Single battery, battery and electric device

Abstract

The utility model relates to the technical field of batteries, and provides a single battery, a battery and a power utilization device.The single battery comprises a shell, a pole and an injection molding part, the shell is provided with a pole mounting part, the pole mounting part is provided with a pole mounting hole, and at least part of the pole penetrates through the pole mounting hole; the injection molding part is arranged around the pole, at least part of the injection molding part is located in the gap so as to connect the pole mounting part and the pole, the injection molding part is provided with a glue collecting face, the position where the side wall of the pole intersects with the glue collecting face is a glue collecting position, and the glue collecting face is located in the glue collecting position in the circumferential direction of the side wall of the pole. The two sides of the glue collecting position are provided with plane structures, and the included angle between the two plane structures located on the two sides of the glue collecting position is larger than 120 degrees and smaller than or equal to 180 degrees. According to the scheme, the problem that in the prior art, the structural strength of the glue gathering face position of an injection molding part is low can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a single battery, a battery and a power utilization device. BACKGROUND

[0002] With the rapid development of the new energy industry, the requirements for battery performance are also becoming higher and higher. The pole is an important component of the battery, and the structural strength of the injection molding part for connecting the pole and the battery shell has an important influence on the stability of the pole, thereby having an important influence on the safety performance of the battery.

[0003] 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, and finally contacts and converges to form a complete injection molding part. In the prior art, the flow angles of the two streams of plastic at the convergence position are 90 degrees. When the two streams of plastic converge at 90 degrees, flow in the third direction (different from the flow direction of the two streams of plastic) is generated, and the flow amount is large, resulting in low strength of the glue convergence surface position of the injection molding part, which affects the safety performance of the battery. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application provides a single battery, a battery and a power utilization device to solve the problem of low structural strength of the glue convergence surface position of the injection molding part in the prior art.

[0005] In order to achieve the above purpose, the present application provides the following technical solutions:

[0006] A single battery comprises:

[0007] A housing has a pole mounting portion, and the pole mounting portion is provided with a pole mounting hole;

[0008] A pole is at least partially arranged in the pole mounting hole, and the portion located in the pole mounting hole has a gap between the pole mounting hole;

[0009] An injection molding part is arranged around the pole and at least partially located in the gap to connect the pole mounting portion and the pole, and the injection molding part has a glue convergence surface;

[0010] The position where the side wall of the pole intersects with the glue convergence surface is a glue convergence position, and two sides of the glue convergence position have a planar structure along the circumferential direction of the side wall of the pole, and the included angle between the two planar structures located on the two sides of the glue convergence position is greater than 120 degrees and less than or equal to 180 degrees. Optionally, the included angle between the two planar structures located on the two sides of the glue convergence position is 180 degrees, so that the two planar structures located on the two sides of the glue convergence position form a guide plane together.

[0011] Optionally, the guide plane has a first symmetry line parallel to the center line of the pole, and the first symmetry line is located at the glue collection position.

[0012] Optionally, the injection molding part has a glue injection mark, the glue injection mark of the injection molding part is located at a glue injection position, and a side wall of the pole corresponds to a plastic starting flow position at the glue injection position.

[0013] The pole is a symmetrical structure, and the plastic starting flow position and the glue collection position are located on the symmetry plane of the pole.

[0014] Optionally, the number of glue injection marks is one, and the center of the glue injection mark is located on the plane where the glue collection plane is located.

[0015] Optionally, along the circumference of the side wall of the pole, the side wall of the pole further comprises an arc-shaped area distributed on both sides of the guide plane.

[0016] The guide plane is smoothly connected with the arc-shaped area.

[0017] Optionally, the side wall of the pole is provided with a recess, the inner wall of the injection molding part has a protruding part, the protruding part is matched with the recess, and the protruding part extends into the recess.

[0018] The bottom surface of the recess in the recess direction is a plane, and the bottom surface of at least one recess forms the guide plane.

[0019] Optionally, the side wall of the pole comprises an arc-shaped area, the arc-shaped area and the recess are distributed along the circumference of the side wall of the pole, the bottom surface of the recess has two first side edges arranged opposite to each other along the circumference of the side wall of the pole, and the two first side edges of the bottom surface of the recess are formed on the arc-shaped area.

[0020] The bottom surface of the recess is smoothly connected with the arc-shaped area.

[0021] Optionally, the number of recesses is four, and any two adjacent recesses have an arc-shaped area therebetween along the circumference of the side wall of the pole.

[0022] Optionally, along the direction of the center line of the pole, the height of the recess is greater than 0.3mm.

[0023] Optionally, along the recess direction of the recess, the depth of the recess is 0.5mm-3mm.

[0024] Optionally, the protruding part forming the partial glue collection plane has a second symmetry line parallel to the axis of the injection molding part, and the second symmetry line and the axis of the injection molding part form a first plane.

[0025] The injection molding part has a glue injection mark, and a center of the glue injection mark is located on the first plane.

[0026] Optionally, the pole post comprises a first portion and a second portion distributed along a center line direction, a cross-sectional area of the first portion is smaller than that of the second portion, the first portion passes through the pole post mounting hole, the recess is arranged on a side wall of the second portion, and the injection molding part is arranged around the first portion; the pole post mounting portion comprises a mounting area surrounding the pole post mounting hole, an edge of the second portion is opposite to the mounting area, and a side wall of the first portion is further sleeved with a sealing ring, and two opposite surfaces of the sealing ring are respectively abutted against the mounting area and the second portion.

[0027] Optionally, a minimum distance between the recess and the second portion along the center line direction of the pole post is a first distance, and the first distance is greater than a thickness of the sealing ring.

[0028] Optionally, the pole post comprises a first portion and a second portion sequentially distributed along an axial direction and gradually increasing in cross-sectional area, at least part of the first portion passes through the pole post mounting hole, and a gap is formed between the part of the first portion located in the pole post mounting hole and the pole post mounting hole.

[0029] The side wall of the second portion of the pole post has four recesses recessed radially inward, the four recesses are uniformly distributed in a circumferential direction, and each of the four recesses has an arc-shaped area between any two adjacent recesses.

[0030] A bottom surface of the recess in a recess direction is a plane, the bottom surface of one of the recesses forms the guide plane, the bottom surface has two first side edges arranged opposite to each other in the circumferential direction of the side wall, and the two first side edges of the bottom surface are shaped on the adjacent arc-shaped areas and are smoothly connected with the arc-shaped areas.

[0031] The injection molding part is distributed around the first portion, an inner wall of the injection molding part has a convex portion and an arc-shaped portion alternately distributed in the circumferential direction, the convex portion extends into the recess and is adapted to the recess, and the arc-shaped portion is connected with the arc-shaped area in a fit manner.

[0032] The injection molding part extends to a surface of the pole post mounting portion to form a square column structure, the injection molding part has four corners, the injection molding part has a glue injection mark, and the glue injection mark is located at one of the corners.

[0033] A center of the glue injection mark, an axis of the injection molding part, an axis of the pole post, and one of the symmetric lines of the guide plane are located on a plane where the glue injection surface is located.

[0034] The pole mounting portion comprises a mounting area surrounding the pole mounting hole, and the edge of the second part is opposite to the mounting area. 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. In the axial direction of the pole, the minimum distance between the recess and the second part is a first distance, which is greater than the thickness of the sealing ring.

[0035] Optionally, the injection molding part extends to the surface of the pole mounting portion to form a square column structure, and the injection molding part has an annular inner wall surrounding the pole.

[0036] The injection molding part has a plurality of corners, and the injection molding part has a glue injection mark located at the corner.

[0037] A battery comprising the single battery described above.

[0038] An electric device comprising the single battery described above or the battery described above.

[0039] In the embodiments of the present application, the side wall of the pole has a guiding effect on the flow of plastic during injection molding. The two sides of the glue collection position of the pole have a planar structure. The planar structures on both sides of the glue collection position can guide the flow of plastic about to be collected. The angle between the planar structures on both sides of the glue collection position is greater than 120 degrees and less than or equal to 180 degrees. This can reduce the amount of plastic flowing in the third direction when two streams of plastic are collected at the glue collection position compared to 90 degrees, thereby improving the structural strength of the glue collection surface of the injection molding part. Therefore, the present application can solve the problem of low structural strength of the glue collection surface of the injection molding part in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creative labor.

[0041] Figure 1 An exploded view of part of the single battery provided in the embodiments of the present application;

[0042] Figure 2 A structural schematic diagram of the injection molding part and the pole provided in the embodiments of the present application;

[0043] Figure 3 A top view of the injection molding part provided in the embodiments of the present application;

[0044] Figure 4A top view of the pole column provided for the embodiment of the present application;

[0045] Figure 5 A front view of the pole column provided for the embodiment of the present application;

[0046] Figure 6 An assembly schematic diagram of the pole column mounting portion, the pole column and the injection molding part provided for the embodiment of the present application;

[0047] Figure 7 A sectional view in the A-A direction of Figure 6

[0048] Figure 8 An enlarged view at C of Figure 7

[0049] Figure 9 A sectional view in the B-B direction of Figure 6

[0050] In Figures 1-9

[0051] 100, pole column mounting portion; 110, pole column mounting hole; 120, explosion-proof valve mounting hole; 130, liquid injection hole;

[0052] 200, pole column; 210, first portion; 211, recessed portion; 2111, guide plane; 2112, first side edge; 212, arc-shaped area; 220, second portion; 230, third portion;

[0053] 300, injection molding part; 310, glue collecting surface; 320, glue injection mark; 330, protruding portion; 340, arc-shaped portion;

[0054] 400, lower plastic part; 410, first through hole;

[0055] 500, sealing ring;

[0056] 610, explosion-proof valve; 620, protective sheet. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0058] As Figures 1-9 ​​​​As shown, the embodiment of the present application provides a single battery, which can be a secondary battery, of course, can also be a disposable battery. The single battery can be a lithium ion battery, of course, can also be a sodium ion battery, magnesium ion battery. The single battery includes a housing, a pole 200 and an injection molding part 300.

[0059] The housing has a pole mounting portion 100, and the pole mounting portion 100 is provided with a pole mounting hole 110. Optionally, the housing can include a shell and a cover plate, the shell is provided with an opening, the cover plate is connected with the shell and seals the opening, the pole mounting portion 100 can be part of the cover plate or the shell, or the pole mounting portion 100 can also be a component outside the cover plate and the shell, and is installed on the cover plate or the shell.

[0060] At least part of the pole 200 is arranged in the pole mounting hole 110, and the part of the pole 200 in the pole mounting hole 110 has a gap between the pole mounting hole 110 and the hole wall. The number of poles 200 can be two, which form a positive pole and a negative pole respectively.

[0061] 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 is connected one by one with the pole 200. It should be noted that the injection molding part 300 can be an insulating material, 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.

[0062] The injection molding part 300 is formed by injection molding. In a specific injection molding process, a mold is placed on the pole mounting portion 100 around the pole 200, the mold has a glue injection port, and plastic is injected into the mold through the glue injection port. The plastic 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, and the plastic flows in two opposite directions around the side wall of the pole 200, until the two plastic flows in opposite directions contact and form a glue collection 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.

[0063] It should be noted that the dashed line segment for representing the glue joint 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 joint surface 310 of the injection molded part 300 can form a weld line. If a weld line is formed, the dashed line segment for representing the glue joint surface 310 in the drawings can also refer to the weld line actually existing on the injection molded part 300, and the weld line can be a straight line as shown in the drawings or a curved line.

[0064] The position where the side wall of the pole 200 intersects with the glue joint surface 310 is a glue joint position. Along the circumference of the side wall, the two sides of the glue joint position have a planar structure (it should be noted that the height of the planar structure on the two sides of the glue joint position in the direction of the center line of the pole 200 can be less than or equal to the height of the glue joint position), and the included angle between the two planar structures located on the two sides of the glue joint position is greater than 120 degrees and less than or equal to 180 degrees. In addition, it should be noted that the side wall of the pole 200 intersects with the glue joint surface 310 at a straight line, which is also a straight line formed by the intersection of the above two planar structures.

[0065] In the embodiments of the present application, the side wall of the pole 200 has a guiding effect on the flow of plastic during injection molding. The two sides of the glue joint position of the pole 200 have a planar structure, which can guide the flow of plastic about to be glued. The angle between the planar structures on the two sides of the glue joint 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 joint position, thereby improving the structural strength of the glue joint surface 310 of the injection molded part 300. Therefore, the present application can solve the problem of low structural strength of the glue joint surface position of the injection molded part in the prior art.

[0066] The smaller the glue joint angle of the two streams of plastic, the greater the plastic flow amount in the third direction synthesized (obtained by vector synthesis principle). As the glue joint 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 joint surface 310 of the injection molded part 300 gradually increases.

[0067] Therefore, in a preferred embodiment, the included angle between the two planar structures located on the two sides of the glue joint position can be 180 degrees, so as to form a guide plane 2111 together with the two planar structures located on the two sides of the glue joint position. In this way, during injection molding, the two streams of plastic meet at the guide plane 2111, so that the flow direction of the two streams of plastic tends to be parallel when they meet, thereby minimizing the plastic flow amount in the third direction generated when the two streams of plastic meet, and thereby maximizing the structural strength of the glue joint surface 310 of the injection molded part 300.

[0068] 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 glue meet 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 glue are the same, which reduces the state difference when the two streams of plastic glue merge and improves the structural strength of the glue merging surface 310.

[0069] 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 case of a cylindrical structure, the center line of the pole 200 is the axis. Of course, in other embodiments, the pole 200 can also have other shapes, which are not limited herein.

[0070] During the injection molding process, a mold is required, which has a glue injection port. After the mold is removed after the injection molding is completed, the surface of the injection molded part 300 will form a glue injection mark 320 at the position corresponding to the glue injection port, 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 plastic glue starting flow position. 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.

[0071] The pole 200 can be a symmetrical structure, and the plastic glue starting flow position 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 glue merging at the glue merging position are completely consistent, further reducing the state difference when the two streams of plastic glue merge, and further improving the structural strength of the glue merging surface 310.

[0072] The injection molded 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 molded part 300 is consistent with the number of glue injection ports on the mold.

[0073] In a preferred 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 merging surface 310 is located. In this case, there is only one glue injection port during the injection molding process, and the plastic glue injected through the one glue injection port is divided into two streams flowing around the pole 200. In this way, the injection molded part 300 has only one glue merging surface 310, which reduces the number of weak strength positions of the injection molded part 300 and improves the structural strength of the injection molded part 300.

[0074] Due to the plastic flows around the pole column 200 in 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 in the plastic flow process can be reduced, the smoothness of the flow is improved, and the smooth completion of the injection molding process is ensured.

[0075] In the embodiment of the present application, the side wall of the pole column 200 can be provided with a recessed part 211, and the inner wall of the injection molding part 300 has a protruding part 330, the protruding part 330 extends into the recessed part 211 and is matched with the recessed part 211, the bottom surface of the recessed part 211 in the recessed direction is a plane, and the bottom surface of at least one recessed part 211 forms a guide plane 2111.

[0076] In this case, the cooperation of the protruding part 330 and the recessed part 211 makes the pole column 200 and the injection molding part 300 limitedly matched 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.

[0077] The structure of the recessed part 211 has various forms. In an alternative embodiment, please refer to Figure 2 , Figure 4 and Figure 5 , the recessed part 211 can be a groove structure, and in the center line direction of the pole column 200, there are two groove walls oppositely arranged (in this structure, the recessed part 211 is distributed on the side wall of the first part 210 of the pole column 200). In another alternative embodiment, the recessed part 211 extends from one side surface of the pole column 200 to the middle part of the pole column 200 in the center line direction of the pole column 200 (specifically, the recessed part 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 recessed part 211 is distributed on the first part 210 and the third part 230 of the pole column 200).

[0078] The side wall of the pole column 200 can further include an arc-shaped area 212, and the arc-shaped area 212 and the recessed part 211 can be distributed along the circumference of the side wall. The bottom surface of the recessed part 211 has two first side edges 2112 oppositely arranged along the circumference of the side wall, and the two first side edges 2112 of the bottom surface of the recessed part 211 are formed on the arc-shaped area 212, so as to prevent the connection position of the recessed part 211 and the arc-shaped area 212 from forming a dead angle in the injection process, improve the smoothness of the flow, ensure the integrity of the injection molding part 300, and further, the bottom surface of the recessed part 211 and the arc-shaped area 212 can be smoothly connected, so as to reduce the sharp corners in the plastic flow process, improve the smoothness of the flow, speed up the plastic efficiency, reduce the plastic time, and improve the structural strength of the injection molding part 300.

[0079] In the embodiments of the present application, the number of recesses 211 is multiple, for example, four, six, etc., and each two adjacent recesses 211 have an arc-shaped area 212 along the circumference of the side wall of the pole column 200, 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 the central angle of each recess 211 is less than (360 / N).

[0080] The height of the recess 211 along the direction of the center line of the pole column 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 of the recess 211 can be 0.5 mm-3 mm, for example, 0.5 mm, 1 mm, 2 mm, 3 mm.

[0081] Specifically, the injection molding part 300 includes a connecting part and an extending part. The connecting part is annular, the inner side wall of the connecting part is in contact with the side wall of the pole column 200, and the outer side wall of the connecting part is in contact with the hole wall of the pole column mounting hole 110. The extending part is connected with the outer side wall of the connecting part and at least partially located on the side of the pole column mounting part 100 away from the battery cell assembly. The outer shape of the extending part is square, the square has multiple corners (four in the embodiments), and the injection mark 320 is located at the corner position. Alternatively, the corner can be a circular arc chamfer. Compared with this, the area of the corner position is larger, so in the injection molding process, the injection port of the mold is also located at the corner position with larger area, facilitating the injection of plastic.

[0082] The protruding part 330 forming the partial glue collecting surface 310 has a second symmetry line parallel to the axis of the injection molding part 300, the second symmetry line and the axis of the injection molding part 300 form a first plane, the injection molding part 300 has an injection mark 320, and the center of the injection mark 320 is located in the first plane.

[0083] The axis of the injection molding part 300 coincides with the axis of the pole column 200, the protruding part 330 forming the partial glue collecting surface 310 extends into the recess 211 forming the guide plane 2111, the first symmetry line of the guide plane 2111 parallel to the axis of the pole column 200 and the axis of the pole column 200 form a plane coinciding with the first plane, that is, the center of the injection mark 320 is also located in the plane formed by the first symmetry line of the guide plane 2111 and the axis of the pole column 200.

[0084] In this way, in the injection molding process, the two streams of plastic meet 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 meet, and improving the structural strength of the glue collecting surface 310.

[0085] In the embodiment of the application, 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 that 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 recess 211 is arranged on the side wall outside the second part 220, and the injection molding part 300 is arranged around the first part 210.

[0086] The pole column mounting part 100 includes a mounting area surrounding the pole column mounting hole 110, the edge of the second part 220 is opposite to the mounting area, the side wall of the first part 210 is further sleeved with the sealing ring 500, and the opposite two surfaces of the sealing ring 500 abut against the mounting area and the second part 220 respectively.

[0087] In this case, the sealing ring 500 can seal the pole column mounting hole 110, which can prevent the internal electrolyte of the single battery from leaking on one hand, and can also enable the plastic to 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.

[0088] In the above scheme, the adjacent two recesses 211 have an arc-shaped area 212, which can prevent the sealing ring 500 from being embedded into the recess 211.

[0089] In the center line direction of the pole column 200, the minimum distance between the recess 211 and the second part 220 can be a first distance, and the first distance can be greater than the thickness of the sealing ring 500, so as to prevent the sealing ring 500 from covering the recess 211, which can make it difficult for the plastic to flow into the recess 211 during the injection molding process, thereby affecting the connection stability between the injection molding part 300 and the pole column 200. It should be noted that the thickness of the sealing ring 500 here refers to the thickness of the sealing ring 500 after compression, that is, the thickness of the sealing ring 500 after assembly, and the thickness of the sealing ring in the uncompressed state, that is, the free state, can be greater than the first distance.

[0090] The single battery can further include a lower plastic part 400, the lower plastic part 400 is connected in a stacked manner with the pole column mounting part 100, the lower plastic part 400 is provided with a first perforation 410, the first part 210 passes through the first perforation 410 and the pole column mounting hole 110, the second part 220 is located on the side of the lower plastic part 400 away from the pole column mounting part 100, part of the sealing ring 500 can be located in the first perforation 410, and the area of the lower plastic part 400 surrounding the first perforation 410 is located between the mounting area of the pole column mounting part 100 and the second part 220, so as to connect and electrically isolate the second part 220 and the pole column mounting part 100.

[0091] The battery cell may also include an explosion-proof valve 610 and a protective sheet 620. In the event of thermal runaway within the battery cell, the explosion-proof valve 610 explodes to release pressure. The protective sheet 620 protects the valve, preventing external impurities from affecting the valve's burst value. The terminal mounting portion 100 defines an explosion-proof valve mounting hole 120. Both the explosion-proof valve 610 and the protective sheet 620 are mounted in the explosion-proof valve mounting hole 120, with the protective sheet 620 covering the explosion-proof valve 610.

[0092] The pole mounting portion 100 is provided with an injection hole 130 for injecting electrolyte. The single cell further includes a sealing nail, and the injection hole 130 is sealed by the sealing nail. The sealing nail includes a sealing aluminum nail and a sealing glue nail. The sealing aluminum nail is welded to the pole mounting portion 100, and the sealing glue nail is detachably connected to the injection hole 130. When the two are connected, the injection hole 130 is blocked.

[0093] In the single cell 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 distributed in sequence along the axial direction and have gradually increasing cross-sectional areas. At least a portion of the first part 210 is passed through the pole mounting hole 110, and there is a gap between the portion located in the pole mounting hole 110 and the pole mounting hole 110.

[0094] The side wall outside the second portion 220 of the pole 200 has four recessed portions 211 that are recessed radially inward. The four recessed portions 211 are evenly distributed along the circumference, and there is an arc-shaped area 212 between any two adjacent recessed portions 211 .

[0095] The bottom surface of the recessed portion 211 along the recessed direction is a plane, wherein the bottom surface of one recessed portion 211 forms a guide plane 2111, and the bottom surface has two first side edges 2112 arranged opposite to each other along the circumference of the side wall. The two first side edges 2112 of the bottom surface are both formed in the adjacent arc-shaped area 212 and smoothly connected to the arc-shaped area 212.

[0096] Along the axial direction of the pole 200, the height of the recessed portion 211 is greater than 0.3 mm, and the minimum distance between the recessed portion 211 and the surface of the third portion 230 facing away from the first portion 210 is greater than 0.3 mm; along the concave direction of the recessed portion 211, the depth of the recessed portion 211 is 0.5 mm-3 mm; along the radial direction of the pole 200, the distance between the side wall of the third portion 230 and the side wall of the first portion 210 is greater than 0.2 mm, and can be 0.25 mm or 0.3 mm. The height of the third portion 230 in the axial direction is greater than 0.1 mm, and can be 0.15 mm or 0.2 mm.

[0097] The injection molding part 300 is distributed around the first part 210, and the inner wall of the injection molding part 300 has protruding portions 330 and arc-shaped portions 340 alternately distributed in the circumferential direction, the protruding portions 330 extend into the recessed portions 211 and are adapted to the recessed portions 211, and the arc-shaped portions 340 are connected to the arc-shaped areas 212 in a fit manner.

[0098] The injection molding part 300 extends to the surface of the pole mounting portion 100, forms a square columnar structure, has four corners, and has a glue injection mark 320 located at one of the corners.

[0099] The center of the glue injection mark 320, the axis of the injection molding part 300, the axis of the pole 200, and one of the symmetric lines of the guide plane 2111 are all located in the plane where the glue collecting surface 310 is located. Among the four recessed portions 211, two of the recessed portions 211 are oppositely arranged and are respectively adjacent to the glue injection mark 320 and the glue collecting surface 310, the bottom surfaces of the set of oppositely arranged recessed portions 211 adjacent to the glue injection mark 320 and the glue collecting surface 310 are perpendicular to the glue collecting surface 310, and the other two of the recessed portions 211 are oppositely arranged, and the bottom surfaces of the other two of the recessed portions 211 are parallel to the glue collecting surface 310.

[0100] The pole mounting portion 100 includes a mounting area surrounding the pole mounting hole 110, and the edge of the second part 220 is opposite to the mounting area. The side wall of the first part 210 is further sleeved with a sealing ring 500, and the opposite surfaces of the sealing ring 500 are respectively abutted against the mounting area and the second part 220. In the axial direction of the pole 200, the minimum distance between the recessed portion 211 and the second part 220 is a first distance, and the first distance is greater than the thickness of the sealing ring 500.

[0101] Based on the above-mentioned single battery, the embodiments of the present application further provide 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 described here.

[0102] The battery refers to a single physical module comprising one or more single batteries to provide higher voltage and capacity.

[0103] In some optional 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.

[0104] In some optional 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.

[0105] In some optional embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0106] In some optional embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0107] Based on the above-mentioned single cell or battery, an embodiment of the present application further provides an electrical device, which includes the above-mentioned single cell or battery. Since the electrical device includes the above-mentioned single cell or battery, the beneficial effects of the electrical device provided by the single cell or battery are described above and will not be repeated here.

[0108] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0109] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0110] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0111] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may 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 rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0112] It should be understood that the limiting words "first", "second", "third", "fourth", "fifth" and "sixth" used in the embodiments of the present application are only used for more clearly explaining the technical solutions, and cannot be used to limit the protection scope of the present application.

[0113] The above description is given for the purpose of illustration and description. Furthermore, this description does not intend to limit the embodiments of the present application to the forms disclosed herein. Although several example aspects and embodiments have been discussed above, those of ordinary skill in the art will appreciate a variety of modifications, alternatives, permutations, additions, and sub-combinations of the described aspects and embodiments.

Claims

1. A single cell, characterized by, The application relates to a shell 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), 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), the injection molding part (300) having a glue collecting surface (310), a glue collecting position where the side wall of the pole (200) intersects with the glue collecting surface (310), two flat structures on both sides of the glue collecting position along the circumference of the side wall of the pole (200), and an included angle between the two flat structures on both sides of the glue collecting position being greater than 120 degrees and less than or equal to 180 degrees. The included angle between the two flat structures on both sides of the glue collecting position is 180 degrees, so that the two flat structures on both sides of the glue collecting position 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 flow position, the pole (200) is a symmetrical structure, and the plastic glue starting flow 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 circumference 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 a recess (211), the inner wall of the injection molding part (300) is provided with a protrusion (330), the protrusion (330) is matched with the 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 (200) comprises an arc-shaped area (212), the arc-shaped area (212) and the recessed portion (211) are distributed along the circumference of the side wall of the pole (200), the bottom surface of the recessed portion (211) has two first side edges (2112) arranged opposite to each other along the circumference of the side wall of the pole (200), and the two first side edges (2112) of the bottom surface of the recessed portion (211) are both formed in the arc-shaped area (212); The bottom surface of the recessed portion (211) is smoothly connected to the arc-shaped area (212).

9. The cell according to claim 7, wherein The number of the recessed portions (211) is four, and along the circumferential direction of the side wall of the pole (200), there is an arc-shaped area (212) between any two adjacent recessed portions (211).

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

11. The single cell according to claim 7, characterized in that: Along the concave direction of the concave portion (211), the depth of the concave portion (211) is 0.5 mm-3 mm.

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 axis of the injection molded part (300), and the second symmetry line and the axis 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 on the first plane.

13. The cell of claim 7 wherein, The pole (200) comprises a first portion (210) and a second portion (220) distributed along a centerline direction, the cross-sectional area of ​​the first portion (210) is smaller than the cross-sectional area of ​​the second portion (220), the first portion (210) passes through the pole mounting hole (110), the recessed portion (211) is provided on a side wall outside the second portion (220), and the injection molded part (300) is provided around the first portion (210); The pole mounting portion (100) includes a mounting area surrounding the pole mounting hole (110); the edge of the second portion (220) is opposite to the mounting area; a sealing ring (500) is further sleeved on the side wall of the first portion (210); and two opposite surfaces of the sealing ring (500) respectively abut against the mounting area and the second portion (220).

14. The cell according to claim 13, wherein Along the centerline direction 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).

15. The cell of claim 2, wherein, The pole (200) comprises a first portion (210) and a second portion (220) which are sequentially distributed along the axial direction and whose cross-sectional areas gradually increase; at least a portion of the first portion (210) is disposed through the pole mounting hole (110), and a gap exists between the portion located in the pole mounting hole (110) and the pole mounting hole (110); The side wall outside the second part (220) of the pole post (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); The bottom surface of the recess (211) in the recess direction is a plane, and the bottom surface of one of the recesses (211) forms the 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 shaped on and smoothly connected with the adjacent arc-shaped area (212); The injection molding part (300) surrounds the first part (210), and the inner wall of the injection molding part (300) has convex parts (330) and arc-shaped parts (340) alternately distributed in the circumferential direction, the convex parts (330) extend into the recesses (211) and are adapted to the recesses (211), and the arc-shaped parts (340) are connected with the arc-shaped areas (212) in a fit manner; The injection molding part (300) extends to the surface of the pole post 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; The center of the glue injection mark (320), the axis of the injection molding part (300), the axis of the pole post (200), and one of the symmetric lines of the guide plane (2111) are located on the plane where the glue collecting surface (310) is located; The pole post mounting part (100) includes a mounting area surrounding the pole post mounting hole (110), the edge of the second part (220) is opposite to the mounting area, the side wall of the first part (210) is further sleeved with a sealing ring (500), the two opposite surfaces of the sealing ring (500) abut against the mounting area and the second part (220) respectively, and the minimum distance between the recesses (211) and the second part (220) in the axial direction of the pole post (200) is a first distance, and the first distance is greater than the thickness of the sealing ring (500).

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

17. A battery, characterized by A single battery as claimed in any one of claims 1 to 16.

18. An electrical device, comprising: A battery as claimed in claim 17 or a single battery as claimed in any one of claims 1 to 16.

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