Battery cell, battery pack and electric equipment

Abstract

The embodiment of the invention provides a battery cell, a battery pack and electric equipment. The battery cell comprises a shell, a pole core, a top cover and a side cover, the shell is provided with a cavity for containing the pole core, a first opening and a second opening, the first opening and the second opening are communicated with the cavity, the first opening is formed in the top of the cavity, and the second opening is formed in the side portion of the cavity and is opposite to a pole lug of the pole core. The top cover is arranged on the first opening and is fixedly connected with the shell, and the side cover is arranged on the second opening, extends to the first opening, is fixedly connected with the top cover and the shell and is electrically connected with the tab, so that the laterally arranged tab is externally connected through the side cover at the top, and a busbar and the like can be mounted after the battery cell is placed in the box body; and the difficulty of putting the battery cells into the box is reduced, the battery cell grouping process is simplified, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to new energy, and in particular to a battery cell, a battery pack and electrical equipment. Background Art

[0002] With the development of science and technology and the continuous increase in energy demand, new energy storage devices have become a hot topic in the field of new energy. Power battery packs, especially lithium-ion battery packs, are widely used in information technology, electric vehicles, aerospace and other fields due to their advantages such as high cycle life, low mass and no memory response. Battery packs usually include a box body and multiple battery cells arranged in the box body. However, it is difficult to put existing battery cells into the box body. Summary of the invention

[0003] The embodiments of the present application provide a battery cell, a battery pack and an electrical device, so as to reduce the difficulty of putting the battery cell into a box.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, including:

[0005] A shell, the shell having a cavity, and a first opening and a second opening communicating with the cavity, the first opening being located at the top of the cavity, and the second opening being located at the side of the cavity;

[0006] A pole core, the pole core is disposed in the cavity and has a pole ear opposite to the second opening;

[0007] A top cover, which is disposed on the first opening and is fixedly connected to the shell;

[0008] A side cover is disposed on the second opening and extends to the first opening, is fixedly connected to the top cover and the shell, and is electrically connected to the tab.

[0009] In a possible implementation, the side cover includes:

[0010] A first cover plate, the first cover plate comprising a first split body and a second split body connected to each other, the first split body being arranged at the first opening, and the second split body being arranged at the second opening;

[0011] A pole, the pole being arranged on a side of the first split body and the second split body away from the pole core;

[0012] A connecting member, the connecting member fixedly connects the second split body and the pole, and electrically connects the pole and the pole lug;

[0013] An insulating member is arranged between the pole and the first cover plate, and between the connecting member and the first cover plate.

[0014] In a possible implementation manner, the first cover plate and the pole are both L-shaped.

[0015] In a possible implementation manner, the connecting member includes a rivet post, the rivet post is welded to the pole lug, and the first cover plate and the pole are riveted together;

[0016] And / or, the insulating member includes a pole insulating member, the pole insulating member is arranged between the pole and the first cover plate, the pole insulating member has a receiving groove on a side facing the pole, and the pole is arranged in the receiving groove.

[0017] In a possible implementation manner, the side cover further includes a bracket, which is disposed on a side of the first split body adjacent to the pole core and is fixedly connected to the first split body via the connecting member.

[0018] In a possible implementation manner, the battery cell further includes an insulating cover, which is disposed on a side of the side cover away from the pole core and opposite to the second opening.

[0019] In a possible implementation manner, a first groove is formed on a surface of the insulation cover facing the pole core, and the first groove extends from one end of the insulation cover adjacent to the top cover to a surface of the insulation cover adjacent to the top cover;

[0020] The insulating cover is located on the second split body, and the first groove cover is arranged on the pole.

[0021] In a possible implementation manner, the top cover includes a second cover plate, and a protective plate disposed between the pole core and the second cover plate;

[0022] A first limiting portion is provided at one end of the second cover plate facing the side cover, and a gap is formed between the first limiting portion and the protective plate;

[0023] A second limiting portion is disposed at one end of the side cover facing the top cover, and the second limiting portion is located in the gap.

[0024] In a possible implementation manner, a protrusion is further provided at one end of the first limiting portion facing the side cover, and a notch is further provided at one end of the side cover facing the top cover, and the protrusion extends into the notch.

[0025] In a second aspect, an embodiment of the present application provides a battery pack, comprising: a bus bar, a low voltage collection component, and a battery cell as described above;

[0026] The busbar is arranged on the top of the battery cell and is electrically connected to the side cover of the battery cell, and the low-voltage collection component is arranged on the top of the battery cell and is electrically connected to the busbar.

[0027] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the battery pack as described above.

[0028] In the battery cell, battery pack and electrical equipment provided in the embodiment of the present application, the battery cell includes a shell, a pole core, a top cover and a side cover. The shell has a cavity for accommodating the pole core, and a first opening and a second opening connected to the cavity. The first opening is located at the top of the cavity, and the second opening is located at the side of the cavity and is opposite to the pole lug of the pole core. The top cover is arranged on the first opening and is fixedly connected to the shell. The side cover is arranged on the second opening and extends to the first opening. It is fixedly connected to both the top cover and the shell, and is electrically connected to the pole lug, so that the pole lug arranged laterally can be externally connected through the side cover on the top. The busbar and the like can be installed after the battery cell is placed in the box, which reduces the difficulty of putting the battery cell into the box, simplifies the battery cell grouping process, and reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0030] Figure 1 An overall schematic diagram of the battery pack provided for this application;

[0031] Figure 2 A partial schematic diagram of the battery pack provided for this application;

[0032] Figure 3 An exploded view of the battery cell provided for this application;

[0033] Figure 4 An exploded view of the side cover provided for this application;

[0034] Figure 5 A partial schematic diagram of the battery cell provided in this application.

[0035] Description of reference numerals:

[0036] 1-battery cell; 2-box;

[0037] 3-bus; 4-low voltage collection component;

[0038] 10-polar core; 11-polar ear;

[0039] 20-housing; 21-first side plate;

[0040] 22-second side plate; 23-bottom plate;

[0041] 30-top cover; 31-second cover plate;

[0042] 32-protection plate; 40-side cover;

[0043] 41-first cover plate; 42-pole insulating member;

[0044] 43-pole; 44-connector;

[0045] 45- bracket; 46- first split body;

[0046] 47-second split body; 48-accommodating groove;

[0047] 49-through hole; 50-insulating cover;

[0048] 60-pressure relief valve; 70-collection terminal. DETAILED DESCRIPTION

[0049] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0050] In the related art, it is difficult to pack battery cells. The reason is that the battery cells usually have polarity on both sides, that is, the pole core is located on the side of the battery cell to improve volume utilization and cycle performance. However, such battery cells usually need to be welded to the busbars on the outside to form an integral body before being loaded into the box, which increases the difficulty of packing multiple battery cells as a whole. In addition, battery cells are usually long, which further increases the difficulty of packing multiple battery cells as a whole. At the same time, the pole core is located on the side of the battery cell, and it is necessary to install busbars, low-voltage collection components and other components on the side, which makes the process difficult and the production cost high.

[0051] The battery cell provided in the present application is provided with a side cover on the side of the shell, and the side cover is extended to the top of the shell, and the side cover is used to electrically connect the pole ear, so that the laterally arranged pole ear can be externally connected through the side cover on the top, and the bus and the like can be installed after the battery cell is placed in the box, which reduces the difficulty of putting the battery cell into the box, simplifies the battery cell grouping process, and reduces the production cost.

[0052] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0053] The embodiment of the present application provides an electric device, which may include an electric bicycle, an electric car, an electric ship, etc. The electric device includes a battery pack, which is used to store and provide electrical energy. Exemplarily, the battery pack may be a lithium-ion battery pack, which has a higher single cell specific energy and a lower battery internal resistance, and has a better endurance energy.

[0054] See also Figure 1 and Figure 2 The battery pack includes at least one battery cell 1, and the battery pack may include multiple battery cells 1 to improve the voltage and capacity of the battery pack to meet different power requirements. The battery cells 1 are integrated into battery modules and then formed into a battery pack; the battery cells 1 can also be directly integrated into a battery pack, that is, the battery pack is a module-free battery pack (Cell to Pack, CTP).

[0055] The battery pack also includes a box body 2, and a bus 3, a low-voltage collection component 4, a battery management system (BMS), etc. arranged in the box body 2. Among them, the box body 2 is used to accommodate and protect the structure therein. The bus 3 is used to connect the battery cells 1, for example, to connect the battery cells 1 in series, in parallel, or in mixed connection. The low-voltage collection component 4 is used to collect information such as the voltage and temperature of the battery cell 1, and transmit the information to the battery management system. The battery management system is used for monitoring and control. By monitoring the status of the battery cell 1, it controls the charging and discharging process of the entire battery pack to ensure the safety and stability of the battery pack.

[0056] In the embodiment of the present application, the battery pack can be assembled by the following process: the battery cells 1 are arranged into a pile and then loaded into the box body 2, then the busbar 3 is installed on the battery cells 1, and finally the low-voltage collection component 4 is installed on the busbar 3 and the battery cells 1. By installing the busbar 3 and the low-voltage collection component 4 on the top of the battery cell 1, the battery cell 1 can be boxed first, so as to reduce the difficulty of putting the battery cell 1 into the box, simplify the assembly process, and reduce the production cost.

[0057] See also Figure 1 and Figure 2 , multiple battery cells 1 are arranged along a first direction and along a second direction, and the first direction intersects with the second direction, for example, perpendicularly. The first direction is the length direction of the battery pack, such as Figure 1 The second direction is the width direction of the battery pack, as shown in the X direction. Figure 1 In the Y direction shown, the thickness direction of the battery pack is the third direction, wherein the third direction, the second direction and the first direction are perpendicular to each other.

[0058] In some possible examples, the battery cell 1 may be square as a whole, such as a cuboid or a cube, the first direction is also the thickness direction of the battery cell 1, the second direction is also the length direction of the battery cell 1, and the third direction is also the height direction of the battery cell 1. The two opposite faces of the battery cell 1 along the first direction are large faces, the two opposite faces of the battery cell 1 along the second direction are side faces, and the two opposite faces of the battery cell 1 along the third direction are the top face and the bottom face, respectively, wherein the two side faces, the top face and the bottom face are all narrow faces.

[0059] See also Figures 3 to 5 The battery cell 1 includes a shell 20, a pole core 10, a top cover 30 and a side cover 40, wherein the battery cell 1 is square and the shell 20 is a square shell accordingly. The shell 20 has a cavity, and a first opening and a second opening, the first opening and the second opening are connected, and both are connected to the cavity. The first opening is located at the top of the cavity, and the second opening is located at the side of the shell 20, so that both sides and the top of the shell 20 are in a non-closed form, that is, the shell 20 forms a three-sided non-closed structure, which reduces the process difficulty of placing the pole core 10 into the shell 20, improves the production efficiency of the battery cell 1, and at the same time facilitates electrical connection at the top of the battery cell 1, which facilitates the installation and integration of the battery cell 1.

[0060] In some possible implementations, the housing 20 includes a first side plate 21, a second side plate 22, and a bottom plate 23 connecting the first side plate 21 and the second side plate 22. The first side plate 21 and the second side plate 22 are arranged opposite to each other, for example, the first side plate 21 and the second side plate 22 are arranged opposite to each other along the thickness direction (i.e., the first direction) of the battery cell 1. One end of the bottom plate 23 is connected to one end of the first side plate 21, and the other end of the bottom plate 23 is connected to one end of the second side plate 22, and the first side plate 21, the second side plate 22 and the bottom are U-shaped.

[0061] The first side plate 21 and the second side plate 22 form a first opening at one end away from the bottom plate 23, and the first side plate 21, the second side plate 22 and the bottom plate 23 respectively enclose the opposite ends along the length direction of the battery cell 1 to form a second opening. The first side plate 21, the second side plate 22 and the bottom plate 23 are all flat plates, and the three can be an integral structure. Along the length direction of the battery cell 1, the first side plate 21, the second side plate 22 and the bottom plate 23 are aligned at both ends.

[0062] The pole core 10 is arranged in the cavity and has a pole ear 11 opposite to the second opening, that is, the pole core 10 is of side-out polarity. Specifically, there are two pole ears 11, which are respectively located at opposite ends of the pole core 10 along the length direction of the battery cell 1 and respectively opposite to a second opening, that is, the two pole ears 11 are respectively exposed in the two second openings. The two pole ears 11 are respectively a positive pole ear 11 and a negative pole ear 11, and accordingly, the battery cell 1 is of a two-side-out polarity form.

[0063] The electrode core 10 also includes a stacked positive electrode sheet, a negative electrode sheet and a separator, and works by moving metal ions between the positive electrode sheet and the negative electrode sheet. Among them, the positive electrode sheet includes a positive electrode collector and a positive electrode active layer, the positive electrode active layer is coated on the surface of the positive electrode collector, and the positive electrode sheet is electrically connected to the positive electrode ear. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, and the negative electrode sheet is electrically connected to the negative electrode ear. The separator is located between the positive electrode sheet and the negative electrode sheet, and is used to isolate the positive electrode sheet and the negative electrode sheet.

[0064] Exemplarily, the battery cell 1 is a lithium-ion battery cell, the material of the positive electrode current collector includes aluminum, and the positive electrode active material includes lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The material of the negative electrode current collector includes copper, and the material of the negative electrode active material includes carbon or silicon, etc. The material of the separator includes polypropylene, polyethylene, etc.

[0065] Continue reading Figures 3 to 5 The top cover 30 is arranged on the first opening and is fixedly connected to the housing 20 to cover at least part of the first opening. The top cover 30 includes a second cover plate 31 and a protective plate 32. The second cover plate 31 is fixedly connected to the housing 20 and the side plate, for example, by welding. The protective plate 32 is arranged between the pole core 10 and the second cover plate 31 to isolate the pole core 10 and the second cover plate 31 and play the role of insulation protection.

[0066] Exemplarily, the protective plate 32 covers the entire top surface of the pole core 10, that is, the protective plate 32 corresponds to the entire area of ​​the pole core 10. For example, the end of the protective plate 32 adjacent to the second opening extends beyond the end of the second cover plate 31, so that along the length direction of the battery cell 1, the size of the protective plate 32 is larger than the size of the second cover plate 31.

[0067] A first limiting portion is provided at one end of the second cover plate 31 facing the side cover 40, and the first limiting portion is spaced apart from the protective plate 32 to form a gap. The first limiting portion and the second cover plate 31 may be an integral structure, and the surface of the first limiting portion away from the protective plate 32 may be flush with the surface of the second cover plate 31 away from the protective plate 32, and along the thickness direction of the battery cell 1, the two ends of the first limiting portion are respectively aligned with the corresponding ends of the second cover plate 31, so that the gap forms a through groove extending along the thickness direction of the battery cell 1.

[0068] The side cover 40 is provided with a second limit portion at one end facing the top cover 30, and the second limit portion is located in the gap. Figure 5 As shown at A in the middle, the first limiting portion overlaps the second limiting portion, which can limit the side cover 40 and facilitate the assembly of the side cover 40, the top cover 30 and the shell 20.

[0069] Furthermore, a protrusion is provided at one end of the first limit portion facing the side cover 40, and the protrusion and the first limit portion can be an integral structure. Along the thickness direction of the battery cell 1, the protrusion can be located at one end of the first limit portion, and the protrusion can be a sharp corner. A notch is also provided at one end of the side cover 40 facing the top cover 30, such as Figure 5 As shown at B in the middle, the protrusion extends into the notch to limit the side cover 40 and the top cover 30 along the thickness direction of the battery cell 1.

[0070] Continue reading Figures 3 to 5 , the side cover 40 is arranged on the second opening, for example, a side cover 40 is arranged corresponding to each second opening. The side cover 40 also extends to the first opening, and is fixedly connected to the top cover 30 and the shell 20, for example, by welding. The side cover 40, the top cover 30 and the shell 20 form a closed structure to close the pole core 10. At the same time, the top cover 30 is connected to the shell 20 and the side cover 40 by splicing, for example, by welding with the shell 20 and the side cover 40, so that the battery cell 1 can withstand greater pressure in the large and narrow directions without deformation.

[0071] The side cover 40 is also electrically connected to the pole lug 11 to realize the external connection of the pole core 10. For example, the two side covers 40 are respectively connected to a pole lug 11 to lead out the two pole lugs 11 (positive and negative pole lugs) of the pole core 10. Among them, on each second opening, the part of the side cover 40 opposite to the second opening is electrically connected to the corresponding pole lug 11, and the part of the side cover 40 opposite to the first opening is electrically connected to the structural member (such as the bus 3). The pole lug 11 arranged laterally is led out through the top for external connection, so that the battery cell 1 with polarity output on both sides can be installed with the bus 3 and other structural members on its top, and the bus 3 and other members can be installed after the battery cell 1 is placed in the box 2, which reduces the difficulty of entering the box, simplifies the battery cell 1 grouping process, and reduces the production cost.

[0072] For some possible examples, see Figure 4 The side cover 40 includes a first cover plate 41, a pole 43, a connector 44 and an insulating member. The first cover plate 41 is connected to the top cover 30 and the shell 20, for example, the first cover plate 41, the second cover plate 31 and the shell 20 are welded together. The pole 43 is electrically connected to the busbar 3 and to the pole lug 11 to externally connect the pole lug 11. The connector 44 fixes the various structures of the side cover 40 and electrically connects the pole 43 to the pole lug 11. The insulating member is arranged between the pole 43 and the first cover plate 41, and between the connector 44 and the first cover plate 41, so as to insulate and isolate the first cover plate 41 from the pole 43 and the connector 44.

[0073] Specifically, the first cover plate 41 includes a first split body 46 and a second split body 47 connected to each other, and the ends of the first split body 46 and the second split body 47 are connected, so that the first cover plate 41 is L-shaped. For example, one end of the first split body 46 is connected to one end of the second split body 47, and the first split body 46 and the second split body 47 can be an integral structure. The first split body 46 is arranged at the first opening, and is overlapped and welded with the top cover 30, and is welded with the shell 20. The second split body 47 is arranged at the second opening, and is welded with the shell 20.

[0074] The pole 43 is arranged on the side of the first cover plate 41 away from the pole core 10, and is located on the side of the first split body 46 away from the pole core 10, and extends to the side of the second split body 47 away from the pole core 10, so that the pole 43 can extend to the top narrow surface of the battery cell 1. The pole 43 can be L-shaped, and the part of the pole 43 opposite to the second split body 47 is connected to the pole 43, and the part of the pole 43 opposite to the first part is connected to the bus 3.

[0075] The insulating member includes a pole insulating member 42, which is disposed between the pole 43 and the first cover plate 41, and is located on the first split body 46 and extends to the second split body 47, and is L-shaped. The pole insulating member 42 has a receiving groove 48 at one end facing the pole 43, and the pole 43 is disposed in the receiving groove 48, which, on the one hand, limits the position of the pole 43, and on the other hand, surrounds at least part of the side of the pole 43, thereby providing insulation protection for the side of the pole 43.

[0076] The connector 44 is fixedly connected to the second split 47 and the pole 43, and electrically connects the pole 43 and the pole lug 11. Exemplarily, the connector 44 includes a rivet post, and the material of the rivet post includes a conductive material, such as metal. The rivet post is welded to the pole lug 11, and the first cover plate 41 and the pole 43 are riveted. Among them, the first cover plate 41, the insulating member and the pole 43 are correspondingly provided with a through hole 49, and the through hole 49 is located on the second split 47 of the first cover plate 41. The rivet post is located in the through hole 49, and the first cover plate 41, the insulating member and the pole 43 are crimped and fixed at both ends.

[0077] Specifically, the rivet column includes a first column segment, a second column segment and a third column segment connected in sequence, and the first column segment is located on a side of the first cover plate 41 adjacent to the pole core 10. The first column segment can be a rectangular column or a rounded rectangular column, and the second column segment and the third column segment can be a cylinder or an elliptical column. One end of the first column segment is welded to the pole core 10, and the other end of the first column segment abuts against the surface of the first cover plate 41 facing the pole core 10.

[0078] The second column section is arranged in the through hole 49 of the first cover plate 41, and the third column section abuts against the surface of the first cover plate 41 away from the pole core 10, and the third column section is formed during the riveting process. Specifically, a second groove is arranged on the surface of the pole 43 away from the pole core 10, and the third column section is located in the second groove and abuts against the bottom of the second groove.

[0079] In order to achieve insulation isolation between the first cover plate 41 and the connector 44 , in some possible implementations, the insulating member further includes a sealing ring, which is sleeved on the connector 44 and abuts against the inner wall of the through hole 49 of the first cover plate 41 .

[0080] In some other possible implementations, the surface of the pole insulator 42 facing the first cover plate 41 is further provided with an annular boss, which surrounds the through hole 49 of the pole insulator 42 and extends into the through hole 49 of the first cover plate 41. The connector 44 passes through the annular boss, so that the annular boss is located between the connector 44 and the first cover plate 41. The inner circumferential surface of the annular boss may be aligned with the inner circumferential surface of the through hole 49 of the pole insulator 42.

[0081] Continue reading Figures 3 to 5 The side cover 40 further includes a bracket 45, which is disposed on a side of the first split body 46 adjacent to the pole core 10 and is fixedly connected to the first split body 46 through a connector 44. The bracket 45 insulates and isolates the first cover plate 41 and the pole core 10, and defines the position of the pole core 10. The bracket 45 is specifically disposed on a side of the first split body 46 adjacent to the pole core 10, and the bracket 45 contacts the protective plate 32 to surround the surface of the pole core 10 facing the first opening and the second opening to ensure the isolation effect.

[0082] The bracket 45 is also provided with a through hole 49 for the rivet stud to pass through. The two ends of the rivet stud respectively abut against the surfaces of the bracket 45 and the pole 43 that are away from each other, so as to fix the bracket 45, the first cover plate 41, the insulating member and the pole 43 together, for example, by crimping, and realize the electrical connection between the pole core 10 and the pole 43 by contacting with the pole core 10 and the pole 43.

[0083] Continue reading Figure 3 and Figure 5 The battery cell 1 further includes an insulating cover 50, which is disposed on a side of the side cover 40 away from the pole core 10 and opposite to the second opening. The insulating cover 50 can cover the conductive part of the side of the side cover 40, so that the side cover 40 is externally connected only through the conductive part above, thereby realizing connection at the top of the battery cell 1.

[0084] The surface of the insulating cover 50 facing the pole core 10 is formed with a first groove, for example, the insulating cover 50 is recessed in a direction away from the pole core 10 to form the first groove, so that the thickness of the insulating cover 50 is relatively uniform. The first groove extends from one end of the insulating cover 50 adjacent to the top cover 30 to the surface of the insulating cover 50 adjacent to the top cover 30 to match the pole 43. The insulating cover 50 is located on the second split body 47, for example, the insulating cover 50 is pasted on the corresponding second split body 47. The first groove cover is provided on the pole 43 to cover the side of the pole 43, so that the pole 43 opposite to the first opening is exposed, that is, the top of the pole 43 is exposed, so as to be connected with the bus 3 and the low-voltage collection assembly 4.

[0085] Specifically, Figure 1 and Figure 5 As shown, the busbar 3 is located on the top surface of the battery cell 1, which is located on the pole 43 opposite to the first opening, and the busbar 3 is welded together with the contacting pole 43 by penetration welding. For example, the battery cells 1 are divided into multiple groups, and the battery cells 1 in the same group are adjacent, and a busbar 3 connects the battery cells 1 in the same group. Among them, each group corresponds to two busbars 3, so as to respectively connect the pole 43 connected to the positive pole ear and the pole 43 connected to the negative pole ear.

[0086] In some possible examples, the busbar 3 is a flat plate, which is laid flat on the corresponding battery cell 1. In other possible examples, the busbar 3 may also extend to the side of the corresponding battery cell 1, that is, the busbar 3 is L-shaped. By setting a portion of the busbar 3 on the side of the battery cell 1, the width of the busbar 3 on the top surface of the battery cell 1 is reduced. The busbar 3 can be an aluminum busbar, and is isolated from the second opening relative to the pole 43 by the insulating cover 50. The low-voltage collection component 4 is set on the top surface of the battery cell 1 and connected to the busbar 3. For example, the collection terminal 70 of the low-voltage collection component 4 extends above the busbar 3 and is welded to the busbar 3.

[0087] See also Figure 1 and Figure 4 The battery cell 1 further includes at least one pressure relief valve 60 (i.e., explosion-proof valve) to improve the safety of the battery cell 1 and prevent the battery cell 1 from exploding during charging and discharging or under abnormal conditions. The pressure relief valve 60 is disposed on the side cover 40 or the top cover 30. For example, one pressure relief valve 60 is disposed on each side cover 40.

[0088] The battery cell 1 in the embodiment of the present application includes a shell 20, a pole core 10, a top cover 30 and a side cover 40. The shell 20 has a cavity for accommodating the pole core 10, and a first opening and a second opening connected to the cavity. The first opening is located at the top of the cavity, and the second opening is located at the side of the cavity and is opposite to the pole lug 11 of the pole core 10. The top cover 30 is arranged on the first opening and is fixedly connected to the shell 20. The side cover 40 is arranged on the second opening and extends to the first opening. It is fixedly connected to both the top cover 30 and the shell 20, and is electrically connected to the pole lug 11, so that the side-arranged pole lug 11 is externally connected through the top side cover 40. The busbar 3 and the like can be installed after the battery cell 1 is placed in the box 2, which reduces the difficulty of putting the battery cell 1 into the box, simplifies the battery cell 1 grouping process, and reduces the production cost.

[0089] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A battery cell, characterized in that: include: A shell, the shell having a cavity, and a first opening and a second opening communicating with the cavity, the first opening being located at the top of the cavity, and the second opening being located at the side of the cavity; A pole core, the pole core is disposed in the cavity and has a pole ear opposite to the second opening; A top cover, which is disposed on the first opening and is fixedly connected to the shell; A side cover is disposed on the second opening and extends to the first opening, is fixedly connected to the top cover and the shell, and is electrically connected to the tab.

2. The battery cell according to claim 1, characterized in that: The side cover comprises: A first cover plate, the first cover plate comprising a first split body and a second split body connected to each other, the first split body being arranged at the first opening, and the second split body being arranged at the second opening; A pole, the pole being arranged on a side of the first split body and the second split body away from the pole core; A connecting member, the connecting member fixedly connects the second split body and the pole, and electrically connects the pole and the pole lug; An insulating member is arranged between the pole and the first cover plate, and between the connecting member and the first cover plate.

3. The battery cell according to claim 2, characterized in that: The first cover plate and the pole are both L-shaped.

4. The battery cell according to claim 2, characterized in that: The connecting member includes a rivet post, the rivet post is welded to the pole lug, and the first cover plate and the pole are riveted together; And / or, the insulating member includes a pole insulating member, the pole insulating member is arranged between the pole and the first cover plate, the pole insulating member has a receiving groove on a side facing the pole, and the pole is arranged in the receiving groove.

5. The battery cell according to any one of claims 2 to 4, characterized in that: The side cover also includes a bracket, which is arranged on a side of the first split body adjacent to the pole core and is fixedly connected to the first split body through the connecting piece.

6. The battery cell according to any one of claims 2 to 4, characterized in that: The battery core further includes an insulating cover, which is arranged on a side of the side cover away from the pole core and opposite to the second opening.

7. The battery cell according to claim 6, characterized in that: A first groove is formed on the surface of the insulation cover facing the pole core, and the first groove extends from one end of the insulation cover adjacent to the top cover to the surface of the insulation cover adjacent to the top cover; The insulating cover is located on the second split body, and the first groove cover is arranged on the pole.

8. The battery cell according to any one of claims 1 to 4, characterized in that: The top cover includes a second cover plate, and a protective plate arranged between the pole core and the second cover plate; A first limiting portion is provided at one end of the second cover plate facing the side cover, and a gap is formed between the first limiting portion and the protective plate; A second limiting portion is disposed at one end of the side cover facing the top cover, and the second limiting portion is located in the gap.

9. The battery cell according to claim 8, characterized in that: A protrusion is further provided on one end of the first limiting portion facing the side cover, and a notch is further provided on one end of the side cover facing the top cover, and the protrusion extends into the notch.

10. A battery pack, characterized in that: include: A busbar, a low voltage collection component, and a battery cell as claimed in any one of claims 1 to 9; The busbar is arranged on the top of the battery cell and is electrically connected to the side cover of the battery cell, and the low-voltage collection component is arranged on the top of the battery cell and is electrically connected to the busbar.

11. An electrical device, characterized in that: A battery pack comprising the battery pack described in claim 10.

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