WO2024082097A1 - 电池单体、电池和用电设备 - Google Patents

电池单体、电池和用电设备 Download PDF

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Publication number
WO2024082097A1
WO2024082097A1 PCT/CN2022/125691 CN2022125691W WO2024082097A1 WO 2024082097 A1 WO2024082097 A1 WO 2024082097A1 CN 2022125691 W CN2022125691 W CN 2022125691W WO 2024082097 A1 WO2024082097 A1 WO 2024082097A1
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Prior art keywords
battery cell
side wall
electrode terminal
protruding
height
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PCT/CN2022/125691
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English (en)
French (fr)
Inventor
王利钦
李全坤
马云建
喻鸿钢
赵佩杰
丁宇
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/CN2022/125691 priority Critical patent/WO2024082097A1/zh
Publication of WO2024082097A1 publication Critical patent/WO2024082097A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular

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, which can improve the processing efficiency of the battery cell.
  • a battery cell comprising: a shell, which is a hollow structure with an opening, and a first side wall of the shell adjacent to the opening is provided with an electrode terminal; a cover plate, used to cover the opening, the cover plate and the shell are sealed and connected to form a connection structure around the opening, the connection structure includes a first area corresponding to the electrode terminal, and the orthographic projection of a portion of the electrode terminal protruding from the outer surface of the first side wall on the connection structure does not exceed the first area.
  • the welding seal can be performed along the edge of the first area away from the interior of the battery cell, or along the edge of the first area away from the electrode terminal. Since the first area is large in scope, it will not be affected or will hardly be affected by the electrode terminal with a relatively small scope, and it will hardly affect the electrode terminal, thereby improving the sealing efficiency, ensuring the sealing reliability, and improving the processing efficiency and safety performance of the battery cell.
  • the height of the first region protruding from the outer surface of the first side wall is greater than the height of the electrode terminal protruding from the outer surface of the first side wall. In this way, when the shell and the cover plate of the battery cell are sealed, for example, when they are sealed by welding, welding and sealing can be performed along the edge of the first region away from the inside of the battery cell. Since the height of the first region is not equal to the height of the electrode terminal, that is, the height of the first region is larger, there is a height difference between the outer edge of the connection structure perpendicular to the height direction of the first region and the corresponding outer edge of the electrode terminal.
  • the sealed connection between the shell and the cover plate in this area will not be affected or will hardly be affected by the electrode terminal with a relatively small height, and it is also difficult to affect the electrode terminal, thereby improving the sealing efficiency, ensuring the sealing reliability, and improving the processing efficiency and safety performance of the battery cell.
  • the difference between the height of the first region protruding from the outer surface of the first side wall and the height of the electrode terminal protruding from the outer surface of the first side wall is in the range of [0.5 mm, 2 mm].
  • the height difference is set too large, since the height of the electrode terminal protruding from the outer surface of the first side wall is relatively fixed, the height of the first area protruding from the outer surface of the first side wall is relatively large, which will cause the local height of the battery cell to be too high, which will affect the assembly of multiple battery cells inside the battery and reduce the space utilization of the battery.
  • the height difference is set too small, that is, the height of the first area protruding from the outer surface of the first side wall is similar to the height of the electrode terminal protruding from the outer surface of the first side wall, then even if the edge of the first area far from the inside of the battery cell is sealed to connect the shell and the cover plate, it is still easily affected by the electrode terminal, which will affect the sealing reliability and further affect the processing efficiency of the battery cell.
  • the length of the first region in the length direction of the first region, is greater than the length of the electrode terminal, and the length direction is perpendicular to the thickness direction of the first region and the height direction of the first region protruding from the outer surface of the first side wall.
  • the welding seal can be performed along the edge of the first region away from the inside of the battery cell. Since the length of the first region is not equal to the length of the electrode terminal, that is, the length of the first region is larger, there is a length difference between the outer edge of the connection structure perpendicular to the length direction of the first region and the corresponding outer edge of the electrode terminal, and the sealed connection between the shell and the cover in this region will not be affected or will hardly be affected by the electrode terminal with a relatively small height, and it is also difficult to affect the electrode terminal, thereby improving the sealing efficiency, ensuring the sealing reliability, and improving the processing efficiency and safety performance of the battery cell.
  • the minimum distance between the edge of the first region and the orthographic projection is in the range of [0.5 mm, 5 mm].
  • the distance is set too large, since the length of the electrode terminal is relatively fixed, the length of the first area is too large, which will cause the protruding first area to occupy a large space, which is likely to affect the assembly of multiple battery cells inside the battery and reduce the space utilization of the battery.
  • the distance is set too small, the distance between the edge of the electrode terminal and the edge of the first area is small, so even if the outer edge of the first area away from the electrode terminal is sealed to the shell and the cover plate, it is still easily affected by the electrode terminal, which will affect the sealing reliability and further affect the processing efficiency of the battery cell.
  • the first side wall is provided with a plurality of the electrode terminals
  • the connection structure includes a plurality of the first regions corresponding to the plurality of the electrode terminals one by one.
  • connection structure includes a second region corresponding to the first side wall, the height of the second region protruding from the outer surface of the first side wall is greater than the height of the electrode terminal protruding from the outer surface of the first side wall, and the second region includes the first region.
  • the electrode terminal is a positive electrode terminal.
  • the positive electrode terminal is set to correspond to the first area, and the first area is not set to correspond to the negative electrode terminal, which can also effectively avoid the positive electrode terminal from affecting the sealing connection between the housing and the cover plate.
  • the housing has a plurality of the first side walls, so that the electrode terminal disposed on each first side wall has a corresponding first area, so as to improve the sealing reliability between the housing and the cover plate.
  • the shell includes a second side wall adjacent to the opening, the second side wall is not provided with an electrode terminal, and the connecting structure includes a third area corresponding to the second side wall, and the height of the third area protruding from the outer surface of the second side wall is not equal to the height of the first area protruding from the outer surface of the first side wall.
  • the setting of the third area does not need to consider the influence of the electrode terminal. For example, if the third area does not need to avoid other components, the height of the third area protruding from the outer surface of the second side wall can be reduced to reduce the space occupied by the third area. On the contrary, if the third area still needs to avoid other components, the height of the third area protruding from the outer surface of the second side wall can be appropriately increased or reduced to avoid the influence of other components on the connection structure, thereby improving the sealing reliability between the shell and the cover plate.
  • the height of the third region protruding from the outer surface of the second side wall is less than the height of the first region protruding from the outer surface of the first side wall.
  • the battery cell also includes: an insulating structure, which is arranged on a side of the first side wall facing the interior of the battery cell, the first side wall is provided with a first through hole, and the insulating structure is provided with a second through hole corresponding to the first through hole, and the electrode terminal passes through the first through hole and the second through hole so that the first side wall and the insulating structure are riveted, which facilitates processing and fixation between the electrode terminal, the first side wall and the insulating structure.
  • an insulating structure which is arranged on a side of the first side wall facing the interior of the battery cell, the first side wall is provided with a first through hole, and the insulating structure is provided with a second through hole corresponding to the first through hole, and the electrode terminal passes through the first through hole and the second through hole so that the first side wall and the insulating structure are riveted, which facilitates processing and fixation between the electrode terminal, the first side wall and the insulating structure.
  • the battery cell further comprises: a sealing structure disposed on a side of the first side wall away from the interior of the battery cell, the sealing structure being used to electrically isolate the electrode terminal from the first side wall.
  • the sealing structure is generally made of insulating material, and the sealing structure is disposed between the first side wall and the electrode terminal to prevent a short circuit between the electrode terminal and the first side wall.
  • the sealing structure is provided with a fifth through hole, at least a portion of the fifth through hole is accommodated in the first through hole, and the electrode terminal passes through the fifth through hole to seal between the electrode terminal and the first through hole.
  • the first side wall is provided with a first through hole and the insulating structure is provided with a second through hole, there may be gaps between the electrode terminal and the first through hole and between the electrode terminal and the second through hole, so the first through hole and the second through hole can be sealed by the sealing structure.
  • the sealing structure can be squeezed and deformed and then sealed to avoid leakage of internal electrolyte.
  • the first side wall is provided with a first limiting structure
  • the insulating structure is provided with a second limiting structure corresponding to the first limiting structure
  • the second limiting structure and the first limiting structure cooperate with each other to prevent relative movement between the insulating structure and the first side wall.
  • the first side wall and the insulating structure can be positioned to facilitate installation therebetween; on the other hand, misalignment between the first side wall and the insulating structure can be avoided. For example, relative translation between the first side wall and the insulating structure can be avoided, thereby ensuring the insulation performance of the insulating structure between the first side wall and other components inside the battery cell, avoiding short circuits, and improving the safety performance of the battery cell.
  • the battery cell also includes: a connecting member for electrically connecting to the electrode terminal, the connecting member being arranged on a side of the insulating structure facing the interior of the battery cell, the connecting member being provided with a third through hole corresponding to the second through hole, the electrode terminal passing through the third through hole so that the connecting member, the insulating structure and the first side wall are riveted.
  • the connecting member is provided with a third through hole, and the first through hole of the first side wall, the second through hole of the insulating structure and the third through hole of the connecting member are stacked in sequence, so that the electrode terminal can pass through the first through hole, the second through hole and the third through hole in sequence, thereby realizing riveting fixation between the first side wall, the insulating structure and the connecting member.
  • the processing process is simple, which is conducive to improving the processing efficiency of the battery cell.
  • the connecting member further includes a third limiting structure, and the third limiting structure cooperates with the second limiting structure to prevent relative movement between the connecting member and the insulating structure.
  • the first limiting structure, the second limiting structure and the third limiting structure can cooperate with each other to prevent relative movement between the first side wall, the insulating structure and the connecting member, and can fix the connecting member to facilitate the combined installation of the battery cells. It can also ensure that the insulating structure electrically isolates the first side wall and the connecting member to avoid a short circuit between the connecting member and the first side wall.
  • the cover plate is the wall with the largest area of the battery cell, which facilitates the installation of components inside the battery cell, for example, can facilitate the installation of the electrode assembly and speed up the processing of the battery cell.
  • the cover plate is provided with a pressure relief mechanism; or, a pressure relief mechanism is provided on a wall arranged opposite to the cover plate, so as to be actuated to release the internal pressure or temperature of the battery cell when the internal pressure or temperature of the battery cell reaches a predetermined threshold.
  • the pressure relief mechanism is an L-shaped notch provided on the outer surface of the battery cell, that is, the pressure relief mechanism has two parts connected to each other and perpendicular to each other, so that when the temperature or pressure inside the battery cell reaches a preset threshold, the pressure relief mechanism can be destroyed in any direction, so that the pressure relief mechanism can be destroyed in time, and the pressure and temperature inside the battery cell can be released in time to avoid the explosion of the battery cell.
  • the pressure relief mechanism is provided on the outer surface of the cover plate to prevent the electrolyte inside the battery cell from accumulating in the notch and to prevent the electrolyte from corroding the pressure relief mechanism, thereby also improving the safety of the pressure relief mechanism.
  • the material of the housing includes stainless steel and/or an alloy; and/or the material of the cover plate includes stainless steel and/or an alloy. This can make the battery cell have a stronger hardness and ensure the structural strength of the battery cell.
  • the thickness of the shell is in the range of [50 ⁇ m, 200 ⁇ m]; and/or the thickness of the cover plate is in the range of [50 ⁇ m, 200 ⁇ m], so as to ensure the structural strength of the battery cell.
  • a battery comprising: a plurality of battery cells as described in the first aspect.
  • an electrical device comprising: the battery cell described in the first aspect, wherein the battery cell is used to provide electrical energy to the electrical device.
  • the electrical equipment is a vehicle, a ship or a spacecraft.
  • FIG1 is a schematic structural diagram of a vehicle disclosed in an embodiment of the present application.
  • FIG2 is a schematic diagram of an exploded structure of a battery disclosed in an embodiment of the present application.
  • FIG3 is a schematic diagram of the structure of a battery cell disclosed in an embodiment of the present application.
  • FIG4 is a schematic diagram of an exploded structure of a battery cell disclosed in an embodiment of the present application.
  • FIG5 is a partial side view schematic diagram of a battery cell disclosed in an embodiment of the present application.
  • FIG6 is a schematic diagram of the structure of another battery cell disclosed in an embodiment of the present application.
  • FIG7 is a schematic diagram of the structure of another battery cell disclosed in an embodiment of the present application.
  • FIG8 is a schematic side view of another battery cell disclosed in an embodiment of the present application.
  • FIG9 is a schematic diagram of the structure of a battery cell before cutting disclosed in an embodiment of the present application.
  • FIG10 is a partial cross-sectional schematic diagram of a battery cell disclosed in an embodiment of the present application.
  • FIG11 is another partial cross-sectional schematic diagram of a battery cell disclosed in one embodiment of the present application.
  • FIG12 is a partial cross-sectional exploded schematic diagram of a battery cell disclosed in an embodiment of the present application.
  • FIG13 is a schematic diagram of an outer surface of a first wall of a battery cell disclosed in an embodiment of the present application.
  • FIG14 is a schematic diagram of a surface of a cover plate disclosed in an embodiment of the present application.
  • FIG. 15 is a partial cross-sectional schematic diagram of a cover plate disclosed in an embodiment of the present application.
  • 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 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.
  • the battery cell includes an electrode assembly and an electrolyte.
  • the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator.
  • the battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.
  • the positive electrode sheet includes a positive electrode collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode collector.
  • the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer.
  • the positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab.
  • the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.
  • the negative electrode sheet includes a negative electrode collector and a negative electrode active material layer.
  • the negative electrode active material layer is coated on the surface of the negative electrode collector.
  • the negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer.
  • the negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab.
  • the material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc.
  • the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.
  • the material of the isolation film may be polypropylene (PP) or polyethylene (PE), etc.
  • the electrode assembly may be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.
  • a battery cell usually includes a shell with an opening and a cover plate for covering the opening, wherein the shell and the cover plate can be sealed and connected by welding.
  • the area where the shell and the cover plate of the battery cell are sealed and connected usually protrudes from the outer surface of the cover plate and the shell, and the height of the protruding part is relatively small; in addition, the electrode terminals and other components provided on the battery cell may also protrude from the surface of the shell or the cover plate.
  • the shell and the cover plate When welding the shell and the cover plate, it is likely to affect the protruding electrode terminals or other components. For example, when the shell and the cover plate are sealed by laser welding, there may be interference with the electrode terminals, which affects the operability and quality rate of laser welding, thereby increasing the manufacturing cost, and even affecting the sealing of the battery cell, thereby affecting the qualified rate and processing efficiency of the battery cell.
  • the embodiment of the present application provides a battery cell, a battery and an electrical device, wherein the shell and the cover plate of the battery cell are sealed and connected to form a connection structure surrounding the opening of the shell.
  • the connection structure includes a first area corresponding to the electrode terminal located on the first side wall of the shell, and the portion of the electrode terminal protruding from the outer surface of the first side wall does not exceed the first area in the orthographic projection of the connection structure, that is, the range of the first area is greater than or equal to the range of the orthographic projection.
  • the range of the first area is large, it will not be affected or is difficult to be affected by the relatively small electrode terminal, and it is also difficult to affect the electrode terminal, thereby improving the sealing efficiency, ensuring the sealing reliability, and improving the processing efficiency and safety performance of the battery cell.
  • FIG1 it is a schematic diagram of the structure of a vehicle 1 according to an embodiment of the present application.
  • the vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle.
  • the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • a motor 40, a controller 30 and a battery 10 may be provided inside the vehicle 1.
  • the controller 30 is used to control the battery 10 to supply power to the motor 40.
  • a battery 10 may be provided at the bottom, front or rear of the vehicle 1.
  • the battery 10 may be used to supply power to the vehicle 1.
  • the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1.
  • the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.
  • a battery may include multiple battery cells, wherein multiple battery cells may be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series and parallel connection.
  • a battery may also be referred to as a battery pack.
  • multiple battery cells may be connected in series, in parallel, or in hybrid connection to form a battery module, and multiple battery modules may be connected in series, in parallel, or in hybrid connection to form a battery.
  • multiple battery cells may be directly connected to form a battery, or they may be first connected to form a battery module, and then the battery module may be connected to form a battery.
  • FIG. 2 shows a schematic diagram of the structure of a battery 10 according to an embodiment of the present application, and the battery 10 may include a plurality of battery cells 20.
  • the battery 10 may also include a box 11, the interior of the box 11 is a hollow structure, and a plurality of battery cells 20 are accommodated in the box 11.
  • FIG. 2 shows a possible implementation of the box 11 of the embodiment of the present application.
  • the box 11 may include two parts, which are respectively referred to as a first part 111 and a second part 112, and the first part 111 and the second part 112 are buckled together.
  • the shape of the first part 111 and the second part 112 can be determined according to the shape of the plurality of battery cells 20 after combination, and at least one of the first part 111 and the second part 112 has an opening.
  • the first part 111 and the second part 112 may both be hollow cuboids and each have only one face as an opening face, the opening of the first part 111 and the opening of the second part 112 are arranged opposite to each other, and the first part 111 and the second part 112 are buckled together to form a box 11 with a closed chamber.
  • first part 111 and the second part 112 may be a hollow cuboid with an opening, while the other may be in the shape of a plate to cover the opening.
  • the second part 112 is a hollow cuboid with only one face being an opening face, and the first part 111 is in the shape of a plate. Then, the first part 111 covers the opening of the second part 112 to form a box 11 with a closed chamber, which can be used to accommodate a plurality of battery cells 20.
  • the plurality of battery cells 20 are connected in parallel, in series, or in a mixed combination and placed in the box 11 formed by the first part 111 and the second part 112 being buckled together.
  • the battery 10 may also include other structures, which are not described one by one here.
  • the battery 10 may also include a busbar, which is used to realize the electrical connection between multiple battery cells 20, such as parallel or series or mixed connection.
  • the busbar can realize the electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20.
  • the busbar can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of multiple battery cells 20 can be further led out through the box 11 through the conductive mechanism.
  • the number of battery cells 20 in the battery 10 can be set to any value. Multiple battery cells 20 can be connected in series, parallel or mixed to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, for ease of installation, the battery cells 20 can be grouped, and each group of battery cells 20 constitutes a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to demand. In addition, in order to increase the space occupancy rate of the battery cells 20 in the battery 10, the installation direction of the battery cells 20 can be reasonably set according to the shape of the multiple battery cells 20; and, the installation directions of different battery cells 20 in the battery 10 can be the same or different, and the embodiments of the present application are not limited to this.
  • Figure 3 shows a schematic diagram of the structure of a battery cell 20 according to an embodiment of the present application
  • Figure 4 shows a schematic diagram of the decomposed structure of the battery cell 20 according to an embodiment of the present application, for example, Figure 4 may be a schematic diagram of the decomposed structure of the battery cell 20 shown in Figure 3
  • Figure 5 shows a schematic diagram of the local structure of one side of the battery cell 20 according to an embodiment of the present application, for example, Figure 5 is a schematic diagram of the local structure of one side of the bottom wall of the shell 211 of the battery cell 20 shown in Figure 3.
  • a shell 211 is a hollow structure with an opening 2111, and a first side wall 2112 of the shell 211 adjacent to the opening 2111 is provided with an electrode terminal 214; a cover plate 212 is used to cover the opening 2111, and the cover plate 212 and the shell 211 are sealed and connected to form a connection structure 216 surrounding the opening 2111, and the connection structure 216 includes a first area 2161 corresponding to the electrode terminal 214, and the orthographic projection of the portion of the electrode terminal 214 protruding from the outer surface of the first side wall 2112 on the connection structure 216 does not exceed the first area 2161.
  • the battery cell 20 of the embodiment of the present application includes a shell 21, and the shell 21 can be a polyhedral hollow structure, which can be used to accommodate the electrode assembly.
  • the shape of the battery cell 20 can be flexibly set according to the actual application, that is, the battery cell 20 can be any polyhedral structure, for example, it can be set to a rectangular parallelepiped or a cylinder.
  • the battery cell 20 may include a shell 21, and the shell 21 includes a plurality of walls so that the battery cell 20 is a polyhedral structure.
  • the embodiment of the present application is mainly described by taking the shell as a rectangular parallelepiped structure as an example.
  • the shell 21 may include six walls.
  • the present embodiment defines three reference directions. As shown in Figures 3 to 5, the thickness direction of the battery cell 20 is direction Y, the height direction of the battery cell 20 is direction Z, and the width direction of the battery cell 20 is direction X, wherein the thickness direction Y, height direction Z, and width direction X of the battery cell 20 are perpendicular to each other.
  • the housing 21 of the embodiment of the present application may include a shell 211 and a cover plate 212.
  • the shell 211 may be a hollow structure with an opening 2111 formed at one end or at multiple ends.
  • one cover plate 212 may be provided;
  • the shell 211 is a hollow structure with openings 2111 formed at two opposite ends, two cover plates 212 may be provided, and the two cover plates 212 respectively cover the openings at both ends of the shell 211.
  • the embodiment of the present application takes the case where the housing 211 has an opening 2111 as an example, and correspondingly, the cover plate 212 is used to cover the opening 2111.
  • the cover plate 212 of the embodiment of the present application covers the opening 2111 of the housing 211, for example, by welding, to achieve a sealed connection between the housing 211 and the cover plate 212, so as to improve the sealing reliability.
  • the housing 211 of the embodiment of the present application is sealedly connected to the cover plate 212, that is, the housing 211 and the cover plate 212 are sealedly connected around the opening 2111, thereby forming a connection structure 216 around the opening 2111.
  • the connection structure 216 includes an edge region of the housing 211 surrounding the opening 2111, and an outer edge region of the cover plate 211 corresponding thereto; and the edge region of the housing 211 contacts the edge region of the cover plate 212 and is sealedly connected in at least a part of the region, thereby forming a connection structure 216 protruding from the outer surface of the cover plate 212 and the outer surface of the housing 211, wherein the outer surface of the housing 211 and the outer surface of the cover plate 212 both represent surfaces away from the interior of the battery cell 20.
  • the outer surface of the first side wall 2112 of the housing 211 is the surface of the first side wall 2112 away from the interior of the battery cell 20.
  • connection structure 216 of the embodiment of the present application includes the portion where the housing 211 contacts the cover plate 212, but is not limited to the actual sealing area.
  • the actual welding area may be smaller than or equal to the area of the connection structure 216, that is, welding may be performed in at least a portion of the area of the connection structure 216.
  • the first side wall 2112 of the shell 211 is provided with an electrode terminal 214 , and the first region 2161 of the connection structure 216 is a region corresponding to the electrode terminal 214 , that is, the first region 2161 is a region close to the electrode terminal 214 and located around the electrode terminal 214 .
  • the orthographic projection of the portion of the electrode terminal 214 protruding from the first side wall 2112 on the connection structure 216 is the projection of the portion of the electrode terminal 214 protruding from the first side wall 2112 along the thickness direction of the connection structure 216, or in other words, the projection along the direction perpendicular to the surface of the connection structure 216.
  • the orthographic projection of the portion of the electrode terminal 214 protruding from the first side wall 2112 on the connection structure 216 is perpendicular to the thickness direction Y of the battery cell 20.
  • the orthographic projection does not exceed the first area, that is, the range of the orthographic projection is less than or equal to the range of the first area.
  • the welding seal can be performed along the edge of the first area 2161 away from the inside of the battery cell 20, or along the edge of the first area 2161 away from the electrode terminal 214. Since the first area 2161 has a large range, it will not be affected or is difficult to be affected by the electrode terminal 214 with a relatively small range, and it is also difficult to affect the electrode terminal 214, thereby improving the sealing efficiency, ensuring the sealing reliability, and improving the processing efficiency and safety performance of the battery cell 20.
  • the orthographic projection of the portion of the electrode terminal 214 protruding from the outer surface of the first side wall 2112 on the connection structure 216 does not exceed the first region 2161, which may include multiple situations.
  • the height H1 of the first region 2161 protruding from the outer surface of the first side wall 2112 is greater than the height H2 of the electrode terminal 214 protruding from the outer surface of the first side wall 2112.
  • the height H1 of the first region 2161 is not equal to the height H2 of the electrode terminal 214, that is, the height H1 of the first region 2161 is larger, there is a height difference between the outer edge of the connection structure 216 perpendicular to the height direction of the first region 2161 and the corresponding outer edge of the electrode terminal 214.
  • the sealed connection between the shell 211 and the cover plate 212 in this area will not be affected or will hardly be affected by the electrode terminal 214 with a relatively small height, and it is also difficult to affect the electrode terminal 214, thereby improving the sealing efficiency, ensuring the sealing reliability, and improving the processing efficiency and safety performance of the battery cell 20.
  • the height H1 of the first area 2161 in the embodiment of the present application may refer to: the minimum height of different areas of the first area 2161 along the height direction of the first area 2161.
  • the height direction of the first area 2161 is perpendicular to the first side wall 2112, that is, the height direction of the first area 2161 is the thickness direction of the first side wall 2112.
  • the height direction of the first area 2161 is the height direction Z of the battery cell 20.
  • the heights of different areas of the first area 2161 can be set to be equal to facilitate processing.
  • the value of the difference H between the height H1 of the first region 2161 protruding from the outer surface of the first side wall 2112 and the height H2 of the electrode terminal 214 protruding from the outer surface of the first side wall 2112 can be flexibly set according to the actual application.
  • the height difference H is set too large, since the height H2 of the electrode terminal 214 protruding from the outer surface of the first side wall 2112 is relatively fixed, the height H1 of the first region 2161 protruding from the outer surface of the first side wall 2112 is relatively large, which will cause the local height of the battery cell 20 to be too high, which will affect the assembly of multiple battery cells 20 inside the battery 10 and reduce the space utilization of the battery 10.
  • the height difference H is set too small, that is, the height H1 of the first area 2161 protruding from the outer surface of the first side wall 2112 is close to the height H2 of the electrode terminal 214 protruding from the outer surface of the first side wall 2112, then even if the edge of the first area 2161 away from the inside of the battery cell 20 is sealed to connect the shell 211 and the cover plate 212, it is still easily affected by the electrode terminal 214, which will affect the sealing reliability and further affect the processing efficiency of the battery cell 20.
  • the height difference should not be set too large or too small.
  • the difference H between the height H1 of the first region 2161 protruding from the outer surface of the first side wall 2112 and the height H2 of the electrode terminal 214 protruding from the outer surface of the first side wall 2112 is in the range of [0.5 mm, 2 mm].
  • the height difference H can be specifically set to 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2 mm.
  • the value of the height H1 of the first area 2161 protruding from the outer surface of the first side wall 2112 in the embodiment of the present application can be set according to actual applications.
  • the value range of the height H1 of the first area 2161 protruding from the outer surface of the first side wall 2112 can generally be set to [1mm, 7mm].
  • the height H1 of the first area 2161 protruding from the outer surface of the first side wall 2112 can be specifically set to 1mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.3mm, 4.5mmm, 4.8mm, 5mm, 5.3mm, 5.5mmm, 5.8mm, 6mm, 6.3mm, 6.5mmm, 6.8mm or 7mm.
  • the value of the height H2 of the electrode terminal 214 protruding from the outer surface of the first side wall 2112 in the embodiment of the present application can be set according to the actual application.
  • the value range of the height H2 of the electrode terminal 214 protruding from the outer surface of the first side wall 2112 can generally be set to [0.5mm, 5mm].
  • the height H2 of the electrode terminal 214 protruding from the outer surface of the first side wall 2112 can be specifically set to 0.5mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.3mm, 4.5mmm, 4.8mm or 5mm.
  • the length L1 of the first region 2161 is greater than the length L2 of the electrode terminal 214, and the length direction is perpendicular to the thickness direction of the first region 2161 and the height direction of the first region 2161 protruding from the outer surface of the first side wall 2112.
  • the length L1 of the first region 2161 can also be set to be greater than the length L2 of the electrode terminal 214, that is, the length L1 of the first region 2161 is greater than the length of the orthographic projection of the portion of the electrode terminal 214 protruding from the outer surface of the first side wall 2112 on the connection structure 216.
  • the welding seal can be performed along the edge of the first region 2161 away from the inside of the battery cell 20. Since the length L1 of the first region 2161 is not equal to the length L2 of the electrode terminal 214, that is, the length L1 of the first region 2161 is larger, there is a length difference between the outer edge of the connecting structure 216 perpendicular to the length direction of the first region 2161 and the corresponding outer edge of the electrode terminal 214.
  • the sealed connection between the shell 211 and the cover plate 212 in this area will not be affected or will hardly be affected by the electrode terminal 214 with a relatively small height, and it is also difficult to affect the electrode terminal 214, thereby improving the sealing efficiency, ensuring the sealing reliability, and improving the processing efficiency and safety performance of the battery cell 20.
  • the length direction of the first region 2161 is perpendicular to the thickness direction of the first region 2161, and is also perpendicular to the height direction of the outer surface of the first region 2161 protruding from the first side wall 2112.
  • the thickness direction of the first region 2161 of the connection structure 216 is the thickness direction Y of the battery cell 20
  • the height direction of the first region 2161 is the height direction Z of the battery cell 20.
  • the length of the first region 2161 is the width direction X of the battery cell 20, but the embodiments of the present application are not limited thereto.
  • the length L1 of the first region 2161 may refer to: the minimum value of the lengths of different regions of the first region 2161 along the length direction of the first region 2161.
  • the lengths of different regions of the first region 2161 may be set to be equal, for example, the first region 2161 may be set to be rectangular for easy processing.
  • the value range of the difference between the length L1 of the first region 2161 and the length L2 of the electrode terminal 214 can be set according to the actual application; and, at both ends along the length direction of the first region 2161, the difference between the length of the first region 2161 and the electrode terminal 214 can be equal or unequal.
  • the value range of the minimum distance L between the edge of the first region 2161 and the corresponding orthographic projection can be set according to the actual application.
  • the distance L is set too large, since the length L2 of the electrode terminal 214 is relatively fixed, the length L1 of the first region 2161 is too large, which will cause the protruding first region 2161 to occupy a large space, which is likely to affect the assembly between the multiple battery cells 20 inside the battery 10 and reduce the space utilization of the battery 10.
  • the distance L is set too small, the distance between the edge of the electrode terminal 214 and the edge of the first area 2161 is small. Then, even if the shell 211 and the cover plate 212 are sealed and connected at the outer edge of the first area 2161 away from the electrode terminal 214, they are still easily affected by the electrode terminal 214, which will affect the sealing reliability and further affect the processing efficiency of the battery cell 20.
  • the value of the distance L should not be too large or too small.
  • the value range of the minimum distance L between the edge of the first area 2161 and the orthographic projection is [0.5mm, 5mm].
  • the distance L can be specifically set to 0.5mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.3mm, 4.5mm, 4.8mm or 5mm.
  • the value of the length L1 of the first region 2161 can be set according to actual applications.
  • the value range of the length L1 of the first region 2161 can be set to [2.5 mm, 25 mm].
  • the length L1 of the first region 2161 can be specifically set to 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm or 25 mm.
  • the length L2 of the electrode terminal 214 can be set according to actual applications.
  • the length L2 of the electrode terminal 214 can be set to a range of [2 mm, 20 mm].
  • the length L2 of the electrode terminal 214 can be specifically set to 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm.
  • the first side wall 2112 in the embodiment of the present application is provided with an electrode terminal 214
  • the electrode terminal 214 can be any electrode terminal 214 included in the battery cell 20.
  • the electrode terminal 214 is used to electrically connect to the electrode assembly inside the battery cell 20 to output the electrical energy of the battery cell 20.
  • the battery cell 20 may include at least two electrode terminals 214, and the at least two electrode terminals 214 may include at least one positive electrode terminal 214a and at least one negative electrode terminal 214b, the positive electrode terminal 214a is used to electrically connect to the positive electrode tab of the electrode assembly, and the negative electrode terminal 214b is used to electrically connect to the negative electrode tab of the electrode assembly.
  • the positive electrode terminal 214a can be directly connected to the positive electrode tab or indirectly connected, and the negative electrode terminal 214b can be directly connected to the negative electrode tab or indirectly connected.
  • the positive electrode terminal 214 a is electrically connected to the positive electrode tab 222 a via a connecting member 23
  • the negative electrode terminal 214 b is electrically connected to the negative electrode tab 222 b via a connecting member 23 .
  • different electrode terminals 214 can be located on the same wall or different walls of the battery cell 20.
  • the embodiment of the present application takes the battery cell 20 including two electrode terminals 214, and the two electrode terminals 214 are located on the same wall as an example, for example, they can be both located on the first side wall 2112.
  • the housing 211 has a plurality of first side walls 2112, each of the plurality of first side walls 2112 is provided with at least one electrode terminal 214, and the connecting structure 216 has a plurality of first areas 2161, so that the electrode terminal 214 provided on each first side wall 2112 has at least one corresponding first area 2161.
  • the embodiment of the present application takes the battery cell 20 including one first side wall 2112 as an example, and when the battery cell 20 includes a plurality of first side walls 2112, the relevant description is applicable to each first side wall 2112.
  • the first side wall 2112 of the battery cell 20 of the embodiment of the present application may include a plurality of electrode terminals 214, and the connection structure 216 may include at least one first region 2161.
  • the first side wall 2112 of the battery cell 20 includes a plurality of electrode terminals 214, some of the plurality of electrode terminals 214 may be provided with corresponding first regions 2161.
  • the height of the positive electrode terminal 214a is generally greater than the height of the negative electrode terminal 214b, that is, the portion of the positive electrode terminal 214a protruding from the outer surface of the first side wall 2112 is likely to affect the sealing connection between the shell 211 and the cover plate 212, so when the first side wall 2112 includes at least one positive electrode terminal 214a and at least one negative electrode terminal 214b, only the at least one positive electrode terminal 214a can be set to correspond to at least one first area 2161, and the first area 2161 is not set to correspond to the negative electrode terminal 214b, that is, the electrode terminal 214 of the embodiment of the present application is the positive electrode terminal 214a, so as to avoid the influence of the positive electrode terminal 214a on the sealing connection between the shell 211 and the cover plate 212.
  • FIG6 shows another schematic diagram of the structure of the battery cell 20 of the embodiment of the present application.
  • the first side wall 2112 is provided with a plurality of electrode terminals 214
  • the connection structure 216 includes a plurality of first regions 2161 corresponding to the plurality of electrode terminals 214.
  • each electrode terminal 214 by providing a plurality of electrode terminals 214 corresponding to the plurality of first regions 2161, the influence of each electrode terminal 214 on the sealing connection between the housing and the cover plate 212 can be avoided; and, since it is not necessary to distinguish which electrode terminals 214 are provided with corresponding first regions 2161 and which electrode terminals 214 are not provided with corresponding first regions 2161, the processing efficiency and the assembly efficiency of the battery cell 20 can be improved.
  • FIG. 7 shows another structural schematic diagram of the battery cell 20 of the embodiment of the present application
  • FIG. 8 shows a side view schematic diagram of the battery cell 20 of the embodiment of the present application
  • FIG. 8 may be a schematic diagram of the side of the housing 211 of the battery cell 20 shown in FIG. 7 away from the cover plate 211.
  • the connection structure 216 includes a second region 2162 corresponding to the first side wall 2112, and the height H3 of the second region 2162 protruding from the outer surface of the first side wall 2112 is greater than the height H2 of the electrode terminal 214 protruding from the outer surface of the first side wall 2112, and the second region 2162 includes the first region 2161.
  • the second region 2162 is a region corresponding to the first side wall 2112, that is, the second region 2162 is a region of the connection structure 216 connected to the first side wall 2112.
  • the height H3 of the second area 2162 protruding from the first side wall 2112 is set to be greater than the height H2 of the electrode terminal 214 protruding from the outer surface of the first side wall 2112, that is, there is no need to separately set the partially protruding first area 2161, and the second area 2162 corresponding to the first side wall 2112 is set to be higher than the height H2 of the electrode terminal 214, that is, the second area 2162 includes the first area 2161 mentioned above.
  • the welding sealing can be performed along the outer edge of the second area 2162 away from the inside of the battery cell 20. Since the height H3 of the second area 2162 is large, it will not be affected or is difficult to be affected by the electrode terminal 214 with a relatively small height, and it is also difficult to affect the electrode terminal 214, thereby improving the sealing efficiency, ensuring the sealing reliability, and improving the processing efficiency and safety performance of the battery cell 20.
  • the height H3 of the second area 2162 in the embodiment of the present application may refer to: the minimum height of different areas of the second area 2162 along the height direction of the second area 2162.
  • the heights H3 of different areas of the second area 2162 may be set to be the same, but the embodiment of the present application is not limited thereto.
  • the battery cell 20 may also include a wall without an electrode terminal 214.
  • the housing 211 includes a second side wall 2113 adjacent to the opening 2111, the second side wall 2113 is not provided with an electrode terminal 214, and the connection structure 216 includes a third area 2163 corresponding to the second side wall 2113, and the height of the third area 2163 protruding from the outer surface of the second side wall 2113 is not equal to the height of the first area 2161 protruding from the outer surface of the first side wall 2112.
  • the outer surface of the second side wall 2113 in the embodiment of the present application is the surface of the second side wall 2113 away from the inside of the battery cell 20.
  • the protruding height of the third area 2163 corresponding to the second side wall 2113 may be set to be not equal to the height H1 of the first area 2161 protruding from the outer surface of the first side wall 2112, that is, different areas of the connection structure 216 of the battery cell 20 may have different heights. In this way, the setting of the third area 2163 does not need to consider the influence of the electrode terminal 214.
  • the height of the third area 2163 protruding from the outer surface of the second side wall 2113 can be reduced to reduce the space occupied by the third area 2163; on the contrary, if the third area 2163 still needs to avoid other components, the height of the third area 2163 protruding from the outer surface of the second side wall 2113 can be appropriately increased or reduced to avoid the influence of other components on the connecting structure 216, thereby improving the sealing reliability between the shell 211 and the cover plate 212.
  • the height of the third region 2163 protruding from the outer surface of the second side wall 2113 is less than the height of the first region 2161 protruding from the outer surface of the first side wall 2112.
  • the height of the side wall of the housing 211 where the electrode terminal 214 is not provided can be set to be smaller.
  • the battery cell 20 may have at least one wall without an electrode terminal 214, that is, the battery cell 20 may have at least one second side wall 2113.
  • FIG. 7 and FIG. 8 take the battery cell 20 including a first side wall 2112 and three second side walls 2113 as an example, that is, the connection structure 216 includes a second region 2162 corresponding to the first side wall 2112, and three third regions 2163 corresponding to the three second side walls 2113. As shown in FIG. 7 and FIG.
  • the height of the second region 2162 of the connection structure 216 protruding from the outer surface of the first side wall 2112 is H3; the height of the third region 2163 on the left side of the connection structure 216 protruding from the corresponding second side wall 2113 is H4; the height of the third region 2163 below the connection structure 216 protruding from the corresponding second side wall 2113 is H5; the height of the third region 2163 on the right side of the connection structure 216 protruding from the corresponding second side wall 2113 is H5.
  • the heights H3 to H6 can be set according to actual applications, and some of the heights can be set equal or all of the heights can be set unequal.
  • the heights H3 to H6 can be set to be unequal to each other to accommodate different side walls of the housing 211; for another example, the height H4 can be set equal to the height H6, but the heights H3, H4 and H5 can be set to be unequal, so that the connection structure 216 is a symmetrical structure for easy processing; for another example, the heights H4 to H6 can be set to be equal, but different from the height H3, and all are smaller than the height H3, so as to improve the processing efficiency of the battery cell 20, and reduce the space occupancy rate of the connection structure 216, thereby improving the energy density of the battery 10.
  • FIG. 9 shows a schematic diagram of the structure of the battery cell 20 before cutting of the embodiment of the present application.
  • the connection structure 216 between the shell 211 and the cover plate 212 can be set to protrude from the side wall of the shell 211 at a greater height; thereafter, the battery cell 20 shown in FIG. 9 can be cut, that is, the connection structure 216 is cut, so as to obtain the connection structures 216 of different battery cells 20 as shown in FIG. 3 to FIG. 8, and then the outer edge of the connection structure 216 away from the battery cell 20 is sealed and connected, for example, by welding, so as to seal the shell 211 and the cover plate 212 to obtain the processed battery cell 20.
  • the housing 21 of the embodiment of the present application may also be provided with other components.
  • the housing 21 may also be provided with an injection hole 2151 and a sealing component 215 for sealing the injection hole 2151.
  • the first side wall 2112 or the second side wall 2113 of the battery cell 20 may be provided with an injection hole 2151 and a sealing component 215 for sealing the injection hole 2151, the injection hole 2151 is used to inject electrolyte into the battery cell 20, and the sealing component 215 seals the injection hole 2151, for example, by laser welding to improve the sealing reliability.
  • connection structure 216 of the embodiment of the present application is described above in conjunction with the accompanying drawings.
  • the other parts of the battery cell 20 of the embodiment of the present application will be described below in conjunction with the accompanying drawings.
  • FIG10 shows a partial cross-sectional schematic diagram of a battery cell 20 according to an embodiment of the present application.
  • FIG10 may be a partial cross-sectional schematic diagram of a housing 211 of the battery cell 20, wherein the cross section is perpendicular to the thickness direction Y of the battery cell 20; the battery cell 20 shown in FIG10 may be any one of the battery cells 20 shown in FIG3 to FIG9.
  • FIG11 shows a partial cross-sectional enlarged schematic diagram of a battery cell 20 according to an embodiment of the present application, for example, FIG11 is an enlarged view of the area A shown in FIG10;
  • FIG12 shows a partial cross-sectional exploded schematic diagram of a battery cell 20 according to an embodiment of the present application, for example, FIG12 is an exploded structural schematic diagram of a partial battery cell 20 shown in FIG11.
  • the battery cell 20 also includes: an insulating structure 22, which is arranged on the side of the first side wall 2112 facing the inside of the battery cell 20, the first side wall 2112 is provided with a first through hole 2101, and the insulating structure 22 is provided with a second through hole 221 corresponding to the first through hole 2101, and the electrode terminal 214 passes through the first through hole 2101 and the second through hole 221 so that the first side wall 2112 and the insulating structure 22 are riveted.
  • an insulating structure 22 which is arranged on the side of the first side wall 2112 facing the inside of the battery cell 20, the first side wall 2112 is provided with a first through hole 2101, and the insulating structure 22 is provided with a second through hole 221 corresponding to the first through hole 2101, and the electrode terminal 214 passes through the first through hole 2101 and the second through hole 221 so that the first side wall 2112 and the insulating structure 22 are riveted.
  • the insulating structure 22 of the embodiment of the present application is disposed on the side of the first side wall 2112 facing the inside of the battery cell 20, that is, the insulating structure 22 and the first side wall 2112 are stacked along the thickness direction of the first side wall 2112.
  • the specific shape of the insulating structure 22 can be set according to actual applications.
  • the insulating structure 22 can be plate-shaped to fit with the first side wall 2112 so that the first side wall 2112 is electrically isolated from the internal components of the battery cell 20.
  • the insulating structure 22 can be used to electrically isolate the first side wall 2112 from the electrode assembly inside the battery cell 20 to avoid short circuit.
  • the arrangement of the electrode terminal 214 in the embodiment of the present application can be flexibly selected according to practical applications.
  • the first side wall 2112 is provided with a first through hole 2101
  • the insulating structure 22 is provided with a second through hole 221 corresponding to the first through hole 2101
  • the electrode terminal 214 passes through the first through hole 2101 and the second through hole 221, so that the first side wall 2112 and the insulating structure 22 are riveted, which facilitates processing and realizes the fixation between the electrode terminal 214, the first side wall 2112 and the insulating structure 22.
  • the battery cell 20 also includes: a sealing structure 24, which is arranged on the side of the first side wall 2112 away from the interior of the battery cell 20, and the sealing structure 24 is used to electrically isolate the electrode terminal 214 from the first side wall 2112.
  • the sealing structure 24 is usually made of an insulating material, and the sealing structure 24 is arranged between the first side wall 2112 and the electrode terminal 214, which can avoid a short circuit between the electrode terminal 214 and the first side wall 2112.
  • the sealing structure 24 is provided with a fifth through hole 241 , at least a portion of the fifth through hole 241 is accommodated in the first through hole 2101 , and the electrode terminal 214 passes through the fifth through hole 241 , so that the electrode terminal 214 and the first through hole 2101 are sealed.
  • a fifth through hole 241 is provided on the sealing structure 24, and at least a portion of the hole wall of the fifth through hole 241 is located in the first through hole 2101, or further, at least a portion of the hole wall of the fifth through hole 241 can also be located in the second through hole 221, so that when the electrode terminal 214 passes through the fifth through hole 241, a portion of the sealing structure 24 is provided between the electrode terminal 214 and the first through hole 2101 to avoid a short circuit; or further, a portion of the sealing structure 24 can also be provided between the electrode terminal 214 and the second through hole 221.
  • the first side wall 2112 is provided with a first through hole 2101 and the insulating structure 22 is provided with a second through hole 221, there may be gaps between the electrode terminal 214 and the first through hole 2101 and between the electrode terminal 214 and the second through hole 221, so the first through hole 2101 and the second through hole 221 can be sealed by the sealing structure 24.
  • the sealing structure 24 can be squeezed and deformed and then sealed to avoid leakage of internal electrolyte.
  • the electrode terminal 214 of the embodiment of the present application sequentially penetrates the sealing structure 24, the first side wall 2112 and the insulating structure 22.
  • the riveting effect of the electrode terminal 214 can limit the relative translation between the first side wall 2112 and the insulating structure 22, but cannot prevent the relative rotation between the first side wall 2112 and the insulating structure 22. Therefore, a limiting structure can be provided to further limit the misalignment between the first side wall 2112 and the insulating structure 22.
  • the first side wall 2112 is provided with a first limiting structure 201
  • the insulating structure 22 is provided with a second limiting structure 202 corresponding to the first limiting structure 201.
  • the second limiting structure 202 and the first limiting structure 201 cooperate with each other to prevent the relative movement between the insulating structure 22 and the first side wall 2112.
  • the first side wall 2112 and the insulating structure 22 can be positioned to facilitate installation therebetween; on the other hand, misalignment between the first side wall 2112 and the insulating structure 22 can be avoided.
  • relative translation between the first side wall 2112 and the insulating structure 22 can be avoided, thereby ensuring the insulation performance of the insulating structure 22 between the first side wall 2112 and other components inside the battery cell 20, avoiding short circuits, and improving the safety performance of the battery cell 20.
  • the matching mode of the first limiting structure 201 and the second limiting structure 202 in the embodiment of the present application can be flexibly set according to the actual application.
  • the first limiting structure 201 includes a first protruding structure protruding toward the insulating structure 22 relative to the first side wall 2112
  • the second limiting structure 202 includes a first groove structure opening toward the first side wall 2112, and at least a portion of the first protruding structure is accommodated in the first groove structure.
  • the surface of the first side wall 2112 facing the insulating structure 22 is provided with a first protruding structure protruding toward the insulating structure 22, and correspondingly, the surface of the insulating structure 22 facing the first side wall 2112 is provided with a first groove structure, and the opening of the first groove structure is facing the first side wall 2112.
  • the first limiting structure 201 includes a first protrusion structure
  • the second limiting structure 202 includes a first groove structure.
  • the first limiting structure 201 and the second limiting structure 202 cooperate with each other and can include at least a portion of the first protrusion structure being accommodated in the first groove structure, so that the first groove structure can limit the movement of the first protrusion structure, and further limit the movement of the first side wall 2112 relative to the insulating structure 22, so as to achieve the positioning and fixing function and avoid misalignment between the first side wall 2112 and the insulating structure 22; and the above-mentioned setting method is simple, the structure is stable, and it is easy to process.
  • the first limiting structure 201 includes a second groove structure with an opening toward the insulating structure 22, and the second limiting structure 202 includes a second protrusion structure protruding toward the first side wall 2112 relative to the insulating structure 22, and at least a portion of the second protrusion structure is accommodated in the second groove structure.
  • the surface of the first side wall 2112 facing the insulating structure 22 is provided with a second groove structure, and the opening of the second groove structure faces the insulating structure 22; correspondingly, the surface of the insulating structure 22 facing the first side wall 2112 is provided with a second protrusion structure protruding toward the first side wall 2112.
  • the first limiting structure 201 may include the second groove structure
  • the second limiting structure 202 may include the second protrusion structure.
  • the first limiting structure 201 and the second limiting structure 202 may cooperate with each other to include at least a portion of the second protrusion structure being accommodated in the second groove structure, so that the second groove structure can limit the movement of the second protrusion structure, and further limit the movement of the insulating structure 22 relative to the first side wall 2112, so as to achieve the positioning and fixing function and avoid misalignment between the first side wall 2112 and the insulating structure 22; and the above-mentioned setting method is simple, the structure is stable, and it is easy to process.
  • the first limiting structure 201 of the embodiment of the present application may include at least one first protrusion structure and/or at least one second groove structure, and correspondingly, the second limiting structure 202 may include at least one first groove structure and/or at least one second protrusion structure, and the embodiment of the present application is not limited thereto.
  • the first limiting structure 201 may include a first protrusion structure or a second groove structure disposed on the first side wall 2112
  • the second limiting structure 202 may include a first groove structure or a second protrusion structure disposed on the insulating structure 22 for ease of processing.
  • the arrangement of the first protrusion structure, the first groove structure, the second protrusion structure and the second groove structure in the embodiment of the present application can be flexibly selected according to practical applications to improve the processing efficiency of the battery cell 20.
  • first protruding structure and the second protruding structure can be realized by means of a groove.
  • the first protruding structure is a groove of the first side wall 2112 that is recessed toward the insulating structure 22 and protrudes from the inner surface of the first side wall 2112; and/or, the second protruding structure is a groove of the insulating structure 22 that is recessed toward the first side wall 2112 and protrudes from the outer surface of the insulating structure 22.
  • the first side wall 2112 is recessed toward the insulating structure 22 to form a groove, the bottom wall of the groove protrudes from the inner surface of the first side wall 2112, and the inner surface of the first side wall 2112 is the surface facing the inside of the battery cell 20, and the groove can be used as the first protruding structure.
  • the insulating structure 22 is recessed toward the first side wall 2112 to form a groove, the bottom wall of the groove protrudes from the outer surface of the insulating structure 22, and the outer surface of the insulating structure 22 is the surface away from the inside of the battery cell 20, and the groove can be used as the second protruding structure.
  • Arranging the first protrusion structure and/or the second protrusion structure by means of grooves can effectively reduce the weight of the first side wall 2112 and/or the insulating structure 22 compared to directly arranging a solid protrusion structure on the surface of the first side wall 2112 or the surface of the insulating structure 22, and the processing method is simple.
  • the first protrusion structure and the first groove structure can be processed simultaneously by stamping, or the second protrusion structure and the second groove structure can be processed simultaneously by stamping, thereby improving the processing efficiency of the battery cell 20.
  • first groove structure and the second groove structure may also be arranged with reference to the first protruding structure and the second protruding structure, respectively.
  • the first groove structure protrudes from the inner surface of the insulating structure 22; and/or, the second groove structure protrudes from the outer surface of the first side wall 2112.
  • the first groove structure of the insulating structure 22 is arranged to protrude from the inner surface of the insulating structure 22, wherein the inner surface of the insulating structure 22 is the surface facing the inside of the battery cell 20, and the depth of the first groove structure is less limited by the thickness of the insulating structure 22.
  • the depth of the first groove structure may be greater than the thickness of the insulating structure 22, so that the first protruding structure can be more accommodated in the first groove structure, so as to increase the stability between the first protruding structure and the first groove structure, and also increase the stability between the first limiting structure 201 and the second limiting structure 202.
  • the second groove structure of the first side wall 2112 is configured to protrude from the outer surface of the first side wall 2112, wherein the outer surface of the first side wall 2112 is a surface away from the interior of the battery cell 20. The depth of the second groove structure is less limited by the thickness of the first side wall 2112.
  • the depth of the second groove structure may be greater than the thickness of the first side wall 2112, so that the second protrusion structure can be more accommodated in the second groove structure to increase the stability between the second protrusion structure and the second groove structure, thereby increasing the stability between the first limiting structure 201 and the second limiting structure 202.
  • the thickness of the bottom wall of the groove may be less than or equal to or slightly greater than the thickness of the first side wall 2112 where the groove is located or the thickness of the insulating structure 22 where the groove is located.
  • the first protruding structure may also be a thicker bump on the first side wall 2112, for example, the thickness of the first protruding structure is greater than the thickness of other regions of the first side wall 2112 where the groove is located, so that the first protruding structure protrudes from the surface of the first side wall 2112 facing the insulating structure 22.
  • the second protruding structure may also be a thicker bump on the insulating structure 22, for example, the thickness of the second protruding structure is greater than the thickness of other regions of the insulating structure 22 where the groove is located, so that the second protruding structure protrudes from the surface of the insulating structure 22 facing the first side wall 2112.
  • the first protruding structure may be integrated with the first side wall 2112, for example, the first protruding structure may be formed on the first side wall 2112 by stamping, milling, etc.; or, the first protruding structure may be formed separately from the first side wall 2112, for example, the first side wall 2112 is formed with a through hole, and the first protruding structure is installed in the through hole, and the installation method may include welding, riveting, clamping, etc., and the present application does not impose any special restrictions on this.
  • the second protruding structure may also be formed integrally with or separately from the insulating structure 22, and the present application does not impose any special restrictions on this.
  • the battery cell 20 further includes: a connecting member 23, which is used to electrically connect to the electrode terminal 214.
  • the connecting member 23 is disposed on a side of the insulating structure 22 facing the inside of the battery cell 20.
  • the connecting member 23 is provided with a third through hole 231 corresponding to the second through hole 221.
  • the electrode terminal 214 passes through the third through hole 231, so that the connecting member 23, the insulating structure 22 and the first side wall 2112 are riveted.
  • the connecting member 23 of the embodiment of the present application can be used to electrically connect to the electrode terminal 214, and can also be used to electrically connect to the tab of the electrode assembly, so that the electrode terminal 214 is electrically connected to the tab.
  • the connecting member 23 is provided with a third through hole 231, and the first through hole 2101 of the first side wall 2112, the second through hole 221 of the insulating structure 22 and the third through hole 231 of the connecting member 23 are stacked in sequence, so that the electrode terminal 214 can pass through the first through hole 2101, the second through hole 221 and the third through hole 231 in sequence, thereby realizing riveting fixation between the first side wall 2112, the insulating structure 22 and the connecting member 23.
  • the processing process is simple, which is beneficial to improving the processing efficiency of the battery cell 20.
  • the electrode terminal 214 and the connecting member 23 may be connected by welding to further increase the connection stability between the electrode terminal 214 and the connecting member 23 and ensure the performance of the battery cell 20 .
  • the connecting member 23 further includes a third limiting structure 232, and the third limiting structure 232 cooperates with the second limiting structure 202 to prevent the relative movement between the connecting member 23 and the insulating structure 22.
  • the third limiting mechanism 232 of the connecting member 23 can cooperate with the second limiting structure 202, that is, the first limiting structure 201, the second limiting structure 202 and the third limiting structure 232 can cooperate with each other to prevent the relative movement between the first side wall 2112, the insulating structure 22 and the connecting member 23, and the connecting member 23 can be fixed to facilitate the assembly and installation of the battery cell 20, and the insulating structure 22 can also ensure that the first side wall 2112 and the connecting member 23 are electrically isolated to avoid a short circuit between the connecting member 23 and the first side wall 2112.
  • the third limiting structure 232 can be flexibly arranged according to the actual application, for example, the third limiting structure 232 can be arranged accordingly according to the arrangement of the first limiting structure 201 and the second limiting structure 202.
  • the first limiting structure 201 includes a first protrusion structure
  • the second limiting structure 202 includes a first groove structure
  • the first groove can protrude from the surface of the insulating structure 22 toward the connecting member 23, and
  • the third limiting structure 232 can include a groove or a through hole arranged on the connecting member 23, the opening of which is toward the insulating structure 22, for accommodating at least part of the first groove structure, so as to achieve mutual cooperation between the third limiting structure 232 and the second limiting structure 202.
  • the third limiting structure 232 includes a fourth through hole of the connecting member 23, and the fourth through hole is used to accommodate at least part of the second limiting structure 202.
  • the first limiting structure 201 may include a first protruding structure of the first side wall 2112
  • the second limiting structure 202 may include a first groove structure of the insulating structure 22, and the first groove structure protrudes from the surface of the insulating structure 22 facing the inside of the battery cell 20.
  • the third limiting structure 232 may include a fourth through hole to accommodate at least part of the first groove structure.
  • the fourth through hole can save the space occupied by the bottom wall of the groove, improve the space utilization rate inside the battery cell 20, and can also reduce the weight of the connecting member 23, and also can reduce the weight of the battery cell 20, thereby improving the performance of the battery cell 20.
  • a first groove structure of the insulating structure 22 is disposed between the inner wall of the fourth through hole and the first protruding structure, which can also prevent a short circuit between the connecting member 23 and the first side wall 2112 .
  • the third limiting structure 232 may include a third protrusion structure protruding toward the insulating structure 22, and the third protrusion structure is at least partially accommodated in the second protrusion structure to achieve mutual cooperation between the third limiting structure 232 and the second limiting structure 202.
  • the setting position and size of the first limiting structure 201 and the second limiting structure 202 of the embodiment of the present application can be flexibly set according to the actual application.
  • the size and position of the first limiting structure 201 can be set according to the size of the first side wall 2112
  • the size and position of the second limiting structure 202 are related to the size and position of the first limiting structure 202, so that the first limiting structure 201 and the second limiting structure 202 can cooperate with each other.
  • the first side wall 2112 and the first limiting structure 201 are used as an example for description.
  • FIG. 13 is a schematic diagram of the outer surface of the first side wall 2112 of the battery cell 20 of the embodiment of the present application, and the outer surface of the first side wall 2112 is the surface of the first side wall 2112 away from the inside of the battery cell 20.
  • the ratio L1/L2 of the distance L1 between the electrode terminal 214 and the first limiting structure 201 to the length L2 of the first side wall 2112 is in the range of [10%, 48%].
  • the distance L1 between the first limiting structure 201 and the electrode terminal 214 in the length direction X of the first side wall 2112 is too large, and the first limiting structure 201 is too far away from the electrode terminal 214, which will cause the first limiting structure 201 to be unable to effectively limit the relative movement between the first side wall 2112 and the insulating structure 22 during the installation of the electrode terminal 214, thereby affecting the processing efficiency of the battery cell 20.
  • the first side wall 2112 is provided with a first through hole 2101 for accommodating at least part of the electrode terminal 214.
  • the distance L1 between the first limiting structure 201 and the electrode terminal 214 is too small, the distance between the first limiting structure 201 and the first through hole 2101 will also be too small, and the two are likely to affect each other, thereby affecting the structural strength and stability of the first side wall 2112, thereby reducing the installation efficiency of the battery cell 20 and increasing the difficulty of processing.
  • the value of L1/L2 should not be set too large or too small.
  • the value range of L1/L2 can be [10%, 48%]; or it can be [20%, 40%]; or the value of L1/L2 can be set to 10%, 15%, 20%, 25%, 30%, 35%, 40%, or 45%.
  • the distance L1 between the electrode terminal 214 and the first limiting structure 201 in the embodiment of the present application can also be expressed as: the distance between the center of the electrode terminal 214 and the center of the first limiting structure 201 along the length direction X of the first side wall 2112.
  • the electrode terminal 214 in the distance L1 between the electrode terminal 214 and the first limiting structure 201 can represent any electrode terminal 214 on the first side wall 2112.
  • L1 can be the distance between the first limiting structure 201 and the electrode terminal 214 closest to the first limiting structure 201. As shown in FIG.
  • L1 is the distance between the first limiting structure 201 and the positive electrode terminal 214a, but the embodiment of the present application is not limited thereto.
  • the ratio W1/W2 of the size W1 of the first limiting structure 201 to the width W2 of the first side wall 2112 is in the range of [15%, 95%]. If the value of W1/W2 is too large, the size W1 of the first limiting structure 201 in the width direction Y of the first side wall 2112 is too large, which will increase the difficulty of processing the first limiting structure 201, and the first limiting structure 201 is likely to affect other walls intersecting with the first side wall 2112. On the contrary, if the value of W1/W2 is too small, then in the width direction Y of the first side wall 2112, the size W1 of the first limiting structure 201 is too small.
  • the width W2 of the first side wall 2112 is limited, the smaller size of the first limiting structure 201 will increase the processing difficulty of the first limiting structure 201, and it is also difficult to limit the relative movement between the first side wall 2112 and the insulating structure 22 by the first limiting structure 201 that is too small.
  • the value of W1/W2 should not be set too large or too small.
  • the value range of W1/W2 can be [15%, 95%]; or it can be [20%, 40%]; or the value of W1/W2 can be set to 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% or 95%.
  • the length direction X of the first side wall 2112 of the embodiment of the present application is perpendicular to the width direction Y, and the length L2 of the first side wall 2112 represents the dimension of the first side wall 2112 in the length direction X, the width W2 of the first side wall 2112 represents the dimension of the first side wall 2112 in the width direction Y, and the length L2 of the first side wall 2112 is greater than the width W2 of the first side wall 2112.
  • FIG14 is a schematic diagram of the outer surface of the cover plate 212 of the embodiment of the present application, wherein the outer surface of the cover plate 212 is the surface away from the inside of the battery cell 20; the cover plate 212 shown in FIG13 may be the cover plate 212 of the battery cell 20 shown in FIG7 and FIG8, but the relevant description is also applicable to the cover plate 212 of the battery cell 20 shown in FIG3 to FIG6, and for the sake of brevity, it is not repeated here.
  • FIG15 is a partial cross-sectional schematic diagram of the cover plate 212 of the embodiment of the present application, for example, the cross-sectional schematic diagram may be a partial schematic diagram of the cross section along the B-B' direction shown in FIG14.
  • the shell 211 of the embodiment of the present application can be in a variety of shapes, such as a cylinder, a cuboid or other polyhedron.
  • the shell 211 is mainly described as a cuboid structure.
  • the cover plate 212 of the embodiment of the present application is a component used to cover the opening 2111 of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment.
  • the shape of the cover plate 212 can be adapted to the shape of the shell 211.
  • the shell 211 is a cuboid structure
  • the cover plate 212 is a rectangular plate structure adapted to the shell 211.
  • the inner space formed by the shell 211 and the cover plate 212 can be used to accommodate the electrode terminal.
  • the electrode assembly is a component where an electrochemical reaction occurs in the battery cell 20.
  • the electrode assembly may include a tab and an electrode body, wherein the tab of the electrode assembly may include a positive tab and a negative tab, the positive tab may be formed by stacking a portion of the positive electrode sheet that is not coated with the positive electrode active material layer, the negative tab may be formed by stacking a portion of the negative electrode sheet that is not coated with the negative electrode active material layer, and the electrode body may be formed by stacking or winding a portion of the positive electrode sheet that is coated with the positive electrode active material layer and a portion of the negative electrode sheet that is coated with the negative electrode active material layer.
  • the electrode assembly in the housing 211 can be set to one or more.
  • the electrode assembly can be a cylinder, a cuboid, etc. If the electrode assembly is a cylindrical structure, the housing 211 can also be a cylindrical structure. If the electrode assembly is a cuboid structure, the housing 211 can also be a cuboid structure.
  • the cover plate 212 of the embodiment of the present application can be any wall of the battery cell 20.
  • the cover plate 212 is the wall with the largest area of the battery cell 20. This facilitates the installation of components inside the battery cell 20, for example, it can facilitate the installation of the electrode assembly and speed up the processing speed of the battery cell 20.
  • the material of the housing 21 of the embodiment of the present application can be flexibly set according to the actual application, and the material of the cover plate 212 can be the same as or different from the material of the shell 211.
  • the material of the shell 211 includes stainless steel and/or alloy; and/or, the material of the cover plate 212 includes stainless steel and/or alloy, so that the shell 211 and the cover plate 212 have strong hardness to ensure the structural strength of the battery cell 20.
  • the material of the shell 211 can be multiple, such as copper, iron, aluminum, steel, aluminum alloy, etc.
  • the material of the cover plate 212 can also be multiple, such as copper, iron, aluminum, steel, aluminum alloy, etc.
  • the thickness of the shell 21 of the embodiment of the present application can be flexibly set according to the actual application, and the thickness of different walls of the shell 21 can be the same or different.
  • the thickness of the cover plate 212 can be the same as or different from the thickness of the shell 211; the thickness of different walls of the shell 211 can be the same or different.
  • the value range of the thickness T of the cover plate 212 is [50 ⁇ m, 200 ⁇ m] to ensure the structural strength of the battery cell 20.
  • the thickness T of the cover plate 212 can be set to 50 ⁇ m, 60 ⁇ m, 70 ⁇ m, 80 ⁇ m, 90 ⁇ m, 100 ⁇ m, 110 ⁇ m, 120 ⁇ m, 130 ⁇ m, 140 ⁇ m, 150 ⁇ m, 160 ⁇ m, 170 ⁇ m, 180 ⁇ m, 190 ⁇ m or 200 ⁇ m.
  • the thickness of any wall of the shell 211 is in the range of [50 ⁇ m, 200 ⁇ m] to ensure the structural strength of the battery cell 20.
  • the thickness T of any wall of the shell 211 can be set to 50 ⁇ m, 60 ⁇ m, 70 ⁇ m, 80 ⁇ m, 90 ⁇ m, 100 ⁇ m, 110 ⁇ m, 120 ⁇ m, 130 ⁇ m, 140 ⁇ m, 150 ⁇ m, 160 ⁇ m, 170 ⁇ m, 180 ⁇ m, 190 ⁇ m or 200 ⁇ m.
  • the housing 21 of the battery cell 20 of the embodiment of the present application may also be provided with a pressure relief mechanism 213.
  • the cover plate 212 is provided with a pressure relief mechanism 213; or, unlike FIGS. 14 and 15 , the pressure relief mechanism 213 may also be provided on a wall opposite to the cover plate 212; or, the pressure relief mechanism may also be provided on other walls.
  • the pressure relief mechanism 213 of the embodiment of the present application is used to actuate to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold.
  • the predetermined threshold value can be adjusted according to different design requirements.
  • the predetermined threshold value may depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte and isolation membrane in the battery cell 20.
  • the "actuation" mentioned in this application refers to the action of the pressure relief mechanism 213, so that the internal pressure and temperature of the battery cell 20 can be released.
  • the action produced by the pressure relief mechanism 213 may include but is not limited to: at least a part of the pressure relief mechanism 213 is broken, torn or melted, etc. After the pressure relief mechanism 213 is actuated, the high-temperature and high-pressure substances inside the battery cell 20 will be discharged from the pressure relief mechanism 213 as emissions. In this way, the battery cell 20 can be depressurized under controllable pressure or temperature, thereby avoiding potential more serious accidents.
  • the emissions from the battery cells 20 mentioned in the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the isolation membrane, high-temperature and high-pressure gas generated by the reaction, flames, and the like.
  • the pressure relief mechanism 213 on the battery cell 20 has an important impact on the safety of the battery. For example, when the battery cell 20 is short-circuited or overcharged, thermal runaway may occur inside the battery cell 20, causing a sudden increase in pressure or temperature. In this case, the pressure relief mechanism 213 can be activated to release the internal pressure and temperature to the outside to prevent the battery cell 20 from exploding or catching fire.
  • the pressure relief mechanism 213 of the embodiment of the present application can be arranged on any wall of the housing 21 of the battery cell 20.
  • the embodiment of the present application takes the pressure relief mechanism 213 being arranged on the cover plate 212 as an example, but the relevant description is also applicable to the case where the pressure relief mechanism 213 is located on other walls.
  • the pressure relief mechanism 213 can be a part of the cover plate 212, or it can be a separate structure from the cover plate 212, and fixed to the cover plate 212 by, for example, welding.
  • the pressure relief mechanism 213 may also be a separate structure from the cover plate 212.
  • the pressure relief mechanism 213 may take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and may specifically adopt pressure-sensitive or temperature-sensitive elements or structures. That is, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 213 executes an action or a weak structure provided in the pressure relief mechanism 213 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.
  • the pressure relief mechanism 213 when the pressure relief mechanism 213 is a part of the cover plate 212, for example, the pressure relief mechanism 213 can be formed by providing a notch on the cover plate 212, that is, the pressure relief mechanism 213 is a notch of the cover plate 212, then the thickness of the area where the notch is located is less than the thickness of other areas of the cover plate 212 except for the notch.
  • the notch is the weakest position of the pressure relief mechanism 213.
  • the pressure relief mechanism 213 may rupture at the notch, causing the inside and outside of the shell 211 to communicate with each other, and the gas pressure and temperature are released outward through the rupture of the pressure relief mechanism 213, thereby preventing the battery cell 20 from exploding.
  • the pressure relief mechanism 213 is an L-shaped notch provided on the outer surface of the battery cell 20.
  • the pressure relief mechanism 213 is located on the cover plate 212, the pressure relief mechanism 213 is located on the L-shaped notch on the surface of the cover plate 212 away from the inside of the battery cell 20, that is, the pressure relief mechanism 213 has two parts that are connected to each other and perpendicular to each other. In this way, when the temperature or pressure inside the battery cell 20 reaches a preset threshold, the pressure relief mechanism 213 can be destroyed in any direction, so that the pressure relief mechanism 213 is destroyed in time, and the pressure and temperature inside the battery cell 20 are released in time to avoid the explosion of the battery cell 20.
  • the pressure relief mechanism 213 is provided on the outer surface of the cover plate 212 to prevent the electrolyte inside the battery cell 20 from accumulating in the notch, and to prevent the electrolyte from corroding the pressure relief mechanism 213, thereby improving the safety of the pressure relief mechanism 213.
  • the cross-section of the notch can be an isosceles trapezoid, which is easy to process on the one hand, and on the other hand, compared with a rectangular cross-section, it can avoid stress concentration and improve the stability of the pressure relief mechanism 213 during normal use of the battery cell 20.
  • connection structure 216 includes a first area 2161 corresponding to the electrode terminal 214 located on the first side wall 2112 of the housing 211, and the orthographic projection of the portion of the electrode terminal 214 protruding from the outer surface of the first side wall 2112 on the connection structure 216 does not exceed the first area 2161, that is, the range of the first area 2161 is greater than or equal to the range of the orthographic projection.
  • welding sealing can be performed along the edge of the first area 2161 away from the interior of the battery cell 20, or welding sealing can be performed along the edge of the first area 2161 away from the electrode terminal 214. Since the first area 2161 has a larger range, it will not be affected or will hardly be affected by the electrode terminal 214 with a relatively smaller range, and it is also difficult to affect the electrode terminal 214, thereby improving the sealing efficiency, ensuring the sealing reliability, and improving the processing efficiency and safety performance of the battery cell 20.

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Abstract

本申请实施例提供一种电池单体、电池和用电设备。该电池单体包括：壳体，该壳体为具有开口的中空结构，该壳体的与该开口相邻的第一侧壁设置有电极端子；盖板，用于盖合该开口，该盖板和该壳体密封连接并形成有围绕该开口的连接结构，该连接结构包括与该电极端子对应的第一区域，该电极端子的凸出于该第一侧壁的外表面的部分在该连接结构上的正投影不超出该第一区域。本申请实施例的电池单体、电池和用电设备，能够提高电池单体的加工效率。

Description

电池单体、电池和用电设备 技术领域
本申请涉及电池技术领域，特别是涉及一种电池单体、电池和用电设备。
背景技术
节能减排是汽车产业可持续发展的关键。在这种情况下，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。而对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。在电池技术的飞速发展中，如何提高电池的加工生产效率，是电池技术中一个亟待解决的技术问题。
发明内容
本申请实施例提供了一种电池单体、电池和用电设备，能够提高电池单体的加工效率。
第一方面，提供了一种电池单体，包括：壳体，该壳体为具有开口的中空结构，该壳体的与该开口相邻的第一侧壁设置有电极端子；盖板，用于盖合该开口，该盖板和该壳体密封连接并形成有围绕该开口的连接结构，该连接结构包括与该电极端子对应的第一区域，该电极端子的凸出于该第一侧壁的外表面的部分在该连接结构上的正投影不超出该第一区域。
因此，在本申请实施例中，在对电池单体的壳体和盖板进行密封连接时，例如通过焊接的方式密封时，可以沿着该第一区域的远离电池单体的内部的边缘进行焊接密封，或者说沿着该第一区域的远离电极端子的边缘进行焊接密封，由于第一区域的范围较大，所以不会受到或者很难受到范围相对较小的电极端子的影响，也很难对电极端子产生影响，从而可以提高密封效率，保证密封可靠性，提高电池单体的加工效率和安全性能。
在一些实施例中，该第一区域凸出于第一侧壁的外表面的高度大于该电极端子凸出于该第一侧壁的外表面的高度。这样，在对电池单体的壳体和盖板进行密封连接时，例如通过焊接的方式密封时，可以沿着该第一区域的远离电池单体的内部的边缘进行焊接密封。由于第一区域的高度不等于电极端子的高度，即第一区域的高度较大，则连接结构的垂直于该第一区域的高度方向的外边缘与电极端子的对应外边缘之间具有高度差，壳体和盖板在该区域的密封连接不会受到或者很难受到高度相对较小的电极端子的影响，也很难对电极端子产生影响，从而可以提高密封效率，保证密封可靠性，提高电池单体的加工效率和安全性能。
在一些实施例中，该第一区域凸出于第一侧壁的外表面的高度与该电极端子凸 出于该第一侧壁的外表面的高度的差值的取值范围为[0.5mm，2mm]。
若该高度差值设置过大，由于电极端子凸出于第一侧壁的外表面的高度相对固定，因此第一区域凸出于第一侧壁的外表面的高度相对较大，这会导致电池单体的局部高度过高，会影响电池内部多个电池单体之间的组装，降低电池的空间利用率。相反的，若该高度差值设置过小，即第一区域凸出于第一侧壁的外表面的高度与电极端子凸出于第一侧壁的外表面的高度相近，那么即使在第一区域的远离电池单体的内部的边缘密封连接壳体和盖板，还是容易受到电极端子的影响，也就会影响密封可靠性，进而影响电池单体的加工效率。
在一些实施例中，在该第一区域的长度方向上，该第一区域的长度大于该电极端子的长度，该长度方向分别垂直与该第一区域的厚度方向和该第一区域的凸出于该第一侧壁的外表面的高度方向。
在对电池单体的壳体和盖板进行密封连接时，例如通过焊接的方式密封时，可以沿着该第一区域的远离电池单体的内部的边缘进行焊接密封。由于第一区域的长度不等于电极端子的长度，即第一区域的长度较大，则连接结构的垂直于该第一区域的长度方向的外边缘与电极端子的对应外边缘之间具有长度差，壳体和盖板在该区域的密封连接不会受到或者很难受到高度相对较小的电极端子的影响，也很难对电极端子产生影响，从而可以提高密封效率，保证密封可靠性，提高电池单体的加工效率和安全性能。
在一些实施例中，在该第一区域的长度方向上，该第一区域的边缘与该正投影的最小距离的取值范围为[0.5mm，5mm]。
若该距离设置过大，由于电极端子的长度相对固定，则该第一区域的长度过大，这会导致凸出的第一区域占用空间较大，很可能影响电池内部多个电池单体之间的组装，降低电池的空间利用率。相反地，若该距离设置过小，则电极端子的边缘与第一区域的边缘之间的距离较小，那么即使在第一区域的远离电极端子的外边缘密封连接壳体和盖板，还是容易受到电极端子的影响，也就会影响密封可靠性，进而影响电池单体的加工效率。
在一些实施例中，该第一侧壁设置有多个该电极端子，该连接结构包括与多个该电极端子一一对应的多个该第一区域。设置多个电极端子与多个第一区域一一对应，可以避免每个电极端子对壳体与盖板之间的密封连接的影响；并且，由于不需要区分哪些电极端子设置有对应的第一区域以及哪些电极端子未设置有对应的第一区域，可以提高加工效率和电池单体的组装效率。
在一些实施例中，该连接结构包括与该第一侧壁对应的第二区域，该第二区域凸出于第一侧壁的外表面的高度大于该电极端子凸出于该第一侧壁的外表面的高度，该第二区域包括该第一区域。
这样，在对电池单体的壳体和盖板进行密封连接时，例如通过焊接的方式密封时，对于第一侧壁对应的区域，可以沿着该第二区域的远离电池单体的内部的外边缘进行焊接密封，由于第二区域的高度较大，所以不会受到或者很难受到高度相对较小的电极端子的影响，也很难对电极端子产生影响，从而可以提高密封效率，保证密封 可靠性，提高电池单体的加工效率和安全性能。
在一些实施例中，该电极端子为正极电极端子。考虑到正极电极端子的高度通常大于负极电极端子的高度，即正极电极端子凸出于第一侧壁的外表面的部分容易影响壳体与盖板之间的密封连接，所以设置正极电极端子与第一区域对应，而不设置第一区域与负极电极端子对应，也可以有效避免正极电极端子对壳体与盖板之间的密封连接的影响。
在一些实施例中，该壳体具有多个该第一侧壁，以使每个第一侧壁上设置的电极端子具有对应的第一区域，以提高壳体和盖板之间的密封可靠性。
在一些实施例中，该壳体包括与该开口相邻的第二侧壁，该第二侧壁未设置有电极端子，该连接结构包括与该第二侧壁对应的第三区域，该第三区域凸出于该第二侧壁的外表面的高度不等于该第一区域凸出于该第一侧壁的外表面的高度。
该第三区域的设置无需考虑电极端子的影响，例如，若该第三区域无需避让其他部件，则可以减小该第三区域的凸出于第二侧壁的外表面的高度，以减小该第三区域占用的空间；相反的，若该第三区域还需要避让其他部件，则可以适当增加或者减小该第三区域的凸出于第二侧壁的外表面的高度，以避免其他部件对连接结构的影响，进而提高壳体和盖板之间的密封可靠性。
在一些实施例中，该第三区域凸出于该第二侧壁的外表面的高度小于该第一区域凸出于该第一侧壁的外表面的高度。考虑到壳体的侧壁上除电极端子以外，通常不会设置其他高度较高的部件，或者对壳体和盖板之间的密封连接具有影响的部件，因此，可以设置壳体的未设置电极端子的侧壁的高度较小。
在一些实施例中，该电池单体还包括：绝缘结构，该绝缘结构设置在该第一侧壁的朝向该电池单体的内部的一侧，该第一侧壁设置有第一通孔，该绝缘结构设置有与该第一通孔对应的第二通孔，该电极端子贯穿该第一通孔和该第二通孔，以使该第一侧壁和该绝缘结构铆接，这样便于加工和实现电极端子、第一侧壁和绝缘结构之间的固定。
在一些实施例中，该电池单体还包括：密封结构，设置在该第一侧壁的远离该电池单体的内部的一侧，该密封结构用于电隔离该电极端子与该第一侧壁。该密封结构通常采用绝缘材料，将密封结构设置在第一侧壁和电极端子之间，可以避免电极端子与第一侧壁之间发生短路。
在一些实施例中，该密封结构设置有第五通孔，该第五通孔的至少部分容纳在该第一通孔内，该电极端子贯穿该第五通孔，以使该电极端子与该第一通孔之间密封。
由于第一侧壁设置有第一通孔，且绝缘结构设置有第二通孔，则电极端子与第一通孔之间以及电极端子与第二通孔之间可能存在空隙，所以可以通过该密封结构密封第一通孔和第二通孔，例如，可以在铆接挤压的过程中，密封结构被挤压变形进而密封，以避免内部电解液泄漏。
在一些实施例中，该第一侧壁设置有第一限位结构，该绝缘结构设置有与该第一限位结构对应的第二限位结构，该第二限位结构和该第一限位结构相互配合，以阻止该绝缘结构与该第一侧壁之间的相对移动。
一方面能够对第一侧壁和绝缘结构进行定位，以便于二者之间的安装；另一方面还能够避免第一侧壁和绝缘结构之间发生错位，例如，可以避免第一侧壁和绝缘结构之间相对平移，也就保证了绝缘结构对该第一侧壁与电池单体内部其他部件之间的绝缘性能，避免短路，并提高电池单体的安全性能。
在一些实施例中，该电池单体还包括：连接构件，用于与该电极端子电连接，该连接构件设置在该绝缘结构的朝向该电池单体的内部的一侧，该连接构件设置有与该第二通孔对应的第三通孔，该电极端子贯穿该第三通孔，以使该连接构件、该绝缘结构和该第一侧壁铆接。
连接构件设置有第三通孔，将第一侧壁的第一通孔、绝缘结构的第二通孔以及连接构件的第三通孔依次堆叠设置，以使得该电极端子可以依次贯穿该第一通孔、第二通孔以及第三通孔，从而实现第一侧壁、绝缘结构和连接构件之间铆接固定，加工过程简单，有利于提高电池单体的加工效率。
在一些实施例中，该连接构件还包括第三限位结构，该第三限位结构与该第二限位结构相互配合，以阻止该连接构件与该绝缘结构之间的相对移动。
第一限位结构、第二限位结构和第三限位结构可以相互配合，以阻止第一侧壁、绝缘结构和连接构件之间相对移动，可以固定该连接构件，以便于电池单体的组合安装，还可以保证绝缘结构将第一侧壁和连接构件电隔离，避免连接构件与第一侧壁之间发生短路。
在一些实施例中，该盖板为该电池单体的面积最大的壁，这样便于电池单体内部的部件的安装，例如，可以便于电极组件的安装，加快该电池单体的加工速度。
在一些实施例中，该盖板设置有泄压机构；或者，与该盖板相对设置的壁上设置有泄压机构，以在电池单体的内部压力或温度达到预定阈值时致动以泄放电池单体的内部压力或温度。
在一些实施例中，该泄压机构为设置于该电池单体的外表面的L型刻痕，即该泄压机构具有相互连接且相互垂直的两部分，这样，电池单体内部的温度或者压力达到预设阈值时，该泄压机构可以沿任一方向被破坏，以便于泄压机构及时被破坏，以及时泄放电池单体的内部的压力和温度，避免电池单体发生爆炸。另外，将泄压机构的设置在盖板的外表面，避免电池单体内部的电解液在刻痕内堆积，避免电解液对泄压机构的腐蚀，从而也可以提高泄压机构的安全性。
在一些实施例中，该壳体的材料包括不锈钢和/或合金；和/或，该盖板的材料包括不锈钢和/或合金。这样可以使得电池单体具有较强的硬度，保证该电池单体的结构强度。
在一些实施例中，该壳体的厚度的取值范围为[50μm，200μm]；和/或，该盖板的厚度的取值范围为[50μm，200μm]，以保证该电池单体的结构强度。
第二方面，提供了一种电池，包括：多个第一方面所述的电池单体。
第三方面，提供了一种用电设备，包括：第一方面所述的电池单体，所述电池单体用于为所述用电设备提供电能。
在一些实施例中，所述用电设备为车辆、船舶或航天器。
附图说明
图1是本申请一实施例公开的一种车辆的结构示意图；
图2是本申请一实施例公开的一种电池的分解结构示意图；
图3是本申请一实施例公开的一种电池单体的结构示意图；
图4是本申请一实施例公开的一种电池单体的分解结构示意图；
图5是本申请一实施例公开的一种电池单体的侧视局部示意图；
图6是本申请一实施例公开的另一种电池单体的结构示意图；
图7是本申请一实施例公开的再一种电池单体的结构示意图；
图8是本申请一实施例公开的再一种电池单体的侧视结构示意图；
图9是本申请一实施例公开的一种裁切前的电池单体的结构示意图；
图10是本申请一实施例公开的一种电池单体的局部截面示意图；
图11是本申请一实施例公开的一种电池单体的另一局部截面示意图；
图12是本申请一实施例公开的一种电池单体的局部截面分解示意图；
图13是本申请一实施例公开的一种电池单体的第一壁的外表面的示意图；
图14是本申请一实施例公开的一种盖板的表面的示意图；
图15是本申请一实施例公开的一种盖板的局部截面示意图。
在附图中，附图并未按照实际的比例绘制。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示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”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
下述描述中出现的方位词均为图中示出的方向，并不是对本申请的具体结构进行限定。在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。应理解，附图示出的本申请实施例中的各 种部件的厚度、长宽等尺寸，以及集成装置的整体厚度、长宽等尺寸仅为示例性说明，而不应对本申请构成任何限定。
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、方形电池单体和软包电池单体，本申请实施例对此也不限定。
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。
电池单体包括电极组件和电解液，电极组件由正极极片、负极极片和隔离膜组成。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂敷正极活性物质层的正极集流体凸出于已涂覆正极活性物质层的正极集流体，未涂敷正极活性物质层的正极集流体作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂敷负极活性物质层的负极集流体凸出于已涂覆负极活性物质层的负极集流体，未涂敷负极活性物质层的负极集流体作为负极极耳。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。隔离膜的材质可以为聚丙烯(polypropylene，PP)或聚乙烯(polyethylene，PE)等。此外，电极组件可以是卷绕式结构，也可以是叠片式结构，本申请实施例并不限于此。
电池技术的发展要同时考虑多方面的设计因素，例如，能量密度、循环寿命、放电容量、充放电倍率等性能参数，另外，还需要考虑电池的安全性和加工效率。电池单体通常包括具有开口的壳体和用于盖合该开口的盖板，其中，壳体与盖板之间可以通过焊接的方式密封连接。电池单体的壳体与盖板密封连接的区域通常凸出于盖板与壳体的外表面，并且凸出的部分高度较小；另外，电池单体上设置的电极端子等部件也可能凸出于壳体或者盖板的表面，那么在焊接壳体和盖板时，很可能对凸出的电极端子或者其他部件产生影响，例如，采用激光焊接的方式密封壳体和盖板时，可能与电极端子存在干涉，影响激光焊接操作性及优率，进而增加制造成本，甚至影响电池单体的密封性，进而影响电池单体的合格率和加工效率。
因此，本申请实施例提供了一种电池单体、电池和用电设备，电池单体的壳体和盖板密封连接并形成有围绕壳体的开口的连接结构。该连接结构包括与位于壳体的第一侧壁的电极端子对应的第一区域，并且，电极端子的凸出于第一侧壁的外表面的部分在连接结构的正投影不超出第一区域，即第一区域的范围大于或者等于该正投影的范围。这样，在对电池单体的壳体和盖板进行密封连接时，例如通过焊接的方式密 封时，可以沿着该第一区域的远离电池单体的内部的边缘进行焊接密封，由于第一区域的范围较大，所以不会受到或者很难受到相对较小的电极端子的影响，也很难对电极端子产生影响，从而可以提高密封效率，保证密封可靠性，提高电池单体的加工效率和安全性能。
以下实施例为了方便说明，以用电设备为车辆为例进行说明。
例如，如图1所示，为本申请一个实施例的一种车辆1的结构示意图，车辆1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1的内部可以设置马达40，控制器30以及电池10，控制器30用来控制电池10为马达40的供电。例如，在车辆1的底部或车头或车尾可以设置电池10。电池10可以用于车辆1的供电，例如，电池10可以作为车辆1的操作电源，用于车辆1的电路系统，例如，用于车辆1的启动、导航和运行时的工作用电需求。在本申请的另一实施例中，电池10不仅仅可以作为车辆1的操作电源，还可以作为车辆1的驱动电源，替代或部分地替代燃油或天然气为车辆1提供驱动动力。
为了满足不同的使用电力需求，电池可以包括多个电池单体，其中，多个电池单体之间可以串联或并联或混联，混联是指串联和并联的混合。电池也可以称为电池包。例如，多个电池单体可以先串联或并联或混联组成电池模块，多个电池模块再串联或并联或混联组成电池。也就是说，多个电池单体可以直接组成电池，也可以先组成电池模块，电池模块再组成电池。
例如，图2示出了本申请一个实施例的一种电池10的结构示意图，电池10可以包括多个电池单体20。电池10还可以包括箱体11，箱体11内部为中空结构，多个电池单体20容纳于箱体11内。图2示出了本申请实施例的箱体11的一种可能的实现方式，如图2所示，箱体11可以包括两部分，这里分别称为第一部分111和第二部分112，第一部分111和第二部分112扣合在一起。第一部分111和第二部分112的形状可以根据多个电池单体20组合后的形状而定，第一部分111和第二部分112中至少一个具有一个开口。例如，如图2所示，该第一部分111和第二部分112均可以为中空长方体且各自只有一个面为开口面，第一部分111的开口和第二部分112的开口相对设置，并且第一部分111和第二部分112相互扣合形成具有封闭腔室的箱体11。
再例如，不同于图2所示，第一部分111和第二部分112中可以仅有一个为具有开口的中空长方体，而另一个为板状，以盖合开口。例如，这里以第二部分112为中空长方体且只有一个面为开口面，第一部分111为板状为例，那么第一部分111盖合在第二部分112的开口处以形成具有封闭腔室的箱体11，该腔室可以用于容纳多个电池单体20。多个电池单体20相互并联或串联或混联组合后置于第一部分111和第二部分112扣合后形成的箱体11内。
在一些实施例中，电池10还可以包括其他结构，在此不再一一赘述。例如，该电池10还可以包括汇流部件，汇流部件用于实现多个电池单体20之间的电连接，例如并联或串联或混联。具体地，汇流部件可通过连接电池单体20的电极端子实现电池单体20之间的电连接。进一步地，汇流部件可通过焊接固定于电池单体20的电极端子。多个电池单体20的电能可进一步通过导电机构穿过箱体11而引出。
根据不同的电力需求，电池10中的电池单体20的数量可以设置为任意数值。多个电池单体20可通过串联、并联或混联的方式连接以实现较大的容量或功率。由于每个电池10中包括的电池单体20的数量可能较多，为了便于安装，可以将电池单体20分组设置，每组电池单体20组成电池模块。电池模块中包括的电池单体20的数量不限，可以根据需求设置。另外，为了提高电池10内电池单体20的空间占用率，可以根据多个电池单体20的形状合理设置电池单体20的安装方向；并且，电池10内不同电池单体20的安装方向可以相同或者不同，本申请实施例对此不做限定。
图3示出了本申请实施例的电池单体20的结构示意图；图4示出了本申请实施例的电池单体20的分解结构示意图，例如，图4可以为图3所示的电池单体20的分解结构示意图；图5示出了本申请实施例的电池单体20的一侧的局部结构示意图，例如，该图5为图3所示的电池单体20的壳体211的底壁一侧的局部示意图。
如图3至图5所示，壳体211，该壳体211为具有开口2111的中空结构，该壳体211的与该开口2111相邻的第一侧壁2112设置有电极端子214；盖板212，用于盖合该开口2111，该盖板212和该壳体211密封连接并形成有围绕该开口2111的连接结构216，该连接结构216包括与该电极端子214对应的第一区域2161，该电极端子214的凸出于该第一侧壁2112的外表面的部分在该连接结构216上的正投影不超出该第一区域2161。
应理解，本申请实施例的电池单体20包括外壳21，该外壳21可以为多面体的中空结构，该中空结构可以用于容纳电极组件。电池单体20的形状可以根据实际应用灵活设置，即该电池单体20可以为任意多面体结构，例如，可以设置为长方体或者圆柱体等。具体地，电池单体20可以包括外壳21，该外壳21包括多个壁，以使得该电池单体20为多面体结构。示例性的，如图3至图5所示，本申请实施例主要以外壳为长方体结构为例进行描述，对于长方体电池单体20，该外壳21可以包括六个壁。
具体地，对于长方形的电池单体20，为了便于描述，本申请实施例定义了三个参考方向。如图3至图5所示，该电池单体20的厚度方向为方向Y，该电池单体20的高度方向为方向Z，该电池单体20的宽度方向为方向X，其中，该电池单体20的厚度方向Y、高度方向Z和宽度方向X相互垂直。
本申请实施例的外壳21可以包括壳体211和盖板212。壳体211可以是一端或者多端形成开口2111的中空结构。例如，若壳体211为一端形成开口2111的空心结构，盖板212则可以设置为一个；若壳体211为相对的两端形成开口2111的空心结构，盖板212则可以设置为两个，两个盖板212分别盖合于壳体211两端的开口。
为了便于说明，如图3至图5所示，本申请实施例以该壳体211具有一个开口2111为例，对应的，盖板212用于盖合该开口2111。可选地，本申请实施例的盖板212盖合壳体211的开口2111，例如，可以通过焊接的方式，实现壳体211与盖板212之间的密封连接，以提高密封可靠性。
本申请实施例的壳体211与盖板212密封连接，即壳体211与盖板212围绕开口2111密封连接，从而形状围绕该开口2111的连接结构216。具体地，该连接结构216包括壳体211的围绕开口2111的边缘区域，以及与之对应的盖板211的外边缘区 域；并且，壳体211的边缘区域与盖板212的边缘区域接触并在至少部分区域内实现密封连接，从而形成凸出于盖板212的外表面和壳体211的外表面的连接结构216，其中，壳体211的外表面和盖板212的外表面均表示远离电池单体20的内部的表面。例如，该壳体211的第一侧壁2112的外表面为该第一侧壁2112的远离该电池单体20的内部的表面。
应理解，本申请实施例的连接结构216包括壳体211与盖板212接触的部分，但不仅限于实际密封区域。例如，当通过焊接等方式密封壳体211与盖板212时，实际焊接区域可以小于或者等于连接结构216的区域，即可以在连接结构216的至少部分区域内进行焊接。
壳体211的第一侧壁2112设置有电极端子214，连接结构216的第一区域2161为与该电极端子214对应的区域，即第一区域2161为靠近该电极端子214的且位于电极端子214周围的区域。
在本申请实施例中，电极端子214的凸出于第一侧壁2112的部分在连接结构216的正投影为该电极端子214的凸出于第一侧壁2112的部分沿该连接结构216的厚度方向的投影，或者说沿垂直该连接结构216的表面的方向的投影。例如，如图3至图5所示，若该连接结构216的厚度方向与电池单体20的厚度方向Y一致，则该电极端子214的凸出于第一侧壁2112的部分在连接结构216的正投影垂直于该电池单体20的厚度方向Y。
在本申请实施例中，该正投影不超出第一区域，即该正投影的范围小于或者等于第一区域的范围。这样，在对电池单体20的壳体211和盖板212进行密封连接时，例如通过焊接的方式密封时，可以沿着该第一区域2161的远离电池单体20的内部的边缘进行焊接密封，或者说沿着该第一区域2161的远离电极端子214的边缘进行焊接密封，由于第一区域2161的范围较大，所以不会受到或者很难受到范围相对较小的电极端子214的影响，也很难对电极端子214产生影响，从而可以提高密封效率，保证密封可靠性，提高电池单体20的加工效率和安全性能。
可选地，本申请实施例中电极端子214的凸出于该第一侧壁2112的外表面的部分在该连接结构216上的正投影不超出该第一区域2161可以包括多种情况。例如，该第一区域2161凸出于第一侧壁2112的外表面的高度H1大于该电极端子214凸出于该第一侧壁2112的外表面的高度H2。这样，在对电池单体20的壳体211和盖板212进行密封连接时，例如通过焊接的方式密封时，可以沿着该第一区域2161的远离电池单体20的内部的边缘进行焊接密封。由于第一区域2161的高度H1不等于电极端子214的高度H2，即第一区域2161的高度H1较大，则连接结构216的垂直于该第一区域2161的高度方向的外边缘与电极端子214的对应外边缘之间具有高度差，壳体211和盖板212在该区域的密封连接不会受到或者很难受到高度相对较小的电极端子214的影响，也很难对电极端子214产生影响，从而可以提高密封效率，保证密封可靠性，提高电池单体20的加工效率和安全性能。
应理解，本申请实施例中的第一区域2161的高度H1可以指：沿该第一区域2161的高度方向，该第一区域2161的不同区域的高度最小值。其中，该第一区域2161 的高度方向垂直于第一侧壁2112，即该第一区域2161的高度方向为第一侧壁2112的厚度方向。例如，如图3至图5所示，若该第一区域2161垂直于该第一侧壁，且第一侧壁2112的厚度方向为电池单体20的高度方向Z，则该第一区域2161的高度方向为该电池单体20的高度方向Z。另外，在该第一区域2161的高度方向，该第一区域2161的不同区域的高度可以设置为相等，以便于加工。
在本申请实施例中，第一区域2161凸出于第一侧壁2112的外表面的高度H1与电极端子214凸出于第一侧壁2112的外表面的高度H2之间的差值H的取值可以根据实际应用灵活设置。例如，如图3至图5所示，若该高度差值H设置过大，由于电极端子214凸出于第一侧壁2112的外表面的高度H2相对固定，因此第一区域2161凸出于第一侧壁2112的外表面的高度H1相对较大，这会导致电池单体20的局部高度过高，会影响电池10内部多个电池单体20之间的组装，降低电池10的空间利用率。相反的，若该高度差值H设置过小，即第一区域2161凸出于第一侧壁2112的外表面的高度H1与电极端子214凸出于第一侧壁2112的外表面的高度H2相近，那么即使在第一区域2161的远离电池单体20的内部的边缘密封连接壳体211和盖板212，还是容易受到电极端子214的影响，也就会影响密封可靠性，进而影响电池单体20的加工效率。
因此，该高度差值不宜设置过大或者过小。例如，第一区域2161凸出于第一侧壁2112的外表面的高度H1与电极端子214凸出于第一侧壁2112的外表面的高度H2的差值H的取值范围为[0.5mm，2mm]。再例如，该高度差值H可以具体设置为0.5mm、0.6mm、0.7mm、0.8mm、0.9mm、1mm、1.1mm、1.2mm、1.3mm、1.4mm、1.5mm、1.6mm、1.7mm、1.8mm、1.9mm或者2mm。
可选地，本申请实施例的第一区域2161的凸出于第一侧壁2112的外表面的高度H1的取值可以根据实际应用进行设置。例如，第一区域2161的凸出于第一侧壁2112的外表面的高度H1的取值范围通常可以设置为[1mm，7mm]。再例如，该第一区域2161的凸出于第一侧壁2112的外表面的高度H1可以具体设置为1mm、1.3mm、1.5mm、1.8mm、2mm、2.3mm、2.5mm、2.8mm、3mm、3.3mm、3.5mm、3.8mm、4mm、4.3mm、4.5mmm、4.8mm、5mm、5.3mm、5.5mmm、5.8mm、6mm、6.3mm、6.5mmm、6.8mm或者7mm。
可选地，本申请实施例的电极端子214凸出于第一侧壁2112的外表面的高度H2的取值可以根据实际应用进行设置。例如，电极端子214凸出于第一侧壁2112的外表面的高度H2的取值范围通常可以设置为[0.5mm，5mm]。再例如，电极端子214凸出于第一侧壁2112的外表面的高度H2可以具体设置为0.5mm、0.8mm、1mm、1.3mm、1.5mm、1.8mm、2mm、2.3mm、2.5mm、2.8mm、3mm、3.3mm、3.5mm、3.8mm、4mm、4.3mm、4.5mmm、4.8mm或者5mm。
可选地，在第一区域2161的长度方向上，第一区域2161的长度L1大于电极端子214的长度L2，长度方向分别垂直与第一区域2161的厚度方向和第一区域2161的凸出于第一侧壁2112的外表面的高度方向。除上述高度方向以外，第一区域2161的长度L1也可以设置为大于该电极端子214的长度L2，即第一区域2161的长度L1大于电极端子214的凸出于该第一侧壁2112的外表面的部分在连接结构216的正投影的长度。这样，在对电池单体20的壳体211和盖板212进行密封连接时，例如通过焊接的方式 密封时，可以沿着该第一区域2161的远离电池单体20的内部的边缘进行焊接密封。由于第一区域2161的长度L1不等于电极端子214的长度L2，即第一区域2161的长度L1较大，则连接结构216的垂直于该第一区域2161的长度方向的外边缘与电极端子214的对应外边缘之间具有长度差，壳体211和盖板212在该区域的密封连接不会受到或者很难受到高度相对较小的电极端子214的影响，也很难对电极端子214产生影响，从而可以提高密封效率，保证密封可靠性，提高电池单体20的加工效率和安全性能。
应理解，该第一区域2161的长度方向垂直于该第一区域2161的厚度方向，并且也垂直于第一区域2161的凸出于第一侧壁2112的外表面的高度方向。例如，如图3至图5所示，若该连接结构216垂直于壳体211的第一侧壁2112，则该连接结构216的第一区域2161的厚度方向即为该电池单体20的厚度方向Y，该第一区域2161的高度方向即为该电池单体20的高度方向Z，对应的，该第一区域2161的长度为该电池单体20的宽度方向X，但本申请实施例并不限于此。
另外，该第一区域2161的长度L1可以指：沿该第一区域2161的长度方向，该第一区域2161的不同区域的长度的最小值。例如，如图3至图5所示，在该第一区域2161的长度方向，该第一区域2161的不同区域的长度可以设置为相等，例如，该第一区域2161可以设置为矩形，以便于加工。
可选地，在第一区域2161的长度方向上，第一区域2161的长度L1与电极端子214的长度L2的差值的取值范围可以根据实际应用进行设置；并且，在沿该第一区域2161的长度方向上的两端，第一区域2161与电极端子214之间的长度的差值可以相等或者不相等。例如，以其中一端为例，即如图3至图5所示，在第一区域2161的长度方向上，第一区域2161的边缘与对应的正投影的最小距离L的取值范围可以根据实际应用进行设置。若该距离L设置过大，由于电极端子214的长度L2相对固定，则该第一区域2161的长度L1过大，这会导致凸出的第一区域2161占用空间较大，很可能影响电池10内部多个电池单体20之间的组装，降低电池10的空间利用率。相反地，若该距离L设置过小，则电极端子214的边缘与第一区域2161的边缘之间的距离较小，那么即使在第一区域2161的远离电极端子214的外边缘密封连接壳体211和盖板212，还是容易受到电极端子214的影响，也就会影响密封可靠性，进而影响电池单体20的加工效率。
因此，距离L的取值不宜过大或者过小。例如，在第一区域2161的长度方向上，第一区域2161的边缘与正投影的最小距离L的取值范围为[0.5mm，5mm]。再例如，该距离L可以具体设置为0.5mm、0.8mm、1mm、1.3mm、1.5mm、1.8mm、2mm、2.3mm、2.5mm、2.8mm、3mm、3.3mm、3.5mm、3.8mm、4mm、4.3mm、4.5mm、4.8mm或者5mm。
可选地，在第一区域2161的长度方向上，第一区域2161的长度L1的取值可以根据实际应用进行设置。例如，第一区域2161的长度L1的取值范围可以设置为[2.5mm，25mm]。再例如，第一区域2161的长度L1可以具体设置为2.5mm、3mm、4mm、5mm、6mm、7mm、8mm、9mm、10mm、11mm、12mm、13mm、14mm、15mm、16mm、17mm、18mm、19mm、20mm、21mm、22mm、23mm、24mm或者25mm。
可选地，在第一区域2161的长度方向上，电极端子214的长度L2的取值可以 根据实际应用进行设置。例如，电极端子214的长度L2的取值范围可以设置为[2mm，20mm]。再例如，电极端子214的长度L2可以具体设置为2mm、3mm、4mm、5mm、6mm、7mm、8mm、9mm、10mm、11mm、12mm、13mm、14mm、15mm、16mm、17mm、18mm、19mm或者20mm。
应理解，本申请实施例中的第一侧壁2112设置有电极端子214，该电极端子214可以为电池单体20包括的任意一个电极端子214。具体地，电极端子214用于与电池单体20内部的电极组件电连接，以输出电池单体20的电能。如图3至图5所示，电池单体20可以包括至少两个电极端子214，该至少两个电极端子214可以包括至少一个正极电极端子214a和至少一个负极电极端子214b，正极电极端子214a用于与电极组件的正极极耳电连接，负极电极端子214b用于与电极组件的负极极耳电连接。正极电极端子214a与正极极耳可以直接连接，也可以间接连接，负极电极端子214b与负极极耳可以直接连接，也可以间接连接。示例性的，正极电极端子214a通过一个连接构件23与正极极耳222a电连接，负极电极端子214b通过一个连接构件23与负极极耳222b电连接。
应理解，不同电极端子214可以位于电池单体20的同一个壁或者不同的壁。例如，如图3至图5所示，本申请实施例以电池单体20包括两个电极端子214，且该两个电极端子214位于同一个壁为例，例如，可以均位于第一侧壁2112上。再例如，与如图3至图5所示不同的，壳体211具有多个第一侧壁2112，该多个第一侧壁2112中每个第一侧壁2112均设置有至少一个电极端子214，并且连接结构216具有多个第一区域2161，以使每个第一侧壁2112上设置的电极端子214具有至少一个对应的第一区域2161。为了便于说明，本申请实施例以电池单体20包括一个第一侧壁2112为例，而电池单体20包括多个第一侧壁2112时，每个第一侧壁2112均适用相关描述。
可选地，本申请实施例的电池单体20的第一侧壁2112可以包括多个电极端子214，而该连接结构216可以包括至少一个第一区域2161。例如，若该电池单体20的第一侧壁2112包括多个电极端子214，可以设置该多个电极端子214中的部分电极端子214具有对应的第一区域2161。具体地，如图3至图5所示，考虑到正极电极端子214a的高度通常大于负极电极端子214b的高度，即正极电极端子214a凸出于第一侧壁2112的外表面的部分容易影响壳体211与盖板212之间的密封连接，所以该第一侧壁2112包括至少一个正极电极端子214a和至少一个负极电极端子214b时，可以仅设置该至少一个正极电极端子214a与至少一个第一区域2161一一对应，而不设置第一区域2161与负极电极端子214b对应，即本申请实施例的电极端子214为正极电极端子214a，以避免正极电极端子214a对壳体211与盖板212之间的密封连接的影响。
可选地，作为另一个实施例，图6示出了本申请实施例的电池单体20的另一结构示意图。如图6所示，第一侧壁2112设置有多个电极端子214，连接结构216包括与多个电极端子214一一对应的多个第一区域2161。具体地，设置多个电极端子214与多个第一区域2161一一对应，可以避免每个电极端子214对壳体与盖板212之间的密封连接的影响；并且，由于不需要区分哪些电极端子214设置有对应的第一区域2161以及哪些电极端子214未设置有对应的第一区域2161，可以提高加工效率和电池 单体20的组装效率。
可选地，作为另一个实施例，图7示出了本申请实施例的电池单体20的再一结构示意图，图8示出了本申请实施例的电池单体20的侧视示意图，例如，图8可以为图7所示的电池单体20的壳体211的远离盖板211的一侧的示意图。如图7和图8所示，连接结构216包括与第一侧壁2112对应的第二区域2162，第二区域2162凸出于第一侧壁2112的外表面的高度H3大于电极端子214凸出于第一侧壁2112的外表面的高度H2，第二区域2162包括第一区域2161。具体地，该第二区域2162为与第一侧壁2112对应的区域，即该第二区域2162为连接结构216的与该第一侧壁2112连接的区域。将该第二区域2162的凸出于第一侧壁2112的高度H3设置为大于电极端子214凸出于第一侧壁2112的外表面的高度H2，即不需要单独设置局部凸出的第一区域2161，而设置与第一侧壁2112对应的第二区域2162均高于电极端子214的高度H2，即第二区域2162包括上文中的第一区域2161。这样，在对电池单体20的壳体211和盖板212进行密封连接时，例如通过焊接的方式密封时，对于第一侧壁2112对应的区域，可以沿着该第二区域2162的远离电池单体20的内部的外边缘进行焊接密封，由于第二区域2162的高度H3较大，所以不会受到或者很难受到高度相对较小的电极端子214的影响，也很难对电极端子214产生影响，从而可以提高密封效率，保证密封可靠性，提高电池单体20的加工效率和安全性能。
应理解，本申请实施例中第二区域2162的高度H3可以指：沿该第二区域2162的高度方向，该第二区域2162的不同区域的高度最小值。例如，如图7和图8所示，为了便于加工以及提高加工效率，可以设置该第二区域2162的不同区域的高度H3相同，但本申请实施例并不限于此。
在本申请实施例中，与第一侧壁2112不同地，电池单体20还可以包括未设置有电极端子214的壁。具体地，壳体211包括与开口2111相邻的第二侧壁2113，第二侧壁2113未设置有电极端子214，连接结构216包括与第二侧壁2113对应的第三区域2163，第三区域2163凸出于第二侧壁2113的外表面的高度不等于第一区域2161凸出于第一侧壁2112的外表面的高度。其中，本申请实施例的第二侧壁2113的外表面为第二侧壁2113的远离电池单体20的内部的表面。由于第二侧壁2113并未设置有电极端子214，因此，可以设置该第二侧壁2113对应的第三区域2163的凸出高度不等于第一区域2161凸出于第一侧壁2112的外表面的高度H1，即该电池单体20的连接结构216的不同区域可以具有不同的高度。这样，该第三区域2163的设置无需考虑电极端子214的影响，例如，若该第三区域2163无需避让其他部件，则可以减小该第三区域2163的凸出于第二侧壁2113的外表面的高度，以减小该第三区域2163占用的空间；相反的，若该第三区域2163还需要避让其他部件，则可以适当增加或者减小该第三区域2163的凸出于第二侧壁2113的外表面的高度，以避免其他部件对连接结构216的影响，进而提高壳体211和盖板212之间的密封可靠性。
可选地，第三区域2163凸出于第二侧壁2113的外表面的高度小于第一区域2161凸出于第一侧壁2112的外表面的高度。考虑到壳体211的侧壁上除电极端子214以外，通常不会设置其他高度较高的部件，或者对壳体211和盖板212之间的密封连接 具有影响的部件，因此，可以设置壳体211的未设置电极端子214的侧壁的高度较小。
具体地，该电池单体20可以具有至少一个未设置电极端子214的壁，即该电池单体20可以具有至少一个第二侧壁2113。例如，图7和图8以该电池单体20包括一个第一侧壁2112和三个第二侧壁2113为例，即该连接结构216包括与第一侧壁2112对应的第二区域2162，以及与三个第二侧壁2113对应的三个第三区域2163。如图7和图8所示，连接结构216的第二区域2162凸出于第一侧壁2112的外表面的高度为H3；连接结构216的左侧的第三区域2163凸出于对应的第二侧壁2113的高度为H4；连接结构216的下方的第三区域2163凸出于对应的第二侧壁2113的高度为H5；连接结构216的右侧的第三区域2163凸出于对应的第二侧壁2113的高度为H5。高度H3至高度H6均可以根据实际应用进行设置，并且可以设置部分高度相等或者全部高度均不相等。例如，可以设置H3至高度H6全部不相等，以适应壳体211的不同的侧壁；再例如，可以设置高度H4等于高度H6，但高度H3、高度H4和高度H5均不相等，以使得该连接结构216为对称结构，以便于加工；再例如，还可以设置高度H4至高度H6均相等，但与高度H3不同，且均小于高度H3，以提高电池单体20的加工效率，并且可以减小连接结构216的空间占用率，提高电池10的能量密度。
可选地，本申请实施例的上述各个电池单体20的不同的连接结构216，可以通过裁切的方式获得。例如，图9示出了本申请实施例的裁切之前的电池单体20的结构示意图。如图9所示，在电池单体20未裁切之前，即将盖板212与壳体211贴合，但未将该壳体211与盖板212进行密封之前，可以设置该壳体211与盖板212的连接结构216凸出于壳体211的侧壁的高度较大；之后，可以对如图9所示的电池单体20进行裁切，即对连接结构216进行裁切，从而获得如图3至图8所示的不同的电池单体20的连接结构216，再沿着该连接结构216的远离电池单体20的外边缘进行密封连接，例如通过焊接的方式密封，从而密封壳体211和盖板212，以获得加工后的电池单体20。
可选地，本申请实施例的外壳21还可以设置有其他部件。例如，外壳21还可以设置有注液孔2151以及用于密封该注液孔2151的密封组件215。例如，如图3至图9所示，电池单体20的第一侧壁2112或者第二侧壁2113可以设置有注液孔2151以及用于密封该注液孔2151的密封组件215，该注液孔2151用于向电池单体20内部注入电解液，密封组件215密封该注液孔2151，例如，可以通过激光焊接的方式密封，以提高密封可靠性。
上文中结合附图对本申请实施例的连接结构216进行了描述，下面将结合附图，对本申请实施例的电池单体20的其他部分进行描述。
图10示出了本申请实施例的电池单体20的局部截面示意图，具体地，图10可以为该电池单体20的壳体211的局部截面示意图，其中，该截面垂直于该电池单体20的厚度方向Y；该图10所示的电池单体20可以为如图3至图9中任意一个电池单体20。图11示出了本申请实施例的电池单体20的局部截面放大示意图，例如，该图11为图10所示的区域A的放大图；图12示出了本申请实施例的电池单体20的局部截面分解示意图，例如，该图12为图11所示的局部电池单体20的分解结构示意图。
如图10至图12所示，电池单体20还包括：绝缘结构22，绝缘结构22设置在 第一侧壁2112的朝向电池单体20的内部的一侧，第一侧壁2112设置有第一通孔2101，绝缘结构22设置有与第一通孔2101对应的第二通孔221，电极端子214贯穿第一通孔2101和第二通孔221，以使第一侧壁2112和绝缘结构22铆接。
本申请实施例的绝缘结构22设置在第一侧壁2112的朝向电池单体20的内部的一侧，即该绝缘结构22与第一侧壁2112沿第一侧壁2112的厚度方向层叠设置。并且，该绝缘结构22的具体形状可以根据实际应用进行设置，例如，该绝缘结构22可以为板状，以与第一侧壁2112贴合，使得该第一侧壁2112与电池单体20的内部的部件电隔离，例如，该绝缘结构22可以用于使得第一侧壁2112与电池单体20的内部的电极组件电隔离，以避免短路。
可选地，本申请实施例的电极端子214的设置方式可以根据实际应用灵活选择。例如，第一侧壁2112设置有第一通孔2101，绝缘结构22设置有与第一通孔2101对应的第二通孔221，电极端子214贯穿第一通孔2101和第二通孔221，以使第一侧壁2112和绝缘结构22铆接，这样便于加工和实现电极端子214、第一侧壁2112和绝缘结构22之间的固定。
应理解，由于电池单体20的外壳21通常为金属材质，若电极端子214与第一侧壁2112直接接触，则可能发生短路。因此，电极端子214与第一侧壁2112之间可以设置有绝缘部件，以避免短路。具体地，电池单体20还包括：密封结构24，设置在第一侧壁2112的远离电池单体20的内部的一侧，密封结构24用于电隔离电极端子214与第一侧壁2112。该密封结构24通常采用绝缘材料，将密封结构24设置在第一侧壁2112和电极端子214之间，可以避免电极端子214与第一侧壁2112之间发生短路。
可选地，密封结构24设置有第五通孔241，第五通孔241的至少部分容纳在第一通孔2101内，电极端子214贯穿第五通孔241，以使电极端子214与第一通孔2101之间密封。
该密封结构24上设置有第五通孔241，形成该第五通孔241的孔壁的至少部分位于第一通孔2101，或者进一步地，该第五通孔241的孔壁的至少部分还可以位于第二通孔221内，以使该电极端子214贯穿该第五通孔241的情况下，该电极端子214与第一通孔2101之间设置有密封结构24的部分，可以避免短路；或者进一步地，该电极端子214与第二通孔221之间也可以设置有密封结构24的部分。这样，由于第一侧壁2112设置有第一通孔2101，且绝缘结构22设置有第二通孔221，则电极端子214与第一通孔2101之间以及电极端子214与第二通孔221之间都可能存在空隙，所以可以通过该密封结构24密封第一通孔2101和第二通孔221，例如，可以在铆接挤压的过程中，密封结构24被挤压变形进而密封，以避免内部电解液泄漏。
应理解，本申请实施例的电极端子214依次贯穿密封结构24、第一侧壁2112和绝缘结构22，但是，电极端子214的铆接作用能够限制第一侧壁2112与绝缘结构22之间的相对平移，却不能阻止第一侧壁2112与绝缘结构22之间的相对转动，所以可以通过设置限位结构，以进一步限制第一侧壁2112与绝缘结构22之间的错位。具体地，第一侧壁2112设置有第一限位结构201，绝缘结构22设置有与第一限位结构201对应的第二限位结构202，第二限位结构202和第一限位结构201相互配合，以阻止绝缘结 构22与第一侧壁2112之间的相对移动。这样，一方面能够对第一侧壁2112和绝缘结构22进行定位，以便于二者之间的安装；另一方面还能够避免第一侧壁2112和绝缘结构22之间发生错位，例如，可以避免第一侧壁2112和绝缘结构22之间相对平移，也就保证了绝缘结构22对该第一侧壁2112与电池单体20内部其他部件之间的绝缘性能，避免短路，并提高电池单体20的安全性能。
应理解，本申请实施例中第一限位结构201和第二限位结构202的配合方式可以根据实际应用灵活设置。下面将结合附图，进行举例说明。
可选地，作为一个实施例，第一限位结构201包括相对第一侧壁2112朝向绝缘结构22凸起的第一凸起结构，第二限位结构202包括开口朝向第一侧壁2112的第一凹槽结构，第一凸起结构的至少部分容纳于第一凹槽结构内。具体地，如图10至图12所示，第一侧壁2112的朝向绝缘结构22的表面设置有朝向该绝缘结构22凸起的第一凸起结构，与之对应的，绝缘结构22的朝向第一侧壁2112的表面设置有第一凹槽结构，该第一凹槽结构的开口朝向第一侧壁2112。并且，第一限位结构201包括第一凸起结构，第二限位结构202包括第一凹槽结构，则第一限位结构201和第二限位结构202相互配合可以包括该第一凸起结构的至少部分容纳于该第一凹槽结构内，以使得第一凹槽结构可以限制该第一凸起结构的移动，进而限制第一侧壁2112相对于绝缘结构22的移动，以达到定位和固定的作用，避免第一侧壁2112和绝缘结构22之间发生错位；并且，上述设置方式简单，结构稳定，便于加工。
可选地，作为另一个实施例，第一限位结构201包括开口朝向绝缘结构22的第二凹槽结构，第二限位结构202包括相对绝缘结构22朝向第一侧壁2112凸起的第二凸起结构，第二凸起结构的至少部分容纳于第二凹槽结构内。具体地，与图10至图12所示的设置方向相反地，该第一侧壁2112的朝向绝缘结构22的表面设置有第二凹槽结构，该第二凹槽结构的开口朝向该绝缘结构22；对应的，绝缘结构22的朝向第一侧壁2112的表面设置有朝向第一侧壁2112凸起的第二凸起结构。该第一限位结构201可以包括该第二凹槽结构，该第二限位结构202可以包括第二凸起结构，则第一限位结构201和第二限位结构202相互配合可以包括该第二凸起结构的至少部分容纳于该第二凹槽结构内，以使得第二凹槽结构可以限制该第二凸起结构的移动，进而限制绝缘结构22相对于第一侧壁2112的移动，以达到定位和固定的作用，避免第一侧壁2112和绝缘结构22之间发生错位；并且，上述设置方式简单，结构稳定，便于加工。
可选地，本申请实施例的第一限位结构201可以包括至少一个第一凸起结构和/或至少一个第二凹槽结构，与之相对应的，第二限位结构202可以包括至少一个第一凹槽结构和/或至少一个第二凸起结构，本申请实施例并不限于此。例如，为了节省第一限位结构201占用第一侧壁2112的空间，以及第二限位结构202占用绝缘结构22的空间，该第一限位结构201可以包括设置于第一侧壁2112的一个第一凸起结构或者一个第二凹槽结构，与之相对应的，该第二限位结构202可以包括设置于绝缘结构22的一个第一凹槽结构或者一个第二凸起结构，以便于加工。
可选地，本申请实施例的第一凸起结构、第一凹槽结构、第二凸起结构和第二凹槽结构的设置方式可以根据实际应用灵活选择，以提高电池单体20的加工效率。
例如，对于第一凸起结构和第二凸起结构，可以通过凹槽的方式实现。第一凸起结构为第一侧壁2112的朝向绝缘结构22凹陷且凸出于第一侧壁2112的内表面的凹槽；和/或，第二凸起结构为绝缘结构22的朝向第一侧壁2112凹陷且凸出于绝缘结构22的外表面的凹槽。具体地，如图10至图12所示，第一侧壁2112朝向绝缘结构22凹陷以形成凹槽，该凹槽的底壁凸出于第一侧壁2112的内表面，该第一侧壁2112的内表面为朝向电池单体20内部的表面，进而可以将该凹槽用作第一凸起结构。类似地，与图10至图12所示的设置方向相反，绝缘结构22朝向第一侧壁2112凹陷以形成凹槽，该凹槽的底壁凸出于绝缘结构22的外表面，该绝缘结构22的外表面为远离电池单体20内部的表面，进而可以将该凹槽用作第二凸起结构。通过凹槽的方式设置第一凸起结构和/或第二凸起结构，相比于直接在第一侧壁2112的表面或者绝缘结构22的表面设置实心的凸起结构的方式，可以有效降低第一侧壁2112和/或绝缘结构22的重量，且加工方式简单，例如，可以通过冲压的方式，同步加工第一凸起结构和第一凹槽结构，或者，可以通过冲压的方式，同步加工第二凸起结构和第二凹槽结构，提高了电池单体20的加工效率。
可选地，第一凹槽结构和第二凹槽结构也可以分别参照第一凸起结构和第二凸起结构进行设置。第一凹槽结构凸出于绝缘结构22的内表面；和/或，第二凹槽结构凸出于第一侧壁2112的外表面。绝缘结构22的第一凹槽结构设置为凸出于该绝缘结构22的内表面，其中，该绝缘结构22的内表面为朝向电池单体20的内部的表面，则该第一凹槽结构的深度受到绝缘结构22的厚度限制较小，那么虽然绝缘结构22的厚度有限，但该第一凹槽结构的深度可能大于绝缘结构22的厚度，使得第一凸起结构能够更多的容纳于该第一凹槽结构内，以增加第一凸起结构和第一凹槽结构之间的稳定性，也就增加了第一限位结构201和第二限位结构202之间的稳定性。类似地，第一侧壁2112的第二凹槽结构设置为凸出于第一侧壁2112的外表面，其中，该第一侧壁2112的外表面为远离电池单体20的内部的表面，则该第二凹槽结构的深度受到第一侧壁2112的厚度限制较小，那么虽然第一侧壁2112的厚度有限，但该第二凹槽结构的深度可能大于第一侧壁2112的厚度，使得第二凸起结构能够更多的容纳于该第二凹槽结构内，以增加第二凸起结构和第二凹槽结构之间的稳定性，也就增加了第一限位结构201和第二限位结构202之间的稳定性。
应理解，若第一凸起结构和第二凸起结构为凹槽，则凹槽的底壁的厚度可以小于或者等于或者略大于该凹槽所在的第一侧壁2112的厚度或者所在的绝缘结构22的厚度。或者，与之不同的，该第一凸起结构还可以为第一侧壁2112上的厚度较大的凸块，例如，该第一凸起结构的厚度大于所在的第一侧壁2112的其他区域的厚度，以使该第一凸起结构凸出于该第一侧壁2112的朝向绝缘结构22表面。类似的，该第二凸起结构也可以为绝缘结构22上的厚度较大的凸块，例如，该第二凸起结构的厚度大于所在的绝缘结构22的其他区域的厚度，以使该第二凸起结构凸出于绝缘结构22的朝向第一侧壁2112表面。
可选地，对于第一凸起结构为厚度较大的凸块的情况，该第一凸起结构可以与第一侧壁2112一体，例如，可以通过冲压、铣削等方式在该第一侧壁2112上形成第一 凸起结构；或者，该第一凸起结构也可以和第一侧壁2112分体形成，例如第一侧壁2112形成有通孔，第一凸起结构安装于该通孔，安装方式可以包括焊接、铆接、卡接等，本申请对此不做特殊限制。与第一凸起结构类似地，对于第二凸起结构为厚度较大的凸块的情况，该第二凸起结构也可以与绝缘结构22一体或者分体形成，本申请对此不做特殊限制。
可选地，电池单体20还包括：连接构件23，用于与电极端子214电连接，连接构件23设置在绝缘结构22的朝向电池单体20的内部的一侧，连接构件23设置有与第二通孔221对应的第三通孔231，电极端子214贯穿第三通孔231，以使连接构件23、绝缘结构22和第一侧壁2112铆接。具体地，如图10至图12所示，本申请实施例的连接构件23可以用于与电极端子214电连接，还可以用于与电极组件的极耳电连接，以使得电极端子214与极耳电连接。连接构件23设置有第三通孔231，将第一侧壁2112的第一通孔2101、绝缘结构22的第二通孔221以及连接构件23的第三通孔231依次堆叠设置，以使得该电极端子214可以依次贯穿该第一通孔2101、第二通孔221以及第三通孔231，从而实现第一侧壁2112、绝缘结构22和连接构件23之间铆接固定，加工过程简单，有利于提高电池单体20的加工效率。
可选地，还可以将电极端子214与连接构件23之间通过焊接的方式连接，以进一步增加电极端子214与连接构件23之间的连接稳定性，保证电池单体20的性能。
可选地，连接构件23还包括第三限位结构232，第三限位结构232与第二限位结构202相互配合，以阻止连接构件23与绝缘结构22之间的相对移动。具体地，该连接构件23的第三限位机构232可以与第二限位结构202相互配合，即第一限位结构201、第二限位结构202和第三限位结构232可以相互配合，以阻止第一侧壁2112、绝缘结构22和连接构件23之间相对移动，可以固定该连接构件23，以便于电池单体20的组合安装，还可以保证绝缘结构22将第一侧壁2112和连接构件23电隔离，避免连接构件23与第一侧壁2112之间发生短路。
可选地，该第三限位结构232的设置方式可以根据实际应用灵活设置，例如，可以根据第一限位结构201和第二限位结构202的设置方式，对应设置该第三限位结构232。例如，若第一限位结构201包括第一凸起结构，第二限位结构202包括第一凹槽结构，该第一凹槽可以朝向连接构件23凸出于绝缘结果22的表面，对应的，该第三限位结构232则可以包括设置在该连接构件23的开口朝向绝缘结构22的凹槽或者通孔，以用于容纳该第一凹槽结构的至少部分，以实现第三限位结构232与第二限位结构202之间的相互配合。
以如图10至图12所示为例，与第一限位结构201与第二限位结构202对应的，第三限位结构232包括连接构件23的第四通孔，第四通孔用于容纳第二限位结构202的至少部分。具体地，第一限位结构201可以包括第一侧壁2112的第一凸起结构，第二限位结构202可以包括绝缘结构22的第一凹槽结构，且该第一凹槽结构凸出于该绝缘结构22的朝向电池单体20的内部的表面，则该第一凹槽结构能够容纳至少部分第一凸起结构的情况下，该第三限位结构232可以包括第四通孔，以用于容纳至少部分第一凹槽结构。这样，相比于将第三限位结构232设置为凹槽的情况，第四通孔可以节 省凹槽的底壁占用的空间，提高该电池单体20内部的空间利用率，还可以减轻该连接构件23的重量，也就可以减轻该电池单体20的重量，从而提高电池单体20的性能。另外，该第四通孔的内壁与第一凸起结构之间设置有绝缘结构22的第一凹槽结构，还可以避免连接构件23与第一侧壁2112发生短路。
再例如，若第一限位结构201包括第二凹槽结构，第二限位结构202包括第二凸起结构，该第二凸起结构为设置在绝缘结构22上的凹槽，则该第三限位结构232可以包括向绝缘结构22凸起的第三凸起结构，该第三凸起结构至少部分容纳于第二凸起结构内，以实现第三限位结构232与第二限位结构202之间的相互配合。
应理解，本申请实施例的第一限位结构201和第二限位结构202的设置位置和尺寸可以根据实际应用灵活设置。例如，可以根据第一侧壁2112的尺寸设置该第一限位结构201的尺寸和位置，而第二限位结构202的尺寸和位置与第一限位结构202的尺寸和位置相关，以使该第一限位结构201与第二限位结构202能够相互配合。下面以第一侧壁2112与第一限位结构201为例进行说明。
图13示出了本申请实施例的电池单体20的第一侧壁2112的外表面的示意图，该第一侧壁2112的外表面为该第一侧壁2112的远离电池单体20内部的表面。如图13所示，沿该第一侧壁2112的长度方向X，该电极端子214与该第一限位结构201之间的距离L1与该第一侧壁2112的长度L2的比值L1/L2的取值范围为[10％，48％]。若L1/L2的值设置过大，则在该第一侧壁2112的长度方向X上，该第一限位结构201与该电极端子214之间的距离L1过大，而第一限位结构201距离电极端子214太远会导致电极端子214的安装过程中，该第一限位结构201不能有效限制第一侧壁2112与绝缘结构22之间的相对移动，进而会影响电池单体20的加工效率。相反地，若L1/L2的值设置过小，则第一限位结构201与电极端子214的距离L1会过小，第一限位结构201距离电极端子214太近则很可能影响电极端子214的安装。例如，第一侧壁2112设置有用于容纳至少部分电极端子214的第一通孔2101，第一限位结构201与电极端子214的距离L1过小，则该第一限位结构201距离该第一通孔2101的距离也会过小，二者之间很可能会相互影响，进而影响第一侧壁2112的结构强度和稳定性，进而降低电池单体20的安装效率以及提高加工难度。
因此，L1/L2的取值不宜设置过大或者过小。例如，L1/L2的取值范围可以为[10％，48％]；或者也可以为[20％，40％]；或者，L1/L2的取值可以设置为10％、15％、20％、25％、30％、35％、40％、或者45％。
应理解，如图13所示，本申请实施例中电极端子214与该第一限位结构201之间的距离L1也可以表示：沿第一侧壁2112的长度方向X，电极端子214的中心与第一限位结构201的中心之间的距离。另外，电极端子214与该第一限位结构201之间的距离L1中电极端子214可以表示该第一侧壁2112上的任意一个电极端子214。例如，L1可以为第一限位结构201与距离该第一限位结构201最近的一个电极端子214之间的距离，如图13所示，若距离第一限位结构201最近的一个电极端子214为正极电极端子214a，则L1为第一限位结构201与该正极电极端子214a之间的距离，但本申请实施例并不限于此。
可选地，沿该第一侧壁2112的宽度方向Y，该第一限位结构201的尺寸W1与该第一侧壁2112的宽度W2的比值W1/W2的取值范围为[15％，95％]。若W1/W2的取值过大，则在该第一侧壁2112的宽度方向Y上，第一限位结构201的尺寸W1过大，会增加该第一限位结构201的加工难度，并且该第一限位结构201很可能影响与该第一侧壁2112相交的其他壁。相反地，若W1/W2的取值过小，则在该第一侧壁2112的宽度方向Y上，第一限位结构201的尺寸W1过小，由于第一侧壁2112的宽度W2有限，较小尺寸的第一限位结构201会增加该第一限位结构201的加工难度，并也很难通过尺寸过小的该第一限位结构201限制第一侧壁2112与绝缘结构22之间的相对移动。
因此，W1/W2的值不宜设置过大或者过小。例如，W1/W2的取值范围可以为[15％，95％]；或者也可以为[20％，40％]；或者，W1/W2的取值可以设置为15％、20％、25％、30％、35％、40％、45％、50％、55％、60％、65％、70％、75％、80％、85％、90％或者95％。
应理解，本申请实施例的第一侧壁2112的长度方向X垂直于宽度方向Y，且该第一侧壁2112的长度L2表示该第一侧壁2112的长度方向X的尺寸，该第一侧壁2112的宽度W2表示该第一侧壁2112的宽度方向Y的尺寸，该第一侧壁2112的长度L2大于该第一侧壁2112的宽度W2。
图14示出了本申请实施例的盖板212的外表面的示意图，其中，该盖板212的外表面为远离电池单体20的内部的表面；该图13所示的盖板212可以为如图7和图8所示的电池单体20的盖板212，但相关描述同样适用于如图3至图6所示的电池单体20的盖板212，为了简洁，在此不再赘述。图15示出了本申请实施例的盖板212的局部截面示意图，例如，该截面示意图可以为沿图14所示的B-B’方向的截面的局部示意图。
可选地，本申请实施例的壳体211可以是多种形状，比如，圆柱体、长方体或者其他多面体。示例性的，在本申请实施例中，主要以壳体211为长方体结构为例进行描述。对应地，本申请实施例的盖板212用于盖合于壳体211的开口2111，以将电池单体20的内部环境与外部环境隔绝的部件。盖板212的形状可以与壳体211的形状相适配，例如，如图14至图15所示，壳体211为长方体结构，盖板212为与壳体211相适配的矩形板状结构。
在该电池单体20中，壳体211与盖板212形成的内部空间可以用于容纳电极端子，该电极组件是电池单体20中发生电化学反应的部件。具体地，电极组件可以包括极耳和电极主体部，其中，电极组件的极耳可以包括正极极耳和负极极耳，正极极耳可以由正极极片上未涂覆正极活性物质层的部分层叠形成，负极极耳可以由负极极片上未涂覆负极活性物质层的部分层叠形成，电极主体部可以由正极极片上涂覆有正极活性物质层的部分和负极极片上涂覆有负极活性物质层的部分层叠形成或者卷绕形成。
应理解，根据实际使用需求，壳体211内的电极组件可设置为一个，也可以是多个。电极组件可以是圆柱体、长方体等，若电极组件为圆柱体结构，壳体211也可以为圆柱体结构，若电极组件为长方体结构，壳体211也可以为长方体结构。
可选地，本申请实施例的该盖板212可以为电池单体20的任意一个壁，例如，盖板212为电池单体20的面积最大的壁，这样便于电池单体20内部的部件的安装，例 如，可以便于电极组件的安装，加快该电池单体20的加工速度。
可选地，本申请实施例的外壳21的材质可以根据实际应用灵活设置，并且，盖板212的材质与壳体211的材质可以相同，也可以不同。例如，壳体211的材料包括不锈钢和/或合金；和/或，盖板212的材料包括不锈钢和/或合金，以使该壳体211和盖板212具有较强的硬度，保证该电池单体20的结构强度。再例如，在本申请实施例中，壳体211的材质可以是多种，比如，铜、铁、铝、钢、铝合金等。盖板212的材质也可以是多种，比如，铜、铁、铝、钢、铝合金等。
可选地，本申请实施例的外壳21的厚度可以根据实际应用灵活设置，并且，外壳21的不同的壁的厚度可以相同也可以不同，例如，盖板212的厚度与壳体211的厚度可以相同，也可以不同；壳体211的不同的壁的厚度可以相同，也可以不同。例如，如图14至图15所示，以盖板212为例，盖板212的厚度T的取值范围为[50μm，200μm]，以保证该电池单体20的结构强度。例如，该盖板212的厚度T可以设置为50μm、60μm、70μm、80μm、90μm、100μm、110μm、120μm、130μm、140μm、150μm、160μm、170μm、180μm、190μm或者200μm。与之类似的，壳体211的任意一个壁的厚度的取值范围为[50μm，200μm]，以保证该电池单体20的结构强度。例如，该壳体211的任意一个壁的厚度T可以设置为50μm、60μm、70μm、80μm、90μm、100μm、110μm、120μm、130μm、140μm、150μm、160μm、170μm、180μm、190μm或者200μm。
可选地，本申请实施例的电池单体20的外壳21还可以设置有泄压机构213。例如，如图14和图15所示，盖板212设置有泄压机构213；或者，不同于图14和图15，也可以在与盖板212相对设置的壁上设置该泄压机构213；或者，也可以在其他壁上设置该泄压机构。本申请实施例的该泄压机构213用于在电池单体20的内部压力或温度达到预定阈值时致动以泄放电池单体20的内部压力或温度。
该预定阈值可以根据设计需求不同而进行调整。该预定阈值可取决于电池单体20中的正极极片、负极极片、电解液和隔离膜中一种或几种的材料。本申请中所提到的“致动”是指泄压机构213产生动作，从而使得电池单体20的内部压力及温度得以被泄放。泄压机构213产生的动作可以包括但不限于：泄压机构213中的至少一部分破裂、被撕裂或者熔化，等等。泄压机构213在致动后，电池单体20内部的高温高压物质作为排放物会从泄压机构213向外排出。以此方式能够在可控压力或温度的情况下使电池单体20发生泄压，从而避免潜在的更严重的事故发生。
本申请中所提到的来自电池单体20的排放物包括但不限于：电解液、被溶解或分裂的正负极极片、隔离膜的碎片、反应产生的高温高压气体、火焰，等等。
电池单体20上的泄压机构213对电池的安全性有着重要影响。例如，当电池单体20发生短路、过充等现象时，可能会导致电池单体20内部发生热失控从而压力或温度骤升。这种情况下通过泄压机构213致动可以将内部压力及温度向外释放，以防止电池单体20爆炸、起火。
可选地，本申请实施例的该泄压机构213可以设置于电池单体20的外壳21的任意一个壁，例如，本申请实施例以该泄压机构213设置在盖板212上为例，但相关描 述同样适用于泄压机构213位于其他壁的情况。另外，该泄压机构213可以为盖板212的一部分，也可以与盖板212为分体式结构，通过例如焊接的方式固定在盖板212上。
例如，泄压机构213也可以与盖板212为分体式结构，泄压机构213可以采用诸如防爆阀、气阀、泄压阀或安全阀等的形式，并可以具体采用压敏或温敏的元件或构造，即，当电池单体20的内部压力或温度达到预定阈值时，泄压机构213执行动作或者泄压机构213中设有的薄弱结构被破坏，从而形成可供内部压力或温度泄放的开口或通道。
再例如，当泄压机构213为盖板212的一部分时，例如，泄压机构213可以通过在盖板212上设置刻痕的方式形成，即泄压机构213为盖板212的刻痕，那么该刻痕所在区域的厚度小于该盖板212的除该刻痕处其他区域的厚度。刻痕处是泄压机构213最薄弱的位置。当电池单体20产生的气体太多使得壳体211内部压力升高并达到阈值或电池单体20内部反应产生热量造成电池单体20内部温度升高并达到阈值时，泄压机构213可以在刻痕处发生破裂而导致壳体211内外相通，气体压力及温度通过泄压机构213的裂开向外释放，进而避免电池单体20发生爆炸。
例如，如图14和图15所示，泄压机构213为设置于电池单体20的外表面的L型刻痕。例如，若泄压机构213位于盖板212，则泄压机构213位于盖板212的远离电池单体20的内部的表面的L型刻痕，即该泄压机构213具有相互连接且相互垂直的两部分，这样，电池单体20内部的温度或者压力达到预设阈值时，该泄压机构213可以沿任一方向被破坏，以便于泄压机构213及时被破坏，以及时泄放电池单体20的内部的压力和温度，避免电池单体20发生爆炸。另外，将泄压机构213的设置在盖板212的外表面，避免电池单体20内部的电解液在刻痕内堆积，避免电解液对泄压机构213的腐蚀，从而也可以提高泄压机构213的安全性。
可选地，如图15所示，本申请实施例的泄压机构213为刻痕时，该刻痕的横截面可以为等腰梯形，一方面便于加工，另一方面，相比于矩形的横截面，可以避免应力集中，提高电池单体20正常使用过程中该泄压机构213的稳定性。
在本申请实施例中，电池单体20的壳体211和盖板212密封连接并形成有围绕壳体211的开口的连接结构216。该连接结构216包括与位于壳体211的第一侧壁2112的电极端子214对应的第一区域2161，并且，电极端子214的凸出于第一侧壁2112的外表面的部分在连接结构216的正投影不超出第一区域2161，即第一区域2161的范围大于或者等于该正投影的范围。这样，在对电池单体20的壳体211和盖板212进行密封连接时，例如通过焊接的方式密封时，可以沿着该第一区域2161的远离电池单体20的内部的边缘进行焊接密封，或者说沿着该第一区域2161的远离电极端子214的边缘进行焊接密封，由于第一区域2161的范围较大，所以不会受到或者很难受到范围相对较小的电极端子214的影响，也很难对电极端子214产生影响，从而可以提高密封效率，保证密封可靠性，提高电池单体20的加工效率和安全性能。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请 并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (24)

  1. 一种电池单体(20)，其特征在于，包括：
    壳体(211)，所述壳体(211)为具有开口(2111)的中空结构，所述壳体(211)的与所述开口(2111)相邻的第一侧壁(2112)设置有电极端子(214)；
    盖板(212)，用于盖合所述开口(2111)，所述盖板(212)和所述壳体(211)密封连接并形成有围绕所述开口(2111)的连接结构(216)，所述连接结构(216)包括与所述电极端子(214)对应的第一区域(2161)，所述电极端子(214)的凸出于所述第一侧壁(2112)的外表面的部分在所述连接结构(216)上的正投影不超出所述第一区域(2161)。
  2. 根据权利要求1所述的电池单体(20)，其特征在于，所述第一区域(2161)凸出于所述第一侧壁(2112)的外表面的高度大于所述电极端子(214)凸出于所述第一侧壁(2112)的外表面的高度。
  3. 根据权利要求2所述的电池单体(20)，其特征在于，所述第一区域(2161)凸出于所述第一侧壁(2112)的外表面的高度与所述电极端子(214)凸出于所述第一侧壁(2112)的外表面的高度的差值的取值范围为[0.5mm，2mm]。
  4. 根据权利要求1至3中任一项所述的电池单体(20)，其特征在于，在所述第一区域(2161)的长度方向上，所述第一区域(2161)的长度大于所述电极端子(214)的长度，所述长度方向分别垂直与所述第一区域(2161)的厚度方向和所述第一区域(2161)的凸出于所述第一侧壁(2112)的外表面的高度方向。
  5. 根据权利要求4所述的电池单体(20)，其特征在于，在所述第一区域(2161)的长度方向上，所述第一区域(2161)的边缘与所述正投影的最小距离的取值范围为[0.5mm，5mm]。
  6. 根据权利要求1至5中任一项所述的电池单体(20)，其特征在于，所述第一侧壁(2112)设置有多个所述电极端子(214)，所述连接结构(216)包括与多个所述电极端子(214)一一对应的多个所述第一区域(2161)。
  7. 根据权利要求1至5中任一项所述的电池单体(20)，其特征在于，所述连接结构(216)包括与所述第一侧壁(2112)对应的第二区域(2162)，所述第二区域(2162)凸出于第一侧壁(2112)的外表面的高度大于所述电极端子(214)凸出于所述第一侧壁(2112)的外表面的高度，所述第二区域(2162)包括所述第一区域(2161)。
  8. 根据权利要求1至7中任一项所述的电池单体(20)，其特征在于，所述电极端子(214)为正极电极端子(214a)。
  9. 根据权利要求1至8中任一项所述的电池单体(20)，其特征在于，所述壳体(211)具有多个所述第一侧壁(2112)。
  10. 根据权利要求1至9中任一项所述的电池单体(20)，其特征在于，所述壳体(211)包括与所述开口(2111)相邻的第二侧壁(2113)，所述第二侧壁(2113)未 设置有电极端子(214)，所述连接结构(216)包括与所述第二侧壁(2113)对应的第三区域(2163)，所述第三区域(2163)凸出于所述第二侧壁(2113)的外表面的高度不等于所述第一区域(2161)凸出于所述第一侧壁(2112)的外表面的高度。
  11. 根据权利要求10所述的电池单体(20)，其特征在于，所述第三区域(2163)凸出于所述第二侧壁(2113)的外表面的高度小于所述第一区域(2161)凸出于所述第一侧壁(2112)的外表面的高度。
  12. 根据权利要求1至11中任一项所述的电池单体(20)，其特征在于，所述电池单体(20)还包括：
    绝缘结构(22)，所述绝缘结构(22)设置在所述第一侧壁(2112)的朝向所述电池单体(20)的内部的一侧，所述第一侧壁(2112)设置有第一通孔(2101)，所述绝缘结构(22)设置有与所述第一通孔(2101)对应的第二通孔(221)，所述电极端子(214)贯穿所述第一通孔(2101)和所述第二通孔(221)，以使所述第一侧壁(2112)和所述绝缘结构(22)铆接。
  13. 根据权利要求12所述的电池单体(20)，其特征在于，所述电池单体(20)还包括：
    密封结构(24)，设置在所述第一侧壁(2112)的远离所述电池单体(20)的内部的一侧，所述密封结构(24)用于电隔离所述电极端子(214)与所述第一侧壁(2112)。
  14. 根据权利要求13所述的电池单体(20)，其特征在于，所述密封结构(24)设置有第五通孔(241)，所述第五通孔(241)的至少部分容纳在所述第一通孔(2101)内，所述电极端子(214)贯穿所述第五通孔(241)，以使所述电极端子(214)与所述第一通孔(2101)之间密封。
  15. 根据权利要求12至14中任一项所述的电池单体(20)，其特征在于，所述第一侧壁(2112)设置有第一限位结构(201)，所述绝缘结构(22)设置有与所述第一限位结构(201)对应的第二限位结构(202)，所述第二限位结构(202)和所述第一限位结构(201)相互配合，以阻止所述绝缘结构(22)与所述第一侧壁(2112)之间的相对移动。
  16. 根据权利要求15所述的电池单体(20)，其特征在于，所述电池单体(20)还包括：
    连接构件(23)，用于与所述电极端子(214)电连接，所述连接构件(23)设置在所述绝缘结构(22)的朝向所述电池单体(20)的内部的一侧，所述连接构件(23)设置有与所述第二通孔(221)对应的第三通孔(231)，所述电极端子(214)贯穿所述第三通孔(231)，以使所述连接构件(23)、所述绝缘结构(22)和所述第一侧壁(2112)铆接。
  17. 根据权利要求16所述的电池单体(20)，其特征在于，所述连接构件(23)还包括第三限位结构(232)，所述第三限位结构(232)与所述第二限位结构(202)相互配合，以阻止所述连接构件(23)与所述绝缘结构(22)之间的相对移动。
  18. 根据权利要求1至17中任一项所述的电池单体(20)，其特征在于，所述盖板 (212)为所述电池单体(20)的面积最大的壁。
  19. 根据权利要求1至18中任一项所述的电池单体(20)，其特征在于，所述盖板(212)设置有泄压机构(213)；或者，
    与所述盖板(212)相对设置的壁上设置有泄压机构(213)。
  20. 根据权利要求19所述的电池单体(20)，其特征在于，所述泄压机构(213)为设置于所述电池单体(20)的外表面的L型刻痕。
  21. 根据权利要求1至20中任一项所述的电池单体(20)，其特征在于，所述壳体(211)的材料包括不锈钢和/或合金；和/或，
    所述盖板(212)的材料包括不锈钢和/或合金。
  22. 根据权利要求1至21中任一项所述的电池单体(20)，其特征在于，所述壳体(211)的厚度的取值范围为[50μm，200μm]；和/或，
    所述盖板(212)的厚度的取值范围为[50μm，200μm]。
  23. 一种电池，其特征在于，包括：
    多个如权利要求1至22中任一项所述的电池单体(20)。
  24. 一种用电设备，其特征在于，包括：
    多个如权利要求1至22中任一项所述的电池单体(20)，所述电池单体(20)用于为所述用电设备提供电能。
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CN216120506U (zh) * 2021-09-22 2022-03-22 东软睿驰汽车技术（沈阳）有限公司 电池模组的盖板组件和具有其的电池模组
CN215933664U (zh) * 2021-09-30 2022-03-01 珠海冠宇电池股份有限公司 一种电池及电子设备
CN114300819A (zh) * 2021-12-29 2022-04-08 宁德新能源科技有限公司 电化学装置、电池模组及用电设备
CN114300817A (zh) * 2021-12-29 2022-04-08 宁德新能源科技有限公司 电化学装置、电池模组及用电设备

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