Battery monomer, battery and electric equipment

Abstract

The utility model discloses a battery monomer, a battery and electric equipment. The battery cell comprises: a housing; the pressure relief structure is mounted on the shell; the electrode assembly is arranged in the shell; the insulating part is arranged in the shell and is positioned between the shell and the electrode assembly; the intercepting part is arranged in the shell and located between the pressure relief structure and the electrode assembly, the intercepting part and the shell are arranged in an insulating mode, a through hole is formed in the position, opposite to the pressure relief structure, of the intercepting part, and the melting point of the intercepting part is higher than that of the insulating part. The technical scheme includes but is not limited to solving the problem that in the prior art, when thermal runaway happens to the single battery, the pole piece fragments sprayed out along with the smoke can ignite the smoke.

Description

Technical Field

[0001] This application relates to the technical field of battery devices, and particularly to a battery cell, a battery and an electrical device. Background Art

[0002] A battery generally includes a plurality of battery cells. The plurality of battery cells are assembled in a casing and electrically connected in series, in parallel or in a hybrid connection. During the use of the battery, due to the action of the external environment or the aging of the battery cells themselves during use, thermal runaway is likely to occur, resulting in battery damage.

[0003] When thermal runaway occurs in a battery cell, high-temperature and high-pressure flue gas is generated inside the battery cell, and the electrode sheets of the electrode assembly of the battery cell may break, and then relatively large electrode sheet fragments are generated. These relatively large electrode sheet fragments will be ejected from the pressure relief structure together with the high-temperature and high-pressure flue gas. When the high-temperature and high-pressure flue gas contacts the air, since the ejected flue gas contains high-temperature electrode sheet fragments, the electrode sheet fragments may ignite the flue gas like a fire source, and even explode severely. Utility Model Content

[0004] The purpose of the embodiments of this application is to provide a battery cell, a battery and an electrical device, including but not limited to solving the problem that the electrode sheet fragments ejected together with the flue gas when thermal runaway occurs in the battery cell in the related art may ignite the flue gas.

[0005] The technical solution adopted in the embodiments of this application is:

[0006] According to the first aspect of this application, a battery cell is provided, including:

[0007] A casing;

[0008] A pressure relief structure installed on the casing;

[0009] An electrode assembly disposed inside the casing;

[0010] An insulating member disposed inside the casing and located between the casing and the electrode assembly to insulate the casing and the electrode assembly;

[0011] An intercepting member disposed inside the casing and located between the pressure relief structure and the electrode assembly. The intercepting member is insulated from the casing. At least one through hole is provided at a position of the intercepting member opposite to the pressure relief structure, and the melting point of the intercepting member is higher than the melting point of the insulating member.

[0012] An interception component is provided in the accommodation space of the battery cell of the present application, and the interception component is located between the pressure relief structure and the electrode assembly. In this way, when the battery cell undergoes thermal runaway, the flue gas can flow through the through holes of the interception component towards the pressure relief structure and be ejected, and the relatively large electrode fragments mixed in the flue gas are intercepted by the interception component, so that the electrode fragments cannot reach the pressure relief structure through the interception plate. In this way, the flue gas ejected from the inside of the battery cell through the pressure relief structure contains fewer mixed electrode fragments, reducing the possibility that the flue gas is ignited by the high-temperature electrode fragments when it comes into contact with the air during ejection, and improving the safety of the battery cell. Moreover, since the melting point of the interception component is higher than that of the insulating component, when the battery cell undergoes thermal runaway, even if the insulating component inside it has melted into fragments, the interception component will not melt and remains intact, thereby blocking the fragments formed by the melting of the insulating component. The fragments formed by the melting of the insulating component will not be ejected to contact the air, and the intercepted fragments will not contaminate other battery cells in the battery.

[0013] In some embodiments of the present application, the interception component is provided with a plurality of through holes, the plurality of through holes are evenly distributed, and the plurality of through holes are arranged in a rectangular array. The arrangement in a rectangular array makes the arrangement rules of the plurality of through holes clear and obvious, which is beneficial to reducing the processing of opening each through hole on the interception component and improving the processing efficiency of opening through holes.

[0014] In some embodiments of the present application, the apertures of the plurality of through holes are equal. When the battery cell undergoes thermal runaway, the flue gas generated inside the battery cell can quickly flow through each through hole.

[0015] In some embodiments of the present application, the apertures of a part of the through holes facing the pressure relief structure are smaller than those of the remaining through holes. By setting the apertures of a part of the through holes facing the pressure relief structure to be smaller, the electrode fragments can be effectively intercepted.

[0016] In some embodiments of the present application, the distribution density of a part of the through holes facing the pressure relief structure is greater than that of the remaining through holes, so as to effectively intercept the electrode fragments.

[0017] In some embodiments of the present application, the housing has a circumferential side wall and two end walls connected to both ends of the circumferential side wall. The pressure relief structure is installed on the end wall. Along the arrangement direction of the two end walls, the total vertical projection area of all through holes is S1, and the vertical projection area of the exhaust passage of the pressure relief structure is S2, and S1≥S2, which ensures that the flue gas can efficiently pass through the interception component and avoid the accumulation of flue gas.

[0018] In some embodiments of the present application, a reinforcing rib is provided on the surface of the interception component facing the electrode assembly, which is beneficial to improving the overall structural strength of the interception component.

[0019] In some embodiments of the present application, the reinforcing rib abuts against the end face of the electrode assembly facing the interception component. In this way, the electrode assembly is restricted, so that the electrode assembly always maintains a relative position stationary relative to the housing during the process of thermal runaway, and it is possible to avoid the situation where stress concentration points exist between the electrode assembly and the interception component or between the electrode assembly and the housing.

[0020] In some embodiments of the present application, the reinforcing rib is provided with at least one through hole. This is used to improve the flow efficiency of the flue gas flowing through the interception component and reaching the pressure relief structure.

[0021] In some embodiments of the present application, the area of the end face of the electrode assembly facing the interception component is S3, and the total contact area of all the reinforcing ribs 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 rib and the end face of the electrode assembly, and it is ensured that stress concentration points will not be generated on the electrode assembly by the reinforcing rib due to too small mutual contact area.

[0022] In some embodiments of the present application, a first protrusion is provided on one side surface of the interception component 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. The interception component is restricted from being recessed and deformed in the direction towards the pressure relief structure, thereby preventing the interception component from contacting the pressure relief structure after deformation and causing blockage of the exhaust passage.

[0023] In some embodiments of the present application, the total contact area of all the first protrusions 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 protrusion and the pressure relief structure and / or the end wall, thereby preventing stress concentration points from being generated on the pressure relief structure and / or the end wall by the first protrusion.

[0024] In some embodiments of the present application, the interception component, the reinforcing rib and the first protrusion are integrally formed, which helps to improve the processing and production efficiency of the components.

[0025] In some embodiments of the present application, the interception component and the pressure relief structure are arranged at intervals, and the interval between the surface of the interception component facing the pressure relief structure and the pressure relief structure is greater than or equal to 1 mm. In this way, the flue gas can flow smoothly from the through hole of the interception component to the pressure relief structure, and then the flue gas can be smoothly discharged from the pressure relief structure.

[0026] In some embodiments of the present application, a plurality of second protrusions for supporting the interception component are provided at intervals on the inner wall of the circumferential side wall, which greatly improves the assembly efficiency of the interception component, thereby improving the assembly and production efficiency of the battery cell.

[0027] In some embodiments of the present application, an end wall covers the circumferential side wall to form an accommodation space, and a third protrusion is provided on the side facing the interception component, and the interception component is clamped between the second protrusion and the third protrusion.

[0028] In some embodiments of the present application, both the third protrusions and the second protrusions are multiple, and the multiple third protrusions are arranged in one-to-one correspondence with the multiple second protrusions.

[0029] In some embodiments of the present application, the cross-sectional shape of the housing perpendicular to the arrangement direction of the two end walls is square, and the multiple second protrusions are arranged in one-to-one correspondence at the corner positions of the circumferential side wall.

[0030] In some embodiments of the present application, the side of each second protrusion facing the accommodation space is set as an arc surface that is recessed away from the accommodation space. The arc surfaces on each second protrusion can smoothly avoid the electrode assembly, enabling the electrode assembly to make full use of the accommodation space, thereby improving the energy density of the battery cell.

[0031] In some embodiments of the present application, the electrode assembly is provided with a tab, and the interception component is provided with an assembly hole for the tab to pass through. In this way, the tab can smoothly avoid the interception component to complete electrical connection with the electrode post structure installed on the end wall, improving the assembly efficiency.

[0032] In some embodiments of the present application, 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 matching structure, and the second sub-interception component is provided with a second matching structure, and the first matching structure and the second matching structure are adaptively connected.

[0033] In some embodiments of the present application, both the first sub-interception component and the second sub-interception component are multiple, and the first sub-interception component and the second sub-interception component are alternately distributed in sequence.

[0034] In some embodiments of the present application, the first matching structure and the second matching structure are mutually clamped or mutually engaged.

[0035] In some embodiments of the present application, the interception component is a ceramic part. The interception component made of ceramic material has the characteristics of good heat resistance and good insulation.

[0036] In some embodiments of the present application, the interception 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 greater than the melting point of the insulating layer. The insulating layer ensures the overall insulation performance of the interception component, and since the melting point of the metal plate is higher than that 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 interception component.

[0037] According to a second aspect of the present application, a battery is provided, which includes the battery cell as described above.

[0038] According to a third aspect of the present application, an electrical device is provided, which includes the battery as described above. Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 is an exploded schematic view of a battery cell provided by an embodiment of the present application;

[0041] Figure 2 is another exploded schematic view of a battery cell provided by an embodiment of the present application;

[0042] Figure 3 is still another exploded schematic view of a battery cell provided by an embodiment of the present application;

[0043] Figure 4-1 is a schematic structural view of the housing main body of the housing of the battery cell in the embodiment of the present application;

[0044] Figure 4-2 is Figure 4-1 an enlarged schematic view of part A in;

[0045] Figure 5 is a schematic structural view of an interception component adopted by the battery cell of the present application, wherein the apertures of the through holes are all equal;

[0046] Figure 6 is a front view schematic view of an interception component adopted by the battery cell of the present application, wherein the interception component includes a metal plate member and an insulating layer;

[0047] Figure 7-1 is Figure 6 a cross-sectional view taken along the B-B direction in;

[0048] Figure 7-2 is Figure 7-1 an enlarged schematic view of part C in;

[0049] Figure 8 is a schematic structural view of an interception component adopted by the battery cell of the present application, wherein the apertures of the through holes are not equal;

[0050] Figure 9It is a schematic structural diagram of an interception component adopted by a battery cell of the present application. Among them, the interception component is provided with reinforcing ribs;

[0051] Figure 10 It is a schematic structural diagram of an interception component adopted by a battery cell of the present application. Among them, the interception component is provided with reinforcing ribs and a first protrusion;

[0052] Figure 11 It is a schematic structural diagram of an interception component adopted by a battery cell of the present application. Among them, the reinforcing ribs are arranged in a crisscross form;

[0053] Figure 12 It is a schematic structural diagram of an interception component adopted by a battery cell of the present application. Among them, the interception component is provided with assembly holes;

[0054] Figure 13 It is a schematic structural diagram of an interception component adopted by a battery cell of the present application. Among them, the interception component is formed by splicing a first sub-interception component, a second sub-interception component and the first sub-interception component;

[0055] Figure 14 It is a schematic structural diagram of an interception component adopted by a battery cell of the present application. Among them, the interception component is formed by splicing and biting the first sub-interception component and the second sub-interception component through a first biting edge and a second biting edge;

[0056] Figure 15 It is an exploded view of a battery provided by an embodiment of the present application;

[0057] Figure 16 It is a schematic structural diagram of an electrical device provided by an embodiment of the present application.

[0058] Among them, each reference numeral in the figure is:

[0059] 100, battery cell;

[0060] 10, housing; 101, housing main body; 11, circumferential side wall; 111, second protrusion; 112, arc surface; 12, end wall; 13, accommodation space; 102, cover body; 15, electrode post structure;

[0061] 20, pressure relief structure;

[0062] 30, electrode assembly; 31, tab; 32, transition fillet;

[0063] 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 engaging edge; 407. Second engaging edge; 408. Metal plate component; 409. Insulating layer;

[0064] 200. Battery; 210. Case; 211. Case body; 212. Case cover; 213. Assembly space;

[0065] 300. Electrical equipment; 301. Frame; 302. Driving motor; 303. Wheel. Specific implementation manners

[0066] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the invention, and are not used to limit the present application.

[0067] It should be noted that when a component is referred to as "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 "connected to" another component, it can be directly or indirectly connected to the other component. The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations. The terms "first" and "second" are only used for the purpose of convenient description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a plurality" is two or more, unless otherwise specifically and clearly defined.

[0068] Currently, new energy, that is, renewable energy, is becoming increasingly important in social development, and the application and popularization of new energy are also developing at a high speed. New energy includes, but is not limited to, solar energy, wind energy, geothermal energy, tidal energy, etc. These renewable energies are converted into electrical energy that is convenient for storage and utilization, and are applied to all walks of life through the way of electrical energy output. To store the electrical energy converted from renewable energy, new energy batteries are indispensable. New energy batteries include, but are not limited to, lithium batteries, nickel-metal hydride batteries, lead-acid batteries, etc. Among them, lithium batteries have more prominent advantages compared with other types of batteries. Therefore, all enterprises, institutions, universities, research institutes, etc. are vigorously researching and developing lithium batteries. Hereinafter, new energy batteries are collectively referred to as batteries.

[0069] Generally, a battery includes at least one battery cell. Most batteries are assembled with multiple battery cells to meet the demand for large power. Hereinafter, the battery will be described by taking the example of being assembled with multiple battery cells. The multiple battery cells are electrically connected in parallel, in series, or in a combined series-parallel connection to output electrical energy with the required output voltage and output current.

[0070] During the use of the battery, it is inevitable that the battery 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 during use (such as abnormal use environments like overcharging, over-discharging, extrusion, collision, etc.). All of the above factors may cause the battery cells of the battery to be prone to thermal runaway.

[0071] In the related art, when a battery cell undergoes thermal runaway, high-temperature and high-pressure flue gas is generated inside the battery cell, and the electrode sheets of the electrode assembly of the battery cell may break, and then relatively large electrode sheet fragments are generated. These relatively large electrode sheet fragments will be ejected from the pressure relief structure together with the high-temperature and high-pressure flue gas. When the high-temperature and high-pressure flue gas contacts the air, due to the high-temperature electrode sheet fragments mixed in the flue gas, the electrode sheet fragments may ignite the flue gas like a fire source, and even explode severely.

[0072] Based on the above considerations, the present application provides a battery cell, and multiple such battery cells are assembled and formed into a battery, and the formed battery is applied to an electrical device for power supply. Among them, an interception component is additionally designed in the housing of the battery cell provided by the present application, that is, the interception component is arranged in the housing and is located between the pressure relief structure and the electrode assembly of the battery cell. In this way, when the battery cell undergoes thermal runaway, inside the battery cell, the electrode sheet fragments mixed in the flue gas will be intercepted by the interception component, so that the electrode sheet fragments cannot reach the pressure relief structure through the interception plate component. In this way, the electrode sheet fragments mixed in the flue gas ejected from the pressure relief structure inside the battery cell are reduced, and the possibility that the flue gas is ignited by the high-temperature electrode sheet fragments when it is ejected and contacts the air is reduced, and the safety of the battery cell is improved.

[0073] In order to illustrate the technical solution provided by the present application, the following will be described in detail with reference to specific drawings and embodiments.

[0074] As Figures 1 to 3As shown in the figure, the present application provides a battery cell 100, which includes a housing 10, a pressure relief structure 20, an electrode assembly 30, an insulating member (not shown), and an interception member 40. The pressure relief structure 20 is installed on the housing 10, the electrode assembly 30 is disposed within the housing 10, and the insulating member is disposed within the housing 10 and located between the housing 10 and the electrode assembly 30 to insulate the housing 10 and the electrode assembly 30. The interception member 40 is disposed within the housing 10 and located between the pressure relief structure 20 and the electrode assembly 30. The interception member 40 is insulated from the housing 10, and a through hole 41 is provided at a position of the interception member 40 opposite to the pressure relief structure 20. Moreover, the melting point of the interception member 40 is higher than that of the insulating member.

[0075] Among them, the insulating member refers to an isolation member in the battery cell 100 for ensuring insulation between the electrode assembly 30 and the metal housing 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 housing 10, etc.

[0076] In some embodiments of the present application, the housing 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 an accommodation space 13, and the pressure relief structure 20 is installed on at least one end wall 12. When the battery cell 100 is a cylindrical cell, both 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 end walls 12. When the battery cell 100 is a square cell, the housing 10 of the battery cell 100 at this time is in the shape of 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, taking the battery cell 100 as a square cell and the pressure relief structure 20 being installed on one of the end walls 12 as an example for illustration.

[0077] When the interception member 40 is assembled in the accommodation space 13, the accommodation space 13 is divided by the interception member 40 into a first space and a second space. The first space is the space on the side of the interception member 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 interception member 40 facing the pressure relief structure 20. The first space and the second space are connected through the through hole 41 on the interception member 40. When thermal runaway occurs in the battery cell 100, high-temperature and high-pressure flue gas is first generated in the first space, and relatively large electrode sheet fragments are easily mixed in the flue gas. Then, the flue gas flows into the second space through the through hole 41 on the interception member 40, and the second space is filled with the flue gas. Subsequently, under the action of the high temperature and high pressure of the flue gas in the second space, the exhaust passage of the pressure relief structure 20 is opened, enabling the flue gas in the second space to be smoothly discharged.

[0078] An interception component 40 is provided in the accommodation space 13 of the battery cell 100 provided in this application, and the interception component 40 is located between the pressure relief structure 20 and the electrode assembly 30. Thus, when the battery cell 100 undergoes a thermal runaway, the flue gas can flow from the through hole 41 of the interception component 40 towards the pressure relief structure 20 and be ejected, and the relatively large-sized electrode sheet fragments mixed in the flue gas inside the battery cell 100 are intercepted by the interception component 40, so that the electrode sheet fragments cannot pass through the interception component 40 and reach the pressure relief structure 20. In this way, the electrode sheet fragments mixed in the flue gas ejected from the inside of the battery cell 100 through the pressure relief structure 20 are reduced, and the possibility that the flue gas is ignited by the high-temperature electrode sheet fragments when coming into contact with the air during ejection is decreased, improving the safety of the battery cell 100. Moreover, since the melting point of the interception component 40 is higher than that of the insulating part, when the battery cell 100 undergoes a thermal runaway, even if the insulating part inside it has been melted into fragments, the interception component 40 will not melt and remains intact, thereby blocking the fragments formed by the melting of the insulating part. The fragments formed by the melting of the insulating part will not be ejected to come into contact with the air, and the intercepted fragments will not contaminate other battery cells 100 in the battery 200.

[0079] Moreover, since the interception component 40 intercepts the electrode sheet fragments in the first space, the possibility that the electrode sheet fragments flow to the pressure relief structure 20 along with the flue gas is reduced. Thus, not only the possibility that the electrode sheet fragments are ejected from the pressure relief structure 20 is decreased, thereby reducing the possibility that the ejected electrode sheet fragments ignite the flue gas, but also the reduced possibility that the electrode sheet fragments reach the pressure relief structure 20 decreases the possibility that the electrode sheet fragments accumulate at the pressure relief structure 20 and block the pressure relief structure 20, preventing the battery cell 100 from bursting, which is beneficial to improving the safety performance of the battery cell 100.

[0080] In addition, if the electrode piece fragments eject outside the battery cell 100, these electrode piece fragments can generally conduct electricity. When these electrode piece fragments eject outside the battery cell 100, they will contact the electrode post structure 15 of other battery cells 100 of the battery 200 and other electronic devices, thereby causing an internal short circuit in the battery 200 and resulting in the complete damage of the battery 200. However, since the battery 200 provided in this application is assembled using the battery cell 100 provided in this application, and the relatively large electrode piece fragments in the flue gas inside the battery cell 100 are intercepted by the interception component 40, that is, the ejection of electrode piece fragments outside the battery cell 100 is greatly reduced. Therefore, even when one or several battery cells 100 in the battery 200 undergo thermal runaway, the probability of the battery 200 being completely damaged due to an internal short circuit caused by the ejected electrode piece fragments can be greatly reduced, improving the safety of the battery 200. And after replacing the damaged battery cell 100 with a new battery cell 100 through maintenance work, the battery 200 can still continue to be used normally, improving the service life of the battery 200.

[0081] Wherein: The pressure relief structure 20 refers to an element or component that actuates to release the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a predetermined threshold. Herein, "actuate" means that the pressure relief structure 20 generates an action, so that the internal pressure and temperature of the battery cell 100 can be released from the exhaust passage. The action generated by the pressure relief structure 20 may include, but is not limited to: at least a part of the pressure relief structure 20 rupturing, being torn, or melting, etc. After the pressure relief structure 20 actuates, the high-temperature flue gas inside the battery cell 100 will discharge outward from the exhaust passage of the pressure relief structure 20. This predetermined threshold can be adjusted according to different design requirements. The predetermined threshold may depend on one or several materials among the positive electrode piece, negative electrode piece, electrolyte, and separator in the battery cell 100. The pressure relief structure 20 can adopt elements or components such as pressure-sensitive or temperature-sensitive ones, that is, when the internal pressure or temperature of the battery cell 100 reaches the predetermined threshold, the pressure relief structure 20 actuates, thereby forming a channel for releasing the internal pressure.

[0082] Such as Figures 1 to 3 、 Figures 5 to 14As shown, in some embodiments of the present application, the interception component 40 is provided with a plurality of through holes 41, and the plurality of through holes 41 are evenly distributed. When the battery cell 100 undergoes thermal runaway, the flue gas generated inside the battery cell 100 can pass through the plurality of through holes 41 of the interception component 40 and flow towards the pressure relief structure 20, improving the flow efficiency of the flue gas flowing towards the pressure relief structure 20. When the flue gas flows to the pressure relief structure 20, under the action of the high temperature and high pressure of the flue gas, the exhaust passage of the pressure relief structure 20 opens, enabling the flue gas to be discharged smoothly, avoiding the continuous accumulation of flue gas inside the battery cell 100 resulting in the expansion and even explosion of the housing 10.

[0083] Further, as Figures 5 to 14 shown, the plurality of through holes 41 can, but are not limited to, be arranged in a rectangular array. The arrangement in a rectangular array makes the arrangement rule of the plurality of through holes 41 clear and obvious, which is beneficial to reducing the processing of opening each through hole 41 on the interception component 40 and improving the processing efficiency of opening the through holes 41.

[0084] In some other embodiments of the present application, the plurality of through holes 41 can also be randomly distributed.

[0085] As Figure 5 and Figure 6 shown, in the interception component 40 of some embodiments of the present application, the apertures of the plurality of through holes 41 are equal, that is, the flow-through efficiency of each through hole 41 for the flue gas is equal. When the battery cell 100 undergoes thermal runaway, the flue gas generated inside the battery cell 100 can flow through each through hole 41 quickly and then flow towards the pressure relief structure 20. Then, under the action of the high temperature and high pressure of the flue gas, the exhaust passage of the pressure relief structure 20 opens, enabling the flue gas to be discharged smoothly, avoiding the continuous accumulation of flue gas inside the battery cell 100 resulting in the expansion and even explosion of the housing 10.

[0086] As Figure 8As shown, in the interception component 40 of some embodiments of the present application, the aperture of a part of the through holes 41 facing the pressure relief structure 20 is smaller than that of the remaining through holes 41. When the exhaust passage of the pressure relief structure 20 is opened, at this time, the smoke flow velocity of the through holes 41 in the area of the interception component 40 facing the exhaust passage of the pressure relief structure 20 is the largest. In order to prevent the pole piece fragments from possibly squeezing through the through holes 41 under the action of the smoke flow velocity, therefore, the aperture of a part of the through holes 41 facing the pressure relief structure 20 is set to be smaller, so as to effectively intercept the pole piece fragments. And, in order to ensure that the smoke can efficiently pass through the interception component 40 and avoid smoke accumulation, therefore, the aperture of the remaining through holes 41 is designed to be larger, so that the smoke can quickly pass through the interception component 40 and flow towards the pressure relief structure 20. It should be noted that: whether the aperture of the through hole 41 is designed to be larger or smaller is relative, that is, a relative comparison is made between the aperture of a part of the through holes 41 facing the pressure relief structure 20 and the aperture of the through holes 41 at other positions of the interception component 40, so as to obtain the comparison result that the aperture of the through hole 41 is set to be smaller or larger.

[0087] Preferably, in some embodiments of the present application, the distribution density of a part of the through holes 41 facing the pressure relief structure 20 is greater than that of the remaining through holes 41. And, the aperture of a part of the through holes 41 facing the pressure relief structure 20 is smaller than that of the remaining through holes 41; or, the apertures of all the through holes 41 are equal.

[0088] In order to ensure that the smoke can efficiently pass through the interception component 40 and avoid smoke accumulation, in some embodiments of the present application, along the arrangement direction of the two end walls 12, the total vertical projection area of all the through holes 41 is S1, and the vertical projection area of the exhaust passage of the pressure relief structure 20 is S2, and S1≥S2. When there is no interception component in the battery cell 100, when the battery cell 100 undergoes thermal runaway, the smoke generated inside the battery cell 100 will directly be discharged from the pressure relief structure 20 when the internal space of the battery cell 100 is filled. Compared with the battery cell 100 without the interception component 40 in the accommodation space 13 in the related art, although the interception component 40 is additionally provided in the accommodation space 13 of the battery cell 100 of the present application, but because S1≥S2, therefore, the smoke in the first space can quickly flow through the through holes 41 of the interception component 40 and enter the second space, so that the smoke will not be intercepted by the interception component 40 and stay and accumulate in the first space, and the smoke in the second space is discharged from the pressure relief structure 20. Therefore, compared with the battery cell 100 without the interception component 40 in the accommodation space 13 in the related art, the battery cell 100 of the present application can ensure that the internal pressure relief rate of the battery cell 100 will not be significantly reduced due to the additional setting of the interception component 40.

[0089] Preferably, in some embodiments of the present application, S1≥1.2*S2, so as to more ensure that the pressure relief rate inside the battery cell 100 will not be significantly decreased due to the addition of the interception component 40.

[0090] As Figures 9 to 11 shown, in the interception component 40 of some embodiments of the present application, a reinforcing rib 42 is provided on the surface of the interception component 40 facing the electrode assembly 30. Thus, it is beneficial to improve the overall structural strength of the interception component 40. When the battery cell 100 undergoes thermal runaway, the air pressure in the first space instantaneously increases, causing an instantaneous air pressure difference on both sides of the interception component 40 facing the first space and the second space. Since the reinforcing rib 42 is provided on the interception component 40 to improve the overall structural strength of the interception component 40, the interception component 40 can withstand the instantaneous air pressure difference, so that the interception component 40 can remain unchanged in shape during the thermal runaway process.

[0091] In some embodiments of the present application, the reinforcing rib 42 abuts against the end face of the electrode assembly 30 facing the interception component 40. When the battery cell 100 undergoes thermal runaway, due to the influence of the high-temperature and high-pressure flue gas on the electrode assembly 30 in the first space, the electrode assembly 30 has a tendency to move towards the interception component 40 along with the flue gas. Therefore, in the battery cell 100, by the reinforcing rib 42 abutting against the end face of the electrode assembly 30 facing the interception component 40, the electrode assembly 30 is restricted, so that the electrode assembly 30 always maintains a relative position stationary with respect to the housing 10 during the thermal runaway process. That is, during the thermal runaway process of the battery cell 100, the electrode assembly 30 will not move towards the interception component 40 relative to the housing 10. Thus, during the thermal runaway process, the situation where there is a stress concentration point between the electrode assembly 30 and the interception component 40, or between the electrode assembly 30 and the housing 10, can be avoided.

[0092] When there is a stress concentration point between the electrode assembly 30 and the interception component 40 during the thermal runaway process, that is, 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 numbers of electrode sheet fragments.

[0093] When there is a stress concentration point between the electrode assembly 30 and the housing 10 during thermal runaway, it may be that the electrode assembly 30 deflects laterally and collides with the circumferential side wall 11 to generate a stress concentration point. At this time, the circumferential side wall 11 is subjected to stress concentration and may be damaged and cracked under the high pressure of the flue gas in the first space, and then affect other battery cells 100 of the battery 200. Or, when there is a stress concentration point between the electrode assembly 30 and the housing 10 during thermal runaway, it may 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 housing 10, resulting in the failure of the assembly relationship between the electrode post structure 15 and the end wall 12, and then affecting other battery cells 100 of the battery 200.

[0094] In some embodiments of the present application, as Figure 9 shown, the reinforcing rib 42 is provided with at least one through hole 41. In this way, while the overall structural strength of the interception component 40 is improved by the reinforcing rib 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 accumulate in the first space.

[0095] In some embodiments of the present application, the area of the end face of the electrode assembly 30 facing the interception component 40 is S3, and the total contact area of all the reinforcing ribs 42 with the electrode assembly 30 is S4, and S4≥0.3*S3. In this way, it can be ensured that there is a sufficient contact area between the reinforcing rib 42 and the end face of the electrode assembly 30, and it is ensured that there will be no stress concentration point generated by the reinforcing rib 42 on the electrode assembly 30 due to too small mutual contact area, so as to ensure that the electrode assembly 30 will not generate more pole piece fragments during thermal runaway.

[0096] In some embodiments of the present application, as Figure 10As shown, a first protrusion 43 is provided on one side surface of the interception member 40 facing the pressure relief structure 20, and the first protrusion 43 abuts against the end wall 12 where the pressure relief structure 20 is installed. The setting of the first protrusion 43 can not only enhance the overall structural strength of the interception member 40, but also, the first protrusion 43 abuts against the end wall 12. Thus, under the action of the flue gas with a rapidly increasing air pressure in the first space, the interception member 40 is restricted from deforming and denting in the direction towards the pressure relief structure 20, thereby preventing the interception member 40 from contacting the pressure relief structure 20 after deformation and blocking the exhaust passage, and enabling the flue gas to be smoothly discharged from the pressure relief structure 20. Further, when a part of the first protrusion 43 abuts against the pressure relief structure 20, through holes 41 are provided in these first protrusions 43. In this way, the flue gas in the first space can flow towards the pressure relief structure 20 through the through holes 41 in these first protrusions 43, and then the flue gas can be smoothly discharged from the pressure relief structure 20, reducing the obstruction of the first protrusion 43 to the flow of the flue gas towards the pressure relief structure 20 and ensuring the discharge rate of the flue gas, that is, ensuring that the pressure relief rate inside the battery cell 100 will not be significantly decreased due to the setting of the first protrusion 43 on the interception member 40.

[0097] When the battery cell 100 undergoes thermal runaway, in order to avoid stress concentration points being generated on the end wall 12 by the first protrusion 43, therefore, the total contact area of all the first protrusions 43 with the end wall 12 is S5, and the area of the end face of the electrode assembly 30 facing the interception member 40 is S3, and S5 ≥ 0.1 * S3. In the battery cell 100 of the present application, when all the first protrusions 43 abut against the end wall 12, since the area of the side surface of the end wall 12 facing the interception member 40 is basically equal to the area S3 of the end face of the electrode assembly 30 facing the interception member 40 (although the area of the side surface of the end wall 12 facing the interception member 40 is slightly larger than the area S3 of the end face of the electrode assembly 30 facing the interception member 40, but the difference is small and the area difference between the two can be ignored), therefore, the parameter design of S5 ≥ 0.1 * S3 can meet the design requirements. In this way, it can be ensured that there is sufficient contact area between the first protrusion 43 and the end wall 12, thereby preventing stress concentration points from being generated on the end wall 12 by the first protrusion 43.

[0098] In some other embodiments of the present application, a reinforcing rib 42 is provided on one side surface of the intercepting member 40 facing the electrode assembly 30, and a first protrusion 43 is provided on one side surface of the intercepting member 40 facing the pressure relief structure 20. Moreover, the reinforcing rib 42 abuts against the end face of the electrode assembly 30 facing the intercepting member 40, and the first protrusion 43 abuts against the end wall 12 where the pressure relief structure 20 is installed. In this embodiment, the reinforcing rib 42 is provided with a through hole 41, and the first protrusion 43 is also provided with a through hole 41. Further, the reinforcing ribs 42 and the first protrusions 43 can be provided in a 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 and communicate with each other. In this way, the reinforcing rib 42 and the first protrusion 43 are respectively provided on both sides of the intercepting member 40, significantly enhancing the overall structural strength of the intercepting member 40. Moreover, by providing the through holes 41 on the reinforcing rib 42 and the first protrusion 43, the flow rate of the flue gas flowing from the first space into the second space is ensured, the emission rate of the flue gas is ensured, and thus the situation that the pressure relief rate inside the battery cell 100 is significantly decreased due to the additional installation of the intercepting member 40 in the accommodation space 13 is avoided.

[0099] In some embodiments of the present application, the intercepting member 40, the reinforcing rib 42 and the first protrusion 43 are relatively independent components respectively, that is, the reinforcing rib 42 and the first protrusion 43 are respectively connected and fixed to the intercepting member 40. Therefore, the intercepting member 40 and the pressure relief structure 20 are arranged at intervals. At this time, the first protrusion 43 is located in the interval space between the intercepting member 40 and the pressure relief structure 20, and the interval size between the surface of the intercepting member 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 protrusion 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. At this time, the intercepting member 40 is a single plate-like component, and the reinforcing rib 42 and the first protrusion 43 are relatively independent structural components additionally provided on the plate-like component.

[0100] In some embodiments of the present application, the first protrusion 43 is not provided on the intercepting member 40, and the intercepting member 40 and the pressure relief structure 20 are arranged at intervals, and the interval size between the surface of the intercepting member 40 facing the pressure relief structure 20 and the pressure relief structure 20 is greater than or equal to 1 mm. This enables the flue gas to smoothly reach the pressure relief structure 20 after flowing into the second space from the through hole 41 of the intercepting member 40, and then the flue gas can be smoothly discharged from the pressure relief structure 20.

[0101] Preferably, the distance between the surface of the intercepting member 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 enables the flue gas to reach the pressure relief structure 20 more smoothly after flowing into the second space through the through holes 41 of the intercepting member 40, and then the flue gas is discharged from the pressure relief structure 20 more smoothly.

[0102] In some other embodiments of the present application, the intercepting member 40, the reinforcing rib 42 and the first protrusion 43 are integrally formed. Thus, by using die-casting process, forging process, casting process, etc. to integrally form the intercepting member 40, the reinforcing rib 42 and the first protrusion 43, not only the structural strength between the intercepting member 40, the reinforcing rib 42 and the first protrusion 43 is ensured, but also the processing and production efficiency of the components is improved.

[0103] In some other embodiments of the present application, the reinforcing rib 42 on the intercepting member 40 may also be provided with a "well"-shaped rib intersecting vertically and horizontally, as Figure 11 shown. And, the top surface of the reinforcing rib 42 does not abut against the end surface of the electrode assembly 30. At this time, the reinforcing rib 42 is only for enhancing the overall structural strength of the intercepting member 40.

[0104] As Figures 1 to 3 shown, in the battery cell 100 of the present application, the circumferential side wall 11 and one end wall 12 connected to one end of the circumferential side wall 11 form the shell body 101, and the other end wall 12 forms the cover body 102 of the housing 10. The cover body 102 covers the opening of the shell body 101 to form the accommodation space 13.

[0105] As Figure 1 and Figure 2 shown, in some embodiments of the present application, the pressure relief structure 20 is installed on the cover body 102, and a plurality of second protrusions 111 for supporting the intercepting member 40 at intervals are provided on the inner wall of the circumferential side wall 11. When assembling the electrode assembly 30 and the intercepting member 40 into the housing 10, first place the electrode assembly 30 into the accommodation space 13, and then place the intercepting member 40 into the accommodation space 13 until the circumferential edge of the intercepting member 40 is simultaneously supported by the plurality of second protrusions 111, then the intercepting member 40 is placed well. At this time, the reinforcing rib 42 on the intercepting member 40 abuts against the end surface of the electrode assembly 30. Then cover the cover body 102 on the shell body 101, and weld the circumferential joint between the cover body 102 and the shell body 101, thereby completing the assembly of the electrode assembly 30 and the intercepting member 40 into the housing 10. This greatly improves the assembly efficiency of the intercepting member 40, thereby improving the assembly and production efficiency of the battery cell 100.

[0106] In some embodiments of the present application, reinforcing ribs 42 and first protrusions 43 are provided on the interception member 40, and second protrusions 111 are provided on the inner wall of the circumferential side wall 11. The pressure relief structure 20 is installed on the cover body 102. When the cover body 102 is covered on the housing main body 101, the inner side wall of the cover body 102 abuts against the first protrusion 43 on the interception member 40, so that the interception member 40 is stably assembled between the pressure relief structure 20 and the electrode assembly 30 through the cooperative structure of the second protrusion 111, the first protrusion 43 and the cover body 102.

[0107] In some embodiments of the present application, reinforcing ribs 42 are provided on the interception member 40, but the first protrusions 43 are not provided. The cover body 102 is provided with a plurality of third protrusions, and second protrusions 111 are provided on the inner wall of the circumferential side wall 11. The pressure relief structure 20 is installed on the cover body 102. When the cover body 102 is covered on the housing main body 101, the interception member 40 is clamped between the second protrusions 111 and the third protrusions. The reinforcing ribs 42 on the interception member 40 abut against the end face of the electrode assembly 30 when the cover body 102 is covered on the housing main body 101. When the interception member 40 is provided with the first protrusions 43, the first protrusions 43 occupy the second space, resulting in the flow of the flue gas in the second space being blocked by the first protrusions 43 during the process of flowing towards the pressure relief structure 20. However, since the interception member 40 in this embodiment is not provided with the first protrusions 43, the second space is unobstructed. Therefore, there are no first protrusions 43 in the second space to block the flow of the flue gas towards the pressure relief structure 20, and the flue gas can flow smoothly towards the pressure relief structure 20.

[0108] Furthermore, the plurality of third protrusions are arranged 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 interception member 40 in one-to-one correspondence.

[0109] In some other embodiments of the present application, the third protrusion may also be a circumferential wall on the circumferential edge area of the cover body 102 facing the electrode assembly 30. When the cover body 102 is covered on the housing main body 101, this circumferential wall abuts against the interception member 40, so that the interception member 40 is stably assembled between the pressure relief structure 20 and the electrode assembly 30.

[0110] Such as Figure 3As shown, in some embodiments of the present application, the interception member 40 is provided with reinforcing ribs 42, but the first protrusion 43 is not provided. The pressure relief structure 20 is installed at the bottom of the housing body 101, that is, the pressure relief structure 20 is installed on the end wall 12 of the housing body 101. When assembling the electrode assembly 30 and the interception member 40 to the housing 10, first place the interception member 40 into the accommodation space 13 until the circumferential edge of the interception member 40 is simultaneously supported by a plurality of second protrusions 111. Then, place the electrode assembly 30 into the accommodation space 13 and make the electrode assembly 30 abut against the reinforcing ribs 42 on the interception member 40. Then, cover the cover body 102 on the housing body 101 so that the inner side wall of the cover body 102 abuts against the electrode assembly 30, and weld the circumferential joint between the cover body 102 and the housing body 101, thereby completing the assembly of the electrode assembly 30 and the interception member 40 to the housing 10. When the interception member 40 is provided with the first protrusion 43, the first protrusion 43 occupies the second space, resulting in the process of the flue gas flowing towards the pressure relief structure 20 in the second space being blocked by the first protrusion 43. However, since the interception member 40 of this embodiment does not have the first protrusion 43, the second space is unobstructed. Therefore, there is no first protrusion 43 in the second space to block the flue gas from flowing towards the pressure relief structure 20, and the flue gas can flow smoothly towards the pressure relief structure 20.

[0111] In some embodiments of the present application, the cross-sectional shape of the housing 10 perpendicular to the arrangement direction of the two end walls 12 is square, that is, the battery cell 100 of the present application is a square battery cell. As Figure 4-1 and Figure 4-2 shown, a plurality of second protrusions 111 are correspondingly provided at the corner positions of the circumferential side wall 11. That is to say, second protrusions 111 are provided at the four corner positions of the circumferential side wall 11, and the number of the second protrusions 111 is four. Correspondingly, the shape of the interception member 40 is square, and the interception member 40 is placed into the accommodation space 13 until the four corner positions of the interception member 40 respectively abut against the four second protrusions 111.

[0112] As Figures 1 to 3As shown, in some embodiments of the present application, the battery cell 100 is a square battery cell, and one side of each second protrusion 111 facing the accommodation space 13 is an arc surface 112 recessed in a direction away from the accommodation space 13. Since the electrode assembly 30 is formed by winding after laminating a positive electrode sheet, an insulating separator, and a negative electrode sheet, the cross-section of the electrode assembly 30 is close to square, and the area of the electrode assembly 30 corresponding to the corner position of the circumferential side wall 11 is a transition rounded corner 32. And, the pressure relief structure 20 is installed on the cover body 102. Therefore, when the electrode assembly 30 is placed into the accommodation space 13, the arc surface 112 on each second protrusion 111 can smoothly avoid the electrode assembly 30, enabling the electrode assembly 30 to fully utilize the accommodation space 13, thereby improving the energy density of the battery cell 100.

[0113] As Figures 1 to 3 shown, the electrode assembly 30 is provided with a tab 31. As Figure 1 、 Figures 12 to 14 shown, in some embodiments of the present application, the interception member 40 is provided with an assembly hole 44 for the tab 31 to pass through. In this way, the tab 31 can smoothly pass through the assembly hole 44, and the tab 31 and the interception member 40 are insulated, that is, the interception member 40 and the electrode assembly 30 are insulated. This enables the tab 31 to smoothly avoid the interception member 40 to complete electrical connection with the electrode post structure 15 installed on the end wall 12, improving the assembly efficiency.

[0114] In some embodiments of the present application, the interception member 40 may but is not limited to include a first sub-interception member 401 and a second sub-interception member 402. The first sub-interception member 401 is provided with a first mating structure, and the second sub-interception member 402 is provided with a second mating structure, and the first mating structure and the second mating structure are adaptively connected. As Figure 13 shown in the example of the interception member 40, the interception member 40 is formed by splicing three splicing sub-blocks, namely one second sub-interception member 402 and two first sub-interception members 401. In the interception member 40 of this embodiment, the docking edge of the first sub-interception member 401 is provided with a first clamping structure 404, and the docking edge of the second sub-interception member 402 is provided with a second clamping structure 405 adapted to the first clamping structure 404, and they are spliced and formed by clamping the first clamping structure 404 and the second clamping structure 405. In this embodiment, the first mating structure is the first clamping structure 404, and the second mating structure is the second clamping structure 405. As Figure 13 shown, between the first sub-interception member 401 and the second sub-interception member 402, when the first sub-interception member 401 and the second sub-interception member 402 are spliced with each other, the first clamping structure 404 and the second clamping structure 405 are clamped with each other, thereby splicing and fixing the first sub-interception member 401 and the second sub-interception member 402.

[0115] In some embodiments of the present application, such as Figure 14 As shown in the example, the interception component 40 is formed by splicing two pieces, namely the first sub-interception component 401 and the second sub-interception component 402. The docking edge of the first sub-interception component 401 is set as the first engaging edge 406, and the docking edge of the second sub-interception component 402 is set as the second engaging edge 407 adapted to the first engaging edge 406. The first engaging edge 406 and the second engaging edge 407 are engaged with each other to form a splicing shape.

[0116] It should be noted that in the present application, the interception component 40 can be formed by splicing multiple first sub-interception components 401 and multiple second sub-interception components 402, and the first sub-interception components 401 and the second sub-interception components 402 are alternately distributed in sequence. Between adjacent first sub-interception components 401 and second sub-interception components 402, whether it is realized by mutual clamping of the first clamping structure 404 and the second clamping structure 405 or by mutual engagement of the first engaging edge 406 and the second engaging edge 407, it can make the adjacent first sub-interception components 401 and second sub-interception components 402 have a certain degree of structural strength, so as to be able to withstand the action of high-pressure flue gas when the battery cell 100 undergoes thermal runaway, be able to keep the overall shape of the interception component 40 almost unchanged, and will not occur the situation of the overall structural collapse of the interception component 40, ensuring that the pole piece fragments can be effectively intercepted by the interception component 40, which helps to improve the safety performance of the battery cell 100.

[0117] In some embodiments of the present application, the interception component 40 is a ceramic component. In this embodiment, the interception component 40 made of ceramic material has the characteristics of good heat resistance and good insulation. In this way, when the interception component 40 is assembled to the housing 10, insulation can be always maintained between the interception component 40 and the electrode assembly 30, between the interception component 40 and the housing 10, and between the interception component 40 and the pressure relief structure 20, preventing the occurrence of a short - circuit accident inside the battery cell 100 due to the addition of the interception component 40, and ensuring that the battery cell 100 can always be charged and discharged normally. Moreover, when the battery cell 100 undergoes thermal runaway, the accommodation space 13 is in a high - temperature state, and the ceramic - material interception component 40 can withstand high temperatures. Even when the environmental temperature where the interception component 40 is located is greater than or equal to 500 °C, the interception component 40 will not collapse structurally due to the influence of the high - temperature environment, ensuring that the electrode piece fragments can be effectively intercepted by the interception component 40, which helps to improve the safety performance of the battery cell 100. The structural collapse of the interception component 40 includes but is not limited to: the through - hole 41 on the interception component 40 is damaged structurally due to the influence of high temperature, resulting in the electrode piece fragments being able to pass through the interception component 40 and reach the pressure relief structure 20, and then the electrode piece fragments are ejected from the pressure relief structure 20 to ignite the flue gas, or the electrode piece fragments accumulate at the pressure relief structure 20, causing the pressure relief structure 20 to be blocked by the electrode piece fragments, ultimately leading to the explosion of the battery cell 100.

[0118] As Figure 7-1 and Figure 7-2 shown, in some other embodiments of the present application, the interception component 40 includes a metal plate member 408 and an insulating layer 409. The insulating layer 409 is disposed on the metal plate member 408, and the hole wall of the through - hole 41 is covered by the insulating layer 409, so as to ensure the insulation performance between the entire exterior of the interception component 40 and the electrode assembly 30. Moreover, the melting point of the metal plate member 408 is greater than the melting point of the insulating layer 409. In this embodiment, the insulating layer 409 includes but is not limited to insulating plastic or insulating rubber, and the insulating layer 409 can ensure that it will not melt and expose the metal plate member 408 when the environmental temperature is less than or equal to 100 °C, ensuring the insulation performance of the entire interception component 40. Furthermore, the metal plate member 408 can effectively improve the overall structural strength of the interception component 40. Even when the battery cell 100 undergoes thermal runaway, the interception component 40 will not collapse structurally due to the influence of the high - temperature environment, ensuring that the electrode piece fragments can be effectively intercepted by the interception component 40, which helps to improve the safety performance of the battery cell 100.

[0119] According to the second aspect of the present application, a battery 200 is provided. As Figure 15 shown, the battery 200 includes the battery cell 100 as described above. As Figure 15As shown, the battery 200 includes a case 210 and a plurality of battery cells 100. The case 210 forms an assembly space 213. Among them, the case 210 includes a case body 211 and a case cover 212. The case cover 212 covers the opening of the case body 211 to form a sealed assembly space 213. The battery cells 100 are installed in the assembly space 213.

[0120] According to the third aspect of the present application, an electrical device 300 is provided. Among them, the electrical device 300 includes the battery 200 as described above, uses the battery 200 for charging and energy storage, and uses the battery 200 for discharging to provide electrical energy for the electrical load of the electrical device 300.

[0121] The electrical device 300 includes, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include, but are not limited to, stationary or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include, but is not limited to, airplanes, rockets, space shuttles, and spaceships, etc.

[0122] In the embodiment of the present application, the electrical device 300 is an electric vehicle, as Figure 16 shown, the battery 200 is installed on the frame 301 of the electric vehicle. Using the battery 200 provided by the design of the embodiment of the present application to supply power to the drive motor 302 of the electric vehicle (i.e., the electrical load of the electrical device 300), the drive motor 302 drives the wheels 303 to rotate, so that the electric vehicle can run normally.

[0123] The above are only optional embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A battery cell, characterized in that, Comprising: A housing; A pressure relief structure, mounted on the housing; An electrode assembly, disposed within the housing; An insulating member, disposed within the housing and located between the housing and the electrode assembly; An interception member, disposed within the housing and located between the pressure relief structure and the electrode assembly, the interception member being insulated from the housing, and a through hole being provided at a position of the interception member opposite to the pressure relief structure, and moreover, the melting point of the interception member is higher than the melting point of the insulating member.

2. The battery cell according to claim 1, wherein, The interception member is provided with a plurality of the through holes, and the plurality of through holes are evenly distributed.

3. The battery cell according to claim 2, wherein, The apertures of the plurality of through holes are equal; or The apertures of a part of the through holes disposed opposite to the pressure relief structure are smaller than the apertures of the remaining through holes.

4. The battery cell according to claim 1, wherein, The interception member is provided with a plurality of the through holes, and the distribution density of a part 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 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, along the arrangement direction of the two end walls, the total projected area of all the through holes is S1, and the projected area of the exhaust passage of the pressure relief structure is S2, and S1≥S2.

6. The battery cell according to claim 5, wherein, A reinforcing rib is provided on a surface of the interception member facing the electrode assembly.

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

8. The battery cell according to claim 6, wherein, At least one through hole is provided in the reinforcing rib.

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

10. The battery cell according to claim 9, wherein, A first protrusion is provided on a surface of the interception member 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 mounted.

11. The battery cell according to claim 10, wherein, The total contact area of all the first protrusions with the end wall is S5, and S5≥0.1*S3.

12. The battery cell according to claim 10, wherein, The interception member, the reinforcing rib and the first protrusion are integrally formed.

13. The battery cell according to any one of claims 1-4, wherein, The interception member and the pressure relief structure are spaced apart, and the size of the interval between the surface of the interception member facing the pressure relief structure and the pressure relief structure is greater than or equal to 1 mm.

14. The battery cell according to claim 5, wherein, A second protrusion for supporting the interception member is provided on the inner wall of the circumferential side wall.

15. The battery cell according to claim 14, wherein, one of the end walls covers the circumferential side wall to form an accommodation space, and a third protrusion is provided on a side facing the interception member, and the interception member is clamped between the second protrusion and the third protrusion.

16. The battery cell according to claim 15, wherein, both the third protrusion and the second protrusion are multiple, and the multiple third protrusions are arranged in one-to-one correspondence with the multiple second protrusions.

17. The battery cell according to claim 15, wherein, the cross-sectional shape of the housing perpendicular to the arrangement direction of the two end walls is square, and the multiple second protrusions are arranged in one-to-one correspondence at the corner positions of the circumferential side wall.

18. The battery cell according to claim 17, wherein, one side of each of the second protrusions facing the accommodation space is provided with an arc surface recessed in a direction away from the accommodation space.

19. The battery cell according to any one of claims 1-4, wherein, the electrode assembly is provided with a tab, and the interception member is provided with an assembly hole for the tab to pass through.

20. The battery cell according to any one of claims 1-4, wherein, the interception member includes a first sub-interception member and a second sub-interception member, the first sub-interception member is provided with a first mating structure, the second sub-interception member is provided with a second mating structure, and the first mating structure and the second mating structure are adapted and connected.

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

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

23. The battery cell according to any one of claims 1-4, wherein, the interception member is a ceramic part.

24. The battery cell according to any one of claims 1-4, wherein, the interception member includes a metal plate member and an insulating layer, the insulating layer is arranged on the metal plate member, the insulating layer is used to insulate the metal plate from the electrode assembly, and the melting point of the metal plate is greater than the melting point of the insulating layer.

25. A battery, wherein, The battery includes the battery cell according to any one of claims 1-24.

26. An electrical device, wherein, The electrical equipment includes the battery according to claim 25.

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