CN220066024U - Battery monomer, battery and electric equipment - Google Patents

Abstract

The utility model relates to a battery monomer, a battery and electric equipment. The battery cell includes: a housing having an opening; the battery cell assembly is arranged in the shell; the current collecting disc is positioned on one side of the battery cell assembly, facing the opening, and is electrically connected with the battery cell assembly, the peripheral edge of the current collecting disc is in interference fit with the inner wall of the shell, and a through hole is formed in the current collecting disc; and the cover plate is provided with an explosion-proof area and a non-explosion-proof area surrounding the explosion-proof area, an explosion-proof notch positioned between the explosion-proof area and the non-explosion-proof area is arranged on the cover plate, the cover plate is positioned at the opening and is connected with the current collecting disc through the non-explosion-proof area, and the penetrating hole is positioned in the orthographic projection range of the explosion-proof area on the plane where the current collecting disc is positioned. In this way, the through hole is positioned in the orthographic projection range of the explosion-proof area on the plane where the current collecting disc is positioned, and the part near the through hole of the current collecting disc can press the cell assembly, so that the risk that when the cell assembly is in thermal runaway, the part of the cell assembly is sprayed outwards from the broken explosion-proof area is greatly reduced.

Description

Battery monomer, battery and electric equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

Batteries are widely used in various devices such as cellular phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like. The battery cell is an important component of the battery and generally comprises a shell, an end cover and a battery cell assembly, wherein the battery cell assembly is accommodated in the shell, and the end cover seals the opening of the shell. When thermal runaway occurs, the battery cell assembly can generate a large amount of gas and heat, and the explosion-proof structure on the end cover breaks and releases pressure under the action of high pressure or high temperature.

However, the battery cell assembly includes a winding core formed by winding a positive electrode sheet, a negative electrode sheet, and a separator. When the explosion-proof structure breaks and pressure is relieved, the pole piece and the diaphragm in the middle of the winding core are easily ejected from the breaking position of the explosion-proof structure.

Disclosure of Invention

Based on the above, it is necessary to provide a battery cell, a battery and electric equipment for improving the above defects, aiming at the problem that the pole piece and the diaphragm in the middle of the winding core are easily ejected from the rupture part of the explosion-proof structure when the explosion-proof structure is ruptured and depressurized in the prior art.

A battery cell comprising:

a housing having an opening;

the battery cell assembly is arranged in the shell;

the current collecting disc is positioned at one side of the electric core assembly, facing the opening, and is electrically connected with the electric core assembly, the peripheral edge of the current collecting disc is in interference fit with the inner wall of the shell, and a through hole is formed in the current collecting disc; a kind of electronic device with high-pressure air-conditioning system

The cover plate is provided with an explosion-proof area and a non-explosion-proof area surrounding the explosion-proof area, an explosion-proof notch positioned between the explosion-proof area and the non-explosion-proof area is arranged on the cover plate, the cover plate is positioned at the opening and is connected with the current collecting disc through the non-explosion-proof area, and the through hole is positioned in the orthographic projection range of the explosion-proof area on the plane where the current collecting disc is positioned.

In one embodiment, the non-explosion-proof area is provided with a first protruding strip protruding towards the current collecting disc, and the first protruding strip is attached to the current collecting disc, so that penetration welding is performed on the first protruding strip and the current collecting disc by the side, away from the current collecting disc, of the non-explosion-proof area.

In one embodiment, the first raised strip is annular and is distributed around the explosion-proof area.

In one embodiment, the first protruding strips comprise a plurality of sections, and the plurality of sections of the first protruding strips are distributed at intervals along the direction surrounding the explosion-proof area.

In one embodiment, the current collecting tray is provided with a second protruding strip protruding towards the cover plate, and the second protruding strip is attached to the first protruding strip, so that penetration welding is performed on the first protruding strip and the second protruding strip by one side, away from the current collecting tray, of the non-explosion-proof area.

In one embodiment, the collecting tray has an annular reinforcing part disposed around the through-hole, the annular reinforcing part being located at a peripheral edge of the through-hole for reinforcing rigidity of the collecting tray.

In one embodiment, the annular reinforcing part comprises an annular groove and an annular protrusion, and the current collecting disc protrudes outwards from one side close to the battery cell assembly to one side close to the cover plate, so that the annular groove is formed on one side of the current collecting disc close to the battery cell assembly, and the annular protrusion is formed on one side of the current collecting disc close to the cover plate.

In one embodiment, the current collecting disc is further provided with a hollowed-out groove located in a side area of the annular reinforcing part, which is away from the through hole, and the hollowed-out groove penetrates through two opposite sides of the current collecting disc.

In one embodiment, the number of the hollow grooves is multiple, and the plurality of the hollow grooves are distributed at intervals along the circumferential direction of the annular reinforcing part;

each hollow groove is in a V shape, the opening end of each hollow groove is close to the peripheral edge of the current collecting disc, and the closed end of each hollow groove is close to the annular reinforcing part.

A battery comprising a battery cell as described in any one of the embodiments above.

A powered device comprising a battery cell as described in any of the embodiments above or a battery as described in any of the embodiments above.

Above-mentioned battery monomer, battery and consumer, because the apron passes through non-explosion-proof district and mass flow dish is fixed, the periphery edge of mass flow dish and the inner wall interference fit of casing to make apron, mass flow dish and casing three fixed into a whole. And in addition, the penetrating hole is positioned in the orthographic projection range of the explosion-proof area on the plane where the current collecting disc is positioned, namely, the radial size of the penetrating hole is smaller than that of the explosion-proof area, and the part near the penetrating hole of the current collecting disc can press the cell assembly, so that the risk that when the cell assembly is out of control, the part of the cell assembly is sprayed outwards from the broken explosion-proof area is greatly reduced.

Drawings

Fig. 1 is a schematic structural diagram of a battery cell according to an embodiment of the present utility model (the explosion-proof score is in an un-exploded state);

fig. 2 is a schematic structural view of the battery cell shown in fig. 1 (explosion-proof score in a burst state);

fig. 3 is an exploded view of the battery cell shown in fig. 1;

fig. 4 is an exploded view of the cell assembly, current collecting plate and cover plate of the battery cell of fig. 1;

fig. 5 is a front view of a cap plate of the battery cell shown in fig. 1;

fig. 6 is a cross-sectional view of the battery cell shown in fig. 1;

fig. 7 is a partial enlarged view of the battery cell shown in fig. 6 at an end of the case having an opening;

fig. 8 is a schematic structural view of a current collecting plate of the battery cell shown in fig. 1.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

In one embodiment of the utility model, a battery is provided that 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 utility model may include a battery module, a battery pack, or the like. In particular, the battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells. Specifically, in the battery, the number of the battery cells may be one or more. If the number of the battery cells is multiple, the multiple battery cells can be connected in series or in parallel or in series-parallel connection, and the series-parallel connection means that the multiple battery cells are connected in series or in parallel. The battery modules can be formed by connecting a plurality of battery monomers in series or in parallel or in series-parallel connection, and the battery modules are connected in series or in parallel or in series-parallel connection to form a whole and are accommodated in the box body. Or all the battery cells can be directly connected in series or in parallel or in series-parallel, and then the whole formed by all the battery cells is accommodated in the box body.

Alternatively, the battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium ion battery cell, or a magnesium ion battery cell, which is not limited by the embodiment of the utility model. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the utility model. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft package battery cell are not limited in this embodiment.

Referring to fig. 1 to 4, an embodiment of the utility model provides a battery cell, which includes a housing 10, a cell assembly 20, a current collecting plate 30 and a cover plate 40. The housing 10 has an opening 11, and the cell assembly 20 is disposed within the housing 10 through the opening 11. The current collecting plate 30 is located at a side of the cell assembly 20 facing the opening 11 and is electrically connected with the tab of the cell assembly 20. The peripheral edge of the current collecting plate 30 is in interference fit with the inner wall of the case 10, so that the current collecting plate 30 is fixedly and electrically connected with the case 10, that is, the tabs of the cell assembly 20, the current collecting plate 30 and the case 10 are sequentially electrically connected, so that the case 10 serves as one electrode of the battery cell. The cover plate 40 includes an explosion-proof area 41 and a non-explosion-proof area 42 surrounding the explosion-proof area 41. The cover plate 40 is provided with an explosion-proof score 43 located between the explosion-proof area 41 and the non-explosion-proof area 42. A cover plate 40 is located at the opening 11 and is connected to the collector plate 30 by a non-explosion-proof area 42, i.e. the cover plate 40 is integrally connected to the collector plate 30 by the non-explosion-proof area 42. The current collecting disc 30 is provided with a through hole 31, and the through hole 31 is positioned in the orthographic projection range of the explosion-proof area 41 on the plane of the current collecting disc 30, so that high-pressure air flow or jet generated when the electric core assembly 20 is in thermal runaway can be jetted to the explosion-proof area 41 of the cover plate 40 through the through hole 31 on the current collecting disc 30, and the cover plate 40 is broken along the explosion-proof nick 43 to realize pressure relief.

In this way, since the cover plate 40 is fixed to the collecting tray 30 through the non-explosion-proof area 42, the peripheral edge of the collecting tray 30 is in interference fit with the inner wall of the case 10, so that the cover plate 40, the collecting tray 30 and the case 10 are fixed as a whole. In addition, the through holes 31 are located in the orthographic projection range of the explosion-proof area 41 on the plane of the current collecting disc 30, that is, the radial dimension of the through holes 31 is smaller than that of the explosion-proof area 41, and the parts near the through holes 31 of the current collecting disc 30 can press the cell assembly 20, so that the risk that when the cell assembly 20 is out of control, part of the cell assembly 20 is sprayed outwards from the broken explosion-proof area 41 is greatly reduced.

It should be noted that, because the cell assembly 20 is limited by the current collecting plate 30, a portion of the cell assembly 20 is not ejected from the explosion-proof area 41 of the cover plate 40, and thus the area of the explosion-proof area 41 is expanded as much as possible. The area of the explosion-proof area 41 is increased, so that the larger the pressure of high-pressure airflow or jet is born, the sensitivity of explosion-proof area 41 in explosion pressure relief along the explosion-proof notch 43 is greatly improved, and the explosion-proof area 41 can more timely in explosion pressure relief along the explosion-proof notch 43 when the electric core assembly 20 is in thermal runaway, so that explosion caused by time delay pressure relief is avoided.

It should be noted that, because the current collecting disc 30 is in interference fit with the inner wall of the casing 10, the fixing with the casing 10 is achieved, and meanwhile, the effect of positioning the current collecting disc 30 by using the inner wall of the casing 10 is achieved, so that the concentricity of the current collecting disc 30 and the casing 10 is ensured to be better, and the assembly requirement is met.

The size of the through hole 31 in the current collecting plate 30 cannot be too large or too small. When the through-hole 31 is too large, the current collecting plate 30 cannot effectively press the cell assembly 20, so that the cell assembly 20 easily passes through the through-hole 31 and is ejected from the burst explosion-proof area 41 when thermal runaway occurs; when the through hole 31 is too small, high-pressure air flow or spray generated by the cell assembly 20 cannot rapidly pass through the through hole 31 to act on the explosion-proof area 41 of the cover plate 40 when thermal runaway occurs, so that the explosion-proof area 41 of the cover plate 40 is delayed to burst and release pressure. To overcome this drawback, in some embodiments, the cell assembly 20 has a central hole 21, the center of which central hole 21 is collinear with (i.e., coaxial with) the center of the through hole 31 on the collecting tray 30, and the radial dimension of the through hole 31 is slightly greater than that of the central hole 21, so that, when thermal runaway occurs in the cell assembly 20, on the one hand, the size of the through hole 31 is capable of satisfying the requirements of high-pressure air flow or jet passing through and acting on the explosion-proof area 41 of the cover plate 40; on the other hand, the effect of pressing the cell assembly 20 to prevent part of the cell assembly 20 from being ejected from the burst explosion-proof area 41 can be achieved. Further, the center hole 21 of the cell assembly 20, the through hole 31 of the current collecting plate 30 and the explosion-proof area 41 of the cover plate 40 are coaxially arranged, that is, the centers of the center hole 21 of the cell assembly 20, the through hole 31 of the current collecting plate 30 and the explosion-proof area 41 of the cover plate 40 are collinear.

Optionally, the cover plate 40 is welded to the housing 10, so as to enhance the fixing strength of the cover plate 40 and the current collecting plate 30 to the housing 10, and prevent the cover plate 40 and the current collecting plate 30 from being ejected from the opening 11 of the housing 10 under the action of high-pressure air flow or jet when the thermal runaway of the battery cell assembly 20 occurs. Further, the peripheral edge of the cover plate 40 is continuously welded with the casing 10, so that on one hand, the fixing connection strength of the cover plate 40 and the current collecting disc 30 with the casing 10 is enhanced, and on the other hand, the opening 11 of the casing 10 is sealed, and electrolyte in the casing 10 is prevented from leaking out from the opening 11.

In an embodiment of the present utility model, the cell assembly 20 is composed of a positive electrode sheet, a negative electrode sheet, and an isolating film. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. 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 electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The material of the separator may be polypropylene (PP) or Polyethylene (PE). In addition, the cell assembly 20 may be a winding type structure or a lamination type structure, and the embodiment of the present utility model is not limited thereto.

Alternatively, the material of the case 10 and the cover 40 may be steel. The material of the current collecting plate 30 may be copper, and the outer surface of the current collecting plate 30 has a nickel plating layer. Of course, in other embodiments, other conductive materials may be used for the housing 10, the cover plate 40, and the current collecting plate 30, which are not limited herein.

Specifically, the battery cell further includes an electrode terminal 50 (see fig. 6), and the electrode terminal 50 is disposed on the case 10 in an insulating manner and electrically connected to the cell assembly 20, such that the electrode terminal 50 serves as another electrode of the battery cell and has a polarity opposite to that of the case 10, i.e., the electrode terminal 50 and the case 10 together serve as both positive and negative stages of the battery cell to achieve power input or output of the battery cell.

Optionally, the current collecting plate 30 is electrically connected to the negative electrode tab of the cell assembly 20, so that the housing 10 is the negative electrode of the battery cell. The electrode terminal 50 is electrically connected with the positive electrode tab of the cell assembly 20 such that the electrode terminal 50 serves as the positive electrode of the battery cell. Of course, in other embodiments, the case 10 may also be used as a positive electrode of a battery cell, and the electrode terminal 50 may be used as a negative electrode of the battery cell, which is not limited herein. The assembly structure of the electrode terminal 50 and the case 10 may be a well-known structure, and is not limited thereto.

Referring to fig. 4, 5 and 7, in the embodiment of the utility model, the non-explosion-proof area 42 has a first protruding strip 44 protruding toward the current collecting tray 30, and the first protruding strip 44 is attached to the current collecting tray 30, so that the non-explosion-proof area 42 of the cover plate 40 is separated from the current collecting tray 30 to perform penetration welding on the first protruding strip 44 and the current collecting tray 30. In this way, the first protruding strip 44 contacts with the current collecting tray 30, and penetration welding is performed on the outer side of the cover plate 40, so that the first protruding strip 44 of the cover plate 40 and the current collecting tray 30 are welded into a whole, on one hand, good contact between the first protruding strip 44 of the cover plate 40 and the current collecting tray 30 is ensured when welding is performed, and the welding quality is improved; on the other hand, the welding is performed outside the cover 40, so that metal dust generated during the welding is prevented from entering the inside of the case 10. It should be noted that, the first protruding strip 44 provided in the non-explosion-proof area 42 of the cover 40 may also play a role in enhancing the rigidity of the cover 40, so as to reduce the risk of deformation of the cover 40 due to welding stress.

Alternatively, the first ridge 44 is in the form of a ring disposed around the explosion-proof area 41. So, utilize the first sand grip 44 and the mass flow plate 30 welded fastening in the explosion-proof district 41 outside, welded fastening is effectual to the required space that occupies of reducible welding, and then the area in the explosion-proof district 41 of increase as far as possible is favorable to promoting explosion-proof district 41 and bursts the sensitivity of pressure release along explosion-proof nick 43, even make explosion-proof district 41 can be more timely burst along explosion-proof nick 43 pressure release when electric core assembly 20 takes place thermal runaway, avoid taking place the explosion because of delaying burst pressure release.

Further, the non-explosion-proof area 42 of the cover plate 40 protrudes from a side facing away from the current collecting plate 30 toward a side adjacent to the current collecting plate 30 to form a first groove 48 (see fig. 7) on a side of the non-explosion-proof area 42 of the cover plate 40 facing away from the current collecting plate 30, and the above-mentioned first protrusion 44 is formed on a side of the non-explosion-proof area 42 of the cover plate 40 adjacent to the current collecting plate 30. It will be appreciated that the weld 45, which is a penetration weld between the first rib 44 and the current collector plate 30, is located within the first recess 48. Alternatively, the first protruding strip 44 may be formed by stamping.

Further, the first protruding strip 44 includes a plurality of segments, and the plurality of segments of the first protruding strip 44 are arranged at intervals along the direction surrounding the explosion-proof area 41. In this way, the first protruding strips 44 are designed into multiple sections which are distributed at intervals, so that on one hand, the difficulty of stamping and forming is reduced, and on the other hand, stress is released, and buckling deformation of the cover plate 40 is avoided. In particular, in the embodiment shown in fig. 5, the first ribs 44 include six segments of the first ribs 44 that are equally spaced along the circumferential direction of the cover plate 40. The number of the first protrusions 44 is not limited to six, but is not limited thereto.

Referring to fig. 6 to 8, in the embodiment, the current collecting tray 30 has a second protruding strip 33 protruding toward the cover plate 40, and the second protruding strip 33 is attached to a first protruding strip 44 on the cover plate 40, so that the first protruding strip 44 and the second protruding strip 33 are penetration welded from a side of the non-explosion-proof area 42 facing away from the current collecting tray 30. In this way, the first protruding strip 44 protruding toward the current collecting tray 30 on the cover plate 40 and the second protruding strip 33 protruding toward the cover plate 40 on the current collecting tray 30 are attached to each other, so that when the first protruding strip 44 and the second protruding strip 33 are penetration welded from the outer side of the cover plate 40, the first protruding strip 44 and the second protruding strip 33 are tightly attached, and the welding quality of the two is improved. It will be appreciated that the provision of the second protrusions 33 on the manifold disc 30 also has the effect of reinforcing the rigidity of the manifold disc 30, thereby reducing the risk of deformation of the manifold disc 30 due to welding stresses.

Further, the current collecting plate 30 protrudes from a side near the cell assembly 20 to a side near the cover plate 40 to form a second groove 36 (see fig. 7) on a side of the current collecting plate 30 near the cell assembly 20, and the second protrusion 33 is formed on a side of the current collecting plate 30 near the cover plate 40. Alternatively, the second protruding strip 33 may be formed by stamping.

It should be noted that, since the current collecting plate 30 is located in the vicinity of the peripheral edge of the through hole 31 and has weak rigidity, when the thermal runaway occurs in the battery cell, the peripheral edge of the through hole 31 is easily turned over or bent and deformed toward the cover plate 40 under the high pressure, so that a portion of the battery cell assembly 20 passes through the through hole 31 and is ejected from the burst explosion-proof area 41. In order to further reduce the risk of the cell assembly 20 being ejected from the burst explosion-proof area 41, in particular, in an embodiment, the current collecting plate 30 further has an annular reinforcement 32 arranged around the through hole 31, the annular reinforcement 32 being located at the peripheral edge of the through hole 31 for reinforcing the rigidity of the current collecting plate 30. In this way, the annular reinforcing part 32 is provided at the peripheral edge of the through hole 31, so that the rigidity of the peripheral edge of the through hole 31 is enhanced, the occurrence of flanging or bending deformation of the peripheral edge of the through hole 31 toward the cover plate 40 under the action of high pressure when the thermal runaway of the cell assembly 20 occurs is avoided, and the risk that the cell assembly 20 passes through the through hole 31 and is ejected from the burst explosion-proof region 41 is greatly reduced.

Further, the annular reinforcing portion 32 includes an annular groove 321 (see fig. 7) and an annular projection 323 (see fig. 7). The current collecting plate 30 protrudes from the side near the cell assembly 20 to the side near the cover plate 40 to form the annular groove 321 at the side of the current collecting plate 30 near the cell assembly 20, and form the annular protrusion 323 at the side of the current collecting plate 30 near the cover plate 40. Thus, on the one hand, the peripheral edge region of the through-hole 31 of the current collecting plate 30 is reinforced; on the other hand, the cell assembly 20 will expand to a certain extent during the electrolyte infiltration and subsequent use, so that a portion of the cell assembly 20 fills the annular groove 321, thereby positioning a portion of the cell assembly 20 near the through hole 31, and further avoiding that the cell assembly 20 passes through the through hole 31 under the high voltage effect and is ejected from the burst explosion-proof area 41 when the cell assembly 20 is in thermal runaway. Alternatively, the annular reinforcement 32 may be formed by stamping.

In the embodiment, the current collecting plate 30 further has a hollow groove 34 formed between the annular reinforcing portion 32 and the second protruding strip 33. The hollow grooves 34 penetrate through opposite sides of the current collecting plate 30, that is, the hollow grooves 34 penetrate through one side of the current collecting plate 30 close to the cell assembly 20 and one side close to the cover plate 40, so that high-pressure air flow or jet can simultaneously penetrate through the through holes 31 and the hollow grooves 34 when the cell assembly 20 is thermally out of control, and impact the explosion-proof area 41 of the cover plate 40, and the explosion-proof area 41 can timely burst along the explosion-proof notch 43 for pressure relief. In this way, the hollowed-out groove 34 enables high-pressure air flow or jet to quickly pass through the collecting disc 30 and act on the explosion-proof area 41 of the cover plate 40, so that the explosion-proof area 41 can timely burst and release pressure along the explosion-proof notch 43, and the phenomenon that the pressure acting on the collecting disc 30 is too high to cause the collecting disc 30 and the cover plate 40 to be integrally sprayed out of the opening 11 of the shell 10 is avoided.

Optionally, the number of the hollow grooves 34 is plural, and the plural hollow grooves 34 are distributed at intervals along the circumferential direction of the annular reinforcing portion 32. Each hollow groove 34 is in a V shape, the opening end 341 of each hollow groove 34 is close to the second raised line 33, and the closed end 342 of each hollow groove 34 is close to the annular reinforcing part 32, so that each hollow groove 34 plays a role in guiding the high-pressure air flow or the jet to the middle part when the high-pressure air flow or the jet passes through, the high-pressure air flow or the jet has a tendency to gather to the middle part, more high-pressure air flows or the jet acts on the explosion-proof area 41 of the cover plate 40, and the explosion-proof area 41 is ensured to be timely subjected to burst pressure relief along the explosion-proof notch 43.

In the embodiment shown in fig. 8, six V-shaped hollow grooves 34 are formed in the current collecting plate 30, and the six hollow grooves 34 are equally spaced along the circumference of the through hole 31. Of course, the number of the hollow grooves 34 is not limited to six, but is not limited thereto.

In the embodiment of the present utility model, the circumferential side edge of the current collecting plate 30 forms the tight fitting portion 35 toward the same side edge of the current collecting plate 30. The tight fitting portion 35 is in interference fit with the inner wall of the housing 10. In this way, the tight-fit portion 35 formed by the flanging is in interference fit with the inner wall of the shell 10, so that the contact area of the tight-fit portion and the shell 10 is greatly increased, and the fastening degree of the current collecting disc 30 and the shell 10 is improved.

Further, the opening 11 of the housing 10 is provided with a chamfer 12 (see fig. 7), so that the chamfer 12 at the opening 11 of the housing 10 plays a guiding role in guiding the tight fitting part 35 into the housing 10 in the process that the battery cell assembly 20 and the current collecting disc 30 as a whole enter the interior of the housing 10 from the opening 11 (i.e. a housing-in process), thereby enabling the current collecting disc 30 to be more smoothly housed. Alternatively, the chamfer 12 may be rounded or beveled.

Further, the fitting portion 35 includes a plurality of segments, and the plurality of segments of the fitting portion 35 are arranged at intervals along the circumferential direction of the current collecting plate 30. In this way, the tight-fit part 35 is designed into multiple sections, so that on one hand, the molding difficulty of the flanging process is conveniently reduced, and on the other hand, the stress generated in the flanging process is released, and the defects of warping and the like of the current collecting disc 30 are avoided. In particular, in the embodiment shown in fig. 8, the number of the tight-fitting parts 35 is six, and the six tight-fitting parts 35 are arranged at equal intervals along the circumferential direction of the cover plate 30. The number of the tight-fitting portions 35 is not limited to six, but is not limited thereto.

Based on the battery, the utility model further provides electric equipment. The powered device includes a battery or battery cell as described in any of the embodiments above, with the powered device utilizing the battery or battery cell as a power source. In particular, the electrical consumer may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the utility model does not limit the electric equipment in particular.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (11)

1. A battery cell, comprising:

a housing (10) having an opening (11);

a battery cell assembly (20) housed in the housing (10);

the current collecting disc (30) is positioned on one side of the cell assembly (20) facing the opening (11) and is electrically connected with the cell assembly (20), the peripheral edge of the current collecting disc (30) is in interference fit with the inner wall of the shell (10), and a through hole (31) is formed in the current collecting disc (30); a kind of electronic device with high-pressure air-conditioning system

A cover plate (40) provided with an explosion-proof area (41) and a non-explosion-proof area (42) surrounding the explosion-proof area (41), wherein an explosion-proof notch (43) positioned between the explosion-proof area (41) and the non-explosion-proof area (42) is arranged on the cover plate (40);

the cover plate (40) is located at the opening (11) and is connected with the collecting disc (30) through the non-explosion-proof area (42), and the through hole (31) is located in the orthographic projection range of the explosion-proof area (41) on the plane where the collecting disc (30) is located.

2. The battery cell according to claim 1, wherein the non-explosion-proof area (42) has a first protruding strip (44) protruding toward the current collecting plate (30), the first protruding strip (44) being attached to the current collecting plate (30) so that penetration welding is performed between the first protruding strip (44) and the current collecting plate (30) by a side of the non-explosion-proof area (42) facing away from the current collecting plate (30).

3. The battery cell according to claim 2, wherein the first bead (44) has a ring shape disposed around the explosion-proof area (41).

4. A battery cell according to claim 3, wherein the first ribs (44) comprise a plurality of segments, the segments of the first ribs (44) being spaced apart in a direction around the explosion-proof area (41).

5. The battery cell according to claim 3 or 4, wherein the current collecting plate (30) has a second protruding strip (33) protruding toward the cover plate (40), and the second protruding strip (33) is attached to the first protruding strip (44) so that penetration welding is performed between the first protruding strip (44) and the second protruding strip (33) from a side of the non-explosion-proof area (42) facing away from the current collecting plate (30).

6. The battery cell according to claim 1, wherein the current collecting plate (30) has an annular reinforcing part (32) disposed around the through-hole (31), the annular reinforcing part (32) being located at a peripheral side edge of the through-hole (31) for reinforcing rigidity of the current collecting plate (30).

7. The battery cell according to claim 6, wherein the annular reinforcement (32) comprises an annular groove (321) and an annular protrusion (323); the current collecting disc (30) protrudes outwards from one side close to the battery cell assembly (20) to one side close to the cover plate (40) so as to form the annular groove (321) on one side of the current collecting disc (30) close to the battery cell assembly (20), and form the annular protrusion (323) on one side of the current collecting disc (30) close to the cover plate (40).

8. The battery cell according to claim 6, wherein the current collecting plate (30) is further provided with a hollowed-out groove (34) located in a side area of the annular reinforcing part (32) away from the through hole (31), and the hollowed-out groove (34) penetrates through two opposite sides of the current collecting plate (30).

9. The battery cell according to claim 8, wherein the hollowed-out grooves (34) are provided in a plurality, and the hollowed-out grooves (34) are arranged at intervals along the circumferential direction of the annular reinforcing part (32);

each hollow groove (34) is in a V shape, an opening end (341) of each hollow groove (34) is close to the peripheral edge of the current collecting disc (30), and a closed end (342) of each hollow groove (34) is close to the annular reinforcing part (32).

10. A battery comprising a battery cell according to any one of claims 1 to 9.

11. A powered device comprising a battery cell according to any one of claims 1 to 9 or a battery according to claim 10.