Base, battery cell group and energy storage system

Abstract

The utility model discloses a base, a battery cell group and an energy storage system, and belongs to the technical field of batteries. The base comprises a base body and a base plate; the base body is provided with a mounting surface for mounting a leading-out electrode busbar and an external busbar of the battery cell group; the fastener is used for connecting the leading-out electrode busbar and the external busbar of the battery cell group; the insert is embedded into the seat body and is connected with the fastener; wherein at least two inserts with different sizes exist in the embedding direction. By using the structure, the contact area and the friction force between the insert and the seat body are increased, the axial drawing resistance of the insert is remarkably improved, and the risk of loosening and falling of the insert caused by long-term use or external factors is reduced, so that the binding force between the insert and the seat body is enhanced, and the service life of the insert is prolonged. And the long-term stability and reliability of assembling the leading-out electrode busbar and the external busbar on the base are further improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a base, a battery cell group and an energy storage system. Background Art

[0002] During the assembly of a battery pack, the effective connection of the lead-out busbar and the external busbar is critical to ensuring the proper operation and safety of the battery system. Traditional base designs often use simple fastening structures, but over long-term use, due to factors such as vibration and temperature fluctuations, the fastening components are prone to loosening, which in turn affects the performance and safety of the battery pack. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a base, a battery cell group, and an energy storage system, which improve the long-term stability and reliability of the assembly of the lead-out busbar and the external busbar on the base.

[0004] In a first aspect, the present application provides a base, applied to a battery pack, comprising:

[0005] A base body having a mounting surface for mounting the lead-out busbar and the external busbar of the battery cell group;

[0006] A fastener, used to connect the lead-out busbar and the external busbar of the battery cell group;

[0007] An insert is embedded in the seat and connected to the fastener; wherein the insert has at least two locations with different sizes along the embedding direction.

[0008] According to the base of the present application, through the structural design that the above-mentioned insert has at least two locations with different sizes along the embedding direction, combined with the embedded integrated design between the insert and the base body, the contact area and friction between the insert and the base body are increased, the axial pull-out resistance of the insert is significantly improved, and the risk of loosening and falling off of the insert due to long-term use or external factors is effectively reduced, thereby enhancing the bonding force between the insert and the base body, and further improving the long-term stability and reliability of the lead-out bus and the external bus assembled on the base.

[0009] According to one embodiment of the present application, the insert includes a plurality of first segments and a plurality of second segments staggered along the embedding direction, and the cross-sectional area of ​​the first segment is greater than the cross-sectional area of ​​the second segment.

[0010] According to one embodiment of the present application, the outer contour of the orthographic projection of at least one of the first segment and the second segment along the connection direction between the fastener and the insert is a polygon.

[0011] According to one embodiment of the present application, the first section has a polygonal outer contour in the projection along the connecting direction of the fastener and the insert, and the second section has a circular outer contour in the projection along the connecting direction of the fastener and the insert.

[0012] According to one embodiment of the present application, the base is used for mounting on an end plate of the battery cell group; wherein the seat body comprises:

[0013] A support table is formed on the mounting surface;

[0014] An assembly table is connected to one side of the support table away from the mounting surface;

[0015] A positioning member is connected to the assembly table for positioning cooperation with the end plate.

[0016] According to one embodiment of the present application, the positioning member has a guide inclined surface which is arranged obliquely towards the assembly table along the embedding direction.

[0017] According to one embodiment of the present application, part of the insert is embedded in the support table and the assembly table.

[0018] According to one embodiment of the present application, the edge of the mounting surface is provided with an insulating baffle.

[0019] In a second aspect, the present application provides a battery cell group, which comprises:

[0020] A plurality of battery cells, the pole of the battery cell is located on the side of the battery cell;

[0021] An end plate is arranged on both ends of the plurality of battery cells along the stacking direction;

[0022] A lead-out pole bus bar, the plurality of battery cells are electrically connected through the lead-out pole bus bar;

[0023] The base of any one of the above solutions is arranged on the side of the end plate;

[0024] An external bus bar, the lead-out pole bus bar and the external bus bar are connected to the mounting surface of the base through the fastener of the base.

[0025] According to the battery cell group of the present application, by arranging the above-mentioned base, the contact area and friction between the insert and the seat body are increased, the anti-pulling ability of the insert along the axial direction is significantly improved, the risk of the insert loosening and falling off due to long-term use or external factors is effectively reduced, the binding force between the insert and the seat body is enhanced, the long-term stability and reliability of the assembly of the lead-out pole bus bar and the external bus bar on the base are improved, and the performance and safety of the battery cell group are further improved.

[0026] In a third aspect, the present application provides an energy storage system, comprising:

[0027] Cabinet;

[0028] At least one battery cell group as described above is arranged in the cabinet.

[0029] According to the energy storage system of the present application, the contact area and friction between the insert and the base body are increased through the arrangement of the above-mentioned battery cell group, which significantly improves the axial pull-out resistance of the insert, and effectively reduces the risk of the insert loosening and falling off due to long-term use or external factors, thereby enhancing the bonding force between the insert and the base body, and improving the long-term stability and reliability of the assembly of the lead-out bus and the external bus on the base, thereby improving the performance and safety of the battery cell group.

[0030] In a fourth aspect, the present application provides an electrical device, comprising:

[0031] At least one battery cell group as described above, wherein the battery cell group is used to provide electrical energy.

[0032] According to the electrical device of the present application, through the arrangement of the above-mentioned battery cell group, the contact area and friction between the insert and the base body are increased, the axial pull-out resistance of the insert is significantly improved, and the risk of loosening and falling off of the insert due to long-term use or external factors is effectively reduced, thereby enhancing the bonding force between the insert and the base body, and improving the long-term stability and reliability of the lead-out bus and the external bus assembled on the base, thereby improving the performance and safety of the battery cell group.

[0033] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 This is a partial structural diagram of a battery cell assembly provided in an embodiment of the present application;

[0036] Figure 2 This is a schematic diagram of the assembly of the end plate and the base provided in an embodiment of the present application;

[0037] Figure 3 1 is a schematic diagram of the assembly of the seat, fasteners and inserts provided in an embodiment of the present application;

[0038] Figure 4is a cross-sectional view of a base, an output busbar, and an external busbar provided in an embodiment of the present application;

[0039] Figure 5 This is a schematic diagram of the embedding of the seat and the insert provided in the embodiment of the present application;

[0040] Figure 6 It is a structural schematic diagram of the seat provided in an embodiment of the present application;

[0041] Figure 7 is a side view of the seat provided in an embodiment of the present application;

[0042] Figure 8 It is a schematic diagram of the structure of the insert provided in the embodiment of the present application.

[0043] Reference numerals:

[0044] Base 100;

[0045] Base body 110, support platform 111, mounting surface 1111, assembly platform 112, positioning member 113, guide slope 1131, insulating baffle 114;

[0046] Fastener 120;

[0047] Insert 130, first section 131, second section 132;

[0048] Battery cell 200, lead-out busbar 300, external busbar 400;

[0049] End plate 500 , mounting groove 510 , positioning hole 520 . DETAILED DESCRIPTION

[0050] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0051] The present application provides a base 100 for use in a battery cell pack.

[0052] Reference below Figures 1-8 The base 100 according to an embodiment of the present application is described.

[0053] In some embodiments, as Figure 3 As shown, the base 100 includes a base body 110 , a fastener 120 and an insert 130 .

[0054] like Figure 4 and Figure 5As shown, the seat body 110 has a mounting surface 1111 for mounting the lead-out bus bars 300 and the external bus bars 400 of the battery cell group; the fastener 120 is used to connect the lead-out bus bars 300 and the external bus bars 400 of the battery cell group; the insert 130 is embedded in the seat body 110, and the insert 130 is connected with the fastener 120; wherein the insert 130 has at least two different sizes in the embedding direction.

[0055] The seat body 110 is the main structure of the base 100, and is usually made of insulating materials such as plastic, rubber, etc.

[0056] As shown, Figures 4-7 The seat body 110 can be formed with a mounting surface 1111 specially used for mounting the lead-out bus bars 300 and the external bus bars 400 of the battery cell group, and the mounting surface 1111 can be a smooth plane to enable the lead-out bus bars 300 and the external bus bars 400 to be accurately aligned and stably connected.

[0057] The fastener 120 is used to connect the lead-out bus bars 300 and the external bus bars 400 of the battery cell group, and the fastener 120 can be a common fastening element such as a bolt, a nut, a rivet, etc. Through the action of the fastener 120, the lead-out bus bars 300 and the external bus bars 400 are firmly combined together to form a conductive path.

[0058] For example, in some embodiments, as shown, Figure 3 The fastener 120 is a bolt.

[0059] The insert 130 is embedded in the seat body 110 and connected with the fastener 120, and the insert 130 can be made of a metal material with excellent electrical conductivity and mechanical strength, such as aluminum alloy, stainless steel, etc.

[0060] The connection mode of the insert 130 and the fastener 120 can include but is not limited to threaded connection, riveting, clamping, etc., which is not limited here.

[0061] For example, in some embodiments, as shown, Figure 4 The connection mode of the insert 130 and the fastener 120 is threaded connection to facilitate disassembly and maintenance, and specifically, the insert 130 can have a threaded hole, and the fastener 120 can have an external thread.

[0062] It is understandable that in order to avoid accidental short circuits, electrical breakdown and flashover, a certain electrical gap needs to be maintained between the end plate 500 and the lead-out bus 300 and the external bus 400, and the base 110 is usually made of insulating materials such as plastic, rubber, etc. Considering that insulating materials such as plastic and rubber are relatively weak in structural strength, when relevant personnel use tooling to fasten the fastener 120 to the base 110, the base 110 is very likely to crack. In this case, the present application embeds a stronger insert 130 into the base 110 and combines it with the base 110 as a whole. In this way, the insert 130 can replace the base 110 and be directly connected to the fastener 120 to reduce the risk of damage to the base 110.

[0063] In actual implementation, Figure 1 and Figures 3-5 As shown, taking the base 110 as made of plastic and the insert 130 as made of metal as an example, the insert 130 can be embedded in the base 110 by insert injection molding, hot melt inserting, or press-in inserting. During the installation of the lead-out bus 300 and the external bus 400, the lead-out bus 300 and the external bus 400 are stacked on the mounting surface 1111, and the fastener 120 is used to penetrate the lead-out bus 300 and the external bus 400. Finally, the protruding part of the fastener 120 is connected to the insert 130 and fully tightened, so that the stacked lead-out bus 300 and the external bus 400 are pressed against the mounting surface 1111, and the two are pressed against each other to maintain a firm and stable electrical connection. Among them, since the insert 130 is inserted in the embedding direction ( Figure 5 The insert 130 has at least two locations (indicated by the middle arrow) with different sizes. In other words, the outer contour of the insert 130 along the insertion direction is uneven, forming a stepped structure. This stepped structure increases the contact area and friction between the insert 130 and the base 110, significantly improving the insert 130's pull-out resistance, effectively reducing the risk of the insert 130 loosening and falling due to long-term use or external factors, and strengthening the bonding between the insert 130 and the base 110.

[0064] The base 100 provided in the embodiment of the present application has a structural design in which the above-mentioned insert 130 has at least two locations of different sizes along the embedding direction, combined with the embedded integrated design between the insert 130 and the base body 110, thereby increasing the contact area and friction between the insert 130 and the base body 110, significantly improving the axial pull-out resistance of the insert 130, and effectively reducing the risk of loosening and falling off of the insert 130 due to long-term use or external factors, thereby enhancing the bonding force between the insert 130 and the base body 110, and further improving the long-term stability and reliability of the assembly of the lead-out bus 300 and the external bus 400 on the base 100.

[0065] In some embodiments, as Figure 8As shown, the insert 130 includes a plurality of first segments 131 and a plurality of second segments 132 staggered along the embedding direction, and the cross-sectional area of ​​the first segment 131 is greater than the cross-sectional area of ​​the second segment 132 .

[0066] Here, multiple means two or more.

[0067] For example, in some embodiments, Figure 8 As shown, the insert 130 includes four first segments 131 and three second segments 132 that are staggered along the inserting direction.

[0068] In this embodiment, if Figure 4 and Figure 8 As shown, the plurality of first segments 131 and the plurality of second segments 132 staggered along the embedding direction can be an integrated structure, and the first segments 131 and the second segments 132 can both be designed as an annular structure. Specifically, the inner side walls of the plurality of first segments 131 and the plurality of second segments 132 can be provided with a threaded structure so that the entire insert 130 has a threaded hole for cooperating with the external thread of the fastener 120. The threaded hole is a blind hole, that is, the end of the insert 130 facing away from the lead-out bus 300 is closed. During injection molding, the insert 130 will face the closed end and be inserted into the seat body 110, so that the uncured liquid plastic will not enter the threaded hole and affect the subsequent assembly of the fastener 120.

[0069] It is understood that during the insertion process of insert 130, the first section 131 and the second section 132 are staggered along the insertion direction. This design causes insert 130 to form a corrugated structure within base 110. When insert 130 is subjected to external forces (such as vibration, temperature changes, etc.), this corrugated structure effectively disperses and absorbs stress, reducing the risk of damage to insert 130 due to stress concentration. Furthermore, due to the different cross-sectional areas of first section 131 and second section 132, first section 131 has a larger cross-sectional area and higher mechanical strength, providing stronger support when insert 130 is subjected to axial tension, while the smaller cross-sectional area of ​​second section 132 allows it to deform under tension, thereby absorbing and dispersing the tension, further enhancing the pull-out resistance of insert 130. Furthermore, the staggered arrangement of first section 131 and second section 132 allows insert 130 to achieve a more compact and efficient design within the limited space of base 110.

[0070] In some embodiments, as Figure 8 As shown, at least one of the first section 131 and the second section 132 is arranged along the connection direction between the fastener 120 and the insert 130 ( Figure 3 The outer contour of the orthographic projection (indicated by the arrow in the middle) is a polygon.

[0071] For example, in some embodiments, Figure 8As shown, the outer contour of the first section 131 along the normal projection of the connecting direction of the fastener 120 and the insert 130 is polygonal.

[0072] For example, in some embodiments, the outer contour of the first section 131 along the normal projection of the connecting direction of the fastener 120 and the insert 130 is polygonal, and the outer contour of the second section 132 along the normal projection of the connecting direction of the fastener 120 and the insert 130 is circular.

[0073] For example, in some embodiments, the outer contour of the first section 131 along the normal projection of the connecting direction of the fastener 120 and the insert 130 is polygonal, and the outer contour of the second section 132 along the normal projection of the connecting direction of the fastener 120 and the insert 130 is circular.

[0074] In actual implementation, as shown in Figure 8 As shown, the insert 130 as a whole can be in a columnar shape, and the polygonal outer contour can be formed by mold forming or cutting processing during the manufacturing process of the insert 130. This design not only changes the shape of the insert 130 in the circumferential direction, but also has a significant impact on the mechanical properties of the insert 130. When the fastener 120 is connected with the insert 130, the polygonal outer contour of the insert 130 can effectively resist the torsional force in the circumferential direction.

[0075] The base 100 provided by the embodiments of the present application has the design that at least one of the first section 131 and the second section 132 has a polygonal outer contour, so that the insert 130 has stronger structural rigidity in the circumferential direction, can effectively resist the torsional force in the circumferential direction, further reduces the risk of the insert 130 loosening and falling off, and further enhances the bonding force between the insert 130 and the seat body 110.

[0076] In some embodiments, as shown in Figure 8 As shown, the outer contour of the first section 131 along the normal projection of the connecting direction of the fastener 120 and the insert 130 is polygonal, and the outer contour of the second section 132 along the normal projection of the connecting direction of the fastener 120 and the insert 130 is circular.

[0077] The polygonal shape can be a triangle, a quadrilateral, a pentagon, or a hexagon, and the specific shape is selected according to design requirements and actual application scenarios, which is not limited herein.

[0078] For example, in some embodiments, as shown in Figure 8 As shown, the outer contour of the first section 131 along the normal projection of the connecting direction of the fastener 120 and the insert 130 is polygonal, and the outer contour of the second section 132 along the normal projection of the connecting direction of the fastener 120 and the insert 130 is circular.

[0079] For example, in some embodiments, the outer contour of the first section 131 along the normal projection of the connecting direction of the fastener 120 and the insert 130 is polygonal, and the outer contour of the second section 132 along the normal projection of the connecting direction of the fastener 120 and the insert 130 is circular.

[0080] In actual implementation, as shown in Figure 3 and Figure 8 , the orthogonal projection of the first section 131 in the direction of the connection between the fastener 120 and the insert 130 presents a polygon, and such a design makes the first section 131 have stronger structural rigidity and anti-torsion capability in the circumferential direction, which helps to reduce the torsion or loosening of the insert 130 when subjected to external force. The orthogonal projection of the second section 132 in the direction of the connection between the fastener 120 and the insert 130 presents a circle, and the design of the circular outer contour makes the second section 132 more smoothly enter the inside of the seat body 110 during embedding, reducing friction and resistance, and at the same time, the circular outer contour also provides better stress dispersion effect, which helps to reduce the stress concentration phenomenon and improve the durability and service life of the insert 130. In addition, the design of the first section 131 with a larger cross-sectional area into a polygonal outer contour also helps to reduce the processing difficulty of the insert 130.

[0081] The base 100 provided by the embodiment of the application has the structural design that the first section 131 has a polygonal outer contour and the second section 132 has a circular outer contour, which combines the advantages of the polygonal outer contour and the circular outer contour, improves the anti-torsion capability of the insert 130 in the circumferential direction, and makes the insert 130 be able to more uniformly distribute stress when subjected to external force, reduces the stress concentration phenomenon, thereby improving the durability and service life of the insert 130, and in addition, helps to reduce the processing difficulty of the insert 130, thereby improving the production efficiency.

[0082] In some embodiments, as shown in Figure 1 , Figure 2 , Figure 6 and Figure 7 , the base 100 is used for mounting on an end plate 500 of a battery cell group; wherein the seat body 110 comprises a support table 111, an assembly table 112 and a positioning piece 113.

[0083] As shown in Figure 2 , Figure 6 and Figure 7 , the support table 111 forms a mounting surface 1111; the assembly table 112 is connected to one side of the support table 111 away from the mounting surface 1111; and the positioning piece 113 is connected to the assembly table 112, and the positioning piece 113 is used for positioning cooperation with the end plate 500.

[0084] In this implementation, as shown in Figure 1 , Figure 2 , Figure 6 and Figure 7As shown, the base 100 is installed on the end plate 500 to avoid the notch of the lead-out bus 300 and the external bus 400. The bottom wall of the notch on the end plate 500 can be provided with a mounting groove 510, and the assembly platform 112 can be installed in the mounting groove 510. The side wall of the mounting groove 510 can be provided with a positioning hole 520 that cooperates with the positioning member 113. In this way, the base 100 is pre-fixed on the end plate 500 before the lead-out bus 300 and the external bus 400 are installed, thereby reducing the difficulty of production line production. Among them, the positioning member 113 can be integrally formed with the assembly platform 112. Specifically, the size of the mounting groove 510 can be designed to be slightly larger than the size of the assembly platform 112, so that the assembly platform 112 and the positioning member 113 can be inserted into the mounting groove 510 more smoothly without causing excessive wear and damage to the positioning member 113.

[0085] There may be multiple positioning members 113 , where multiple means two or more.

[0086] For example, in some embodiments, Figure 2 、 Figure 6 and Figure 7 As shown, the assembly platform 112 is designed to be a rectangular parallelepiped, and the four positioning members 113 are respectively connected to the four side walls of the assembly platform 112 . Correspondingly, four positioning holes 520 are provided on the end plate 500 .

[0087] The shape of the positioning member 113 may include but is not limited to a cylindrical shape, a prismatic shape, a semi-disc shape, etc., which is not limited here.

[0088] For example, in some embodiments, the positioning member 113 is cylindrical in shape.

[0089] The base 100 provided in the embodiment of the present application realizes the pre-installation of the insert 130 on the end plate 500 of the battery cell group through the arrangement of the above-mentioned assembly table 112 and the positioning member 113, thereby reducing the difficulty of production line production. Combined with the positioning and matching design of the positioning member 113 and the end plate 500, the accuracy and stability of the base 100 during the installation process can be improved, thereby improving the overall installation accuracy of the battery cell group.

[0090] In some embodiments, as Figure 7 As shown, the positioning member 113 has a guide slope 1131, and the guide slope 1131 is along the embedding direction (such as Figure 3 The middle arrow indicates that the assembling platform 112 is tilted.

[0091] The guide slope 1131 can be formed on the positioning member 113 by machining (such as milling, grinding, etc.) or injection molding. The inclination angle of the guide slope 1131 needs to be accurately calculated and designed according to the shape and size of the end plate 500 and the movement trajectory during installation.

[0092] It is understandable that if Figure 2 and Figure 7 As shown, during the installation of the base 100 onto the cell group end plate 500, the guide bevel 1131 first contacts the installation groove 510 on the end plate 500. The guide bevel 1131 can guide the assembly platform 112 of the base 100 to gradually insert into the installation groove 510 along the correct direction until the positioning member 113 is fully matched with the positioning hole 520 on the end plate 500. On the one hand, the design of the guide bevel 1131 makes it easier for the base 100 to find the correct installation position during installation, reducing installation time and difficulty, while effectively improving the installation accuracy of the base 100; on the other hand, the guide bevel 1131 can also reduce friction and resistance during installation to a certain extent, allowing the base 100 to be installed more smoothly on the end plate 500; on the other hand, during the installation of the base 100, the contact between the guide bevel 1131 and the end plate 500 is gradually increased, which helps to reduce impact and damage to the end plate 500 during installation.

[0093] In some embodiments, as Figure 4 As shown, a portion of the insert 130 is embedded in both the support platform 111 and the assembly platform 112 .

[0094] It can be understood that, based on the fact that part of the insert 130 is embedded in both the support platform 111 and the assembly platform 112, in other words, the insert 130 is embedded at least into the assembly platform 112 along the embedding direction, so that the embedding length of the insert 130 can be increased as much as possible, thereby increasing the contact area between the insert 130 and the base body 110. In this case, the connection area between the insert 130 and the fastener 120 can also be increased as much as possible, further enhancing the pull-out resistance and torsional resistance of the insert 130, while enhancing the fastening force between the insert 130 and the fastener 120, thereby minimizing the probability of the lead-out bus 300 and the external bus 400 loosening during transportation or use.

[0095] In some embodiments, as Figure 6 and Figure 7 As shown, an insulating baffle 114 is provided at the edge of the mounting surface 1111 .

[0096] The insulating baffle 114 may be made of insulating materials, such as plastic, rubber, ceramic or glass.

[0097] In actual implementation, Figure 1 、 Figure 2 、 Figure 6 and Figure 7As shown, the base 100 is installed on the end plate 500 to avoid the notch of the lead-out busbar 300 and the external busbar 400. The bottom wall of the notch on the end plate 500 can be provided with a mounting groove 510, and the assembly platform 112 can be installed in the mounting groove 510. The base 100 can be spaced apart from the upper wall and the lower wall of the notch. In order to further optimize the insulation effect between the lead-out busbar 300 and the external busbar 400 and the end plate 500, an insulating baffle 114 is provided on one edge of the mounting surface 1111 close to the upper wall of the notch, and an insulating baffle 114 is provided on the mounting surface 1111. An insulating baffle 114 is also provided on an edge of the lower wall near the notch. The insulating baffle 114 is integrally formed with the support platform 111. Both insulating baffles 114 extend to the notch protruding from the end plate 500. The lead-out bus 300 and the external bus 400 are stacked between the two insulating baffles 114. By providing the insulating baffle 114, the electrical insulation gap between the lead-out bus 300, the external bus 400 and the end plate 500 is changed to a creepage distance, providing more reliable safety protection between the lead-out bus 300, the external bus 400 and the end plate 500.

[0098] The base 100 provided in the embodiment of the present application, through the setting of the above-mentioned insulating baffle 114, increases the safety distance between the lead-out bus 300 and the external bus 400 and the end plate 500 without interfering with the lead-out bus 300 and the external bus 400, and provides more reliable safety protection between the lead-out bus 300 and the external bus 400 and the end plate 500, thereby reducing the probability of occurrence of accidental short circuits, electrical breakdowns and flashovers as much as possible, thereby maintaining the safe operation of the entire battery cell group.

[0099] The present application also provides a battery cell pack.

[0100] In some embodiments, as Figure 1 As shown, the battery cell group includes: an end plate 500, an output busbar 300, an external busbar 400, a plurality of battery cells 200 and a base 100 as in any of the above solutions.

[0101] The poles of the battery cell 200 are located on the side of the battery cell 200; the end plates 500 are arranged in pairs at both ends of the multiple battery cells 200 along the stacking direction; the multiple battery cells 200 are electrically connected through the lead-out bus 300; the base 100 is arranged on the side of the end plate 500; the lead-out bus 300 and the external bus 400 are connected to the mounting surface 1111 of the base 100 through the fasteners 120 of the base 100.

[0102] The lead-out busbar 300 may be made of a metal busbar, such as an aluminum busbar, a copper busbar, etc.; the external busbar 400 may be made of a metal busbar, such as an aluminum busbar, a copper busbar, etc.

[0103] For example, in some embodiments, the lead-out pole bus bar 300 is an aluminum bus bar, and the external bus bar 400 is a copper bus bar.

[0104] The electric cell 200 can be, but is not limited to, a soft package cell, a blade cell, or a square cell, and the like, which are not limited herein.

[0105] For example, in some embodiments, as shown in FIG. 2A, the electric cell 200 is a blade cell. Figure 1

[0106] In this embodiment, as shown in FIG. 2B, the pole of the electric cell 200 is in a side-out form, and correspondingly, the notch on the end plate 500 for avoiding the lead-out pole bus bar 300 and the external bus bar 400 is also arranged at the side edge, and thus the base 100 is also arranged in the notch at the side edge of the end plate 500. Figure 1

[0107] The electric cell group provided by the embodiments of the present application increases the contact area and friction force between the insert 130 and the seat body 110 by arranging the base 100, significantly improves the anti-pulling ability of the insert 130 along the axial direction, effectively reduces the risk of loosening and falling off of the insert 130 due to long-term use or external factors, thereby enhancing the binding force between the insert 130 and the seat body 110, improving the long-term stability and reliability of the assembly of the lead-out pole bus bar 300 and the external bus bar 400 on the base 100, and further improving the performance and safety of the electric cell group.

[0108] The present application also provides an energy storage system.

[0109] In some embodiments, the energy storage system comprises a cabinet body and at least one electric cell group as described above.

[0110] The electric cell group is arranged in the cabinet body.

[0111] In some embodiments, the energy storage system can comprise one or more electric cell groups and a power conversion device, and the power conversion device is arranged between the power generation device and the electric cell group. The power generation device is used to generate electric energy, and the electric energy generated by the power generation device can be stored in the electric cell group through the power conversion device. As an example, the power generation device can be a solar panel, a water power generation device, a fire power generation device, a wind power generation device, and the like. The specific type of the power generation device is not limited in the present application.

[0112] ​​The energy storage system provided in the embodiment of the present application increases the contact area and friction between the insert 130 and the base body 110 through the arrangement of the above-mentioned battery cell group, significantly improves the axial pull-out resistance of the insert 130, and effectively reduces the risk of loosening and falling off of the insert 130 due to long-term use or external factors, thereby enhancing the bonding force between the insert 130 and the base body 110, and improving the long-term stability and reliability of the assembly of the lead-out bus 300 and the external bus 400 on the base 100, thereby improving the performance and safety of the battery cell group.

[0113] The present application also provides an electrical device.

[0114] In some embodiments, an electrical device includes: at least one battery cell group as described above.

[0115] The battery cell pack is used to provide electrical energy.

[0116] Electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery-powered vehicles, electric cars, ships, and spacecraft. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft.

[0117] The electrical device provided in the embodiment of the present application increases the contact area and friction between the insert 130 and the base body 110 through the arrangement of the above-mentioned battery cell group, significantly improves the axial pull-out resistance of the insert 130, and effectively reduces the risk of loosening and falling off of the insert 130 due to long-term use or external factors, thereby enhancing the bonding force between the insert 130 and the base body 110, and improving the long-term stability and reliability of the assembly of the lead-out bus 300 and the external bus 400 on the base 100, thereby improving the performance and safety of the battery cell group.

[0118] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0119] In the description of the present application, it should be understood that 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0120] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0121] In the description of this application, “plurality” means two or more.

[0122] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0123] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0124] Other structures of ... according to the embodiments of the present application, such as ... and ..., and operations are known to ordinary technicians in this field and will not be described in detail here.

[0125] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0126] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A base, applied to a battery pack, characterized in that: include: A base body having a mounting surface for mounting the lead-out busbar and the external busbar of the battery cell group; A fastener, used to connect the lead-out busbar and the external busbar of the battery cell group; An insert is embedded in the seat and connected to the fastener; wherein the insert has at least two locations with different sizes along the embedding direction.

2. The base according to claim 1, wherein: The insert includes a plurality of first segments and a plurality of second segments staggered along an embedding direction, and a cross-sectional area of ​​the first segment is larger than a cross-sectional area of ​​the second segment.

3. The base according to claim 2, characterized in that An outer contour of an orthographic projection of at least one of the first segment and the second segment along a connection direction between the fastener and the insert is a polygon.

4. The base according to claim 3, characterized in that The outer contour of the orthographic projection of the first section along the connection direction of the fastener and the insert is a polygon, and the outer contour of the orthographic projection of the second section along the connection direction of the fastener and the insert is a circle.

5. The base according to any one of claims 1 to 4, characterized in that The base is used to be mounted on the end plate of the battery cell group; wherein the base body includes: a support platform, the support platform forming the mounting surface; an assembly platform connected to a side of the support platform facing away from the mounting surface; A positioning member is connected to the assembly table and is used for positioning and cooperating with the end plate.

6. The base according to claim 5, characterized in that The positioning member has a guiding inclined surface, and the guiding inclined surface is arranged to be inclined toward the assembly platform along the embedding direction.

7. The base according to claim 5, characterized in that Parts of the inserts are embedded in both the support platform and the assembly platform.

8. The base according to any one of claims 1 to 4, characterized in that: An insulating baffle is provided at the edge of the installation surface.

9. A battery cell pack, characterized in that: include: A plurality of battery cells, wherein the poles of the battery cells are located on the sides of the battery cells; end plates, the end plates being arranged in pairs at both ends of the plurality of battery cells along a stacking direction; An output busbar, through which the plurality of battery cells are electrically connected; The base according to any one of claims 1 to 8, wherein the base is provided on a side of the end plate; The external busbar is connected to the mounting surface of the base through the fasteners of the base.

10. An energy storage system, characterized in that: include: Cabinet; At least one battery cell group according to claim 9, wherein the battery cell group is arranged in the cabinet.

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