Secondary battery and battery pack

Abstract

The utility model discloses a secondary battery and a battery pack, and belongs to the technical field of batteries, the secondary battery comprises a shell, a cover plate assembly, an electrode assembly and an insulating piece, the cover plate assembly comprises a plate body, a plugging piece, a pole and a connecting piece, the plate body has a thickness direction and a length direction, the plate body is connected with the shell and covers a containing cavity, and the plate body is provided with a mounting hole; the plugging piece is connected with the plate body and covers and seals the mounting hole; the pole penetrates through the plate body; the connecting piece is arranged in the accommodating cavity and connected with the pole, part of the connecting piece faces the plugging piece in the thickness direction, and the connecting piece and the plugging piece are spaced to form a first gap; the electrode assembly comprises a tab, and part of the tab is arranged in the first gap and fixedly connected with the connecting piece; the insulating part is arranged in the first gap and fixedly connected with the plugging part. The insulating part is arranged in the first gap, so that the tab and the plugging part can be isolated, short circuit caused by contact between the tab and the plugging part when the secondary battery shakes is avoided, and the reliability of the secondary battery is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to secondary batteries and battery packs. Background Art

[0002] During the installation of some secondary batteries, it is necessary to securely connect the tabs to the connecting pieces through the mounting holes on the top cover, and then use a blocking piece to seal the mounting holes to achieve sealing inside the secondary battery.

[0003] However, after the mounting hole is closed, although there is a gap between the tab and the sealing piece, after the secondary battery shakes, the electrode assembly will move inside the secondary battery, and the tab may contact the sealing piece and cause a short circuit, affecting the reliability of the secondary battery. Utility Model Content

[0004] Purpose of the utility model: The present application provides a secondary battery for solving the technical problem that the tab contacts the sealing member and causes a short circuit; another purpose of the present application is to provide a battery pack.

[0005] Technical solution: This application provides a secondary battery, including:

[0006] A housing having a receiving cavity;

[0007] The cover plate assembly includes a plate body, a blocking piece, a pole and a connecting piece, wherein the plate body has a thickness direction and a length direction, the plate body is connected to the shell and covers the accommodating cavity, the plate body has a mounting hole penetrating the plate body along the thickness direction, the mounting hole is communicated with the accommodating cavity; the blocking piece is connected to the plate body and covers the mounting hole; the pole is provided through the plate body, and the pole and the blocking piece are spaced apart along the length direction; the connecting piece is provided in the accommodating cavity and connected to the pole, a portion of the connecting piece faces the blocking piece along the thickness direction, and a gap is formed between the connecting piece and the blocking piece;

[0008] an electrode assembly disposed in the accommodating cavity, the electrode assembly comprising a body and a tab connected to each other, wherein a portion of the tab is disposed in the gap and fixedly connected to the connecting sheet;

[0009] An insulating member, at least a portion of which is disposed in the gap, located between the tab and the blocking member, and fixedly connected to the blocking member.

[0010] In some embodiments, one of the blocking member and the insulating member has a groove, an opening of the groove faces the other member, and a portion of the other of the blocking member and the insulating member is disposed in the groove.

[0011] In some embodiments, the plate body also has a width direction, and the length direction, the width direction and the thickness direction intersect with each other; one of the sealing member and the insulating member has a first sub-groove and a second sub-groove, the first sub-groove extends along the length direction, and the second sub-groove extends along the width direction, and the first sub-groove is connected to the second sub-groove to form the groove.

[0012] In some embodiments, one of the blocking member and the insulating member has a plurality of the grooves, and the plurality of the grooves are arranged at intervals.

[0013] In some embodiments, the plate body further has a width direction, and the length direction, the width direction, and the thickness direction intersect each other; the plate body has a first surface and a second surface that are opposite to each other along the thickness direction, the first surface and the second surface are opposite to each other, and the second surface faces the accommodating cavity, and the mounting hole passes through the first surface and the second surface; the mounting hole forms a first opening on the first surface, and the mounting hole forms a second opening on the second surface;

[0014] The dimension of the first opening along the length direction is greater than the dimension of the second opening along the length direction, and the dimension of the first opening along the width direction is greater than the dimension of the second opening along the width direction.

[0015] In some embodiments, the plate comprises:

[0016] a main body portion, the main body portion having the first surface and the third surface, the first surface and the third surface being opposite to each other along the thickness direction, the third surface facing the accommodating cavity, and the main body portion further having a first through hole, the first through hole penetrating the first surface and the third surface;

[0017] A protrusion, the protrusion is arranged on the first through hole and is connected to the hole wall of the first through hole; the protrusion has a fourth surface and a fifth surface, the fourth surface is opposite to the fifth surface, the fifth surface faces the accommodating cavity, and is connected to the third surface to form the second surface; the protrusion also has a second through hole running through the fourth surface and the fifth surface, the second through hole and the first through hole are connected along the thickness direction to form the mounting hole.

[0018] In some embodiments, the blocking member comprises:

[0019] a first portion, the first portion having a sixth surface and a seventh surface facing away from each other in a thickness direction, the seventh surface facing the accommodating cavity, and the seventh surface connected to the fourth surface;

[0020] The second portion is connected to the seventh surface, the second portion is passed through the second through hole, and the insulating member is connected to a side of the second portion away from the first portion.

[0021] In some embodiments, the sealing member has the groove; the insulating member includes a first connecting portion and a second connecting portion, the second connecting portion is connected to the side of the first connecting portion away from the electrode assembly along the thickness direction, the first connecting portion is fixedly connected to the sealing member, and the second connecting portion is arranged in the groove.

[0022] In some embodiments, the sealing member has a sixth surface and an eighth surface that are opposite to each other along the thickness direction, and the eighth surface faces the accommodating cavity. The sealing member also includes a side wall, which is located between the sixth surface and the eighth surface and connects the sixth surface and the eighth surface respectively.

[0023] In some embodiments, the secondary battery further includes a separator, at least a portion of which is disposed in the gap, located between the tab and the insulating member, and connected to the tab.

[0024] Correspondingly, the present application also provides an electrical device, comprising a secondary battery as described in any one of the above embodiments.

[0025] Beneficial effect: Compared with the prior art, the secondary battery provided by the embodiment of the present application includes a shell, a cover assembly, an electrode assembly and an insulating member, the shell has a accommodating cavity; the cover assembly includes a plate body, a sealing member, a pole and a connecting piece, the plate body has a thickness direction and a length direction, the plate body is connected to the shell and covers the accommodating cavity, the plate body has a mounting hole that penetrates the plate body along the thickness direction, and the mounting hole is connected to the accommodating cavity; the sealing member is connected to the plate body and covers the mounting hole; the pole is passed through the plate body, and the pole and the sealing member are spaced apart along the length direction; the connecting piece is arranged in the accommodating cavity and connected to the pole, part of the connecting piece faces the sealing member along the thickness direction, and a gap is formed between the connecting piece and the sealing member; the electrode assembly is arranged in the accommodating cavity, the electrode assembly includes a main body and a pole ear that are connected to each other, part of the pole ear is arranged in the gap, and is fixedly connected to the connecting piece; at least part of the insulating member is arranged in the gap, and is located between the pole ear and the sealing member, and is fixedly connected to the sealing member. By providing an insulating member in the first gap, the present application can isolate the tab and the blocking member, preventing the tab and the blocking member from contacting and causing a short circuit when the secondary battery is shaken, thereby improving the reliability of the secondary battery. Furthermore, the present application also secures the insulating member by fixedly connecting the insulating member to the blocking member, thereby preventing the insulating member from falling out of the first gap.

[0026] Correspondingly, the present application also provides a battery pack, which includes the secondary battery of any one of the above embodiments. Since the probability of short circuit in the secondary battery is reduced, the reliability of the battery pack is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0028] Figure 1 A schematic structural diagram of a secondary battery provided in an embodiment of the present application;

[0029] Figure 2 A top view of a secondary battery provided in an embodiment of the present application;

[0030] Figure 3 for Figure 2 Cross-sectional view at AA in the middle;

[0031] Figure 4 for Figure 3 Detailed view of the center frame C;

[0032] Figure 5 for Figure 2 Cross-sectional view at the middle BB;

[0033] Figure 6 for Figure 5 Detailed view of the middle frame D;

[0034] Figure 7 for Figure 6 Detail of the center circle E;

[0035] Figure 8 A schematic diagram of the connection between the sealing member and the insulating member in the secondary battery provided in an embodiment of the present application;

[0036] Figure 9 A schematic structural diagram of a blocking member in some embodiments of the secondary battery provided in the embodiments of the present application;

[0037] Figure 10 A bottom view of a blocking member in some embodiments of the secondary battery provided in the embodiments of the present application;

[0038] Figure 11 A front view of a blocking member in some embodiments of the secondary battery provided in the embodiments of the present application;

[0039] Figure 12 A schematic structural diagram of an insulating member in some embodiments of the secondary battery provided in the embodiments of the present application;

[0040] Figure 13 A front view of an insulating member in some embodiments of the secondary battery provided in the embodiments of the present application;

[0041] Figure 14 Schematic diagram of the structure of the blocking member in other embodiments of the secondary battery provided in the embodiments of the present application;

[0042] Figure 15 Schematic diagram of the structure of the insulating member in other embodiments of the secondary battery provided in the embodiments of the present application;

[0043] Figure 16 Schematic diagram of the structure of the blocking member in some other embodiments of the secondary battery provided in the embodiments of the present application;

[0044] Figure 17 Schematic diagram of the structure of the insulating member in some other embodiments of the secondary battery provided in the embodiments of the present application;

[0045] Figure 18 A schematic structural diagram of a blocking member in some further embodiments of the secondary battery provided in the embodiments of the present application;

[0046] Figure 19 Schematic diagram of the structure of the insulating member in some further embodiments of the secondary battery provided in the embodiments of the present application.

[0047] Reference numerals: 100-shell, 110-accommodating cavity, 111-gap, 200-cover assembly, 210-plate, 211-mounting hole, 212-first surface, 2121-first opening, 213-second surface, 2131-second opening, 214-body, 2141-third surface, 2142-first through hole, 215-protrusion, 2151-fourth surface, 2152-fifth surface, 2153-second through hole, 220-blocking member, 221-groove, 221 1-first sub-groove, 2212-first groove wall, 2213-second sub-groove, 2214-second groove wall, 2215-side wall, 222-first part, 2221-sixth surface, 2222-seventh surface, 223-second part, 2231-eighth surface, 224-protrusion, 230-pole, 240-connecting piece, 300-electrode assembly, 310-body, 320-ear, 400-insulating part, 410-first connecting part, 420-second connecting part, 500-isolating part. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly specified and specifically limited. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0050] It should also be noted that in the drawings of the embodiments of the present application, the arrows marked X, Y, and Z respectively represent the first direction X, the second direction Y, and the third direction Z. The description of the present application introduces the first direction X, the second direction Y, and the third direction Z to more clearly express the relative positional relationship involved in the present application, wherein the first direction X, the second direction Y, and the third direction Z are three relative directions that intersect with each other, rather than absolute directions. In actual applications, the first direction X, the second direction Y, and the third direction Z can point to any direction in space as long as the intersection relationship between the two is maintained.

[0051] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0052] During the installation of some secondary batteries, it is necessary to securely connect the tabs to the connecting pieces through the mounting holes on the top cover, and then use a blocking piece to seal the mounting holes to achieve sealing inside the secondary battery.

[0053] However, after the mounting hole is closed, although there is a gap between the tab and the sealing piece, after the secondary battery shakes, the electrode assembly will move inside the secondary battery, and the tab may contact the sealing piece and cause a short circuit, affecting the reliability of the secondary battery.

[0054] In order to solve the technical problem that the tab contacts the blocking member and causes a short circuit, the first embodiment of the present application provides a secondary battery. Figure 1 、 Figure 2 、 Figure 5 and Figure 6The secondary battery includes a shell 100, a cover assembly 200, an electrode assembly 300 and an insulating member 400, and has a receiving cavity 110; the cover assembly 200 includes a plate body 210, a blocking member 220, a pole 230 and a connecting piece 240, the plate body 210 has a thickness direction X and a length direction Z, the plate body 210 is connected to the shell 100 and covers the receiving cavity 110, the plate body 210 has a mounting hole 211 that passes through the plate body 210 along the thickness direction X, and the mounting hole 211 is connected to the receiving cavity 110; the blocking member 220 is connected to the plate body 210 and covers the mounting hole 211; the pole 230 is provided on the plate body 210, and the pole 230 is spaced apart from the blocking piece 220 along the length direction Z; the connecting piece 240 is arranged in the accommodating cavity 110 and is connected to the pole 230, a portion of the connecting piece 240 faces the blocking piece 220 along the thickness direction X, and a gap 111 is formed between the connecting piece 240 and the blocking piece 220; the electrode assembly 300 is arranged in the accommodating cavity 110, and the electrode assembly 300 includes a main body 310 and a pole ear that are connected to each other, a portion of the pole ear is arranged in the gap 111, and is fixedly connected to the connecting piece 240; at least a portion of the insulating member 400 is arranged in the gap 111, and is located between the pole ear and the blocking piece 220, and is fixedly connected to the blocking piece 220.

[0055] The plate body 210 has a first surface 212 and a second surface 213. The first surface 212 and the second surface 213 face away from each other along the thickness direction X, and the second surface 213 faces the accommodating cavity 110. The portion of the connecting piece 240 facing the blocking member 220 along the thickness direction X means that, along the thickness direction X, the orthographic projection of the connecting piece 240 on the plane where the second surface 213 lies overlaps with the orthographic projection of the blocking member 220 on the plane where the second surface 213 lies.

[0056] See also Figure 5 and Figure 7 The gap 111 is relatively small. When the electrode assembly 300 moves relative to and toward the cap plate assembly 200, there is a risk that the tab 320 may contact the blocking member 220, thereby causing a short circuit. In the above embodiment, the insulating member 400 disposed in the gap 111 can isolate the tab 320 from the blocking member 220. Even if the tab 320 moves toward the blocking member 220 driven by the electrode assembly 300, the insulating member 400 will prevent the tab 320 from contacting the blocking member 220. This reduces the possibility of a short circuit caused by contact between the tab 320 and the blocking member 220, thereby improving the reliability of the secondary battery.

[0057] Furthermore, in the above embodiment, the insulating member 400 is connected to the tab 320 to achieve fixation, prevent the insulating member 400 from being separated from the gap 111, and improve the insulation reliability of the insulating member 400. In the production process of the above embodiment, after the tab 320 and the connecting piece 240 are welded, the insulating member 400 is placed into the accommodating cavity 110 through the mounting hole 211, and the insulating member 400 is attached to the tab 320, and then the sealing member 220 is used to seal the mounting hole 211. It is understandable that the welding of the tab 320 and the connecting piece 240 may generate impurities and fall off. However, the insulating member 400 attached to the tab 320 can cover the weld marks and adhere and fix the impurities, preventing the impurities from falling off and causing a short circuit, further reducing the possibility of a short circuit in the secondary battery and further improving the reliability of the secondary battery.

[0058] In some embodiments, one of the blocking member 220 and the insulating member 400 has a groove 221 , the opening of the groove 221 faces the other, and a portion of the other of the blocking member 220 and the insulating member 400 is disposed in the groove 221 .

[0059] Specifically, see Figure 9 and Figure 12 ,in, Figure 9 A blocking piece 220 with a groove 221 is shown, Figure 12 Demonstrated the ability to Figure 9 In some embodiments, the blocking member 220 has a groove 221 , the opening of which faces the insulating member 400 , that is, the groove 221 is provided on the side of the blocking member 220 facing the insulating member 400 , and a portion of the insulating member 400 is embedded in the groove 221 .

[0060] Specifically, see Figure 18 and Figure 19 ,in, Figure 19 An insulating member 400 having a groove 221 is shown, Figure 17 Demonstrated the ability to Figure 19 The insulating member 400 is matched with the blocking member 220. In some embodiments, the insulating member 400 has a groove 221, and the opening of the groove 221 faces the blocking member 220. That is, the groove 221 is provided on the side of the insulating member 400 facing the blocking member 220. The blocking member 220 includes a protrusion 224, which can be embedded in the groove 221 so that the protrusion 224 can connect with the groove wall of the groove 221.

[0061] In the above embodiment, the groove 221 is provided so that a portion of either the blocking member 220 or the insulating member 400 can be embedded in the groove 221, thereby expanding the connection area between the blocking member 220 and the insulating member 400, thereby improving the connection reliability between the blocking member 220 and the insulating member 400. In addition, the groove 221 also allows the blocking member 220 and the insulating member 400 to be mutually restrained, preventing the insulating member 400 from shifting, thereby further improving the reliability of the insulating member 400 in isolating the tab 320 from the blocking member 220.

[0062] In some embodiments, the groove wall of the groove 221 has a limiting surface, which is used to prevent relative rotation between the blocking member 220 and the insulating member 400. In other embodiments, one of the blocking member 220 and the insulating member 400 has multiple grooves 221, and the other of the blocking member 220 and the insulating member 400 is partially embedded in the groove 221 to prevent relative rotation between the blocking member 220 and the insulating member 400.

[0063] In some embodiments, the plate body 210 also has a width direction Y, and the length direction Z, width direction Y and thickness direction X intersect in pairs; one of the sealing member 220 and the insulating member 400 has a first sub-groove 2211 and a second sub-groove 2213, the first sub-groove 2211 extends along the length direction Z, and the second sub-groove 2213 extends along the width direction Y, and the first sub-groove 2211 is connected to the second sub-groove 2213 to form a groove 221.

[0064] Specifically, see Figure 9 , Figure 9 An embodiment is shown in which the blocking member 220 has a first sub-groove 2211 and a second sub-groove 2213. In some embodiments, the blocking member 220 has the first sub-groove 2211 and the second sub-groove 2213. The first sub-groove 2211 and the second sub-groove 2213 face the insulating member 400. The first sub-groove 2211 extends along the length direction Z, and the second sub-groove 2213 extends along the width direction. The first sub-groove 2211 and the second sub-groove 2213 communicate to form the groove 221. The insulating member 400 is partially embedded in the first sub-groove 2211, and the insulating member is partially embedded in the second sub-groove 2213.

[0065] Specifically, in some embodiments, the insulating member 400 has a first sub-groove 2211 and a second sub-groove 2213. The first sub-groove 2211 and the second sub-groove 2213 face the insulating member 400. The first sub-groove 2211 extends along the length direction Z, and the second sub-groove 2213 extends along the width direction. The first sub-groove 2211 and the second sub-groove 2213 communicate to form the groove 221. A portion of the blocking member 220 is embedded in the first sub-groove 2211, and a portion of the insulating member is embedded in the second sub-groove 2213.

[0066] In the above embodiment, by providing the intersecting first sub-groove 2211 and the second sub-groove 2213, a portion of one of the sealing member 220 and the insulating member 400 is simultaneously embedded in the first sub-groove 2211 and the second sub-groove 2213, so as to expand the connection area between the sealing member 220 and the insulating member 400. At the same time, the sealing member 220 and the insulating member 400 can also limit each other to avoid displacement of the insulating member 400, thereby improving the reliability of the insulating member 400.

[0067] In some embodiments, see Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 、 Figure 18 and Figure 19 One of the blocking member 220 and the insulating member 400 has a plurality of grooves 221 , and the plurality of grooves 221 are arranged at intervals.

[0068] In some embodiments, see Figure 14 and Figure 15 The eighth surface 2231 of the blocking member 220 has a plurality of grooves 221 spaced apart and arranged in a ring-like configuration. Correspondingly, the insulating member 400 includes a first connecting portion 410 connected to the eighth surface 2231 and a plurality of second connecting portions 420 embedded in the grooves 221. The plurality of second connecting portions 420 are spaced apart and arranged in a ring-like configuration.

[0069] In some embodiments, see Figure 16 and Figure 17 The eighth surface 2231 of the blocking member 220 has a plurality of grooves 221, which are spaced apart. Portions of the plurality of grooves 221 are spaced apart along the length direction Z, portions of the plurality of grooves 221 are spaced apart along the width direction Y, and portions of the plurality of grooves 221 are spaced apart in a direction oblique to the length direction Z and the width direction Y. Correspondingly, the insulating member 400 includes a first connecting portion 410 connected to the eighth surface 2231 and a plurality of second connecting portions 420 embedded in the grooves 221. The plurality of second connecting portions 420 are spaced apart, portions of the plurality of second connecting portions 420 are spaced apart along the length direction Z, portions of the plurality of second connecting portions 420 are spaced apart along the width direction Y, and portions of the plurality of second connecting portions 420 are spaced apart in a direction oblique to the length direction Z and the width direction Y.

[0070] In some embodiments, see Figure 18 and Figure 19The eighth surface 2231 of the blocking member 220 is connected to a plurality of protrusions 224. The protrusions 224 are spaced apart, with portions of the protrusions 224 spaced apart along the length direction Z, portions of the protrusions 224 spaced apart along the width direction Y, and portions of the protrusions 224 spaced apart along a direction oblique to the length direction Z and the width direction Y. Correspondingly, the insulating member 400 has a plurality of grooves 221 opening toward the blocking member 220. The grooves 221 are spaced apart, with portions of the grooves 221 spaced apart along the length direction Z, portions of the grooves 221 spaced apart along the width direction Y, and portions of the grooves 221 spaced apart along a direction oblique to the length direction Z and the width direction Y. The protrusions 224 are embedded in the grooves 221.

[0071] In the above embodiment, the provision of multiple grooves 221 further increases the connection area between the blocking member 220 and the insulating member 400, thereby further improving the reliability of the blocking member 220 and the insulating member 400. Furthermore, the provision of multiple, spaced grooves 221 further prevents relative rotation between the blocking member 220 and the insulating member 400.

[0072] In some embodiments, see Figure 4 and Figure 7 The plate body 210 also has a width direction Y, and the length direction Z, the width direction Y and the thickness direction X intersect in pairs; the plate body 210 has a first surface 212 and a second surface 213 that are opposite to each other along the thickness direction X, the first surface 212 and the second surface 213 are opposite to each other, and the second surface 213 faces the accommodating cavity 110, and the mounting hole 211 passes through the first surface 212 and the second surface 213; the mounting hole 211 forms a first opening 2121 on the first surface 212, and the mounting hole 211 forms a second opening 2131 on the second surface 213; wherein, the size of the first opening 2121 along the length direction Z is greater than the size of the second opening 2131 along the length direction Z, and the size of the first opening 2121 along the width direction Y is greater than the size of the second opening 2131 along the width direction Y.

[0073] In the above embodiment, the size of the second opening 2131 is smaller than that of the first opening 2121, which prevents the blocking member 220 from passing through the second opening 2131. During installation, when using the blocking member 220 to block the mounting hole 211, the blocking member 220 is simply placed on the wall of the mounting hole 211 before welding the blocking member 220 to the plate 210. Because the blocking member 220 cannot pass through the second opening 2131, it will not fall into the accommodating cavity 110, reducing the difficulty of securing the blocking member 220 during welding.

[0074] In some embodiments, the wall of the mounting hole 211 is a conical surface, and the corresponding blocking member 220 is a truncated cone. In other embodiments, the wall 216 of the mounting hole 211 is a quadrangular pyramid, and the corresponding blocking member 220 is a quadrangular pyramid. In still other embodiments, the mounting hole 211 is a countersunk hole.

[0075] In some embodiments, please refer again to Figure 4 and Figure 7 The plate 210 includes a main body 214 and a protruding portion 215. The main body 214 has a first surface 212 and a third surface 2141. The first surface 212 and the third surface 2141 are separated along the thickness direction X. The third surface 2141 faces the accommodating cavity 110. The main body 214 also has a first through hole 2142. The first through hole 2142 passes through the first surface 212 and the third surface 2141. The protruding portion 215 is provided in the first through hole 2142 and is aligned with the first through hole 2142. The protrusion 215 has a fourth surface 2151 and a fifth surface 2152, the fourth surface 2151 and the fifth surface 2152 are opposite to each other, the fifth surface 2152 faces the accommodating cavity 110, and is connected to the third surface 2141 to form a second surface 213; the protrusion 215 also has a second through hole 2153 running through the fourth surface 2151 and the fifth surface 2152, the second through hole 2153 and the first through hole 2142 are connected along the thickness direction X to form a mounting hole 211.

[0076] It is understood that because the protrusion 215 is disposed in the first through-hole 2142 and the fifth surface 2152 is connected to the third surface 2141 to form the second surface 213, the portion of the mounting hole 211 away from the accommodating cavity 110 is formed by the first through-hole 2142 with a larger aperture, while the portion closer to the accommodating cavity 110 is formed by the second through-hole 2153 with a smaller aperture. In other words, the mounting hole 211 is a countersunk hole formed by the first through-hole 2142 and the second through-hole 2153 communicating with each other.

[0077] In the above embodiment, when the blocking member 220 needs to be welded, the blocking member 220 is placed on the plate body 210. The blocking member 220 is preferentially restrained by the wall of the second through hole 2153, which is closer to the center. This achieves automatic centering, reducing the difficulty of welding the blocking member 220. Simultaneously, the blocking member 220 contacts and is restrained by the stepped surface in the countersunk hole, namely, the seventh surface 2222. No additional fixing is required, and the blocking member 220 will not fall into the accommodating cavity 110, further reducing the difficulty of welding the blocking member 220.

[0078] In addition, it can be understood that when the sealing member 220 is welded to the plate body 210, the melting area is located on the side of the fourth surface 2151 away from the electrode assembly 300, and is far away from the insulating member 400 located in the gap 111. The welding temperature has little effect on the insulating member 400, and the reliability of the insulating member 400 is higher.

[0079] In some embodiments, please refer again to Figure 7 and Figure 8 The sealing member 220 includes a first portion 222 and a second portion 223. The first portion 222 has a sixth surface 2221 and a seventh surface 2222 that are opposite to each other along the thickness direction X. The seventh surface 2222 faces the accommodating cavity 110, and the seventh surface 2222 is connected to the fourth surface 2151; the second portion 223 is connected to the seventh surface 2222, and the second portion 223 is passed through the second through hole 2153. The insulating member 400 is connected to the side of the second portion 223 away from the first portion 222.

[0080] It can be understood that when the mounting hole 211 is a countersunk hole, the first part 222 and the second part 223 of the sealing member 220 can be respectively arranged at different positions of the mounting hole 211, so as to obtain a longer sealing distance, thereby enabling the sealing member 220 to better seal the mounting hole 211, so that the secondary battery has better reliability.

[0081] In some embodiments, see Figure 11 Along the thickness direction X, the first portion 222 has a thickness of H1 mm, and the second portion 223 has a thickness of H2 mm, satisfying: 0.75≤H1≤1.5, 0.5≤H2≤1.

[0082] Specifically, the value of H1 can be any one of 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, and 1.5, or a range between any two of these values. When the value of H1 is small, the mass of the blocking member 220 is small, and the mechanical properties of the plate 210 are good. When the value of H1 is large, the depth of the molten zone during welding is deep, and the connection between the blocking member 220 and the plate 210 is more reliable.

[0083] Specifically, the value of H2 can be any one of 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, and 1.0, or a range between any two values. When the value of H2 is relatively small, the blocking member 220 can be prevented from extending into the accommodating cavity 110, thereby avoiding occupying the space of the accommodating cavity 110 and improving space utilization. When the value of H2 is relatively large, the blocking member 220 can be ensured to cover the wall of the mounting hole 211, thereby preventing the wall of the mounting hole 211 from contacting the tab and causing a short circuit, thereby improving reliability.

[0084] In the above embodiment, when the values of H1 and H2 are both within the range defined in the embodiment of the present application, the secondary battery can obtain better reliability and the space utilization rate inside the accommodating cavity 110 can be improved.

[0085] In some embodiments, see Figure 13 , the blocking member 220 has a groove 221; the insulating member 400 includes a first connecting portion 410 and a second connecting portion 420, the second connecting portion 420 is connected to the side of the first connecting portion 410 away from the electrode assembly 300 along the thickness direction X, the first connecting portion 410 is fixedly connected to the blocking member 220, and the second connecting portion 420 is arranged in the groove 221; wherein, along the thickness direction X, the first connecting portion 410 has a thickness H3 mm, and the second connecting portion 420 has a thickness H4 mm, satisfying: 0.4≤H3≤0.6, 0.4≤H4≤0.6.

[0086] Specifically, the value of H3 can be any one of 0.45, 0.5, 0.55, and 0.6, or a range between any two values. When the value of H3 is small, the insulating member 400 occupies less space in the receiving cavity 110, and the space utilization rate of the secondary battery is improved. When the value of H3 is large, the insulating member 400 has better insulation performance and the secondary battery is more reliable.

[0087] Specifically, the value of H4 can be any one of 0.45, 0.5, 0.55, and 0.6, or a range between any two values. When the value of H4 is small, the connection between the insulating member 400 and the blocking member 220 is easier. When the value of H4 is large, the connection area between the insulating member 400 and the blocking member 220 is larger, the connection between the insulating member 400 and the blocking member 220 is more reliable, and the insulating member 400 is less likely to fall off.

[0088] In the above embodiment, when the values of H3 and H4 are both within the range defined by the embodiment of the present application, the secondary battery can obtain better space utilization and better reliability. At the same time, the connection difficulty between the sealing member 220 and the insulating member 400 is also relatively low.

[0089] In some embodiments, see Figure 10 The first sub-groove 2211 includes two first groove walls 2212 arranged opposite to each other along the width direction Y, and the two first groove walls 2212 have a maximum spacing D1 mm along the width direction Y; the second sub-groove 2213 includes two second groove walls 2214 arranged opposite to each other along the length direction Z, and the two second groove walls 2214 have a maximum spacing D2 mm along the length direction Z; satisfying: 0.4≤D1≤0.6, 0.4≤D2≤0.6.

[0090] Specifically, the value of D1 can be any one of 0.45, 0.5, 0.55, and 0.6, or a range between any two of these values. A smaller value of D1 can reduce the difficulty of forming the first sub-groove 2211 on the blocking member 220. A larger value of D1 can further expand the connection area between the blocking member 220 and the insulating member 400, improving connection reliability.

[0091] Similarly, the value of D2 can be any one of 0.45, 0.5, 0.55, and 0.6, or a range between any two values. A smaller value of D2 can reduce the difficulty of forming the first sub-groove 2211 on the blocking member 220. A larger value of D2 can further expand the connection area between the blocking member 220 and the insulating member 400, improving connection reliability.

[0092] In the above embodiment, when the values of D1 and D2 are both within the range defined in the embodiment of the present application, the secondary battery can achieve lower manufacturing difficulty and better connection reliability between the sealing member 220 and the insulating member 400.

[0093] In some embodiments, please refer again to Figure 10 The blocking member 220 has a sixth surface 2221 and an eighth surface 2231 that are opposite to each other along the thickness direction X, and the eighth surface 2231 faces the accommodating cavity 110. The blocking member 220 also includes a side wall 2215, which is located between the sixth surface 2221 and the eighth surface 2231 and connects the sixth surface 2221 and the eighth surface 2231 respectively; wherein, along the length direction Z, there is a minimum dimension T1 mm between the groove wall of the first sub-groove 2211 and the side wall 2215; along the width direction Y, there is a minimum dimension T2 mm between the groove wall of the second sub-groove 2213 and the side wall 2215; and the following conditions are satisfied: 1≤T1≤3, 1≤T2≤3.

[0094] Specifically, the value of T1 can be any one of 0.45, 0.5, 0.55, and 0.6, or a range between any two values. When the value of T1 is small, the first sub-groove 2211 can be further enlarged to increase the connection area between the blocking member 220 and the insulating member 400, thereby improving connection reliability. When the value of T1 is large, a sufficient safety distance can be maintained between the first sub-groove 2211 and the edge of the blocking member 220, thereby improving the yield rate of the blocking member 220 and reducing the manufacturing difficulty of the blocking member 220.

[0095] Similarly, the value of T2 can be any one of 0.45, 0.5, 0.55, and 0.6, or a range between any two values. When the value of T2 is small, the second sub-groove 2213 can be further enlarged to increase the connection area between the blocking member 220 and the insulating member 400, thereby improving connection reliability. When the value of T2 is large, a sufficient safe distance can be maintained between the second sub-groove 2213 and the edge of the blocking member 220, thereby improving the yield rate of the blocking member 220 and reducing the manufacturing difficulty of the blocking member 220.

[0096] In the above embodiment, when the values of T1 and T2 are both within the range defined in the embodiment of the present application, the secondary battery can achieve lower manufacturing difficulty and better connection reliability between the sealing member 220 and the insulating member 400.

[0097] In some embodiments, see Figure 2 , along the width direction Y, the first opening 2121 has a maximum dimension D3 mm, and the second opening 2131 has a maximum dimension D4 mm, satisfying: 2≤D3-D4≤3;

[0098] Along the length direction Z, the first opening 2121 has a maximum dimension D5 mm, and the second opening 2131 has a maximum dimension D6 mm, satisfying: 2≤D5-D6≤3.

[0099] Specifically, the value of D3-D4 can be any one of 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, or 3, or a range between any two values. When the value of D3-D4 is small, the opening area of the mounting hole 211 can be reduced, thereby improving the mechanical properties of the plate 210. When the value of D3-D4 is large, the positioning and limiting effects of the mounting hole 211 can be improved, thereby reducing the difficulty of welding the sealing member 220.

[0100] Similarly, the value of D5-D6 can be any one of 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, or 3, or a range between any two values. When the value of D5-D6 is small, the opening area of the mounting hole 211 can be reduced, thereby improving the mechanical properties of the plate 210. When the value of D5-D6 is large, the positioning and limiting effects of the mounting hole 211 can be improved, thereby reducing the difficulty of welding the sealing member 220.

[0101] In the above embodiment, when the values of D3-D4 and D5-D6 are both within the range defined by the embodiment of the present application, the plate body 210 can not only obtain better mechanical properties, but also enable the sealing member 220 and the insulating member 400 to obtain better connection reliability.

[0102] In some embodiments, please refer again to Figure 4 The secondary battery further includes a separator 500 , at least a portion of which is disposed in the gap 111 , located between the tab and the insulating member 400 , and connected to the tab.

[0103] In the above embodiment, the isolation member 500 located in the gap 111 can further isolate the blocking member 220 and the tab 320 to further reduce the possibility of the blocking member 220 and the tab 320 contacting and causing a short circuit, thereby further improving the reliability of the secondary battery.

[0104] Correspondingly, the present application also provides a battery pack, which includes the secondary battery of any one of the above embodiments. Since the probability of short circuit in the secondary battery is reduced, the reliability of the battery pack is higher.

[0105] The above is a detailed introduction to a secondary battery and a battery pack provided in the embodiments of the present application. Specific examples are used in the present application to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A secondary battery, characterized in that: The secondary battery includes: A housing having a receiving cavity; The cover plate assembly includes a plate body, a blocking piece, a pole and a connecting piece, wherein the plate body has a thickness direction and a length direction, the plate body is connected to the shell and covers the accommodating cavity, the plate body has a mounting hole penetrating the plate body along the thickness direction, the mounting hole is communicated with the accommodating cavity; the blocking piece is connected to the plate body and covers the mounting hole; the pole is provided through the plate body, and the pole and the blocking piece are spaced apart along the length direction; the connecting piece is provided in the accommodating cavity and connected to the pole, a portion of the connecting piece faces the blocking piece along the thickness direction, and a gap is formed between the connecting piece and the blocking piece; an electrode assembly disposed in the accommodating cavity, the electrode assembly comprising a body and a tab connected to each other, wherein a portion of the tab is disposed in the gap and fixedly connected to the connecting sheet; An insulating member, at least a portion of which is disposed in the gap, located between the tab and the blocking member, and fixedly connected to the blocking member.

2. The secondary battery according to claim 1, wherein One of the blocking member and the insulating member has a groove, an opening of the groove faces the other member, and a portion of the other of the blocking member and the insulating member is disposed in the groove.

3. The secondary battery according to claim 2, wherein The plate body also has a width direction, and the length direction, the width direction and the thickness direction intersect with each other; one of the sealing member and the insulating member has a first sub-groove and a second sub-groove, the first sub-groove extends along the length direction, and the second sub-groove extends along the width direction, and the first sub-groove is connected to the second sub-groove to form the groove.

4. The secondary battery according to claim 2, wherein: One of the blocking member and the insulating member has a plurality of the grooves, and the plurality of the grooves are arranged at intervals.

5. The secondary battery according to claim 1, wherein The plate body further has a width direction, and the length direction, the width direction, and the thickness direction intersect each other; the plate body has a first surface and a second surface that are opposite to each other along the thickness direction, the first surface and the second surface are opposite to each other, and the second surface faces the accommodating cavity, and the mounting hole passes through the first surface and the second surface; the mounting hole forms a first opening on the first surface, and the mounting hole forms a second opening on the second surface; The dimension of the first opening along the length direction is greater than the dimension of the second opening along the length direction, and the dimension of the first opening along the width direction is greater than the dimension of the second opening along the width direction.

6. The secondary battery according to claim 5, characterized in that The plate body comprises: a main body portion, the main body portion having the first surface and the third surface, the first surface and the third surface being opposite to each other along the thickness direction, the third surface facing the accommodating cavity, and the main body portion further having a first through hole, the first through hole penetrating the first surface and the third surface; A protrusion, the protrusion is arranged on the first through hole and is connected to the hole wall of the first through hole; the protrusion has a fourth surface and a fifth surface, the fourth surface is opposite to the fifth surface, the fifth surface faces the accommodating cavity, and is connected to the third surface to form the second surface; the protrusion also has a second through hole running through the fourth surface and the fifth surface, the second through hole and the first through hole are connected along the thickness direction to form the mounting hole.

7. The secondary battery according to claim 6, characterized in that The blocking member comprises: a first portion, the first portion having a sixth surface and a seventh surface facing away from each other in a thickness direction, the seventh surface facing the accommodating cavity, and the seventh surface connected to the fourth surface; The second portion is connected to the seventh surface, the second portion is passed through the second through hole, and the insulating member is connected to a side of the second portion away from the first portion.

8. The secondary battery according to claim 2, wherein The sealing member has the groove; the insulating member includes a first connecting portion and a second connecting portion, the second connecting portion is connected to the side of the first connecting portion away from the electrode assembly along the thickness direction, the first connecting portion is connected to the sealing member, and the second connecting portion is arranged in the groove.

9. The secondary battery according to claim 3, wherein The blocking member has a sixth surface and an eighth surface that are opposite to each other along the thickness direction, and the eighth surface faces the accommodating cavity. The blocking member also includes a side wall, which is located between the sixth surface and the eighth surface and connects the sixth surface and the eighth surface respectively.

10. The secondary battery according to claim 1, wherein The secondary battery further includes a separator, at least a portion of which is disposed in the gap, located between the tab and the insulating member, and connected to the tab.

11. A battery pack, characterized in that: The invention comprises the secondary battery according to any one of claims 1 to 10.

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