Battery monomer, battery and electric device

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery, a battery and a power utilization device, the single battery comprises a shell, an end cover, an electrode assembly and an insulation protection piece, the shell is provided with an opening, the end cover covers the opening, a pressure relief structure is arranged on the end cover, the electrode assembly is arranged in the shell, and the insulation protection piece is arranged on the side, facing the electrode assembly, of the end cover; the insulation protection piece is provided with an exhaust structure corresponding to the pressure relief structure in position, the exhaust structure comprises a plurality of supporting ribs, the supporting ribs are sequentially arranged at intervals in the first direction, exhaust channels are formed between the adjacent supporting ribs, the size of each exhaust channel is L1 in the first direction, and the size of each supporting rib is L2 in the first direction. The size L1 of the exhaust channel is larger than or equal to the size L2 of the supporting rib adjacent to the exhaust channel, and the first direction intersects with the direction, facing the electrode assembly, of the end cover. The possibility that the pressure relief structure cannot be opened in time due to the fact that the exhaust passage is blocked by melting of the exhaust structure is reduced, and the opening timeliness of the pressure relief structure is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] This section merely provides background information related to the present application and is not necessarily prior art.

[0003] Batteries can store electrical energy and can be widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and electric tools.

[0004] Thermal runaway is prone to occur when the battery has external short circuit, overcharge, needle puncture, plate impact, etc. During thermal runaway, the internal pressure of the battery will increase. The timely release of the internal pressure of the battery is more important for the prevention and control of thermal runaway. Utility Model Content

[0005] In view of the above problems, the present application provides a battery cell, a battery and an electrical device to reduce the impact of the insulating protection part on the pressure relief structure, improve the timeliness of opening the pressure relief structure during thermal runaway, and reduce the risk caused by thermal runaway of the battery cell.

[0006] The first aspect of the present application proposes a battery cell, including a shell, an end cover, an electrode assembly and an insulating protective member, the shell having an opening, the end cover covering the opening, a pressure relief structure being arranged on the end cover, the electrode assembly being arranged in the shell, the insulating protective member being arranged on a side of the end cover facing the electrode assembly, the insulating protective member having an exhaust structure corresponding to the position of the pressure relief structure, the exhaust structure comprising a plurality of support ribs, the plurality of support ribs being arranged in sequence and spaced apart along a first direction, an exhaust duct being formed between adjacent support ribs, along the first direction, a size of the exhaust duct being L1 and a size of the support rib being L2, the size L1 of the exhaust duct being greater than or equal to a size L2 of the support rib adjacent to the exhaust duct, and the first direction intersects with a direction of the end cover toward the electrode assembly.

[0007] In the technical solution of the embodiment of the present application, the size L1 of the exhaust duct is greater than or equal to the size L2 of its adjacent support rib. The size of the exhaust duct is relatively large. When a battery cell has a thermal runaway, the smoke and other emissions generated in the battery cell can impact the pressure relief structure relatively smoothly through the exhaust duct, thereby improving the timeliness of the opening of the pressure relief structure. Moreover, when the battery has a thermal runaway and causes the exhaust structure to melt at a high temperature, since the size L1 of the exhaust duct is greater than or equal to the size L2 of its adjacent support rib, the molten support rib is not easy to contact the adjacent support ribs, and the melted support rib can fall off in time, thereby reducing the possibility that the exhaust structure melts and blocks the exhaust duct, resulting in the inability of smoke and other emissions to flow to the pressure relief structure in time, causing the pressure relief structure to fail to open in time. This improves the timeliness of the opening of the pressure relief structure and reduces the risk of thermal runaway of the battery cell.

[0008] In some embodiments of the present application, the size L1 of the exhaust duct is 1 to 1.5 times the size L2 of the support rib adjacent to the exhaust duct. The size limits of the exhaust duct and the support rib in this embodiment can take into account the strength and flow area of ​​the exhaust structure. When the battery cell does not have thermal runaway, the exhaust structure has good support strength, and the support rib can abut against the electrode assembly to provide a strong support for the electrode assembly, reducing the possibility of the electrode assembly shaking in the shell. When the battery cell has thermal runaway, the smoke and other emissions generated in the battery cell can impact the pressure relief structure more smoothly through the exhaust duct, and the support rib can fall off in time after melting, reducing the possibility of the exhaust structure melting and blocking the exhaust duct.

[0009] In some embodiments of the present application, the size L1 of the exhaust duct is 1.2 to 1.5 times the size L2 of the support rib adjacent to the exhaust duct. The size L1 of the exhaust duct is greater than or equal to 1.2 times the size L2 of the support rib, which can better balance the strength of the exhaust structure and make it easier for the support rib to fall off in time after melting, thereby reducing the possibility of the exhaust structure melting and blocking the exhaust duct.

[0010] In some embodiments of the present application, the size L2 of the support ribs ranges from 0.4 mm to 3.0 mm, and / or the size L1 of the exhaust duct ranges from 0.5 mm to 3 mm. The size limitation of the support ribs and / or the exhaust duct in this embodiment can make the exhaust structure have better strength, and at the same time can retain less solid material, which is conducive to reducing costs. Moreover, since the support ribs are thinner, the support ribs can be melted and dropped faster when melted, which reduces the possibility of the exhaust structure melting and blocking the exhaust duct.

[0011] In some embodiments of the present application, the size L2 of the support ribs ranges from 0.8 mm to 1.5 mm, and / or the size L1 of the exhaust duct ranges from 0.8 mm to 1.8 mm. The size limitation of the support ribs and / or the exhaust ducts in this embodiment can better balance the strength of the exhaust structure and the timeliness of the melting and falling of the support ribs.

[0012] In some embodiments of the present application, along the direction from the end cap toward the electrode assembly, the size of the support rib is H1, and the size L2 of the support rib is greater than the size H1 of the support rib. In this embodiment, the thickness of the support rib is set to be smaller than the width of the support rib, which can facilitate the processing of the support rib. For example, the support rib can be an injection-molded plastic part. Since the width of the support rib is greater than the thickness, it is easier to form; at the same time, while maintaining the strength of the support rib, the cross-sectional area of ​​the support rib can be reduced, which is conducive to increasing the speed of the support rib melting and falling, and reducing the possibility of the support rib contacting other support ribs due to melting, thereby blocking the exhaust duct.

[0013] In some embodiments of the present application, the size L2 of the support rib is 1.5 to 3 times the size H1 of the support rib. The setting of the thickness and width of the support rib in this embodiment can take into account the strength and melting drop speed of the support rib, and the support rib is easier to form, which is conducive to improving the processing efficiency and processing rationality of the insulation protection part.

[0014] In some embodiments of the present application, the size H1 of the support ribs ranges from 0.2 mm to 1.5 mm. The limitation of the size H1 of the support ribs in this embodiment can further take into account the strength and melting drop speed of the support ribs, and the support ribs are easier to form.

[0015] In some embodiments of the present application, the size H1 of the support rib ranges from 0.5 mm to 1 mm.

[0016] In some embodiments of the present application, the insulating protection member further includes a body, the body is provided with an exhaust port, the pressure relief structure and the exhaust structure are arranged relative to each other through the exhaust port and are respectively located on opposite sides of the body. The pressure relief structure and the exhaust structure are respectively arranged on both sides of the body, so that the exhaust structure and the pressure relief structure are arranged at intervals, so that the flue gas and other emissions in the battery cell can flow to the pressure relief structure more smoothly after passing through the exhaust structure, and when the support ribs of the exhaust structure are melted, the molten material is not easy to contact or block the pressure relief structure, which reduces the possibility of the exhaust structure melting and blocking the pressure relief structure, improves the timeliness of the opening of the pressure relief structure, and reduces the risk of thermal runaway of the battery cell.

[0017] In some embodiments of the present application, the exhaust structure further includes a support wall, one end of the support wall is connected to the body, the support rib is connected to the other end of the support wall, and the support wall is provided with a connecting port connected to the exhaust port. The support rib is connected to the body through the support wall, which can increase the interval between the support rib and the body, and reduce the possibility of the support rib contacting with the pressure relief structure and blocking the pressure relief structure when the support rib melts; the provision of the support wall is conducive to the support rib abutting and supporting the electrode assembly without increasing the thickness of the support rib, thereby improving the stability of the electrode assembly in the shell. The support wall is provided with a connecting port, which can increase the flow area of ​​the exhaust structure, which is conducive to the timely flow of emissions such as smoke to the pressure relief structure through the exhaust structure.

[0018] In some embodiments of the present application, the support wall includes a first side wall and a second side wall that are arranged opposite to each other, the two ends of the support rib along the second direction are connected to the first side wall and the second side wall respectively, the first side wall and / or the second side wall are provided with the connecting port corresponding to the position of the exhaust duct, the connecting port is connected to the corresponding exhaust duct, the second direction intersects with the first direction, and intersects with the direction of the end cover toward the electrode assembly. The connecting port is connected to the exhaust duct, which is more conducive to the passage of emissions, thereby facilitating the timely flow of emissions such as flue gas to the pressure relief structure through the exhaust structure.

[0019] In some embodiments of the present application, the exhaust duct includes a first exhaust duct and a second exhaust duct, the first exhaust duct and the second exhaust duct are alternately arranged along the first direction, the first side wall is provided with the connecting port corresponding to the position of the first exhaust duct, and the second side wall is provided with the connecting port corresponding to the position of the second exhaust duct. Since the first exhaust duct and the second exhaust duct are alternately arranged along the first direction, the first side wall is provided with a connecting port corresponding to the first exhaust duct, and the second side wall is provided with a connecting port corresponding to the second exhaust duct, thus, along the first direction, the first side wall is provided with connecting ports alternately corresponding to the multiple exhaust ducts, and the second side wall is provided with connecting ports alternately corresponding to the multiple exhaust ducts, and the connecting ports of the second side wall and the connecting ports of the first side wall are alternately arranged along the first direction. This alternating arrangement of the connecting ports on the first side wall and the second side wall can reduce the strength influence of the connecting ports on the first side wall and the second side wall while increasing the flow area of ​​the discharge structure, which is conducive to maintaining the strength of the discharge structure.

[0020] In some embodiments of the present application, along the direction from the end cap toward the electrode assembly, the size of the communication port is D1, the size of the support wall is D2, and D1 is less than or equal to 1 / 2 times D2. The limitation on the size of the communication port in this embodiment can take into account both the flow area of ​​the communication port and the strength of the support wall.

[0021] In some embodiments of the present application, along the direction from the end cap toward the electrode assembly, the size of the support rib is H1, and the size D1 of the communication port is greater than or equal to the size H1 of the support rib. The limitation on the size of the communication port in this embodiment can better take into account the flow area of ​​the communication port and the strength of the support wall.

[0022] In some embodiments of the present application, the sum of the flow areas of all the exhaust passages and the flow areas of all the connecting ports is greater than the pressure relief area of ​​the pressure relief structure. The sum of the flow areas of all the exhaust passages and the flow areas of all the connecting ports is greater than the pressure relief area of ​​the pressure relief structure, which means that the flow area of ​​the inlet of the exhaust structure is greater than the area of ​​the pressure relief structure. In this way, when thermal runaway occurs in the battery cell, the emissions in the battery cell can flow to the pressure relief structure through the exhaust structure more smoothly, reducing the flow limiting effect of the exhaust structure on the emissions, which is conducive to the smooth opening of the pressure relief structure.

[0023] In some embodiments of the present application, the sum of the flow areas of all the exhaust passages and the flow areas of all the connecting ports is greater than or equal to 1.2 times the pressure relief area of ​​the pressure relief structure. The limitation of the flow area of ​​the exhaust structure in this embodiment can take into account both the strength and flow area of ​​the exhaust structure, which is conducive to the smooth flow of emissions through the exhaust structure to the pressure relief structure.

[0024] In some embodiments of the present application, along the direction from the end cap toward the electrode assembly, the size of the support rib is H1, and the thickness W1 of the support wall is 0.8 to 1.5 times the size H1 of the support rib. The thickness limit of the support wall in this embodiment can take into account the strength of the support wall, and is conducive to reducing the physical structure of the insulating protection part, which is conducive to the rapid melting and falling of the exhaust structure during thermal runaway.

[0025] In some embodiments of the present application, the thickness W1 of the support wall is 1 to 1.2 times the size H1 of the support rib. The thickness limit of the support wall in this embodiment can better take into account the strength of the support wall, and is conducive to reducing the physical structure of the insulating protection part, which is conducive to the rapid melting and falling of the exhaust structure during thermal runaway.

[0026] In some embodiments of the present application, the thickness W1 of the support wall ranges from 0.2 mm to 2.2 mm. The thickness limit of the support wall in this embodiment can better take into account the strength of the support wall, and the thin support wall is conducive to the rapid melting and falling of the exhaust structure during thermal runaway.

[0027] In some embodiments of the present application, the thickness W1 of the support wall is in the range of 0.6 mm to 1 mm. The thickness of the support wall in this embodiment is limited to further take into account the strength of the support wall and the convenience of high temperature melting.

[0028] In some embodiments of the present application, the main body and the exhaust structure are an integral structure.

[0029] In some embodiments of the present application, the insulating protection component is a plastic component.

[0030] In some embodiments of the present application, the support rib abuts against the electrode assembly.

[0031] A second aspect of the present application provides a battery, comprising the battery cell provided in the present application or any embodiment of the present application.

[0032] A third aspect of the present application proposes an electrical device, comprising a battery proposed in the present application or any embodiment of the present application, wherein the battery is used to provide electrical energy.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0035] Figure 1 The structure diagram of the vehicle of some embodiments of the present application is schematically shown;

[0036] Figure 2 Schematically shows an exploded view of a battery provided in some embodiments of the present application;

[0037] Figure 3 Schematically shows a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0038] Figure 4 The schematic diagram of assembling the end cap and the insulating protection member of some embodiments of the present application is schematically shown;

[0039] Figure 5 Schematically showing the split diagram of the end cover and the insulating protection member of some embodiments of the present application;

[0040] Figure 6 Schematically shows Figure 5 A magnified view of part A;

[0041] Figure 7 Schematic diagrams of insulating protection members according to some embodiments of the present application are schematically shown;

[0042] Figure 8 It is the BB cross-sectional view of FIG.

[0043] The reference numerals in the specific implementation manner are as follows:

[0044] 1000. Vehicles;

[0045] 100, battery; 10, housing; 11, first part; 12, second part; 20, battery cell; 21, end cover; 211, electrode terminal; 212, pressure relief structure; 213, pressure relief area; 22, housing; 23, electrode assembly; 231, pole ear; 232, main body; 24, connecting sheet; 25, insulating sheet;

[0046] 30. Insulation protection member; 31. Main body; 311. Exhaust port; 32. Exhaust structure; 322. Support wall; 3221. First side wall; 3222. Second side wall; 323. Communication port; 324. Exhaust duct; 3241. First exhaust duct; 3242. Second exhaust duct; 325. Support rib; 33. Protrusion; 34. Protrusion structure;

[0047] 200, controller;

[0048] 300, motor;

[0049] X, first direction; Y, second direction; Z, height direction. DETAILED DESCRIPTION

[0050] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0052] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0053] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0055] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0056] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0058] With the vigorous development of the new energy industry, the capacity of large-capacity battery cells is increasing, and the performance requirements for batteries are also getting higher and higher. Batteries usually include one or more battery cells. When the battery has external short circuits, overcharging, needle punctures, plate impacts, etc., it is easy to cause thermal runaway. After the battery thermal runaway, high-temperature substances such as high-temperature smoke will be generated in the battery cell, which will increase the pressure in the battery cell. If the battery cell cannot be depressurized in time, the risk of thermal runaway will increase, and even cause an explosion.

[0059] In some technologies, a pressure relief structure is provided on the end cap of the battery cell so that when the battery cell experiences thermal runaway, high-temperature smoke and other emissions can be released in time to relieve the pressure of the battery cell. In the relevant tests of the battery cell, it was found that when the battery cell experiences thermal runaway, there is a risk that the pressure relief structure on the end cap cannot be opened in time to relieve the pressure of the battery cell.

[0060] Further research found that an insulating protective part is arranged between the end cover and the electrode assembly of the battery cell. Emissions such as high-temperature flue gas need to flow through the insulating protective part before flowing to the pressure relief structure. When the battery has thermal runaway, the insulating protective part arranged between the end cover and the electrode assembly of the battery cell is easily melted by high temperature, thereby blocking the vents corresponding to the insulating protective part and the pressure relief structure, resulting in the inability of emissions to flow to the pressure relief structure in time, so that the battery cell cannot be depressurized in time.

[0061] Based on the above research, in order to alleviate the impact of the insulating protection part on the pressure relief structure and improve the timeliness of opening the pressure relief structure, the present application provides a battery cell, the insulating protection part of the battery cell has an exhaust structure corresponding to the position of the pressure relief structure, the exhaust structure includes a plurality of support ribs, and the plurality of support ribs are arranged in sequence along a first direction. Exhaust ducts are formed between adjacent support ribs, and the width of the support ribs is less than or equal to the width of the adjacent exhaust ducts.

[0062] The width of the exhaust duct is relatively large. When a battery cell experiences thermal runaway, the flue gas and other emissions generated in the battery cell can impact the pressure relief structure relatively smoothly through the exhaust duct, which improves the timeliness of the pressure relief structure opening. In addition, when the battery experiences thermal runaway and causes the exhaust structure to melt at high temperature, since the width of the exhaust duct is greater than the width of its adjacent support ribs, the melted support ribs are not easy to contact the adjacent support ribs, and the melted support ribs can fall off in time, reducing the possibility that the exhaust structure melts and blocks the exhaust duct, resulting in the inability of flue gas and other emissions to flow to the pressure relief structure in time, causing the pressure relief structure to be unable to open in time, improving the timeliness of the pressure relief structure opening, and reducing the risk of thermal runaway of the battery cell.

[0063] The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is conducive to alleviating and automatically adjusting the deterioration of the expansion force of the battery cell, replenishing the consumption of the electrolyte, and improving the stability of the battery performance and the battery life.

[0064] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0065] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0066] Please refer to Figure 1 , Figure 1 The structural diagram of the vehicle provided by some embodiments of the present application is schematically shown. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is arranged inside the vehicle 1000, and the battery 100 can be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.

[0067] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0068] Please refer to Figure 2 , Figure 2The exploded diagram of the battery provided in some embodiments of the present application is schematically shown. The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is contained in the box body 10. Among them, the box body 10 is used to provide a storage space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0069] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0070] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0071] Please refer to Figure 3 , Figure 3 The schematic diagram of the decomposition structure of the battery cell provided in some embodiments of the present application is schematically shown. The battery cell 20 refers to the smallest unit that constitutes the battery. Figure 3 As shown, the battery cell 20 includes an end cover 21, an insulating protection member 30, a housing 22, an electrode assembly 23 and other functional components.

[0072] The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and improved safety performance. Functional components such as electrode terminals 211 can be provided on the end cap 21. The electrode terminal 211 can be used to electrically connect to the electrode assembly 23 through the connecting piece 24 to output or input electrical energy of the battery cell 20. In some embodiments, the end cap 21 may also be provided with a pressure relief structure 212 for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The pressure relief structure 212 may be in the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and may be a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold value, the pressure relief structure 212 performs an action or a weak structure provided in the pressure relief structure 212 is destroyed, thereby forming an opening or channel for releasing the internal pressure of the battery cell 20. The material of the end cap 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0073] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 22 and the end cap 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 21 at the opening. Without limitation, the end cap 21 and the shell 22 can also be integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the end cap 21 covers the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. An insulating sheet 25 may be further disposed in the shell 22 . The insulating sheet 25 may be wrapped around the outer side of the electrode assembly 23 to isolate the electrode assembly 23 from the shell 22 .

[0074] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The electrode assembly 23 includes a main body 232 and a tab 231, wherein the main body 232 mainly includes the portion of the positive electrode sheet and the negative electrode sheet with active materials, and the portion of the positive electrode sheet and the negative electrode sheet without active materials each constitutes a tab 231. The positive tab and the negative tab may be located together at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 231 may be connected to the electrode terminal 211 through the connecting sheet 24 to form a current loop.

[0075] The insulating protective member 30 is a component located between the end cap 21 and the electrode assembly 23. The insulating protective member 30 can be a plastic member. The insulating protective member can be prefabricated from plastic or assembled from various plastic parts, and the material is an insulating material. The insulating protective member can also be a member of other materials, such as a rubber member. The insulating protective member 30 has two main functions. One is that it can be used to isolate the electrical connection components in the shell 22 from the end cap 21 to reduce the risk of short circuit. The second is to effectively support the end face of the electrode assembly 23. After the electrode assembly 23 is assembled into the shell and the end cap 21 is welded, the internal winding core of the electrode assembly 23 is in a state of slight pressure, and the electrode assembly 23 will also be in a vibrating environment during loading and use. If the electrode assembly 23 is not restrained enough, it will easily affect the life of the winding core or cause a short circuit. Therefore, the insulating protective member needs to effectively support the end face of the winding core to reduce the possibility of the electrode assembly 23 moving up and down.

[0076] According to some embodiments of the present application, reference Figure 3 , and further combined with Figures 4 to 6 As shown, Figure 4 The following schematically shows the assembly diagram of the end cap and the insulating protection member of some embodiments of the present application. Figure 5 The split diagram of the end cover and the insulating protection member of some embodiments of the present application is schematically shown. Figure 6 Schematically shows Figure 5The enlarged view of the A part of the embodiment provides a battery 100 monomer, including a shell 22, an end cover 21, an electrode assembly 23 and an insulating protection member 30, the shell 22 has an opening, the end cover 21 covers the opening, the end cover 21 is provided with a pressure relief structure 212, the electrode assembly 23 is arranged in the shell 22, the insulating protection member 30 is arranged on the side of the end cover 21 facing the electrode assembly 23, the insulating protection member 30 has an exhaust structure 32 corresponding to the position of the exhaust structure 212, and the exhaust structure 32 includes multiple Support ribs 325, multiple support ribs 325 are arranged in sequence along the first direction X, and exhaust channels 324 are formed between adjacent support ribs 325. Along the first direction X, the size of the exhaust channel 324 is L1, the size of the exhaust channel 324 is L1 and the size of the support rib 325 is L2, the size L1 of the exhaust channel 324 is greater than or equal to the size L2 of the support rib 325 adjacent to the exhaust channel 324, and the first direction X intersects with the direction of the end cover 21 toward the electrode assembly 23.

[0077] The insulating protection member 30 can be fixed on the end cap 21 and is located on the side of the end cap 21 close to the electrode assembly 23. The side of the end cap 21 close to the electrode assembly 23 is the inner side of the end cap 21. Figure 3 As shown in the figure, when the end cover 21 is placed on top and the housing 22 is placed in the forward direction, it is also the lower side of the end cover 21. For the convenience of description, the corresponding components are described in the state where the battery 100 is placed in the forward direction.

[0078] The exhaust structure 32 is a part of the insulating protective part 30. The position correspondence between the exhaust structure 32 and the pressure relief structure 212 can be understood as that the exhaust structure 32 and the pressure relief structure 212 are arranged relative to each other. Specifically, the exhaust structure 32 can be located directly below the pressure relief structure 212, along the direction of the end cover 21 toward the electrode assembly 23 (which can be understood by referring to the height direction Z of the battery 100 cell), and the positive projection of the pressure relief structure 212 onto the insulating protective part 30 can be located inside the exhaust structure 32.

[0079] The exhaust duct 324 of the exhaust structure 32 can allow the high-temperature flue gas generated in the battery 100 to flow to the pressure relief structure 212. The exhaust duct 324 can be a structure that passes through the top and bottom surfaces of the insulating protection member 30, wherein the top surface of the insulating protection member 30 is the side facing the end cover 21, and the bottom surface of the insulating protection member 30 is the side facing away from the end cover 21.

[0080] Both ends of the support rib 325 can be connected to the main body of the insulating protection member 30. The bottom surface of the support rib 325 can abut against the electrode assembly 23 to support and fix the electrode assembly 23. The support rib 325 can be made of the same material as the insulating protection member 30, and specifically can be both plastic parts. Multiple support ribs 325 can be arranged at equal intervals or at unequal intervals. The dimension L1 of the exhaust duct 324 along the first direction X can be understood as the width of the exhaust duct 324, which is the spacing between the support ribs 325 on opposite sides of the exhaust duct 324. The dimension L2 of the support rib 325 along the first direction X can be understood as the width of the support rib 325, which is the spacing between the two opposite side surfaces of the support rib 325 along the first direction X.

[0081] It should be noted that when the same exhaust duct 324 has different widths at different positions, for example, when multiple support ribs 325 are arranged non-parallel, the dimension L1 of the exhaust duct 324 along the first direction X can be the minimum width of the exhaust duct 324. In this embodiment, multiple support ribs 325 can be arranged roughly in parallel, and the width of the same exhaust duct 324 at any position is roughly the same. The support rib 325 has different widths at different positions. For example, when the support rib 325 is a non-uniform diameter rib, the dimension L2 of the support rib 325 along the first direction X can be the maximum width of the support rib 325. In this embodiment, the width of the support rib 325 along the length direction is roughly the same, and the support rib 325 can be a rib with a square cross section (a cross section perpendicular to the length direction of the support rib 325).

[0082] The size L1 of the exhaust channel 324 is greater than or equal to the size L2 of the support rib 325 adjacent to the exhaust channel 324. It can be understood that along the first direction X, the width of each support rib 325 located on both sides of the exhaust channel 324 is less than or equal to the width of the exhaust channel 324, or in other words, the width of each of the two adjacent support ribs 325 is less than or equal to the width of the exhaust channel 324 between the two. In some embodiments, the plurality of support ribs 325 are arranged at approximately equal intervals along the first direction X, and the widths of the plurality of support ribs 325 may be substantially the same.

[0083] The direction of the end cap 21 toward the electrode assembly 23 can be understood with reference to the height direction Z of the battery 100. The first direction X can be substantially perpendicular to the height direction Z of the battery 100. Specifically, the first direction X is the width direction of the battery 100, or the thickness direction of the battery 100. It should be noted that this embodiment is described by taking the first direction X as the thickness direction of the battery 100 as an example. Figures 4 to 6 The first direction X in the diagram is consistent with the thickness direction of the battery 100, and the second direction Y is consistent with the width direction of the battery 100.

[0084] In the battery 100 monomer of this embodiment, the size L1 of the exhaust channel 324 is greater than or equal to the size L2 of the adjacent support rib 325. The size of the exhaust channel 324 is relatively large. When the battery 100 monomer has thermal runaway, the flue gas and other emissions generated in the battery 100 monomer can impact the pressure relief structure 212 relatively smoothly through the exhaust channel 324, thereby improving the timeliness of the opening of the pressure relief structure 212. In addition, when the battery 100 has thermal runaway and the exhaust structure 32 melts at high temperature, since the size L1 of the exhaust channel 324 is greater than or equal to the size L2 of the adjacent support rib 325, the melted support rib 325 is not easy to contact the adjacent support rib 325, and the melted support rib 325 can fall in time, thereby reducing the possibility that the exhaust structure 32 melts and blocks the exhaust channel 324, resulting in the inability of flue gas and other emissions to flow to the pressure relief structure 212 in time, causing the pressure relief structure 212 to fail to open in time, thereby improving the timeliness of the opening of the pressure relief structure 212 and reducing the risk of thermal runaway of the battery 100 monomer.

[0085] According to some embodiments of the present application, optionally, a size L1 of the exhaust duct 324 is 1 to 1.5 times a size L2 of the support rib 325 adjacent to the exhaust duct 324 .

[0086] Specifically, the size L1 of the exhaust channel 324 may be 1, 1.1, 1.2, 1.3 or 1.5 times the size L2 of the support rib 325 adjacent to the exhaust channel 324. When the widths of the plurality of exhaust channels 324 are substantially the same and the widths of the support ribs 325 are substantially the same, the size L1 of any exhaust channel 324 is 1 to 1.5 times the size L2 of any support rib 325.

[0087] The size restrictions on the exhaust duct 324 and the support ribs 325 in this embodiment can take into account the strength and flow area of ​​the exhaust structure 32. When the battery 100 monomer does not have thermal runaway, the exhaust structure 32 has good support strength, and the support ribs 325 can abut against the electrode assembly 23 to provide strong support for the electrode assembly 23, thereby reducing the possibility of the electrode assembly 23 shaking in the shell 22. When the battery 100 monomer has thermal runaway, the smoke and other emissions generated in the battery 100 monomer can impact the pressure relief structure 212 relatively smoothly through the exhaust duct 324, and the support ribs 325 can fall off in time after melting, thereby reducing the possibility of the exhaust structure 32 melting and blocking the exhaust duct 324.

[0088] According to some embodiments of the present application, optionally, a size L1 of the exhaust duct 324 is 1.2 to 1.5 times a size L2 of the support rib 325 adjacent to the exhaust duct 324 .

[0089] It can be understood that the size L1 of the exhaust duct 324 is greater than or equal to 1.2 times the size L2 of the support rib 325. While better taking into account the strength of the exhaust structure 32, it can be more conducive to the support rib 325 falling off in time after melting, thereby reducing the possibility of the exhaust structure 32 melting and clogging the exhaust duct 324.

[0090] According to some embodiments of the present application, optionally, a size L2 of the support rib 325 ranges from 0.4 mm to 3.0 mm, and / or a size L1 of the exhaust duct 324 ranges from 0.5 mm to 3 mm.

[0091] In some embodiments, the size L2 of the support rib 325 ranges from 0.4 mm to 3.0 mm. Specifically, the size L2 of the support rib 325 can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 1.8 mm, 2 mm, 2.5 mm or 3 mm.

[0092] In some embodiments, the size L1 of the exhaust passage 324 ranges from 0.5 mm to 3 mm. Specifically, the size L1 of the exhaust passage 324 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 1.8 mm, 2 mm, 2.5 mm or 3 mm.

[0093] The size restrictions on the support ribs 325 and / or the exhaust ducts 324 in this embodiment can make the exhaust structure 32 have better strength, while retaining less solid material, which is beneficial to reducing costs. In addition, since the support ribs 325 are thinner, the support ribs 325 can melt and fall off quickly when melting, thereby reducing the possibility of the exhaust structure 32 melting and clogging the exhaust duct 324.

[0094] According to some embodiments of the present application, optionally, a size L2 of the support rib 325 ranges from 0.8 mm to 1.5 mm; and / or a size L1 of the exhaust duct 324 ranges from 0.8 mm to 1.8 mm.

[0095] In some embodiments, the dimension L2 of the support rib 325 ranges from 0.8 mm to 1.5 mm.

[0096] In some embodiments, the size L1 of the exhaust passage 324 ranges from 0.8 mm to 1.8 mm.

[0097] It can be understood that the size limitation of the support rib 325 and / or the exhaust duct 324 in this embodiment can better balance the strength of the exhaust structure 32 and the timeliness of the melting and falling of the support rib 325.

[0098] According to some embodiments of the present application, optionally, Figure 5 and Figure 6 As shown, along the direction from the end cover 21 toward the electrode assembly 23 , the size of the support rib 325 is H1 , and the size L2 of the support rib 325 is greater than the size H1 of the support rib 325 .

[0099] The dimension H1 of the support rib 325 can be understood as the thickness of the support rib 325, which is the distance between two opposite sides of the support rib 325 along the height direction Z of the battery 100. When the thickness of the support rib 325 at different positions is different, for example, the support rib 325 is a non-uniform diameter rib, the dimension H1 of the support rib 325 along the second direction Y can be the maximum thickness of the support rib 325. In this embodiment, the thickness of the support rib 325 along the length direction is substantially the same.

[0100] In this embodiment, the thickness of the support rib 325 is set to be smaller than the width of the support rib 325, which can facilitate the processing of the support rib 325. For example, the support rib 325 can be an injection-molded plastic part. Since the width of the support rib 325 is greater than the thickness, it is easier to form. At the same time, while maintaining the strength of the support rib 325, the cross-sectional area of ​​the support rib 325 can be reduced, which is beneficial to increase the speed at which the support rib 325 melts and falls, and reduce the possibility that the support rib 325 contacts other support ribs 325 due to melting, thereby blocking the exhaust duct 324.

[0101] According to some embodiments of the present application, optionally, a size L2 of the support rib 325 is 1.5 to 3 times the size H1 of the support rib 325 .

[0102] The size L2 of the support rib 325 may be 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times, 2.2 times, 2.3 times, 2.5 times, 2.8 times or 3 times the size H1 of the support rib 325 .

[0103] The setting of the thickness and width of the support rib 325 in this embodiment can take into account the strength and melting drop speed of the support rib 325 , and the support rib 325 is easier to form, which is beneficial to improving the processing efficiency and processing rationality of the insulating protection component 30 .

[0104] According to some embodiments of the present application, optionally, a dimension H1 of the support rib 325 ranges from 0.2 mm to 1.5 mm.

[0105] The size H1 of the supporting rib 325 may be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm.

[0106] It should be noted that, in this embodiment, the size L2 of the support rib 325 may range from 0.4 mm to 3.0 mm.

[0107] The limitation of the size H1 of the support rib 325 in this embodiment can further take into account the strength and melting drop speed of the support rib 325, and the support rib 325 is easier to form.

[0108] According to some embodiments of the present application, optionally, the dimension H1 of the support rib 325 ranges from 0.5 mm to 1 mm.

[0109] According to some embodiments of the present application, optionally, Figures 4 to 6 As shown, the insulating protection member 30 further includes a body 31 , and an exhaust port 311 is disposed on the body 31 . The pressure relief structure 212 and the exhaust structure 32 are disposed opposite to each other through the exhaust port 311 and are located on opposite sides of the body 31 .

[0110] The body 31 and the exhaust structure 32 of the insulating protection member 30 can be an integral structure, specifically an injection-molded integral structure, or a structure connected as one by bonding, etc. The body 31 and the exhaust structure 32 can be made of the same material, both of which can be insulating materials, specifically plastic parts.

[0111] The side (top surface) of the body 31 facing the end cover 21 can be connected to the end cover 21, and the exhaust port 311 on the body 31 passes through the side of the body 31 facing the end cover 21 and the side of the body 31 away from the end cover 21, that is, the exhaust port 311 passes through the top surface and the bottom surface of the body 31. The exhaust structure 32 and the pressure relief structure 212 are arranged opposite to each other through the exhaust port 311. It can be understood that the protruding structure 34 and the pressure relief structure 212 are arranged corresponding to the position of the exhaust port 311, and are arranged on both sides of the exhaust port 311, and are opposite to each other through the exhaust port 311. Since the end cover 21 is arranged on the top surface side of the insulating protective member 30, the pressure relief structure 212 on the end cover 21 is arranged on the top surface side of the body 31 (the side facing the end cover 21), and the corresponding exhaust structure 32 is arranged on the bottom surface side of the body 31 (the side away from the end cover 21). Specifically, the exhaust structure 32 may be disposed directly below the exhaust port 311 , and the pressure relief structure 212 may cover directly above the exhaust port 311 .

[0112] It can be understood that the pressure relief structure 212 and the exhaust structure 32 are respectively arranged on both sides of the main body 31, so that the exhaust structure 32 and the pressure relief structure 212 are arranged at intervals. In this way, the smoke and other emissions in the battery 100 monomer can pass through the exhaust structure 32 and flow to the pressure relief structure 212 more smoothly, and when the support ribs 325 of the exhaust structure 32 are melted, the molten material is not easy to contact or block the pressure relief structure 212, which reduces the possibility of the exhaust structure 32 melting and blocking the pressure relief structure 212, improves the timeliness of the opening of the pressure relief structure 212, and reduces the risk of thermal runaway of the battery 100 monomer.

[0113] According to some embodiments of the present application, optionally, continue to refer to Figures 4 to 6 As shown, the exhaust structure 32 also includes a support wall 322, one end of which is connected to the body 31, the support rib 325 is connected to the other end of the support wall 322, and a connecting port 323 connected to the exhaust port 311 is provided on the support wall 322.

[0114] The support wall 322 is connected to the side of the body 31 away from the end cover 21, that is, the support wall 322 and the support rib 325 are both arranged on the bottom side of the body 31. The support wall 322 can be connected to the body 31 at the upper end and connected to the support rib 325 at the lower end. The support wall 322 and the body 31 and the support wall 322 and the support rib 325 can be an integral structure. The support wall 322, the support rib 325, and the body 31 can be made of the same material, for example, they can be plastic parts of the same material.

[0115] The communication port 323 and the exhaust passage 324 have the same function, and both of them can allow exhaust to pass through.

[0116] The support rib 325 may be connected to the bottom end of the support wall 322. The support rib 325 and the exhaust duct 324 are structures formed on the bottom surface of the exhaust structure 32. In other words, the support rib 325 and the exhaust duct 324 form the bottom surface of the exhaust structure 32. The exhaust structure 32 may be similar or identical in shape to the pressure relief area 213 of the pressure relief structure 212. For example, the pressure relief area 213 may be a runway-shaped structure with a rectangular middle portion and semicircular ends connected to the rectangle. The pressure relief structure 212 is also configured as a roughly runway-shaped structure.

[0117] The support rib 325 is connected to the body 31 through the support wall 322, which can increase the interval between the support rib 325 and the body 31, and reduce the possibility of the support rib 325 contacting and blocking the pressure relief structure 212 when melting; the setting of the support wall 322 is conducive to the support rib 325 to abut and support the electrode assembly 23 without increasing the thickness of the support rib 325, thereby improving the stability of the electrode assembly 23 in the shell 22. The support wall 322 is provided with a connecting port 323, which can increase the flow area of ​​the exhaust structure 32, which is conducive to the timely flow of emissions such as smoke to the pressure relief structure 212 through the exhaust structure 32.

[0118] According to some embodiments of the present application, optionally, referring to Figures 4 to 6 As shown, the support wall 322 includes a first side wall 3221 and a second side wall 3222 that are arranged opposite to each other, and the support rib 325 is respectively connected to the first side wall 3221 and the second side wall 3222 at both ends along the second direction Y, and the connecting port 323 is provided on the first side wall 3221 and / or the second side wall 3222 corresponding to the position of the exhaust duct 324, and the connecting port 323 is connected to the corresponding exhaust duct 324, and the second direction Y intersects with the first direction X, and intersects with the direction of the end cover 21 toward the electrode assembly 23.

[0119] The first side wall 3221 and the second side wall 3222 are disposed opposite to each other in the second direction Y. The second direction Y corresponds to the length direction of the exhaust passage 324. The second direction Y may be substantially perpendicular to the direction from the end cover 21 toward the electrode assembly 23 and substantially perpendicular to the first direction X.

[0120] The corresponding positions of the first side wall 3221 and the second side wall 3222 and the exhaust duct 324 are also the end positions of the exhaust duct 324 and the first side wall 3221 and the second side wall 3222 respectively corresponding to each other. That is to say, the first side wall 3221 can be hollowed out at the end of the exhaust duct 324 to form a connecting port 323 connected to the exhaust duct 324, and the second side wall 3222 can be hollowed out at the end of the exhaust duct 324 to form a connecting port 323 connected to the exhaust duct 324.

[0121] The communication port 323 may be provided only on the first side wall 3221 , may be provided only on the second side wall 3222 , or may be provided on both the first side wall 3221 and the second side wall 3222 .

[0122] The communication port 323 is in communication with the exhaust passage 324 , which is more conducive to the passage of emissions, thereby facilitating emissions such as smoke to flow to the pressure relief structure 212 through the exhaust structure 32 in a timely manner.

[0123] According to some embodiments of the present application, optionally, Figures 4 to 6As shown, the exhaust duct 324 includes a first exhaust duct 3241 and a second exhaust duct 3242, the first exhaust duct 3241 and the second exhaust duct 3242 are alternately arranged along the first direction X, the first side wall 3221 and the position of the first exhaust duct 3241 are correspondingly provided with the connecting port 323, and the second side wall 3222 and the position of the second exhaust duct 3242 are correspondingly provided with the connecting port 323.

[0124] The first exhaust channel 3241 and the second exhaust channel 3242 are both partial exhaust channels 324, which are defined for ease of description. The first exhaust channel 3241 and the second exhaust channel 3242 are alternately arranged along the first direction X, which can be understood as follows: along the first direction X, the exhaust channels 324 are arranged in the order of the first exhaust channel 3241, the second exhaust channel 3242, the first exhaust channel 3241, and the second exhaust channel 3242.

[0125] Since the first exhaust channel 3241 and the second exhaust channel 3242 are alternately arranged along the first direction X, the first side wall 3221 is provided with a connecting port 323 corresponding to the first exhaust channel 3241, and the second side wall 3222 is provided with a connecting port 323 corresponding to the second exhaust channel 3242, thus, along the first direction X, the first side wall 3221 is provided with connecting ports 323 alternately corresponding to the plurality of exhaust channels 324, and the second side wall 3222 is provided with connecting ports 323 alternately corresponding to the plurality of exhaust channels 324, and the connecting ports 323 of the second side wall 3222 and the connecting ports 323 of the first side wall 3221 are alternately arranged along the first direction X. This alternating arrangement of the connecting ports 323 on the first side wall 3221 and the second side wall 3222 can reduce the influence of the connecting ports 323 on the strength of the first side wall 3221 and the second side wall 3222 while increasing the flow area of ​​the discharge structure, which is conducive to maintaining the strength of the discharge structure.

[0126] According to some embodiments of the present application, optionally, Figure 6 As shown, and further combined Figure 7 and Figure 8 , Figure 7 The following schematically shows the insulating protection components of some embodiments of the present application. Figure 8 As shown in the BB cross-sectional view of the figure, along the direction from the end cover 21 toward the electrode assembly 23, the size of the connecting port 323 is D1, the size of the supporting wall 322 is D2, and D1 is less than or equal to 1 / 2 times D2.

[0127] The size of the support wall 322 is the distance between the top and bottom of the support wall 322, and the size of the communication port 323 is the distance between the upper end and the bottom end of the communication port 323. The size of the lower end of the communication port 323 along the first direction X may be substantially the same as the size L1 of the corresponding exhaust passage 324, and the upper end of the communication port 323 may be arc-shaped.

[0128] The limitation on the size of the communication port 323 in this embodiment can take into account both the flow area of ​​the communication port 323 and the strength of the support wall 322 .

[0129] According to some embodiments of the present application, optionally, Figure 6 As shown, along the direction from the end cover 21 toward the electrode assembly 23, the size of the support rib 325 is H1, and the size D1 of the communication port 323 is greater than or equal to the size H1 of the support rib.

[0130] In this embodiment, the size D2 of the support wall 322 can be greater than twice the size H1 of the support rib 325. In this way, the size D1 of the connecting port 323 can simultaneously satisfy the requirements of being greater than or equal to the size H1 of the support rib and less than 1 / 2 times the size D2 of the support wall 322.

[0131] Optionally, the bottom surface of the supporting rib is substantially flush with the bottom end of the supporting wall 322, and the communication opening 323 is hollowed out from the bottom end of the supporting wall 322 and extends upward, that is, the bottom end of the communication opening 323 is consistent with the bottom end of the supporting wall 322. In this case, the size D1 of the communication opening 323 is greater than or equal to the size H1 of the supporting rib, which can be understood as that the upper edge of the communication opening 323 is higher than the top surface of the supporting rib.

[0132] The limitation on the size of the communication opening 323 in this embodiment can better take into account both the flow area of ​​the communication opening 323 and the strength of the support wall 322 .

[0133] According to some embodiments of the present application, optionally, the sum of the flow areas of all the exhaust passages 324 and the flow areas of all the connecting ports 323 is greater than the pressure relief area of ​​the pressure relief structure 212 .

[0134] The flow area of ​​the exhaust channel 324 can be understood with reference to the area of ​​the flow cross section of the exhaust channel 324. The flow cross section of the exhaust channel 324 is a cross section perpendicular to the flow direction of the exhaust in the exhaust channel 324, and can be understood with reference to the cross section of the exhaust channel 324 perpendicular to the height direction Z of the electrode assembly 23. The flow area of ​​the connecting port 323 can be understood with reference to the area of ​​the flow cross section of the connecting port 323. The flow cross section of the connecting port 323 is a cross section perpendicular to the flow direction of the exhaust in the connecting port 323, and can be understood with reference to the area of ​​the connecting port 323 in the plane where the first side wall 3221 or the second side wall 3222 is located.

[0135] The pressure relief area of ​​the pressure relief structure 212 is the area of ​​the pressure relief zone 213 that can be formed when the pressure relief structure 212 is opened, for the discharge in the battery 100 to flow out. The pressure relief zone 213 is the area of ​​the end cover 21 corresponding to the pressure relief structure 212, that is, the area of ​​the end cover 21 that can be opened by the pressure relief structure 212 and connected to the outside of the shell 22. The pressure relief structure 212 is arranged in the pressure relief zone 213. In the natural state, the pressure relief structure 212 seals the pressure relief zone 213. When the battery 100 monomer has thermal runaway, the pressure relief structure 212 can open the pressure relief zone 213. The area of ​​the pressure relief zone 213 is the area of ​​the pressure relief zone 213 in the plane where the end cover 21 is located, and does not involve the size of the pressure relief zone 213 in the thickness direction of the end cover 21.

[0136] The sum of the flow areas of all the exhaust ducts 324 and the flow areas of all the connecting ports 323 is larger than the pressure relief area of ​​the pressure relief structure 212, that is, the flow area of ​​the inlet of the exhaust structure 32 is larger than the area of ​​the pressure relief structure 212. In this way, when thermal runaway occurs in the battery 100 cell, the emissions in the battery 100 cell can flow to the pressure relief structure 212 more smoothly through the exhaust structure 32, reducing the flow limiting effect of the exhaust structure 32 on the emissions, which is conducive to the smooth opening of the pressure relief structure 212.

[0137] According to some embodiments of the present application, optionally, the sum of the flow areas of all the exhaust passages 324 and the flow areas of all the connecting ports 323 is greater than or equal to 1.2 times the pressure relief area of ​​the pressure relief structure 212 .

[0138] Specifically, the sum of the flow areas of all the exhaust passages 324 and the flow areas of all the connecting ports 323 may be 1.2 times, 1.3 times, 1.5 times, 2 times, 3 times, etc., of the pressure relief area of ​​the pressure relief structure 212 .

[0139] The maximum value of the sum of the flow areas of all the exhaust ducts 324 and the flow areas of all the connecting ports 323 is limited by the supporting strength of the exhaust structure 32, wherein, since the supporting wall 322 needs to have supporting strength, the area of ​​all the connecting ports 323 is smaller than the area of ​​the supporting wall 322, and the flow area of ​​the exhaust ducts 324 does not exceed the area of ​​the bottom surface of the exhaust structure 32.

[0140] The limitation on the flow area of ​​the exhaust structure 32 in this embodiment can take into account both the strength and the flow area of ​​the exhaust structure 32 , which is conducive to the exhaust gas flowing smoothly through the exhaust structure 32 to the pressure relief structure 212 .

[0141] According to some embodiments of the present application, optionally, Figures 6 to 8As shown, along the direction from the end cover 21 toward the electrode assembly 23 , the size of the support rib 325 is H1, and the thickness W1 of the support wall 322 is 0.8 to 1.5 times the size H1 of the support rib 325 .

[0142] The thickness W1 of the support wall 322 is the dimension of the two opposite sides of the support wall 322. For example, the thickness of the first side wall 3221 is the dimension between the two opposite sides of the first side wall 3221 along the second direction Y, and the thickness of the second side wall 3222 is the dimension between the two opposite sides of the second side wall 3222 along the second direction Y. In this embodiment, the thickness of the first side wall 3221 and the thickness of the second side wall 3222 may be the same, and both are 0.8 to 1.5 times the dimension H1 of the support rib 325. Specifically, the thickness W1 of the support wall 322 may be 0.8 times, 0.9 times, 1.0 times, 1.2 times, 1.4 times, or 1.5 times the dimension H1 of the support rib 325.

[0143] The thickness limit of the support wall 322 in this embodiment can take into account the strength of the support wall 322 and is conducive to reducing the physical structure of the insulating protection component 30, which is conducive to the exhaust structure 32 to melt and fall quickly during thermal runaway.

[0144] According to some embodiments of the present application, optionally, a thickness W1 of the support wall 322 is 1 to 1.2 times a size H1 of the support rib 325 .

[0145] The thickness limit of the support wall 322 in this embodiment can better take into account the strength of the support wall 322, and is conducive to reducing the physical structure of the insulating protection component 30, which is conducive to the rapid melting and falling of the exhaust structure 32 during thermal runaway.

[0146] According to some embodiments of the present application, optionally, the thickness W1 of the support wall 322 ranges from 0.2 mm to 2.2 mm.

[0147] The thickness W1 of the support wall 322 may be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm or 1.5 mm.

[0148] It should be noted that, in this embodiment, the size H1 of the support rib 325 may range from 0.2 mm to 1.5 mm.

[0149] The thickness limit of the support wall 322 in this embodiment can better take into account the strength of the support wall 322, and the support wall 322 is relatively thin, which is conducive to the exhaust structure 32 to melt and fall quickly during thermal runaway.

[0150] According to some embodiments of the present application, optionally, the thickness W1 of the support wall 322 ranges from 0.6 mm to 1 mm.

[0151] The thickness of the support wall 322 in this embodiment is limited to further take into account both the strength of the support wall 322 and the ease of high-temperature melting.

[0152] According to some embodiments of the present application, optionally, the main body 31 and the exhaust structure 32 are an integral structure.

[0153] Specifically, the main body 31 and the exhaust structure 32 may be integrally formed by injection molding, or may be connected as an integral structure.

[0154] In this embodiment, the main body 31 and the exhaust structure 32 are an integrated structure, which can make the insulating protection member 30 have better structural stability and is easier to process.

[0155] According to some embodiments of the present application, optionally, the insulating protection component 30 is a plastic component.

[0156] According to some embodiments of the present application, optionally, the support rib 325 abuts against the electrode assembly 23 .

[0157] Some embodiments of the present application further provide a battery 100 , comprising the battery 100 monomer proposed in the present application or any embodiment of the present application.

[0158] Some embodiments of the present application further provide an electrical device, comprising the battery 100 of any of the above solutions, and the battery 100 is used to provide electrical energy to the electrical device.

[0159] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0160] According to some embodiments of the present application, Figures 3 to 8As shown, this embodiment provides a battery 100 monomer including a shell 22, an end cover 21, an electrode assembly 23 and an insulating protection member 30, the shell 22 has an opening, the end cover 21 covers the opening, the end cover 21 is provided with a pressure relief structure 212, the electrode assembly 23 is arranged in the shell 22, the insulating protection member 30 is arranged on the side of the end cover 21 facing the electrode assembly 23, the insulating protection member 30 has an exhaust structure 32 corresponding to the position of the exhaust structure 212, and the exhaust structure 32 includes a plurality of support ribs 325, a plurality of the support ribs 325 are sequentially arranged at intervals along a first direction X, and an exhaust channel 324 is formed between adjacent support ribs 325. Along the first direction X, the size of the exhaust channel 324 is L1 and the size of the support rib 325 is L2, the size L2 of the support rib 325 ranges from 0.8 mm to 1.5 mm, and the size L1 of the exhaust channel 324 ranges from 0.8 mm to 1.8 mm. The first direction X intersects with the direction of the end cap 21 toward the electrode assembly 23. Along the direction of the end cap 21 toward the electrode assembly 23, the size of the support rib 325 is H1, and the size H1 of the support rib 325 ranges from 0.5 mm to 1 mm. The insulating protection member 30 also includes a body 31, and an exhaust port 311 is provided on the body 31. The pressure relief structure 212 and the exhaust structure 32 are arranged opposite to each other through the exhaust port 311 and are respectively located on opposite sides of the body 31. The exhaust structure 32 further includes a support wall 322, one end of which is connected to the body 31, and the support rib 325 is connected to the other end of the support wall 322. The support wall 322 includes a first side wall 3221 and a second side wall 3222 that are oppositely arranged. The two ends of the support rib 325 along the second direction Y are respectively connected to the first side wall 3221 and the second side wall 3222. The second direction Y intersects with the first direction X and intersects with the direction of the end cover 21 toward the electrode assembly 23. The exhaust channel 324 includes a first exhaust channel 3241 and a second exhaust channel 3242. The first exhaust channel 3241 and the second exhaust channel 3242 are alternately arranged along the first direction X. The communication port 323 is correspondingly arranged at the position of the first side wall 3221 and the first exhaust channel 3241, and the communication port 323 is correspondingly arranged at the position of the second side wall 3222 and the second exhaust channel 3242. Along the direction from the end cover 21 to the electrode assembly 23, the size of the communication port 323 is D1, the size of the support wall 322 is D2, D1 is less than or equal to 1 / 2 times D2, and greater than or equal to the size H1 of the support rib. The sum of the flow area of ​​all the exhaust passages 324 and the flow area of ​​all the communication ports 323 is greater than or equal to 1.2 times the pressure relief area of ​​the pressure relief structure 212.The thickness of the first side wall 3221 and the second side wall 3222 is 0.6 mm to 1 mm.

[0161] The main body 31 and the exhaust structure 32 are an integrated structure, and the insulating protection member 30 is a plastic member. The supporting rib 325 is in contact with the electrode assembly 23 .

[0162] The bottom surface of the main body 31 may be provided with a protruding structure 34 at both ends of the exhaust structure 32 along the first direction X. The protruding structure 34 may be an integral structure with the exhaust structure 32 . The protruding structure 34 and the supporting ribs 325 are both in contact with the main body 232 of the electrode assembly 23 .

[0163] Protrusions 33 may also be provided at opposite ends of the body along the second direction. The protrusions 33 are located on a side connected to the body 31 facing the electrode assembly 23 . The protrusions 33 abut against the electrode assembly 23 , and are spaced apart from the protruding structure 34 .

[0164] The protrusions 33 may be provided at both ends of the body 31 along the length direction and extend along the width direction of the body 31. The protrusions 33 may support the body 31 and may abut against the electrode assembly 23 to increase the fixing effect on the electrode assembly 23 and reduce the possibility of vibration or shaking of the electrode assembly 23 in the housing 22. The protrusions 33 may be provided with a hollow structure.

[0165] The protrusion 33 can be made of the same material as the body 31 , and can be an integral structure with the body 31 .

[0166] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing having an opening; An end cover, covering the opening, and provided with a pressure relief structure; An electrode assembly is disposed in the housing; An insulating protective member is arranged on a side of the end cover facing the electrode assembly, the insulating protective member has an exhaust structure corresponding to the position of the pressure relief structure, the exhaust structure includes a plurality of support ribs, the plurality of support ribs are arranged in sequence along a first direction, and an exhaust duct is formed between adjacent support ribs, along the first direction, the size of the exhaust duct is L1 and the size of the support rib is L2, the size L1 of the exhaust duct is greater than or equal to the size L2 of the support rib adjacent to the exhaust duct, and the first direction intersects with the direction of the end cover toward the electrode assembly.

2. The battery cell according to claim 1, characterized in that: The size L1 of the exhaust duct is 1 to 1.5 times the size L2 of the support rib adjacent to the exhaust duct.

3. The battery cell according to claim 2, characterized in that: The size L1 of the exhaust duct is 1.2 to 1.5 times the size L2 of the support rib adjacent to the exhaust duct.

4. The battery cell according to claim 2, characterized in that: The size L2 of the support ribs ranges from 0.4 mm to 3.0 mm, and / or the size L1 of the exhaust duct ranges from 0.5 mm to 3 mm.

5. The battery cell according to claim 4, characterized in that: The size L2 of the support ribs ranges from 0.8 mm to 1.5 mm, and / or the size L1 of the exhaust duct ranges from 0.8 mm to 1.8 mm.

6. The battery cell according to claim 1, characterized in that: Along the direction from the end cover toward the electrode assembly, the size of the support rib is H1, and the size L2 of the support rib is greater than the size H1 of the support rib.

7. The battery cell according to claim 6, characterized in that: The size L2 of the support rib is 1.5 to 3 times the size H1 of the support rib.

8. The battery cell according to claim 7, characterized in that: The size H1 of the support ribs ranges from 0.2 mm to 1.5 mm.

9. The battery cell according to claim 8, characterized in that: The size H1 of the support ribs ranges from 0.5 mm to 1 mm.

10. The battery cell according to claim 1, characterized in that: The insulating protection member further comprises a body, an exhaust port is arranged on the body, and the pressure relief structure and the exhaust structure are arranged opposite to each other through the exhaust port and are respectively located at two opposite sides of the body.

11. The battery cell according to claim 10, characterized in that: The exhaust structure further includes a supporting wall, one end of which is connected to the body, the supporting rib is connected to the other end of the supporting wall, and a connecting port connected to the exhaust port is provided on the supporting wall.

12. The battery cell according to claim 11, characterized in that: The support wall includes a first side wall and a second side wall that are arranged opposite to each other, and the two ends of the support rib along the second direction are respectively connected to the first side wall and the second side wall, and the connecting port is arranged on the first side wall and / or the second side wall corresponding to the position of the exhaust duct, and the connecting port is connected to the corresponding exhaust duct, and the second direction intersects with the first direction and intersects with the direction of the end cover toward the electrode assembly.

13. The battery cell according to claim 12, characterized in that: The exhaust duct includes a first exhaust duct and a second exhaust duct, the first exhaust duct and the second exhaust duct are alternately arranged along the first direction, the first side wall is provided with the communication port corresponding to the position of the first exhaust duct, and the second side wall is provided with the communication port corresponding to the position of the second exhaust duct.

14. The battery cell according to claim 12, characterized in that: Along the direction from the end cover toward the electrode assembly, the size of the communication port is D1, the size of the support wall is D2, and D1 is less than or equal to 1 / 2 times D2.

15. The battery cell according to claim 14, characterized in that: Along the direction from the end cover toward the electrode assembly, the size of the support rib is H1, and the size D1 of the communication port is greater than or equal to the size H1 of the support rib.

16. The battery cell according to claim 11, characterized in that: The sum of the flow areas of all the exhaust passages and the flow areas of all the connecting ports is greater than the pressure relief area of ​​the pressure relief structure.

17. The battery cell according to claim 16, characterized in that: The sum of the flow areas of all the exhaust passages and the flow areas of all the connecting ports is greater than or equal to 1.2 times the pressure relief area of ​​the pressure relief structure.

18. The battery cell according to any one of claims 11 to 17, characterized in that: Along the direction from the end cover toward the electrode assembly, the size of the support rib is H1, and the thickness W1 of the support wall is 0.8 times to 1.5 times the size H1 of the support rib.

19. The battery cell according to claim 18, characterized in that: The thickness W1 of the support wall is 1 to 1.2 times the size H1 of the support rib.

20. The battery cell according to claim 18, characterized in that: The thickness W1 of the support wall ranges from 0.2 mm to 2.2 mm.

21. The battery cell according to claim 20, characterized in that: The thickness W1 of the support wall ranges from 0.6 mm to 1 mm.

22. The battery cell according to any one of claims 10 to 17, characterized in that: The main body and the exhaust structure are an integrated structure.

23. The battery cell according to any one of claims 1 to 17, characterized in that: The insulating protection part is a plastic part.

24. The battery cell according to any one of claims 1 to 17, characterized in that: The supporting rib is in contact with the electrode assembly.

25. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 24.

26. An electrical device, characterized in that: The battery according to claim 25 is used to provide electrical energy.

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