Energy storage device and energy storage system

Abstract

The utility model discloses an energy storage device and an energy storage system. The energy storage device comprises a shell, a battery cell arranged in the shell, a pole provided with a mounting groove, and a current collector. The current collector comprises a connecting sheet body configured to be electrically connected with the battery cell and a protruding part arranged on the connecting sheet body in a protruding mode in the first direction, the protruding part is configured to partially stretch into the mounting groove and abut against the wall face of the mounting groove in the first direction, and the protruding part can move in the mounting groove in the second direction; one end of the first elastic piece is connected to the protruding part, the other end of the first elastic piece is connected to the wall face of the mounting groove, and the first elastic piece is used for enabling the protruding part to abut against the wall face of the mounting groove in the first direction. Wherein the first direction is the axial direction of the pole, and the second direction is perpendicular to the first direction. According to the energy storage device, the integrity of the tabs can be kept when the battery cell is vibrated or impacted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to an energy storage device and an energy storage system. BACKGROUND

[0002] The energy storage device (for example, a lithium battery) usually comprises a cell, a pole and a current collector. The cell has a tab, and the current collector is welded to the pole and the tab of the cell to realize current conduction of the energy storage device.

[0003] However, when the lithium battery is subjected to vibration test or in the process of transportation, the cell will be subjected to vibration or impact in different directions. When the winding core moves, the winding core and the connecting piece will pull the tab, which may cause the tab to tear or even completely break, resulting in failure of the cell. UTILITY MODEL CONTENT

[0004] The energy storage device and the energy storage system disclosed by the embodiments of the present application can maintain the integrity of the tab when the cell is subjected to vibration or impact.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the present application discloses an energy storage device, comprising:

[0006] a housing, a cell arranged in the housing, a pole provided with a mounting groove, and a current collector comprising a connecting piece body configured to be electrically connected to the cell, a protruding portion protruding in a first direction and arranged in the connecting piece body, the protruding portion being configured to partially extend into the mounting groove and abut against a wall surface of the mounting groove in the first direction, and the protruding portion being movable in a second direction in the mounting groove to adjust the position of the protruding portion relative to the pole in the second direction, and a first elastic member having one end connected to the protruding portion and the other end connected to the wall surface of the mounting groove, the first elastic member being configured to keep the protruding portion abutting against the wall surface of the mounting groove in the first direction, wherein the first direction is the axial direction of the pole, and the second direction is perpendicular to the first direction.

[0007] In the energy storage device provided by the present application, the protruding portion of the current collector partially extends into the mounting groove on the pole, and the size of the mounting groove in the second direction perpendicular to the extension direction of the protruding portion is greater than that of the protruding portion, so that the protruding portion can move relative to the pole in the second direction. In this way, when the energy storage device is subjected to vibration or impact and the winding core of the energy storage device moves, the protruding portion can move synchronously with the winding core under the driving of the tab, so as to avoid pulling the tab, thereby preventing the tab from tearing or even completely breaking, and maintaining the integrity of the tab.

[0008] As an optional implementation, the mounting groove comprises a first groove body and a second groove body, the first groove body and the second groove body are sequentially arranged and communicated along the first direction, and the size of the second groove body along the second direction is greater than the size of the first groove body along the second direction; the protruding part comprises a columnar part and an abutting part, the columnar part is protrudingly arranged on the connecting sheet body along the first direction, and the columnar part at least partially extends into the first groove body, the size of the main body part along the second direction is smaller than the size of the second groove body along the second direction; the abutting part is arranged at one end of the columnar part away from the connecting sheet body, the size of the abutting part along the second direction is greater than the size of the first groove body along the second direction, the abutting part is located in the second groove body, and the abutting part is movable in the second groove body along the second direction, one end of the first elastic member is connected to the abutting part along the first direction, and the other end of the first elastic member is connected to the wall surface of the second groove body.

[0009] The first groove body and the second groove body are communicated along the first direction, and the second groove body is located outside the first groove body, so that the wall surface of the first groove body and the wall surface of the second groove body form a step at the connection, the abutting part of the protruding part is embedded in the second groove body, and the size of the main body part along the second direction is smaller than the size of the second groove body along the second direction. In this way, at least part of the surface of the abutting part can abut against part of the wall surface of the second groove body along the first direction, and the step formed by the wall surface of the first groove body and the wall surface of the second groove body can limit the abutting part, so that the abutting part can be prevented from being separated from the mounting groove, and the effective connection between the protruding part and the pole can be ensured.

[0010] As an optional implementation, the abutting part has a first surface and a second surface, the first surface is a surface arranged on the columnar part, and the second surface is arranged opposite to the first surface; the second groove body has a bottom surface and a top surface arranged opposite along the first direction, the first elastic member is connected between the first surface and the bottom surface of the second groove body, and / or the first elastic member is connected between the second surface and the top surface of the second groove body.

[0011] When the first elastic member is arranged between the first surface of the abutting part and the bottom surface of the second groove body, the second surface of the abutting part abuts against the top surface of the second groove body, and when the second elastic member is arranged between the second surface of the abutting part and the top surface of the second groove body, the first surface of the abutting part abuts against the bottom surface of the second groove body, either of the above-mentioned arrangements can realize the connection between the abutting part and the wall surface of the mounting groove, and further realize the flow between the current collector and the pole. In this way, the arrangement position of the first elastic member can be selected according to actual conditions, and the flexibility of the assembly of the energy storage device can be improved.

[0012] As an optional implementation, when the first elastic member is connected between the second face and the top face of the second groove body, the first face is configured as a first inclined face, the bottom face of the second groove body is configured as a second inclined face, and the first inclined face is configured to be connected with the second inclined face.

[0013] The first face of the abutting portion is configured as an inclined face, and the bottom face of the second groove body is configured as an inclined face connected with the first face. In this way, compared with the design in which the first face and the bottom face of the second groove body are configured as planes, when the size in the second direction is the same, the first face and the bottom face of the second groove body are configured as inclined faces, a larger flow area can be formed, thereby facilitating the improvement of the flow efficiency.

[0014] As an optional implementation, the first inclined face and the second inclined face are inclined relative to the second direction, and the inclination angle of the first inclined face and the second inclined face relative to the second direction is 5°-45°.

[0015] By reasonably setting the inclination angle of the first inclined face and the second inclined face, the manufacturing difficulty of the pole and the current collector can be reduced, and a larger flow area can be formed between the pole and the current collector. When the inclination angle is 5°-20°, the space between the opposite wall faces of the second groove body is larger, and the abutting portion has a larger movement space, which can better provide a buffer for the tab. When the inclination angle is 20°-35°, the design requirements of large flow area and large movement space can be considered. When the inclination angle is 35°-45°, a larger flow area can be achieved, and the flow efficiency can be effectively improved.

[0016] As an optional implementation, when the first elastic member is connected between the first face and the bottom face of the second groove body, the first face is configured as a first plane, the top face of the second groove body is configured as a second plane, and the abutting portion is configured to abut against the top face of the second groove body under the action of the first elastic member.

[0017] The first face and the bottom face of the second groove body are configured as planes, which can effectively reduce the manufacturing difficulty of the pole and the current collector, and the first face and the bottom face of the second groove body can also move relative to each other in the second direction, further increasing the degree of freedom of the current collector relative to the pole. At the same time, the first elastic member is arranged between the first face and the bottom face of the second groove body, the second face is driven by the first elastic member to abut against the top face of the first groove body, the first face and the top face of the first groove body abut against each other to form a flow, which obviously increases the area of the flow face, and helps to improve the flow efficiency.

[0018] As an optional implementation, the pole column is provided with a side opening, the side opening is communicated with the mounting groove along a third direction, and the protruding part can be inserted into the mounting groove along the third direction through the side opening; wherein the third direction intersects with the first direction and the second direction.

[0019] By providing the pole column with a side opening communicated with the mounting groove along a third direction, the protruding part can be inserted into the mounting groove along the third direction through the side opening, the third direction intersects with the first direction and the second direction, and the protruding part also has a space for movement relative to the pole column in the third direction, which can further prevent the tab from being broken when the energy storage device is subjected to vibration or impact.

[0020] As an optional implementation, in the second direction, the distance between the protruding part and the wall surface of the mounting groove in the second direction is 1mm-3mm.

[0021] In the second direction, the distance between the protruding part and the wall surface of the mounting groove in the second direction is 1mm-3mm. When the distance between the protruding part and the wall surface of the mounting groove is 1mm, the cooperation between the current collector and the pole column can be more compact, and the volume of the energy storage device can be reduced. When the distance between the protruding part and the wall surface of the mounting groove is 1mm-2mm, the current collector has a certain movement space relative to the pole column, and the current collector and the pole column can be relatively compact. When the distance between the protruding part and the wall surface of the mounting groove is 2mm-3mm, the current collector has a larger movement space relative to the pole column, which effectively prevents the tab from being broken when the energy storage device is subjected to vibration or impact.

[0022] As an optional implementation, the energy storage device further comprises a plurality of second elastic members, one end of the elastic member is connected to the protruding part in the second direction, the other end of the second elastic member is connected to the wall surface of the mounting groove, and the plurality of second elastic members are arranged at intervals.

[0023] The energy storage device further comprises a plurality of second elastic members, the plurality of second elastic members are arranged at intervals between the protruding part and the wall surface of the mounting groove, one end of the plurality of second elastic members is connected to the protruding part in the second direction, and the other end is connected to the wall surface of the mounting groove. In this way, the design requirement of the movement of the protruding part relative to the pole column can be met, and the second elastic member can also be used to achieve buffering to avoid the protruding part from moving violently relative to the pole column.

[0024] In a second aspect, the application discloses an energy storage system, which comprises the energy storage device of any one of the above, and the energy storage device is used for power supply.

[0025] Compared with the prior art, the application has the following beneficial effects:

[0026] In the energy storage device provided by the present application, the protruding part of the current collector extends into the mounting groove formed by the pole of the energy storage device, and the size of the mounting groove in the second direction perpendicular to the extending direction of the protruding part is greater than that of the protruding part, so that the protruding part can move relative to the pole in the second direction. In this way, when the energy storage device is subjected to vibration or impact and the winding core of the energy storage device is displaced, the protruding part can move synchronously with the winding core under the driving of the tab, so that the tab can be prevented from being pulled and torn or even completely broken, thereby maintaining the integrity of the tab. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a schematic diagram of the three-dimensional structure of the energy storage device provided by the present application;

[0029] Figure 2 is a schematic diagram of the front view of the energy storage device provided by the present application;

[0030] Figure 3 is Figure 2 the cross-sectional view of the energy storage device shown in FIG. 1 along the A-A' direction;

[0031] Figure 4 is Figure 3 the enlarged schematic diagram of the A area in FIG. 1;

[0032] Figure 5 is Figure 2 the schematic diagram of the three-dimensional structure of the tab, the pole and the current collector of the energy storage device shown in FIG. 1;

[0033] Figure 6 is the structure explosion schematic diagram of the tab, the pole and the current collector when the first elastic member is a spring;

[0034] Figure 7 is the structure explosion schematic diagram of the tab, the pole and the current collector when the first elastic member is a spring;

[0035] Figure 8 is Figure 7 the schematic diagram of the three-dimensional structure of the first connecting part shown in FIG. 1;

[0036] Figure 9 is Figure 8 the schematic diagram of the front view of the first connecting part shown in FIG. 1;

[0037] Figure 10 is a perspective view of a current collector with a square-shaped connecting tab in an embodiment of the present application;

[0038] Figure 11 is a structural view of a current collector with an H-shaped connecting tab body in an embodiment of the present application;

[0039] Figure 12 is a structural view of a current collector with a kidney-shaped connecting tab body in an embodiment of the present application;

[0040] Figure 13 is a structural view of a current collector with an oval-shaped connecting tab body in an embodiment of the present application;

[0041] Figure 14 is a structural view of a current collector with a strip-shaped connecting tab body in an embodiment of the present application;

[0042] Figure 15 is a structural view of a current collector with a Z-shaped connecting tab body in an embodiment of the present application;

[0043] Figure 16 is a structural view of a current collector with an hourglass-shaped connecting tab body in an embodiment of the present application;

[0044] Figure 17 is a front view of a current collector as shown in Figure 10

[0045] Figure 18 is an assembly view of a current collector as shown in Figure 9 Figure 16 is a perspective view of another first connecting part in an embodiment of the present application;

[0046] Figure 19 is a front view of a first connecting part as shown in

[0047] Figure 20 Figure 19

[0048] Figure 21 is a perspective view of another current collector in an embodiment of the present application;

[0049] Figure 22 is a front view of a current collector as shown in Figure 21

[0050] Figure 23 Figure 20 Figure 22

[0051] Figure 24 ​​​​​​​​is an assembly schematic view of the pole and the current collector, the second elastic member in the embodiment of the present application;

[0052] Figure 25 is a structural schematic view of a kind of energy storage system in the embodiment of the present application;

[0053] Figure 26 is a structural schematic view of another kind of energy storage system in the embodiment of the present application.

[0054] Reference signs

[0055] Energy storage device 100;

[0056] Shell 110, top cover 111;

[0057] Battery cell 120, tab 121;

[0058] Pole 130, mounting groove 131, second side opening 131a, first slot 131b, second slot 131c, first connecting part 132, connecting plate part 132a, side plate part 132b, protrusion 132c, second connecting part 133;

[0059] Current collector 140, connecting sheet 141, protruding part 142, column part 142a, abutting part 142b, first surface 142c, second surface 142d;

[0060] First elastic member 150;

[0061] Second elastic member 160;

[0062] First direction P1, second direction P2, third direction P3. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0064] In the present application, the terms "upper", "top", "inner", "outer", "middle" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components must have a particular orientation, or be constructed and operated in a particular orientation.

[0065] And, the above-mentioned partial terms, in addition to can be used to express the orientation or positional relationship, possibly also be used to express other meanings, for example, the term "upper" in some cases can also be used to express a certain dependent relationship or connection relationship. For those of ordinary skill in the art, the specific meaning of these terms in this application can be understood according to the specific circumstances.

[0066] In addition, the term "set" should be broadly understood. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in this application can be understood according to the specific circumstances.

[0067] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific type and structure may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated device, element or component. Unless otherwise stated, the meaning of "multiple" is two or more.

[0068] Generally, a lithium ion battery includes a pole, a current collector, and a roll core / stacked core structure, etc. The roll core includes a positive electrode sheet, a separator, and a negative electrode sheet wound to form, and the positive and negative electrode sheets are provided with a tab and connected to the current collector through the tab. In order to increase the capacity of the single lithium ion battery, the size of the core needs to be increased, which significantly increases the overcurrent resistance of the corresponding current collector and tab, and these overcurrent structural members have a significant temperature rise during use. In addition, the increase in the size of the core also leads to an increase in the weight of the core, which increases its inertia. When the lithium ion battery is in the process of vibration test or transportation, the vibration or impact received by the roll core will cause the roll core to move, further pulling the tab of the roll core. Since the tab is relatively fragile, it may appear to be dark, torn or completely broken.

[0069] The inventor attempts to set a spring between the pole and the current collector, and the contraction direction of the spring coincides with the axial direction of the pole, so that the current collector can move axially relative to the pole. In this way, when the roll core is displaced and pulls the tab, the current collector can move synchronously with the tab, reducing the pulling of the tab and thereby avoiding damage to the tab. However, in this design, the spring has a single buffering direction, and can only have good buffering effect on vibration or impact in a certain direction, but the size and direction of the vibration or impact received by the lithium ion battery during transportation of the lithium ion battery is uncontrollable. Therefore, even if a spring is provided, there is still a risk of damage to the tab due to pulling.

[0070] The technical solutions of the present application will be further described below in conjunction with the embodiments and the accompanying drawings.

[0071] Please refer to Figures 1 to 5 , Figure 1 is a schematic diagram of a three-dimensional structure of an energy storage device provided by an embodiment of the present application, Figure 2 is a schematic diagram of a front view of an energy storage device provided by an embodiment of the present application, Figure 3 is a schematic diagram of a cross-sectional view of the energy storage device shown in Figure 2 along the A-A' direction, Figure 4 is an enlarged schematic diagram of the A region in Figure 3 Figure 5 is a schematic diagram of a three-dimensional structure of a tab, a pole and a current collector of the energy storage device shown in Figure 2 is an exploded schematic diagram of the tab, the pole and the current collector when the first elastic member is a spring, Figure 6 is an exploded schematic diagram of the tab, the pole and the current collector when the first elastic member is a spring, Figure 7 is an exploded schematic diagram of the tab, the pole and the current collector when the first elastic member is a spring.

[0072] An energy storage device 100 is provided by an embodiment of the present application, and the energy storage device 100 comprises a housing 110, an electric core 120, a pole 130, a current collector 140 and a first elastic member 150.

[0073] The electric core 120 is arranged in the housing 110. The pole 130 is provided with a mounting groove 131, and the pole 130 is electrically connected with the current collector 140 through the mounting groove 131. The current collector 140 serves as a flow member, and can enable the electric core 120 to output current to the outside through the current collector 140 and the pole 130.

[0074] The current collector 140 comprises a connecting sheet 141, which is used to be electrically connected with the electric core 120. For example, the connecting sheet 141 can be welded with the tab 121 of the electric core 120, so as to realize the fixation and electrical conduction of the electric core 120 and the connecting sheet 141.

[0075] The current collector 140 further comprises a protruding portion 142, which is arranged on the connecting sheet 141 in a protruding manner along a first direction P1. A part of the protruding portion 142 extends into the mounting groove 131, and abuts against a wall surface of the mounting groove 131 along the first direction P1. In a second direction P2 intersecting the first direction P1, the protruding portion 142 is movable relative to the pole 130 in the mounting groove 131, so as to adjust the position of the protruding portion 142 relative to the pole 130 in the second direction P2. For example, the first direction P1 can be an axial direction of the pole 130, and the second direction P2 can be a radial direction of the pole 130.

[0076] Of course, as another example, the second direction P2 can also be a direction intersecting both the axial direction (the first direction P1) of the pole 130 and the radial direction of the pole 130. In the present embodiment, the second direction P2 is taken as the radial direction of the pole 130 for illustration, but is not limited thereto. ​

[0077] One end of the first elastic member 150 is connected to the protruding portion 142, and the other end is connected to the wall surface of the mounting groove 131. The first elastic member 150 is used to keep the protruding portion 142 and the wall surface of the mounting groove 131 in abutment in the first direction P1, so as to keep the electrical connection between the pole 130 and the current collector 140, thereby keeping the energy storage device 100 to output stable electrical energy.

[0078] Optionally, the first elastic member 150 can be a spring, a spring piece, a silica gel member or a rubber member. When the first elastic member 150 is a spring or a spring piece, the first elastic member 150 can be a conductor or a non-conductor. It can be understood that when the first elastic member 150 is set as a conductor, the first elastic member 150 can also play a role of overcurrent, further increasing the overcurrent area.

[0079] In the energy storage device 100 of the present application, the protruding portion 142 of the current collector 140 extends into the mounting groove 131 formed by the pole 130 of the energy storage device 100, and the size of the mounting groove 131 in the second direction P2 perpendicular to the extension direction of the protruding portion 142 is greater than that of the protruding portion 142, so that the protruding portion 142 can move relative to the pole 130 in the second direction P2. In this way, when the energy storage device 100 is subjected to vibration or impact, and the displacement of the winding core of the energy storage device 100 occurs, the protruding portion 142 can move synchronously with the winding core under the driving of the tab 121, so as to avoid the tab 121 being pulled, thereby preventing the tab 121 from being torn or even completely broken, and further keeping the integrity of the tab 121.

[0080] It can be understood that the energy storage device 100 can include but is not limited to a single battery, a battery module, a battery pack, a battery system, etc. The actual application form of the energy storage device 100 provided by the embodiments of the present application can be but is not limited to the listed products, and can also be other application forms. The embodiments of the present application do not strictly limit the application form of the energy storage device 100. When the energy storage device 100 is a single battery, the energy storage device 100 can include but is not limited to a square battery, a cylindrical battery, etc.

[0081] In some embodiments, the distance between the protrusion 142 and the mounting groove 131 in the second direction P2 is 1mm-3mm. When the distance between the protrusion 142 and the wall of the mounting groove 131 is 1mm, the fit between the current collector 140 and the pole 130 can be more compact, reducing the volume of the energy storage device 100. When the distance between the protrusion 142 and the wall of the mounting groove 131 is 1mm-2mm, the current collector 140 can have a certain movement space relative to the pole 130, while the fit between the current collector 140 and the pole 130 can be relatively compact. When the distance between the protrusion 142 and the wall of the mounting groove 131 is 2mm-3mm, the current collector 140 can have a larger movement space relative to the pole 130, effectively preventing the tab 121 from breaking when the energy storage device 100 is subjected to vibration or impact.

[0082] In some embodiments, the shell 110 can include a groove structure having five walls. One wall of the groove structure serves as a bottom wall, and the other four walls are arranged around the edges of the bottom wall and are connected in turn to enclose an opening. The battery cell 120 is arranged in the groove structure.

[0083] In some embodiments, the energy storage device 100 can further include a top cover 111 arranged on the shell 110 to cover the opening of the groove structure, so that the battery cell 120 is contained in the space enclosed by the top cover 111 and the groove structure. The pole 130 can be arranged on the above-mentioned top cover 111, and the pole 130 is used to connect the electrical connector (such as an aluminum bar), and the battery cell 120 outputs electrical energy to the outside through the pole 130.

[0084] Please refer again to Figure 4 and Figure 5 In some embodiments, the pole 130 includes a first connecting portion 132 and a second connecting portion 133, the first connecting portion 132 and the second connecting portion 133 are connected, the first connecting portion 132 is provided with the above-mentioned mounting groove 131 on the side away from the second connecting portion 133, and the second connecting portion 133 is used to be electrically connected with the electrical connector.

[0085] In some embodiments, the first connecting portion 132 and the second connecting portion 133 can be fixed to each other by welding, clamping, screwing, etc., or can be integrally formed. In the present embodiment, the first connecting portion 132 and the second connecting portion 133 are integrally formed as an example, but are not limited thereto.

[0086] In some embodiments, the first connecting portion 132 is a square block body, has an opening in its axial direction, and the protrusion 142 penetrates into the mounting groove 131 from the opening. Of course, as other embodiments, the first connecting portion can also be a circular block body or other polygonal block body, etc.

[0087] In some embodiments, the pole 130 has a side opening (not shown in the figures) which is in communication with the mounting groove 131 along a third direction P3, and the protrusion 142 can be inserted into the mounting groove 131 along the third direction P3 through the side opening. The third direction P3 intersects the first direction PI and the second direction P2. In this way, the protrusion 142 can also have a space to move relative to the pole 130 along the third direction P3, and the energy storage device 100 can be further prevented from having the tab 121 broken when subjected to vibration or impact.

[0088] It can be understood that the side opening is an opening arranged in the radial direction of the first connecting portion 132.

[0089] In some embodiments, the side opening includes a first side opening, and the first connecting portion 132 is provided with the first side opening on the side wall of the mounting groove 131 (not shown in the figures), and the protrusion 142 can be inserted into the mounting groove 131 from the third direction P3 through the first side opening. The third direction P3 intersects the first direction PI and the second direction P2.

[0090] Please refer to Figure 8 , Figure 8 is Figure 7 the perspective structural schematic diagram of the first connecting portion shown in FIG. 2.

[0091] In some other embodiments, the side opening includes a second side opening 131a, and specifically, the first connecting portion 132 includes a connecting plate portion 132a and a plurality of side plate portions 132b, the plurality of side plate portions 132b are arranged at the edges of the connecting plate portion 132a, the connecting plate portion 132a and the plurality of side plate portions 132b enclose the mounting groove 131, and the plurality of side plate portions 132b also form the second side opening 131a, so that the protrusion 142 can be inserted into the mounting groove 131 along the third direction P3 from the second side opening 131a. Similarly, by arranging the second side opening 131a on the mounting groove 131, the protrusion 142 can be inserted into the mounting groove 131 along the third direction P3, the third direction P3 intersects the first direction PI and the second direction P2, and the protrusion 142 also has a space to move relative to the pole 130 along the third direction P3, which can further prevent the energy storage device 100 from having the tab 121 broken when subjected to vibration or impact.

[0092] In some embodiments, the side plate portions 132b are two, and the two side plate portions 132b are arranged in the second direction P2 to form two second side openings 131a extending in the second direction P2, and the two second side openings 131a are oppositely arranged in the third direction P3, and the protruding portion 142 can also be inserted into the mounting groove 131 from any one of the second side openings 131a. In this way, the movement direction of the protruding portion 142 relative to the pole 130 can be increased, and the movement space of the protruding portion 142 relative to the pole 130 in the third direction P3 can be increased.

[0093] In some embodiments, the third direction P3 can be perpendicular to the first direction P1 and the second direction P2 at the same time.

[0094] It should be noted that the following is described by taking the first connecting portion 132 including the connecting plate portion 132a and the two side plate portions 132b as an example, but it does not mean that the following related arrangements are only applicable to this example.

[0095] It can be understood that when the mounting groove 131 includes the connecting plate portion 132a and the two side plate portions 132b, the spacing between the protruding portion 142 and the wall surface of the mounting groove 131, specifically the spacing between the protruding portion 142 and the two side plate portions 132b.

[0096] In some embodiments, the second connecting portion 133 is a cylindrical block, and the first direction P1 is the axial direction of the second connecting portion 133, and the second direction P2 is the radial direction of the second connecting portion 133. Of course, the second connecting portion 133 can also be an elliptical cylinder, a triangular prism, a multi-prism, or other columnar structures.

[0097] Please refer again to Figure 8 , and refer to Figure 9 , Figure 9 is Figure 8 the front view of the first connecting portion shown in FIG. 1. In some embodiments, the mounting groove 131 includes a first groove body 131b and a second groove body 131c. Among them, the first groove body 131b and the second groove body 131c are arranged in the first direction P1 in sequence and communicate with each other, and in the second direction P2, the size of the second groove body 131c is larger than that of the first groove body 131b. In this way, a step structure can be formed at the position where the wall surface of the first groove body 131b and the wall surface of the second groove body 131c communicate with each other, and the step structure formed by the wall surface of the first groove body 131b and the wall surface of the second groove body 131c can limit the protruding portion 142 located in the second groove body 131c, prevent the protruding portion 142 from being separated from the second groove body 131c in the first direction P1, and thus ensure the connection between the protruding portion 142 and the first connecting portion 132. It can be understood that the second side opening 131a communicates with the first groove body 131b and the second groove body 131c.

[0098] Exemplarily, the protrusions 132c can be arranged at the ends of the two side plate portions 132b away from the connecting plate portion 132a, and the protrusions 132c of the two side plate portions 132b extend towards each other, so that the first connecting portion 132 forms the mounting groove 131, and in the first direction P1, the two protrusions 132c each form the stepped structure.

[0099] The space between the two protrusions 132c can form the first groove body 131b, and in the second direction P2, the protrusion portion 142 is at least partially smaller in size than the first groove body 131b, so that the protrusion portion 142 can also move relative to the first connecting portion 132.

[0100] In some embodiments, the first direction P1 can also coincide with the thickness direction of the connecting sheet body 141. In other words, the protrusion portion 142 protrudes from the surface of the connecting sheet body 141 along the thickness direction of the connecting sheet body 141.

[0101] In some embodiments, the connecting sheet body 141 and the protrusion portion 142 can be fixed by welding, screwing, clamping, inserting, etc., or can be integrally formed. In this embodiment, the connecting sheet body 141 and the protrusion portion 142 are integrally formed as an example, but are not limited thereto.

[0102] Please refer to Figures 10 to 16 , Figure 10 is a structural schematic diagram of a current collector with a square connecting sheet body in the embodiment of the application, Figure 11 is a structural schematic diagram of a current collector with an H-shaped connecting sheet body in the embodiment of the application, Figure 12 is a structural schematic diagram of a current collector with a waist-round connecting sheet body in the embodiment of the application, Figure 13 is a structural schematic diagram of a current collector with an oval connecting sheet body in the embodiment of the application, Figure 14 is a structural schematic diagram of a current collector with a strip-shaped connecting sheet body in the embodiment of the application, Figure 15 is a structural schematic diagram of a current collector with a Z-shaped connecting sheet body in the embodiment of the application, Figure 16 is a structural schematic diagram of a current collector with an hourglass-shaped connecting sheet body in the embodiment of the application.

[0103] In some embodiments, the connecting sheet body 141 can be square, H-shaped, waist-round, oval, strip-shaped, Z-shaped, hourglass-shaped or other shapes, as long as it can realize connection with the tab 121, and the application does not make specific limitations thereon. In this embodiment, the connecting sheet body 141 is square as an example, but the following related settings are not limited to this example.

[0104] Please refer to Figure 10In some embodiments, the protruding portion 142 of the current collector 140 includes a column portion 142a and an abutting portion 142b. The column portion 142a is protrudingly arranged on the surface of the connecting sheet 141 along the first direction P1. The column portion 142a at least partially extends into the first groove 131b. The abutting portion 142b is arranged at the end of the column portion 142a away from the connecting sheet 141 and is located in the second groove 131c. Along the second direction P2, the abutting portion 142b is movable in the second groove 131c relative to the pole tab 130. In this way, when the battery cell 120 is affected by vibration or impact and moves in the second direction P2, the abutting portion 142b can be driven by the tab 121 to move in the second direction P2 synchronously, avoiding the tab 121 being pulled by the battery cell 120 and the current collector 140, so as to prevent the tab 121 from being damaged.

[0105] In some embodiments, the abutting portion 142b protrudes from the column portion 142a along the second direction P2. The size of the abutting portion 142b along the second direction P2 is greater than the size of the first groove 131b along the second direction P2. The abutting portion 142b is located in the second groove 131c and can cooperate with the step structure formed by the wall surface of the first groove 131b and the wall surface of the second groove 131c, so as to be limited by the step structure, prevent the abutting portion 142b from being separated from the mounting groove 131, and ensure the effective connection between the protruding portion 142 and the pole tab 130.

[0106] It can be understood that the size of the column portion 142a along the second direction P2 is less than the size of the first groove 131b along the second direction P2. The size of the abutting portion 142b along the second direction P2 is less than the size of the second groove 131c along the second direction P2. The abutting portion 142b protrudes from both sides of the column portion 142a along the second direction P2. The abutting portion 142b protruding from both sides of the column portion 142a corresponds to the two protrusions 132c, respectively. The abutting portion 142b can be inserted into the second groove 131c from any one side opening 131a.

[0107] In some embodiments, the column portion 142a and the abutting portion 142b can be fixed by welding, screwing, clamping, inserting, etc. or can be integrally formed. In the present embodiment, the column portion 142a and the abutting portion 142b are integrally formed, but are not limited thereto.

[0108] In some embodiments, along the first direction P1, one end of the first elastic member 150 is connected to the abutting portion 142b, and the other end is connected to the wall surface of the second groove 131c. Optionally, the connection between the first elastic member 150 and the abutting portion 142b can be abutment, welding, clamping or inserting. Similarly, the connection between the first elastic member 150 and the wall surface of the second groove 131c can also be abutment, welding, clamping or inserting.

[0109] Please refer to Figure 17 and Figure 18 , Figure 17 is Figure 10 the front view of the current collector, Figure 18 is Figure 9 the first connecting part and Figure 17 the assembly view of the current collector.

[0110] In some embodiments, the abutting part 142b has a first face 142c and a second face 142d, the first face 142c is arranged on one face of the column part 142a, that is, the first face 142c is connected with the column part 142a, and the second face 142d is arranged opposite to the first face 142c. The second groove body 131c has a bottom face and a top face arranged opposite along the first direction P1.

[0111] In some embodiments, the surface of the connecting plate part 132a towards the two protrusions 132c constitutes the top face of the second groove body 131c, that is, the top face of the mounting groove 131, and the first elastic member 150 is arranged between the first face 142c and the two protrusions 132c. Specifically, the first elastic member 150 is arranged between the abutting part 142b protruding on both sides of the column part 142a and the two protrusions 132c correspondingly, and the first elastic member 150 drives the second face 142d to be close to the connecting plate part 132a and abut against the top face of the second groove body 131c, so that the second face 142d and the top face of the second groove body 131c realize flow-through, which can increase the area of the flow-through face and help to improve the flow-through efficiency.

[0112] In some embodiments, the surface of the first face 142c towards the two protrusions 132c and the surface of the two protrusions 132c towards the first face 142c (the bottom face of the second groove body 131c) can be arranged as a plane, so that the manufacturing difficulty of the pole piece 130 and the current collector 140 can be reduced, and the first elastic member 150 can be arranged between the first face 142c and the two protrusions 132c. At the same time, the surface of the first face 142c towards the two protrusions 132c and the surface of the two protrusions 132c towards the first face 142c are both arranged as a plane, so that there is no mutual limiting structure between the abutting part 142b and the two protrusions 132c in the plane constituted by the second direction P2 and the third direction P3, and the abutting part 142b can move arbitrarily in the plane constituted by the second direction P2 and the third direction P3, so as to improve the flexibility of the abutting part 142b.

[0113] In some embodiments, at least one first elastic member 150 can be arranged between each protrusion 132c and the first surface 142c. When multiple first elastic members 150 are arranged between each protrusion 132c and the first surface 142c, the multiple first elastic members 150 can be arranged at intervals along the third direction P3 to more evenly and stably support the abutting portion 142b.

[0114] It can be understood that when the surface of the first surface 142c facing the two protrusions 132c and the surface of the two protrusions 132c facing the first surface 142c are both flat, the first elastic member 150 can also be arranged between the second surface 142d and the top surface to make the first surface 142c and the two protrusions 132c abut.

[0115] Please refer to Figures 19 to 23 , Figure 19 is a perspective view of another first connecting portion according to an embodiment of the present application, Figure 20 is a front view of the first connecting portion shown in Figure 19 , Figure 21 is a perspective view of another current collector according to an embodiment of the present application, Figure 22 is a front view of the current collector shown in Figure 21 , Figure 23 is a perspective view of another first connecting portion according to an embodiment of the present application, Figure 20 is a front view of the first connecting portion shown in Figure 22 , and is an assembly view of the first connecting portion shown in

[0116] and the current collector shown in .

[0117] It can be understood that when the first elastic member 150 is arranged between the second surface 142d and the top surface of the second groove body 131c, one end of the first elastic member 150 is connected to the second surface 142d and the other end is connected to the connecting plate portion 132a.

[0118] In some embodiments, the first elastic member 150 can be one or more. When the first elastic member 150 is multiple, the multiple first elastic members 150 can be arranged at intervals between the second surface 142d and the connecting plate portion 132a. For example, the multiple first elastic members 150 can be arranged in an array.

[0119] In some embodiments, when the first elastic member 150 is arranged between the second surface 142d and the connecting plate portion 132a, the first surface 142c can be arranged as a first inclined surface, and the surfaces of the two protrusions 132c facing the first surface 142c can be arranged as second inclined surfaces. In this case, the first inclined surface and the second inclined surfaces can be arranged to be parallel to each other. In this way, compared with a design in which the first surface 142c and the surfaces of the two protrusions 132c facing the first surface 142c are arranged as flat surfaces, in the case of having the same size in the second direction P2, the first surface 142c and the surfaces of the two protrusions 132c facing the first surface 142c arranged as inclined surfaces can form a larger flow area and improve the flow efficiency. Of course, in other cases, the first surface 142c and the surfaces of the two protrusions 132c facing the first surface 142c can also be arranged as flat surfaces, so that the manufacturing difficulty and assembly difficulty of the pole piece 130 and the current collector 140 can be reduced.

[0120] In some embodiments, the first inclined surface and the second inclined surface are inclined relative to the second direction P2, and the inclination angle of the first inclined surface and the second inclined surface relative to the second direction P2 is α, and the size of α can be 5°-45°. By reasonably arranging the inclination angle of the first inclined surface and the second inclined surface, the manufacturing difficulty of the pole piece 130 and the current collector 140 can be reduced, while a larger flow area is formed between the pole piece 130 and the current collector 140.

[0121] When the inclination angle α is 5°-20°, the space between the two protrusions 132c and the connecting plate portion 132a is larger, and the abutting portion 142b has a larger movement space, which can better provide a buffer for the tab 121. When the inclination angle α is 20°-35°, the design requirements of large flow area and large movement space can be considered. When the inclination angle α is 35°-45°, a larger flow area can be formed, and the flow efficiency can be effectively improved.

[0122] In some embodiments, the first elastic member 150 can be arranged to be kept in a compressed state, so that the abutting portion 142b and the two protrusions 132c can be kept in abutment, so that a stable flow can be formed between the pole piece 130 and the current collector 140.

[0123] In some embodiments, the edge of at least one of the surface of the first connecting portion 132 perpendicular to the third direction P3 and the surface of the abutting portion 142b perpendicular to the third direction P3 is provided with a chamfer. In this way, the chamfer can be used as a guide structure to facilitate the insertion of the abutting portion 142b into the mounting groove 131 from the side opening 131a.

[0124] Optionally, the chamfer provided on the first connecting portion 132 and / or the abutting portion 142b can be an inclined chamfer or a round chamfer, which can be selected according to actual requirements, and the application does not make a specific limitation in this regard.

[0125] In some embodiments, one of the abutting portion 142b and the protrusion 132c is provided with a sliding groove (not shown in the figure) extending along the third direction P3, and the other is provided with a sliding rib (not shown in the figure) extending along the third direction P3 and cooperating with the sliding groove. When the protrusion 142 is inserted into the mounting groove 131 from the side opening 131a, the sliding rib is embedded in the sliding groove and can move relative to the sliding groove along the third direction P3.

[0126] In some embodiments, the width of the sliding groove in the second direction P2 is greater than the size of the sliding rib in the second direction P2, so that the sliding rib can also move relative to the sliding groove in the second direction P2.

[0127] Please refer to Figure 24 , Figure 24 is a schematic view of the assembly of the pole and the current collector and the second elastic member in the embodiments of the application.

[0128] In some embodiments, the energy storage device 100 further comprises a plurality of second elastic members 160, one end of each of the second elastic members 160 being connected to the protrusion 142 and the other end being connected to the wall surface of the mounting groove 131 in the second direction P2, and the plurality of second elastic members 160 are arranged at intervals. In this way, the design requirements of the movement of the protrusion 142 relative to the pole 130 can be met, while the collision and / or friction between the protrusion 142 and the pole 130 can be avoided, and the wear between the protrusion 142 and the pole 130 can be reduced.

[0129] It can be understood that when the first connecting portion 132 is sleeve-shaped, the plurality of second elastic members 160 can be arranged at intervals in the circumferential direction of the abutting portion 142b, thereby providing buffering in the circumferential direction of the abutting portion 142b.

[0130] When the first connecting portion 132 is composed of the connecting plate portion 132a and the two side plate portions 132b, the plurality of second elastic members 160 can be arranged on opposite sides of the abutting portion 142b in the second direction P2, i.e. the second elastic members 160 are arranged between the abutting portions 142b protruding from the two sides of the columnar portion 142a and the corresponding side plate portions 132b. Furthermore, the second elastic members 160 arranged between the abutting portions 142b protruding from the two sides of the columnar portion 142a and the corresponding side plate portions 132b are at least one. When the second elastic members 160 arranged between the abutting portions 142b protruding from the two sides of the columnar portion 142a and the corresponding side plate portions 132b are a plurality, the plurality of second elastic members 160 can be arranged at intervals in the third direction P3.

[0131] Optionally, the second elastic member 160 can be a spring, a spring piece, a silica gel member or a rubber member. When the second elastic member 160 is a spring or a spring piece, the second elastic member 160 can be a conductor or a non-conductor.

[0132] Referring to Figure 25 , Figure 25 is a structural schematic diagram of an energy storage system in an embodiment of the present application.

[0133] The present application also provides an energy storage system 200, which comprises the energy storage device 100 of any of the above embodiments.

[0134] Taking a household energy storage scenario in user-side energy storage as an example, the energy storage system 200 can comprise an electric energy conversion device 210, a first user load 220, a second user load 230 and the above energy storage device 100, and the electric energy conversion device 210 is electrically connected to the energy storage device 100.

[0135] The electric energy conversion device 210 can be a photovoltaic panel, which can receive solar energy and convert the solar energy into electric energy. In a low electricity price period, the converted electric energy can be stored in the energy storage device 100, and in a high electricity price period, the electric energy stored in the energy storage device 100 can be used to supply power to the first user load 220 and the second user load 230, or to supply power in a power grid outage / power failure.

[0136] The first user load 220 can be a street lamp, and the second user load 230 can be a household appliance such as an air conditioner or a refrigerator. The energy storage device 100 can be a small energy storage box, which can be installed on a wall by a wall-mounted manner.

[0137] Referring to Figure 26 , Figure 26 is a structural schematic diagram of another energy storage system in an embodiment of the present application.

[0138] The present application also provides an energy storage system 300, which comprises the energy storage device 100 of any of the above embodiments.

[0139] Taking a distribution / transmission side shared energy storage scenario as an example, the energy storage system 300 comprises a high-voltage cable 310, a first electric energy conversion device 320, a second electric energy conversion device 330 and the above energy storage device 100. The high-voltage cable 310 is electrically connected to the first electric energy conversion device 320, the second electric energy conversion device 330 and the energy storage device 100, and the first electric energy conversion device 320 and the second electric energy conversion device 330 are electrically connected to the energy storage device.

[0140] The first electric energy conversion device 320 can be a photovoltaic panel that can receive solar energy and convert the solar energy into electric energy. The second electric energy conversion device 330 can be a windmill that can convert wind energy into electric energy. When generating electricity, the first electric energy conversion device 320 and the second electric energy conversion device 330 supply the converted electric energy to the power grid through the high-voltage cable 310 for use by the power grid. When the power consumption load is small and the first electric energy conversion device 320 and the second electric energy conversion device 330 generate excess electricity, the excess electricity is stored in the energy storage device 100, which can reduce the wind curtailment rate and the light curtailment rate and improve the problem of new energy power generation consumption. When the power consumption load is large, the power grid issues an instruction to supply the electric energy stored in the energy storage device 100 to the power grid in a grid-connected mode through the high-voltage cable 310 for use by the power grid, thereby providing various services such as peak shaving, frequency modulation, backup, and the like for the operation of the power grid, fully playing the role of peak shaving of the power grid, promoting the peak shaving and valley filling of the power grid, and relieving the power supply pressure of the power grid.

[0141] In other embodiments, the first electric energy conversion device 320 and the second electric energy conversion device 330 can also be devices that convert at least one of thermal energy, tidal energy, biomass energy, and mechanical energy into electric energy.

[0142] The above describes the energy storage device and the energy storage system disclosed in the embodiments of the present application in detail. The principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the energy storage device and the energy storage system and the core idea thereof; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. An energy storage device, characterized by, The energy storage device comprises: a housing; an electrode core arranged in the housing; a pole provided with a mounting groove; and a current collector comprising: a connecting sheet configured to be electrically connected to the electrode core; a protruding portion protruding in a first direction from the connecting sheet, the protruding portion being configured to partially extend into the mounting groove and abut against a wall surface of the mounting groove in the first direction, and the protruding portion being movable in a second direction in the mounting groove to adjust a position of the protruding portion relative to the pole in the second direction; and a first elastic member having one end connected to the protruding portion and the other end connected to the wall surface of the mounting groove, the first elastic member being configured to keep the protruding portion in abutment against the wall surface of the mounting groove in the first direction. The first direction is an axial direction of the pole, and the second direction is perpendicular to the first direction.

2. The energy storage device of claim 1, wherein, The mounting groove comprises a first groove body and a second groove body arranged in sequence and in communication in the first direction, and the second groove body has a size greater than that of the first groove body in the second direction. The protruding portion comprises a columnar portion protruding in the first direction from the connecting sheet and at least partially extending into the first groove body, and the columnar portion has a size smaller than that of the first groove body in the second direction; and an abutment portion arranged at one end of the columnar portion away from the connecting sheet, the abutment portion having a size greater than that of the first groove body in the second direction, the abutment portion being located in the second groove body and movable in the second direction in the second groove body, and one end of the first elastic member being connected to the abutment portion and the other end of the first elastic member being connected to the wall surface of the second groove body in the first direction.

3. The energy storage device of claim 2, wherein, The abutment portion has a first surface arranged at the columnar portion and a second surface arranged opposite to the first surface, and the second groove body has a bottom surface and a top surface arranged opposite to each other in the first direction, the first elastic member being connected between the first surface and the bottom surface of the second groove body and / or being connected between the second surface and the top surface of the second groove body.

4. The energy storage device of claim 3, wherein, When the first elastic member is connected between the second surface and the top surface of the second groove body, the first surface is configured as a first inclined surface, the bottom surface of the second groove body is configured as a second inclined surface, and the first inclined surface is configured to be connected to the second inclined surface.

5. The energy storage device of claim 4, wherein, The first inclined surface and the second inclined surface are inclined relative to the second direction, and the first inclined surface and the second inclined surface have an inclination angle of 5°-45° relative to the second direction.

6. The energy storage device of claim 3, wherein, When the first elastic member is connected between the first surface and the bottom surface of the second groove, the first surface is configured as a first plane, the top surface of the second groove is configured as a second plane, and the abutting portion is configured to abut against the top surface of the second groove under the action of the first elastic member.

7. The energy storage device of any one of claims 1-6, wherein, The pole is provided with a side opening, the side opening is communicated with the mounting groove along a third direction, and the protruding portion can be inserted into the mounting groove through the side opening along the third direction. The third direction is perpendicular to the first direction and the second direction.

8. The energy storage device of any one of claims 1-6, wherein, In the second direction, a distance between the protruding portion and a wall surface of the mounting groove in the second direction is 1-3 mm.

9. The energy storage device of any one of claims 1-6, wherein, The energy storage device further comprises a plurality of second elastic members, one end of each of the second elastic members is connected to the protruding portion, the other end of each of the second elastic members is connected to the wall surface of the mounting groove, and the second elastic members are arranged at intervals.

10. An energy storage system characterized by, An energy storage device as claimed in any one of claims 1-9.

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