WO2024103405A1 - 电池单体、电池及用电设备 - Google Patents

电池单体、电池及用电设备 Download PDF

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Publication number
WO2024103405A1
WO2024103405A1 PCT/CN2022/132976 CN2022132976W WO2024103405A1 WO 2024103405 A1 WO2024103405 A1 WO 2024103405A1 CN 2022132976 W CN2022132976 W CN 2022132976W WO 2024103405 A1 WO2024103405 A1 WO 2024103405A1
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WO
WIPO (PCT)
Prior art keywords
welding
battery cell
groove
thickness direction
blocking member
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PCT/CN2022/132976
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English (en)
French (fr)
Inventor
罗志新
朱文琪
温裕乾
Original Assignee
宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2022/132976 priority Critical patent/WO2024103405A1/zh
Publication of WO2024103405A1 publication Critical patent/WO2024103405A1/zh

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings; Jackets or wrappings
    • H01M50/147Lids or covers
    • H01M50/166Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering

Definitions

  • the present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device.
  • the embodiments of the present application provide a battery cell, a battery and an electrical device to improve the stability of battery power supply.
  • an embodiment of the present application provides a battery cell, comprising a shell, an electrode terminal and a first sealing member; the shell comprises a wall portion; the electrode terminal is arranged on the wall portion, and a receiving groove is provided on a surface of the electrode terminal away from the interior of the battery cell along a thickness direction of the wall portion, and a groove side wall of the receiving groove comprises a first welding surface; the first sealing member is at least partially received in the receiving groove, the first sealing member comprises a second welding surface, a welding gap is formed between the second welding surface and the first welding surface, the first sealing member is welded to the electrode terminal to form a welding portion, the welding portion connects the first welding surface and the second welding surface, and is at least partially located in the welding gap.
  • the groove side wall of the accommodating groove accommodating the first blocking member includes a first welding surface
  • the first blocking member has a second welding surface
  • the first blocking member is welded to the electrode terminal to form a welding portion
  • the welding portion connects the first welding surface and the second welding surface, and is at least partially located in the welding gap
  • the welding portion may not extend out of the welding gap in a direction away from the interior of the battery cell or the size of the portion extending out of the welding gap in a direction away from the interior of the battery cell is smaller
  • the busbar component is connected to the first blocking member to achieve electrical connection between the battery cells
  • the busbar component is connected to the first blocking member (such as welding)
  • the welding portion does not exceed the welding gap or exceeds the welding gap to a very small extent
  • the first sealing member includes a first surface, which is a surface of the first sealing member farthest from the interior of the battery cell along the thickness direction of the wall portion, and the welding portion does not exceed the first surface.
  • the welding portion does not extend beyond the first surface.
  • the busbar component is connected to the first surface of the first blocking member to achieve electrical connection between battery cells
  • the welding portion since the welding portion does not extend beyond the first surface, when the busbar component is connected to the first surface (such as welding), the welding portion will not interfere with the busbar component, so that the busbar component and the first surface form a stable connection relationship, thereby forming a stable electrical connection relationship between the first blocking member and the busbar component, which is beneficial to improving the stability of the power output of the battery equipped with the battery cell.
  • the welding gap in the thickness direction of the wall portion, gradually increases in a direction away from the interior of the battery cell.
  • the welding gap gradually increases in the direction away from the interior of the battery cell. Then, along the thickness direction of the wall portion, the size of the welding gap at one end close to the first surface is larger, providing a larger space for the welding gun, thereby facilitating the welding gun to enter the welding gap and facilitate welding.
  • the electrode terminal along the thickness direction of the wall portion, has a second surface farthest from the interior of the battery cell, the accommodating groove is recessed from the second surface toward the interior of the battery cell, and the first welding surface is arranged at an obtuse angle to the second surface.
  • the first welding surface and the second surface are set at an obtuse angle, so the accommodating groove forms a larger notch near the second surface, which facilitates the first blocking member to enter the accommodating groove from the notch on the second surface.
  • the angle between the first welding surface and the second surface is ⁇ , satisfying 110° ⁇ 160°.
  • the larger notch formed by the receiving groove near the second surface is not preferred for the size of the electrode terminal of the actual product. If ⁇ is too large, although the larger notch can be formed near the second surface of the receiving groove to facilitate the first blocking member to enter the receiving groove, the electrode terminal may be affected in structural strength due to the excessive notch. Therefore, 110° ⁇ 160° can not only make the notch of the receiving groove near the second surface larger, facilitate the first blocking member to enter the receiving groove, but also make the structural strength of the electrode terminal meet actual needs.
  • the first welding surface is connected to the second surface.
  • the first welding surface is connected to the second surface, so that the welding gap extends from the second surface toward the inside of the battery cell, making welding more convenient.
  • the first sealing member includes a first surface, which is a surface of the first sealing member farthest from the interior of the battery cell along the thickness direction of the wall portion, and the first surface is flush with the second surface.
  • the first surface and the second surface are flush, which is conducive to reducing the size of the overall structure composed of the electrode terminal and the first blocking member along the thickness direction of the wall, thereby reducing the size of the battery cell along the thickness direction of the wall.
  • the first welding surface is a first conical surface, and along the thickness direction of the wall portion, the large end of the first welding surface is farther away from the interior of the battery cell than the small end of the first welding surface.
  • the first welding surface is a first conical surface, and the large end of the first welding surface is farther away from the interior of the battery cell than the small end of the first welding surface, so that the size of the notch of the accommodating groove close to the electrode terminal away from the interior of the battery cell is larger, which facilitates the first blocking member to enter the accommodating groove.
  • the first conical surface is a circular conical surface.
  • the first conical surface is a circular conical surface, which makes processing easier.
  • the structure of the circular conical surface along its circumference is the same, so the positioning accuracy of the first sealing member relative to the receiving groove is not required to be high, which facilitates the assembly of the first sealing member and the electrode terminal and improves the assembly efficiency.
  • the first sealing member includes a first surface, which is a surface of the first sealing member farthest from the interior of the battery cell along the thickness direction of the wall portion, and the second welding surface is arranged at an obtuse angle to the first surface.
  • the second welding surface is set at an obtuse angle with the first surface, which is conducive to forming a welding gap with a larger opening on the inner side away from the battery cell, thereby facilitating the welding gun to enter the welding gap and facilitating the welding of the electrode terminal and the first sealing member.
  • the second welding surface is connected to the first surface.
  • the second welding surface is connected to the first surface, so that the welding gap extends from the first surface toward the inside of the battery cell, making welding more convenient.
  • the second welding surface is a second conical surface, and along the thickness direction of the wall portion, the small end of the second welding surface is farther away from the interior of the battery cell than the large end of the second welding surface.
  • the second welding surface is a second conical surface, and the small end of the second welding surface is farther away from the interior of the battery cell than the large end of the second welding surface, which is conducive to forming a welding gap with a larger opening, thereby facilitating welding of the electrode terminal and the first blocking member.
  • the first welding surface is a first conical surface, and along the thickness direction of the wall portion, the large end of the first welding surface is farther away from the interior of the battery cell than the small end of the first welding surface;
  • the first sealing member also includes a third conical surface, the third conical surface is arranged opposite to the first conical surface, and the third conical surface is connected to the large end of the second conical surface.
  • the first welding surface is a first conical surface
  • the large end of the first welding surface is farther away from the interior of the battery cell than the small end of the first welding surface
  • the second conical surface and part of the first conical surface form a welding gap
  • the welding gap gradually increases in the direction away from the interior of the battery cell, so the size of the welding gap close to the first surface is larger, providing a larger space for the welding gun, thereby facilitating the welding gun to enter the welding gap and facilitate welding.
  • the third conical surface and the first conical surface are arranged relative to each other, so that the shape of the first blocking member can be more closely matched with the shape of the receiving groove, which is convenient for assembly.
  • the second conical surface is a circular conical surface; and/or the third conical surface is a circular conical surface.
  • the conical surface is easier to process, and the second conical surface and/or the third conical surface are conical surfaces. Then, when the first sealing piece enters the receiving groove, the structure of the conical surface along its circumference is the same, so that the positioning accuracy requirement of the first sealing piece relative to the receiving groove is not high, which facilitates the assembly of the first sealing piece and the electrode terminal and improves the assembly efficiency.
  • the first sealing member also includes a first side surface, which is connected to the large end of the second welding surface;
  • the groove side wall of the accommodating groove also includes a first side wall surface, and along the thickness direction of the wall portion, the first side wall surface is closer to the interior of the battery cell than the first welding surface, and the first side wall surface is connected to an end of the first welding surface close to the interior of the battery cell;
  • the first side wall surface is arranged opposite to the first side surface, and the first side wall surface and the first side surface are both cylindrical surfaces extending along the thickness direction of the wall portion.
  • the first side wall surface and the first side surface are both cylindrical surfaces extending along the thickness direction of the wall portion, and the cylindrical surfaces are easier to process.
  • the maximum size of the welding gap is L, satisfying 0.1 mm ⁇ L ⁇ 0.7 mm.
  • the size of the welding gap is small along the thickness direction of the wall. In order to prevent the welding part from exceeding the first surface along the thickness direction of the wall, the size of the welding part in the thickness direction of the wall is also small, which may lead to insufficient welding strength. If L>0.7mm, the size of the welding gap is large along the thickness direction of the wall, and the welding difficulty increases. Therefore, 0.1mm ⁇ L ⁇ 0.7mm enables the size of the welding part to meet the welding strength requirements of the electrode terminal and the first blocking member, and makes the welding difficulty less.
  • the first sealing member includes a first surface, which is the surface of the first sealing member farthest from the interior of the battery cell along the thickness direction of the wall portion, and the first surface is also provided with a groove, which is arranged around an axis parallel to the thickness direction of the wall portion.
  • the provision of the groove can release the welding stress during the welding process between the electrode terminal and the first blocking member, improve the welding quality, and alleviate the deformation of the first blocking member and the electrode terminal during the welding process.
  • the accommodating groove is a stepped groove, and the accommodating groove includes a first groove section and a second groove section that are connected, the first groove section is farther away from the interior of the battery cell than the second groove section, at least a portion of the first sealing member is accommodated in the first groove section, and the first welding surface is at least a portion of the groove side wall of the first groove section.
  • the accommodating groove is a stepped groove, which can not only reduce the size of the electrode terminal along the thickness direction of the wall, facilitate the welding of the electrode terminal and the tab inside the battery cell, but also reduce the weight of the electrode terminal, thereby reducing the weight of the battery cell.
  • the first sealing member includes a connected main body portion and an extension portion, the main body portion is accommodated in the first groove section and abuts against the groove bottom wall of the first groove section, the extension portion extends from the main body portion into the second groove section, and the second welding surface is at least a portion of the outer peripheral surface of the main body portion.
  • the main body is accommodated in the first slot section and abuts against the bottom wall of the first slot section, which can limit the first blocking member from moving further toward the inside of the battery cell in the thickness direction of the wall, facilitating electrical connection between the current collecting component and the first blocking member.
  • the extension portion extends from the main body into the second slot section, forming a positioning fit from the second slot section, which is conducive to maintaining a stable relative position relationship between the first blocking member and the electrode terminal.
  • the extension portion includes a second side surface and a third surface closest to the interior of the battery cell along the thickness direction of the wall portion, and the second side surface and the third surface are connected by a chamfered surface.
  • the third surface and the second side surface are connected by a chamfered surface.
  • the setting of the chamfered surface can not only eliminate burrs at the end of the extension part, but also play a guiding role in the process of the first sealing piece entering the receiving groove, so that the first sealing piece can enter the receiving groove smoothly.
  • the groove side wall of the second groove segment is spaced apart from the outer peripheral surface of the extension portion.
  • the groove side wall of the second groove section is spaced apart from the outer peripheral surface of the extension portion, which facilitates the assembly of the first blocking member and the electrode terminal.
  • the distance between the groove side wall of the second groove segment and the outer peripheral surface of the extension portion is h, 0.03mm ⁇ h ⁇ 0.1mm.
  • 0.03mm ⁇ h ⁇ 0.1mm makes the distance between the groove side wall of the second groove section and the outer peripheral surface of the extension part within a range that is easy to control, and also makes the space for the first plugging piece to move in the second groove section smaller during the welding process of the electrode terminal and the first plugging piece, thereby improving the welding uniformity and facilitating the improvement of the welding quality.
  • a dimension of the main body portion is n, satisfying 0.7 mm ⁇ n ⁇ 1.5 mm.
  • n ⁇ 0.7 mm the strength of the main body is insufficient and cannot meet the actual use requirements. If n > 1.5 mm, the dimension of the main body along the thickness direction of the wall is too large, which increases the size of the battery cell. Therefore, 0.7 mm ⁇ n ⁇ 1.5 mm can not only make the dimension of the battery cell along the thickness direction of the wall within a reasonable range, but also ensure the structural strength of the main body.
  • the electrode terminal is provided with a liquid injection hole, and the liquid injection hole communicates with the receiving groove and the interior of the battery cell.
  • the injection hole is arranged on the electrode terminal, which makes the processing more convenient and can also avoid the injection hole being arranged on the shell to affect the structural strength of the shell.
  • the battery cell further includes a second blocking member, at least a portion of which is inserted into the liquid injection hole to block the liquid injection hole.
  • the second plugging piece blocks the liquid injection hole, which can reduce the risk of battery cell leakage and the risk of welding slag falling into the battery cell from the liquid injection hole during the welding process between the first plugging piece and the electrode terminal.
  • the second plugging piece can also play a certain role in heat insulation, reducing the damage to the internal structure and materials of the battery cell caused by high temperature during the welding process between the first plugging piece and the electrode terminal.
  • the second sealing member includes a sealing portion and a limiting portion, the sealing portion is inserted into the injection hole, the limiting portion is connected to one end of the sealing portion and is located in the receiving groove, and the limiting portion is used to abut against the bottom wall of the receiving groove.
  • the limiting portion of the second blocking member abuts against the bottom wall of the accommodating groove, so that the second blocking member can move into the battery cell, reducing the risk of the second blocking member falling into the battery cell.
  • the first blocking member is provided with an escape portion, and the escape portion is used to accommodate a portion of the second blocking member.
  • the setting of the avoidance part can reduce the risk of interference between the second blocking member and the first blocking member.
  • the avoidance part accommodates a part of the second blocking member, that is, a part of the second blocking member is embedded in the first blocking member, which is conducive to reducing the size of the overall structure formed by the first blocking member and the second blocking member.
  • an embodiment of the present application further provides a battery, comprising the battery cell provided in the embodiment of the first aspect.
  • the welding part between the electrode terminal of the battery cell and the first blocking member in the first aspect embodiment does not exceed the first surface of the first blocking member. Therefore, when the busbar component is connected to the first surface (such as welding), the welding part will not interfere with the busbar component, so that the busbar component and the first surface form a stable connection relationship, thereby forming a stable electrical connection relationship between the first blocking member and the busbar component, which is beneficial to improving the stability of the battery output power.
  • an embodiment of the present application further provides an electrical device, comprising the battery provided in the embodiment of the second aspect.
  • the battery provided in the second aspect of the embodiment can stably output electrical energy, thereby ensuring that the electrical equipment can work stably.
  • FIG1 is a schematic diagram of welding a first blocking member and a current collecting component in the related art
  • FIG2 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application.
  • FIG3 is an exploded view of a battery provided in some embodiments of the present application.
  • FIG4 is an exploded view of a battery cell provided in some embodiments of the present application.
  • FIG5 is a schematic diagram of an assembled wall portion, an electrode terminal, and a first blocking member provided in some embodiments of the present application;
  • FIG6 is an enlarged view of point A in FIG5 ;
  • FIG7 is a schematic structural diagram of the electrode terminal and the first blocking member in FIG5 after welding;
  • FIG8 is an enlarged view of point B in FIG7;
  • FIG9 is a schematic diagram of the structure of electrode terminals provided in some embodiments of the present application.
  • FIG10 is a schematic structural diagram of an electrode terminal and a first blocking member after welding provided in other embodiments of the present application.
  • FIG11 is an enlarged view of point C in FIG10 ;
  • FIG12 is a cross-sectional view of an electrode terminal provided in some embodiments of the present application.
  • FIG13 is a schematic diagram of an electrode terminal and a first blocking member after welding provided in some other embodiments of the present application.
  • FIG14 is a schematic diagram of electrode terminals and first blocking members after welding provided in some other embodiments of the present application.
  • FIG15 is a cross-sectional view of a first blocking member provided in some embodiments of the present application.
  • FIG16 is a cross-sectional view of a first blocking member provided in some other embodiments of the present application.
  • FIG17 is a schematic diagram of electrode terminals and first blocking members after welding provided in some other embodiments of the present application.
  • FIG18 is an enlarged view of point D in FIG17 ;
  • FIG19 is a schematic diagram of an electrode terminal and a first blocking member after welding provided in some other embodiments of the present application.
  • FIG20 is an enlarged view of point E in FIG19 ;
  • FIG21 is a schematic diagram of an electrode terminal and a first blocking member after welding provided in still other embodiments of the present application.
  • Fig. 22 is an enlarged view of point F in Fig. 21;
  • FIG23 is a schematic diagram of an electrode terminal and a first blocking member after assembly according to some other embodiments of the present application.
  • FIG24 is an enlarged view of point G in FIG23;
  • FIG25 is a schematic diagram of the cooperation between the electrode terminal and the first blocking member provided in some other embodiments of the present application.
  • FIG26 is a schematic diagram of the structure of the electrode terminal and the first blocking member after they are matched with each other in some other embodiments of the present application;
  • FIG. 27 is a schematic diagram of the structure of the electrode terminal and the first blocking member after they are matched together according to some other embodiments of the present application.
  • Icons 1000-vehicle; 100-battery; 10-box; 11-first part; 12-second part; 20-battery cell; 21-housing; 211', 211-wall; 2111-mounting hole; 212-housing; 2121-opening; 213-end cover; 22', 22-electrode terminal; 221', 221-accommodating groove; 2211-first welding surface; 2212-first side wall surface; 2213-first groove section; 2214-second groove section; 222-first abutment portion; 223-second abutment portion; 224-connecting portion; 225-annular groove; 226-second surface; 227-first transition surface; 228-liquid injection hole; 23-insulating member; 30', 30-second A blocking member; 31', 31-first surface; 32-second welding surface; 33-second transition surface; 34-third conical surface; 35-first side surface; 36-groove; 361-first section; 362-second section; 37-main body; 38
  • the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
  • the terms “first”, “second”, “third”, etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
  • Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application fields of power batteries 100, the market demand is also constantly expanding.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in the present application may include a battery module or a battery pack.
  • the battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this.
  • Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.
  • the plurality of battery cells are connected in series, in parallel or in hybrid connection through a busbar component.
  • Hybrid connection means that the plurality of battery cells are connected in both series and in parallel.
  • the battery cell 20' comprises a housing 21', an electrode terminal 22' and an electrode assembly 60', wherein the electrode assembly 60' is contained in the housing 21', the electrode terminal 22' is disposed on the wall 211' of the housing 21', and the electrode terminal 22' is used to be electrically connected to the electrode assembly 60'.
  • the busbar component 400' is electrically connected to the electrode terminal 22' of the battery cell 20' so as to realize the connection of multiple battery cells 20 in series, parallel or mixed connection.
  • the busbar component 400' is generally not directly connected to the electrode terminal 22', but is directly connected to the first blocking member 30' by welding the first blocking member 30' on the electrode terminal 22', thereby realizing electrical connection between the electrode terminal 22' and the busbar component 400' through the first blocking member 30'.
  • a receiving groove 221' is provided on the surface of the electrode terminal 22' away from the inside of the battery cell 20', at least part of the first blocking member 30' is received in the receiving groove 221', and along the thickness direction X of the wall, the first surface 31' of the first blocking member 30' farthest from the inside of the battery cell 20' is used for welding with the busbar component 400', thereby realizing electrical connection.
  • a welding portion 50' will be formed after the first blocking member 30' and the electrode terminal 22' are welded.
  • the welding portion 50' will protrude from the first surface 31' of the first blocking member 30'.
  • the busbar component 400' When the busbar component 400' is welded to the first surface 31', the busbar component 400' will press against the side of the busbar component 400' facing the first blocking member 30', thereby affecting the welding quality between the busbar component 400' and the first blocking member 30' and possibly causing a cold weld between the busbar component 400' and the first surface 31', thereby making the electrical connection between the first blocking member 30' and the busbar component 400' unstable or even ineffective.
  • the inventors have designed a battery cell after in-depth research.
  • the side wall of the accommodating groove arranged on the surface of the electrode terminal away from the interior of the battery cell includes a first welding surface;
  • the first sealing member includes a second welding surface, and a welding gap is formed between the second welding surface and the first welding surface.
  • the first sealing member is welded to the electrode terminal to form a welding portion, which connects the first welding surface and the second welding surface and is at least partially located in the welding gap.
  • the groove side wall of the accommodating groove for accommodating the first blocking member includes a first welding surface, the first blocking member has a second welding surface, the first blocking member is welded to the electrode terminal to form a welding portion, the welding portion connects the first welding surface and the second welding surface, and is at least partially located in the welding gap, then the welding portion may not extend out of the welding gap in a direction away from the interior of the battery cell, or the size of the portion extending out of the welding gap in a direction away from the interior of the battery cell is smaller, then when the busbar component is connected to the first blocking member to achieve electrical connection between the battery cells, since the welding portion does not exceed the first surface, when the busbar component is connected to the first blocking member (such as welding), since the welding portion does not exceed the welding gap or exceeds the welding gap to a very small extent, it is beneficial to alleviate the problem of interference between the welding portion and the busbar component, and it is beneficial to form a stable connection relationship between the busbar component and the first blocking member, thereby forming a stable electrical connection relationship
  • the battery cells disclosed in the embodiments of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft.
  • the power supply system of the electrical equipment can be composed of the battery cells and batteries disclosed in the present application, which is conducive to improving the stability of the battery power output.
  • the embodiment of the present application provides an electric device using a battery as a power source
  • the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc.
  • the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc.
  • the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.
  • FIG 2 is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application.
  • the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • a battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000.
  • the battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000.
  • the vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.
  • the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
  • FIG. 3 is an exploded view of a battery 100 provided in some embodiments of the present application.
  • the battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is contained in the box body 10.
  • the box body 10 is used to provide a storage space for the battery cell 20, and the box body 10 can adopt a variety of structures.
  • the box body 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20.
  • the second part 12 may be a hollow structure with one end open to form a storage cavity for accommodating the battery cell 20, and the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open to form a storage cavity for accommodating the battery cell 20, and the open side of the first part 11 covers the open side of the second part 12.
  • the box body 10 formed by the first part 11 and the second part 12 can be in various shapes, such as a cylinder, a cuboid, etc.
  • the battery 100 there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection.
  • a mixed connection means that the multiple battery cells 20 are both connected in series and in parallel.
  • the multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10.
  • the battery 100 may also include other structures.
  • the battery 100 may include a busbar component (not shown in FIG. 2 ) for realizing electrical connection between the multiple battery cells 20.
  • Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.
  • the battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.
  • the battery cell 20 includes an outer shell 21, an electrode terminal 22 and a first sealing member 30;
  • the outer shell 21 includes a wall portion 211;
  • the electrode terminal 22 is arranged on the wall portion 211, and the surface of the electrode terminal 22 away from the interior of the battery cell 20 along the thickness direction X of the wall portion is provided with a receiving groove 221, and the groove side wall of the receiving groove 221 includes a first welding surface 2211;
  • the first sealing member 30 is at least partially accommodated in the receiving groove 221, the first sealing member 30 includes a second welding surface 32, and a welding gap 40 is formed between the second welding surface 32 and the first welding surface 2211, the first sealing member 30 is welded to the electrode terminal 22, and a welding portion 50 is formed, the welding portion 50 connects the first welding surface 2211 and the second welding surface 32, and is at least partially located in the welding gap 40.
  • the housing 21 includes a shell 212 and an end cap 213.
  • One end of the shell 212 has an opening 2121.
  • the end cap 213 is used to seal the opening 2121 of the shell 212, so that the end cap 213 and the shell 212 together form a storage space for accommodating the electrode assembly 60.
  • the shape of the end cap 213 can be adapted to the shape of the shell 212 to match the shell 212.
  • the end cap 213 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 213 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved.
  • the shell 212 is a component used to cooperate with the end cap 213 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 60, the electrolyte and other components.
  • the shell 212 and the end cap 213 can be independent components, and an opening 2121 can be set on the shell 212, and the end cap 213 is covered at the opening 2121 to form the internal environment of the battery cell 20.
  • the end cap 213 and the shell 212 can also be integrated. Specifically, the end cap 213 and the shell 212 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 212, the end cap 213 is covered with the shell 212.
  • the shell 212 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 60.
  • the shell 212 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.
  • the electrode assembly 60 is a component in the battery cell 20 where electrochemical reactions occur.
  • One or more electrode assemblies 60 may be included in the housing 212.
  • the electrode assembly 60 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets.
  • the parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 60, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 61.
  • the positive tab 61 and the negative tab 61 may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the tab 61 connects the electrode terminal 22 to form a current loop.
  • the wall portion 211 where the electrode terminal 22 is disposed may be the end cap 213 or the wall of the housing 212.
  • Fig. 4 shows that the electrode terminal 22 is disposed on the end cap 213, that is, the end cap 213 is the wall portion 211 where the electrode terminal 22 is disposed.
  • the electrode terminal 22 is a functional component that can be used to electrically connect to the electrode assembly 60 contained in the housing 21 to output or input the electric energy of the battery cell 20 .
  • a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value may also be provided on the end cap 213.
  • the material of the end cap 213 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.
  • an insulating member 23 may also be provided on the inner side of the end cap 213, and the insulating member 23 may be used to isolate the electrical connection portion 224 in the housing 212 from the end cap 213 to reduce the risk of short circuit.
  • the insulating member 23 may be plastic, rubber, etc.
  • the wall portion 211 is provided with a mounting hole 2111, and the mounting hole 2111 penetrates both sides of the wall portion 211 along the thickness direction X of the wall portion.
  • the mounting hole 2111 can have various shapes, such as a circular hole, a square hole, a tapered hole, etc.
  • FIG4, FIG5, and FIG7 show the case where the mounting hole 2111 is a circular hole.
  • the electrode terminal 22 is inserted into the mounting hole 2111.
  • the electrode terminal 22 includes a first abutting portion 222, a second abutting portion 223 and a connecting portion 224.
  • the first abutting portion 222 extends around the outer circumference of the connecting portion 224 and protrudes from the outer circumferential surface of the connecting portion 224
  • the second abutting portion 223 extends around the outer circumference of the connecting portion 224 and protrudes from the outer circumferential surface of the connecting portion 224.
  • the first abutting portion 222, the second abutting portion 223 and the connecting portion 224 jointly form an annular groove 225, and the wall portion 211 is clamped in the annular groove 225.
  • the connecting portion 224 is arranged in the mounting hole 2111, and the first abutting portion 222 and the second abutting portion 223 are respectively located on both sides of the wall portion 211.
  • the first abutting portion 222 and the second abutting portion 223 are respectively abutted against two opposite surfaces of the wall portion 211, thereby playing a limiting role, so that the electrode terminal 22 is stably arranged on the wall portion 211.
  • the structural shape of the connecting portion 224 can match the structural shape of the mounting hole 2111.
  • the connecting portion 224 can be a cylindrical structure
  • the connecting portion 224 can be a conical structure
  • the second abutting portion 223 is located on the side of the wall portion 211 facing the interior of the battery cell 20, and the first abutting portion 222 is located on the side of the wall portion 211 away from the interior of the battery cell 20.
  • the first abutting portion 222 and the second abutting portion 223 are many structural forms of the first abutting portion 222 and the second abutting portion 223, for example, the first abutting portion 222 is a circular ring structure, and the second abutting portion 223 is a disc structure.
  • the structures of the first abutting portion 222 and the second abutting portion 223 can be the same or different.
  • FIG3 shows that the first abutting portion 222 is a circular ring structure, the second abutting portion 223 is a disc structure, and the outer diameter of the first abutting portion 222 is smaller than the outer diameter of the second abutting portion 223.
  • the first abutting portion 222, the second abutting portion 223 and the connecting portion 224 can be separately provided and then connected into an integral structure, such as by welding connection, adhesive connection, etc.
  • the first abutting portion 222, the second abutting portion 223 and the connecting portion 224 can also be integrally formed, such as by stamping, casting, etc.
  • the first abutting portion 222 can be a flange structure formed by the portion of the connecting portion 224 extending out of the mounting hole 2111.
  • the wall portion 211 may be insulated to provide an electrode terminal 22 , one of the positive electrode tab and the negative electrode tab of the electrode assembly 60 may be electrically connected to the electrode terminal 22 , and the other of the positive electrode tab and the negative electrode tab may be electrically connected to the shell 212 .
  • two electrode terminals 22 may be insulated and provided on the wall portion 211 , and the two electrode terminals 22 are electrically connected to the positive electrode tab and the negative electrode tab of the electrode assembly 60 , respectively.
  • the receiving groove 221 is recessed from the surface of the electrode terminal 22 farthest from the inside of the battery cell 20 to the direction close to the inside of the battery cell 20, and the receiving groove 221 can extend to the side of the surface of the electrode terminal 22 facing the inside of the battery cell 20, that is, along the thickness direction X of the wall, the receiving groove 221 penetrates the two opposite sides of the electrode terminal 22 to form a through hole. As shown in Figures 6 and 7, the receiving groove 221 may not extend to the side of the surface of the electrode terminal 22 facing the inside of the battery cell 20.
  • the groove sidewall of the receiving groove 221 refers to the wall surface other than the groove bottom wall of the receiving groove 221.
  • the groove bottom wall of the receiving groove 221 refers to the wall surface of the vertical wall portion of the receiving groove 221 in the thickness direction X.
  • the first welding surface 2211 is at least a part of the groove sidewall of the receiving groove 221.
  • the first blocking member 30 may be completely accommodated in the accommodation groove 221, or only a part thereof may be accommodated in the accommodation groove 221.
  • the first blocking member 30 includes a first surface 31, which is a surface of the first blocking member 30 that is farthest from the inside of the battery cell 20 along the thickness direction X of the wall portion, and the first surface 31 may be located in the accommodation groove 221, or may be located outside the accommodation groove 221.
  • the first surface 31 may also be flush with the surface of the electrode terminal 22 that is farthest from the inside of the battery cell 20.
  • the busbar component (not shown in FIGS. 4-8 ) may be welded or abutted to the first surface 31 to achieve electrical connection between the busbar component and the first plugging member 30.
  • the projection of the second welding surface 32 in a plane parallel to the thickness direction X of the wall and the projection of the first welding surface 2211 in a plane parallel to the direction of the wall 211 at least partially overlap, and a welding gap 40 is formed between the overlapping areas of the projections of the first welding surface 2211 and the second welding surface 32.
  • the electrode terminal 22 and the first plugging member 30 are welded in the welding gap 40.
  • the welding portion 50 may be entirely located in the welding gap 40, or the welding portion 50 may be partially contained in the welding gap 40, and the other portion extends out of the welding gap 40 in the thickness direction X of the wall in a direction away from the inside of the battery cell 20.
  • the first welding surface 2211 can be a closed loop surface arranged around the axis of the thickness direction X of the parallel wall portion
  • the second welding surface 32 can be a closed loop surface arranged around the axis of the thickness direction X of the parallel wall portion
  • the welding gap 40 can be an annular gap around the axis of the thickness direction X of the parallel wall portion
  • the welding portion 50 can be an annular structure located within the welding gap 40 and consistent with the extension drive of the welding gap 40, so that the welding portion 50 can not only connect the electrode terminal 22 and the first sealing member 30, but also play a sealing role between the first sealing member 30 and the electrode terminal 22.
  • the side wall of the receiving groove 221 for receiving the first blocking member 30 includes a first welding surface 2211, the first blocking member 30 has a second welding surface 32, the first blocking member 30 is welded to the electrode terminal 22, and a welding portion 50 is formed, the welding portion 50 connects the first welding surface 2211 and the second welding surface 32, and is at least partially located in the welding gap 40, then the welding portion 50 may not extend out of the welding gap 40 in a direction away from the interior of the battery cell 20 or in a direction away from the battery cell. 20, the size of the portion extending out of the welding gap 40 in the direction of the interior is small.
  • the busbar component When the busbar component is connected to the first sealing member 30 to achieve electrical connection between the battery cells 20, when the busbar component is connected to the first sealing member 30 (for example, welded), since the welding portion 50 does not exceed the welding gap 40 or exceeds the welding gap 40 to a very small extent, it is helpful to alleviate the problem of interference between the welding portion 50 and the busbar component, so that the busbar component and the first sealing member 30 form a stable connection relationship, thereby forming a stable electrical connection relationship between the first sealing member 30 and the busbar component, which is beneficial to improve the stability of the power output of the battery 100 equipped with the battery cell 20.
  • the first sealing member 30 for example, welded
  • the first blocking member 30 includes a first surface 31 , which is a surface of the first blocking member 30 farthest from the interior of the battery cell 20 along the thickness direction X of the wall, and the welding portion 50 does not extend beyond the first surface 31 .
  • the welding gap 40 has a certain depth along the thickness direction X of the wall, and the welding portion 50 is located in the welding gap 40, so that the welding portion 50 does not exceed the first surface 31 in the thickness direction X of the wall.
  • the end of the welding portion 50 farthest from the inside of the battery cell 20 can be flush with the first surface 31, or along the thickness direction X of the wall, the end of the welding portion 50 farthest from the inside of the battery cell 20 is closer to the inside of the battery cell 20 than the first surface 31, so that the welding portion 50 does not exceed the first surface 31 in the direction away from the battery cell 20.
  • the busbar component When the welding portion 50 does not extend beyond the first surface 31, the busbar component is connected to the first surface 31 of the first blocking member 30 to achieve electrical connection between the battery cells 20. Since the welding portion 50 does not extend beyond the first surface 31, when the busbar component is connected to the first surface 31 (such as welding), the welding portion 50 will not interfere with the busbar component, so that the busbar component and the first surface 31 form a stable connection relationship, thereby forming a stable electrical connection relationship between the first blocking member 30 and the busbar component, which is beneficial to improving the stability of the power output of the battery equipped with the battery cell 20.
  • the welding gap 40 is an equal-size structure.
  • the size of the welding gap 40 refers to the distance between the first welding surface 2211 and the second welding surface 32 along the thickness direction X of the vertical wall portion.
  • the size of the welding gap 40 at any position is the same, so as to facilitate the control of the size of the welding portion 50, thereby facilitating welding and improving the welding quality.
  • the welding gap 40 gradually increases in a direction away from the interior of the battery cell 20 .
  • the welding gap 40 is a variable size structure, and the distance between the first welding surface 2211 and the second welding surface 32 gradually increases in the direction away from the interior of the battery cell 20. Then, the size of the welding gap 40 at one end away from the interior of the battery cell 20 is larger than the size of the welding gap 40 at one end close to the interior of the battery cell 20.
  • the welding gap 40 gradually increases in the direction away from the interior of the battery cell 20. Then, along the thickness direction X of the wall, the size of the end of the welding gap 40 close to the first surface 31 is larger, providing a larger space for the welding gun, thereby facilitating the welding gun to enter the welding gap 40 and facilitating welding.
  • the electrode terminal 22 has a second surface 226 farthest from the interior of the battery cell 20, the accommodating groove 221 is recessed from the second surface 226 toward the interior of the battery cell 20, and the first welding surface 2211 is set at an obtuse angle to the second surface 226.
  • the receiving groove 221 is recessed from the second surface 226 toward the direction close to the interior of the battery cell 20, and the receiving groove 221 forms a notch on the second surface 226.
  • the second surface 226 and the first surface 31 can be coplanar.
  • the first blocking member 30 can be completely accommodated in the receiving groove 221.
  • the second surface 226 is closer to the interior of the battery cell 20 than the first surface 31.
  • a portion of the first blocking member 30 is accommodated in the receiving groove 221.
  • the first surface 31 is closer to the interior of the battery cell 20 than the second surface 226.
  • the first blocking member 30 can be completely accommodated in the receiving groove 221.
  • Figures 6, 7, and 8 show the situation where the first surface 31 and the second surface 226 are coplanar.
  • a straight line parallel to the thickness direction X of the wall is defined as a reference straight line, an intersection line between the plane where the reference straight line is located and the first welding surface 2211 is a first intersection line Y1, and an intersection line between the plane where the reference straight line is located and the second surface 226 is a second intersection line Y2.
  • the first welding surface 2211 and the second surface 226 are arranged at an obtuse angle, which can be understood as each first intersection line Y1 and the second intersection line Y2 are arranged at an obtuse angle.
  • the angle between the first welding surface 2211 and the second surface 226 is defined as ⁇ , that is, the angle between the first intersection line Y1 and the second intersection line Y2 is ⁇ , 90° ⁇ 180°.
  • the first welding surface 2211 and the second surface 226 are arranged at an obtuse angle, so that the receiving groove 221 forms a larger notch near the second surface 226 , which facilitates the first blocking member 30 to enter the receiving groove 221 from the notch of the receiving groove 221 located on the second surface 226 .
  • the angle between the first welding surface 2211 and the second surface 226 is ⁇ , which satisfies 110° ⁇ 160°.
  • can be 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155°, etc.
  • the larger notch formed by the receiving groove 221 near the second surface 226 is not preferred for the size of the electrode terminal 22 of the actual product. If ⁇ is too large, although the larger notch can be formed near the second surface 226 of the receiving groove 221 to facilitate the first blocking member 30 to enter the receiving groove 221, the electrode terminal 22 may be affected in structural strength due to the excessive notch. Therefore, 110° ⁇ 160° can not only make the notch of the receiving groove 221 near the second surface 226 larger, facilitate the first blocking member 30 to enter the receiving groove 221, but also make the structural strength of the electrode terminal 22 meet actual needs.
  • the first welding surface 2211 is connected to the second surface 226 .
  • first welding surface 2211 is directly connected to the second surface 226 .
  • the first welding surface 2211 is connected to the second surface 226 , so that the welding gap 40 extends from the second surface 226 toward the inside of the battery cell 20 , making welding more convenient.
  • the first welding surface 2211 may be indirectly connected to the second surface 226. As shown in FIGS. 10 and 11, the first welding surface 2211 and the second surface 226 are transitionally connected via a first transition surface 227.
  • the first transition surface 227 may be a chamfered inclined surface or a circular chamfered surface 383.
  • FIG. 11 shows a case where the first transition surface 227 is a circular chamfered surface 383.
  • the first blocking member 30 includes a first surface 31 , which is a surface of the first blocking member 30 farthest from the interior of the battery cell along the thickness direction X of the wall, and is flush with the second surface 226 .
  • first surface 31 and the second surface 226 are coplanar, or, along the thickness direction X of the wall, the first surface 31 and the second surface 226 are at the same distance from the same position inside the battery cell 20 .
  • the first surface 31 and the second surface 226 are flush, which is beneficial to reducing the size of the overall structure composed of the electrode terminal 22 and the first blocking member 30 along the thickness direction X of the wall, thereby reducing the size of the battery cell 20 along the thickness direction X of the wall.
  • the first surface 31 may be closer to the interior of the battery cell 20 than the second surface 226 , or the second surface 226 may be closer to the interior of the battery cell 20 than the first surface 31 .
  • the first welding surface 2211 is a first conical surface, and along the thickness direction X of the wall, the large end of the first welding surface 2211 is farther away from the interior of the battery cell 20 than the small end of the first welding surface 2211 .
  • the extending direction of the axis of the first tapered surface may be parallel to the thickness direction X of the wall portion.
  • the first welding surface 2211 is a first conical surface, and the large end of the first welding surface 2211 is farther away from the interior of the battery cell 20 than the small end of the first welding surface 2211, so that the size of the notch of the accommodating groove 221 close to the electrode terminal 22 away from the interior of the battery cell 20 is larger, which facilitates the first sealing member 30 to enter the accommodating groove 221.
  • the second welding surface 32 can be a second conical surface, and along the thickness direction X of the wall, the small end of the second welding surface 32 is farther away from the interior of the battery cell 20 than the large end of the second welding surface 32, then the welding gap 40 that gradually increases in the direction away from the interior of the battery cell 20 is formed at the corresponding position of the first conical surface and the second conical surface, and the cross-section of the welding gap 40 can be triangular.
  • the second welding surface 32 may also be a cylindrical surface, and a welding gap 40 that gradually increases in a direction away from the interior of the battery cell 20 is formed at the corresponding parts of the first conical surface and the second welding surface 32 in the form of a cylindrical surface.
  • the cross-section of the welding gap 40 may be a right triangle.
  • the first conical surface may be a pyramidal surface.
  • the large end and the small end of the first conical surface are both polygonal, for example, the large end and the small end of the first conical surface are both triangles, quadrilaterals, pentagons, hexagons, etc.
  • the first conical surface is a conical surface.
  • the large end and the small end of the first conical surface are both circular, and the diameter of the large end of the first conical surface is greater than the diameter of the small end of the first conical surface.
  • the axis of the conical surface may coincide with the axis of the mounting hole 2111, or may not coincide with it.
  • the first conical surface is a conical surface, which makes processing easier.
  • the structure of the conical surface along its circumference is the same. Therefore, the positioning accuracy requirement of the first sealing member 30 relative to the receiving groove 221 is not high, which facilitates the assembly of the first sealing member 30 and the electrode terminal 22 and improves the assembly efficiency.
  • the first welding surface 2211 may also be a cylindrical surface, and the extension direction of the axis of the cylindrical surface is parallel to the thickness direction X of the wall portion.
  • the first blocking member 30 includes a first surface 31 , which is the surface of the first blocking member 30 farthest from the interior of the battery cell 20 along the thickness direction X of the wall, and the second welding surface 32 is disposed at an obtuse angle to the first surface 31 .
  • intersection of the plane where the reference straight line is located and the second welding surface 32 is the third intersection line Y3, and the intersection of the plane where the reference straight line is located and the first surface 31 is the fourth intersection line Y4.
  • the second welding surface 32 and the first surface 31 are arranged at an obtuse angle, which can be understood as the third intersection line Y3 and the fourth intersection line Y4 are arranged at an obtuse angle.
  • the angle between the second welding surface 32 and the first surface 31 is defined as ⁇ , that is, the angle between the third intersection line Y3 and the fourth intersection line Y4 is ⁇ , which is also 90° ⁇ 180°.
  • can be 100°, 105°, 110°, 120°, 130°, 130°, 140°, 150°, 160°, etc.
  • the second welding surface 32 is arranged at an obtuse angle with the first surface 31 , which is conducive to forming a welding gap 40 with a larger opening on the inner side away from the battery cell 20 , thereby facilitating the welding gun to enter the welding gap 40 and facilitating welding of the electrode terminal 22 and the first sealing member 30 .
  • the second welding surface 32 is connected to the first surface 31 .
  • the second welding surface 32 is directly connected to the first surface 31 .
  • the second welding surface 32 is connected to the first surface 31 , so that the welding gap 40 extends from the first surface 31 toward the inner direction of the battery cell 20 , making welding more convenient.
  • the second welding surface 32 may be indirectly connected to the first surface 31. As shown in FIG16 , the second welding surface 32 and the first surface 31 are transitionally connected via a second transition surface 33.
  • the second transition surface 33 may be a chamfered inclined surface or a circular chamfered surface 383.
  • FIG16 shows a case where the second transition surface 33 is a circular chamfered surface.
  • the second welding surface 32 is a second conical surface, and along the thickness direction X of the wall, the small end of the second welding surface 32 is farther away from the interior of the battery cell 20 than the large end of the second welding surface 32 .
  • the extending direction of the axis of the second tapered surface may be parallel to the thickness direction X of the wall portion.
  • the second tapered surface may be a pyramidal surface or a conical surface.
  • the large end and the small end of the second conical surface are both polygonal, for example, the large end and the small end of the second conical surface are both triangles, quadrilaterals, pentagons, hexagons, etc.
  • the large end and the small end of the second conical surface are both circular, and the diameter of the large end of the second conical surface is larger than the diameter of the small end of the second conical surface.
  • the axis of the conical surface may or may not coincide with the axis of the mounting hole 2111.
  • the second welding surface 32 is a second conical surface, and the small end of the second welding surface 32 is farther away from the interior of the battery cell 20 than the large end of the second welding surface 32 , which is conducive to forming a welding gap 40 with a larger opening, thereby facilitating welding of the electrode terminal 22 and the first blocking member 30 .
  • the first welding surface 2211 can also be a cylindrical surface, and the corresponding parts of the second conical surface and the first welding surface 2211 in the form of a cylindrical surface form a welding gap 40 that gradually increases in the direction away from the interior of the battery cell 20, and the cross-section of the welding gap 40 is a right triangle.
  • the first welding surface 2211 can be a first conical surface, and along the thickness direction X of the wall, the large end of the first conical surface is farther away from the interior of the battery cell 20 than the small end of the first conical surface. Then, a welding gap 40 that gradually increases in a direction away from the interior of the battery cell 20 is formed at the corresponding position of the first conical surface and the second conical surface, and the cross-section of the welding gap 40 is a triangle.
  • the first welding surface 2211 is a first conical surface, and along the thickness direction X of the wall, the large end of the first welding surface 2211 is farther away from the interior of the battery cell 20 than the small end of the first welding surface 2211;
  • the first sealing member 30 also includes a third conical surface 34, which is arranged opposite to the first conical surface, and the third conical surface 34 is connected to the large end of the second conical surface.
  • the large end of the third tapered surface 34 is farther away from the interior of the battery cell 20 than the small end.
  • the large end of the third tapered surface 34 is directly connected to the large end of the second tapered surface.
  • a portion of the first conical surface is arranged corresponding to the second welding surface to form a welding gap 40, and another portion of the first conical surface is arranged opposite to the third conical surface 34.
  • the angle between the third conical surface 34 and the second surface 226 is ⁇ 1 , and ⁇ 1 and ⁇ may be the same or different.
  • the first welding surface 2211 is a first conical surface, and the large end of the first welding surface 2211 is farther away from the interior of the battery cell 20 than the small end of the first welding surface 2211.
  • the second conical surface and the first conical surface form a welding gap 40, and in the thickness direction X of the wall portion, the welding gap 40 gradually increases in the direction away from the interior of the battery cell 20.
  • the size of the end of the welding gap 40 close to the first surface 31 is larger, providing a larger space for the welding gun, thereby facilitating the welding gun to enter the welding gap 40 and facilitating welding.
  • the third conical surface 34 is arranged relative to the first conical surface, so that the shape of the first blocking member 30 can be more closely matched with the shape of the accommodating groove 221, which is convenient for assembly.
  • the second tapered surface is a circular cone surface; and/or the third tapered surface 34 is a circular cone surface.
  • the second and third conical surfaces 34 may be a conical surface, for example, the second conical surface is a conical surface and the third conical surface 34 is a pyramidal surface, or the third conical surface 34 is a conical surface and the second conical surface is a pyramidal surface.
  • the second and third conical surfaces 34 may also both be conical surfaces.
  • the conical surface is easier to process, and the second conical surface and/or the third conical surface 34 are conical surfaces. Then, when the first sealing member 30 enters the receiving groove 221, the structure of the conical surface along its circumference is the same, so that the positioning accuracy requirement of the first sealing member 30 relative to the receiving groove 221 is not high, which facilitates the assembly of the first sealing member 30 and the electrode terminal 22 and improves the assembly efficiency.
  • the first sealing member 30 also includes a first side surface 35, and the first side surface 35 is connected to the large end of the second welding surface 32;
  • the groove side wall of the accommodating groove 221 also includes a first side wall surface 2212, and along the thickness direction X of the wall portion, the first side wall surface 2212 is closer to the interior of the battery cell 20 relative to the first welding surface 2211, and the first side wall surface 2212 is connected to an end of the first welding surface 2211 close to the interior of the battery cell 20;
  • the first side wall surface 2212 is arranged opposite to the first side surface 35, and the first side wall surface 2212 and the first side surface 35 are both cylindrical surfaces extending along the thickness direction X of the wall portion.
  • the first side wall surface 2212 and the first welding surface 2211 are close to one end of the interior of the battery cell 20.
  • the first welding surface 2211 is a first conical surface
  • the first side wall surface 2212 is directly connected to the small end of the first welding surface 2211.
  • the diameter of the first side wall surface 2212 and the diameter of the small end of the first conical surface can be the same.
  • the first side wall surface 2212 and the first side surface 35 may fit together or there may be a gap therebetween.
  • the first side wall surface 2212 and the first side surface 35 are both cylindrical surfaces extending along the thickness direction X of the wall portion, and cylindrical surfaces are easier to process.
  • the maximum dimension of the welding gap 40 is L, satisfying 0.1 mm ⁇ L ⁇ 0.7 mm.
  • the maximum dimension L of the welding gap 40 along the thickness direction X of the wall portion is the distance between the end of the second welding surface 32 along the thickness direction X of the wall portion that is farthest from the interior of the battery cell 20 and the end that is closest to the interior of the battery cell 20.
  • the maximum dimension L of the welding gap 40 along the thickness direction X of the wall portion is the distance between the end of the first welding surface 2211 farthest from the interior of the battery cell 20 along the thickness direction X of the wall portion and the end of the second welding surface 32 closest to the interior of the battery cell 20 along the thickness direction X of the wall portion.
  • the welding portion 50 may extend beyond the second surface 226 of the electrode terminal 22 along the thickness direction X of the wall portion, but may not extend beyond the first surface 31 of the first blocking member 30.
  • L can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, etc.
  • the size of the welding gap 40 along the thickness direction X of the wall is small. In order to prevent the welding portion 50 from exceeding the first surface 31 along the thickness direction X of the wall, the size of the welding portion 50 in the thickness direction X of the wall is also small, which may lead to insufficient welding strength. If L>0.7mm, the size of the welding gap 40 along the thickness direction X of the wall is large, and the welding difficulty increases. Therefore, 0.1mm ⁇ L ⁇ 0.7mm enables the size of the welding portion 50 to meet the welding strength requirements for the electrode terminal 22 and the first blocking member 30, and makes the welding difficulty less.
  • the first sealing member 30 includes a first surface 31, which is the surface of the first sealing member 30 that is farthest from the interior of the battery cell 20 along the thickness direction X of the wall.
  • the first surface 31 is also provided with a groove 36, which is arranged around an axis parallel to the thickness direction X of the wall.
  • the groove 36 is an annular groove arranged around an axis parallel to the wall thickness direction X.
  • the cross-sectional shape of the groove 36 may be U-shaped.
  • the provision of the groove 36 can release the welding stress during the welding process of the electrode terminal 22 and the first sealing member 30, improve the welding quality, and alleviate the deformation of the first sealing member 30 and the electrode terminal 22 during the welding process, as well as improve the circumferential welding stress state of the first sealing member 30 and reduce the risk of welding cracks.
  • the groove 36 is a stepped groove, and the groove 36 includes a first section 361 and a second section 362.
  • the first section 361 is closer to the first surface 31 than the second section 362.
  • the first section 361 extends to the second welding surface 32.
  • the second section 362 is recessed from the groove bottom wall of the first section 361 in a direction away from the first surface 31.
  • the accommodating groove 221 is a stepped groove, and the accommodating groove 221 includes a first groove section 2213 and a second groove section 2214 connected to each other.
  • the first groove section 2213 is farther away from the interior of the battery cell 20 than the second groove section 2214.
  • At least a portion of the first blocking member 30 is accommodated in the first groove section 2213, and the first welding surface 2211 is at least a portion of the groove side wall of the first groove section 2213.
  • first groove section 2213 extends to the second surface 226 of the electrode terminal 22.
  • the second groove section 2214 is recessed from the groove bottom wall of the first groove section 2213 toward the inside of the battery cell 20.
  • the structures of the first groove section 2213 and the second groove section 2214 may be the same or different, and the first groove section 2213 and the second groove section 2214 may be circular grooves, square grooves, etc.
  • the first blocking member 30 may be only accommodated in the first slot section 2213.
  • the first blocking member 30 may also be partially accommodated in the first slot section 2213, and the other part extends into the second slot section 2214.
  • the groove sidewall of the first groove section 2213 is the first welding surface 2211, that is, the first welding surface 2211 is the entirety of the first groove sidewall.
  • the first welding surface 2211 and the first sidewall surface 2212 jointly form the groove sidewall of the first groove section 2213, and the first welding surface 2211 is a part of the groove sidewall of the first groove section 2213.
  • the accommodating groove 221 is a stepped groove, which can not only reduce the size of the electrode terminal 22 along the thickness direction X of the wall, facilitate welding of the electrode terminal 22 and the tab 61 inside the battery cell 20, but also reduce the weight of the electrode terminal 22, thereby reducing the weight of the battery cell 20.
  • the accommodating groove 221 may also only include the first groove section 2213 .
  • the first sealing member 30 includes a connected main body portion 37 and an extension portion 38.
  • the main body portion 37 is accommodated in the first groove section 2213 and abuts against the bottom wall of the first groove section 2213.
  • the extension portion 38 extends from the main body portion 37 to the second groove section 2214.
  • the second welding surface 32 is at least a portion of the outer peripheral surface of the main body portion 37.
  • the first surface 31 is a surface of the main body portion 37 that is farthest from the interior of the battery cell 20 along the thickness direction X of the wall portion.
  • the first blocking member 30 includes the second welding surface 32 and the third conical surface 34
  • the second welding surface 32 and the third conical surface 34 jointly form the outer peripheral surface of the body portion 37.
  • the first blocking member 30 includes the second welding surface 32 and the first side surface 35
  • the second welding surface 32 and the first side surface 35 jointly form the outer peripheral surface of the body portion 37.
  • the main body 37 is accommodated in the first groove section 2213 and abuts against the groove bottom wall of the first groove section 2213, which can limit the first blocking member 30 from moving further toward the inside of the battery cell 20 in the thickness direction X of the wall, facilitating the electrical connection between the current collecting component and the first blocking member 30.
  • the extension portion 38 extends from the main body 37 into the second groove section 2214, and forms a positioning fit from the second groove section 2214, which is conducive to maintaining a stable relative position relationship between the first blocking member 30 and the electrode terminal 22.
  • the first blocking member 30 may also only include a main body portion accommodated in the first groove section 2213 .
  • the extension portion 38 includes a second side surface 381 and a third surface 382 closest to the interior of the battery cell 20 along the thickness direction X of the wall portion, and the second side surface 381 and the third surface 382 are connected by a chamfered surface 383 .
  • the second side surface 381 is arranged around an axis parallel to the thickness direction X of the wall portion.
  • the first side surface 35 is arranged opposite to the groove side wall of the second groove section 2214.
  • the second side surface 381 can be a surface matching the groove side wall of the second groove section 2214.
  • the second side surface 381 can be a cylindrical surface; for another example, if the groove side wall of the second groove section 2214 is a prismatic surface, the second side surface 381 can be a prismatic surface.
  • the second side surface 381 can be a hexagonal prism surface.
  • the third surface 382 is also the surface of the second blocking member 70 that is closest to the inside of the battery cell 20 along the thickness direction X of the wall.
  • the chamfered surface 383 can be a rounded surface or a beveled surface.
  • FIG. 15, FIG. 16, FIG. 19, FIG. 21, and FIG. 23 all show that the chamfered surface 383 is a chamfered inclined surface.
  • the third surface 382 and the second side surface 381 are connected by a chamfered surface 383.
  • the setting of the chamfered surface 383 can not only eliminate burrs on the end of the extension portion 38, but also play a guiding role in the process of the first sealing member 30 entering the receiving groove 221, so as to enable the first sealing member 30 to enter the receiving groove 221 smoothly.
  • the groove sidewall of the second groove segment 2214 is spaced apart from the outer circumferential surface of the extension portion 38 .
  • the second slot section 2214 and the extension portion 38 are clearance-matched, and there is a distance between the slot sidewall of the second slot section 2214 and the outer peripheral surface of the extension portion 38. In this embodiment, there is a distance between the slot sidewall of the second slot section 2214 and the second side surface 381 of the extension portion 38.
  • the groove side wall of the second groove section 2214 is spaced apart from the outer peripheral surface of the extension portion 38 , which facilitates the assembly of the first blocking member 30 and the electrode terminal 22 .
  • the distance between the groove sidewall of the second groove section 2214 and the outer peripheral surface of the extension portion 38 is h, and 0.03 mm ⁇ h ⁇ 0.1 mm.
  • the distance h between the groove sidewall of the second groove section 2214 and the outer peripheral surface of the extension portion 38 is also the distance between the groove sidewall of the second groove section 2214 and the second side surface 381 of the extension portion 38.
  • h can be 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc.
  • h is less than 0.03 mm, the distance between the groove side wall of the second groove section 2214 and the outer peripheral surface of the extension part 38 is too small to be controlled, and a higher requirement is placed on the processing accuracy of the first blocking member 30 and the electrode terminal 22, making the processing more difficult. If h is greater than 0.1 mm, the distance between the groove side wall of the second groove section 2214 and the outer peripheral surface of the extension part 38 is too large, and it is easy to cause a large displacement to one side during the welding process of the first blocking member 30 and the electrode terminal 22, making the welding uneven and affecting the welding quality.
  • 0.03 mm ⁇ h ⁇ 0.1 mm makes the distance between the groove side wall of the second groove section 2214 and the outer peripheral surface of the extension part 38 within a range that is easy to control, and also makes the space for the first blocking member 30 to move in the second groove section 2214 smaller during the welding process of the electrode terminal 22 and the first blocking member 30, thereby improving the welding uniformity and facilitating the improvement of the welding quality.
  • the dimension of the main body portion 37 is n, satisfying 0.7 mm ⁇ n ⁇ 1.5 mm.
  • the dimension n of the main body 37 along the thickness direction X of the wall portion refers to the distance between the first surface 31 and the surface where the main body 37 abuts against the bottom wall of the first groove section 2213 along the thickness direction X of the wall portion, or it can be the distance between the first surface 31 and the bottom wall of the first groove section 2213.
  • n can be 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.
  • n is less than 0.7 mm, the strength of the main body 37 is insufficient and cannot meet the actual use requirements. If n is greater than 1.5 mm, the dimension of the main body 37 along the thickness direction X of the wall is too large, which increases the size of the battery cell 20. Therefore, 0.7 mm ⁇ n ⁇ 1.5 mm can not only make the dimension of the battery cell 20 along the thickness direction X of the wall within a reasonable range, but also ensure the structural strength of the main body 37.
  • the electrode terminal 22 is provided with a liquid injection hole 228 , and the liquid injection hole 228 communicates with the receiving groove 221 and the interior of the battery cell 20 .
  • the injection hole 228 is disposed on the bottom wall of the second groove section 2214 and penetrates the bottom wall of the second groove section 2214. In other embodiments, the injection hole 228 may also be disposed on the side wall of the receiving groove 221. For example, the injection hole 228 is disposed on the side wall of the second groove section 2214 and extends to the side of the second abutting portion 223 away from the connecting portion 224.
  • the injection hole 228 is used to allow the electrolyte to enter the housing 21. Specifically, after the electrolyte enters the receiving groove 221, it is injected into the housing 21 from the injection hole 228.
  • the injection hole 228 is disposed on the electrode terminal 22 , which makes processing more convenient and also prevents the injection hole 228 from being disposed on the housing 21 affecting the structural strength of the housing 21 .
  • the first blocking member 30 can block the injection hole 228 , thereby reducing the risk of electrolyte leakage or external impurities entering the housing 21 through the receiving groove 221 and the injection hole 228 .
  • the injection hole 228 may also be disposed on the wall portion 211 .
  • the battery cell 20 further includes a second blocking member 70 , and at least a portion of the second blocking member 70 is inserted into the liquid injection hole 228 to block the liquid injection hole 228 .
  • the second sealing member 70 may be a rubber nail.
  • the second sealing member 70 is inserted into the injection hole 228, and the hole wall of the injection hole 228 may deform the second sealing member 70, so that the second sealing member 70 is sealed in the injection hole 228.
  • the hole wall of the injection hole 228 may also fit the surface of the second sealing member 70, and the hole wall of the injection hole 228 may not deform the second sealing member 70.
  • the second blocking member 70 may be partially inserted into the liquid injection hole 228 , or may be completely inserted into the liquid injection hole 228 .
  • the second blocking member 70 blocks the liquid injection hole 228, which can reduce the risk of leakage of the battery cell 20, and can also reduce the risk of welding slag falling from the liquid injection hole 228 into the battery cell 20 during the welding process between the first blocking member 30 and the electrode terminal 22.
  • the second blocking member 70 can also play a certain role in heat insulation, reducing the damage to the internal structure and materials of the battery cell 20 caused by high temperature during the welding process between the first blocking member 30 and the electrode terminal 22.
  • the second sealing member 70 can have various structural forms.
  • the second sealing member 70 includes a sealing portion 71 and a limiting portion 72.
  • the sealing portion 71 is inserted into the injection hole 228, and the limiting portion 72 is connected to one end of the sealing portion 71 and is located in the receiving groove 221.
  • the limiting portion 72 is used to abut against the bottom wall of the receiving groove 221.
  • the limiting portion 72 abuts against the bottom wall of the second groove section 2214 of the accommodating groove 221 , and the limiting portion 72 is located on the side of the bottom wall of the second groove section 2214 away from the interior of the battery cell 20 .
  • the limiting portion 72 of the second blocking member 70 abuts against the bottom wall of the accommodating groove 221 , so that the second blocking member 70 can move into the battery cell 20 , reducing the risk of the second blocking member 70 falling into the battery cell 20 .
  • the first blocking member 30 is provided with an escape portion 39 .
  • the escape portion 39 is used to accommodate a portion of the second blocking member 70 .
  • a portion of the second blocking member 70 is inserted into the injection hole 228, and a portion of the second blocking member 70 is located in the receiving groove 221.
  • the avoidance portion 39 is a avoidance groove provided on the first blocking member 30, and the portion of the second blocking member 70 located in the receiving groove 221 is accommodated in the avoidance portion 39.
  • the limiting portion 72 of the second blocking member 70 is accommodated in the receiving groove 221, and the avoidance portion 39 is recessed from the surface of the first blocking member 30 closest to the interior of the battery cell 20 toward a direction away from the interior of the battery cell 20. At least a portion of the limiting portion 72 is accommodated in the avoidance portion 39.
  • the limiting portion 72 may be partially accommodated in the avoidance portion 39, or may be fully accommodated in the avoidance portion 39.
  • the injection hole 228 is arranged on the bottom wall of the second groove section 2214, when a portion of the second sealing member 70 is accommodated in the avoidance portion 39, along the thickness direction X of the wall portion, the surface of the first sealing member 30 closest to the interior of the battery cell 20 (the third surface 382) and the bottom wall of the second groove section 2214 can be abutted or spaced apart.
  • the arrangement of the avoidance portion 39 can reduce the risk of interference between the second blocking member 70 and the first blocking member 30.
  • the avoidance portion 39 accommodates a portion of the second blocking member 70, that is, a portion of the second blocking member 70 is embedded in the first blocking member 30, which is conducive to reducing the size of the overall structure formed by the first blocking member 30 and the second blocking member 70.
  • the first blocking member 30 may not be provided with the avoidance portion 39, and along the thickness direction X of the wall portion, the surface (third surface 382) of the first blocking member 30 closest to the inside of the battery cell 20 may be abutted against or spaced from the surface of the second blocking member 70 farthest from the inside of the battery cell 20.
  • the third surface 382 of the first blocking member 30 and the surface of the limiting portion 72 facing away from the blocking portion 71 are abutted against or spaced from each other.
  • the embodiment of the present application further provides a battery 100, comprising the battery cell 20 provided in any of the above embodiments.
  • the battery 100 may include a plurality of battery cells 20 , which are connected in series, in parallel or in mixed connection via a busbar component.
  • the busbar component is welded to the first surface 31 of the first blocking member 30 of the battery cell 20 .
  • the welding portion 50 between the electrode terminal 22 of the battery cell 20 and the first blocking member 30 does not extend beyond the first surface 31 of the first blocking member 30. Therefore, when the busbar component is connected to the first surface 31 (for example, by welding), the welding portion 50 will not interfere with the busbar component, so that the busbar component and the first surface 31 form a stable connection relationship, thereby forming a stable electrical connection relationship between the first blocking member 30 and the busbar component, which is beneficial to improving the stability of the power output of the battery 100.
  • the embodiment of the present application further provides an electric device, and the electric device includes the battery 100 provided in the above embodiment.
  • the battery 100 provides electric energy to the electric device so that the electric device can perform its function normally.
  • the battery 100 provided in the above embodiment can stably output electric energy, thereby ensuring that the electric equipment can work stably.
  • the embodiment of the present application provides a cylindrical battery, which includes a housing 21, an electrode terminal 22, a first blocking member 30, an electrode assembly 60, and a second blocking member 70.
  • the electrode terminal 22 is insulated and arranged on the wall portion 211 of the housing 21, and the electrode terminal 22 is used to be electrically connected to the tab 61 of the electrode assembly 60.
  • the electrode terminal 22 is provided with a receiving groove 221 on the second surface 226 farthest from the inside of the battery cell 20, and the receiving groove 221 is a stepped groove, and the receiving groove 221 includes a first groove section 2213 and a second groove, and the first groove section 2213 is farther away from the inside of the battery cell 20 than the second groove section 2214.
  • the first welding surface 2211 is the groove side wall of the first groove section 2213, and the first welding surface 2211 is a conical surface, the large end of the first welding surface 2211 is connected to the second surface 226, and the small end of the first welding surface 2211 is connected to the groove bottom wall of the first groove section 2213.
  • the first blocking member 30 includes a main body portion 37 and an extension portion 38 connected to each other.
  • the main body portion 37 is accommodated in the first groove section 2213.
  • the surface of the main body portion 37 connected to the extension portion 38 abuts against the groove bottom wall of the first groove section 2213.
  • the extension portion 38 extends into the second groove section 2214.
  • the first surface 31 of the main body portion 37 farthest from the inside of the battery cell 20 is used for welding connection with the current collecting component.
  • the outer peripheral surface of the main body 37 includes a second welding surface 32 and a third conical surface 34, both of which are conical surfaces.
  • the small end of the second welding surface 32 is directly or indirectly connected to the first surface 31, and the large end of the second welding surface 32 is connected to the large end of the third conical surface 34.
  • a welding gap 40 is formed between a part of the first welding surface 2211 and the second welding surface 32.
  • the electrode terminal 22 and the first blocking member 30 are welded and connected to form a welding portion 50 located in the welding gap 40.
  • the welding portion 50 connects the first welding surface 2211 and the second welding surface 32.
  • the welding portion 50 does not exceed the first surface 31, and another part of the first welding surface 2211 is arranged opposite to the third conical surface 34.
  • the third surface 382 of the extension portion 38 away from the main body 37 and the outer peripheral surface (second side surface 381) of the extension portion 38 are connected by a chamfered surface 383.
  • the bottom wall of the second groove section 2214 is provided with a liquid injection hole 228, the blocking portion 71 of the second blocking member 70 is inserted into the liquid injection hole 228, the limiting portion 72 of the second blocking member 70 is connected to one end of the blocking portion 71 and is located in the second groove section 2214, and the limiting portion 72 abuts against the bottom wall of the second groove section 2214.
  • the third surface 382 of the extension portion 38 is provided with an avoidance portion 39, and at least a part of the limiting portion 72 is accommodated in the avoidance portion 39.
  • the embodiment of the present application provides a cylindrical battery, which includes a housing 21, an electrode terminal 22, a first blocking member 30, an electrode assembly 60, and a second blocking member 70.
  • the electrode terminal 22 is insulated and arranged on the wall portion 211 of the housing 21, and the electrode terminal 22 is used to be electrically connected to the tab 61 of the electrode assembly 60.
  • the electrode terminal 22 is provided with a receiving groove 221 on the second surface 226 farthest from the inside of the battery cell 20, and the receiving groove 221 is a stepped groove, and the receiving groove 221 includes a first groove section 2213 and a second groove, and the first groove section 2213 is farther away from the inside of the battery cell 20 than the second groove section 2214.
  • the groove side wall of the first groove section 2213 includes a first welding surface 2211 and a first side wall surface 2212.
  • the first welding surface 2211 is a conical surface
  • the second side wall surface is a cylindrical surface.
  • the large end of the first welding surface 2211 is connected to the second surface 226, the small end of the first welding surface 2211 is connected to the first side wall surface 2212, and the end of the first side wall surface 2212 away from the first welding surface 2211 is connected to the groove bottom wall of the first groove section 2213.
  • the first blocking member 30 includes a connected body portion 37 and an extension portion 38. The body portion 37 is accommodated in the first groove section 2213.
  • the surface of the body portion 37 connected to the extension portion 38 abuts against the groove bottom wall of the first groove section 2213, and the extension portion 38 extends into the second groove section 2214.
  • the outer peripheral surface of the body portion 37 includes a second welding surface 32 and a first side surface 35.
  • the second welding surface 32 is a conical surface, and the second side surface 381 is a cylindrical surface.
  • the small end of the second welding surface 32 is directly or indirectly connected to the first surface 31, and the large end of the second welding surface 32 is connected to the first side surface 35.
  • the first side surface 35 and the first side wall surface 2212 are arranged opposite to each other.
  • a welding gap 40 is formed between a part of the first welding surface 2211 and the second welding surface 32.
  • the electrode terminal 22 and the first blocking member 30 are welded and connected to form a welding portion 50 located in the welding gap 40.
  • the welding portion 50 connects the first welding surface 2211 and the second welding surface 32.
  • the welding portion 50 does not exceed the first surface 31.
  • Another part of the first welding surface 2211 is arranged opposite to the third conical surface 34.
  • the third surface 382 of the extension portion 38 away from the body portion 37 and the outer peripheral surface (second side surface 381) of the extension portion 38 are connected by a chamfered surface 383.
  • the bottom wall of the second groove section 2214 is provided with a liquid injection hole 228, the blocking portion 71 of the second blocking member 70 is inserted into the liquid injection hole 228, the limiting portion 72 of the second blocking member 70 is connected to one end of the blocking portion 71 and is located in the second groove section 2214, and the limiting portion 72 abuts against the bottom wall of the second groove section 2214.
  • the third surface 382 of the extension portion 38 is provided with an avoidance portion 39, and at least a part of the limiting portion 72 is accommodated in the avoidance portion 39.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

本申请提供了一种电池单体、电池及用电设备,涉及电池技术领域。电池单体包括外壳、电极端子和第一封堵件;电极端子设置于外壳的壁部,电极端子的容纳槽的槽侧壁包括第一焊接面;第一封堵件至少部分容纳于容纳槽内,第一封堵件包括第二焊接面,第二焊接面与第一焊接面之间形成焊接间隙,第一封堵件与电极端子焊接形成的焊接部至少部分位于焊接间隙内。由于焊接部不超出第一表面,在汇流部件与第一表面焊接时,焊接部不会干涉汇流部件,使得汇流部件和第一表面形成稳定的连接关系,有利于提高具备该电池单体的电池输出电能的稳定性。

Description

电池单体、电池及用电设备 技术领域
本申请涉及电池技术领域,具体而言,涉及一种电池单体、电池及用电设备。
背景技术
在追求节能减排的大环境下,电池广泛应用于手机、电脑、电动汽车等用电设备,为用电设备提供电能,电池对用电设备供电的稳定性对用电设备执行相关功能有着重要的意义。因此,如何提高电池供电的稳定性成为本领域技术领域亟待解决的问题。
发明内容
本申请实施例提供一种电池单体、电池及用电设备,以提高电池供电的稳定性。
第一方面,本申请实施例提供一种电池单体,包括外壳、电极端子和第一封堵件;所述外壳包括壁部;所述电极端子设置于所述壁部,所述电极端子沿所述壁部的厚度方向背离所述电池单体内部的表面设有容纳槽,所述容纳槽的槽侧壁包括第一焊接面;所述第一封堵件至少部分容纳于所述容纳槽内,所述第一封堵件包括第二焊接面,所述第二焊接面与所述第一焊接面之间形成焊接间隙,所述第一封堵件与所述电极端子焊接,并形成焊接部,所述焊接部连接所述第一焊接面和所述第二焊接面,并至少部分位于所述焊接间隙内。
上述技术方案中,容纳第一封堵件的容纳槽的槽侧壁包括第一焊接面,第一封堵件具有第二焊接面,第一封堵件与电极端子焊接,并形成焊接部,焊接部连接第一焊接面和第二焊接面,并至少部分位于焊接间隙内,则焊接部可以不沿背离电池单体的内部的方向延伸出焊接间隙或者沿背离电池单体的内部的方向延伸出焊接间隙的部分的尺寸较小,则汇流部件连接于第一封堵件以实现电池单体之间电连接的情况下,在汇流部件与第一封堵件连接(比如焊接)时,由于焊接部不超出焊接间隙或者超出焊接间隙的程度很小,有利于缓解焊接部和汇流部件干涉的问题,有利于汇流部件和第一封堵件形成稳定的连接关系,从而使得第一封堵件和汇流部件之间形成稳定的电连接关系,有利于提高具备该电池单体的电池输出电能的稳定性。
在本申请第一方面的一些实施例中,所述第一封堵件包括第一表面,所述第一表面为所述第一封堵件沿所述壁部的厚度方向最远离所述电池单体的内部的表面,所述焊接部不超出第一表面。
上述技术方案中,焊接部不超出第一表面,则汇流部件连接于第一封堵件的第一表面以实现电池单体之间电连接的情况下,由于焊接部不超出第一表面,则在汇流部件与第一表面连接(比如焊接)时,焊接部不会干涉汇流部件,使得汇流部件和第一表面形成稳定的连接关系,从而使得第一封堵件和汇流部件之间形成稳定的电连接关系,有利于提高具备该电池单体的电池输出电能的稳定性。
在本申请第一方面的一些实施例中,在所述壁部的厚度方向上,所述焊接间隙沿背离所述电池单体内部的方向逐渐增大。
上述技术方案中,在壁部的厚度方向上,焊接间隙沿背离电池单体内部的方向逐渐增大,则沿壁部的厚度方向,焊接间隙靠近第一表面的一端的尺寸较大,为焊枪提供较大的空间,从而方便焊枪进入焊接间隙内,便于焊接。
在本申请第一方面的一些实施例中,沿所述壁部的厚度方向,所述电极端子具有最远离所述电池单体的内部的第二表面,所述容纳槽从所述第二表面向靠近所述电池单体的内部的方向凹陷,所述第一焊接面与所述第二表面呈钝角设置。
上述技术方案中,第一焊接面和第二表面呈钝角设置,则容纳槽在靠近第二表面处形成较大的槽口,便于第一封堵件从容纳槽位于第二表面的槽口进入容纳槽内。
在本申请第一方面的一些实施例中,所述第一焊接面与所述第二表面的夹角为θ,满足110°≤θ≤160°。
上述技术方案中,若θ过小,则容纳槽在靠近第二表面处形成较大的槽口对实际产品的电极端子的尺寸而言不是优选,若是θ过大,则容纳槽在靠近第二表面处虽然能形成较大的槽口以方便第一封堵件进入容纳槽内,但是可能导致电极端子因开槽过大而影响结构强度。因此,110°≤θ≤160°既能使得容纳槽在靠近第二表面处的槽口较大,方便第一封堵件进入容纳槽,又能使得电极端子的结构强度满足实际需求。
在本申请第一方面的一些实施例中,所述第一焊接面连接于所述第二表面。
上述技术方案中,第一焊接面连接于第二表面,使得焊接间隙从第二表面向靠近电池单体的内部延伸,使得焊接更加更方便。
在本申请第一方面的一些实施例中,所述第一封堵件包括第一表面,所述第一表面为所述第一封堵件沿所述壁部的厚度方向最远离所述电池单体的内部的表面,所述第一表面与所述第二表面平齐。
上述技术方案中,第一表面和第二表面平齐,则有利于减小电极端子和第一封堵件组成的整体结构沿壁部的厚度方向的尺寸,从而减小电池单体沿壁部的厚度方向的尺寸。
在本申请第一方面的一些实施例中,所述第一焊接面为第一锥面,沿所述壁部的厚度方向,所述第一焊接面的大端较所述第一焊接面的小端更远离所述电池单体的内部。
上述技术方案中,第一焊接面为第一锥面,第一焊接面的大端较第一焊接面的小端更远离电池单体的内部,使得容纳槽靠近电极端子背离电池单体内部的一侧的槽口的尺寸较大,便于第一封堵件进入容纳槽。
在本申请第一方面的一些实施例中,所述第一锥面为圆锥面。
上述技术方案中,第一锥面为圆锥面,使得加工较为容易,且第一封堵件进入容纳槽内的过程中,圆锥面沿其周向的结构相同,则第一封堵件相对容纳槽的定位精度要求不高,便于第一封堵件和电极端子装配以及提高装配效率。
在本申请第一方面的一些实施例中,所述第一封堵件包括第一表面,所述第一表面为所述第一封堵件沿所述壁部的厚度方向最远离所述电池单体的内部的表面,所述第二焊接面与所述第一表面呈钝角设置。
上述技术方案中,第二焊接面与第一表面呈钝角设置,有利于在背离电池单体的内部一侧形成开口较大的焊接间隙,从而方便焊枪进入焊接间隙内,便于电极端子和第一封堵件焊接。
在本申请第一方面的一些实施例中,所述第二焊接面连接所述第一表面。
上述技术方案中,第二焊接面连接于第一表面,使得焊接间隙从第一表面向靠近电池单体的内部的方向延伸,使得焊接更加更方便。
在本申请第一方面的一些实施例中,所述第二焊接面为第二锥面,沿所述壁部的厚度方向,所述第二焊接面的小端较所述第二焊接面的大端更远离所述电池单体的内部。
上述技术方案中,第二焊接面为第二锥面,第二焊接面的小端较第二焊接面的大端更远离电池单体的内部,有利于形成开口较大的焊接间隙,从而便于电极端子和第一封堵件焊接。
在本申请第一方面的一些实施例中,所述第一焊接面为第一锥面,沿所述壁部的厚度方向,所述第一焊接面的大端较所述第一焊接面的小端更远离所述电池单体的内部;所述第一封堵件还包括第三锥面,所述第三锥面与所述第一锥面相对设置,所述第三锥面连接于所述第二锥面的大端。
上述技术方案中,第一焊接面为第一锥面,第一焊接面的大端较第一焊接面的小端更远离电池单体的内部,第二锥面和第一锥面的部分形成焊接间隙,且在壁部的厚度方向上,该焊接间隙沿背离电池单体内部的方向逐渐增大,则焊接间隙靠近第一表面的一端的尺寸较大,为焊枪提供较大的空间,从而方便焊枪进入焊接间隙内,方便焊接。第三锥面和第一锥面相对布置,能够使得第一封堵件的形状与容纳槽的形状更加贴合,便于装配。
在本申请第一方面的一些实施例中,所述第二锥面为圆锥面;和/或所述第三锥面为圆锥面。
上述技术方案中,在实际生产过程中,圆锥面更容易加工,且第二锥面和/或第三锥面为圆锥面,则第一封堵件进入容纳槽内的过程中,圆锥面沿其周向的结构相同,使得第一封堵件相对容纳槽的定位精度要求不高,便于第一封堵件和电极端子装配以及提高装配效率。
在本申请第一方面的实施例中,所述第一封堵件还包括第一侧面,所述第一侧面连接于所述第二焊接面的大端;所述容纳槽的槽侧壁还包括第一侧壁面,沿所述壁部的厚度方向,所述第一侧壁面相对所述第一焊接面更靠近所述电池单体的内部,所述第一侧壁面连接于所述第一焊接面靠近所述电池单体的内部的一端;所述第一侧壁面与所述第一侧面相对布置,所述第一侧壁面和所述第一侧面均为沿所述壁部的厚度方向延伸的圆柱面。
上述技术方案中,第一侧壁面和第一侧面均为沿壁部的厚度方向延伸的圆柱面,圆柱面加工更加容易。
在本申请第一方面的一些实施例中,沿所述壁部的厚度方向,所述焊接间隙的最大尺寸为L,满足0.1mm≤L≤0.7mm。
上述技术方案中,若L>0.1mm,则沿壁部的厚度方向,焊接间隙的尺寸较小,为了使得焊接部沿壁部的厚度方向不超出第一表面,则焊接部在壁部的厚度方向的尺寸也较小,可能导致焊接强度不足,若是L>0.7mm,则沿壁部的厚度方向,焊接间隙的尺寸较大,焊接难度增加。因此,0.1mm≤L≤0.7mm,使得焊接部的尺寸能够满足对电极端子和第一封堵件的焊接强度要求,且使得焊接难度较小。
在本申请第一方面的一些实施例中,所述第一封堵件包括第一表面,所述第一表面为所述第一封堵件沿所述壁部的厚度方向最远离所述电池单体的内部的表面,所述第一表面还设有凹槽,所述凹槽围绕与所述壁部的厚度方向平行的轴线设置。
上述技术方案中,凹槽的设置能够释放电极端子和第一封堵件焊接过程中的焊接应力,提高焊接质量以及缓解第一封堵件和电极端子在焊接过程中的变形。
在本申请第一方面的一些实施例中,所述容纳槽为阶梯槽,所述容纳槽包括相连的第一槽段和第二槽段,所述第一槽段较所述第二槽段更远离所述电池单体的内部,所述第一封堵件的至少一部分容纳于所述第一槽段,所述第一焊接面为所述第一槽段的槽侧壁的至少一部分。
上述技术方案中,容纳槽为阶梯槽,不仅能够减小电极端子沿壁部的厚度方向的尺寸,方便电极端子和电池单体内部的极耳焊接,还能减轻电极端子的重量,从而减轻电池单体的重量。
在本申请第一方面的一些实施例中,所述第一封堵件包括相连的本体部和延伸部,所述本体部容纳于所述第一槽段并与所述第一槽段的槽底壁相抵,所述延伸部从所述本体部延伸至所述第二槽段内,所述第二焊接面为所述本体部的外周面的至少一部分。
上述技术方案中,本体部容纳于第一槽段并与第一槽段的槽底壁相抵,能够限制第一封堵件在壁部的厚度方向进一步向靠近电池单体内部的方向移动,便于汇流部件和第一封堵件电连接。延伸部从本体部延伸至第二槽段内,从第二槽段形成定位配合,有利于第一封堵件和电极端子保持稳定的相对位置关系。
在本申请第一方面的一些实施例中,所述延伸部包括第二侧面和沿所述壁部的厚度方向最靠近所述电池单体的内部的第三表面,所述第二侧面和所述第三表面通过倒角面相连。
上述技术方案中,第三表面和第二侧面通过倒角面相连,倒角面的设置不仅能够消除延伸部端部的毛刺,还能在第一封堵件进入容纳槽的过程中起到导向的作用,以使第一封堵件顺利进入容纳槽。
在本申请第一方面的一些实施例中,所述第二槽段的槽侧壁与所述延伸部的外周面间隔设置。
上述技术方案中,第二槽段的槽侧壁与延伸部的外周面间隔设置,便于第一封堵件和电极端子装配。
在本申请第一方面的一些实施例中,所述第二槽段的槽侧壁与所述延伸部的外周面之间的距离为h, 0.03mm≤h≤0.1mm。
上述技术方案中,若h<0.03mm,则第二槽段的槽侧壁和延伸部的外周面之间的距离太小难以控制,且对第一封堵件和电极端子的加工精度提出了更高的要求,加工难度更大,若h>0.1mm,第二槽段的槽侧壁和延伸部的外周面之间的距离过大,在第一封堵件和电极端子焊接的过程中容易向一侧发生较大位移,使得焊接不均匀,影响焊接质量。因此,0.03mm≤h≤0.1mm,使得第二槽段的槽侧壁和延伸部的外周面之间的距离在便于控制的范围之内,还使得电极端子和第一封堵件焊接过程中,第一封堵件在第二槽段内移动的空间较小,从而提高焊接均匀性,有利于提高焊接质量。
在本申请第一方面的一些实施例中,沿所述壁部的厚度方向,所述本体部的尺寸为n,满足0.7mm≤n≤1.5mm。
上述技术方案中,若n<0.7mm,则本体部的强度不足,不能满足实际使用要求,若n>1.5mm,则本体部沿壁部的厚度方向的尺寸太大,增大了电池单体的尺寸。因此,0.7mm≤n≤1.5mm,既能使电池单体沿壁部的厚度方向的尺寸在合理的范围之内,还能保证本体部的结构强度。
在本申请第一方面的一些实施例中,所述电极端子设置有注液孔,所述注液孔连通所述容纳槽和所述电池单体的内部。
上述技术方案中,注液孔设置于电极端子,使得加工更加方便,还能避免注液孔设置在外壳上影响外壳的结构强度。
在本申请第一方面的一些实施例中,所述电池单体还包括第二封堵件,所述第二封堵件的至少一部分插设于所述注液孔,以使封堵所述注液孔。
上述技术方案中,第二封堵件封堵注液孔,能够降低电池单体漏液的风险,还能降低第一封堵件和电极端子焊接过程中焊渣从注液孔掉入电池单体内部的风险。第二封堵件还能起到一定的隔热作用,降低第一封堵件和电极端子焊接过程中高温对电池单体内部结构和物质的损害。
在本申请第一方面的一些实施例中,所述第二封堵件包括封堵部和限位部,所述封堵部插设于所述注液孔,所述限位部连接于所述封堵部的一端并位于所述容纳槽内,所述限位部用于与所述容纳槽的槽底壁相抵。
上述技术方案中,第二封堵件的限位部与容纳槽的槽底壁相抵,能够现在第二封堵件向电池单体内部移动,降低第二封堵件掉入电池单体内部的风险。
在本申请第一方面的一些实施例中,所述第一封堵件设有避让部,所述避让部用于容纳所述第二封堵件的一部分。
上述技术方案中,避让部的设置能够降低第二封堵件和第一封堵件干涉的风险。避让部容纳第二封堵件的一部分,即第二封堵件的一部分嵌入到第一封堵件中,有利于减小第一封堵件和第二封堵件形成的整体结构的尺寸。
第二方面,本申请实施例还提供一种电池,包括第一方面实施例提供的电池单体。
上述技术方案中,第一方面实施例中的电池单体的电极端子和第一封堵件焊接的焊接部不超出第一封堵件的第一表面,则在汇流部件与第一表面连接(比如焊接)时,焊接部不会干涉汇流部件,使得汇流部件和第一表面形成稳定的连接关系,从而使得第一封堵件和汇流部件之间形成稳定的电连接关系,有利于提高电池输出电能的稳定性。
第三方面,本申请实施例还提供一种用电设备,包括第二方面实施例提供的电池。
上述技术方案中,第二方面实施例提供的电池能够稳定的输出电能,从而保证用电设备能够稳定的工作。
附图说明
为了更清楚地说明本申请实施例的技术方案,下面将对实施例中所需要使用的附图作简单地介绍,应当理解,以下附图仅示出了本申请的某些实施例,因此不应被看作是对范围的限定,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他相关的附图。
图1为相关技术中第一封堵件和汇流部件焊接的示意图;
图2为本申请一些实施例提供的车辆的结构示意图;
图3为本申请一些实施例提供的电池的分解图;
图4为本申请一些实施例提供的电池单体的分解图;
图5为本申请一些实施例提供的壁部、电极端子和第一封堵件装配后的示意图;
图6为图5中A处的放大图;
图7为图5中电极端子和第一封堵件焊接后的结构示意图;
图8为图7中B处的放大图;
图9为本申请一些实施例提供的电极端子的结构示意图;
图10为本申请另一些实施例提供的电极端子和第一封堵件焊接后的结构示意图;
图11为图10中C处的放大图;
图12为本申请一些实施例提供的电极端子的剖视图;
图13为本申请再一些实施例提供的电极端子和第一封堵件焊接后的示意图;
图14为本申请又一些实施例提供的电极端子和第一封堵件焊接后的示意图;
图15为本申请一些实施例提供的第一封堵件的剖视图;
图16为本申请另一些实施例提供的第一封堵件的剖视图;
图17为本申请再另一些实施例提供的电极端子和第一封堵件焊接后的示意图;
图18为图17中D处的放大图;
图19为本申请再一些实施例中提供的电极端子和第一封堵件焊接后的示意图;
图20为图19中E处的放大图;
图21为本申请再又一些实施例中提供的电极端子和第一封堵件的焊接后的示意图;
图22为图21中F处的放大图;
图23为本申请再一些实施例提供的电极端子和第一封堵件装配后的示意图;
图24为图23中G处的放大图;
图25为本申请再一些实施例提供的电极端子和第一封堵件配合的示意图;
图26为本申请另又一些实施例提供的电极端子和第一封堵件配合后的结构示意图;
图27为本申请再一些实施例提供的电极端子和第一封堵件配合后的结构示意图。
图标:1000-车辆;100-电池;10-箱体;11-第一部分;12-第二部分;20-电池单体;21-外壳;211'、211-壁部;2111-安装孔;212-壳体;2121-开口;213-端盖;22'、22-电极端子;221'、221-容纳槽;2211-第一焊接面;2212-第一侧壁面;2213-第一槽段;2214-第二槽段;222-第一抵靠部;223-第二抵靠部;224-连接部;225-环形卡槽;226-第二表面;227-第一过渡面;228-注液孔;23-绝缘件;30'、30-第一封堵件;31'、31-第一表面;32-第二焊接面;33-第二过渡面;34-第三锥面;35-第一侧面;36-凹槽;361-第一段;362-第二段;37-本体部;38-延伸部;381-第二侧面;382-第三表面;383-倒角面;39-避让部;40-焊接间隙;50'、50-焊接部;60-电极组件;61-极耳;70-第二封堵件;71-封堵部;72-限位部;200-控制器;300-马达;X-壁部的厚度方向;Y1-第一交线;Y2-第二交线;Y3-第三交线;Y4-第四交线;400'-汇流部件。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚,下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例是本申请一部分实施例,而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以以各种不同的配置来布置和设计。
因此,以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围,而是仅仅表示本申请的选定实施例。基于本申请中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本申请保护的范围。
需要说明的是,在不冲突的情况下,本申请中的实施例及实施例中的特征可以相互组合。
应注意到:相似的标号和字母在下面的附图中表示类似项,因此,一旦某一项在一个附图中被定义,则在随后的附图中不需要对其进行进一步定义和解释。
在本申请实施例的描述中,需要说明的是,指示方位或位置关系为基于附图所示的方位或位置关系,或者是该申请产品使用时惯常摆放的方位或位置关系,或者是本领域技术人员惯常理解的方位或位置关系,仅是为了便于描述本申请和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本申请的限制。此外,术语“第一”、“第二”、“第三”等仅用于区分描述,而不能理解为指示或暗示相对重要性。
目前,从市场形势的发展来看,动力电池的应用越加广泛。动力电池不仅被应用于水力、火力、风力和太阳能电站等储能电源系统,而且还被广泛应用于电动自行车、电动摩托车、电动汽车等电动交通工具,以及军事装备和航空航天等多个领域。随着动力电池100应用领域的不断扩大,其市场的需求量也在不断地扩增。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如,本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
本申请中出现的“多个”指的是两个以上(包括两个)。
本申请中,电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等,本申请实施例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等,本申请实施例对此也不限定。电池单体一般按封装的方式分成三种:柱形电池单体、方体方形电池单体和软包电池单体,本申请实施例对此也不限定。
在电池包括多个电池单体的实施例中,多个电池单体通过汇流部件串联、并联或者混联,混联是指多个电池单体中既有串联又有并联。
电池单体20'包括外壳21'、电极端子22'和电极组件60',电极组件60'容纳于外壳21'内,电极端子22'设置于外壳21'的壁部211',电极端子22'用于与电极组件60'电连接。汇流部件400'与电池单体20'的电极端子22'电连接从而实现多个电池单体20串联、并联或者混联。
如图1所示,汇流部件400'一般不与电极端子22'直接连接,而是在通过在电极端子22'上焊接第一封堵件30',汇流部件400'与第一封堵件30'直接连接,从而实现电极端子22'和汇流部件400'通过第一封堵件30'实现电连接。为了减小电极端子22'和第一封堵件30'形成的整体结构的尺寸,沿壁部的厚度方向X,电极端子22'背离电池单体20'的内部的表面上设有容纳槽221',第一封堵件30'的至少部分容纳于容纳槽221'内,沿壁部的厚度方向X,第一封堵件30'最远离电池单体20'的内部的第一表面31'用于与汇流部件400'焊接,从而实现电连接。
发明人发现,如图1所示,第一封堵件30'和电极端子22'焊接后会形成焊接部50',焊接部50'会凸出第一封堵件30'的第一表面31',当汇流部件400'与第一表面31'焊接时,汇流部件400'会顶住汇流部件400'面向第一封堵件30'的一侧,影响汇流部件400'与第一封堵件30'之间的焊接质量,可能导致汇流部件400'和第一表面31'之间虚 焊,从而使得第一封堵件30'和汇流部件400'之间的电连接关系不稳定,甚至失效。
基于上述考虑,为了缓解因电极端子和第一封堵件焊接形成的焊接部凸出第一封堵件的第一表面而汇流部件和第一表面可能虚焊的问题,发明人经过深入研究,设计了一种电池单体,沿外壳的壁部的厚度方向,电极端子背离电池单体内部的表面设置的容纳槽的槽侧壁包括第一焊接面;第一封堵件包括第二焊接面,第二焊接面与第一焊接面之间形成焊接间隙,第一封堵件与电极端子焊接,并形成焊接部,焊接部连接第一焊接面和第二焊接面,并至少部分位于焊接间隙内。
容纳第一封堵件的容纳槽的槽侧壁包括第一焊接面,第一封堵件具有第二焊接面,第一封堵件与电极端子焊接,并形成焊接部,焊接部连接第一焊接面和第二焊接面,并至少部分位于焊接间隙内,则焊接部可以不沿背离电池单体的内部的方向延伸出焊接间隙或者沿背离电池单体的内部的方向延伸出焊接间隙的部分的尺寸较小,则汇流部件连接于第一封堵件以实现电池单体之间电连接的情况下,由于焊接部不超出第一表面,则在汇流部件与第一封堵件连接(比如焊接)时,由于焊接部不超出焊接间隙或者超出焊接间隙的程度很小,有利于缓解焊接部和汇流部件干涉的问题,有利于汇流部件和第一封堵件形成稳定的连接关系,从而使得第一封堵件和汇流部件之间形成稳定的电连接关系,有利于提高具备该电池单体的电池输出电能的稳定性。
本申请实施例公开的电池单体可以但不限用于车辆、船舶或飞行器等用电设备中。可以使用具备本申请公开的电池单体、电池等组成该用电设备的电源系统,这样,有利于提高电池电能输出的稳定性。
本申请实施例提供一种使用电池作为电源的用电装置,用电装置可以为但不限于手机、平板、笔记本电脑、电动玩具、电动工具、电瓶车、电动汽车、轮船、航天器等等。其中,电动玩具可以包括固定式或移动式的电动玩具,例如,游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等,航天器可以包括飞机、火箭、航天飞机和宇宙飞船等等。
以下实施例为了方便说明,以本申请一实施例的一种用电装置为车辆1000为例进行说明。
请参照图2,图2为本申请一些实施例提供的车辆1000的结构示意图。车辆1000可以为燃油汽车、燃气汽车或新能源汽车,新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等。车辆1000的内部设置有电池100,电池100可以设置在车辆1000的底部或头部或尾部。电池100可以用于车辆1000的供电,例如,电池100可以作为车辆1000的操作电源。车辆1000还可以包括控制器200和马达300,控制器200用来控制电池100为马达300供电,例如,用于车辆1000的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中,电池100不仅可以作为车辆1000的操作电源,还可以作为车辆1000的驱动电源,代替或部分地代替燃油或天然气为车辆1000提供驱动动力。
请参照图3,图3为本申请一些实施例提供的电池100的爆炸图。电池100包括箱体10和电池单体20,电池单体20容纳于箱体10内。其中,箱体10用于为电池单体20提供容纳空间,箱体10可以采用多种结构。在一些实施例中,箱体10可以包括第一部分11和第二部分12,第一部分11与第二部分12相互盖合,第一部分11和第二部分12共同限定出用于容纳电池单体20的容纳空间。第二部分12可以为一端开口以形成容纳电池单体20的容纳腔的空心结构,第一部分11可以为板状结构,第一部分11盖合于第二部分12的开口侧,以使第一部分11与第二部分12共同限定出容纳空间;第一部分11和第二部分12也可以是均为一侧开口以形成容纳电池单体20的容纳腔的空心结构,第一部分11的开口侧盖合于第二部分12的开口侧。当然,第一部分11和第二部分12形成的箱体10可以是多种形状,比如,圆柱体、长方体等。
在电池100中,电池单体20可以是多个,多个电池单体20之间可串联或并联或混联,混联是指多个电池单体20中既有串联又有并联。多个电池单体20之间可直接串联或并联或混联在一起,再将多个电池单体20构成的整体容纳于箱体10内;当然,电池100也可以是多个电池单体20先串联或并联或混联组成电池模块形式,多个电池模块再串联或并联或混联形成一个整体,并容纳于箱体10内。电池100还可以包括其他结构,例如,该电池100可以包括汇流部件(图2中未示出),用于实现多个电池单体20之间的电连接。
其中,每个电池单体20可以为二次电池或一次电池;还可以是锂硫电池、钠离子电池或镁离子电池,但不局限于此。电池单体20可呈圆柱体、扁平体、长方体或其它形状等。
如图4-图8所示,在一些实施例中,电池单体20包括外壳21、电极端子22和第一封堵件30;外壳21包括壁部211;电极端子22设置于壁部211,电极端子22沿壁部的厚度方向X背离电池单体20内部的表面设有容纳槽221,容纳槽221的槽侧壁包括第一焊接面2211;第一封堵件30至少部分容纳于容纳槽221内,第一封堵件30包括第二焊接面32,第二焊接面32与第一焊接面2211之间形成焊接间隙40,第一封堵件30与电极端子22焊接,并形成焊接部50,焊接部50连接第一焊接面2211和第二焊接面32,并至少部分位于焊接间隙40内。
如图4所示,外壳21包括壳体212和端盖213,壳体212的一端具有开口2121,端盖213用于封盖壳体212的开口2121,以使端盖213和壳体212共同形成容纳电极组件60的容纳空间。不限地,端盖213的形状可以与壳体212的形状相适应以配合壳体212。可选地,端盖213可以由具有一定硬度和强度的材质(如铝合金)制成,这样,端盖213在受挤压碰撞时就不易发生形变,使电池单体20能够具备更高的结构强度,安全性能也可以有所提高。
壳体212是用于配合端盖213以形成电池单体20的内部环境的组件,其中,形成的内部环境可以用于容纳电极组件60、电解液以及其他部件。壳体212和端盖213可以是独立的部件,可以于壳体212上设置开口2121,通过在开口2121处使端盖213盖合开口2121以形成电池单体20的内部环境。不限地,也可以使端盖213和壳体212一体化,具体地,端盖213和壳体212可以在其他部件入壳前先形成一个共同的连接面,当需要封装壳体212的内部时,再使端盖213盖合壳体212。壳体212可以是多种形状和多种尺寸的,例如长方体形、圆柱体形、六棱柱形等。具体地,壳体212的形状可以根据电极组件60的具体形状和尺寸大小来确定。壳体212的材质可以是多种,比如,铜、铁、铝、不锈钢、铝合金、塑胶等,本申请实施例对此不作特殊限制。
电极组件60是电池单体20中发生电化学反应的部件。壳体212内可以包含一个或更多个电极组件60。电极组件60主要由正极片和负极片卷绕或层叠放置形成,并且通常在正极片与负极片之间设有隔膜。正极片和负极片具有活性物质的部分构成电极组件60的主体部,正极片和负极片不具有活性物质的部分各自构成极耳61。正极耳61和负极耳61可以共同位于主体部的一端或是分别位于主体部的两端。在电池100的充放电过程中,正极活性物质和负极活性物质与电解液发生反应,极耳61连接电极端子22以形成电流回路。
设置电极端子22的壁部211可以是端盖213,也可以是壳体212的壁。图4中示出了电极端子22设置于端盖213的情况,即端盖213为设置电极端子22的壁部211。
电极端子22是一种功能性部件。电极端子22可以用于与容纳于外壳21内的电极组件60电连接,以用于输出或输入电池单体20的电能。
在设置电极端子22的壁部211为端盖213的实施例中,端盖213上还可以设置有用于在电池单体20的内部压力或温度达到阈值时泄放内部压力的泄压机构。端盖213的材质也可以是多种的,比如,铜、铁、铝、不锈钢、铝合金、塑胶等,本申请实施例对此不作特殊限制。在一些实施例中,在端盖213的内侧还可以设置有绝缘件23,绝缘件23可以用于隔离壳体212内的电连接部224件与端盖213,以降低短路的风险。示例性的,绝缘件23可以是塑料、橡胶等。
如4、图5、图7所示,壁部211设有安装孔2111,沿壁部的厚度方向X,安装孔2111贯穿壁部211的两侧。安装孔2111的形状可以有多种,比如安装孔2111为圆孔、方形孔、锥形孔等。图4、图5、图7中示出了安装孔2111为圆孔的情况。
电极端子22穿设于安装孔2111内。电极端子22包括第一抵靠部222、第二抵靠部223和连接部224,沿壁部的厚度方向X,连接部224的两端分别与第一抵靠部222和第二抵靠部223连接。第一抵靠部222围绕连接部224的外周延伸并凸出连接部224的外周面,第二抵靠部223围绕连接部224的外周延伸并凸出连接部224的外周面,第一抵靠部222、第二抵靠部223和连接部224共同形成环形卡槽225,壁部211卡设于环形卡槽225内。连接部224穿设于安装孔2111内,第一抵靠部222和第二抵靠部223分别位于壁部211的两侧,第一抵靠部222和第二抵靠部223分别与壁部211的两个相对的表面相抵,从而起到限位作用,以使电极端子22稳定的设置在壁部211上。连接部224的结构形状可以安装孔2111的结构形状相匹配,比如,安装孔2111为圆形孔,则连接部224可以为圆柱结构,安装孔2111为圆锥形孔,则连接部224可以为圆锥结构。第二抵靠部223位于壁部211面向电池单体20的内部的一侧,第一抵靠部222位于壁部211背离电池单体20的内部一侧。第一抵靠部222和第二抵靠部223的结构形式有多种,比如第一抵靠部222为圆环结构,第二抵靠部223为圆盘结构。第一抵靠部222和第二抵靠部223的结构可以相同也可以不同。图3中示出了第一抵靠部222为圆环结构,第二抵靠部223为圆盘结构,且第一抵靠部222的外径小于第二抵靠部223的外径的情况。
第一抵靠部222、第二抵靠部223和连接部224可以是分体设置,再连接为整体结构,比如通过焊接连接、粘接连接等方式连接为整体结构。第一抵靠部222、第二抵靠部223和连接部224也可以是一体成型,比如通过冲压、浇筑等一体成型方式形成。第一抵靠部222可以是连接部224延伸出安装孔2111的部分形成的翻边结构。
壁部211可以绝缘设置一个电极端子22,电极组件60的正极耳和负极耳中的一者可以与电极端子22电连接,正极耳和负极耳中的另一者可以和壳体212电连接。
在另一些实施例中,壁部211上可以绝缘设置有两个电极端子22,两个电极端子22分别与电极组件60的正极耳和负极耳电连接。
在壁部的厚度方向X上,容纳槽221从电极端子22最远离电池单体20的内部的表面向靠近电池单体20内部的方向凹陷,容纳槽221可以延伸至电极端子22面向电池单体20内部的表面的一侧,即沿壁部的厚度方向X,容纳槽221贯穿电极端子22相对的两侧,形成通孔。如图6、图7所示,容纳槽221也可以不延伸至电极端子22面向电池单体20内部的表面的一侧。
容纳槽221的槽侧壁是指容纳槽221的槽底壁以外的壁面。容纳槽221的槽底壁是指容纳槽221的垂直壁部的厚度方向X的壁面。第一焊接面2211为容纳槽221的槽侧壁的至少一部分。
第一封堵件30可以全部容纳于容纳槽221内,也可以仅一部分容纳于容纳槽221内。第一封堵件30包括第一表面31,第一表面31为第一封堵件30沿壁部的厚度方向X最远离电池单体20的内部的表面,第一表面31可以位于容纳槽221内,也可以位于容纳槽221外。
沿壁部的厚度方向X,第一表面31也可以与电极端子22最远离电池单体20内部的表面平齐。汇流部件(图4-图8中未示出)可以与第一表面31焊接连接或者抵接接触,以实现汇流部件和第一封堵件30电连接。第二焊接面32在平行壁部的厚度方向X的平面内的投影和第一焊接面2211在平行壁部211的方向的平面内的投影至少部分重叠,第一焊接面2211和第二焊接面32投影重叠的区域之间形成焊接间隙40。电极端子22和第一封堵件30在焊接间隙40内焊接。焊接部50可以全部位于焊接间隙40内,焊接部50也可以是一部分容纳于焊接间隙40内,另一部分在壁部的厚度方向X上沿背离电池单体20的内部方向延伸出焊接间隙40。
如图9所示,在一些实施例中,第一焊接面2211可以是围绕平行壁部的厚度方向X的轴线设置的闭环面,第二焊接面32可以是围绕平行壁部的厚度方向X的轴线设置的闭环面,则焊接间隙40可以是围绕平行壁部的厚度方向X的轴线的环形间隙,焊接部50可以是位于焊接间隙40内的且与焊接间隙40的延伸驱使一致的环形结构,以使焊接部50不仅能够连接电极端子22和第一封堵件30,在第一封堵件30和电极端子22之间起到密封作用。
容纳第一封堵件30的容纳槽221的槽侧壁包括第一焊接面2211,第一封堵件30具有第二焊接面32,第一封堵件30与电极端子22焊接,并形成焊接部50,焊接部50连接第一焊接面2211和第二焊接面32,并至少部分位于焊接间隙40内,则焊接部50可以不沿背离电池单体20的内部的方向延伸出焊接间隙40或者沿背离电池单体 20的内部的方向延伸出焊接间隙40的部分的尺寸较小,则汇流部件连接于第一封堵件30以实现电池单体20之间电连接的情况下,在汇流部件与第一封堵件30连接(比如焊接连接)时,由于焊接部50不超出焊接间隙40或者超出焊接间隙40的程度很小,有利于缓解焊接部50和汇流部件干涉的问题,使得汇流部件和第一封堵件30形成稳定的连接关系,从而使得第一封堵件30和汇流部件之间形成稳定的电连接关系,有利于提高具备该电池单体20的电池100输出电能的稳定性。
在一些实施例中,第一封堵件30包括第一表面31,第一表面31为第一封堵件30沿壁部的厚度方向X最远离电池单体20的内部的表面,焊接部50不超出第一表面31。
沿壁部的厚度方向X,焊接间隙40具有一定的深度,焊接部50位于焊接间隙40内,以使在壁部的厚度方向X上,焊接部50不超出第一表面31。沿壁部的厚度方向X,焊接部50最远离电池单体20的内部的一端可以与第一表面31平齐,或者沿壁部的厚度方向X,焊接部50最远离电池单体20的内部的一端相较于第一表面31更靠近电池单体20的内部,以使焊接部50沿背离电池单体20的方向不超出第一表面31。
焊接部50不超出第一表面31,则汇流部件连接于第一封堵件30的第一表面31以实现电池单体20之间电连接的情况下,由于焊接部50不超出第一表面31,则在汇流部件与第一表面31连接(比如焊接)时,焊接部50不会干涉汇流部件,使得汇流部件和第一表面31形成稳定的连接关系,从而使得第一封堵件30和汇流部件之间形成稳定的电连接关系,有利于提高具备该电池单体20的电池输出电能的稳定性。
在一些实施例中,焊接间隙40为等尺寸结构,焊接间隙40的尺寸是指沿垂直壁部的厚度方向X的方向,第一焊接面2211和第二焊接面32之间的距离,焊接间隙40任意位置的尺寸相同,以使便于控制焊接部50的尺寸,从而方便焊接和有利于提高焊接质量。
如图6、图8所示,在另一些实施例中,在壁部的厚度方向X上,焊接间隙40沿背离电池单体20内部的方向逐渐增大。
即,沿壁部的厚度方向X,焊接间隙40为变尺寸结构,第一焊接面2211和第二焊接面32之间的距离沿背离电池单体20内部的方向逐渐增大,则焊接间隙40背离电池单体20内部一端尺寸大于焊接间隙40靠近电池单体20内部的一端的尺寸。
因此,在壁部的厚度方向X上,焊接间隙40沿背离电池单体20内部的方向逐渐增大,则沿壁部的厚度方向X,焊接间隙40靠近第一表面31的一端的尺寸较大,为焊枪提供较大的空间,从而方便焊枪进入焊接间隙40内,便于焊接。
如图6、图7、图8、图9所示,在一些实施例中,沿壁部的厚度方向X,电极端子22具有最远离电池单体20的内部的第二表面226,容纳槽221从第二表面226向靠近电池单体20的内部的方向凹陷,第一焊接面2211与第二表面226呈钝角设置。
容纳槽221从第二表面226向靠近电池单体20的内部的方向凹陷,则容纳槽221在第二表面226上形成槽口。第二表面226和第一表面31可以共面,这种实施例中,第一封堵件30可以全部容纳于容纳槽221内。或者,沿壁部的厚度方向X,第二表面226相对第一表面31更加靠近电池单体20内部,这种实施例中,第一封堵件30的一部分容纳与容纳槽221内。或者,沿壁部的厚度方向X,第一表面31相对第二表面226更加靠近电池单体20内部,这种实施例中,第一封堵件30可以全部容纳于容纳槽221内。图6、图7、图8中示出了第一表面31和第二表面226共面的情况。
如图8所示,定义与壁部的厚度方向X平行的直线为参考直线,参考直线所在平面与第一焊接面2211的交线为第一交线Y1,参考直线所在平面与第二表面226的交线为第二交线Y2。第一焊接面2211与第二表面226呈钝角设置,可以理解为,每个第一交线Y1和第二交线Y2呈钝角设置。
定义第一焊接面2211和第二表面226之间的夹角为θ,即第一交线Y1和第二交线Y2的夹角为θ,90°<θ<180°。
第一焊接面2211和第二表面226呈钝角设置,则容纳槽221在靠近第二表面226处形成较大的槽口,便于第一封堵件30从容纳槽221位于第二表面226的槽口进入容纳槽221内。
在第一焊接面2211和第二表面226呈钝角布置的实施例中,第一焊接面2211与第二表面226的夹角为θ,满足110°≤θ≤160°。
比如θ可以为110°、115°、120°、125°、130°、135°、140°、145°、150°、155°等。
若θ过小,则容纳槽221在靠近第二表面226处形成较大的槽口对实际产品的电极端子22的尺寸而言不是优选,若是θ过大,则容纳槽221在靠近第二表面226处虽然能形成较大的槽口以方便第一封堵件30进入容纳槽221内,但是可能导致电极端子22因开槽过大而影响结构强度。因此,110°≤θ≤160°既能使得容纳槽221在靠近第二表面226处的槽口较大,方便第一封堵件30进入容纳槽221,又能使得电极端子22的结构强度满足实际需求。
如图8、图9所示,在一些实施例中,第一焊接面2211连接于第二表面226。
可以理解地,第一焊接面2211与第二表面226直接相连。
第一焊接面2211连接于第二表面226,使得焊接间隙40从第二表面226向靠近电池单体20的内部延伸,使得焊接更加更方便。
在另一些实施例中,第一焊接面2211可以与第二表面226间接连接,如图10、图11所示,第一焊接面2211和第二表面226之间通过第一过渡面227过渡连接,第一过渡面227可以是从倒角斜面,也可以是圆弧倒角面383。图11中示出了第一过渡面227为圆弧倒角面383的情况。
如图11所示,在一些实施例中,第一封堵件30包括第一表面31,第一表面31为第一封堵件30沿壁部的厚度方向X最远离所述电池单体的内部的表面,第一表面31与第二表面226平齐。
可以理解地,第一表面31和第二表面226共面,或者,沿壁部的厚度方向X,第一表面31和第二表面226距离电池单体20内部的同一位置的距离相同。
第一表面31和第二表面226平齐,则有利于减小电极端子22和第一封堵件30组成的整体结构沿壁部的厚度方向X的尺寸,从而减小电池单体20沿壁部的厚度方向X的尺寸。
在另一些实施例中,可以是第一表面31相对第二表面226更靠近电池单体20的内部,也可以是第二表面226相对第一表面31更靠近电池单体20的内部。
在一些实施例中,第一焊接面2211为第一锥面,沿壁部的厚度方向X,第一焊接面2211的大端较第一焊接面2211的小端更远离电池单体20的内部。
第一锥面的轴线的延伸方向可以与壁部的厚度方向X平行。
第一焊接面2211为第一锥面,第一焊接面2211的大端较第一焊接面2211的小端更远离电池单体20的内部,使得容纳槽221靠近电极端子22背离电池单体20内部的一侧的槽口的尺寸较大,便于第一封堵件30进入容纳槽221。
为了使在壁部的厚度方向X上,焊接间隙40沿背离电池单体20内部的方向逐渐增大,在第一焊接面2211为第一锥面的实施例中,如图12、图13所示,第二焊接面32可以是第二锥面,沿壁部的厚度方向X,第二焊接面32的小端较第二焊接面32的大端更远离电池单体20的内部,则第一锥面和第二锥面对应处形成沿背离电池单体20内部的方向逐渐增大的焊接间隙40,焊接间隙40的截面可以呈三角形。
当然,在第一焊接面2211为第一锥面的实施例中,如图12、图14所示,第二焊接面32也可以是圆柱面,第一锥面和圆柱面形式的第二焊接面32对应处形成沿背离电池单体20内部的方向逐渐增大的焊接间隙40,该焊接间隙40的截面可以呈直角三角形。
在一些实施例中,第一锥面可以是棱锥面。这种实施例中,第一锥面的大端和小端均为多边形,比如第一锥面的大端和小端均为三角形、四边形、五边形、六边形等。
在另一些实施例中,第一锥面为圆锥面。这种实施例中,第一锥面的大端和小端均为圆形,第一锥面的大端的直径大于第一锥面的小端的直径。圆锥面的轴线可以与安装孔2111的轴线重合,也可以不重合。
第一锥面为圆锥面,使得加工较为容易,且第一封堵件30进入容纳槽221内的过程中,圆锥面沿其周向的结构相同,则第一封堵件30相对容纳槽221的定位精度要求不高,便于第一封堵件30和电极端子22装配以及提高装配效率。
在另一些实施例中,第一焊接面2211也可以是圆柱面,该圆柱面的轴线的延伸方向与壁部的厚度方向X平行。
如图15所示,在一些实施例中,第一封堵件30包括第一表面31,第一表面31为第一封堵件30沿壁部的厚度方向X最远离电池单体20的内部的表面,第二焊接面32与第一表面31呈钝角设置。
参考直线所在平面与第二焊接面32的交线为第三交线Y3,参考直线所在平面与第一表面31的交线为第四交线Y4。第二焊接面32与第一表面31呈钝角设置,可以理解为,第三交线Y3和第四交线Y4呈钝角设置。
定义第二焊接面32和第一表面31的夹角为α,即第三交线Y3和第四交线Y4的夹角为α,也是90°<α<180°。比如α可以为100°、105°、110°、120°、130°、130°、140°、150°、160°等。
第二焊接面32与第一表面31呈钝角设置,有利于在背离电池单体20的内部一侧形成开口较大的焊接间隙40,从而方便焊枪进入焊接间隙40内,便于电极端子22和第一封堵件30焊接。
在另一些实施例中,第二焊接面32和第一表面31也可以垂直布置。即α=90°。
如图15所示,在一些实施例中,第二焊接面32连接第一表面31。
可以理解地,第二焊接面32与第一表面31直接相连。
第二焊接面32连接于第一表面31,使得焊接间隙40从第一表面31向靠近电池单体20的内部的方向延伸,使得焊接更加更方便。
在另一些实施例中,第二焊接面32可以与第一表面31间接连接,如图16所示,第二焊接面32和第一表面31之间通过第二过渡面33过渡连接,第二过渡面33可以是从倒角斜面,也可以是圆弧倒角面383。图16中示出了第二过渡面33为圆弧倒角面的情况。
如图15、图16所示,在一些实施例中,第二焊接面32为第二锥面,沿壁部的厚度方向X,第二焊接面32的小端较第二焊接面32的大端更远离电池单体20的内部。
第二锥面的轴线的延伸方向可以与壁部的厚度方向X平行。
第二锥面可以是棱锥面,也可以是圆锥面。
在第二锥面为棱锥面的实施例中,第二锥面的大端和小端均为多边形,比如第二锥面的大端和小端均为三角形、四边形、五边形、六边形等。
在第二锥面为圆锥面的实施例中,第二锥面的大端和小端均为圆形,第二锥面的大端的直径大于第二锥面的小端的直径。圆锥面的轴线可以与安装孔2111的轴线重合,也可以不重合。
第二焊接面32为第二锥面,第二焊接面32的小端较第二焊接面32的大端更远离电池单体20的内部,有利于形成开口较大的焊接间隙40,从而便于电极端子22和第一封堵件30焊接。
为了使在壁部的厚度方向X上,焊接间隙40沿背离电池单体20内部的方向逐渐增大,如图17、图18所示,在第二焊接面32为第二锥面的实施例中,第一焊接面2211也可以是圆柱面,第二锥面和圆柱面形式的第一焊接面2211对应处形成沿背离电池单体20内部的方向逐渐增大的焊接间隙40,该焊接间隙40的截面呈直角三角形。
当然,如图19、图20所示,2211在第二焊接面32为第二锥面的实施例中,第一焊接面2211可以是第 一锥面,沿壁部的厚度方向X,第一锥面的大端较第一锥面的小端更远离电池单体20的内部,则第一锥面和第二锥面对应处形成沿背离电池单体20内部的方向逐渐增大的焊接间隙40,焊接间隙40的截面为三角形。
如图20所示,在第二焊接面32为第二锥面的实施例中,第一焊接面2211为第一锥面,沿壁部的厚度方向X,第一焊接面2211的大端较第一焊接面2211的小端更远离电池单体20的内部;第一封堵件30还包括第三锥面34,第三锥面34与第一锥面相对设置,第三锥面34连接于第二锥面的大端。
第三锥面34的大端相对小端更远离电池单体20的内部。第三锥面34的大端和第二锥面的大端直接连接。
第一锥面的一部分与第二焊接对应设置形成焊接间隙40,第一锥面的另一部分与第三锥面34相对设置。第三锥面34与第二表面226的夹角为θ 1,θ 1和θ可以相同也可以不同。图20中示出,θ 1=θ的情况,以使第三锥面34与第一锥面能够更好的配合。
第一焊接面2211为第一锥面,第一焊接面2211的大端较第一焊接面2211的小端更远离电池单体20的内部,第二锥面和第一锥面的部分形成焊接间隙40,且在壁部的厚度方向X上,该焊接间隙40沿背离电池单体20内部的方向逐渐增大,则焊接间隙40靠近第一表面31的一端的尺寸较大,为焊枪提供较大的空间,从而方便焊枪进入焊接间隙40内,方便焊接。第三锥面34和第一锥面相对布置,能够使得第一封堵件30的形状与容纳槽221的形状更加贴合,便于装配。
在一些实施例中,第二锥面为圆锥面;和/或第三锥面34为圆锥面。
第二锥面和第三锥面34中的可以仅一者为圆锥面,比如第二锥面为圆锥面,第三锥面34为棱锥面,或者第三锥面34为圆锥面,第二锥面为棱锥面。第二锥面和第三锥面34也可以均为圆锥面。
在实际生产过程中,圆锥面更容易加工,且第二锥面和/或第三锥面34为圆锥面,则第一封堵件30进入容纳槽221内的过程中,圆锥面沿其周向的结构相同,使得第一封堵件30相对容纳槽221的定位精度要求不高,便于第一封堵件30和电极端子22装配以及提高装配效率。
如图21、图22所示,在第二焊接面32为第二锥面的实施例中,第一封堵件30还包括第一侧面35,第一侧面35连接于第二焊接面32的大端;容纳槽221的槽侧壁还包括第一侧壁面2212,沿壁部的厚度方向X,第一侧壁面2212相对第一焊接面2211更靠近电池单体20的内部,第一侧壁面2212连接于第一焊接面2211靠近电池单体20的内部的一端;第一侧壁面2212与第一侧面35相对布置,第一侧壁面2212和第一侧面35均为沿壁部的厚度方向X延伸的圆柱面。
沿壁部的厚度方向X,第一侧壁面2212与第一焊接面2211靠近电池单体20的内部的一端。在第一焊接面2211为第一锥面的实施例中,第一侧壁面2212与第一焊接面2211的小端直接连接。在第一锥面为圆锥面的实施例中,第一侧壁面2212的直径和第一锥面的小端的直径可以相同。
第一侧壁面2212和第一侧面35可以贴合,也可以存在间隙。
第一侧壁面2212和第一侧面35均为沿壁部的厚度方向X延伸的圆柱面,圆柱面加工更加容易。
如图20、图22所示,在一些实施例中,沿壁部的厚度方向X,焊接间隙40的最大尺寸为L,满足0.1mm≤L≤0.7mm。
在沿壁部的厚度方向X上,第一封堵件30全部容纳于容纳槽221内的实施例中,焊接间隙40沿壁部的厚度方向X的最大尺寸L为第二焊接面32沿壁部的厚度方向X上最远离电池单体20的内部的一端和最靠近电池单体20的内部的一端之间的距离。
在沿壁部的厚度方向X上,第一封堵件30一部分容纳于容纳槽221内的实施例中,焊接间隙40沿壁部的厚度方向X的最大尺寸L为第一焊接面2211沿壁部的厚度方向X上最远离电池单体20的内部的一端和第二焊接面32沿壁部的厚度方向X上最靠近电池单体20的内部的一端之间的距离。这种实施例中,焊接部50可以沿壁部的厚度方向X超出电极端子22的第二表面226,但是不能超出第一封堵件30的第一表面31。
L可以为0.1mm、0.15mm、0.2mm、0.25mm、0.3mm、0.35mm、0.45mm、0.5mm、0.55mm、0.6mm、0.65mm、0.7mm等。
若L>0.1mm,则沿壁部的厚度方向X,焊接间隙40的尺寸较小,为了使得焊接部50沿壁部的厚度方向X不超出第一表面31,则焊接部50在壁部的厚度方向X的尺寸也较小,可能导致焊接强度不足,若是L>0.7mm,则沿壁部的厚度方向X,焊接间隙40的尺寸较大,焊接难度增加。因此,0.1mm≤L≤0.7mm,使得焊接部50的尺寸能够满足对电极端子22和第一封堵件30的焊接强度要求,且使得焊接难度较小。
如图19-图22所示,在一些实施例中,第一封堵件30包括第一表面31,第一表面31为第一封堵件30沿壁部的厚度方向X最远离电池单体20的内部的表面,第一表面31还设有凹槽36,凹槽36围绕与壁部的厚度方向X平行的轴线设置。
凹槽36为围绕平行壁部的厚度方向X的轴线设置的环形槽。凹槽36的截面的形状可以是U形。
凹槽36的设置能够释放电极端子22和第一封堵件30焊接过程中的焊接应力,提高焊接质量以及缓解第一封堵件30和电极端子22在焊接过程中的变形,以及改善了第一封堵件30周向的焊接应力状态和降低焊接裂纹产生的风险。
如图23、图24,凹槽36为阶梯槽,凹槽36包括第一段361和第二段362,沿壁部的厚度方向X,第一段361相对第二段362更靠近第一表面31。第一段361延伸至第二焊接面32。第二段362从第一段361的槽底壁向背离第一表面31的方向凹陷。
结合参照图12、图19、图21、图23,在一些实施例中,容纳槽221为阶梯槽,容纳槽221包括相连的第一槽段2213和第二槽段2214,第一槽段2213较第二槽段2214更远离电池单体20的内部,第一封堵件30的至少一部分容纳于第一槽段2213,第一焊接面2211为第一槽段2213的槽侧壁的至少一部分。
沿壁部的厚度方向X,第一槽段2213的一端延伸至电极端子22的第二表面226。第二槽段2214从第一槽段2213的槽底壁向靠近电池单体20的内部凹陷。第一槽段2213和第二槽段2214的结构可以相同也可以不同,第一槽段2213和第二槽段2214可以为圆形槽、方形槽等。
第一封堵件30可以仅容纳于第一槽段2213内。第一封堵件30也可以部分容纳于第一槽段2213,另一部分延伸至第二槽段2214内。
如图19、图20所示,第一槽段2213的槽侧壁为第一焊接面2211,即第一焊接面2211为第一槽侧壁的全部。如图21、图22所示,在容纳槽221的槽侧壁包括第一焊接面2211和第一侧壁面2212的实施例中,第一焊接面2211和第一侧壁面2212共同形成第一槽段2213的槽侧壁,则第一焊接面2211为第一槽段2213的槽侧壁的一部分。
容纳槽221为阶梯槽,不仅能够减小电极端子22沿壁部的厚度方向X的尺寸,方便电极端子22和电池单体20内部的极耳61焊接,还能减轻电极端子22的重量,从而减轻电池单体20的重量。
在另一些实施例中,容纳槽221也可以仅包括第一槽段2213。
请继续参照图19、图21,在一些实施例中,第一封堵件30包括相连的本体部37和延伸部38,本体部37容纳于第一槽段2213并与第一槽段2213的槽底壁相抵,延伸部38从本体部37延伸至第二槽段2214内,第二焊接面32为本体部37的外周面的至少一部分。
第一表面31为本体部37沿壁部的厚度方向X最远离电池单体20的内部的表面。
如图19、图20所示,在第一封堵件30包括第二焊接面32和第三锥面34的实施例中,第二焊接面32和第三锥面34共同形成本体部37的外周面。如图21、图22所示,在第一封堵件30包括第二焊接面32和第一侧面35的实施例中,第二焊接面32和第一侧面35共同形成本体部37的外周面。
本体部37容纳于第一槽段2213并与第一槽段2213的槽底壁相抵,能够限制第一封堵件30在壁部的厚度方向X进一步向靠近电池单体20内部的方向移动,便于汇流部件和第一封堵件30电连接。延伸部38从本体部37延伸至第二槽段2214内,从第二槽段2214形成定位配合,有利于第一封堵件30和电极端子22保持稳定的相对位置关系。
在另一些实施例中,第一封堵件30也可以仅包括容纳于第一槽段2213的主体部。
结合参照图15、图16、图19、图21、图23,在一些实施例中,延伸部38包括第二侧面381和沿壁部的厚度方向X最靠近电池单体20的内部的第三表面382,第二侧面381和第三表面382通过倒角面383相连。
第二侧面381围绕与壁部的厚度方向X平行的轴线设置。第一侧面35与第二槽段2214的槽侧壁相对设置。第二侧面381可以是与第二槽段2214的槽侧壁相匹配的表面,比如第二槽段2214的槽侧壁为圆柱面,则第二侧面381可以为圆柱面;再比如,第二槽段2214的槽侧壁为棱柱面,则第二侧面381可以为棱柱面,示例性地,第二槽段2214的槽侧壁为六棱柱面,第二侧面381可以为六棱柱面。
第三表面382也是第二封堵件70沿壁部的厚度方向X最靠近电池单体20的内部的表面。
倒角面383可以是倒圆角面,也可以是导斜角面。15、图16、图19、图21、图23中均示出了倒角面383为倒角斜面。
第三表面382和第二侧面381通过倒角面383相连,倒角面383的设置不仅能够消除延伸部38端部的毛刺,还能在第一封堵件30进入容纳槽221的过程中起到导向的作用,以使第一封堵件30顺利进入容纳槽221。
如图25所示,在一些实施例中,第二槽段2214的槽侧壁与延伸部38的外周面间隔设置。
第二槽段2214和延伸部38间隙配合,第二槽段2214的槽侧壁和延伸部38的外周面之间存在距离。在本实施例中,第二槽段2214的槽侧壁和延伸部38的第二侧面381之间存在距离。
第二槽段2214的槽侧壁与延伸部38的外周面间隔设置,便于第一封堵件30和电极端子22装配。
请继续参照图25,在一些实施例中,第二槽段2214的槽侧壁与延伸部38的外周面之间的距离为h,0.03mm≤h≤0.1mm。
第二槽段2214的槽侧壁与延伸部38的外周面之间的距离h,也是第二槽段2214的槽侧壁和延伸部38的第二侧面381之间的距离。h可以为0.03mm、0.04mm、0.05mm、0.06mm、0.07mm、0.08mm、0.09mm、0.1mm等。
若h<0.03mm,则第二槽段2214的槽侧壁和延伸部38的外周面之间的距离太小难以控制,且对第一封堵件30和电极端子22的加工精度提出了更高的要求,加工难度更大,若h>0.1mm,第二槽段2214的槽侧壁和延伸部38的外周面之间的距离过大,在第一封堵件30和电极端子22焊接的过程中容易向一侧发生较大位移,使得焊接不均匀,影响焊接质量。因此,0.03mm≤h≤0.1mm,使得第二槽段2214的槽侧壁和延伸部38的外周面之间的距离在便于控制的范围之内,还使得电极端子22和第一封堵件30焊接过程中,第一封堵件30在第二槽段2214内移动的空间较小,从而提高焊接均匀性,有利于提高焊接质量。
如图25所示,在一些实施例中,沿壁部的厚度方向X,本体部37的尺寸为n,满足0.7mm≤n≤1.5mm。
本体部37沿壁部的厚度方向X的尺寸n是指,沿壁部的厚度方向X,第一表面31到本体部37与第一槽段2213的槽底壁相抵的表面之间的距离,也可以是第一表面31到第一槽段2213的槽底壁之间的距离。
n可以为0.7mm、0.8mm、0.9mm、1.0mm、1.1mm、1.2mm、1.3mm、1.4mm、1.5mm等。
若n<0.7mm,则本体部37的强度不足,不能满足实际使用要求,若n>1.5mm,则本体部37沿壁部的厚度方向X的尺寸太大,增大了电池单体20的尺寸。因此,0.7mm≤n≤1.5mm,既能使电池单体20沿壁部的厚度方向X的尺寸在合理的范围之内,还能保证本体部37的结构强度。
如图26所示,在一些实施例中,电极端子22设置有注液孔228,注液孔228连通容纳槽221和电池单体 20的内部。
在本实施例中,注液孔228设置于第二槽段2214的槽底壁,并贯穿第二槽段2214的槽底壁。在另一些实施例中,注液孔228也可以设置于容纳槽221的槽侧壁,比如,注液孔228设置于第二槽段2214的槽侧壁并延伸至第二抵靠部223背离连接部224的一侧。注液孔228用于供电解液进入外壳21内,具体而言,电解液进入容纳槽221后从注液孔228注入外壳21内。
注液孔228设置于电极端子22,使得加工更加方便,还能避免注液孔228设置在外壳21上影响外壳21的结构强度。
在焊接部50为环形结构的情况下,第一封堵件30能够起到封堵注液孔228的作用,降低电解液泄漏或者外部杂质经过容纳槽221和注液孔228进入外壳21内的风险。
在另一些实施例中,注液孔228也可以设置于壁部211。
如图27所示,在一些实施例中,电池单体20还包括第二封堵件70,第二封堵件70的至少一部分插设于注液孔228,以使封堵注液孔228。
第二封堵件70可以是橡胶钉。第二封堵件70插设于注液孔228内,注液孔228的孔壁可以使得第二封堵件70形变,从而使得第二封堵件70密封在注液孔228内。当然,注液孔228的孔壁也可以是与第二封堵件70的表面贴合,注液孔228的孔壁可以不使第二封堵件70变形。
第二封堵件70可以是一部分插设于注液孔228内,也可以是全部插设于注液孔228内。
第二封堵件70封堵注液孔228,能够降低电池单体20漏液的风险,还能降低第一封堵件30和电极端子22焊接过程中焊渣从注液孔228掉入电池单体20内部的风险。第二封堵件70还能起到一定的隔热作用,降低第一封堵件30和电极端子22焊接过程中高温对电池单体20内部结构和物质的损害。
第二封堵件70的结构形式有多种,比如,如图27所示,在一些实施例中,第二封堵件70包括封堵部71和限位部72,封堵部71插设于注液孔228,限位部72连接于封堵部71的一端并位于容纳槽221内,限位部72用于与容纳槽221的槽底壁相抵。
在注液孔228设置于第二槽段2214的槽底壁的实施例中,限位部72与容纳槽221的第二槽段2214的槽底壁相抵,限位部72位于第二槽段2214的槽底壁远离电池单体20的内部的一侧。
第二封堵件70的限位部72与容纳槽221的槽底壁相抵,能够现在第二封堵件70向电池单体20内部移动,降低第二封堵件70掉入电池单体20内部的风险。
请继续参照图27,在一些实施例中,第一封堵件30设有避让部39,避让部39用于容纳第二封堵件70的一部分。
第二封堵件70的一部分插入注液孔228,第二封堵件70的一部分位于容纳槽221内。避让部39为设置于第一封堵件30上的避让槽,第二封堵件70位于容纳槽221的部分容纳于避让部39内。在本实施例中,第二封堵件70的限位部72容纳于容纳槽221内,避让部39从第一封堵件30最靠近电池单体20内部的表面向背离电池单体20的内部的方向凹陷。限位部72的至少部分容纳于避让部39内。限位部72可以是部分容纳于避让部39内,也可以是全部容纳于避让部39内。在注液孔228设置于第二槽段2214的槽底壁的实施例中,在第二封堵件70一部分容纳于避让部39的情况下,沿壁部的厚度方向X,第一封堵件30最靠近电池单体20内部的表面(第三表面382)和第二槽段2214的槽底壁可以抵接,也可以间隔设置。
避让部39的设置能够降低第二封堵件70和第一封堵件30干涉的风险。避让部39容纳第二封堵件70的一部分,即第二封堵件70的一部分嵌入到第一封堵件30中,有利于减小第一封堵件30和第二封堵件70形成的整体结构的尺寸。
在另一些实施例中,第一封堵件30也可以不设置避让部39,沿壁部的厚度方向X,第一封堵件30最靠近电池单体20内部的表面(第三表面382)可以与第二封堵件70最远离电池单体20内部的表面相抵或者间隔设置。比如,第一封堵件30的第三表面382和限位部72背离封堵部71的表面相抵或者间隔设置。
本申请实施例还提供一种电池100,包括上述任意实施例提供的电池单体20。
电池100可以包括多个电池单体20,多个电池单体20通过汇流部件串联、并联或者混联。汇流部件与电池单体20的第一封堵件30的第一表面31焊接连接。
第一方面实施例中的电池单体20的电极端子22和第一封堵件30焊接的焊接部50不超出第一封堵件30的第一表面31,则在汇流部件与第一表面31连接(比如焊接)时,焊接部50不会干涉汇流部件,使得汇流部件和第一表面31形成稳定的连接关系,从而使得第一封堵件30和汇流部件之间形成稳定的电连接关系,有利于提高电池100输出电能的稳定性。
本申请实施例还提供一种用电设备,用电设备包括上述实施例提供的电池100。
电池100为用电设备提供电能,以使用电设备能够正常执行其功能。
上述实施例提供的电池100能够稳定的输出电能,从而保证用电设备能够稳定的工作。
本申请实施例提供一种圆柱电池,圆柱电池包括外壳21、电极端子22、第一封堵件30、电极组件60和第二封堵件70。电极端子22绝缘设置于外壳21的壁部211,电极端子22用于与电极组件60的极耳61电连接。沿壁部的厚度方向X,电极端子22最远离电池单体20的内部的第二表面226上设有容纳槽221,容纳槽221为阶梯槽,容纳槽221包括第一槽段2213和第二槽,第一槽段2213相对第二槽段2214更加远离电池单体20的内部。第一焊接面2211为第一槽段2213的槽侧壁,第一焊接面2211为圆锥面,第一焊接面2211的大端与第二表面226相连,第一焊接面2211的小端与第一槽段2213的槽底壁相连。第一封堵件30包括相连的本体部37和延伸部38,本体部37容纳于第一槽段2213内,本体部37与延伸部38相连的表面与第一槽段2213的槽底壁相抵,延伸部38延伸至第二槽段2214内。沿壁部的厚度方向X,本体部37最远离电池单体20内部的第一表面31用于与汇流部件焊 接连接。本体部37的外周面包括第二焊接面32和第三锥面34,第二焊接面32和第三锥面34均为圆锥面,第二焊接面32的小端与第一表面31直接连接或者间接连接,第二焊接面32的大端与第三锥面34的大端连接,第一焊接面2211的一部分和第二焊接面32之间形成焊接间隙40,电极端子22和第一封堵件30焊接连接并形成位于焊接间隙40内的焊接部50,焊接部50连接第一焊接面2211和第二焊接面32,沿壁部的厚度方向X,焊接部50不超出第一表面31,第一焊接面2211的另一部分与第三锥面34相对布置。沿壁部的厚度方向X,延伸部38背离本体部37的第三表面382和延伸部38的外周面(第二侧面381)通过倒角面383连接。第二槽段2214的槽底壁设有注液孔228,第二封堵件70的封堵部71插设于注液孔228内,第二封堵件70的限位部72连接于封堵部71的一端并位于第二槽段2214内,限位部72与第二槽段2214的槽底壁相抵。延伸部38的第三表面382设有避让部39,限位部72的至少部分容纳于避让部39内。
本申请实施例提供一种圆柱电池,圆柱电池包括外壳21、电极端子22、第一封堵件30、电极组件60和第二封堵件70。电极端子22绝缘设置于外壳21的壁部211,电极端子22用于与电极组件60的极耳61电连接。沿壁部的厚度方向X,电极端子22最远离电池单体20的内部的第二表面226上设有容纳槽221,容纳槽221为阶梯槽,容纳槽221包括第一槽段2213和第二槽,第一槽段2213相对第二槽段2214更加远离电池单体20的内部。第一槽段2213的槽侧壁包括第一焊接面2211和第一侧壁面2212,第一焊接面2211为圆锥面,第二侧壁面面为圆柱面,第一焊接面2211的大端与第二表面226相连,第一焊接面2211的小端与第一侧壁面2212相连,第一侧壁面2212背离第一焊接面2211的一端与第一槽段2213的槽底壁相连。第一封堵件30包括相连的本体部37和延伸部38,本体部37容纳于第一槽段2213内,本体部37与延伸部38相连的表面与第一槽段2213的槽底壁相抵,延伸部38延伸至第二槽段2214内。沿壁部的厚度方向X,本体部37最远离电池单体20内部的第一表面31用于与汇流部件焊接连接。本体部37的外周面包括第二焊接面32和第一侧面35,第二焊接面32为圆锥面,第二侧面381为圆柱面,第二焊接面32的小端与第一表面31直接连接或者间接连接,第二焊接面32的大端与第一侧面35连接,第一侧面35和第一侧壁面2212相对布置。第一焊接面2211的一部分和第二焊接面32之间形成焊接间隙40,电极端子22和第一封堵件30焊接连接并形成位于焊接间隙40内的焊接部50,焊接部50连接第一焊接面2211和第二焊接面32,沿壁部的厚度方向X,焊接部50不超出第一表面31,第一焊接面2211的另一部分与第三锥面34相对布置。沿壁部的厚度方向X,延伸部38背离本体部37的第三表面382和延伸部38的外周面(第二侧面381)通过倒角面383连接。第二槽段2214的槽底壁设有注液孔228,第二封堵件70的封堵部71插设于注液孔228内,第二封堵件70的限位部72连接于封堵部71的一端并位于第二槽段2214内,限位部72与第二槽段2214的槽底壁相抵。延伸部38的第三表面382设有避让部39,限位部72的至少部分容纳于避让部39内。
以上仅为本申请的优选实施例而已,并不用于限制本申请,对于本领域的技术人员来说,本申请可以有各种更改和变化。凡在本申请的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本申请的保护范围之内。

Claims (29)

  1. 一种电池单体,包括:
    外壳,包括壁部;
    电极端子,设置于所述壁部,所述电极端子沿所述壁部的厚度方向背离所述电池单体内部的表面设有容纳槽,所述容纳槽的槽侧壁包括第一焊接面;
    第一封堵件,至少部分容纳于所述容纳槽内,所述第一封堵件包括第二焊接面,所述第二焊接面与所述第一焊接面之间形成焊接间隙,所述第一封堵件与所述电极端子焊接,并形成焊接部,所述焊接部连接所述第一焊接面和所述第二焊接面,并至少部分位于所述焊接间隙内。
  2. 根据权利要求1所述的电池单体,其中,所述第一封堵件包括第一表面,所述第一表面为所述第一封堵件沿所述壁部的厚度方向最远离所述电池单体的内部的表面,所述焊接部不超出第一表面。
  3. 根据权利要求1或2所述的电池单体,其中,在所述壁部的厚度方向上,所述焊接间隙沿背离所述电池单体内部的方向逐渐增大。
  4. 根据权利要求2或3所述的电池单体,其中,沿所述壁部的厚度方向,所述电极端子具有最远离所述电池单体的内部的第二表面,所述容纳槽从所述第二表面向靠近所述电池单体的内部的方向凹陷,所述第一焊接面与所述第二表面呈钝角设置。
  5. 根据权利要求4所述的电池单体,其中,所述第一焊接面与所述第二表面的夹角为θ,满足110°≤θ≤160°。
  6. 根据权利要求4或5所述的电池单体,其中,所述第一焊接面连接于所述第二表面。
  7. 根据权利要求4-6任一项所述的电池单体,其中,所述第一封堵件包括第一表面,所述第一表面为所述第一封堵件沿所述壁部的厚度方向最远离所述电池单体的内部的表面,所述第一表面与所述第二表面平齐。
  8. 根据权利要求1-7任一项所述的电池单体,其中,所述第一焊接面为第一锥面,沿所述壁部的厚度方向,所述第一焊接面的大端较所述第一焊接面的小端更远离所述电池单体的内部。
  9. 根据权利要求8所述的电池单体,其中,所述第一锥面为圆锥面。
  10. 根据权利要求1-9任一项所述的电池单体,其中,所述第一封堵件包括第一表面,所述第一表面为所述第一封堵件沿所述壁部的厚度方向最远离所述电池单体的内部的表面,所述第二焊接面与所述第一表面呈钝角设置。
  11. 根据权利要求10所述的电池单体,其中,所述第二焊接面连接所述第一表面。
  12. 根据权利要求1-11任一项所述的电池单体,其中,所述第二焊接面为第二锥面,沿所述壁部的厚度方向,所述第二焊接面的小端较所述第二焊接面的大端更远离所述电池单体的内部。
  13. 根据权利要求12所述的电池单体,其中,所述第一焊接面为第一锥面,沿所述壁部的厚度方向,所述第一焊接面的大端较所述第一焊接面的小端更远离所述电池单体的内部;
    所述第一封堵件还包括第三锥面,所述第三锥面与所述第一锥面相对设置,所述第三锥面连接于所述第二锥面的大端。
  14. 根据权利要求13所述的电池单体,其中,所述第二锥面为圆锥面;和/或所述第三锥面为圆锥面。
  15. 根据权利要求12所述的电池单体,其中,所述第一封堵件还包括第一侧面,所述第一侧面连接于所述第二焊接面的大端;
    所述容纳槽的槽侧壁还包括第一侧壁面,沿所述壁部的厚度方向,所述第一侧壁面相对所述第一焊接面更靠近所述电池单体的内部,所述第一侧壁面连接于所述第一焊接面靠近所述电池单体的内部的一端;
    所述第一侧壁面与所述第一侧面相对布置,所述第一侧壁面和所述第一侧面均为沿所述壁部的厚度方向延伸的圆柱面。
  16. 根据权利要求1-15任一项所述的电池单体,其中,沿所述壁部的厚度方向,所述焊接间隙的最大尺寸为L,满足0.1mm≤L≤0.7mm。
  17. 根据权利要求2-16任一项所述的电池单体,其中,所述第一封堵件包括第一表面,所述第一表面为所述第一封堵件沿所述壁部的厚度方向最远离所述电池单体的内部的表面,所述第一表面还设有凹槽,所述凹槽围绕与所述壁部的厚度方向平行的轴线设置。
  18. 根据权利要求1-17任一项所述的电池单体,其中,所述容纳槽为阶梯槽,所述容纳槽包括相连的第一槽段和第二槽段,所述第一槽段较所述第二槽段更远离所述电池单体的内部,所述第一封堵件的至少一部分容纳于所述第一槽段,所述第一焊接面为所述第一槽段的槽侧壁的至少一部分。
  19. 根据权利要求18所述的电池单体,其中,所述第一封堵件包括相连的本体部和延伸部,所述本体部容纳于所述第一槽段并与所述第一槽段的槽底壁相抵,所述延伸部从所述本体部延伸至所述第二槽段内,所述第二焊接面为所述本体部的外周面的至少一部分。
  20. 根据权利要求19所述的电池单体,其中,所述延伸部包括第二侧面和沿所述壁部的厚度方向最靠近所述电池单体的内部的第三表面,所述第二侧面和所述第三表面通过倒角面相连。
  21. 根据权利要求19或20所述的电池单体,其中,所述第二槽段的槽侧壁与所述延伸部的外周面间隔设置。
  22. 根据权利要求21所述的电池单体,其中,所述第二槽段的槽侧壁与所述延伸部的外周面之间的距离为h,0.03mm≤h≤0.1mm。
  23. 根据权利要求19-22任一项所述的电池单体,其中,沿所述壁部的厚度方向,所述本体部的尺寸为n,满足0.7mm≤n≤1.5mm。
  24. 根据权利要求1-23任一项所述的电池单体,其中,所述电极端子设置有注液孔,所述注液孔连通所述容纳槽和所述电池单体的内部。
  25. 根据权利要求24所述的电池单体,其中,所述电池单体还包括第二封堵件,所述第二封堵件的至少一部分插设于所述注液孔,以使封堵所述注液孔。
  26. 根据权利要求25所述的电池单体,其中,所述第二封堵件包括封堵部和限位部,所述封堵部插设于所述注液孔,所述限位部连接于所述封堵部的一端并位于所述容纳槽内,所述限位部用于与所述容纳槽的槽底壁相抵。
  27. 根据权利要求25或26所述的电池单体,其中,所述第一封堵件设有避让部,所述避让部用于容纳所述第二封堵件的一部分。
  28. 一种电池,包括根据权利要求1-27任一项所述的电池单体。
  29. 一种用电设备,包括根据权利要求28所述的电池。
PCT/CN2022/132976 2022-11-18 2022-11-18 电池单体、电池及用电设备 WO2024103405A1 (zh)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013093287A (ja) * 2011-10-27 2013-05-16 Hitachi Vehicle Energy Ltd 単電池および組電池
CN215989122U (zh) * 2021-09-30 2022-03-08 宁德时代新能源科技股份有限公司 电池单体、电池、用电设备及电池单体的制造设备
CN216720089U (zh) * 2022-01-14 2022-06-10 宁德时代新能源科技股份有限公司 电池单体、电池及用电设备
CN217158556U (zh) * 2022-04-29 2022-08-09 宁德时代新能源科技股份有限公司 电池单体、电池及用电设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013093287A (ja) * 2011-10-27 2013-05-16 Hitachi Vehicle Energy Ltd 単電池および組電池
CN215989122U (zh) * 2021-09-30 2022-03-08 宁德时代新能源科技股份有限公司 电池单体、电池、用电设备及电池单体的制造设备
CN216720089U (zh) * 2022-01-14 2022-06-10 宁德时代新能源科技股份有限公司 电池单体、电池及用电设备
CN217158556U (zh) * 2022-04-29 2022-08-09 宁德时代新能源科技股份有限公司 电池单体、电池及用电设备

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