Cell, battery, and electrical apparatus

Abstract

The present application relates to the technical field of batteries, and provides a cell, a battery, and an electrical apparatus. The provided cell comprises a casing, a post, and an injection molded member; the casing is provided with a post mounting portion, the post mounting portion is provided with a post mounting hole, at least part of the post passes through the post mounting hole, and there is a gap between a part located in the post mounting hole and the post mounting hole; the injection molded member is disposed around the post and is at least partly located in the gap, so as to connect the post mounting portion and the post; the injection molded member is provided with a glue converging surface, and the position at which a side wall of the post intersects the glue converging surface is a glue converging position; along the circumferential direction of the side wall of the post, the side wall of the post has a planar structure on both sides of the glue converging position; and the included angle between the two planar structures located on both sides of the glue converging position is greater than 120 degrees and less than or equal to 180 degrees. The described solution can solve the problem in the existing technology of low structural strength at the position of a glue converging surface of an injection molded member.

Description

Single battery, battery and electric device

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202422243260.3, filed on September 12, 2024, and entitled "Single battery, battery and electric device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to a single battery, a battery and an electric device. BACKGROUND

[0004] With the rapid development of the new energy industry, the performance requirements of single batteries are also becoming higher and higher. The pole is an important component of the single battery, and the structural strength of the injection molding part for connecting the pole and the single battery shell has an important influence on the stability of the pole, thereby having an important influence on the safety performance of the single battery.

[0005] The injection molding part is formed by injection molding. In the process of injection molding the injection molding part, the plastic is injected into the mold, and then the plastic is divided into two streams and flows around the pole in opposite directions, finally contacts and converges to form a complete injection molding part. In the prior art, the two streams of plastic flow along the pole side wall arranged at 90° before converging. When the two streams of plastic converge, a flow in a third direction (different from the flow direction of the two streams of plastic) is generated, and the flow amount is large, which results in low strength of the glue converging surface position of the injection molding part, and affects the safety performance of the single battery. SUMMARY

[0006] Therefore, the present application provides a single battery, a battery and an electric device to solve the problem of low structural strength of the glue converging surface position of the injection molding part in the prior art.

[0007] To achieve the above purpose, the present application provides the following technical solutions:

[0008] A single battery comprises:

[0009] A housing having a pole mounting portion, the pole mounting portion being provided with a pole mounting hole;

[0010] A pole at least partially penetrating the pole mounting hole and having a gap between the portion located in the pole mounting hole and the pole mounting hole;

[0011] An injection molding part arranged around the pole and at least partially located in the gap to connect the pole mounting portion and the pole, the injection molding part having a glue converging surface;

[0012] The position where the side wall of the pole column intersects with the glue collecting surface is a glue collecting position, and the side wall of the pole column has a planar structure on both sides of the glue collecting position along the circumference of the side wall of the pole column, and the included angle between the two planar structures on both sides of the glue collecting position is greater than 120 degrees and less than or equal to 180 degrees.

[0013] In some embodiments, the included angle between the two planar structures on both sides of the glue collecting position is 180 degrees, and the two planar structures jointly form a guide plane.

[0014] In some embodiments, the guide plane has a first symmetry line parallel to the center line of the pole column, and the first symmetry line is located at the glue collecting position.

[0015] In some embodiments, the injection molding part has an injection mark, the position of the injection mark of the injection molding part is an injection position, and the position corresponding to the injection position of the side wall of the pole column is a plastic starting flow position.

[0016] The pole column is a symmetrical structure, and the plastic starting flow position and the glue collecting position are both located on the symmetry plane of the pole column.

[0017] In some embodiments, the number of injection marks is one, and the center of the injection mark is located on the plane where the glue collecting surface is located.

[0018] In some embodiments, along the circumference of the side wall of the pole column, the side wall of the pole column further includes an arc-shaped area distributed on both sides of the guide plane.

[0019] The guide plane is smoothly connected with the arc-shaped area.

[0020] In some embodiments, the side wall of the pole column is provided with at least one recessed part, the inner wall of the injection molding part is provided with at least one protruding part, one protruding part is matched with one recessed part, and the protruding part extends into the recessed part.

[0021] The bottom surface of the recessed part in the recessed direction is a plane, and the bottom surface of at least one recessed part forms the guide plane.

[0022] In some embodiments, the side wall of the pole column includes an arc-shaped area, the arc-shaped area and the recessed part are distributed along the circumference of the side wall of the pole column, the bottom surface of the recessed part has two first side edges arranged opposite to each other along the circumference of the side wall of the pole column, and the two first side edges of the bottom surface of the recessed part are formed on the arc-shaped area adjacent to the recessed part.

[0023] In some embodiments, the number of recessed parts is four, and the arc-shaped area and the recessed part are alternately distributed along the circumference of the side wall of the pole column.

[0024] In some embodiments, the height of the recess is greater than 0.3mm along the direction of the center line of the pole.

[0025] In some embodiments, the depth of the recess is 0.5mm-3mm along the direction of the recess.

[0026] In some embodiments, the protrusion forming the partial glue surface has a second symmetry line parallel to the center line of the injection molding part, the second symmetry line and the center line of the injection molding part form a first plane;

[0027] The injection molding part has a glue mark, the center of the glue mark is located on the first plane.

[0028] In some embodiments, the pole includes a first part and a second part distributed along the direction of the center line, the cross-sectional area of the first part is smaller than that of the second part, the first part passes through the pole mounting hole, the recess is arranged on the first part, and the injection molding part is arranged around the first part; the pole mounting part includes a mounting area around the pole mounting hole, the side wall of the first part is further sleeved with a sealing ring, and the two opposite surfaces of the sealing ring abut against the mounting area and the second part, respectively.

[0029] In some embodiments, the minimum distance between the recess and the second part is a first distance along the direction of the center line of the pole, and the first distance is greater than the thickness of the sealing ring.

[0030] In some embodiments, the injection molding part extends to the surface of the pole mounting part to form a square column structure, and the injection molding part has an annular inner wall around the pole.

[0031] The injection molding part has a plurality of corners, and the injection molding part has a glue mark, and the glue mark is located at the corner.

[0032] A battery includes the single battery described above.

[0033] A power consumption device includes the single battery described above or the battery described above.

[0034] In the embodiment of the present application, the side wall of the pole post has a guiding effect on the flow of plastic during the injection molding process, the two sides of the glue collecting position of the pole post have a plane structure, the plane structure on both sides of the glue collecting position can guide the flow of plastic about to be collected, the angle between the plane structures on both sides of the glue collecting position is greater than 120 degrees and less than or equal to 180 degrees, which can reduce the plastic flow amount in the third direction generated when two streams of plastic are collected at the glue collecting position compared with 90 degrees, thereby improving the structural strength of the glue collecting surface of the injection molded part. Therefore, the present application can solve the problem of low structural strength of the glue collecting surface position of the injection molded part in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0036] FIG. 1 is an exploded view of part of a single battery according to an embodiment of the present application;

[0037] FIG. 2 is a structural schematic view of an injection molded part and a pole post according to an embodiment of the present application;

[0038] FIG. 3 is a top view of an injection molded part according to an embodiment of the present application;

[0039] FIG. 4 is a top view of a pole post according to an embodiment of the present application;

[0040] FIG. 5 is a front view of a pole post according to an embodiment of the present application;

[0041] FIG. 6 is an assembly schematic view of a pole post mounting portion, a pole post and an injection molded part according to an embodiment of the present application;

[0042] FIG. 7 is a sectional view in the A-A direction of FIG. 6;

[0043] FIG. 8 is an enlarged view of C in FIG. 7;

[0044] FIG. 9 is a sectional view in the B-B direction of FIG. 6;

[0045] FIG. 10 is a top view of a pole post according to another embodiment of the present application;

[0046] FIG. 11 is a top view of a pole post according to still another embodiment of the present application;

[0047] FIG. 12 is a top view of a pole post according to yet another embodiment of the present application;

[0048] FIG. 13 is a perspective view of a single battery according to an embodiment of the present application;

[0049] Fig. 14 is a sectional view in the direction of D-D in Fig. 13;

[0050] Fig. 15 is an exploded schematic view of a battery according to an embodiment of the present application;

[0051] Fig. 16 is a schematic view of a vehicle according to an embodiment of the present application.

[0052] In Figs. 1-16:

[0053] 100, pole mounting portion; 110, pole mounting hole; 120, explosion-proof valve mounting hole; 130, liquid injection hole;

[0054] 200, pole; 210, first portion; 211, recessed portion; 2111, guide plane; 2112, first side edge; 212, arc-shaped region; 220, second portion; 230, third portion;

[0055] 300, injection molding; 310, glue pooling surface; 320, glue injection mark; 330, protruding portion; 340, arc-shaped portion;

[0056] 400, lower plastic member; 410, first through hole;

[0057] 500, sealing ring;

[0058] 610, explosion-proof valve; 620, protective sheet;

[0059] 700, housing;

[0060] 800, battery cell;

[0061] 900, battery;

[0062] 1000, vehicle. 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 some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0064] As shown in Figs. 1-16, the present application provides a single battery, which can be a secondary battery, of course, but also a disposable battery. The single battery can be a lithium ion battery, of course, but also a sodium ion battery, a magnesium ion battery. The single battery includes a housing 700, a pole 200 and an injection molding 300.

[0065] The shell 700 has a pole mounting portion 100 with a pole mounting hole 110. In some embodiments, the shell can include a shell body with an opening and a cover plate connected to the shell body and sealing the opening. The pole mounting portion 100 can be part of the cover plate or the shell body, or the pole mounting portion 100 can be a separate component mounted on the cover plate or the shell body.

[0066] In this embodiment, the pole mounting portion 100 is a cover plate, and the pole mounting hole 110 is provided on the cover plate. At least part of the pole 200 passes through the pole mounting hole 110, and the part of the pole 200 located in the pole mounting hole 110 has a gap between the pole 200 and the hole wall of the pole mounting hole 110. The number of poles 200 can be two, forming a positive pole and a negative pole. In other embodiments, the number of poles 200 can be more than two, which is not limited here.

[0067] As shown in FIGS. 7 and 8, the injection molding part 300 is arranged around the pole 200 and at least partially located in the gap to connect the pole mounting portion 100 and the pole 200. The number of injection molding parts 300 is the same as the number of poles 200, and each injection molding part 300 is connected to a corresponding pole 200. It should be noted that the two injection molding parts 300 can be insulating materials, so that the pole mounting portion 100 and the pole 200 are insulated from each other. In other embodiments, one injection molding part 300 can be an insulating material, and the other injection molding part 300 can be a conductive material, so that one of the two poles 200 and the pole mounting portion 100 are insulated from each other, and the other is conductive. Here, no limitation is made.

[0068] The injection molding part 300 is formed by injection molding. In a specific injection molding process, a mold is placed around the pole 200 on the pole mounting portion 100. The mold has a glue injection port through which plastic glue is injected into the mold. The plastic glue enters the space formed by the pole 200, the pole mounting portion 100, and the mold from the glue injection port position, part of which flows into the gap to fill the gap. The plastic glue flows in two opposite directions around the side wall of the pole 200 until the two plastic glues flowing in opposite directions contact and form a glue contact surface 310. Therefore, the inner wall of the injection molding part 300 is attached to the side wall of the pole 200, and the structure shape is completely the same. The part of the injection molding part 300 located in the gap can play a role in connecting the pole 200 and the pole mounting portion 100. In this embodiment, the injection molding part 300 is made of insulating material to play a role in electrically isolating the pole 200 and the pole mounting portion 100.

[0069] It should be noted that the dashed line segment for indicating the glue surface 310 in the drawings of the present application is not a line actually existing on the injection molded part 300, but is a schematic line drawn for the convenience of understanding the present application. After injection molding, the position of the glue surface 310 of the injection molded part 300 can form a welding line. If a welding line is formed, the dashed line segment for indicating the glue surface 310 in the drawings can also refer to the welding line actually existing on the injection molded part 300, and the welding line can be a straight line as shown in the drawings or a curved line.

[0070] The position where the side wall of the pole 200 intersects with the glue surface 310 is a glue position. Along the circumferential direction of the side wall, the side wall of the pole 200 has a planar structure on both sides of the glue position (it should be noted that the height of the planar structure on both sides of the glue position in the direction of the center line of the pole 200 can be less than or equal to the height of the glue position), and the included angle between the two planar structures located on both sides of the glue position is greater than 120 degrees and less than or equal to 180 degrees. For example, the included angle can be in the range of greater than 135 degrees and less than or equal to 180 degrees, or in the range of greater than 150 degrees and less than or equal to 180 degrees. Specifically, the included angle can be 120 degrees, 125 degrees, 130 degrees, 135 degrees, 140 degrees, 145 degrees, 150 degrees, 155 degrees, 160 degrees, 165 degrees, 170 degrees, 175 degrees, 180 degrees, or any angle in the above ranges. In addition, it should be noted that the side wall of the pole 200 intersects with the glue surface 310 at a straight line, which is also the straight line formed by the intersection of the above two planar structures.

[0071] The side wall of the pole 200 has a guiding effect on the flow of plastic during the injection molding process. The side wall of the pole 200 has a planar structure on both sides of the glue position, which can guide the flow of plastic about to be glued on both sides of the glue position. The angle between the planar structures on both sides of the glue position is greater than 120 degrees and less than or equal to 180 degrees, which can reduce the plastic flow amount in the third direction generated when the two streams of plastic are glued at the glue position compared to 90 degrees, thereby improving the structural strength of the glue surface 310 of the injection molded part 300. Therefore, the present application can solve the problem of low structural strength of the glue surface position of the injection molded part in the prior art.

[0072] The smaller the glue angle of the two streams of plastic, the greater the plastic flow amount in the third direction synthesized (derived by vector synthesis principle). As the glue angle of the two streams of plastic gradually increases, the plastic flow amount in the third direction gradually decreases, so that the structural strength of the glue surface 310 of the injection molded part 300 gradually increases.

[0073] Therefore, in the embodiment, the included angle between the two planar structures on both sides of the glue merging position can be 180 degrees, so that the two planar structures on both sides of the glue merging position form a guide plane 2111 together. In this way, during the injection molding process, the two streams of plastic converge at the guide plane 2111, so that the flow direction of the two streams of plastic when converging tends to be parallel (as shown in FIG. 3, the arrows in FIG. 3 indicate the flow direction of the two streams of plastic when converging), thereby maximizing the reduction of the amount of plastic flow in the third direction when the glue is merged, thereby maximizing the structural strength of the glue merging surface 310 of the injection molded part 300.

[0074] In a further technical solution, the guide plane 2111 can have a first symmetry line parallel to the center line of the pole 200, and the first symmetry line can be located at the glue merging position. In this case, during the injection molding process, the two streams of plastic converge in the middle of the guide plane 2111, and after flowing to the area where the guide plane 2111 is located, the flow paths of the two streams of plastic are the same, reducing the state difference when the two streams of plastic converge and improving the structural strength of the glue merging surface 310.

[0075] It should be noted that the pole 200 can include a cylindrical structure, a square column structure, a cylindrical structure and / or a square column structure with different diameters (or cross-sectional areas) distributed along the axial direction, or a circular truncated cone structure. In the embodiment, the first part 210 of the pole 200 is a cylindrical structure. Of course, in other embodiments, the pole 200 can also have other shapes, which are not limited herein.

[0076] During the injection molding process, a mold is required, and the mold has a glue injection port. After the mold is removed after the injection molding is completed, the surface of the injection molded part 300 at the position corresponding to the glue injection port will form a glue injection mark 320, so that the injection molded part 300 has the glue injection mark 320, and the position where the glue injection mark 320 of the injection molded part 300 is located is the glue injection position, and the position corresponding to the glue injection position on the side wall of the pole 200 is the starting flow position of the plastic. It should be noted that the position corresponding to the glue injection position on the side wall of the pole 200 can be the position where the plane formed between the straight line where the center of the glue injection mark 320 is located and the center line of the pole 200 intersects with the side wall of the pole 200.

[0077] The pole 200 can be a symmetrical structure, and the starting flow position of the plastic and the glue merging position are both located on the symmetry plane of the pole 200. In this structure, the flow paths of the two streams of plastic converging at the glue merging position are completely consistent, further reducing the state difference when the two streams of plastic converge, and further improving the structural strength of the glue merging surface 310. In other embodiments, the pole 200 can also not be a symmetrical structure, or can be a substantially symmetrical structure (considering the machining error).

[0078] The injection molding part 300 can have one or more glue injection marks 320, i.e., the mold has one or more glue injection ports, and the number of glue injection marks 320 on the injection molding part 300 is consistent with the number of glue injection ports on the mold.

[0079] In this embodiment, the number of glue injection marks 320 is one, and the center of the glue injection mark 320 is located on the plane where the glue collection surface 310 is located. In this case, there is only one glue injection port during the injection molding process, and the plastic injected through the one glue injection port is divided into two flows around the pole column 200. In this way, the injection molding part 300 has only one glue collection surface 310, which reduces the number of weak positions of the injection molding part 300 and improves the structural strength of the injection molding part 300.

[0080] Since the plastic flows around the pole column 200 during the injection molding process, in order to improve the smoothness of the plastic flow, the side wall of the pole column 200 can further include an arc-shaped area 212 distributed on both sides of the guide plane 2111 along the circumference of the side wall of the pole column 200, and the guide plane 2111 and the arc-shaped area 212 can be smoothly connected. In this structure, the sharp corners on the plastic flow path can be reduced, the smoothness of the flow can be improved, and the successful completion of the injection molding process can be ensured.

[0081] In some embodiments, the side wall of the pole column 200 can be provided with at least one recess 211, and the inner wall of the injection molding part 300 has at least one protrusion 330, a protrusion 330 extends into a recess 211 and fits with the recess 211, the bottom surface of the recess 211 in the recess direction is a plane, and the bottom surface of the at least one recess 211 forms a guide plane 2111.

[0082] In this case, the cooperation of the protrusion 330 and the recess 211 makes the pole column 200 and the injection molding part 300 limitedly fit in the center line direction, which can improve the connection strength, position stability, and electrical isolation effectiveness of the pole column 200 and the injection molding part 300.

[0083] The structure of the recess 211 is various, in this embodiment, please refer to FIG. 2, FIG. 4 and FIG. 5, the recess 211 can be a groove structure, which has two oppositely arranged groove walls in the center line direction of the pole column 200 (in this structure, the recess 211 is distributed on the side wall of the first part 210 of the pole column 200). In other embodiments, the recess 211 extends from one side surface of the pole column 200 to the middle part of the pole column 200 along the center line direction of the pole column 200 (specifically, the recess 211 extends from the surface of the third part 230 away from the first part 210 to the middle part of the first part 210, and the recess 211 is distributed on the first part 210 and the third part 230 of the pole column 200).

[0084] The side wall of the pole 200 can further include an arc-shaped area 212, and the arc-shaped area 212 and the recess 211 can be distributed along the circumference of the side wall. The bottom surface of the recess 211 has two first side edges 2112 oppositely arranged along the circumference of the side wall. The two first side edges 2112 of the bottom surface of the recess 211 are respectively formed in the arc-shaped area 212 adjacent to the recess 211. This prevents a dead angle from being formed at the connection position of the recess 211 and the arc-shaped area 212 during injection molding, improves the smoothness of plastic flow, ensures the integrity of the injection molded part 300, and further, the bottom surface of the recess 211 and the arc-shaped area 212 can be smoothly connected, reducing sharp corners during plastic flow, improving the smoothness of flow, speeding up plastic efficiency, reducing plastic time, and improving the structural strength of the injection molded part 300.

[0085] In some embodiments, the number of recesses 211 is multiple, for example, two, four, six, etc. Any two adjacent recesses 211 along the circumference of the side wall of the pole 200 have an arc-shaped area 212, that is, the recesses 211 are not connected along the circumference of the side wall. In other words, the number of recesses 211 can be N, and each recess 211 subtends an angle of less than (360 / N) at the center. In this embodiment, the number of recesses 211 is four.

[0086] In some embodiments, the height of the recess 211 along the direction of the center line of the pole 200 can be greater than 0.3 mm, for example, 0.35 mm, 0.4 mm, 0.45 mm. The depth of the recess 211 along the recess direction can be 0.5 mm-3 mm, for example, 0.5 mm, 1 mm, 2 mm, 3 mm.

[0087] Specifically, the injection molded part 300 includes a connecting portion and an extending portion. The connecting portion is annular, the inner side wall of the connecting portion is in contact with the side wall of the pole 200, and the outer side wall of the connecting portion is in contact with the hole wall of the pole mounting hole 110. The extending portion is connected with the outer side wall of the connecting portion and at least partially located on the side of the pole mounting portion 100 away from the battery cell assembly. The outer shape of the extending portion is square, the square has multiple corners (four in this embodiment), and the glue injection mark 320 is located at the corner position. In this embodiment, the corners can be circular arc chamfers. Compared with this, the area of the corner position is larger, so the glue injection port of the mold is also located at the corner position with a larger area during injection molding, facilitating the injection of plastic.

[0088] The protrusion 330 forming the local glue collection surface 310 has a second symmetry line parallel to the center line of the injection molded part 300. The second symmetry line and the center line of the injection molded part 300 form a first plane. The injection molded part 300 has a glue injection mark 320, and the center of the glue injection mark 320 is located in the first plane.

[0089] The center line of the injection molding part 300 coincides with the center line of the pole column 200, the protruding part 330 forming the partial glue confluence surface 310 extends into the recessed part 211 forming the guide plane 2111, the first symmetry line of the guide plane 2111 parallel to the center line of the pole column 200 and the plane formed by the center line of the pole column 200 coincide with the first plane, that is, the center of the glue injection mark 320 is also located in the plane formed by the first symmetry line of the guide plane 2111 and the center line of the pole column 200.

[0090] In this way, during the injection molding process, the two plastic flows meet in the middle of the guide plane 2111, and after the two plastic flows flow to the area where the guide plane 2111 is located, the flow paths are the same, the state difference when the two plastic flows meet is reduced, and the structural strength of the glue confluence surface 310 is improved.

[0091] In the embodiment, the pole column 200 can include a first part 210 and a second part 220 distributed along the center line direction, the cross-sectional area of the first part 210 is smaller than the cross-sectional area of the second part 220 (the cross-sectional area of the first part 210 and the second part 220 refers to the area of the section perpendicular to the center line of the pole column 200), the first part 210 passes through the pole column mounting hole 110, the recessed part 211 is arranged on the first part 210, and the injection molding part 300 is arranged around the first part 210.

[0092] The pole column mounting part 100 includes a mounting area surrounding the pole column mounting hole 110, the side wall of the first part 210 is further sleeved with a sealing ring 500, and the two opposite surfaces of the sealing ring 500 abut against the mounting area and the second part 220, respectively.

[0093] In this case, the sealing ring 500 can seal the pole column mounting hole 110, which can prevent the internal electrolyte of the monomer battery from leaking on one hand, and on the other hand, can also make the plastic better fill the gap between the pole column mounting part 100 and the first part 210 during the injection molding process, thereby ensuring the connection stability between the injection molding part 300, the pole column 200 and the pole column mounting part 100.

[0094] In the above scheme, the adjacent two recessed parts 211 have an arc-shaped area 212, which can prevent the sealing ring 500 from being embedded into the recessed part 211.

[0095] The minimum distance between the recess 211 and the second part 220 along the center line direction of the pole 200 can be a first distance, and the first distance can be greater than the thickness of the sealing ring 500 to prevent the sealing ring 500 from covering the recess 211, so that the plastic is difficult to flow into the recess 211 during the injection molding process, thereby affecting the connection stability between the injection molded part 300 and the pole 200. It should be noted that the thickness of the sealing ring 500 here refers to the thickness of the sealing ring after compression, that is, the thickness of the sealing ring 500 after assembly. The thickness of the sealing ring in the uncompressed state, that is, the free state, can be greater than the first distance.

[0096] The single battery can further include a lower plastic part 400, the lower plastic part 400 is connected in a stack with the pole mounting part 100, the lower plastic part 400 is provided with a first through hole 410, the first part 210 passes through the first through hole 410 and the pole mounting hole 110, and the second part 220 is located on the side of the lower plastic part 400 away from the pole mounting part 100. Part of the sealing ring 500 can be located in the first through hole 410, and the area of the lower plastic part 400 surrounding the first through hole 410 is located between the mounting area of the pole mounting part 100 and the second part 220, so as to connect and electrically isolate the second part 220 and the pole mounting part 100.

[0097] The single battery can further include an explosion-proof valve 610 and a protective sheet 620. When thermal runaway occurs in the single battery, the explosion-proof valve 610 is blown to release pressure, and the protective sheet 620 can protect the explosion-proof valve sheet to prevent external impurities from affecting the explosion-proof value of the explosion-proof valve. The pole mounting part 100 is provided with an explosion-proof valve mounting hole 120, and the explosion-proof valve 610 and the protective sheet 620 are mounted in the explosion-proof valve mounting hole 120, and the protective sheet 620 covers the explosion-proof valve 610.

[0098] The pole mounting part 100 is provided with a liquid injection hole 130, and the liquid injection hole 130 is used to inject electrolyte. The single battery further includes a sealing pin, and the liquid injection hole 130 is sealed by the sealing pin. The sealing pin includes a sealing aluminum pin and a sealing rubber pin. The sealing aluminum pin is welded on the pole mounting part 100, and the sealing rubber pin is detachably connected with the liquid injection hole 130. When the two are connected, the liquid injection hole 130 is blocked.

[0099] In the single battery of the embodiment of the present application, the pole 200 includes a third part 230, a first part 210 and a second part 220 which are sequentially distributed along the center line direction and have cross-sectional areas gradually increasing. At least part of the first part 210 is arranged in the pole mounting hole 110, and the part located in the pole mounting hole 110 has a gap between the pole mounting hole 110.

[0100] The side wall of the first part 210 of the pole 200 has four recesses 211 recessed radially inward, the four recesses 211 are uniformly distributed in the circumferential direction, and each of any two adjacent recesses 211 has an arc-shaped area 212.

[0101] The bottom surface of the recess 211 in the recess direction is a plane, the bottom surface of one of the recesses 211 forms a guide plane 2111, the bottom surface has two first side edges 2112 disposed opposite in the circumferential direction of the side wall, and the two first side edges 2112 of the bottom surface are respectively formed on the arc-shaped area 212 adjacent to the recess 211 and are smoothly connected with the arc-shaped area 212.

[0102] In the axial direction of the pole 200, the height of the recess 211 is greater than 0.3 mm, and the minimum distance from the recess 211 to the surface of the third part 230 away from the first part 210 is greater than 0.3 mm; in the recess direction of the recess 211, the depth of the recess 211 is 0.5 mm-3 mm; in the radial direction of the pole 200, the distance between the side wall of the third part 230 and the side wall of the first part 210 is greater than 0.2 mm, which can be 0.25 mm, 0.3 mm, and the height of the third part 230 in the axial direction is greater than 0.1 mm, which can be 0.15 mm, 0.2 mm.

[0103] The injection molding part 300 surrounds the first part 210, the inner wall of the injection molding part 300 has convex portions 330 and arc-shaped portions 340 alternately distributed in the circumferential direction, the convex portions 330 extend into the recesses 211 and are adapted to the recesses 211, and the arc-shaped portions 340 are connected with the arc-shaped areas 212.

[0104] The injection molding part 300 extends to the surface of the pole mounting part 100 to form a square column structure, the injection molding part 300 has four corners, and the injection molding part 300 has a glue injection mark 320 located at one of the corners.

[0105] The center of the glue injection mark 320, the center line of the injection molding part 300, the center line of the pole 200, and one of the symmetry lines of the guide plane 2111 are located on the plane where the glue collection surface 310 is located. Among the four recesses 211, two of the recesses 211 are oppositely arranged and respectively adjacent to the glue injection mark 320 and the glue collection surface 310, the bottom surfaces of the one set of oppositely arranged recesses 211 adjacent to the glue injection mark 320 and the glue collection surface 310 are perpendicular to the glue collection surface 310, and the other two of the recesses 211 are oppositely arranged, and the bottom surfaces of the other two recesses 211 are parallel to the glue collection surface 310.

[0106] The pole mounting portion 100 includes a mounting area surrounding the pole mounting hole 110, the side wall of the first portion 210 is further sleeved with a sealing ring 500, and opposite surfaces of the sealing ring 500 abut against the mounting area and the second portion 220 respectively. In the direction of the center line of the pole 200, the minimum distance between the recessed portion 211 and the second portion 220 is a first distance, and the first distance is greater than the thickness of the sealing ring 500.

[0107] Based on the above-mentioned single battery, the embodiment of the application further provides a battery, which comprises the above-mentioned single battery. Since the battery has the above-mentioned single battery, the beneficial effects of the battery brought by the single battery are described above, and will not be repeated here.

[0108] The battery refers to a single physical module comprising one or more single batteries to provide higher voltage and capacity.

[0109] In some embodiments, the battery can be a battery module, and in the case of multiple batteries, the multiple batteries are arranged and fixed to form a battery module.

[0110] In some embodiments, the battery can be a battery pack, and the battery pack comprises a box body and a battery, and the battery or the battery module is contained in the box body.

[0111] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0112] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0113] Based on the above-mentioned single battery or battery, the embodiment of the application further provides a power utilization device, which comprises the above-mentioned single battery or the above-mentioned battery. Since the power utilization device has the above-mentioned single battery or battery, the beneficial effects of the power utilization device brought by the single battery or battery are described above, and will not be repeated here. In the embodiment, the power utilization device is a vehicle 1000.

[0114] In another embodiment of the present application, as shown in FIG. 10, the included angle between the two planar structures on both sides of the glue merging position is 120°, which can reduce the plastic flow amount in the third direction generated when the two plastic flows merge at the glue merging position compared with 90°, thereby improving the structural strength of the glue merging surface 310 of the injection molded part 300. The side wall of the first portion 210 of the pole 200 has two radially inwardly recessed recesses 211, the two recesses 211 are uniformly distributed in the circumferential direction, and each of the two recesses 211 has an arc-shaped area 212 therebetween. The bottom surface of the recess 211 in the recess direction is two connected inclined surfaces, each inclined surface has a first side edge 2112 away from the side edge of the other inclined surface in the circumferential direction of the side wall, and each first side edge 2112 is formed on the arc-shaped area 212 adjacent to the recess 211 and smoothly connected to the arc-shaped area 212. The remaining technical contents can refer to the contents of the foregoing embodiments, which will not be described here again.

[0115] In another embodiment of the present application, as shown in FIG. 11, the included angle between the two planar structures on both sides of the glue merging position is 135°, which can reduce the plastic flow amount in the third direction generated when the two plastic flows merge at the glue merging position compared with 120°, thereby further improving the structural strength of the glue merging surface 310 of the injection molded part 300. The side wall of the first portion 210 of the pole 200 has four radially inwardly recessed recesses 211, the four recesses 211 are uniformly distributed in the circumferential direction, and at this time, there is no arc-shaped area 212 between any two adjacent recesses 211, that is, any two adjacent recesses 211 are directly connected. The bottom surface of the recess 211 in the recess direction is two connected inclined surfaces, each inclined surface has a first side edge 2112 away from the side edge of the other inclined surface in the circumferential direction of the side wall, and any two adjacent recesses 211 share the same first side edge 2112. The remaining technical contents can refer to the contents of the foregoing embodiments, which will not be described here again.

[0116] In another embodiment of the present application, as shown in FIG. 12, the included angle between the two planar structures on both sides of the glue merging position is 150°, which can reduce the plastic flow amount in the third direction generated when the two plastic flows merge at the glue merging position compared with 135°, thereby improving the structural strength of the glue merging surface 310 of the injection molded part 300. The side wall of the first portion 210 of the pole 200 has four radially inwardly recessed recesses 211, the four recesses 211 are uniformly distributed in the circumferential direction, and each of the two recesses 211 has an arc-shaped area 212 therebetween. The bottom surface of the recess 211 in the recess direction is two connected inclined surfaces, each inclined surface has a first side edge 2112 away from the side edge of the other inclined surface in the circumferential direction of the side wall, and each first side edge 2112 is formed on the arc-shaped area 212 adjacent to the recess 211 and smoothly connected to the arc-shaped area 212. The remaining technical contents can refer to the contents of the foregoing embodiments, which will not be described here again.

[0117] The above describes the basic principles of the present application in combination with specific embodiments, but it is pointed out that the advantages, benefits, effects and the like mentioned in the present application are only examples and are not limiting, and these advantages, benefits, effects and the like cannot be considered as necessary for each embodiment of the present application. In addition, the above specific details disclosed are only for the purpose of example and understanding, and are not limiting, and the above details do not limit the present application to be necessarily implemented with the above specific details.

[0118] It is also pointed out that in the single battery of the present application, each component can be disassembled and / or reassembled. These disassembly and / or reassembly should be considered as equivalent solutions of the present application.

[0119] The above description of the disclosed aspects is provided so that any person skilled in the art can make or use the present application. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

[0120] It should be understood that the limiting words "first", "second", "third" used in the embodiments of the present application are only used for clearer description of the technical solutions, and cannot be used to limit the protection scope of the present application.

[0121] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain modifications, alterations, changes, additions and sub-combinations thereof.

Claims

1. A single cell, characterized by, The application relates to a shell (700) with a pole mounting portion (100) provided with a pole mounting hole (110), a pole (200) at least partially arranged in the pole mounting hole (110) and having a gap between the pole mounting hole (110) and the portion of the pole (200) located in the pole mounting hole (110), and an injection molding part (300) arranged around the pole (200) and at least partially located in the gap to connect the pole mounting portion (100) and the pole (200), wherein the injection molding part (300) has a glue collecting surface (310), the intersection of the side wall of the pole (200) and the glue collecting surface (310) is a glue collecting position, the side wall of the pole (200) has a planar structure on both sides of the glue collecting position along the circumferential direction of the side wall of the pole (200), and the included angle between the two planar structures on both sides of the glue collecting position is greater than 120 degrees and less than or equal to 180 degrees. The included angle between the two planar structures on both sides of the glue collecting position is 180 degrees, and the two planar structures jointly form a guide plane (2111). The guide plane (2111) has a first symmetry line parallel to the center line of the pole (200), and the first symmetry line is located at the glue collecting position. The injection molding part (300) has a glue injection mark (320), the position of the glue injection mark (320) of the injection molding part (300) is a glue injection position, the position corresponding to the glue injection position of the side wall of the pole (200) is a plastic glue starting flowing position, the pole (200) is a symmetrical structure, and the plastic glue starting flowing position and the glue collecting position are located on the symmetry plane of the pole (200). The number of the glue injection mark (320) is one, and the center of the glue injection mark (320) is located on the plane where the glue collecting surface (310) is located.

2. The cell according to claim 1, wherein Along the circumferential direction of the side wall of the pole (200), the side wall of the pole (200) further comprises an arc-shaped area (212) distributed on both sides of the guide plane (2111).

3. The cell according to claim 2, wherein The guide plane (2111) and the arc-shaped area (212) are smoothly connected.

4. The cell according to claim 3, wherein The side wall of the pole (200) is provided with at least one recess (211), the inner wall of the injection molding part (300) is provided with at least one protrusion (330), one protrusion (330) is matched with one recess (211), and the protrusion (330) extends into the recess (211). The bottom surface of the recess (211) in the recess direction is a plane, and the bottom surface of at least one recess (211) forms the guide plane (2111).

5. The cell according to claim 4, wherein ​ 6. The cell according to claim 2, wherein ​ ​ 7. The single cell according to any one of claims 2 to 6, characterized in that, ​ ​ 8. The cell according to claim 7, wherein The side wall of the pole column (200) comprises an arc-shaped area (212), the arc-shaped area (212) and the recess (211) are distributed along the circumference of the side wall of the pole column (200), the bottom surface of the recess (211) has two first side edges (2112) oppositely arranged along the circumference of the side wall of the pole column (200), and the two first side edges (2112) of the bottom surface of the recess (211) are respectively formed in the arc-shaped area (212) adjacent to the recess (211).

9. The cell according to claim 8, wherein The number of the recesses (211) is four, and the arc-shaped areas (212) and the recesses (211) are alternately distributed along the circumference of the side wall of the pole column (200).

10. The cell according to claim 7, wherein The height of the recess (211) is greater than 0.3 mm in the direction of the center line of the pole column (200).

11. The cell according to claim 7, wherein The depth of the recess (211) is 0.5 mm-3 mm in the recess direction of the recess (211).

12. The cell according to claim 7, wherein The protrusion (330) forming the local glue collecting surface (310) has a second symmetry line parallel to the center line of the injection molding part (300), and the second symmetry line and the center line of the injection molding part (300) form a first plane. The injection molding part (300) has a glue injection mark (320), and the center of the glue injection mark (320) is located on the first plane.

13. The cell of claim 7 wherein, The pole column (200) comprises a first part (210) and a second part (220) distributed along the center line direction, the cross-sectional area of the first part (210) is smaller than that of the second part (220), the first part (210) passes through the pole column mounting hole (110), the recess (211) is arranged on the first part (210), and the injection molding part (300) is arranged around the first part (210). The pole column mounting part (100) comprises a mounting area surrounding the pole column mounting hole (110), the side wall of the first part (210) is further sleeved with a sealing ring (500), and the opposite two surfaces of the sealing ring (500) respectively abut against the mounting area and the second part (220).

14. The cell according to claim 13, wherein In the direction of the center line of the pole column (200), the minimum distance between the recess (211) and the second part (220) is a first distance, and the first distance is greater than the thickness of the sealing ring (500).

15. The cell of claim 1 wherein, The injection molding part (300) extends to the surface of the pole column mounting part (100) to form a square column structure, and the injection molding part (300) has a circular ring inner wall surrounding the pole column (200). The injection molding part (300) has a plurality of corners, and the injection molding part (300) has a glue injection mark (320), and the glue injection mark (320) is located at the corner.

16. A battery, characterized by The single battery comprises the single battery as claimed in any one of claims 1-15.

17. An electrical device, comprising: The battery comprises the single battery as claimed in any one of claims 1-15 or the battery as claimed in claim 16.

Images