and the second pole ear inwardly toward the central axis while winding, includes the steps of: Bend the first pole tab and the second pole tab at a preset angle toward the same side perpendicular to the flattened plane of the pole piece; The pole piece is wound around the central axis to form a winding body, and the first pole tab and the second pole tab are flattened one by one along a direction parallel to the central axis by using a flattening device during the winding.

3. A winding core structure, characterized in that: The winding core structure is manufactured by the winding core structure processing method according to claim 1 or 2, wherein the winding core structure includes a winding body and a current collecting disk, one end of the winding body has a first pole ear and a second pole ear that are bent toward the central axis of the winding body and partially overlap, and the current collecting disk is pressed against the first pole ear and the second pole ear.

4. An energy storage device, comprising the winding core structure according to claim 3, characterized in that: The energy storage device also includes a shell and a lower plastic part. The winding core structure is arranged in the shell. The lower plastic part is arranged on the side of the collecting disk away from the winding body. The lower plastic part is provided with at least two pressing structures, and the pressing structures are in contact with the first pole ear and / or the second pole ear.

5. The energy storage device according to claim 4, characterized in that: The pressing structures are evenly distributed along the circumferential surface of the lower plastic part, and the current collecting plate is provided with avoidance grooves corresponding to the pressing structures along its circumferential edge. The pressing structures pass through the avoidance grooves and abut against the first pole lug and / or the second pole lug.

6. The energy storage device according to claim 4 or 5, characterized in that: The pressing structure includes a liquid injection body and a convex column, the liquid injection body has a first accommodating cavity, the convex column is embedded in the first accommodating cavity, and the convex column is movably connected to the liquid injection body, the lower plastic part is provided with a liquid injection channel, and the liquid injection channel is connected to the first accommodating cavity.

7. The energy storage device according to claim 6, characterized in that: The convex column has a hollow structure and has a second accommodating cavity. The injection body is provided with a liquid inlet hole. The first accommodating cavity is connected to the injection channel through the liquid inlet hole. The second accommodating cavity is connected to the first accommodating cavity. The convex column is provided with a liquid outlet hole at one end away from the liquid inlet hole. The aperture of the liquid outlet hole is smaller than the aperture of the liquid inlet hole.

8. The energy storage device according to claim 6, characterized in that: The convex column has a first end and a second end. The convex column is provided with a clamping flange at the first end. The injection body is provided with a first clamping groove and a second clamping groove at intervals along its axial direction.

9. The energy storage device according to claim 8, characterized in that: A first guide arc is provided on the side of the clamping flange facing the second end, and a second guide arc is provided on the edge of the slot of the first clamping slot. When the clamping flange is clamped in the first clamping slot, the first guide arc and the second guide arc abut against each other.

10. The energy storage device according to claim 8, characterized in that: A first clamping plane is provided on the side of the clamping flange away from the first guide arc, and the second clamping slot has a second clamping plane. When the clamping flange is clamped in the second clamping slot, the first clamping plane and the second clamping plane abut against each other.

11. An electrical device, characterized in that: An energy storage device comprising any one of claims 4 to 10.

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