Battery cell, battery, and electrical device

Abstract

A battery cell (100), a battery (200), and an electrical device (300). The battery cell (100) comprises: a casing (10); a pressure relief structure (20) mounted on the casing (10); an electrode assembly (30) disposed in the casing (10); an insulating member disposed in the casing (10) and located between the casing (10) and the electrode assembly (30); and a blocking component (40) disposed in the casing (10) and located between the pressure relief structure (20) and the electrode assembly (30). The blocking component (40) is insulated from the casing (10), a through hole (41) is disposed at a position of the blocking component (40) opposite to the pressure relief structure (20), and the melting point of the blocking component (40) is higher than the melting point of the insulating member.

Description

Battery cells, batteries and electrical equipment Technical Field

[0001] This application relates to the field of battery equipment technology, specifically to a battery cell, a battery, and an electrical device. Background Technology

[0002] A battery typically consists of multiple individual cells assembled within a casing and electrically connected via series, parallel, or mixed connection methods. During use, external environmental factors or the aging of the individual cells can cause thermal runaway, leading to battery damage.

[0003] When a battery cell experiences thermal runaway, high-temperature, high-pressure flue gas is generated inside the cell. The electrode plates of the cell's electrode assembly may also fracture, producing large electrode fragments. These fragments are ejected from the pressure relief structure along with the high-temperature, high-pressure flue gas. When this flue gas comes into contact with air, the hot electrode fragments, which are carried within the ejected gas, can ignite the flue gas, potentially leading to an explosion.

[0004] Summary of the Invention

[0005] The purpose of this application is to provide a battery cell, a battery, and an electrical device, including but not limited to solving the problem in the related art that electrode fragments ejected along with the flue gas when a battery cell experiences thermal runaway may ignite the flue gas.

[0006] The technical solution adopted in the embodiments of this application is:

[0007] According to a first aspect of this application, a battery cell is provided, comprising:

[0008] case;

[0009] Pressure relief structure, installed on the housing;

[0010] Electrode assembly, housed within the housing;

[0011] An insulating element is disposed within the housing and located between the housing and the electrode assembly to insulate the housing from the electrode assembly;

[0012] An intercepting component is disposed within a housing and located between a pressure relief structure and an electrode assembly. The intercepting component is insulated from the housing. At least one through hole is provided at a position opposite to the pressure relief structure of the intercepting component. Furthermore, the melting point of the intercepting component is higher than that of the insulating component.

[0013] The battery cell provided by the application is provided with an intercepting component in the accommodating space of the battery cell, and the intercepting component is located between the pressure relief structure and the electrode assembly. Thus, when the battery cell is in thermal runaway, the smoke can flow from the through holes of the intercepting component to the pressure relief structure and be sprayed out, and the large-volume electrode tab fragments mixed in the smoke are intercepted by the intercepting component, so that the electrode tab fragments cannot pass through the intercepting plate and reach the pressure relief structure. In this way, the electrode tab fragments mixed in the smoke sprayed out from the inside of the battery cell to the pressure relief structure are reduced, the possibility that the smoke is ignited by the high-temperature electrode tab fragments when the smoke is in contact with air after being sprayed out is reduced, and the safety of the battery cell is improved. Moreover, since the melting point of the intercepting component is higher than the melting point of the insulating component, when the battery cell is in thermal runaway, the insulating component inside the battery cell has been melted to form fragments, but the intercepting component will not be melted and will remain intact, so as to block the fragments formed by the melting of the insulating component, the fragments formed by the melting of the insulating component will not be sprayed out and be in contact with air, and the intercepted fragments will not pollute other battery cells in the battery.

[0014] In some embodiments of the application, the intercepting component is provided with a plurality of through holes, the plurality of through holes are uniformly distributed, and the plurality of through holes are arranged in a rectangular array. The arrangement in a rectangular array makes the arrangement of the plurality of through holes clear and obvious, which is conducive to reducing the processing efficiency of opening each through hole on the intercepting component and improving the processing efficiency of opening the through hole.

[0015] In some embodiments of the application, the diameters of the plurality of through holes are equal. When the battery cell is in thermal runaway, the smoke generated inside the battery cell can flow through each through hole quickly.

[0016] In some embodiments of the application, the diameters of a part of the through holes arranged opposite to the pressure relief structure are smaller than the diameters of the remaining through holes. The diameters of a part of the through holes arranged opposite to the pressure relief structure are set to be smaller, so as to effectively intercept the electrode tab fragments.

[0017] In some embodiments of the application, the distribution density of a part of the through holes arranged opposite to the pressure relief structure is greater than the distribution density of the remaining through holes, so as to effectively intercept the electrode tab fragments.

[0018] In some embodiments of the application, the shell has a circumferential side wall and two end walls connected to both ends of the circumferential side wall, the pressure relief structure is mounted on the end wall, the total area of the vertical projection of all the through holes along the arrangement direction of the two end walls is S1, the area of the vertical projection of the exhaust passage of the pressure relief structure is S2, and S1≥S2, so as to ensure that the smoke can pass through the intercepting component efficiently and avoid accumulation of the smoke.

[0019] In some embodiments of the application, the side surface of the intercepting component facing the electrode assembly is provided with a reinforcing rib, which is conducive to improving the overall structural strength of the intercepting component.

[0020] In some embodiments of the present application, the reinforcing ribs abut against the end surface of the electrode assembly towards the intercepting component. In this way, the electrode assembly is limited so that it always maintains a relative position that is stationary relative to the shell during the process of thermal runaway, and the situation that there is a stress concentration point between the electrode assembly and the intercepting component, or between the electrode assembly and the shell, can be avoided.

[0021] In some embodiments of the present application, the reinforcing ribs are provided with at least one through hole. In this way, the flow efficiency of the flue gas flowing through the intercepting component and reaching the pressure relief structure is improved.

[0022] In some embodiments of the present application, the area of the end surface of the electrode assembly towards the intercepting component is S3, the total area of the reinforcing ribs in contact with the electrode assembly is S4, and S4≥0.3*S3. In this way, it can be ensured that there is sufficient contact area between the reinforcing ribs and the end surface of the electrode assembly, and it can be ensured that the reinforcing ribs do not generate a stress concentration point on the electrode assembly due to the small mutual contact area between the reinforcing ribs and the end surface of the electrode assembly.

[0023] In some embodiments of the present application, the side surface of the intercepting component towards the pressure relief structure is provided with a first protrusion, and the first protrusion abuts against the pressure relief structure and / or the end wall on which the pressure relief structure is mounted. The intercepting component is limited from being deformed in a concave manner towards the pressure relief structure, thereby preventing the intercepting component from contacting the pressure relief structure after deformation and causing blockage of the exhaust passage.

[0024] In some embodiments of the present application, the total area of the first protrusions in contact with the end wall is S5, and S5≥0.1*S3. In this way, it can be ensured that there is sufficient contact area between the first protrusions and the pressure relief structure and / or the end wall, thereby preventing the first protrusions from generating a stress concentration point on the pressure relief structure and / or the end wall.

[0025] In some embodiments of the present application, the intercepting component, the reinforcing ribs and the first protrusions are integrally formed, which helps to improve the processing and production efficiency of the components.

[0026] In some embodiments of the present application, the intercepting component is spaced apart from the pressure relief structure, and the spacing between the surface of the intercepting component towards the pressure relief structure and the pressure relief structure is greater than or equal to 1 mm. In this way, the flue gas flows smoothly from the through hole of the intercepting component to the pressure relief structure, and then the flue gas can be smoothly discharged from the pressure relief structure.

[0027] In some embodiments of the present application, the inner wall of the circumferential side wall is provided with a plurality of second protrusions spaced apart for supporting the intercepting component, so that the assembly efficiency of the intercepting component is greatly improved, thereby improving the assembly and production efficiency of the battery monomer.

[0028] In some embodiments of the present application, one end wall covers the circumferential side wall to form a containing space, and a third protrusion is arranged on the side of the containing space facing the intercepting component, and the intercepting component is clamped between the second protrusion and the third protrusion.

[0029] In some embodiments of the present application, the third protrusions and the second protrusions are both in plurality, and the plurality of third protrusions are arranged one-to-one with the plurality of second protrusions.

[0030] In some embodiments of the present application, the cross-sectional shape of the shell perpendicular to the arrangement direction of the two end walls is square, and the plurality of second protrusions are arranged one-to-one at the corner positions of the circumferential side wall.

[0031] In some embodiments of the present application, the side of each second protrusion facing the containing space is arranged as an arc surface recessed in a direction away from the containing space. The arc surface on each second protrusion can smoothly avoid the electrode assembly, so that the electrode assembly can fully utilize the containing space, thereby improving the energy density of the battery cell.

[0032] In some embodiments of the present application, the electrode assembly is provided with a tab, and the intercepting component is provided with an assembly hole through which the tab passes. In this way, the tab can smoothly avoid the intercepting component to complete electrical connection with the electrode post structure mounted on the end wall, thereby improving the assembly efficiency.

[0033] In some embodiments of the present application, the intercepting component includes a first sub-intercepting component and a second sub-intercepting component, the first sub-intercepting component is provided with a first matching structure, the second sub-intercepting component is provided with a second matching structure, and the first matching structure and the second matching structure are adaptively connected.

[0034] In some embodiments of the present application, the first sub-intercepting component and the second sub-intercepting component are both in plurality, and the first sub-intercepting component and the second sub-intercepting component are alternately distributed in sequence.

[0035] In some embodiments of the present application, the first matching structure and the second matching structure are mutually clamped or mutually engaged.

[0036] In some embodiments of the present application, the intercepting component is a ceramic piece. The intercepting component made of ceramic material has the characteristics of good temperature resistance and good insulation.

[0037] In some embodiments of the present application, the intercepting component includes a metal plate and an insulating layer, the insulating layer is arranged on the metal plate, the insulating layer is used to insulate the metal plate from the electrode assembly, and the melting point of the metal plate is higher than the melting point of the insulating layer. The insulating layer ensures the overall insulation performance of the intercepting component, and because the melting point of the metal plate is higher than the melting point of the insulating layer, the metal plate and the electrode assembly are always insulated, and the metal plate can effectively improve the overall structural strength of the intercepting component.

[0038] According to a second aspect of the present application, a battery is provided, which comprises the battery cell as described above.

[0039] According to a third aspect of the present application, a power consuming device is provided, which comprises the battery as described above. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or exemplary technical descriptions will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0041] Fig. 1 is an exploded schematic view of a battery cell according to an embodiment of the present application;

[0042] Fig. 2 is an exploded schematic view of another battery cell according to an embodiment of the present application;

[0043] Fig. 3 is an exploded schematic view of still another battery cell according to an embodiment of the present application;

[0044] Fig. 4-1 is a structural schematic view of a shell main body of a shell of the battery cell according to an embodiment of the present application;

[0045] Fig. 4-2 is an enlarged schematic view of A in Fig. 4-1;

[0046] Fig. 5 is a structural schematic view of an intercepting component used in the battery cell according to an embodiment of the present application, wherein the hole diameters of the through holes are equal;

[0047] Fig. 6 is a front view schematic view of an intercepting component used in the battery cell according to an embodiment of the present application, wherein the intercepting component comprises a metal plate and an insulating layer;

[0048] Fig. 7-1 is a sectional view schematic view of B-B direction in Fig. 6;

[0049] Fig. 7-2 is an enlarged schematic view of C in Fig. 7-1;

[0050] Fig. 8 is a structural schematic view of an intercepting component used in the battery cell according to an embodiment of the present application, wherein the hole diameters of the through holes are not equal;

[0051] Fig. 9 is a structural schematic view of an intercepting component used in the battery cell according to an embodiment of the present application, wherein the intercepting component is provided with reinforcing ribs;

[0052] Fig. 10 is a structural schematic view of an intercepting component used in the battery cell according to an embodiment of the present application, wherein the intercepting component is provided with reinforcing ribs and first protrusions;

[0053] Fig. 11 is a structural schematic diagram of an intercepting component of a battery cell according to the present application, wherein the reinforcing ribs are arranged in a longitudinal and transverse intersecting form;

[0054] Fig. 12 is a structural schematic diagram of an intercepting component of a battery cell according to the present application, wherein the intercepting component is provided with an assembly hole;

[0055] Fig. 13 is a structural schematic diagram of an intercepting component of a battery cell according to the present application, wherein the intercepting component is formed by splicing a first sub-intercepting component and a second sub-intercepting component;

[0056] Fig. 14 is a structural schematic diagram of an intercepting component of a battery cell according to the present application, wherein the intercepting component is formed by splicing a first sub-intercepting component and a second sub-intercepting component through a first engagement edge and a second engagement edge;

[0057] Fig. 15 is an exploded schematic diagram of a battery according to an embodiment of the present application;

[0058] Fig. 16 is a structural schematic diagram of an electric device according to an embodiment of the present application.

[0059] In the drawings, various reference numerals are used throughout the figures to indicate various elements according to embodiments of the present application.

[0060] 100, battery cell;

[0061] 10, shell; 101, shell body; 11, circumferential side wall; 111, second protrusion; 112, arc surface; 12, end wall; 13, accommodation space; 102, cover body; 15, electrode post structure;

[0062] 20, pressure relief structure;

[0063] 30, electrode assembly; 31, tab; 32, transition fillet;

[0064] 40, intercepting component; 41, through hole; 42, reinforcing rib; 43, first protrusion; 44, assembly hole; 401, first sub-intercepting component; 402, second sub-intercepting component; 404, first clamping structure; 405, second clamping structure; 406, first engagement edge; 407, second engagement edge; 408, metal plate; 409, insulating layer;

[0065] 200, battery; 210, box shell; 211, box body; 212, box cover; 213, assembly space;

[0066] 300, electric device; 301, vehicle frame; 302, drive motor; 303, vehicle wheel. DETAILED DESCRIPTION

[0067] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application.

[0068] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "first", "second" are only for the purpose of convenient description, and cannot be understood as indicating or implying relative importance or implying the number of technical features.

[0069] At present, new energy, that is, renewable energy, plays an increasingly important role in social development, and the application and popularization of new energy are also developing rapidly. New energy includes but is not limited to solar energy, wind energy, geothermal energy, tidal energy, etc. These renewable energy sources are converted into electrical energy that is easy to store and easy to use, and are applied to various industries through electrical energy output. In order to store the electrical energy converted from renewable energy, new energy batteries are needed, which include but are not limited to lithium batteries, nickel-hydrogen batteries, lead-acid batteries, etc. Among them, lithium batteries have more outstanding advantages than other types of batteries, therefore, various enterprises, institutions, research institutes, etc. are vigorously developing lithium batteries. Hereinafter, new energy batteries are collectively referred to as batteries.

[0070] Generally, a battery includes at least one battery cell, wherein most batteries are equipped with multiple battery cells to meet the demand for large amounts of electricity. Hereinafter, the battery is described by way of example with multiple battery cells. Multiple battery cells are electrically connected in parallel, series, or a combination of series and parallel, so as to output electrical energy with the required output voltage and output current.

[0071] In the process of using the battery, the battery inevitably ages after a period of use, or the temperature of the battery continuously rises during use, or the battery is affected by sudden changes in the use environment (such as overcharging, overdischarging, extrusion, collision, etc. Abnormal use environment), the above factors can cause the battery cells of the battery to easily undergo thermal runaway.

[0072] In the related art, when thermal runaway occurs in a battery cell, high-temperature and high-pressure smoke is generated inside the battery cell, and the tab of the electrode assembly of the battery cell can be broken, thereby generating large tab fragments that will be ejected from the pressure relief structure along with the high-temperature and high-pressure smoke. When the high-temperature and high-pressure smoke contacts the air, the tab fragments can ignite the smoke as a fire source due to the high-temperature tab fragments mixed in the smoke, and even cause an explosion.

[0073] Based on the above considerations, the present application provides a battery cell, and a plurality of battery cells are combined to form a battery, and the battery formed is applied to a power supply for an electrical device. The battery cell provided by the present application increases an intercepting component in the shell, that is, the intercepting component is arranged in the shell and located between the pressure relief structure and the electrode assembly of the battery cell. In this way, when the battery cell is in thermal runaway, the tab fragments mixed in the smoke inside the battery cell will be intercepted by the intercepting component, so that the tab fragments cannot pass through the intercepting plate to reach the pressure relief structure. In this way, the tab fragments mixed in the smoke ejected from the pressure relief structure inside the battery cell are reduced, the possibility of the smoke being ignited by the high-temperature tab fragments when the smoke contacts the air is reduced, and the safety of the battery cell is improved.

[0074] In order to illustrate the technical solutions provided by the present application, the following will be described in detail in combination with specific drawings and embodiments.

[0075] As shown in FIGS. 1 to 3, the present application provides a battery cell 100, which includes a shell 10, a pressure relief structure 20, an electrode assembly 30, an insulating member (not shown) and an intercepting component 40. The pressure relief structure 20 is installed on the shell 10, the electrode assembly 30 is arranged in the shell 10, the insulating member is arranged in the shell 10, and the insulating member is located between the shell 10 and the electrode assembly 30 to insulate the shell 10 and the electrode assembly 30. The intercepting component 40 is arranged in the shell 10, and the intercepting component 40 is located between the pressure relief structure 20 and the electrode assembly 30. The intercepting component 40 is insulated from the shell 10, a through hole 41 is arranged at a position opposite to the pressure relief structure 20 of the intercepting component 40, and the melting point of the intercepting component 40 is higher than the melting point of the insulating member.

[0076] The insulating member refers to an isolation component in the battery cell 100 for ensuring the insulation between the electrode assembly 30 and the metal shell 10, such as a Mylar film covering the electrode assembly 30, or an insulating plastic layer attached to the inner side wall of the metal shell 10, etc.

[0077] In some embodiments of the present application, the shell 10 has a circumferential side wall 11 and two opposite end walls 12, the circumferential side wall 11 and the two end walls 12 form a containing space 13, and the pressure relief structure 20 is installed on at least one end wall 12. When the battery monomer 100 is a cylindrical monomer, both of the two end walls 12 are circular end walls, the circumferential side wall 11 is a cylindrical side wall, and the pressure relief structure 20 is installed on one of the two end walls 12. When the battery monomer 100 is a square monomer, at this time, the shell 10 of the battery monomer 100 is a cuboid, the circumferential side wall 11 is composed of four square side walls, and the pressure relief structure 20 can also be installed on one of the square side walls. Hereinafter, the battery monomer 100 is taken as a square monomer and the pressure relief structure 20 is installed on one of the end walls 12 as an example for description.

[0078] When the intercepting component 40 is assembled in the containing space 13, the containing space 13 is divided into a first space and a second space by the intercepting component 40, the first space is the space on the side of the intercepting component 40 facing the electrode assembly 30 (i.e. the electrode assembly 30 is located in the first space), and the second space is the space on the side of the intercepting component 40 facing the pressure relief structure 20, the first space and the second space are connected through the through hole 41 on the intercepting component 40. When the battery monomer 100 occurs thermal runaway, the first space is the first to generate high-temperature and high-pressure smoke, and the smoke is easy to be mixed with large-volume electrode tab fragments. Then, the smoke flows into the second space through the through hole 41 on the intercepting component 40, and the second space is filled with smoke. Next, under the high-temperature and high-pressure action of the smoke in the second space, the exhaust passage of the pressure relief structure 20 is opened, so that the smoke in the second space can be smoothly discharged.

[0079] The battery monomer 100 provided by the present application is provided with the intercepting component 40 in the containing space 13, and the intercepting component 40 is located between the pressure relief structure 20 and the electrode assembly 30, so that when the battery monomer 100 occurs thermal runaway, the smoke can flow from the through hole 41 of the intercepting component 40 to the pressure relief structure 20 and be sprayed out, and the large-volume electrode tab fragments mixed in the smoke inside the battery monomer 100 are intercepted by the intercepting component 40, so that the electrode tab fragments cannot pass through the intercepting component 40 to reach the pressure relief structure 20. In this way, the electrode tab fragments mixed in the smoke sprayed out from the inside of the battery monomer 100 to the pressure relief structure 20 are reduced, the possibility that the smoke is ignited by the high-temperature electrode tab fragments when the smoke contacts with the air after being sprayed out is reduced, and the safety of the battery monomer 100 is improved. Moreover, since the melting point of the intercepting component 40 is higher than the melting point of the insulating piece, when the battery monomer 100 occurs thermal runaway, even if the insulating piece inside the battery monomer 100 has been melted to form fragments, the intercepting component 40 will not be melted and will remain intact, so as to block the fragments formed by the melting of the insulating piece, the fragments formed by the melting of the insulating piece will not be sprayed out and contact with the air, and the intercepted fragments will not pollute other battery monomers 100 in the battery 200.

[0080] And, since the intercepting component 40 intercepts the electrode tab fragments within the first space, the electrode tab fragments are less likely to flow with the smoke to the pressure relief structure 20. In this way, not only is the likelihood of the electrode tab fragments being ejected from the pressure relief structure 20 reduced, thereby reducing the likelihood of the ejected electrode tab fragments igniting the smoke, but also the likelihood of the electrode tab fragments reaching the pressure relief structure 20 is reduced, thereby reducing the likelihood of the electrode tab fragments clogging the pressure relief structure 20 at the pressure relief structure 20, preventing the battery cell 100 from bursting, and improving the safety performance of the battery cell 100.

[0081] In addition, if the electrode tab fragments are ejected outside of the battery cell 100, the electrode tab fragments are generally electrically conductive, and the electrode tab fragments, when ejected outside of the battery cell 100, will come into contact with the electrode post structure 15 of other battery cells 100 and other electronic devices of the battery 200, thereby causing an internal short circuit of the battery 200, leading to complete damage of the battery 200. However, since the battery 200 provided by the present application is assembled using the battery cell 100 provided by the present application, since the large-volume electrode tab fragments mixed in the smoke inside the battery cell 100 are intercepted by the intercepting component 40, that is, the ejection of the electrode tab fragments outside of the battery cell 100 is greatly reduced, even when thermal runaway occurs in one or several battery cells 100 in the battery 200, the probability of the battery 200 being completely damaged due to an internal short circuit of the battery 200 caused by the ejected electrode tab fragments is greatly reduced, the safety of the battery 200 is improved, and after the damaged battery cell 100 is replaced with a new battery cell 100 through repair work, the battery 200 can still continue to be used normally, thereby improving the service life of the battery 200.

[0082] Wherein: the pressure relief structure 20 refers to an element or component that is actuated to release internal pressure when the internal pressure or temperature of the battery cell 100 reaches a predetermined threshold. Wherein, "actuated" refers to the pressure relief structure 20 producing an action, thereby allowing the internal pressure and temperature of the battery cell 100 to be released from the exhaust passage. The action produced by the pressure relief structure 20 can include but is not limited to at least one of the pressure relief structure 20 being broken, torn or melted, etc. After the pressure relief structure 20 is actuated, the high-temperature smoke inside the battery cell 100 will be discharged outwardly from the exhaust passage of the pressure relief structure 20. The predetermined threshold can be adjusted according to different design requirements. The predetermined threshold can depend on the material of one or more of the positive electrode tab, the negative electrode tab, the electrolyte and the separator film in the battery cell 100. The pressure relief structure 20 can use elements or components that are sensitive to pressure or temperature, that is, when the internal pressure or temperature of the battery cell 100 reaches the predetermined threshold, the pressure relief structure 20 is actuated, thereby forming a passage for the internal pressure to be released.

[0083] As shown in FIGS. 1-3, 5-14, in some embodiments of the present application, the intercepting component 40 is provided with a plurality of through holes 41, and the plurality of through holes 41 are uniformly distributed. When the battery monomer 100 is in thermal runaway, the smoke generated inside the battery monomer 100 can flow through the plurality of through holes 41 of the intercepting component 40 to the pressure relief structure 20, improving the flow efficiency of the smoke flowing to the pressure relief structure 20. When the smoke flows to the pressure relief structure 20, under the high temperature and high pressure of the smoke, the exhaust passage of the pressure relief structure 20 is opened, so that the smoke can be smoothly discharged, avoiding the continuous accumulation of smoke inside the battery monomer 100, which causes the shell 10 to be cracked or even exploded.

[0084] Further, as shown in FIGS. 5-14, the plurality of through holes 41 can be, but are not limited to, distributed in a rectangular array. The rectangular array distribution makes the arrangement of the plurality of through holes 41 clear and obvious, which is beneficial to reduce the opening of each through hole 41 on the intercepting component 40 and improve the processing efficiency of opening the through holes 41.

[0085] In other embodiments of the present application, the plurality of through holes 41 can also be randomly distributed.

[0086] As shown in FIGS. 5 and 6, in the intercepting component 40 of some embodiments of the present application, the diameters of the plurality of through holes 41 are equal, that is, the flow efficiency of each through hole 41 to the smoke is equal. When the battery monomer 100 is in thermal runaway, the smoke generated inside the battery monomer 100 can quickly flow through each through hole 41 and then flow to the pressure relief structure 20. Then, under the high temperature and high pressure of the smoke, the exhaust passage of the pressure relief structure 20 is opened, so that the smoke can be smoothly discharged, avoiding the continuous accumulation of smoke inside the battery monomer 100, which causes the shell 10 to be cracked or even exploded.

[0087] As shown in FIG. 8, in the interception component 40 of some embodiments of the present application, the aperture of a portion of the through holes 41 arranged opposite to the pressure relief structure 20 is smaller than the aperture of the rest of the through holes 41. When the exhaust passage of the pressure relief structure 20 is open, at this time, the smoke flow rate of the through holes 41 on the area of the interception component 40 opposite to the exhaust passage of the pressure relief structure 20 is the largest, in order to avoid that the pole piece fragments may squeeze through the through holes 41 under the action of the smoke flow rate, therefore, the aperture of a portion of the through holes 41 arranged opposite to the pressure relief structure 20 is set to be smaller, thereby effectively intercepting the pole piece fragments. And, in order to ensure that the smoke can pass through the interception component 40 efficiently and avoid smoke accumulation, therefore, the aperture of the rest of the through holes 41 is designed to be larger, thereby enabling the smoke to pass through the interception component 40 rapidly and flow to the pressure relief structure 20. It should be noted that the aperture of the through holes 41 is designed to be larger or designed to be smaller is relative, that is, the aperture of a portion of the through holes 41 arranged opposite to the pressure relief structure 20 is compared with the aperture of the through holes 41 at other positions of the interception component 40, thereby obtaining the comparison result that the aperture of the through holes 41 is designed to be smaller or designed to be larger.

[0088] Preferably, in some embodiments of the present application, the distribution density of a portion of the through holes 41 arranged opposite to the pressure relief structure 20 is greater than the distribution density of the rest of the through holes 41. And, the aperture of a portion of the through holes 41 arranged opposite to the pressure relief structure 20 is smaller than the aperture of the rest of the through holes 41; or, the apertures of all the through holes 41 are equal.

[0089] In order to ensure that the smoke can pass through the interception component 40 efficiently and avoid smoke accumulation, in some embodiments of the present application, along the arrangement direction of the two end walls 12, the total area of the vertical projection of all the through holes 41 is S1, the area of the vertical projection of the exhaust passage of the pressure relief structure 20 is S2, S1≥S2. For the battery monomer 100 without setting the interception component, when the battery monomer 100 occurs thermal runaway, the smoke generated inside the battery monomer 100 will be directly discharged from the pressure relief structure 20 when the inside space of the battery monomer 100 is filled. Relative to the battery monomer 100 in the related art without setting the interception component 40 in the containing space 13, although the battery monomer 100 of the present application increases the setting of the interception component 40 in the containing space 13, but because S1≥S2, therefore, the smoke in the first space can flow through the through holes 41 of the interception component 40 rapidly and enter the second space, so that the smoke will not be intercepted by the interception component 40 and accumulated in the first space, and the smoke in the second space is discharged from the pressure relief structure 20. Therefore, relative to the battery monomer 100 in the related art without setting the interception component 40 in the containing space 13, the battery monomer 100 of the present application can ensure that the situation that the pressure relief rate inside the battery monomer 100 is significantly reduced due to the increase of the setting of the interception component 40 does not occur.

[0090] Preferably, in some embodiments of the present application, S1≥1.2*S2, so as to further ensure that the situation of the pressure relief rate inside the battery monomer 100 being significantly reduced due to the increase of the interception component 40 is not occurred.

[0091] As shown in FIGS. 9-11, in the interception component 40 of some embodiments of the present application, the interception component 40 is provided with a reinforcing rib 42 on the side surface thereof facing the electrode assembly 30. In this way, the structural strength of the interception component 40 as a whole is improved, and when the battery monomer 100 is in thermal runaway, the air pressure in the first space instantaneously rises, so that the interception component 40 instantaneously generates an air pressure difference on both sides thereof facing the first space and the second space. Since the reinforcing rib 42 is provided on the interception component 40 to improve the structural strength of the interception component 40 as a whole, the interception component 40 can withstand the instantaneous air pressure difference, so that the interception component 40 can remain undeformed during the thermal runaway process.

[0092] In some embodiments of the present application, the reinforcing rib 42 abuts against the end surface of the electrode assembly 30 facing the interception component 40. When the battery monomer 100 is in thermal runaway, the electrode assembly 30 is affected by the high-temperature and high-pressure flue gas in the first space, so that the electrode assembly 30 tends to move toward the interception component 40. Therefore, in the battery monomer 100, the reinforcing rib 42 abuts against the end surface of the electrode assembly 30 facing the interception component 40, thereby limiting the electrode assembly 30 so that the electrode assembly 30 always maintains a stationary relative position with respect to the shell 10 during the thermal runaway process. That is, during the thermal runaway process of the battery monomer 100, the electrode assembly 30 will not move toward the interception component 40 relative to the shell 10, so that during the thermal runaway process, the situation of stress concentration between the electrode assembly 30 and the interception component 40, or between the electrode assembly 30 and the shell 10, can be avoided.

[0093] When there is a stress concentration point between the electrode assembly 30 and the interception component 40 during the thermal runaway process, i.e., the reinforcing rib 42 generates a stress concentration point on the electrode assembly 30, the electrode assembly 30 is easily damaged after being stressed, and then the electrode assembly 30 will continue to generate more number of tab fragments.

[0094] When there is a stress concentration point between the electrode assembly 30 and the shell 10 in the process of thermal runaway, it can be that the electrode assembly 30 is deflected to collide with the circumferential side wall 11 to generate a stress concentration point, at this time, the circumferential side wall 11 is stressed and under the action of high pressure of the flue gas in the first space, the circumferential side wall 11 can be damaged and broken, thereby affecting other battery monomers 100 of the battery 200. Or, when there is a stress concentration point between the electrode assembly 30 and the shell 10 in the process of thermal runaway, it can be that the electrode assembly 30 generates a stress concentration point on the electrode post structure 15 assembled on the end wall 12 of the shell 10, causing the assembly relationship between the electrode post structure 15 and the end wall 12 to be damaged and fail, thereby affecting other battery monomers 100 of the battery 200.

[0095] In some embodiments of the present application, as shown in FIG. 9, the reinforcing ribs 42 are provided with at least one through hole 41. In this way, while improving the overall structural strength of the interception component 40 through the reinforcing ribs 42, the flow efficiency of the flue gas flowing from the first space to the second space can be further improved, and then the flue gas in the second space is discharged from the pressure relief structure 20, so that the flue gas will not be intercepted by the interception component 40 and accumulated in the first space.

[0096] In some embodiments of the present application, the area of the end face of the electrode assembly 30 towards the interception component 40 is S3, the total area of the contact between the reinforcing ribs 42 and the electrode assembly 30 is S4, and S4≥0.3*S3. In this way, it can be ensured that there is enough contact area between the reinforcing ribs 42 and the end face of the electrode assembly 30, and it is ensured that the reinforcing ribs 42 and the end face of the electrode assembly 30 will not generate a stress concentration point on the electrode assembly 30 due to the small mutual contact area, thereby ensuring that the electrode assembly 30 will not continue to generate more number of tab fragments in the process of thermal runaway.

[0097] In some embodiments of the present application, as shown in FIG. 10, the intercepting component 40 is provided with first protrusions 43 on the side surface thereof facing the pressure relief structure 20, and the first protrusions 43 abut against the end wall 12 on which the pressure relief structure 20 is mounted. The provision of the first protrusions 43 not only enhances the structural strength of the intercepting component 40 as a whole, but also, when the first protrusions 43 abut against the end wall 12, the intercepting component 40 is prevented from being deformed concavely towards the pressure relief structure 20 under the action of the smoke whose pressure in the first space rises instantaneously, thereby preventing the deformed intercepting component 40 from contacting the pressure relief structure 20 and causing the exhaust passage to be blocked, and the smoke can be discharged smoothly from the pressure relief structure 20. Further, when a part of the first protrusions 43 abut against the pressure relief structure 20, through holes 41 are formed in the first protrusions 43, so that the smoke in the first space can flow to the pressure relief structure 20 through the through holes 41 in the first protrusions 43, and then the smoke can be discharged smoothly from the pressure relief structure 20, reducing the obstruction of the first protrusions 43 to the flow of the smoke to the pressure relief structure 20, and ensuring the discharge rate of the smoke, i.e., ensuring that the pressure relief rate inside the battery monomer 100 does not decrease significantly due to the provision of the first protrusions 43 on the intercepting component 40.

[0098] In order to avoid stress concentration points of the first protrusions 43 on the end wall 12 when the battery monomer 100 is in thermal runaway, the total area S5 of the contact between all the first protrusions 43 and the end wall 12 is 0.1*S3, and the area of the end surface of the electrode assembly 30 facing the intercepting component 40 is S3. In the battery monomer 100 of the present application, when all the first protrusions 43 abut against the end wall 12, the area of the side surface of the end wall 12 facing the intercepting component 40 is substantially equal to the area S3 of the end surface of the electrode assembly 30 facing the intercepting component 40 (although the area of the side surface of the end wall 12 facing the intercepting component 40 is slightly larger than the area S3 of the end surface of the electrode assembly 30 facing the intercepting component 40, the difference is small and can be ignored), so that the parameter design of S5≥0.1*S3 can meet the design requirements. In this way, the first protrusions 43 and the end wall 12 have sufficient contact area, thereby preventing the first protrusions 43 from having stress concentration points on the end wall 12.

[0099] In some embodiments of the present application, the intercepting component 40 is provided with reinforcing ribs 42 on the side surface facing the electrode assembly 30, and the intercepting component 40 is provided with first protrusions 43 on the side surface facing the pressure relief structure 20. The reinforcing ribs 42 abut against the end surface of the electrode assembly 30 facing the intercepting component 40, and the first protrusions 43 abut against the end wall 12 on which the pressure relief structure 20 is mounted. In this embodiment, the reinforcing ribs 42 are provided with through holes 41, and the first protrusions 43 are also provided with through holes 41. Further, the reinforcing ribs 42 and the first protrusions 43 can be provided in one-to-one correspondence, and the through holes 41 on the reinforcing ribs 42 and the through holes 41 on the first protrusions 43 are in one-to-one correspondence. In this way, the reinforcing ribs 42 and the first protrusions 43 are respectively arranged on the two sides of the intercepting component 40, which significantly enhances the structural strength of the intercepting component 40 as a whole. Moreover, by providing the reinforcing ribs 42 and the first protrusions 43 with through holes 41, the flow rate of flue gas flowing from the first space into the second space is ensured, the flue gas discharge rate is ensured, and the situation that the internal pressure relief rate of the battery cell 100 is significantly reduced due to the addition of the intercepting component 40 in the containing space 13 is avoided.

[0100] In some embodiments of the present application, the intercepting component 40, the reinforcing ribs 42, and the first protrusions 43 are relatively independent components, that is, the reinforcing ribs 42 and the first protrusions 43 are respectively connected and fixed to the intercepting component 40. Therefore, the intercepting component 40 is spaced apart from the pressure relief structure 20, and the first protrusions 43 are located in the spacing space between the intercepting component 40 and the pressure relief structure 20. The spacing between the surface of the intercepting component 40 facing the pressure relief structure 20 and the pressure relief structure 20 is greater than or equal to 1 mm, and the height of the first protrusions 43 is less than 1 mm. That is, the height of the second space along the arrangement direction of the two end walls 12 is greater than or equal to 1 mm. In this case, the intercepting component 40 is a single plate-shaped component, and the reinforcing ribs 42 and the first protrusions 43 are relatively independent structural components added to the plate-shaped component.

[0101] In some embodiments of the present application, the intercepting component 40 is not provided with the first protrusions 43, and the intercepting component 40 is spaced apart from the pressure relief structure 20. The spacing between the surface of the intercepting component 40 facing the pressure relief structure 20 and the pressure relief structure 20 is greater than or equal to 1 mm. In this way, after the flue gas flows into the second space through the through holes 41 of the intercepting component 40, it can smoothly reach the pressure relief structure 20, and then the flue gas can be smoothly discharged from the pressure relief structure 20.

[0102] Preferably, the distance between the surface of the interceptor 40 facing the pressure relief structure 20 and the pressure relief structure 20 is greater than or equal to 2.5 mm. That is, the height of the second space along the arrangement direction of the two end walls 12 is greater than or equal to 2.5 mm. This allows the flue gas to flow more smoothly into the second space from the through hole 41 of the interceptor 40, reach the pressure relief structure 20 more smoothly, and then be discharged more smoothly from the pressure relief structure 20.

[0103] In some other embodiments of this application, the interceptor 40, the reinforcing rib 42, and the first protrusion 43 are integrally formed. Thus, by employing die casting, forging, or casting processes to integrally form the interceptor 40, the reinforcing rib 42, and the first protrusion 43, not only is the structural strength among the interceptor 40, the reinforcing rib 42, and the first protrusion 43 guaranteed, but it also helps to improve the processing and production efficiency of the parts.

[0104] In some other embodiments of this application, the reinforcing ribs 42 on the interceptor component 40 may also be provided with intersecting "well"-shaped ribs, as shown in FIG11. Furthermore, the top surface of the reinforcing ribs 42 does not abut against the end face of the electrode assembly 30; in this case, the reinforcing ribs 42 are only for enhancing the overall structural strength of the interceptor component 40.

[0105] As shown in Figures 1 to 3, in the battery cell 100 of this application, a circumferential sidewall 11 and an end wall 12 connected to one end of the circumferential sidewall 11 constitute the shell body 101, and the other end wall 12 constitutes the cover 102 of the shell 10. The cover 102 closes to the opening of the shell body 101 to form an accommodating space 13.

[0106] As shown in Figures 1 and 2, in some embodiments of this application, the pressure relief structure 20 is installed on the cover 102, and the inner wall of the circumferential sidewall 11 is provided with a plurality of second protrusions 111 spaced apart for supporting the interceptor component 40. When assembling the electrode assembly 30 and the interceptor component 40 into the housing 10, the electrode assembly 30 is first placed into the receiving space 13, and then the interceptor component 40 is placed into the receiving space 13 until the circumferential edge of the interceptor component 40 is simultaneously supported by the plurality of second protrusions 111, thus the interceptor component 40 is positioned, at which point the reinforcing ribs 42 on the interceptor component 40 abut against the end face of the electrode assembly 30. Then the cover 102 is closed onto the housing body 101, and the circumferential joint between the cover 102 and the housing body 101 is welded, thereby completing the assembly of the electrode assembly 30 and the interceptor component 40 into the housing 10. This greatly improves the assembly efficiency of the interceptor component 40, thereby improving the assembly production efficiency of the battery cell 100.

[0107] In some embodiments of the present application, the intercepting component 40 is provided with the reinforcing ribs 42 and the first protrusions 43, and the inner wall of the circumferential side wall 11 is provided with the second protrusions 111. The pressure relief structure 20 is installed on the cover 102, and when the cover 102 is covered on the shell body 101, the inner wall of the cover 102 abuts against the first protrusions 43 on the intercepting component 40, so that the intercepting component 40 is stably assembled between the pressure relief structure 20 and the electrode assembly 30 through the cooperative structure of the second protrusions 111, the first protrusions 43 and the cover 102.

[0108] In some embodiments of the present application, the intercepting component 40 is provided with the reinforcing ribs 42 but not the first protrusions 43, and the cover 102 is provided with a plurality of third protrusions, and the inner wall of the circumferential side wall 11 is provided with the second protrusions 111. The pressure relief structure 20 is installed on the cover 102, and when the cover 102 is covered on the shell body 101, the intercepting component 40 is clamped between the second protrusions 111 and the third protrusions. The reinforcing ribs 42 on the intercepting component 40 abut against the end face of the electrode assembly 30 when the cover 102 is covered on the shell body 101. When the intercepting component 40 is provided with the first protrusions 43, the first protrusions 43 occupy the second space, which causes the flow of the flue gas in the second space to the pressure relief structure 20 to be hindered by the first protrusions 43. However, since the intercepting component 40 of the present embodiment is not provided with the first protrusions 43, the second space is unobstructed, and thus the flue gas can flow to the pressure relief structure 20 smoothly without being hindered by the first protrusions 43 in the second space.

[0109] Further, the plurality of third protrusions are provided in one-to-one correspondence with the plurality of second protrusions 111. In this way, the plurality of third protrusions and the plurality of second protrusions 111 stably clamp and fix the intercepting component 40 in place.

[0110] In some embodiments of the present application, the third protrusions can also be a ring of surrounding walls on the circumferential edge region of the cover 102 towards the electrode assembly 30. When the cover 102 is covered on the shell body 101, the ring of surrounding walls abut against the intercepting component 40, so that the intercepting component 40 is stably assembled between the pressure relief structure 20 and the electrode assembly 30.

[0111] As shown in FIG. 3, in some embodiments of the present application, the intercepting component 40 is provided with the reinforcing ribs 42 but not the first protrusions 43, and the pressure relief structure 20 is installed on the bottom of the shell main body 101, i.e. the pressure relief structure 20 is installed on the end wall 12 of the shell main body 101. When assembling the electrode assembly 30 and the intercepting component 40 to the shell 10, the intercepting component 40 is first placed into the accommodation space 13 until the circumferential edge of the intercepting component 40 is supported by the plurality of second protrusions 111 at the same time, then the electrode assembly 30 is placed into the accommodation space 13 and abuts against the reinforcing ribs 42 on the intercepting component 40. Then the cover 102 is covered on the shell main body 101 so that the inner side wall of the cover 102 abuts against the electrode assembly 30, and the circumferential joint between the cover 102 and the shell main body 101 is welded, thereby completing the assembly of the electrode assembly 30 and the intercepting component 40 to the shell 10. When the intercepting component 40 is provided with the first protrusions 43, the first protrusions 43 occupy the second space, causing the flow of flue gas in the second space to the pressure relief structure 20 to be hindered by the first protrusions 43. However, since the intercepting component 40 of the present embodiment is not provided with the first protrusions 43, the second space is unobstructed, and therefore there is no first protrusion 43 in the second space to hinder the flow of flue gas to the pressure relief structure 20, so that the flue gas can flow smoothly to the pressure relief structure 20.

[0112] In some embodiments of the present application, the cross-sectional shape of the shell 10 perpendicular to the arrangement direction of the two end walls 12 is square, i.e. the battery cell 100 of the present application is a square battery cell. As shown in FIGS. 4-1 and 4-2, the plurality of second protrusions 111 are correspondingly provided at the corner positions of the circumferential side wall 11, i.e. the four corner positions of the circumferential side wall 11 are each provided with a second protrusion 111, and the number of second protrusions 111 is four. Correspondingly, the shape of the intercepting component 40 is square, and the intercepting component 40 is placed into the accommodation space 13 until the four corner positions of the intercepting component 40 respectively abut against the four second protrusions 111.

[0113] As shown in FIGS. 1 to 3, in some embodiments of the present application, the battery cell 100 is a square battery cell, and the side of each second protrusion 111 facing the accommodation space 13 is provided as an arc-shaped surface 112 recessed away from the accommodation space 13. Since the electrode assembly 30 is formed by stacking the positive electrode sheet, the insulating separator and the negative electrode sheet and then winding, so that the cross-section of the electrode assembly 30 is close to square, and the area of the electrode assembly 30 corresponding to the corner positions of the circumferential side wall 11 is the transition round corner 32. And the pressure relief structure 20 is installed on the cover 102. Therefore, when the electrode assembly 30 is placed into the accommodation space 13, the arc-shaped surface 112 on each second protrusion 111 can smoothly avoid the electrode assembly 30, so that the electrode assembly 30 can fully utilize the accommodation space 13, thereby improving the energy density of the battery cell 100.

[0114] As shown in FIGS. 1-3, the electrode assembly 30 is provided with a tab 31. As shown in FIGS. 1, 12-14, in some embodiments of the present application, the intercepting component 40 is provided with an assembly hole 44 through which the tab 31 passes. In this way, the tab 31 can smoothly pass through the assembly hole 44, and the tab 31 and the intercepting component 40 are insulated from each other, i.e., the intercepting component 40 and the electrode assembly 30 are insulated from each other. In this way, the tab 31 can smoothly avoid the intercepting component 40 to complete electrical connection with the electrode post structure 15 mounted on the end wall 12, improving assembly efficiency.

[0115] In some embodiments of the present application, the intercepting component 40 can include, but is not limited to, a first sub-intercepting component 401 and a second sub-intercepting component 402, the first sub-intercepting component 401 is provided with a first matching structure, the second sub-intercepting component 402 is provided with a second matching structure, and the first matching structure and the second matching structure are adaptively connected. As shown in FIG. 13, the intercepting component 40 is formed by splicing three sub-intercepting components, i.e., one second sub-intercepting component 402 and two first sub-intercepting components 401. In the intercepting component 40 of the present embodiment, the abutting edge of the first sub-intercepting component 401 is provided with a first clamping structure 404, the abutting edge of the second sub-intercepting component 402 is provided with a second clamping structure 405 which is adapted to the first clamping structure 404, and the first clamping structure 404 and the second clamping structure 405 are clamped to each other to form a splice. In the present embodiment, the first matching structure is the first clamping structure 404, and the second matching structure is the second clamping structure 405. As shown in FIG. 13, between the first sub-intercepting component 401 and the second sub-intercepting component 402, when the first sub-intercepting component 401 and the second sub-intercepting component 402 are spliced to each other, the first clamping structure 404 and the second clamping structure 405 are clamped to each other, thereby splicing and fixing the first sub-intercepting component 401 and the second sub-intercepting component 402.

[0116] In some embodiments of the present application, as shown in FIG. 14, the intercepting component 40 is formed by splicing two sub-intercepting components, i.e., a first sub-intercepting component 401 and a second sub-intercepting component 402. The abutting edge of the first sub-intercepting component 401 is provided as a first engagement edge 406, the abutting edge of the second sub-intercepting component 402 is provided as a second engagement edge 407 which is adapted to the first engagement edge 406, and the first engagement edge 406 and the second engagement edge 407 are engaged to each other to form a splice.

[0117] It should be noted that in the present application, the intercepting component 40 can be formed by splicing a plurality of first sub-intercepting components 401 and a plurality of second sub-intercepting components 402, and the first sub-intercepting components 401 and the second sub-intercepting components 402 are alternately distributed in sequence. No matter whether the splicing and fixing are achieved by the mutual clamping of the first clamping structure 404 and the second clamping structure 405 or by the mutual occlusion of the first occlusion edge 406 and the second occlusion edge 407, the adjacent first sub-intercepting components 401 and the second sub-intercepting components 402 can have a certain degree of structural strength, so as to withstand the action of high-pressure flue gas when the battery monomer 100 is in thermal runaway, keep the overall shape of the intercepting component 40 almost unchanged, and prevent the overall structure of the intercepting component 40 from collapsing, thereby ensuring that the pole piece fragments can be effectively intercepted by the intercepting component 40 and improving the safety performance of the battery monomer 100.

[0118] In some embodiments of the present application, the intercepting component 40 is a ceramic piece. In the present embodiment, the intercepting component 40 made of ceramic material has the characteristics of good temperature resistance and good insulation. In this way, when the intercepting component 40 is assembled to the shell 10, the intercepting component 40 and the electrode assembly 30, the intercepting component 40 and the shell 10, and the intercepting component 40 and the pressure relief structure 20 can always maintain insulation effect, prevent the internal short circuit accident of the battery monomer 100 caused by the increase of the intercepting component 40, and ensure that the battery monomer 100 can always be normally charged and discharged. Moreover, when the battery monomer 100 is in thermal runaway, the container space 13 is in a high temperature state, and the intercepting component 40 made of ceramic material can withstand high temperature. Even if the ambient temperature of the intercepting component 40 is greater than or equal to 500°C, the intercepting component 40 will not collapse due to the influence of high temperature environment, ensuring that the pole piece fragments can be effectively intercepted by the intercepting component 40, and helping to improve the safety performance of the battery monomer 100. The structural collapse of the intercepting component 40 includes but is not limited to: the through hole 41 on the intercepting component 40 is damaged by high temperature, causing the pole piece fragments to pass through the intercepting component 40 and reach the pressure relief structure 20, and then causing the pole piece fragments to be ejected from the pressure relief structure 20 and ignite the flue gas, or the pole piece fragments are accumulated at the pressure relief structure 20, causing the pressure relief structure 20 to be blocked by the pole piece fragments, and finally causing the battery monomer 100 to burst.

[0119] As shown in FIG. 7-1 and FIG. 7-2, in some embodiments of the present application, the intercepting component 40 comprises a metal plate 408 and an insulating layer 409, the insulating layer 409 is arranged on the metal plate 408, and the hole wall of the through hole 41 is covered by the insulating layer 409, so as to ensure that the outside of the whole intercepting component 40 is insulated from the electrode assembly 30, and the melting point of the metal plate 408 is higher than that of the insulating layer 409. In this embodiment, the insulating layer 409 comprises but is not limited to insulating plastic or insulating rubber, and the insulating layer 409 can meet the condition that it will not melt to expose the metal plate 408 when the ambient temperature is less than or equal to 100℃, ensuring the insulation performance of the whole intercepting component 40. Moreover, the metal plate 408 can effectively improve the structural strength of the whole intercepting component 40, so that even when the battery monomer 100 is in thermal runaway, the intercepting component 40 will not collapse due to the high temperature environment, ensuring that the electrode piece fragments can be effectively intercepted by the intercepting component 40, which helps to improve the safety performance of the battery monomer 100.

[0120] According to a second aspect of the present application, a battery 200 is provided, as shown in FIG. 15, which comprises the battery monomer 100 as described above. As shown in FIG. 15, the battery 200 comprises a box shell 210 and a plurality of battery monomers 100, the box shell 210 is formed with an assembly space 213, wherein the box shell 210 comprises a box body 211 and a box cover 212, the box cover 212 covers the opening of the box body 211 to form a sealed assembly space 213. The battery monomer 100 is installed in the assembly space 213.

[0121] According to a third aspect of the present application, a power consuming device 300 is provided. The power consuming device 300 comprises the battery 200 as described above, and the battery 200 is used for charging and storing energy, and the battery 200 is used for discharging to provide power for the power consuming load of the power consuming device 300.

[0122] The power consuming device 300 comprises but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. The electric toy can comprise but is not limited to a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc. The spacecraft can comprise but is not limited to an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0123] In some embodiments of the present application, the power consuming device 300 is an electric vehicle, as shown in FIG. 16, the battery 200 is installed on the frame 301 of the electric vehicle. The battery 200 provided by the embodiments of the present application is used to supply power to the driving motor 302 (i.e. the power consuming load of the power consuming device 300) of the electric vehicle, so that the driving motor 302 drives the wheels 303 to rotate, so that the electric vehicle can run normally.

[0124] The above merely provides the optional embodiments of the present application, but not for limiting the present application. Since various modifications and changes can be made to the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall fall into the scope of claims of the present application.

Claims

1. A battery cell, wherein, include: case; A pressure relief structure is installed on the housing; Electrode assembly, disposed within the housing; An insulating element is disposed within the housing and located between the housing and the electrode assembly; An intercepting component is disposed within the housing and located between the pressure relief structure and the electrode assembly. The intercepting component is insulated from the housing. A through hole is provided at the position opposite to the pressure relief structure of the intercepting component. Furthermore, the melting point of the intercepting component is higher than that of the insulating component.

2. The battery cell according to claim 1, wherein, The interceptor component is provided with a plurality of through holes, which are evenly distributed.

3. The battery cell according to claim 2, wherein, The diameters of the multiple through holes are equal; or The diameter of a portion of the through holes, which are positioned directly opposite the pressure relief structure, is smaller than the diameter of the remaining through holes.

4. The battery cell according to claim 1, wherein, The interception component is provided with a plurality of through holes, and the distribution density of a portion of the through holes disposed opposite to the pressure relief structure is greater than the distribution density of the remaining through holes.

5. The battery cell according to any one of claims 1-4, wherein, The housing has a circumferential sidewall and two endwalls connected to both ends of the circumferential sidewall. The pressure relief structure is installed on the endwalls. Along the arrangement direction of the two endwalls, the total projected area of ​​all the through holes is S1, and the projected area of ​​the exhaust channel of the pressure relief structure is S2, where S1≥S2.

6. The battery cell according to claim 5, wherein, The interceptor component has reinforcing ribs on the side surface facing the electrode assembly.

7. The battery cell according to claim 6, wherein, The reinforcing rib abuts against the end face of the electrode assembly facing the interceptor component.

8. The battery cell according to claim 6 or 7, wherein, The reinforcing rib is provided with at least one of the through holes.

9. The battery cell according to claim 7 or 8, wherein, The area of ​​the end face of the electrode assembly facing the interceptor is S3, and the total area of ​​all the reinforcing ribs in contact with the electrode assembly is S4, where S4 ≥ 0.3 * S3.

10. The battery cell according to claim 9, wherein, The intercepting component has a first protrusion on one side surface facing the pressure relief structure, and the first protrusion abuts against the pressure relief structure and / or the end wall on which the pressure relief structure is installed.

11. The battery cell according to claim 10, wherein, The total area of ​​the first protrusion in contact with the end wall is S5, where S5 ≥ 0.1 * S3.

12. The battery cell according to claim 10 or 11, wherein, The interceptor component, the reinforcing rib, and the first protrusion are integrally formed.

13. The battery cell according to any one of claims 1-11, wherein, The intercepting component is spaced apart from the pressure relief structure, and the distance between the surface of the intercepting component facing the pressure relief structure and the pressure relief structure is greater than or equal to 1 mm.

14. The battery cell according to any one of claims 5-13, wherein, The inner wall of the circumferential sidewall is provided with a second protrusion for supporting the interceptor component.

15. The battery cell according to claim 14, wherein, One of the end walls covers the circumferential sidewall to form a receiving space and has a third protrusion on the side facing the intercepting member, the intercepting member being held between the second protrusion and the third protrusion.

16. The battery cell according to claim 15, wherein, There are multiple third protrusions and multiple second protrusions, and each of the multiple third protrusions is arranged in a one-to-one correspondence with the multiple second protrusions.

17. The battery cell according to any one of claims 14-16, wherein, The cross-sectional shape of the housing perpendicular to the arrangement direction of the two end walls is square, and a plurality of second protrusions are respectively disposed at the corner positions of the circumferential side walls.

18. The battery cell according to claim 17, wherein, Each of the second protrusions is configured with an arcuate surface that is recessed in a direction away from the receiving space on the side facing the receiving space.

19. The battery cell according to any one of claims 1-18, wherein, The electrode assembly is provided with tabs, and the interceptor is provided with mounting holes through which the tabs pass.

20. The battery cell according to any one of claims 1-19, wherein, The interception component includes a first sub-interception component and a second sub-interception component. The first sub-interception component is provided with a first mating structure, and the second sub-interception component is provided with a second mating structure. The first mating structure and the second mating structure are adapted to be connected.

21. The battery cell according to claim 20, wherein, There are multiple first sub-interceptors and multiple second sub-interceptors, and the first sub-interceptors and the second sub-interceptors are distributed alternately in sequence.

22. The battery cell according to claim 20 or 21, wherein, The first mating structure and the second mating structure are interlocked or engaged with each other.

23. The battery cell according to any one of claims 1-22, wherein, The interceptor component is a ceramic part.

24. The battery cell according to any one of claims 1-22, wherein, The interception component includes a metal plate and an insulating layer. The insulating layer is disposed on the metal plate and is used to insulate the metal plate from the electrode assembly. The melting point of the metal plate is greater than the melting point of the insulating layer.

25. A battery, wherein, The battery comprises a single battery cell as described in any one of claims 1-24.

26. An electrical appliance, wherein, The electrical device includes the battery as described in claim 24.

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