Top cover assembly, energy storage device, energy storage module and electric equipment

Abstract

The utility model relates to a top cover assembly, an energy storage device, an energy storage module and electric equipment. The top cover assembly comprises a top cover, a flow collecting disc and a connecting piece, the connecting piece comprises a first folding piece, a second folding piece and a third folding piece, one end of the first folding piece is rotationally connected with the flow collecting disc through a first hinge, and the other end of the first folding piece is rotationally connected with the second folding piece through a second hinge; the other end of the second folding piece is connected with a third folding piece through a third hinge, and the third hinge and the third folding piece are both welded and fixed to the top cover. The top cover assembly can limit vibration of the battery cell in the height direction of the battery cell, so that the problem that a tab of the battery cell is pulled and torn due to the fact that the vibration amplitude of the battery cell is too large is solved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a top cover assembly, an energy storage device, an energy storage module and electrical equipment. Background Art

[0002] The two ends of the battery cell of a general energy storage battery are respectively provided with a positive electrode tab and a negative electrode tab. During installation, the positive electrode tab of the battery cell is welded to the shell through the positive current collector plate, and the negative electrode tab of the battery cell is welded to the negative terminal cover through the negative current collector plate. Due to process tolerances, after each battery cell is actually installed in the shell, there will be a certain deviation between the height of the battery cell and the height of the shell. In order to ensure the welding seal between the negative top cover and the open end of the shell, the negative current collector plate and the negative terminal cover are usually welded through an elastic connecting piece. When installing the negative terminal cover, the height difference between the battery cell and the shell is offset by stretching or compressing the elastic connecting piece.

[0003] However, during vibration testing of battery cells or during transportation, the battery cells will be subjected to vibration in all directions, and the elastic connecting piece on the negative side of the battery cells will expand and contract, thereby providing buffer protection for the negative electrode tabs. However, the positive collector plate on the positive side of the battery cells is rigidly connected to the positive top cover, and the expansion and contraction of the elastic connecting piece can easily lead to excessive amplitude of the battery cells in the axial direction, resulting in pulling between the positive electrode tabs and the positive collector plate of the battery cells, causing the positive electrode tabs to tear easily, affecting the battery's performance and service life. Summary of the invention

[0004] Based on this, it is necessary to provide a top cover assembly, an energy storage device, an energy storage module and an electrical equipment to prevent the tabs of the battery cell from being pulled and torn due to the vibration of the battery cell.

[0005] On one hand, the present application provides a top cover assembly for an energy storage device, comprising:

[0006] Collector plates; and

[0007] A connecting piece, the connecting piece includes a first folding piece, a second folding piece and a third folding piece, one end of the first folding piece is rotatably connected to the collecting plate through a first hinge, the other end of the first folding piece is rotatably connected to one end of the second folding piece through a second hinge, the other end of the second folding piece is connected to the third folding piece through a third hinge, and the third hinge and the third folding piece are both welded and fixed to the top cover.

[0008] The technical solution is further described below:

[0009] In one embodiment, the rotating axes of the first hinge, the second hinge and the third hinge are parallel to each other, a first bending angle is formed between the first folding piece and the collecting plate, a second bending angle is formed between the second folding piece and the first folding piece, and a third bending angle is formed between the third folding piece and the second folding piece; wherein the opening direction of the first bending angle is consistent with the opening direction of the third bending angle, and the opening direction of the first bending angle is opposite to the opening direction of the second bending angle.

[0010] In one of the embodiments, the collecting plate is provided with a protrusion, and the first folding piece is rotatably connected to the protrusion via the first hinge.

[0011] In one embodiment, a first avoidance groove is provided at one end of the first folding piece, a first extension portion extending in a direction away from the first avoidance groove is provided at the other end of the first folding piece, and at least a portion of the protrusion is embedded in the first avoidance groove and is rotatably connected to the groove wall of the first avoidance groove through the first hinge;

[0012] A second avoidance groove is provided at one end of the second folding piece, and a second extension portion extending in a direction away from the second avoidance groove is provided at the other end of the second folding piece, and at least a portion of the first extension portion is embedded in the second avoidance groove and is rotatably connected to the groove wall of the second avoidance groove through the second hinge;

[0013] A third avoidance groove is provided at one end of the third folding piece, and at least a portion of the second extension portion is embedded in the third avoidance groove and connected to the groove wall of the third avoidance groove through the third hinge.

[0014] In one embodiment, the first hinge includes a first rotating shaft, which is rotatably connected to the collecting plate and to the first folding piece; the second hinge includes a second rotating shaft, which is rotatably connected to the first folding piece and to the second folding piece; the third hinge includes a third rotating shaft, which is connected to the second folding piece and to the third folding piece.

[0015] In one embodiment, the first rotating shaft is threadedly connected to the collecting plate and to the first folding piece; the second rotating shaft is threadedly connected to the first folding piece and to the second folding piece; the third rotating shaft is threadedly connected to the second folding piece and to the third folding piece.

[0016] In one of the embodiments, an identification groove is provided on the outer surface of the top cover at a position corresponding to the third hinge.

[0017] On the other hand, the present application also provides an energy storage device, including a shell, a battery cell, a top cover and the above-mentioned top cover assembly, wherein one side of the shell has an opening, the battery cell is arranged in the shell, one side of the battery cell is provided with a first pole ear, the first pole ear is connected to the collecting plate, and the top cover is connected to one side of the shell opening and covers the opening.

[0018] In one embodiment, the energy storage device further includes a pole, a current collector, a first insulating member and a second insulating member, a second pole ear is provided at one end of the battery cell away from the first pole ear, the current collector is connected to the second pole ear, a shell cover is provided at one end of the shell away from the top cover, the shell cover has a mounting hole, the pole is arranged in the mounting hole and connected to the current collector, the first insulating member is arranged between the pole and the shell cover, and the second insulating member is arranged between the shell cover and the current collector.

[0019] The present application also provides an energy storage module, comprising the above-mentioned energy storage device.

[0020] The present application also provides an electrical device, comprising the energy storage device as described above, wherein the energy storage device is used for supplying power.

[0021] In the above-mentioned top cover assembly, energy storage device, energy storage module and electrical equipment, the first pole ear of the battery cell is connected through the collecting plate, and the top cover is connected through the third folding piece. Since one end of the first folding piece is rotatably connected to the collecting plate through the first hinge, the other end of the first folding piece is rotatably connected to the second folding piece through the second hinge, and the other end of the second folding piece is connected to the third folding piece through the third hinge, the size of the connecting piece in the height direction of the battery cell can be adjusted by rotating the first folding piece and the second folding piece. When the battery cell is installed in the shell, the connecting piece can fill the height difference from the top of the battery cell to the open end of the shell to ensure that the top cover can be accurately sealed and welded to the open end of the shell, thereby eliminating the need to set an elastic connecting piece on the other side of the battery cell. At this time, the other side of the battery cell can be connected to the shell cover of the shell using a rigid structure. Furthermore, after the top cover is welded and fixed to the open end of the shell, the third hinge is welded and fixed to the top cover by methods such as penetration welding to lock the third hinge. After the third hinge is locked, the relative position of the second folding piece is fixed. At this time, although the first hinge and the second hinge are not fixed, the movement of the battery cell in the radial direction has been restricted by the shell, so that the left and right swing of the first folding piece around the second hinge is also restricted. At this time, the connecting part forms a rigid structure, which can rigidly support the battery cell and limit the vibration of the battery cell along its height direction, thereby avoiding the problem of the battery cell's pole ear being pulled and torn due to the excessive vibration amplitude of the battery cell in the height direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only as examples in the drawings and are not necessarily drawn according to the true scale.

[0025] Figure 1 Schematic diagram of the structure of a top cover assembly according to an embodiment.

[0026] Figure 2 for Figure 1 A top view of the top cover assembly is shown in FIG.

[0027] Figure 3 for Figure 2 A cross-sectional view of the top cover assembly shown in FIG. 1 along section DD.

[0028] Figure 4 The figure is a schematic diagram of the structure of a connecting piece according to an implementation.

[0029] Figure 5 Schematic diagram of the structure of an energy storage device according to an embodiment.

[0030] Figure 6 for Figure 5 A cross-sectional view of the energy storage device shown in FIG. 1 along the AA section.

[0031] Figure 7 for Figure 6 A partial enlarged view of part B of the energy storage device shown in FIG.

[0032] Figure 8 for Figure 6 A partial enlarged view of the energy storage device at part C shown in FIG.

[0033] Description of reference numerals:

[0034] 11. current collecting plate; 111. raised portion; 12. connecting member; 121. first folding piece; 1211. first avoidance groove; 1212. first extension portion; 122. second folding piece; 1221. second avoidance groove; 1222. second extension portion; 123. third folding piece; 1231. third avoidance groove; 124. first hinge; 125. second hinge; 126. third hinge; 20. battery cell; 30. shell; 31. top cover; 32. shell cover; 40. current collecting member; 41. boss portion; 50. pole; 61. first insulating member; 62. second insulating member. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] An embodiment of the present application provides a top cover assembly, which is applied to an energy storage device and is used to connect a first pole tab of a battery cell 20. For example, the first pole tab may be a positive pole tab of the battery cell 20 of the energy storage device. Figure 7 The top cover assembly of one embodiment includes a top cover 31, a current collecting plate 11 and a connecting member 12, wherein the current collecting plate 11 is used to connect with the first pole ear of the battery cell 20. The top cover 31 is used to connect to one side of the housing opening and cover the opening. Figure 7 The connecting member 12 includes a first folding piece 121, a second folding piece 122 and a third folding piece 123. One end of the first folding piece 121 is rotatably connected to the current collecting plate 11 through a first hinge 124, the other end of the first folding piece 121 is rotatably connected to the second folding piece 122 through a second hinge 125, and the other end of the second folding piece 122 is connected to the third folding piece 123 through a third hinge 126. The third hinge 126 and the third folding piece 123 are both welded and fixed to the current collecting plate. Further, in combination with Figure 2 as well as Figure 3 A first bending angle α is formed between the first folding piece 121 and the collecting plate 11, a second bending angle β is formed between the second folding piece 122 and the first folding piece 121, and a third bending angle θ is formed between the third folding piece 123 and the second folding piece 122; the third folding piece 123 and the third hinge 126 are welded and fixed to the top cover 31, that is, the third bending angle θ is fixed.

[0042] When the above-mentioned top cover assembly is used in an energy storage device, the first pole ear of the battery cell 20 can be connected through the current collecting plate 11, and the top cover 31 can be connected through the third folding piece 123. Since one end of the first folding piece 121 is rotatably connected to the current collecting plate 11 through the first hinge 124, the other end of the first folding piece 121 is rotatably connected to the second folding piece 122 through the second hinge 125, and the other end of the second folding piece 122 is rotatably connected to the third folding piece 123 through the third hinge 126, the size of the connecting member 12 in the height direction of the battery cell 20 can be adjusted by rotating the first folding piece 121 and the second folding piece 122. When the battery cell 20 is installed in the shell 30, the connecting member 12 can adaptively fill the height difference from the top of the battery cell 20 to the open end of the shell 30 to ensure that the top cover 31 can be accurately sealed and welded to the open end of the shell 30, thereby eliminating the need to set an elastic connecting piece on the other side of the battery cell 20. At this time, the other side of the battery cell 20 can be connected to the shell cover 32 of the shell 30 using a rigid structure. Furthermore, after the top cover 31 is welded and fixed to the open end of the shell 30, the third hinge 126 is welded and fixed to the top cover 31 by, for example, penetration welding, so as to lock the third hinge 126, thereby fixing the third bending angle θ. After the third bending angle θ is fixed, the relative position of the second folding piece 122 is fixed. At this time, although the first hinge 124 and the second hinge 125 are not fixed, the movement of the battery cell 20 in the radial direction has been restricted by the shell 30, so that the left and right swing of the first folding piece 121 around the second hinge 125 is also restricted, that is, the first bending angle α and the second bending angle β are also fixed. At this time, the connecting member 12 forms a rigid structure, which can rigidly support the battery cell 20 and limit the vibration of the battery cell 20 along its height direction, thereby avoiding the problem of the pole ear of the battery cell 20 being pulled and torn due to the excessive vibration amplitude of the battery cell 20 in the height direction.

[0043] See also Figure 3In one embodiment, the rotating shafts of the first hinge 124, the second hinge 125 and the third hinge 126 are parallel to each other. The opening direction of the first bending angle α is consistent with the opening direction of the third bending angle θ, and the opening direction of the first bending angle α is opposite to the opening direction of the second bending angle β, that is, the cross-section of the connecting member 12 in the height direction of the battery cell 20 is a "∑"-shaped structure, so that the rotation of the first folding piece 121 and the second folding piece 122 is smoother, and after the battery cell 20 is installed in the housing 30, the height of the connecting member 12 can be adjusted more smoothly, so that the connecting member 12 can better match the height difference from the collecting plate 11 to the top cover 31. At the same time, after the third hinge 126 is fixed to the top cover 31 to fix the third bending angle θ, the first bending angle α and the second bending angle β are also fixed to ensure that the connecting piece forms a rigid structure to limit the vibration of the battery cell 20 in the height direction.

[0044] See also Figure 1 The current collecting disk 11 is provided with a protrusion 111, and the first folding piece 121 is rotatably connected to the protrusion 111 through a first hinge 124. Specifically, the current collecting disk 11 is in the shape of a thin disk as a whole. By providing the protrusion 111 on the current collecting disk 11, it is easier for the first folding piece 121 to be rotatably connected to the current collecting disk 11 through the first hinge 124. Further, the current collecting disk 11 is an annular structure, and the protrusion 111 is an annular protrusion, which is provided along the inner circle edge of the current collecting disk 11.

[0045] See also Figure 1 as well as Figure 4 Optionally, in one embodiment, a first avoidance groove 1211 is provided at one end of the first folding piece 121, and a first extension portion 1212 extending in a direction away from the first avoidance groove 1211 is provided at the other end of the first folding piece 121. At least a portion of the protrusion 111 is embedded in the first avoidance groove 1211 and is rotatably connected to the groove wall of the first avoidance groove 1211 through the first hinge 124. In this way, the connection stability between the protrusion 111 and the first folding piece 121 is improved, thereby improving the support force for the battery cell 20. At the same time, the contact area between the protrusion 111 and the first folding piece 121 is increased, thereby increasing the flow capacity between the current collecting plate 11 and the first folding piece 121. In addition, the problem of interference between the first folding piece 121 and the protrusion 111 when the first folding piece 121 rotates around the first hinge 124 can be avoided, and the rotatable range of the first folding piece 121 is increased.

[0046] Continue to see Figure 4Furthermore, a second avoidance groove 1221 is provided at one end of the second folding piece 122, and a second extension portion 1222 extending in a direction away from the second avoidance groove 1221 is provided at the other end of the second folding piece 122, and at least a portion of the first extension portion 1212 is embedded in the second avoidance groove 1221 and is rotatably connected to the groove wall of the second avoidance groove 1221 through the second hinge 125. In this way, the connection stability between the first folding piece 121 and the second folding piece 122 is improved, thereby improving the supporting force for the battery cell 20. At the same time, the contact area between the first folding piece 121 and the second folding piece 122 is increased, thereby increasing the flow capacity between the first folding piece 121 and the second folding piece 122. In addition, the problem of interference between the second folding piece 122 and the first folding piece 121 when the second folding piece 122 and the first folding edge rotate relative to each other around the second hinge 125 is avoided, thereby increasing the rotatable range of the second folding piece 122 and the first folding piece 121.

[0047] A third avoidance groove 1231 is provided at one end of the third folding piece 123, and at least a portion of the second extension portion 1222 is embedded in the third avoidance groove 1231 and is rotatably connected to the groove wall of the third avoidance groove 1231 through the third hinge 126. In this way, the connection stability between the second folding piece 122 and the third folding piece 123 is improved, thereby improving the support force for the battery cell 20. At the same time, the contact area between the second folding piece 122 and the third folding piece 123 is increased, thereby increasing the flow capacity between the second folding piece 122 and the third folding piece 123. In addition, the problem of interference between the second folding piece 122 and the third folding piece 123 when the second folding piece 122 rotates around the third hinge 126 can be avoided, and the rotatable range of the second folding piece 122 is further increased.

[0048] Optionally, in one embodiment, the first hinge 124 includes a first rotating shaft, which is rotatably connected to the collecting plate 11 and to the first folding plate 121. Specifically, the first rotating shaft is passed through the raised portion 111 of the rotating plate, and both ends of the first rotating shaft pass through the raised portion 111 and are respectively rotatably connected to two opposite groove walls of the first avoidance groove 1211, thereby realizing the rotation of the first folding plate 121 relative to the collecting plate 11.

[0049] The second hinge 125 includes a second rotating shaft, which is rotationally connected to the first folding piece 121 and rotationally connected to the second folding piece 122; specifically, the second rotating shaft is passed through the first extension portion 1212, and both ends of the second rotating shaft pass through the first extension portion 1212 and are respectively rotationally connected to the two opposite groove walls of the second avoidance groove 1221, thereby realizing the relative rotation of the second folding piece 122 and the first folding piece 121.

[0050] The third hinge 126 includes a third rotating shaft, which is connected to the second folding piece 122 and to the third folding piece 123; specifically, the third rotating shaft is passed through the second extension portion 1222, and both ends of the third rotating shaft pass through the second extension portion 1222 and are respectively connected to the two opposite groove walls of the third avoidance groove 1231, thereby realizing the rotation of the second folding piece 122 relative to the third folding piece 123.

[0051] Furthermore, the first rotating shaft, the second rotating shaft and the third rotating shaft are parallel to each other, so as to ensure the smooth rotation of the first folding piece 121 and the second folding piece 122, and to ensure that after the first folding piece 121 and the second folding piece 122 rotate, the size of the connecting member 12 in the height direction of the battery cell 20 can be adjusted to adapt to the height difference between the battery cell 20 and the top cover 31. It can be understood that in other embodiments, the first hinge 124, the second hinge 125 and the third hinge 126 can also be hinges or ball hinges.

[0052] Optionally, in one embodiment, the first rotating shaft is threadedly connected to the current collecting plate 11 and is threadedly connected to the first folding piece 121; the second rotating shaft is threadedly connected to the first folding piece 121 and is threadedly connected to the second folding piece 122; the third rotating shaft is threadedly connected to the second folding piece 122 and is threadedly connected to the third folding piece 123. In this way, after the top cover 31 is welded and fixed to the housing 30, and the third rotating shaft is welded and fixed to the top cover 31, the first bending angle α, the second bending angle β and the third bending angle θ can be further fixed by the limiting effect of the thread, thereby strengthening the structural strength of the connector 12 and strengthening the supporting effect on the battery cell 20.

[0053] Optionally, in one embodiment, a marking groove (not shown) is provided on the outer surface of the top cover 31 at a position corresponding to the third hinge 126. In this way, after the top cover 31 is welded and fixed to the open end of the housing 30, penetration welding is performed at the marking groove on the outer surface of the top cover 31, so that the third hinge 126 can be welded and fixed to the top cover 31. The provision of the marking groove facilitates penetration welding on the outer surface of the top cover 31 to align the third hinge 126, and the marking groove can also focus light, thereby improving the energy absorption rate of the top cover 31 to the welding laser.

[0054] An embodiment of the present application also provides an energy storage device, which can be a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery. Figure 5 as well as Figure 6 The energy storage device of one embodiment includes a housing 30, a battery cell 20, and a top cover assembly of any of the above embodiments, wherein one side of the housing 30 has an opening, the battery cell 20 is disposed in the housing 30, one side of the battery cell 20 is provided with a first pole ear, the first pole ear is connected to the current collecting plate 11, and the top cover 31 is connected to one side of the opening of the housing 30 and covers the opening. Exemplarily, the first pole ear is the positive pole ear of the battery cell 20.

[0055] In the above energy storage device, the size of the connector 12 in the height direction of the battery cell 20 can be adjusted by rotating the first folding piece 121 and the second folding piece 122. In this way, when the battery cell 20 is installed in the shell 30, the connector 12 can fill the height difference from the top of the battery cell 20 to the open end of the shell 30 to ensure that the top cover 31 can be accurately sealed and welded to the open end of the shell 30, thereby eliminating the need to set an elastic connecting piece on the other side of the battery cell 20. At this time, the other side of the battery cell 20 can be connected to the shell cover 32 of the shell 30 using a rigid structure. Furthermore, after the top cover 31 is welded and fixed to the open end of the shell 30, the third hinge 126 is fixed to the top cover 31 by, for example, penetration welding, to lock the third hinge 126. After the third hinge 126 is locked, the relative position of the second folding piece 122 is fixed. At this time, although the first hinge 124 and the second hinge 125 are not fixed, the movement of the battery cell 20 in the radial direction has been restricted by the shell 30, so that the left and right swing of the first folding piece 121 around the second hinge 125 is also restricted, that is, the first bending angle α and the second bending angle β are also fixed. At this time, the connecting part forms a rigid structure, which can rigidly support the battery cell 20 and limit the vibration of the battery cell 20 along its height direction, thereby avoiding the problem of the pole ear of the battery cell 20 being pulled and torn due to the excessive vibration amplitude of the battery cell 20 in the height direction.

[0056] See also Figure 8 Optionally, in one embodiment, the energy storage device further includes a pole 50, a current collector 40, a first insulating member 61 and a second insulating member 62. The end of the battery cell 20 away from the first pole ear is provided with a second pole ear. Exemplarily, the second pole ear can be a negative pole ear of the battery cell 20. The current collector 40 is connected to the second pole ear, and the end of the shell 30 away from the top cover 31 is provided with a shell cover 32. The shell cover 32 is provided with a mounting hole. The pole 50 is arranged in the mounting hole and connected to the current collector 40. Exemplarily, the pole 50 is provided with a central hole, and the current collector 40 is provided with a boss portion 41 protruding toward the side away from the battery cell 20. At least part of the boss portion 41 is embedded in the central hole of the pole 50 along the height direction of the battery cell 20 and fixed. In this way, the negative pole side of the battery cell 20 is also a rigid structure, and combined with the rigid top cover assembly on the positive pole side of the battery cell 20, both sides of the battery cell 20 are rigid structures, further limiting the vibration of the battery cell 20 in the height direction, thereby further preventing the first pole ear and the second pole ear of the battery cell 20 from being pulled and torn due to the vibration of the battery cell 20.

[0057] Further, the first insulating member 61 is disposed between the pole 50 and the shell cover 32 to isolate the pole 50 from the shell cover 32. Similarly, the second insulating member 62 is disposed between the shell cover 32 and the current collector 40 to isolate the shell cover 32 from the current collector 40. Specifically, since the shell 30 is electrically connected to the first pole ear of the battery cell 20 through the top cover assembly, the pole 50 is isolated from the shell cover 32 by the first insulating member 61 and the shell cover 32 is isolated from the current collector 40 by the second insulating member 62, thereby preventing a short circuit from occurring.

[0058] An embodiment of the present application also provides an energy storage module, and the energy storage module of one embodiment includes the energy storage device of any of the above embodiments. Specifically, the energy storage module may include one or more energy storage devices. The energy storage module may also include a box for encapsulating one or more energy storage devices, and the box may prevent liquid or other foreign matter from affecting the charging or discharging of the energy storage device.

[0059] One embodiment of the present application also provides an electric device, and the electric device of one embodiment includes the energy storage device of any of the above embodiments, and the energy storage device is used to supply power. Furthermore, the electric device may also include an electric main body, and the electric main body is electrically connected to the energy storage device. Specifically, the electric main body can be in various forms, for example, a mobile phone, a portable device, a laptop computer, a battery car, an electric car, a ship, a spacecraft, an electric toy, an electric tool, etc., which are not limited here.

[0060] 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.

[0061] 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 top cover assembly for an energy storage device, characterized in that: include: Top cover; Collector plate; as well as A connecting piece, the connecting piece includes a first folding piece, a second folding piece and a third folding piece, one end of the first folding piece is rotatably connected to the collecting plate through a first hinge, the other end of the first folding piece is rotatably connected to one end of the second folding piece through a second hinge, the other end of the second folding piece is connected to the third folding piece through a third hinge, and the third hinge and the third folding piece are both welded and fixed to the top cover.

2. The top cover assembly according to claim 1, characterized in that: The rotating axes of the first hinge, the second hinge and the third hinge are parallel to each other, a first bending angle is formed between the first folding piece and the collecting plate, a second bending angle is formed between the second folding piece and the first folding piece, and a third bending angle is formed between the third folding piece and the second folding piece; wherein, an opening direction of the first bending angle is consistent with an opening direction of the third bending angle, and an opening direction of the first bending angle is opposite to an opening direction of the second bending angle.

3. The top cover assembly according to claim 1, characterized in that: The current collecting plate is provided with a protrusion, and the first folding piece is rotatably connected to the protrusion through the first hinge.

4. The top cover assembly according to claim 3, characterized in that: A first avoidance groove is provided at one end of the first folding piece, a first extension portion extending in a direction away from the first avoidance groove is provided at the other end of the first folding piece, and at least a portion of the protrusion is embedded in the first avoidance groove and is rotatably connected to the groove wall of the first avoidance groove through the first hinge; A second avoidance groove is provided at one end of the second folding piece, and a second extension portion extending in a direction away from the second avoidance groove is provided at the other end of the second folding piece, and at least a portion of the first extension portion is embedded in the second avoidance groove and is rotatably connected to the groove wall of the second avoidance groove through the second hinge; A third avoidance groove is provided at one end of the third folding piece, and at least a portion of the second extension portion is embedded in the third avoidance groove and is rotatably connected to the groove wall of the third avoidance groove through the third hinge.

5. The top cover assembly according to claim 1, characterized in that: The first hinge includes a first rotating shaft, which is rotatably connected to the collecting plate and the first folding piece; the second hinge includes a second rotating shaft, which is rotatably connected to the first folding piece and the second folding piece; the third hinge includes a third rotating shaft, which is rotatably connected to the second folding piece and the third folding piece.

6. The top cover assembly according to claim 5, characterized in that: The first rotating shaft is threadedly connected to the collecting plate and to the first folding piece; the second rotating shaft is threadedly connected to the first folding piece and to the second folding piece; the third rotating shaft is threadedly connected to the second folding piece and to the third folding piece.

7. The top cover assembly according to any one of claims 1 to 6, characterized in that: An identification groove is provided on the outer surface of the top cover at a position corresponding to the third hinge.

8. An energy storage device, characterized in that: It comprises a shell, a battery cell and a top cover assembly according to any one of claims 1 to 7, wherein one side of the shell has an opening, the battery cell is arranged in the shell, one side of the battery cell is provided with a first pole ear, the first pole ear is connected to the collecting plate, and the top cover is connected to one side of the shell opening and covers the opening.

9. The energy storage device according to claim 8, characterized in that: The energy storage device also includes a pole, a current collector, a first insulating member and a second insulating member. The second pole ear is provided at the end of the battery cell away from the first pole ear, and the current collector is connected to the second pole ear. A shell cover is provided at the end of the shell away from the top cover, and the shell cover has a mounting hole. The pole is arranged in the mounting hole and connected to the current collector. The first insulating member is arranged between the pole and the shell cover, and the second insulating member is arranged between the shell cover and the current collector.

10. An energy storage module, characterized in that: Comprising the energy storage device as claimed in claim 8 or 9.

11. An electrical device, characterized in that: The invention comprises the energy storage device as claimed in claim 10, wherein the energy storage device is used for supplying electricity.

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