CN216903143U

CN216903143U - Battery cell, battery and power consumption device

Info

Publication number: CN216903143U
Application number: CN202220240728.1U
Authority: CN
Inventors: 柴志生; 刘超; 迟庆魁; 金海族
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-01-28
Filing date: 2022-01-28
Publication date: 2022-07-05
Anticipated expiration: 2032-01-28

Abstract

The application relates to a battery monomer, battery and power consumption device, relates to the battery field. The battery cell includes a housing including a wall portion; an electrode terminal mounted on the wall portion in an insulated manner; an electrode assembly disposed within the case, the electrode assembly including a main body and a first tab formed at one end of the main body adjacent to the wall portion; a current collecting member disposed between the first tab and the wall portion for connecting the first tab and the electrode terminal; wherein the current collecting member includes a first surface facing the wall portion, the first surface being formed with a groove, a portion of the electrode terminal being received in the groove and abutting against a side wall of the groove. The battery cell has high safety.

Description

Battery cell, battery and power consumption device

Technical Field

The application relates to the field of batteries, in particular to a single battery, a battery and an electric device.

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and the electric vehicle becomes an important component of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.

In addition to improving the performance of batteries, safety issues are also a considerable problem in the development of battery technology. If the safety problem of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to enhance the safety of the battery is a technical problem to be solved urgently in the battery technology.

SUMMERY OF THE UTILITY MODEL

The application aims at providing a single battery, a battery and an electric device, wherein the single battery is high in safety.

In a first aspect, the present application provides a battery cell comprising a housing including a wall portion; an electrode terminal mounted on the wall portion in an insulated manner; an electrode assembly disposed within the case, the electrode assembly including a main body and a first tab formed at one end of the main body adjacent to the wall portion; a current collecting member disposed between the first tab and the wall portion for connecting the first tab and the electrode terminal; wherein the current collecting member includes a first surface facing the wall portion, the first surface being formed with a groove, a portion of the electrode terminal being received in the groove and abutting against a sidewall of the groove.

The utility model provides a battery monomer, through at the first surface formation recess of the face wall portion of collecting current component, and hold some of electrode terminal in the recess and with the lateral wall butt of recess, when electrode terminal receives the extrusion and assaults and invades the shell and extrude the collecting current component, hold in the recess and will play the supporting role to the lateral wall of recess with some electrode terminal of the lateral wall butt of recess, and then reduce the marginal portion of collecting current component and turn over a warping deformation volume towards wall portion, the collecting current component has been prevented to lead to short circuit and thermal runaway in the battery monomer with wall overlap joint, the free security of battery has been improved.

In some embodiments of the present application, the wall portion is provided with an electrode lead-out hole, the electrode terminal includes a terminal body and a first flange, the terminal body is inserted into the electrode lead-out hole, the first flange protrudes out of the outer circumferential surface of the terminal body along the radial direction of the terminal body, the first flange is located on the inner side of the wall portion to limit the electrode terminal to move along a direction departing from the electrode assembly, at least a part of the first flange is accommodated in the groove, and the outer circumferential surface of the first flange abuts against the side wall of the groove.

In the above aspect, at least a portion of the first flange of the electrode terminal is accommodated in the groove, and the outer circumferential surface of the first flange abuts against the side wall of the groove, and the first flange supports the side wall of the groove, thereby reducing the amount of deformation of the current collecting member that is folded and warped toward the wall portion when the electrode terminal presses the current collecting member. Meanwhile, the terminal body penetrates through the electrode leading-out hole, the first flange is located inside the shell, the first flange can limit the terminal body to move towards the direction departing from the electrode assembly, and the stability of connection of the electrode terminal and the current collecting component is guaranteed.

In some embodiments of the present application, the electrode terminal further includes an extension extending from an outer circumferential surface of the first flange in a radial direction of the terminal body, the extension covering at least a portion of the first surface.

In the above aspect, by forming the extension portion covering the first surface on the outer peripheral surface of the first flange on the basis that the outer peripheral surface of the first flange received in the groove supports the side wall of the groove, the extension portion supporting the first surface further prevents the current collecting member from being folded and warped toward the wall portion, and reduces the amount of deformation of the current collecting member when the electrode terminal presses the current collecting member.

In some embodiments of the present application, the extension covers the entire first surface.

In the scheme, the contact area between the extension part and the first surface is large, and the extension part has a good supporting effect on the current collecting member.

In some embodiments of the present application, the electrode terminal includes a second flange protruding from an outer circumferential surface of the terminal body in a radial direction of the terminal body, the second flange being located outside the wall portion to restrict the electrode terminal from moving in a direction toward the electrode assembly.

In the above aspect, the second flange can restrict the terminal body from moving toward the electrode assembly when the electrode terminal is slightly pressed, preventing the electrode terminal from pressing the current collecting member.

In some embodiments of the present application, the battery cell further includes a first insulating member disposed between the current collecting member and the wall portion for insulating and isolating the current collecting member and the wall portion; wherein, the first surface is also provided with a bulge, and the bulge is used for supporting the first insulating part.

In the above scheme, on one hand, the first insulating piece realizes the insulation and isolation between the current collecting component and the wall, and on the other hand, when the electrode terminal presses the current collecting component to cause the current collecting component to turn over and warp towards the wall, the first insulating piece can play a role in buffering, so that the current collecting component is prevented from directly overlapping with the wall to cause a short circuit in the battery cell, and the safety of the battery cell is improved. Meanwhile, the first surface is also provided with the bulge, and the bulge plays a supporting role for the first insulating part and simultaneously reduces the deformation amount of the current collecting component which is turned and warped towards the wall part when the electrode terminal extrudes the current collecting component.

In some embodiments of the present application, the protrusion is an annular protrusion disposed around the electrode terminal; or, the number of the projections is multiple, and the projections are distributed around the electrode terminal at intervals.

In the above scheme, in the embodiment that the protrusion is the annular protrusion arranged around the central axis of the electrode terminal, the annular protrusion and the first insulating part can be in good abutting joint, and the supporting effect of the annular protrusion on the first insulating part is uniform. In the embodiment that the number of the bulges is multiple and the bulges are distributed at intervals around the central axis of the electrode terminal, the material of the first insulating part is reduced, and the molding difficulty of the first insulating part is reduced.

In some embodiments of the present application, the first insulator is provided with a clamping groove, and the protrusion is clamped with the clamping groove.

In the above scheme, the first insulating part is provided with the clamping groove, and the protrusion is clamped with the clamping groove, so that the assembly positioning precision of the current collecting component and the first insulating part during assembly is improved.

In some embodiments of the present application, the housing includes a casing body and an end cover, the casing body includes a bottom wall and a side wall, the side wall is enclosed around the bottom wall, one end of the side wall is connected with the bottom wall, the other end of the side wall encloses an opening opposite to the bottom wall, the end cover covers the opening, and the wall portion is the bottom wall or the end cover.

In the above-mentioned scheme, bottom wall and lateral wall limit the space that is used for holding electrode subassembly, electrolyte and other structures to cover the opening that the lateral wall encloses through the end cover, guaranteed the leakproofness of shell.

In some embodiments of the present application, the battery cell further includes a reinforcement disposed in the housing and located at a connection between the wall portion and the sidewall, one end of the reinforcement is connected to the wall portion, and the other end of the reinforcement is connected to the sidewall.

In the above scheme, the reinforcing piece is arranged between the wall part and the side wall, so that the deformation amount of the wall part towards the current collecting member when the wall part is extruded is reduced, the risk of overlapping the current collecting member and the wall part is further reduced, and the safety of the battery cell is improved.

In some embodiments of the present application, the reinforcement member is a ring-shaped member disposed around the electrode terminal.

In the above scheme, the annular reinforcing member is convenient for being connected with the side wall and the wall part, so that the reinforcing member has strong connection stability with the side wall and the wall part.

In some embodiments of the present application, the battery cell further includes a second insulator wrapped around a side of the reinforcement facing the current collecting member.

In the above scheme, the arrangement of the second insulating part reduces the risk of overlapping the electrode terminal and the reinforcing part when the electrode terminal extrudes the current collecting component to cause the current collecting component to turn and warp towards the wall part, thereby preventing the internal short circuit of the single battery and improving the safety of the single battery.

In some embodiments of the present application, the electrode assembly further includes a second tab formed at an end of the body remote from the wall portion, the second tab having an opposite polarity to the first tab, the second tab being electrically connected to the wall portion.

In the above scheme, the first tab and the second tab are located at two ends of the electrode assembly, and the first tab and the second tab have good insulativity, so that the risk of short circuit in a single battery is reduced, and the safety of the single battery is improved.

In a second aspect, the present application also provides a battery including the battery cell described above.

In a third aspect, the present application further provides an electric device, including the above battery, where the battery is used for providing electric energy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic illustration of a vehicle provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present disclosure;

fig. 3 is an exploded view of a battery cell according to an embodiment of the present disclosure;

fig. 4 is a cross-sectional view of a battery cell provided in an embodiment of the present application;

FIG. 5 is an enlarged view of a portion of the area A provided in accordance with an embodiment of the present application;

fig. 6 is a schematic view of an electrode terminal including an extension portion according to an embodiment of the present application;

FIG. 7 is an enlarged view of a portion of the area B provided in accordance with an embodiment of the present application;

fig. 8 is a schematic view illustrating a first insulating member provided to a battery cell according to an embodiment of the present disclosure;

FIG. 9 is an enlarged view of a portion of the area C provided in accordance with an embodiment of the present application;

fig. 10 is a schematic view of a current collecting member forming an annular protrusion according to an embodiment of the present application;

fig. 11 is a schematic view of a current collecting member forming a plurality of protrusions provided in accordance with an embodiment of the present application;

FIG. 12 is a schematic view of an embodiment of a protrusion and a slot in a card according to an embodiment of the present disclosure;

FIG. 13 is an enlarged view of a portion of a section D provided in accordance with an embodiment of the present application;

FIG. 14 is a schematic view of another embodiment of a protrusion and a slot in accordance with an embodiment of the present application;

FIG. 15 is an enlarged view of a portion of the area E provided by an embodiment of the present application;

fig. 16 is a schematic diagram of a battery cell according to an embodiment of the present disclosure;

fig. 17 is a schematic view of a cell arrangement reinforcement according to an embodiment of the present disclosure;

fig. 18 is a partial enlarged view of a portion at F provided in an embodiment of the present application.

Icon: 10-a battery cell; 11-a housing; 11 a-a wall portion; 11 b-electrode exit holes; 111-a housing; 1111-bottom wall; 1112-a side wall; 112-an end cap; 12-an electrode terminal; 121-a terminal body; 122 — a first flange; 1221-an extension; 123-a second flange; 13-an electrode assembly; 131-a first tab; 132-a body; 133-a second tab; 14-a current collecting member; 141-a first surface; 142-a groove; 143-bumps; 1431-a projection body; 1432-a snap-fit portion; 15-a first insulator; 151-card slot; 16-a reinforcement; 161-a second insulator; 20-a box body; 21-a first sub-tank; 22-a second sub-tank; 100-a battery; 200-a controller; 300-a motor; 1000-vehicle.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In this application, reference to a battery refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and a diaphragm. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative pole mass flow body, and the negative pole mass flow body protrusion in the negative pole mass flow body of coating the negative pole active substance layer not coating the negative pole active substance layer, and the negative pole mass flow body of not coating the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the diaphragm may be PP (Polypropylene) or PE (Polyethylene).

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

For the sake of convenience in understanding the following description, the battery cell will be described first, and the battery cell includes a case including a wall portion and an electrode terminal provided to the wall portion.

The inventors have noticed that the electrode terminals and the wall parts are low in design strength, are easily deformed when the electrode terminals and the wall parts are pressed and impacted, and intrude into the case of the battery cell and press the current collecting member. When the electrode terminal presses the current collecting member, the portion of the current collecting member in abutment with the electrode terminal (the central portion of the current collecting member) will be subjected to a large pressing force and impact force, causing the central portion of the current collecting member to be depressed toward the electrode assembly, while the edge portion of the current collecting member is turned back and warped toward the wall portion. Furthermore, when the wall portion is squeezed and impacted, the wall portion can also bend and deform towards the current collecting component, the risk of overlapping exists between the current collecting component and the wall portion, the overlapping of the current collecting component and the wall portion can cause the internal short circuit of the single battery, serious potential safety hazards exist, and the safety of the single battery and the safety of the battery are seriously affected. In addition, when the central part of the current collecting component is sunken towards the electrode component, the pole pieces (the general names of the positive pole piece and the negative pole piece) can be extruded, the pole pieces can be extruded to cause the problems of decarburization, dislocation and the like, short circuit in the single battery body is caused, thermal runaway is caused, the performance of the single battery is deteriorated, the great safety is ensured, and the safety of the single battery and the safety of the battery are seriously influenced.

In view of the above, in order to reduce the amount of deformation of the current collecting member, such as the amount of deformation of the central portion of the current collecting member depressed toward the electrode assembly and the amount of deformation of the edge portion of the current collecting member folded and warped toward the wall portion when the electrode terminals and the wall portion are pressed, the inventors have conducted extensive studies to design a battery cell having a current collecting member including a first surface facing the wall portion, the first surface being formed with a groove, a portion of the electrode terminals being received in the groove and abutting against a side wall of the groove.

In the battery cell, the groove is formed on the first surface of the current collecting component facing the wall part, and part of the electrode terminal is accommodated in the groove and abutted against the side wall of the groove, when the electrode terminal is extruded and impacted to invade the shell and extrude the current collecting component, the part of the electrode terminal accommodated in the groove and abutted against the side wall of the groove can support the side wall of the groove, so that the deformation quantity of the edge part of the current collecting component which is folded and warped towards the wall part is reduced, the phenomenon that the current collecting component is overlapped with the wall part to cause short circuit and thermal runaway in the battery cell is prevented, and the safety of the battery cell is improved.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments are described by taking an electric device of the embodiments of the present application as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic view of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 20 and a battery cell 10, and the battery cell 10 is accommodated in the case 20. The case 20 is used to provide a receiving space for the battery cell 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first sub-case 21 and a second sub-case 22, the first sub-case 21 and the second sub-case 22 cover each other, and the first sub-case 21 and the second sub-case 22 together define a receiving space for receiving the battery cell 10. The second sub-box 22 may be a hollow structure with an opening at one end, the first sub-box 21 may be a plate-shaped structure, and the first sub-box 21 covers the opening side of the second sub-box 22, so that the first sub-box 21 and the second sub-box 22 define an accommodating space together; the first sub-box 21 and the second sub-box 22 may be both hollow structures with one side open, and the open side of the first sub-box 21 covers the open side of the second sub-box 22. Of course, the case 20 formed by the first sub-case 21 and the second sub-case 22 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery cells 10 may be multiple, and the multiple battery cells 10 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to that the multiple battery cells 10 are connected in series or in parallel. The plurality of single batteries 10 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of single batteries 10 is accommodated in the box body 20; of course, the battery 100 may also be formed by connecting a plurality of battery cells 10 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and accommodating the whole in the case 20. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 10.

Wherein each battery cell 10 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 10 may be cylindrical, flat, rectangular parallelepiped, or other shapes.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 10 according to some embodiments of the present disclosure. The battery cell 10 refers to the smallest unit constituting the battery 100. As shown in fig. 3, the battery cell 10 includes a case 11, an electrode assembly 13, and other functional components.

The case 11 is an assembly for forming an internal environment of the battery cell 10, wherein the internal environment formed by the case 11 may be used to house the electrode assembly 13, an electrolyte, and other components. The housing 11 may be of various shapes and various sizes, such as cylindrical, rectangular parallelepiped, hexagonal prism, etc. Specifically, the shape of the case 11 may be determined according to the specific shape and size of the electrode assembly 13. The material of the housing 11 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

The electrode assembly 13 is a part in which electrochemical reactions occur in the battery cell 10. One or more electrode assemblies 13 may be contained within the housing 11. The electrode assembly 13 is mainly formed by winding or stacking a positive electrode tab and a negative electrode tab, and a separator is usually provided between the positive electrode tab and the negative electrode tab. The portions of the positive and negative electrode sheets having active materials constitute the main body 132 of the electrode assembly 13, and the portions of the positive and negative electrode sheets having no active materials constitute tabs, respectively. The positive and negative electrode tabs may be located together at one end of the main body 132 portion or separately at both ends of the main body 132 portion. During the charge and discharge of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs are connected to the electrode terminals 12 to form a current loop.

Referring to fig. 4 and 5, fig. 4 is a cross-sectional view of a battery cell 10 according to some embodiments of the present disclosure, and fig. 5 is a partially enlarged view of a portion a according to some embodiments of the present disclosure. The present application provides a battery cell 10, the battery cell 10 including a case 11, an electrode terminal 12, an electrode assembly 13, and a current collecting member 14.

As shown in fig. 4 and 5, the housing 11 includes a wall portion 11a, and the electrode terminal 12 is mounted on the wall portion 11a in an insulated manner. The electrode assembly 13 is disposed in the case 11, and the electrode assembly 13 includes a main body 132 and a first tab 131, and the first tab 131 is formed at one end of the main body 132 near the wall portion 11 a. The current collecting member 14 is disposed between the electrode assembly 13 and the wall 11a, for example, the current collecting member 14 is disposed between the first tab 131 and the wall 11a, and the current collecting member 14 serves to connect the first tab 131 and the electrode terminal 12. Wherein the current collecting member 14 includes a first surface 141 facing the wall portion 11a, the first surface 141 is formed with a groove 142, and a portion of the electrode terminal 12 is received in the groove 142 and abuts against a side wall 1112 of the groove 142.

For example, the electrode terminal 12 is mounted on the wall 11a in an insulated manner, and an insulating structure may be disposed between the electrode terminal 12 and the wall 11a to ensure that the electrode terminal 12 and the wall 11a are not directly overlapped to cause a short circuit in the battery cell 10.

It should be appreciated that in some embodiments of the present application, the portion of the electrode terminal 12 received within the groove 142 and abutting the side walls 1112 of the groove 142 is configured such that when the electrode terminal 12 is impacted to compress the current collecting member 14 causing deformation of the current collecting member 14, the portion of the electrode terminal 12 received within the groove 142 and abutting the side walls 1112 of the groove 142 immediately supports the side walls 1112 of the groove 142 to cause less or no deformation of the current collecting member 14.

Of course, in other embodiments of the present application, there may be a certain gap between the portion of the electrode terminal 12 received in the groove 142 and the sidewall 1112 of the groove 142. A gap should be provided between the current collecting member 14 and the wall portion 11a in the thickness direction of the wall portion 11a to prevent the current collecting member 14 from overlapping the wall portion 11a to cause a short circuit in the battery cell 10, and when the electrode terminal 12 is impacted to press the current collecting member 14 and cause deformation of the current collecting member 14, the current collecting member 14 does not immediately overlap the wall portion 11a, but causes the current collecting member 14 to overlap the wall portion 11a when the amount of deformation of the current collecting member 14 is excessively large and greater than the gap between the current collecting member 14 and the wall portion 11 a. Therefore, a certain gap may be provided between the portion of the electrode terminal 12 received in the groove 142 and the side wall 1112 of the groove 142, and when the current collecting member 14 is deformed, the electrode terminal 12 received in the groove 142 may abut against the groove 142 and prevent the current collecting member 14 from being further deformed as long as it is ensured that the edge portion of the current collecting member 14 overlaps the wall portion 11 a. It is understood that a certain amount of deformation of the current collecting member 14 is allowed as long as it is ensured that the amount of deformation of the current collecting member 14 is smaller than the distance between the current collecting member 14 and the wall portion 11 a.

It should be noted that the size of the gap between the electrode terminal 12 received in the groove 142 and the side wall 1112 of the groove 142 is not particularly limited, and the size of the gap between the electrode terminal 12 received in the groove 142 and the side wall 1112 of the groove 142 may be determined according to the size between the current collecting member 14 and the wall portion 11a, as long as it is ensured that the current collecting member 14 does not overlap the wall portion 11a, that is, the maximum deformation amount of the current collecting member 14 is smaller than the distance between the current collecting member 14 and the wall portion 11 a.

In some embodiments of the present application, illustratively, the thickness of a portion of the current collecting member 14 forming the groove 142 is smaller than the thickness of the other portion of the current collecting member 14, and when the electrode terminal 12 is impacted to press the current collecting member 14, the electrode terminal 12 will press the portion of the current collecting member 14 forming the groove 142, that is, the electrode terminal 12 will press the thinner portion of the current collecting member 14. Therefore, in order to ensure that the current collecting member 14 is not damaged or torn, the thickness of the portion of the current collecting member 14 where the groove 142 is formed should also be able to withstand the compression of the electrode terminal 12. The thickness of the current collecting member 14 (the thickness of the portion of the current collecting member 14 where the groove 142 is formed and the thickness of the other portion of the current collecting member 14) is not particularly limited as long as it can be ensured that the current collecting member 14 is not damaged or torn after being pressed by the electrode terminal 12. Illustratively, there may be a proportional relationship between the thickness of the portion of the current collecting member 14 forming the slot 142 and the thickness of the other portion of the current collecting member 14, such as the portion of the current collecting member 14 forming the slot 142 having a thickness greater than one third of the thickness of the other portion of the current collecting member 14, or the portion of the current collecting member 14 forming the slot 142 having a thickness greater than one half of the thickness of the other portion of the current collecting member 14.

In the battery cell 10 of the present application, the groove 142 is formed in the first surface 141 of the current collecting member 14 facing the wall portion 11a, and a portion of the electrode terminal 12 is accommodated in the groove 142 and abuts against the side wall 1112 of the groove 142, so that when the electrode terminal 12 is pressed and impacted to intrude into the case 11 and press the current collecting member 14, the portion of the electrode terminal 12 accommodated in the groove 142 and abutting against the side wall 1112 of the groove 142 supports the side wall 1112 of the groove 142, and further reduces the deformation amount of the edge portion of the current collecting member 14 folded and warped toward the wall portion 11a, thereby preventing the current collecting member 14 from overlapping the wall portion 11a to cause short circuit and thermal runaway in the battery cell 10, and improving the safety of the battery cell 10.

As shown in fig. 5, in some embodiments of the present disclosure, the wall 11a is provided with an electrode lead-out hole 11b, the electrode terminal 12 includes a terminal body 121 and a first flange 122, the terminal body 121 is inserted into the electrode lead-out hole 11b, the first flange 122 protrudes from an outer circumferential surface of the terminal body 121 in a radial direction of the terminal body 121, the first flange 122 is located inside the wall 11a to limit the electrode terminal 12 from moving in a direction away from the electrode assembly 13, at least a portion of the first flange 122 is accommodated in the groove 142, and the outer circumferential surface of the first flange 122 abuts against a sidewall 1112 of the groove 142.

The wall portion 11a is provided with an electrode lead-out hole 11b, the electrode lead-out hole 11b penetrates the wall portion 11a in the thickness direction of the wall portion 11a, and the electrode lead-out hole 11b provides a mounting position for the electrode terminal 12.

It should be understood that the electrode terminal 12 includes a terminal body 121 and a first flange 122, and the electrode terminal 12 is mounted on the wall portion 11a in an insulated manner, i.e. between the terminal body 121 and the wall portion 11a and between the first flange 122 and the wall portion 11a, for example, the terminal body 121 is inserted into the electrode lead-out hole 11b, and an insulated structure is provided between the outer peripheral wall of the terminal body 121 and the electrode lead-out hole 11 b.

The first flange 122 protrudes from the outer circumferential surface of the terminal body 121 in the radial direction of the terminal body 121, and for example, in order to ensure sufficient area abutment between the electrode terminal 12 and the current collecting member 14 to ensure stability of the electrical connection between the electrode terminal 12 and the current collecting member 14, an end surface of the terminal body 121 facing the current collecting member 14 and a side surface of the first flange 122 facing the current collecting member 14 may be disposed to be coplanar.

Specifically, the electrode lead-out hole 11b may be provided as a circular hole, an elliptical hole, a polygonal hole (e.g., a square hole), or the like. Correspondingly, the cross section of the terminal body 121 may be circular, oval, polygonal (e.g., square), and it should be noted that the shape of the cross section of the terminal body 121 may be the same as or different from the shape of the electrode lead-out hole 11 b.

Further, the contour (outer contour) of the outer peripheral surface of the first flange 122 should match the contour of the side wall 1112 of the groove 142, for example, when the contour of the side wall 1112 of the groove 142 is set to be circular, the outer contour of the first flange 122 should be circular, or when the contour of the side wall 1112 of the groove 142 is set to be square, the outer contour of the first flange 122 should also be square. For example, the contour of the sidewall 1112 of the groove 142 and the contour of the first flange 122 are both set to be circular, so as to ensure that when the current collecting member 14 is deformed by being pressed by the electrode terminal 12, the outer circumferential surface of the first flange 122 can be in relatively uniform abutment with the sidewall 1112 of the groove 142, so as to prevent the current collecting member 14 from further deforming.

The first flange 122 is located inside the wall portion 11a to limit the movement of the electrode terminal 12 in a direction away from the electrode assembly 13, and illustratively, the area of the outer contour of the first flange 122 should be larger than the area of the electrode lead-out hole 11b to prevent the first flange 122 from coming out of the electrode lead-out hole 11b, that is, the electrode terminal 12 from coming out of the electrode lead-out hole 11 b.

In this arrangement, at least a part of the first flange 122 of the electrode terminal 12 is accommodated in the groove 142, and the outer peripheral surface of the first flange 122 abuts against the side wall 1112 of the groove 142, so that the first flange 122 supports the side wall 1112 of the groove 142, thereby reducing the amount of deformation of the current collecting member 14 that is folded and warped toward the wall portion 11a when the electrode terminal 12 presses the current collecting member 14. Meanwhile, the terminal body 121 is inserted into the electrode drawing hole 11b, and the first flange 122 is located inside the case 11, the first flange 122 can limit the terminal body 121 from moving in a direction away from the electrode assembly 13, so that the stability of connection between the electrode terminal 12 and the current collecting member 14 is ensured.

Referring to fig. 6 and 7, fig. 6 is a schematic view illustrating the electrode terminal 12 including the extension 1221 according to some embodiments of the present disclosure, and fig. 7 is a partial enlarged view of the electrode terminal at B according to some embodiments of the present disclosure. In some embodiments of the present application, the electrode terminal 12 further includes an extension 1221, the extension 1221 extending from an outer circumferential surface of the first flange 122 in a radial direction of the terminal body 121, the extension 1221 covering at least a portion of the first surface 141.

It should be understood that, as shown in fig. 6 and 7, the extension 1221 is provided to cover at least a portion of the first surface 141, and when the edge portion of the current collecting member 14 is deformed to be folded and warped toward the wall portion 11a, the extension 1221 can serve as a stopper and a support abutment for the current collecting member 14, thereby reducing the amount of deformation of the current collecting member 14 and preventing the amount of deformation of the current collecting member 14 from being excessively large to abut against the wall portion 11 a.

The extension 1221 covers at least a part of the first surface 141, and when the extension 1221 extends from the outer peripheral surface of the first flange 122 in the radial direction of the terminal body 121, the extension 1221 should be located on the side of the outer peripheral surface of the first flange 122 close to the wall portion 11 a. For example, the side of the extension 1221 facing the wall 11a may be coplanar with the side of the first flange 122 facing the wall 11 a.

Further, the extension 1221 covers at least a portion of the first surface 141, that is, along the thickness direction of the wall 11a, a projection of the extension 1221 on the first surface 141 covers at least a portion of the first surface 141, and the application does not limit whether the extension 1221 is attached to the first surface 141. For example, the extension 1221 covers at least a portion of the first surface 141, and the extension 1221 may be attached to the first surface 141, or a gap may be formed between the extension 1221 and the first surface 141 along the thickness direction of the wall 11 a. It is to be understood that when the extending portions 1221 are engaged with the first surface 141, the extending portions 1221 may abut against the first surface 141 to prevent deformation of the current collecting member 14, as long as the current collecting member 14 is deformed toward the wall portion 11a or the current collecting member 14 has a tendency to be deformed toward the wall portion 11 a; alternatively, when there is a gap between the extension 1221 and the first surface 141 in the thickness direction of the wall portion 11a, the current collecting member 14 is allowed to have a certain amount of deformation, and when the amount of deformation of the current collecting member 14 is equal to the distance between the extension 1221 and the first surface 141, the extension 1221 abuts against the first surface 141 and the current collecting member 14 is prevented from being deformed further toward the wall portion 11 a.

This arrangement further prevents the current collecting member 14 from being folded back and warped toward the wall portion 11a by forming the extension 1221 covering the first surface 141 on the outer peripheral surface of the first flange 122 with the extension 1221 supporting the first surface 141, with the outer peripheral surface of the first flange 122 received in the groove 142 supporting the side wall 1112 of the groove 142, and reduces the amount of deformation of the current collecting member 14 when the electrode terminal 12 presses the current collecting member 14.

In some embodiments of the present application, the extension 1221 covers the entire first surface 141.

With this arrangement, the contact area between the extension 1221 and the first surface 141 is large, and the extension 1221 has a good supporting effect on the current collecting member 14.

As shown in fig. 4 to 7, in some embodiments of the present application, the electrode terminal 12 includes a second flange 123, the second flange 123 protruding from the outer circumferential surface of the terminal body 121 in a radial direction of the terminal body 121, the second flange 123 being located outside the wall portion 11a to restrict the electrode terminal 12 from moving in a direction toward the electrode assembly 13.

The second flange 123 protrudes from the outer circumferential surface of the terminal body 121 in the radial direction of the terminal body 121, and may be, for example, a side surface of the second flange 123 facing away from the wall portion 11a and an end surface of the terminal body 121 facing away from the current collecting member 14 are coplanar.

The outline (outer contour) of the outer peripheral surface of the second flange 123 may be circular, polygonal (e.g., square), or the like.

The second flange 123 is located at the outer side of the wall portion 11a to restrict the electrode terminal 12 from moving in a direction toward the electrode assembly 13, and illustratively, the area of the outer contour of the second flange 123 should be larger than the area of the electrode lead-out hole 11b to prevent the second flange 123 from protruding into the electrode lead-out hole 11b, i.e., to prevent the electrode terminal 12 from completely protruding into the interior of the case 11.

This arrangement allows the second flange 123 to restrict the movement of the terminal body 121 toward the electrode assembly 13 when the electrode terminal 12 is slightly pressed, preventing the electrode terminal 12 from pressing the current collecting member 14.

Referring to fig. 8 and 9, fig. 8 is a schematic view illustrating a first insulating member 15 provided on a battery cell 10 according to some embodiments of the present disclosure, and fig. 9 is a partially enlarged view of a portion C according to some embodiments of the present disclosure. In some embodiments of the present application, the battery cell 10 further includes a first insulator 15, the first insulator 15 being disposed between the current collecting member 14 and the wall portion 11a, the first insulator 15 serving to insulate and separate the current collecting member 14 and the wall portion 11 a; wherein, the first surface 141 is further formed with a protrusion 143, and the protrusion 143 is used for supporting the first insulating member 15.

The first insulator 15 is provided between the current collecting member 14 and the wall portion 11a, and on the one hand, the first insulator 15 can be used to insulate and separate the current collecting member 14 and the wall portion 11a, and on the other hand, the first insulator 15 can also prevent the current collecting member 14 from directly overlapping the wall portion 11a when the current collecting member 14 is deformed to be turned over toward the wall portion 11 a. It is understood that when the amount of deformation of the current collecting member 14 is excessive, the current collecting member 14 also needs to press the first insulating member 15 and damage the pierced first insulating member 15 to overlap the wall portion 11a to cause a short circuit in the battery cell 10, and the provision of the first insulating member 15 between the current collecting member 14 and the wall portion 11a further reduces the risk of the current collecting member 14 overlapping the wall portion 11 a.

For example, the first insulator 15 is provided between the current collecting member 14 and the wall portion 11a, and the first insulator 15 may be attached to a surface of the wall portion 11a facing the current collecting member 14, or the first insulator 15 may be attached to a surface of the current collecting member 14 facing the wall portion 11a, or both side surfaces of the first insulator 15 along the thickness of the wall portion 11a may be attached to neither the wall portion 11a nor the current collecting member 14.

Further, in some embodiments of the present application, the electrode terminal 12 is mounted on the wall 11a in an insulated manner, and the insulating structure between the electrode terminal 12 and the wall 11a may also be the first insulating member 15. Illustratively, a portion of the first insulating member 15 is located between the current collecting member 14 and the wall portion 11a, and another portion of the first insulating member 15 extends between the electrode terminal 12 and the wall portion 11a, and at this time, the first insulating member 15 achieves insulation between the current collecting member 14 and the wall portion 11a, and also achieves insulation between the electrode terminal 12 and the wall portion 11 a. Further, when the first insulating member 15 extends between the electrode terminal 12 and the wall portion 11a, the first insulating member 15 can also be sandwiched by the electrode terminal 12 and the wall portion 11a, thereby achieving the mounting fixation of the first insulating member 15.

Alternatively, the first insulating member 15 may be made of plastic, such as PVC (Polyvinyl Chloride), PP (Polypropylene), or the like, or the first insulating member 15 may also be made of rubber, such as butyl rubber, styrene butadiene rubber, silicon rubber, or the like.

For example, the protrusion 143 may support the first insulating member 15, and the protrusion 143 may be attached to or abutted against a surface of the first insulating member 15 facing the current collecting member 14, so that the protrusion 143 supports the first insulating member 15, or the protrusion 143 may have a certain gap with the surface of the first insulating member 15 facing the current collecting member 14, and when the first insulating member 15 is deflected and the amount of deformation reaches a distance between the protrusion 143 and the first insulating member 15, the protrusion 143 may abut against the surface of the first insulating member 15 facing the current collecting member 14 and support the first insulating member 15. It is understood that the protrusion 143 can be used to support the first insulating member 15.

In addition, the protrusion 143 is provided, and whether the protrusion 143 is attached to the surface of the first insulating member 15 facing the current collecting member 14 or has a certain gap, when the current collecting member 14 is deformed to be folded and warped toward the wall portion 11a or the current collecting member 14 has a tendency to be folded and warped toward the wall portion 11a, that is, when the protrusion 143 moves toward the first insulating member 15, the first insulating member 15 can also support the protrusion 143 to some extent, and thus, the protrusion 143 can be prevented from moving toward the first insulating member 15, that is, the current collecting member 14 can be prevented from being folded and warped toward the wall portion 11 a.

It is noted that in other embodiments of the present application, it is also possible that the surface of the first insulating member 15 facing the current collecting member 14 is formed with the projections 143.

In this arrangement, on the one hand, the first insulating member 15 provides insulation between the current collecting member 14 and the wall portion 11a, and on the other hand, when the electrode terminals 12 press the current collecting member 14 to cause the current collecting member 14 to turn and warp toward the wall portion 11a, the first insulating member 15 can play a role of buffering, thereby preventing the current collecting member 14 from directly overlapping with the wall portion 11a to cause a short circuit in the battery cell 10, and improving the safety of the battery cell 10. Meanwhile, the first surface 141 is also formed with the protrusion 143, and the amount of deformation of the current collecting member 14 that is folded and warped toward the wall portion 11a when the electrode terminal 12 presses the current collecting member 14 is reduced while the protrusion 143 supports the first insulating member 15.

Referring to fig. 10 and 11, fig. 10 is a schematic view of the current collecting member 14 forming the annular protrusion 143 according to some embodiments of the present application, and fig. 11 is a schematic view of the current collecting member 14 forming the plurality of protrusions 143 according to some embodiments of the present application. In some embodiments of the present application, the protrusion 143 is an annular protrusion 143 disposed around the central axis of the electrode terminal 12, or the number of the protrusions 143 is plural, and the plural protrusions 143 are spaced around the central axis of the electrode terminal 12.

As shown in fig. 10, in some embodiments of the present application, the protrusion 143 is an annular protrusion 143 disposed around the central axis of the electrode terminal 12. Here, the annular protrusion 143 is not limited to a circular ring, and the annular protrusion 143 may also have an oval shape, a square shape, a polygonal shape, or the like, as long as the annular protrusion 143 forms a closed ring shape that surrounds the central axis of the electrode terminal 12.

As shown in fig. 11, in some embodiments of the present application, the number of the protrusions 143 is plural, and the plural protrusions 143 are spaced around the central axis of the electrode terminal 12. The plurality of protrusions 143 may be spaced around the central axis of the electrode terminal 12, the plurality of protrusions 143 may be spaced around the central axis of the electrode terminal 12 at the same circumference, or the plurality of protrusions 143 may be spaced around the central axis of the electrode terminal 12 at different circumferences. For example, a portion of the plurality of protrusions 143 may be spaced apart around the central axis of the electrode terminal 12 in a first circle, another portion of the plurality of protrusions 143 may be spaced apart around the central axis of the electrode terminal 12 in a second circle, the diameter of the first circle is different from that of the second circle, and the number of protrusions 143 located in the first circle may be the same as or different from that of the protrusions 143 located in the second circle.

When the number of the protrusions 143 is plural, the shape of the protrusions 143 may be cylindrical, prismatic, fan-shaped ring, or the like.

It should be noted that the specific shape and number of the protrusions 143 and the arrangement position of the protrusions 143 are not limited in the present application.

Further, in some embodiments of the present application, when the protrusion 143 is provided in plurality, the projection area of the protrusion 143 on the current collecting member 14, which is distant from the electrode terminal 12, is larger, and the projection area of the protrusion 143 on the current collecting member 14, which is close to the electrode terminal 12, is smaller. Similarly, in some embodiments of the present disclosure, when the number of the protrusions 143 is multiple, the protrusions 143 far away from the electrode terminal 12 are dense, and the protrusions 143 near the electrode terminal 12 are sparse.

In this arrangement, in the embodiment in which the protrusion 143 is an annular protrusion 143 disposed around the central axis of the electrode terminal 12, the annular protrusion 143 can be in good contact with the first insulating member 15, and the annular protrusion 143 has a uniform supporting effect on the first insulating member 15. In the embodiment in which the number of the protrusions 143 is plural and the plural protrusions 143 are spaced apart around the central axis of the electrode terminal 12, the material of the first insulating member 15 is reduced, and the difficulty in molding the first insulating member 15 is reduced.

Referring to fig. 12-15, fig. 12 is a schematic view illustrating an embodiment of a protrusion 143 and a slot 151 of some embodiments of the present disclosure, fig. 13 is a partial enlarged view of a portion D of some embodiments of the present disclosure, fig. 14 is a schematic view illustrating another embodiment of a protrusion 143 and a slot 151 of some embodiments of the present disclosure, and fig. 15 is a partial enlarged view of a portion E of some embodiments of the present disclosure. In some embodiments of the present application, as shown in fig. 12-15, the first insulating member 15 is provided with a locking groove 151, and the protrusion 143 is locked with the locking groove 151.

It will be appreciated that projection 143 engages with slot 151 and at least a portion of projection 143 is positioned within slot 151. In addition, the protrusion 143 is engaged with the slot 151, and a portion of the protrusion 143 located in the slot 151 should have a fitting portion with the slot 151, so as to achieve the engagement between the protrusion 143 and the slot 151.

Illustratively, as shown in fig. 13 and 15, in some embodiments of the present application, the protrusion 143 includes a protrusion body 1431 and a snap-in portion 1432, the snap-in portion 1432 is disposed around the protrusion body 1431 along a side wall 1112 of the protrusion body 1431 (e.g., when the protrusion 143 is an annular protrusion 143, the side wall 1112 of the protrusion body 1431 refers to an inner side wall 1112 and an outer side wall 1112 of the protrusion body 1431, and when the protrusion 143 is a plurality of cylindrical protrusions 143, the side wall 1112 of the protrusion body 1431 refers to an outer peripheral wall of the protrusion body 1431), and the snap-in portion 1432 protrudes from the side wall 1112 of the protrusion body 1431. Further, as shown in fig. 13 and 15, the protrusion 143 may be clamped with the slot 151 by a clamping portion 1432, and in order to enable the clamping portion 1432 to be located in the slot 151, the clamping portion 1432 should be disposed at an end of the protrusion body 1431 close to the first insulating member 15.

Specifically, the present application is not limited to the formation position of the protrusion 143 and the specific structural form of the protrusion 143 and the card slot 151. For example, as shown in fig. 13, when the projection of the protrusion body 1431 on the current collecting member 14 is located in the current collecting member 14 (the outer contour of the projection of the protrusion body 1431 is not overlapped with the outer contour of the current collecting member 14), the clamping portion 1432 may be protruded from the protrusion body 1431 along the outer sidewall 1112 and the inner sidewall 1112 of the protrusion body 1431, so that the clamping stability between the clamping portion 1432 and the clamping groove 151 is high.

Alternatively, as shown in fig. 15, when the outer contour of the projection of the protrusion body 1431 on the current collecting member 14 coincides with the outer contour of the current collecting member 14, the snap-in part 1432 may also protrude from the protrusion body 1431 along the inner sidewall 1112 of the protrusion body 1431, so as to ensure that there is a sufficient gap between the protrusion 143 and the sidewall 1112 of the housing 11, and prevent the protrusion 143 from overlapping with the housing 11.

In some embodiments, the manufacturing process of the battery cell 10 requires welding the current collecting member 14 to the electrode assembly 13 before the current collecting member 14 and the electrode assembly 13 are assembled into the case 11. In order to realize the engagement between the protrusion 143 of the current collecting member 14 and the engaging groove 151 of the first insulating member 15, in some embodiments of the present application, the first insulating member 15 may be covered on the current collecting member 14 and positioned with the engaging groove 151 by the protrusion 143 before the current collecting member 14 and the electrode assembly 13 are assembled into the case 11, and then the first insulating member 15 is assembled into the case 11 together with the current collecting member 14 and the electrode assembly 13; in other embodiments of the present application, when the first insulating member 15 is used to insulate and isolate the electrode terminal 12 and the wall portion 11a, the first insulating member 15 may be installed and the first insulating member 15 is fixed by the electrode terminal 12 and the wall portion 11a, and then the current collecting member 14 and the electrode assembly 13 are installed in the case 11, and the current collecting member 14 and the first insulating member 15 are positioned by the protrusion 143 and the slot 151 being engaged with each other; still alternatively, as shown in fig. 15, in still other embodiments of the present application, the current collecting member 14 and the electrode assembly 13 may be first assembled into the case 11, and then the first insulating member 15 may be formed by injection molding, in which case the shape of the first insulating member 15 forming the groove 142 is determined according to the shape of the current collecting member 14 forming the protrusion 143.

According to the arrangement mode, the first insulating part 15 is provided with the clamping groove 151, and the protrusion 143 is clamped with the clamping groove 151, so that the assembly positioning precision of the current collecting component 14 and the first insulating part 15 during assembly is improved.

Referring to fig. 16, fig. 16 is a schematic view of a battery cell 10 according to some embodiments of the present disclosure. In some embodiments of the present application, the housing 11 includes a casing 111 and an end cover 112, the casing 111 includes a bottom wall 1111 and a side wall 1112, the side wall 1112 is enclosed around the bottom wall 1111, one end of the side wall 1112 is connected to the bottom wall 1111, the other end of the side wall 1112 encloses an opening opposite to the bottom wall 1111, the end cover 112 covers the opening, and the wall portion 11a is the bottom wall 1111 or the end cover 112.

The bottom wall 1111 and the side wall 1112 may be integrally formed, or the bottom wall 1111 and the side wall 1112 may be separately disposed and connected by welding, clamping, or the like. In particular, the sidewall 1112 can be cylindrical, such as a cylinder or prism.

The other end of the side wall 1112 opposite to the bottom wall 1111 encloses an opening from which the current collecting member 14 and the electrode assembly 13 can be mounted into the case 111. After the electrode assembly 13 is fitted into the case 111, the opening is covered with the end cap 112 to close the opening. Further, when the housing 11 needs to be filled with electrolyte and the end cap 112 covers the opening, a sealing member, such as a sealing ring or a gasket, may be disposed between the end cap 112 and the sidewall 1112 to improve the sealing performance of the end cap 112 covering the opening and prevent the electrolyte from leaking from the housing 11.

Wall 11a being either bottom wall 1111 or end cap 112 includes two cases: in one case, the wall 11a is a bottom wall 1111; alternatively, the wall 11a is an end cap 112. In the embodiment in which the wall portion 11a is the bottom wall 1111, the current collecting member 14 faces the bottom wall 1111 after the electrode assembly 13 is mounted in the case 111. In the embodiment where the wall portion 11a is the end cap 112, the current collecting member 14 faces the end cap 112 after the electrode assembly 13 is fitted into the case 111.

In this arrangement, the bottom wall 1111 and the side wall 1112 define a space for accommodating the electrode assembly 13, the electrolyte and other structures, and the opening defined by the side wall 1112 is covered by the end cap 112, thereby ensuring the sealing of the case 11.

Referring to fig. 17 and 18, fig. 17 is a schematic view illustrating the battery cell 10 provided with the reinforcing member 16 according to some embodiments of the present disclosure, and fig. 18 is a partially enlarged view of a portion F according to some embodiments of the present disclosure. In some embodiments of the present application, the battery cell 10 further includes a reinforcement 16, the reinforcement 16 is disposed in the housing 11 and located at a connection between the wall 11a and the sidewall 1112, one end of the reinforcement 16 is connected to the wall 11a, and the other end of the reinforcement 16 is connected to the sidewall 1112.

As shown in fig. 17 and 18, the reinforcement 16 is provided at a connection point between the wall portion 11a and the side wall 1112, the connection point refers to a position where the wall portion 11a and the side wall 1112 are connected, for example, when the wall portion 11a is the bottom wall 1111, the connection point between the wall portion 11a and the side wall 1112 is a corner angle of the connection transition between the bottom wall 1111 and the side wall 1112, and when the wall portion 11a is the end cover 112, the connection point between the wall portion 11a and the side wall 1112 is a position where the end cover 112 is in contact or abutment with the side wall 1112 when the end cover 112 covers the side wall 1112.

It is to be understood that the reinforcement 16 is disposed at the junction of the wall portion 11a and the side wall 1112 such that the reinforcement 16, the wall portion 11a, and the side wall 1112 form a stable triangular structure therebetween, and when the electrode terminal 12 and the wall portion 11a are pressed, the electrode terminal 12 and the wall portion 11a are deformed toward the electrode assembly 13, and the reinforcement 16 transmits a portion of the impact force applied to the wall portion 11a to the side wall 1112, while the reinforcement 16 itself can absorb energy generated by a certain impact.

Specifically, one end of the reinforcement 16 is connected to the wall portion 11a, and the other end of the reinforcement 16 is connected to the side wall 1112, that is, both ends of the reinforcement 16 are connected to the wall portion 11a and the side wall 1112, respectively, and the reinforcement 16 and the wall portion 11a and the reinforcement 16 and the side wall 1112 may be connected by welding, or the reinforcement 16 and the wall portion 11a and the reinforcement 16 and the side wall 1112 may be connected by gluing. The present application does not limit the connection manner between the reinforcing member 16 and the wall portion 11a and the side wall 1112, as long as the reinforcing member 16 can support the wall portion 11a and the side wall 1112, and when the electrode terminal 12 and the wall portion 11a are pressed, the deformation of the wall portion 11a can be prevented, and the deformation amount of the wall portion 11a can be reduced.

Illustratively, the stiffener 16 may be made of a metal material, for example, the stiffener 16 may be made of steel, aluminum, copper, titanium, or an alloy. For example, the reinforcing member 16 may be made of the same material as the housing 11, so that the reinforcing member 16 is connected to the side wall 1112 and the wall 11a of the housing 11 by welding. Alternatively, the reinforcing member 16 may be made of a non-metal material, for example, the reinforcing member 16 may be made of ABS (Acrylonitrile-Butadiene-Styrene), PVC (Polyvinyl Chloride), PP (Polypropylene), and in this case, the reinforcing member 16 may be connected to the side wall 1112 and the wall 11a of the housing 11 by gluing. Of course, the material of the stiffener 16 may also be a composite material, such as carbon fiber.

In this arrangement, the reinforcement 16 is provided between the wall portion 11a and the side wall 1112, so that the amount of deformation of the wall portion 11a toward the current collecting member 14 when the wall portion 11a is pressed is reduced, the risk of overlapping of the current collecting member 14 with the wall portion 11a is further reduced, and the safety of the battery cell 10 is improved.

As shown in fig. 17, in some embodiments of the present application, the reinforcing member 16 is a ring-shaped member disposed around the electrode terminal 12.

Illustratively, when the side wall 1112 of the housing 111 is cylindrical, in order to ensure stability of the connection between the reinforcing member 16 and the side wall 1112, the cross section of the reinforcing member 16 should be circular ring-shaped in the thickness direction of the wall portion 11 a; when the side wall 1112 of the housing 111 has a prism shape, for example, a square shape, the cross section of the reinforcing member 16 should be a square ring shape in the thickness direction of the wall portion 11 a.

With this arrangement, the annular reinforcing member 16 facilitates the connection between the reinforcing member 16 and the side wall 1112 and the wall portion 11a, so that the reinforcing member 16 has a strong connection stability with the side wall 1112 and the wall portion 11 a.

As shown in fig. 17 and 18, in some embodiments of the present application, the battery cell 10 further includes a second insulating member 161, and the second insulating member 161 is wrapped around the reinforcing member 16 on a side thereof facing the current collecting member 14.

It should be understood that when the reinforcing member 16 is made of metal, the reinforcing member 16 has the same polarity as the wall portion 11a and the side wall 1112, and in order to avoid short circuit in the battery cell 10 caused by overlapping of the reinforcing member 16 after deformation of the current collecting member 14, the current collecting member 14 and the reinforcing member 16 should be insulated and isolated, for example, the reinforcing member 16 is covered with the second insulating member 161 on the side facing the current collecting member 14.

Optionally, the second insulating member 161 may be made of plastic, such as PVC (Polyvinyl Chloride), PP (Polypropylene), etc., or the second insulating member 161 may also be made of rubber, such as butyl rubber, styrene butadiene rubber, silicone rubber, etc.

With such an arrangement, the second insulating member 161 is provided to reduce the risk that the electrode terminal 12 overlaps the reinforcing member 16 when the current collecting member 14 is folded and warped toward the wall portion 11a due to the electrode terminal 12 pressing the current collecting member 14, thereby preventing the internal short circuit of the battery cell 10 and improving the safety of the battery cell 10.

As shown in fig. 16, in some embodiments of the present application, the electrode assembly 13 further includes a second tab 133, the second tab 133 is formed at an end of the main body 132 away from the wall portion 11a, the second tab 133 is opposite in polarity to the first tab 131, and the second tab 133 is electrically connected to the wall portion 11 a.

As shown in fig. 16, the first tab 131 is located at one end of the electrode assembly 13 toward the wall portion 11a, and the second tab 133 is located at one end of the electrode assembly 13 away from the wall portion 11a, i.e., the first tab 131 and the second tab 133 are respectively formed at both ends of the body 132 of the electrode assembly 13.

The first tab 131 is opposite in polarity to the second tab 133, and for example, the first tab 131 is a positive tab of the electrode assembly 13, is formed of a portion of the positive tab having no active material, and is electrically connected to the current collecting member 14 and the electrode terminal 12, and the second tab 133 is a negative tab of the electrode assembly 13, is formed of a portion of the negative tab having no active material, and is electrically connected to the case 11 and the wall portion 11 a.

According to the arrangement mode, the first lug 131 and the second lug 133 are located at two ends of the electrode assembly 13, and the first lug 131 and the second lug 133 have good insulativity, so that the risk of short circuit in the single battery 10 is reduced, and the safety of the single battery 10 is improved.

In a second aspect, the present application also provides a battery 100, where the battery 100 includes the battery cell 10 described above. When the electrode terminal 12 and the wall 11a of the battery cell 10 are pressed, the amount of deformation of the current collecting member 14 is small, and the current collecting member is not easily folded and warped toward the wall 11a, which provides high safety. Therefore, the battery 100 using the battery cell 10 also has high safety.

In a third aspect, the present application further provides an electric device, which includes the battery 100 described above, and the battery 100 is used for providing electric energy. The electric device may be any one of the above devices or systems using the battery 100.

As shown in fig. 3-18, in some embodiments of the present application, the present application provides a battery cell 10. The battery cell 10 includes a case 11, electrode terminals 12, an electrode assembly 13, and a current collecting member 14. The case 11 includes a wall portion 11a, and the electrode terminal 12 is mounted on the wall portion 11a in an insulated manner. The electrode assembly 13 is disposed in the case 11, and the electrode assembly 13 includes a main body 132 and a first tab 131, and the first tab 131 is formed at one end of the main body 132 near the wall portion 11 a. The current collecting member 14 is disposed between the electrode assembly 13 and the wall 11a, for example, the current collecting member 14 is disposed between the first tab 131 and the wall 11a, and the current collecting member 14 serves to connect the first tab 131 and the electrode terminal 12. Wherein the current collecting member 14 includes a first surface 141 facing the wall portion 11a, the first surface 141 is formed with a groove 142, and a portion of the electrode terminal 12 is received in the groove 142 and abuts against a side wall 1112 of the groove 142. The wall 11a is provided with an electrode lead-out hole 11b, the electrode terminal 12 includes a terminal body 121 and a first flange 122, the terminal body 121 is inserted into the electrode lead-out hole 11b, the first flange 122 protrudes from the outer peripheral surface of the terminal body 121 along the radial direction of the terminal body 121, the first flange 122 is located inside the wall 11a, at least a portion of the first flange 122 is accommodated in the groove 142, and the outer peripheral surface of the first flange 122 abuts against the side wall 1112 of the groove 142.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, comprising:

a housing including a wall portion;

an electrode terminal mounted on the wall portion in an insulated manner;

an electrode assembly disposed within the case, the electrode assembly including a main body and a first tab formed at one end of the main body adjacent to the wall portion;

a current collecting member disposed between the first tab and the wall portion for connecting the first tab and the electrode terminal;

wherein the current collecting member includes a first surface facing the wall portion, the first surface being formed with a groove, a portion of the electrode terminal being received in the groove and abutting against a sidewall of the groove.

2. The battery cell as recited in claim 1, wherein the wall portion is provided with an electrode lead-out hole, the electrode terminal includes a terminal body and a first flange, the terminal body is inserted into the electrode lead-out hole, the first flange protrudes beyond an outer circumferential surface of the terminal body in a radial direction of the terminal body, the first flange is located inside the wall portion to restrict the electrode terminal from moving in a direction away from the electrode assembly, at least a portion of the first flange is received in the groove, and the outer circumferential surface of the first flange abuts against a side wall of the groove.

3. The battery cell as recited in claim 2, wherein the electrode terminal further comprises an extension extending from an outer peripheral surface of the first flange in a radial direction of the terminal body, the extension covering at least a portion of the first surface.

4. The battery cell of claim 3, wherein the extension covers the entire first surface.

5. The battery cell as recited in claim 2, wherein the electrode terminal further includes a second flange protruding from an outer circumferential surface of the terminal body in a radial direction of the terminal body, the second flange being located outside the wall portion to restrict movement of the electrode terminal in a direction toward the electrode assembly.

6. The battery cell of claim 1, further comprising:

a first insulator disposed between the current collecting member and the wall portion for insulating and isolating the current collecting member and the wall portion;

wherein, the first surface is also provided with a bulge, and the bulge is used for supporting the first insulating part.

7. The battery cell according to claim 6, wherein the protrusion is an annular protrusion provided around the electrode terminal;

or, the number of the projections is multiple, and the projections are distributed around the electrode terminal at intervals.

8. The battery cell as claimed in claim 6, wherein the first insulating member is provided with a locking groove, and the protrusion is locked with the locking groove.

9. The battery cell of any of claims 1-8, wherein the housing comprises a casing and an end cap, the casing comprising a bottom wall and a side wall, the side wall being disposed around the bottom wall, one end of the side wall being connected to the bottom wall, the other end of the side wall defining an opening opposite the bottom wall, the end cap covering the opening, the wall being the bottom wall or the end cap.

10. The battery cell of claim 9, further comprising:

the reinforcing piece is arranged in the shell and located at the joint of the wall part and the side wall, one end of the reinforcing piece is connected to the wall part, and the other end of the reinforcing piece is connected to the side wall.

11. The battery cell according to claim 10, wherein the reinforcing member is an annular member disposed around the electrode terminal.

12. The battery cell as recited in claim 10, further comprising a second insulator that is wrapped around a side of the reinforcing member that faces the current collecting member.

13. The battery cell of any of claims 1-8, wherein the electrode assembly further comprises a second tab formed at an end of the body distal from the wall portion, the second tab being opposite in polarity to the first tab, the second tab being electrically connected to the wall portion.

14. A battery comprising a cell according to any one of claims 1 to 13.

15. An electrical device comprising a battery according to claim 14 for providing electrical energy.