Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack, the single battery comprises a shell and a connecting piece, and the shell is provided with a liquid injection hole; the connecting piece is riveted and fixed with the shell so as to seal the liquid injection hole; the connecting piece comprises a first connecting part and a second connecting part, at least part of the first connecting part is located in the liquid injection hole, a protruding part is arranged on the second connecting part, the second connecting part is fixedly connected to the outer wall of the shell, and the protruding part surrounds the liquid injection hole. The connecting piece is directly fixed to the shell in a pull riveting mode, the protruding part is arranged on the second connecting part of the connecting piece, the fixed connecting area between the second connecting part and the shell is reduced through the protruding part, and therefore the larger pressure intensity effect is obtained in the riveting process, the second connecting part is tightly attached to the shell, and the connecting piece is more stable. And the liquid injection hole is effectively sealed by virtue of a structure that the bulge part surrounds the liquid injection hole.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a single cell battery and a battery pack. Background Technology

[0002] Battery filler hole riveting seal is a technology used in battery manufacturing to seal filler holes. It is simple to operate, low in cost, and provides good sealing performance, making it widely used in current battery filler hole sealing. Riveting seals require fixing the sealing element to the housing via riveting. However, existing seals often suffer from poor sealing reliability due to operational differences during the connection process, resulting in poor sealing of the filler hole and potential seal failure.

[0003] Therefore, how to improve the riveting sealing effect of the sealing component on the battery injection hole is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a single battery cell and a battery pack to increase the battery capacity and maintain its sealing effect.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A single-cell battery, comprising:

[0007] The casing has a liquid injection port.

[0008] A connector is riveted to the housing to seal the injection hole; the connector includes a first connecting part and a second connecting part, at least a portion of the first connecting part is located in the injection hole, the second connecting part is provided with a protrusion, and the second connecting part is fixedly connected to the outer wall of the housing, the protrusion surrounding the injection hole.

[0009] As can be seen from the above technical solution, one aspect of this disclosure provides a single-cell battery. The battery casing has an injection hole, and a connector is riveted to the casing to seal the injection hole. Specifically, the connector includes a first connecting portion and a second connecting portion. At least a portion of the first connecting portion extends into the casing from the injection hole, deforming during riveting to lock the connector to the inner wall of the casing. Simultaneously, the second connecting portion is located outside the casing to lock with it from the outside, thus fixing the connector. Furthermore, the second connecting portion has a protrusion. This protrusion connects the second connecting portion to the outer wall of the casing, reducing the contact area between the second connecting portion and the casing. Under fixed riveting force, reducing the contact area allows the protrusion to exert greater pressure, effectively fitting against the end face. The protrusion's surrounding effect on the injection hole also achieves effective sealing of the injection hole's outer periphery, resulting in convenient operation and a good sealing effect.

[0010] In another aspect of this disclosure, a battery pack is also provided, which includes a housing and the single battery cell provided in the above embodiments. Since the single battery cell possesses the aforementioned effects, the battery pack also possesses the aforementioned effects. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A schematic diagram of the riveting of a single battery casing and a connector provided in an embodiment of this utility model;

[0013] Figure 2 This is a schematic diagram of the assembly structure of the shell and connector provided in one embodiment of the present utility model;

[0014] Figure 3 for Figure 1 A front view of a single cell in the image;

[0015] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of a single AA cell in the diagram;

[0016] Figure 5 for Figure 4 Detailed view of the structure of area B in the image;

[0017] Figure 6 This is a schematic diagram of the structure around the injection hole after the connector is riveted to the housing according to an embodiment of the present invention;

[0018] Figure 7 for Figure 5 A schematic diagram of the connecting component structure in the diagram;

[0019] Figure 8 for Figure 6 A schematic diagram of the connecting component structure in the diagram;

[0020] Figure 9 A schematic diagram of the end face structure of a single battery casing provided in an embodiment of this utility model;

[0021] Figure 10 This is a schematic diagram of a connector structure with a sealing ring provided in an embodiment of the present invention;

[0022] Figure 11 for Figure 10 A front view;

[0023] Figure 12 for Figure 11 Schematic diagram of the CC cross-section structure of the connecting component;

[0024] Figure 13 This is a schematic diagram of a connector structure with a sealing element provided in an embodiment of the present invention.

[0025] in:

[0026] 10-Shell; 110-End face; 120-Recessed area; 130-Injection hole;

[0027] 20 - Connector; 210 - First connecting part; 220 - Second connecting part; 2210 - Protrusion; 2220 - Sealing ring; 2230 - Seal;

[0028] 30-Rivet head. Detailed Implementation

[0029] The core of this application is to disclose a single battery cell and a battery pack to increase battery capacity while maintaining its sealing effect.

[0030] To enable those skilled in the art to better understand the present application, embodiments of the present application will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model described in the claims. Additionally, the complete content of the structures represented in the following embodiments is not limited to those necessary for the solution of the utility model described in the claims.

[0031] like Figure 1As shown, one aspect of this disclosure provides a single-cell battery, which mainly includes a housing 10 and a connector 20. The housing 10 is the main housing structure of the single-cell battery, and the battery cell is arranged inside it. An injection hole 130 is provided on the housing 10, and the connector 20 is riveted and fixed to the housing 10 to seal the injection hole 130. For ease of description, as... Figure 1 As shown, this embodiment describes a structure where the injection hole 130 is located on one end face 110 of the housing 10. It should be noted that the injection hole 130 can also be located on other end faces or sidewalls of the housing 10. Specifically, the connector 20 includes an integral first connecting portion 210 and a second connecting portion 220, wherein at least a portion of the first connecting portion 210 passes through the injection hole 130 to extend into the interior of the housing 10. It should also be noted that, as... Figure 5 and Figure 7 As shown, before the riveting deformation, the outer diameter of the first connecting portion 210 of the connector 20 is not greater than the diameter of the injection hole 130, so that the first connecting portion 210 can pass through the injection hole 130, while ensuring that the rivet head 30 can be smoothly inserted into the first connecting portion 210; typically, in the embodiments provided in this disclosure, the dimension between the outer diameter of the first connecting portion 210 and the inner wall of the injection hole 130 before the riveting deformation is 0.05mm-0.5mm, to ensure the smooth insertion of the first connecting portion 210, while... Figure 6 and Figure 8 As shown, the connector 20 deforms after the rivet head 30 performs the riveting action, that is, the first connecting part 210 deforms so that its outer diameter is larger than the diameter of the injection hole 130, and is locked inside the housing 10 and the inner side of the end face 110, ensuring that the connector 20 cannot be pulled out from the position of the injection hole 130.

[0032] Furthermore, it should be noted that the first connecting part 210 can be a cylindrical structure with a uniform cross-section before riveting deformation, so that its entire area can pass through the injection hole 130 and extend into the interior of the housing 10. At the same time, the first connecting part 210 can also be a structure with a variable cross-section before riveting deformation, such as a stepped cylindrical structure or a frustum structure with a linearly changing cross-section, so that the part of the first connecting part 210 with a cross-sectional outer diameter smaller than the injection hole 130 extends into the interior of the housing 10 through the injection hole 130 and locks with the inner side of the end face 110 inside the housing 10 during riveting deformation. The part of the first connecting part 210 with a cross-sectional outer diameter larger than the injection hole 130 directly abuts against the end face 110 from the outer side, thereby achieving the locking of the connector 20 with the outer side of the end face 110.

[0033] Based on this, the outer diameter of the second connecting part 220 is larger than the diameter of the injection hole 130, so that it can be locked to the outer side of the end face 110, and cooperate with the first connecting part 210 to lock the connector 20 and the housing 10 at the position of the injection hole 130. Meanwhile, as Figure 7 and Figure 8 As shown, the second connecting portion 220 is also provided with a protrusion 2210. The protrusion 2210 is specifically provided on the side of the second connecting portion 220 facing the end face 110 of the housing 10, and protrudes from the end face 110 of the second connecting portion 220. The protrusion 2210 is provided around the injection hole 130 so that after being riveted and locked with the end face 110 of the housing 10, the injection hole can be sealed from the outer periphery of the injection hole 130. It should be noted that in this embodiment, the contact seal between the connector 20 and the housing 10 is directly achieved during the riveting process. However, for the second connecting part 220, its mating method with the end face 110 of the housing 10 is a planar mating with a large contact area. Therefore, directly sealing the second connecting part 220 with the end face 110 will have many problems. For example, a large difference in flatness between the two mating planes will directly lead to seal failure. Furthermore, under the premise of a certain riveting force, a large planar contact will disperse the force of the riveting process, resulting in a decrease in the mating force of the two planes. The present invention provides a protrusion 2210 on the second connecting part 220. The connecting member 20 contacts the end face 110 of the housing 10 through the protrusion 2210, which reduces the contact area between the connecting member 20 and the end face 110. Thus, under the premise of a certain riveting force, the riveting force is concentrated at the protrusion 2210, so that the protrusion 2210 can be tightly pressed to the outside of the end face 110, and the structure of the protrusion 2210 surrounding the outer periphery of the injection hole 130 achieves the sealing of the outer periphery of the injection hole 130.

[0034] In the embodiments provided in this disclosure, the shell 10 can be made of aluminum, aluminum alloy, such as aluminum-manganese alloy, aluminum-magnesium alloy, etc.; it can also be made of steel and stainless steel, such as carbon steel, nickel-plated steel, etc.; or titanium; titanium alloy, etc.

[0035] The single battery cell specifically includes a casing 10 and a cell disposed inside the casing 10. The cell is formed by stacking a positive electrode sheet, a negative electrode sheet, and a separator disposed between the two. The positive electrode sheet includes a positive current collector and a positive active material. The positive current collector can be made of metal materials such as aluminum foil, nickel foil, and stainless steel, or a composite foil formed by combining metal and insulating materials. The positive active material includes a positive active material, a conductive agent, and a binder. The positive active material includes one or more of lithium-containing positive active materials such as lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate. Similarly, the negative electrode sheet includes a negative current collector and a negative active material. The negative current collector can be made of metal materials such as copper foil, aluminum foil, and stainless steel, or a composite foil formed by combining metal and insulating materials. The negative active material includes a negative active material, a conductive agent, and a binder. The negative active material includes one or more of negative active materials such as artificial graphite, natural graphite, silicon carbide, silicon oxide, and lithium titanate.

[0036] Furthermore, in some embodiments of this disclosure, a recessed area 120 is also provided on the housing 10 facing inwards, and as... Figure 2 and Figure 9 As shown, the liquid injection hole 130 on the single cell is formed within the recessed area 120, that is, the liquid injection hole 130 is located in the bottom area of ​​the recessed area 120. The recessed area 120 is used to provide accommodating space for the connector 20. That is, in the direction perpendicular to the liquid injection hole 130, at least a portion of the structure of the second connector 220 is located inside the recessed area 120, so as to reduce the amount of protrusion of the connector 20 relative to the end face 110 of the housing 10 and improve the uniformity of the single cell structure.

[0037] To further optimize the above technical solution, enabling the connector 20 to form an embedded assembly based on the housing 10 without affecting the stacking of multiple individual cells, specifically, in some embodiments of this disclosure, in the direction perpendicular to the end face 110, the side of the second connector 220 facing away from the first connector 210 is flush with the end face 110, such as... Figure 6 As shown, after the connector 20 is riveted and fixed to the housing 10, the height of the connector 20 protruding from the bottom surface of the recessed area 120 towards the outside of the housing 10 is equal to the depth of the recessed area 120, so that the connector 20 completely fills the recessed area 120 in the direction perpendicular to the end face 110. On this basis, after the housing 10 of the single cell is fixedly connected to the connector 20, there is no protruding structure on the end face 110 of the housing 10, so that the end faces 110 of the housings 10 of multiple single cells can be stacked on each other, or jointly attached to other structures such as cold plates or box walls, without affecting the convenience of stacking and assembling single cells due to the protrusion of the connector 20 in the recessed area 120.

[0038] It should also be noted that in some other embodiments of this disclosure, in the direction perpendicular to the end face 110, the side of the second connecting portion 220 facing away from the first connecting portion 210 is recessed in the end face 110. That is, after the connector 20 is riveted and fixed to the housing 10, the height of the protrusion of the connector 20 on the bottom surface of the recessed area 120 towards the outside of the housing 10 is less than the depth of the recessed area 120, so that the connector 20 will not affect the overall flatness of the end face 110 of the housing 10, and the same convenient stacking and assembly of single cells is achieved as in the aforementioned embodiments.

[0039] In the aforementioned two sets of embodiments, for the structure where the side of the second connecting portion 220 facing away from the first connecting portion 210 is recessed into the end face 110, when the end face 110 of the single battery casing 10 serves as the contact surface, assembly is achieved solely through the area of ​​the end face 110 excluding the recessed area 120 serving as the abutment surface; while in the embodiment where the side of the second connecting portion 220 facing away from the first connecting portion 210 is flush with the end face 110, while the area of ​​the end face 110 excluding the recessed area 120 serves as the abutment surface, the connection... The second connecting portion 220 of component 20 faces away from the first connecting portion 210 and can serve as a contact point within the recessed area 120 and as an abutment point on the same plane as the end face 110, thereby improving the assembly stability of the upper end face 110 side of the housing 10. However, at the same time, its assembly precision requirements are high. In actual assembly conditions, the assembly structure of the connector 20 in the recessed area 120 can be selected according to the requirements of the stacking stability of the battery cells and the assembly difficulty requirements of the housing 10 and the connector 20.

[0040] It should be noted that, in another embodiment of this disclosure, the top of the protrusion 2210, that is, the side of the protrusion 2210 facing the end face 110, can be provided with a weak structure with lower strength, so as to deform and extend to both sides during the riveting process, thereby further improving the sealing effect of the protrusion 2210 on the periphery of the injection hole 130.

[0041] Furthermore, in some embodiments of this disclosure, such as Figure 7 and Figure 8As shown, the second connecting portion 220 forms an annular structure on the side facing the injection hole 130 due to the presence of the first connecting portion 210. On the side of the second connecting portion 220 facing the injection hole 130, the ratio of the width of the protrusion 2210 to the width of the second connecting portion 220 is 0.25-0.75. It should be noted that 0.25-0.75 is the range of the ratio of the width of the protrusion 2210 to the width of the second connecting portion 220. This ratio can be any value from 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, to 0.75. Simultaneously, the width of the protrusion 2210 ranges from 0.25mm to 0.3mm, while the width of the second connecting portion 220 ranges from 1mm to 4mm; the widths of both simply satisfy the corresponding ratio range. It should be noted that the ratio of the width of the protrusion 2210 to the width of the second connecting part 220 represents the area ratio of the protrusion 2210 on the annular surface of the second connecting part 220. If the area ratio of the protrusion 2210 on the annular surface of the second connecting part 220 is too large, the protrusion 2210 will have a large contact area with the end face 110. During the riveting process, the excessively large contact area will result in poor planar alignment and insufficient pressing force, thus affecting the sealing effect of the protrusion 2210 on the injection hole 130. On the other hand, if the area ratio of the protrusion 2210 on the annular surface of the second connecting part 220 is too small, the protrusion 2210 will have a good pressing effect under the riveting force, but there is a risk that the thickness of the protrusion 2210 is too small, and the circumferential part will deform and break during the pressing process, leading to the failure of the continuous structure of the protrusion 2210, which will also result in the sealing failure of the injection hole 130. When the ratio is within the range of 0.25-0.75, the protrusion 2210 can maintain the pressing effect during the riveting process, while avoiding the circumferential continuity problem caused by pressing failure, thus ensuring the sealing effect of the injection hole 130.

[0042] It should be further explained that, in the embodiments provided in this disclosure, the protrusion 2210 is arranged around the injection hole 130 to achieve a tight seal of the injection hole 130 by making close contact with the end face 110 during the riveting process. The protrusion 2210 can be set with any structure, such as rectangular, rhomboid, elliptical, etc., as long as it surrounds the injection hole 130. In order to improve the sealing effect of the injection hole 130, in some embodiments of this disclosure, considering the circular hole structure of the injection hole 130, the protrusion 2210 is set as a ring structure to surround the injection hole 130. At the same time, the protrusion 2210 and the injection hole 130 are concentrically arranged so that the inner diameter of the protrusion 2210 in the circumferential direction is uniform with the outer diameter of the injection hole 130, thereby achieving a more uniform sealing effect on the injection hole 130. In conjunction with the aforementioned embodiments, after the connector 20 is riveted and fixed, it forms a concentric ring structure with the injection hole 130, so that the protrusion 2210 forms an equally spaced annular sealing area on the outer periphery of the injection hole 130 after riveting. Compared with a rectangular or other sealing area with sharp corners, it can have a more uniform structural thickness in the circumferential direction, and cooperate with the first connecting part 210 located inside the housing 10 to achieve fixation on the housing 10 and uniform sealing of the injection hole 130.

[0043] Based on the above embodiments, after the connector 20 and the housing 10 are riveted together, the distance between the inner diameter of the protrusion 2210 and the outer diameter of the injection hole 130 is 0.1mm-3.6mm. It should be noted that the protrusion 2210 is used to make close contact with the outer side of the end face 110 under the pressure of the riveting force to seal the injection hole 130. If the distance between the inner diameter of the protrusion 2210 and the outer diameter of the injection hole 130 is too close, there is a risk that the protrusion 2210 will deform and intrude into the injection hole 130 during the pressing process, which may lead to leakage or damage to the single cell at the injection hole 130. However, if the distance between the inner diameter of the protrusion 2210 and the outer diameter of the injection hole 130 is too far, there will be a large empty area between the protrusion 2210 and the injection hole 130, which means that the protrusion 2210 needs to bear a large sealing area, which will also have a large risk of sealing failure in the sealing area. In this embodiment, the distance between the inner diameter of the protrusion 2210 and the outer diameter of the injection hole 130 is set to 0.1mm-3.6mm, which can balance the sealing area borne by the protrusion 2210 and the safe distance between the protrusion 2210 and the injection hole 130, so that the protrusion 2210 can more effectively seal the injection hole 130 and improve the operational safety of the single battery.

[0044] Furthermore, in the single battery provided in the embodiments of this disclosure, the protrusion 2210 is based on the second connecting portion 220, and the protrusion height on the side close to the first connecting portion 210 is 0.05mm-0.4mm, so that the protrusion 2210 can maintain the seal on the injection hole 130 while increasing the internal clearance height of the housing 10. Specifically, the protrusion 2210 is a direct structure for sealing the injection hole 130. If its protrusion height is too low, there will be a significant risk of leakage during the riveting process. That is, a portion of the circumferential area of ​​the protrusion 2210 may have low structural strength due to insufficient material density and collapse under the riveting force, resulting in the protrusion 2210 failing to form a continuous isolation structure and causing the sealing of the injection hole 130 to fail. On the other hand, if the protrusion height of the protrusion 2210 is too high, although it can ensure its sealing effect on the injection hole 130, the protrusion based on the second connecting part 220 will require the recessed area 120 to have a deeper recessed depth to meet the embedded assembly of the connector 20 on the housing 10. However, the excessively deep recessed area 120 will intrude into the internal space of the housing 10, thereby reducing the clearance height of the power supply cell inside the housing 10, even lower than the structure with sealing gaskets or sealants in the prior art, and thus failing to increase the capacity of the single battery. Therefore, in this embodiment, the protrusion height of the protrusion 2210 based on the second connecting part 220 is 0.05mm-0.4mm, so as to balance the net height inside the housing 10 and the sealing effect of the protrusion 2210 on the injection hole 130.

[0045] To further improve the sealing effect of connector 20 on injection hole 130, such as Figure 10 , Figure 11 and Figure 12 As shown, in some embodiments of this disclosure, a sealing ring 2220 is also provided on the second connecting portion 220. Similar to the protrusion 2210, the sealing ring 2220 is also a protrusion structure based on the second connecting portion 220. At the same time, the sealing ring 2220 and the protrusion 2210 are spaced apart to surround the protrusion 2210 and form a continuous closed structure. In a specific embodiment of this disclosure, the sealing ring 2220 and the protrusion 2210 have similar structures so that the sealing ring 2220 and the protrusion 2210 are equally spaced at any position in their circumference. Furthermore, the sealing ring 2220 is positioned to contact the bottom surface of the recessed area 120, so that during the riveting process between the connector 20 and the housing 10, the sealing ring 2220 can achieve the same effect as the protrusion 2210, that is, to make close contact with the bottom of the recessed area 120 to seal the injection hole 130. Moreover, due to the spaced arrangement between the sealing ring 2220 and the protrusion 2210, two sealing structures can be formed on the outer periphery of the injection hole 130, thereby reducing the risk of leakage of the single cell when the sealing structure of the single-layer protrusion 2210 fails.

[0046] It should also be noted that since the sealing ring 2220 is an auxiliary sealing structure for the protrusion 2210, it does not need to have the same structural strength as the protrusion 2210. That is, the protrusion width of the sealing ring 2220 can be smaller than that of the protrusion 2210, so as to minimize the sum of the contact areas between the sealing ring 2220 and the protrusion 2210 and the bottom surface of the recessed area 120 during the riveting process. This allows the riveting force to be concentrated on the protruding surfaces of the sealing ring 2220 and the protrusion 2210, ensuring that the sealing ring 2220 and the protrusion 2210 can simultaneously make tight contact with the bottom surface of the recessed area 120, so as to achieve a circumferential sealing effect on the injection hole 130.

[0047] Based on the above embodiments, in order to further improve the sealing effect of the liquid injection hole 130 in the single battery cell, such as... Figure 10 and Figure 13 As shown, in some embodiments of this disclosure, the single battery cell further includes a sealing member 2230, which is disposed between the second connecting portion 220 and the bottom surface of the recessed area 120, and is pressed between the second connecting portion 220 and the bottom surface of the recessed area 120 during the riveting process of the connecting member 20 and the housing 10. Unlike the sealing structures in the prior art, the sealing element 2230 in this embodiment is only used for auxiliary sealing. Based on the protrusion 2210 already provided on the second connecting part 220, it is arranged around the outer periphery of the injection hole 130 for flexible sealing. It works in conjunction with the rigid protrusion 2210 to improve the sealing effect. However, the main sealing function of the injection hole 130 is still achieved through the structure of the protrusion 2210. Therefore, the sealing element 2230 does not need to have a thick body thickness like the sealing structures in the prior art. Its thickness is less than or equal to the protrusion thickness of the protrusion 2210 based on the second connecting part 220. Thus, it does not need to occupy space in the direction perpendicular to the end face 110 and will not affect the net height inside the housing 10.

[0048] Furthermore, in the above embodiments, the seal 2230 can be a flexible gasket, a fluororubber sealing ring, or pre-applied sealant to form a flexible sealing structure. Simultaneously, regarding the seal 2230, in the radial direction of the injection hole 130, the seal 2230 can be disposed between the protrusion 2210 and the first connecting portion 210 to provide a flexible seal for the injection hole 130 between the protrusion 2210 and the injection hole 130. Furthermore, based on the embodiment with the sealing ring 2220 structure, the seal 2230 can also be disposed in the radial direction of the injection hole 130 between the protrusion 2210 and the sealing ring 2220 to form a "rigid-flexible-rigid" sealing chain in the radial direction of the injection hole 130, thereby improving the sealing level of the injection hole 130. Similarly, the seal 2230 can also be provided in multiple layers, that is, the seal 2230 is provided between the protrusion 2210 and the sealing ring 2220, and between the protrusion 2210 and the injection hole 130, to form a multi-level flexible sealing structure and improve the sealing effect of the injection hole 130.

[0049] Furthermore, it should be noted that in some embodiments of this disclosure, the housing 10 is a cylindrical structure, and the injection hole 130 is disposed on one circular end face of the cylindrical housing 10.

[0050] Furthermore, in some other embodiments of this disclosure, a battery pack is also provided. This battery pack specifically includes a housing to form a closed enclosure structure, and multiple individual batteries provided in any of the above embodiments are disposed inside the housing. Since the individual battery has the technical effects provided in any of the above embodiments, the battery pack also has the technical effects provided in any of the above embodiments, and will not be repeated here. It should be noted that the individual batteries inside the housing can be cylindrical or prismatic, both of which have an injection hole 130, and the injection hole 130 is sealed by a riveted connector 20. Simultaneously, for the cylindrical battery structure, it can be arranged with its axis perpendicular to the bottom plate of the housing, in a vertical placement structure; alternatively, the cylindrical battery can be arranged with its axis parallel to the bottom plate of the housing, in a horizontal placement. It should also be noted that in the battery pack provided in the above embodiments, a cold plate is also provided inside the housing to dissipate heat from the multiple individual batteries, and the side of the individual battery shell 10 with the injection hole 130 is positioned opposite to the cold plate to optimize the heat dissipation effect of the battery pack.

[0051] The terms "first," "second," "left side," and "right side," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may not be defined in the listed steps or units, but may include steps or units not listed.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single cell, characterized by, include: The housing (10) is provided with a liquid injection hole (130). A connector (20) is riveted to the housing (10) to seal the injection hole (130); the connector (20) includes a first connecting part (210) and a second connecting part (220), at least a portion of the first connecting part (210) is located in the injection hole (130), the second connecting part (220) is provided with a protrusion (2210), and the second connecting part (220) is fixedly connected to the outer wall of the housing (10), the protrusion (2210) surrounds the injection hole (130).

2. The unit cell of claim 1, wherein, The housing (10) is recessed to form a recessed area (120), and the injection hole (130) is opened in the recessed area (120); in a direction perpendicular to the injection hole (130), at least a portion of the second connecting portion (220) is located in the recessed area (120).

3. The unit cell of claim 1, wherein, On the side of the second connecting portion (220) facing the injection hole (130), the ratio of the width of the protrusion (2210) to the width of the second connecting portion (220) is 0.25-0.

75.

4. The single-cell battery as described in claim 1, characterized in that, The protrusion (2210) is a ring structure, and the protrusion (2210) is concentrically arranged with the injection hole (130).

5. The unit cell of claim 4, wherein, The distance between the inner diameter of the protrusion (2210) and the outer diameter of the injection hole (130) is 0.1mm-3.6mm.

6. The cell of claim 1 wherein, The height of the protrusion (2210) on the side near the first connecting part (210) is 0.05mm-0.4mm.

7. The cell of claim 1 wherein, It also includes a seal (2230), which is pressed against the housing (10) by the second connection (220), and the seal (2230) is disposed around the outer periphery of the injection hole (130).

8. The unit cell of claim 7, wherein, The sealing element (2230) is disposed radially between the protrusion (2210) and the first connecting portion (210) of the injection hole (130), or, The sealing element (2230) is radially spaced on the side of the protrusion (2210) away from the injection hole (130) of the injection hole (130).

9. The cell of claim 1 wherein, The shell (10) is a cylindrical structure.

10. A battery pack, characterized by, It includes a housing and a single battery cell as described in any one of claims 1-9.

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