A battery cell and a battery pack

Abstract

This application provides a battery cell and a battery pack, relating to the field of battery technology. The battery cell includes: a housing, an explosion-proof valve disposed within the housing, and an electrode assembly, a first insulating layer, an insulating film, and multiple support structures disposed within the housing. The first insulating layer is connected to the side of the electrode assembly near the explosion-proof valve. The insulating film encloses the electrode assembly and the first insulating layer. A first vent hole penetrating along a first direction is provided on the side of the insulating film near the explosion-proof valve. The first insulating layer, the first vent hole, and the explosion-proof valve are arranged opposite to each other along the first direction. Multiple support structures are located between the insulating film and the housing along the first direction, with adjacent support structures spaced apart. The support structures and the first vent hole are spaced apart along a second direction, and the explosion-proof valve and the support structures are spaced apart along the second direction. Based on the above structural design, the safety of the battery cell is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell and a battery pack. Background Technology

[0002] Battery cells are a crucial component of battery packs. To mitigate the risk of dual failures—electrical insulation failure and thermal runaway—battery cells typically employ a thermoelectric separation design, where the explosion-proof valve is located on the casing, away from the terminals. However, when a battery cell experiences thermal runaway, the high-temperature, high-pressure gas between the insulating film and the electrode assembly struggles to flow to the explosion-proof valve, thus compromising the cell's safety. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery cell and a battery pack, which aims to solve the technical problem that high-temperature and high-pressure gas between the insulating film and the electrode assembly is difficult to flow to the explosion-proof valve, thus affecting the safety of the battery cell.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] In a first aspect, embodiments of this application provide a battery cell having a first direction and a second direction perpendicular to each other, and comprising:

[0006] case;

[0007] Electrode assembly, disposed within the housing;

[0008] An explosion-proof valve is disposed within the housing;

[0009] A first insulating layer is disposed inside the housing and connected to the side of the electrode assembly near the explosion-proof valve;

[0010] An insulating film is disposed inside the housing and wraps the electrode assembly and the first insulating layer. The insulating film has a first vent hole that penetrates along the first direction on the side near the explosion-proof valve. The first insulating layer, the first vent hole and the explosion-proof valve are arranged opposite to each other along the first direction.

[0011] Multiple support structures are disposed within the housing and located between the insulating film and the housing along the first direction. Adjacent support structures are spaced apart. The support structures and the first vent are spaced apart along the second direction. The explosion-proof valve and the support structures are spaced apart along the second direction.

[0012] In one embodiment of the first aspect, the orthogonal projection area of ​​the first insulating layer on the housing along the first direction is greater than the area of ​​the first vent hole.

[0013] In one embodiment of the first aspect, the battery cell further includes a plurality of second insulating layers connected to the side of the electrode assembly near the explosion-proof valve. The second insulating layers and the first insulating layer are spaced apart along the second direction. The insulating film encloses the plurality of second insulating layers. The side of the insulating film near the explosion-proof valve is provided with a plurality of second vent holes penetrating along the first direction. The plurality of second vent holes are spaced apart along the second direction. The first vent hole is located between two adjacent second vent holes along the second direction. Each second insulating layer and a second vent hole are arranged opposite to each other along the first direction.

[0014] In one embodiment of the first aspect, the projected area of ​​the second insulating layer on the housing along the first direction is greater than the area of ​​the second vent hole.

[0015] In one embodiment of the first aspect, the battery cell has a third direction that is perpendicular to both the first direction and the second direction, the first vent extends along the second direction, and the second vent extends along the third direction.

[0016] In one embodiment of the first aspect, the battery cell further includes a plurality of third insulating layers, a portion of which is connected to one side of the electrode assembly along the second direction, and another portion of which is connected to the other side of the electrode assembly along the second direction. The insulating film encapsulates the plurality of third insulating layers, and the insulating film is provided with third vent holes on both sides along the second direction. Each third insulating layer and each third vent hole are disposed opposite to each other along the second direction.

[0017] In one embodiment of the first aspect, the projected area of ​​the third insulating layer on the housing along the second direction is greater than the area of ​​the third vent.

[0018] In one embodiment of the first aspect, the battery cell has a third direction that is perpendicular to both the first direction and the second direction, the first vent extends along the second direction, and the third vent extends along the third direction.

[0019] In one embodiment of the first aspect, the battery cell further includes an end cap and a terminal post, the end cap being connected to the housing, the explosion-proof valve and the end cap being disposed opposite each other along the first direction, the terminal post being disposed on the end cap, and a plurality of the third vent holes being disposed close to the terminal post in the first direction.

[0020] In one embodiment of the first aspect, the battery cell has a third direction that is perpendicular to both the first direction and the second direction, and the support structure is provided with a plurality of air guide grooves that penetrate along the second direction on the side away from the insulating film, and the plurality of air guide grooves are spaced apart along the third direction.

[0021] In one embodiment of the first aspect, the battery cell has a third direction perpendicular to both the first and second directions, and the support structure is provided with a plurality of vent holes penetrating along the second direction, the plurality of vent holes being spaced apart along the third direction. In a second aspect, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect.

[0022] The beneficial effects of this application are as follows:

[0023] In the battery cell provided in this application, multiple support structures are disposed within the housing and positioned between the insulating film and the housing along a first direction, creating a gap between the insulating film near the explosion-proof valve and the housing. Simultaneously, a first vent hole is provided on the side of the insulating film near the explosion-proof valve, penetrating the insulating film along a first direction. The first vent hole and the explosion-proof valve are positioned opposite each other along the first direction, facilitating the dissipation of high-temperature, high-pressure gas between the insulating film and the electrode assembly along the first direction through the aforementioned first vent hole and gap to the explosion-proof valve for discharge. Furthermore, since the battery cell also includes a first insulating layer connected to the side of the electrode assembly near the explosion-proof valve, with the first insulating layer and the first vent hole positioned opposite each other along the first direction, the risk of insulation failure at the first vent hole is reduced, allowing for an increase in the size of the first vent hole to improve venting efficiency. Therefore, the safety of the battery cell is improved.

[0024] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A three-dimensional structural schematic diagram of a battery in one embodiment of this application is shown;

[0027] Figure 2 It shows Figure 1 Decomposition structure diagram Figure 1;

[0028] Figure 3 It shows Figure 1 Decomposition structure diagram Figure 2 ;

[0029] Figure 4 It shows Figure 3 A schematic diagram of the assembly structure of the middle electrode assembly and the insulating film from a single perspective;

[0030] Figure 5 It shows Figure 3 Another perspective on the assembly structure of the middle electrode assembly and insulating film;

[0031] Figure 6 It shows Figure 3 Another perspective on the assembly structure of the middle electrode assembly and insulating film;

[0032] Figure 7 It shows Figure 3 A schematic diagram of the assembly structure of the insulating film and multiple supporting structures from a single perspective;

[0033] Figure 8 It shows Figure 7 Enlarged structural diagram of region A in the middle;

[0034] Figure 9 It shows Figure 3 Another perspective on the assembly structure of the insulating film and multiple supporting structures;

[0035] Figure 10 A three-dimensional structural diagram of the support structure of a battery cell is shown in another embodiment of this application.

[0036] Explanation of key component symbols:

[0037] 100-Battery cell; 110-Housing shell; 120-End cap; 130-Terminal post; 140-Electrode assembly; 141-Electrode body; 142-Taper; 150-Explosion-proof valve; 161-First insulating layer; 162-Second insulating layer; 163-Third insulating layer; 170-Insulating film; 171-First vent; 172-Second vent; 173-Third vent; 180-Support structure; 181-Gas channel; 182-Gas port; 183-First elliptical support; 184-Second elliptical support; 191-First insulating component; 192-Second insulating component; Z-First direction; X-Second direction; Y-Third direction. Detailed Implementation

[0038] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0039] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0042] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "attachment," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In the description of this application, the term "and / or" indicates that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0044] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0045] Battery cells are a crucial component of battery packs. To mitigate the risk of dual failures—electrical insulation and thermal runaway—battery cells typically employ a thermoelectric separation design, where the explosion-proof valve is located on the casing, away from the terminals on the end cap. However, when a battery cell experiences thermal runaway, the high-temperature, high-pressure gas between the insulating film and the electrode assembly struggles to flow to the explosion-proof valve, thus compromising the cell's safety.

[0046] like Figure 1 As shown, to solve the above-mentioned technical problems, embodiments of this application provide a battery cell 100, which relates to the field of battery technology and is mainly used in battery packs, so as to be indirectly used in electrical devices or energy storage devices in the form of battery packs. Of course, the battery cell 100 can also be directly used in electrical devices or energy storage devices without taking the form of a battery pack, and no specific limitation is made to the application scenarios of the battery cell 100 here.

[0047] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, new energy vehicles, etc., and new energy vehicles can be pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles, etc.; spacecraft can be airplanes, rockets, space shuttles, drones, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools can be metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices include energy storage containers, energy storage cabinets, energy storage power stations, wind power generation devices, solar power generation devices, mobile power devices, and temporary power supply devices, etc.; no specific limitations are made on the types of electrical devices and energy storage devices here.

[0048] like Figure 2 , Figure 3and Figure 5 As shown, the battery cell 100 provided in this embodiment has a first direction Z and a second direction X that are perpendicular to each other, and includes: a housing 110, an electrode assembly 140, an explosion-proof valve 150, a first insulating layer 161, an insulating film 170 and a plurality of support structures 180.

[0049] The electrode assembly 140 is disposed within the housing 110; the explosion-proof valve 150 is disposed within the housing 110; the first insulating layer 161 is disposed within the housing 110 and connected to the side of the electrode assembly 140 near the explosion-proof valve 150; the insulating film 170 is disposed within the housing 110 and wraps around the electrode assembly 140 and the first insulating layer 161, and the side of the insulating film 170 near the explosion-proof valve 150 is provided with a first vent hole 171 penetrating along the first direction Z, the first insulating layer 161, the first vent hole 171 and the explosion-proof valve 150 are arranged opposite each other along the first direction Z; a plurality of support structures 180 are disposed within the housing 110 and are located between the insulating film 170 and the housing 110 along the first direction Z, two adjacent support structures 180 are spaced apart, the support structures 180 and the first vent hole 171 are spaced apart along the second direction X, and the explosion-proof valve 150 and the support structures 180 are spaced apart along the second direction X.

[0050] It is understood that in the battery cell 100 provided in this embodiment, since multiple support structures 180 are disposed within the housing 110 and located between the insulating film 170 and the housing 110 along the first direction Z, there is a gap between the side of the insulating film 170 near the explosion-proof valve 150 and the housing 110. At the same time, a first vent hole 171 is provided on the side of the insulating film 170 near the explosion-proof valve 150. The first vent hole 171 penetrates the insulating film 170 along the first direction Z, and the first vent hole 171 and the explosion-proof valve 150 are arranged opposite each other along the first direction Z. This facilitates the connection of the insulating film 170 and the electrode assembly. The high-temperature, high-pressure gas between 140°C and the first vent hole and gap is dispersed along the first direction Z to the explosion-proof valve 150 for discharge. Furthermore, since the battery cell 100 also includes a first insulating layer 161 connected to the side of the electrode assembly 140 near the explosion-proof valve 150, and the first insulating layer 161 and the first vent hole 171 are arranged opposite each other along the first direction Z, the risk of insulation failure at the first vent hole 171 is reduced. This allows for increasing the size of the first vent hole 171 to improve exhaust efficiency; that is, the presence of the first insulating layer 161 allows the first vent hole 171 to be designed to be larger. Therefore, the safety of the battery cell 100 is improved.

[0051] In one embodiment, the projected area of ​​the first insulating layer 161 along the first direction Z on the housing 110 is larger than the area of ​​the first vent 171, so that the first insulating layer 161 can completely block the first vent 171, thereby achieving better insulation.

[0052] It should be noted that the area of ​​the first vent 171 can be understood as the area of ​​the closed region formed by the orthographic projection of the wall of the first vent 171 along the first direction Z onto the housing 110. When the first vent 171 is a circular hole, the area of ​​the circular hole is... , where r is the radius of the circular hole. The areas of the second vent 172 and the third vent 173 mentioned below are also the same, and will not be described in detail here.

[0053] like Figure 2 , Figure 3 and Figure 5 As shown, in one embodiment, the battery cell 100 further includes a plurality of second insulating layers 162. The plurality of second insulating layers 162 are connected to the side of the electrode assembly 140 near the explosion-proof valve 150. The second insulating layers 162 and the first insulating layer 161 are spaced apart along the second direction X. An insulating film 170 wraps the plurality of second insulating layers 162. The side of the insulating film 170 near the explosion-proof valve 150 is provided with a plurality of second vent holes 172 penetrating along the first direction Z. The plurality of second vent holes 172 are spaced apart along the second direction X. The first vent hole 171 is located between two adjacent second vent holes 172 along the second direction X. Each second insulating layer 162 and each second vent hole 172 are arranged opposite each other along the first direction Z.

[0054] It should be noted that "each second insulating layer 162 and one second vent hole 172 are arranged opposite to each other along the first direction Z" can be understood as follows: the number of second insulating layers 162 and the number of second vent holes 172 are the same, and in the first direction Z, multiple second insulating layers 162 and multiple second vent holes 172 are arranged in a one-to-one correspondence. The same applies to the third insulating layer 163 and the third vent hole 173 mentioned below, which will not be elaborated on here.

[0055] It is understandable that since the insulating membrane 170 is provided with a plurality of second vent holes 172 on the side near the explosion-proof valve 150, and the second vent holes 172 penetrate the insulating membrane 170 along the first direction Z, it is convenient to disperse the high temperature and high pressure gas generated between the insulating membrane 170 and the electrode assembly 140 along the first direction Z through the second vent holes 172 and the gap to the explosion-proof valve 150 for discharge.

[0056] Meanwhile, since the battery cell 100 also includes a plurality of second insulating layers 162 connected to the side of the electrode assembly 140 near the explosion-proof valve 150, the second insulating layers 162 and the second vent hole 172 are arranged opposite to each other along the first direction Z, which reduces the risk of insulation failure at the second vent hole 172, thereby making it easier to increase the size of the second vent hole 172 to improve exhaust efficiency. That is, the presence of the second insulating layer 162 allows the second vent hole 172 to be designed to be larger.

[0057] Furthermore, the projected area of ​​the second insulating layer 162 along the first direction Z on the housing 110 is larger than the area of ​​the second vent 172, so that the second insulating layer 162 can completely block the second vent 172, thereby achieving better insulation.

[0058] like Figure 2 and Figure 9 As shown, the battery cell 100 further includes a third direction Y that is perpendicular to both the first direction Z and the second direction X. A first vent 171 extends along the second direction X, meaning it is elongated and its length is parallel to the second direction X. A second vent 172 extends along the third direction Y, meaning it is elongated and its length is parallel to the third direction Y. This effectively expands the exhaust range of the first vent 171 and the second vent 172, thereby improving exhaust efficiency.

[0059] like Figure 3 , Figure 4 and Figure 6 As shown, in one embodiment, the battery cell 100 further includes a plurality of third insulating layers 163. A portion of the plurality of third insulating layers 163 is connected to one side of the electrode assembly 140 along the second direction X, and another portion of the third insulating layers 163 is connected to the other side of the electrode assembly 140 along the second direction X. An insulating film 170 wraps the plurality of third insulating layers 163. A third vent hole 173 is provided on both sides of the insulating film 170 along the second direction X. Each third insulating layer 163 and a third vent hole 173 are arranged opposite to each other along the second direction X.

[0060] It is understandable that since the insulating film 170 is provided with third vent holes 173 on both sides along the second direction X, it is convenient to disperse the high temperature and high pressure gas generated between the insulating film 170 and the electrode assembly 140 along the second direction X through the third vent holes 173 and the gap to the explosion-proof valve 150 for discharge.

[0061] Meanwhile, since the battery cell 100 also includes multiple third insulating layers 163, a portion of the third insulating layer 163 is connected to one side of the electrode assembly 140 along the second direction X, and another portion of the third insulating layer 163 is connected to the other side of the electrode assembly 140 along the second direction X. The third insulating layer 163 and the third vent 173 are arranged opposite to each other along the second direction X. This reduces the risk of insulation failure at the third vent 173, thereby making it easier to increase the size of the third vent 173 to improve exhaust efficiency. In other words, the presence of the third insulating layer 163 allows the third vent 173 to be designed to be larger.

[0062] Furthermore, the projected area of ​​the third insulating layer 163 along the second direction X on the housing 110 is larger than the area of ​​the third vent 173, so that the third insulating layer 163 can completely block the third vent 173, thereby achieving better insulation.

[0063] Furthermore, the battery cell 100 has a third direction Y that is perpendicular to both the first direction Z and the second direction X. The first vent 171 extends along the second direction X, that is, the first vent 171 is elongated and its length direction is parallel to the second direction X. The third vent 173 extends along the third direction Y, that is, the third vent 173 is elongated and its length direction is parallel to the third direction Y. In this way, the exhaust range of the first vent 171 and the third vent 173 can be effectively expanded, thereby improving the exhaust efficiency.

[0064] like Figures 2 to 4 As shown, the battery cell 100 further includes an end cap 120 and a terminal post 130. The end cap 120 is connected to the housing 110. The explosion-proof valve 150 and the end cap 120 are arranged opposite each other along the first direction Z. The terminal post 130 is disposed on the end cap 120. Multiple third vent holes 173 are all disposed close to the terminal post 130 along the first direction Z. That is, relative to the explosion-proof valve 150, the third vent holes 173 are located closer to the terminal post 130 on the insulating film 170. This facilitates the dissipation of high-temperature and high-pressure gas generated between the electrode assembly 140 and the insulating film 170 and close to the terminal post 130 to the explosion-proof valve 150.

[0065] like Figure 2 , Figure 7 and Figure 8 As shown, in some embodiments, the battery cell 100 has a third direction Y that is perpendicular to both the first direction Z and the second direction X (i.e., the first direction Z, the second direction X, and the third direction Y are perpendicular to each other). The support structure 180 is provided with a plurality of air guide grooves 181 that run through the second direction X on the side away from the insulating film 170. The plurality of air guide grooves 181 are spaced apart along the third direction Y, which facilitates the guidance of high temperature and high pressure gas to the explosion-proof valve 150 along the second direction X, thereby improving the exhaust efficiency.

[0066] like Figure 2 and Figure 10 As shown, in some other embodiments, the battery cell 100 has a third direction Y that is perpendicular to both the first direction Z and the second direction X. The support structure 180 is provided with a plurality of vent holes 182 that penetrate along the second direction X. The plurality of vent holes 182 are spaced apart along the third direction Y, which also facilitates the guidance of high temperature and high pressure gas along the second direction X to the explosion-proof valve 150, thereby improving the exhaust efficiency.

[0067] like Figure 2 and Figure 9As shown, in some embodiments, the battery cell 100 has a third direction Y that is perpendicular to both the first direction Z and the second direction X. A portion of the multiple support structures 180 are multiple first elliptical support members 183 extending along the second direction X, and another portion of the support structures 180 are multiple second elliptical support members 184 extending along the third direction Y. Adjacent second elliptical support members 184 are spaced apart along the second direction X, and the multiple first elliptical support members 183 are all located between two adjacent second elliptical support members 184 along the second direction X.

[0068] Understandably, the smoother edges of the elliptical support reduce airflow resistance, making it easier for high-temperature, high-pressure gas to reach the explosion-proof valve 150, thereby improving exhaust efficiency.

[0069] like Figure 9 As shown, further, the orthogonal projections of two adjacent first elliptical support members 183 along the third direction Y on the housing 110 at least partially overlap, so that the combined first elliptical support members 183 provide a wider support range for the electrode assembly 140, thereby improving the stability of the electrode assembly 140 within the housing 110.

[0070] like Figures 1 to 3 As shown, the battery cell 100 also includes a first insulating member 191 and a second insulating member 192. The first insulating member 191 is located outside the housing 110 and is disposed between the terminal post 130 and the end cap 120 to insulate the terminal post 130 and the end cap 120. The second insulating member 192 is located inside the housing 110 and is disposed between the end cap 120 and the electrode assembly 140 to insulate the electrode assembly 140 and the end cap 120. This reduces the risk of short circuit in the battery cell 100.

[0071] It should be noted that in the battery cell 100 provided in this embodiment, the connection between the insulating layer and the electrode assembly 140 can be by bonding, hot-melt connection, snap-fit, spray coating, etc., and no specific limitation is made here. The material of the end cap 120 and / or the shell 110 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., and no specific limitation is made here. The material of the electrode post 130 can be a metallic conductive material (e.g., copper, aluminum, silver, gold, iron, nickel, etc.) or a non-metallic conductive material (e.g., carbon-based material, superconductor, semiconductor, etc.), and no specific limitation is made here. The insulating film 170 can be Mylar film (biaxially oriented polyester film made of polyethylene terephthalate), polypropylene film, polyethylene film, polyvinyl chloride film, polycarbonate film, etc., and no specific limitation is made here.

[0072] In addition, the materials for the insulating components, the insulating layers, and the supporting structure 180 can be selected from the following categories: 1. Synthetic organic insulating materials: plastics (such as polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, epoxy resin, etc.), synthetic rubbers (such as silicone rubber, nitrile rubber, etc.), synthetic fibers (such as polyester fiber, nylon, etc.); 2. Natural organic insulating materials: wood, natural rubber, etc.; 3. Inorganic insulating materials: ceramics, glass, mica, quartz, asbestos, etc.; 4. Polymer insulating materials: polycarbonate, polyimide, etc., without specific limitations.

[0073] It should be noted that the battery cell 100 provided in this embodiment mainly relies on the movement of metal ions between the positive and negative electrode plates to operate. The battery cell 100 can be cuboid, cylindrical, flat, or other shapes, and no specific limitation is made here. According to the packaging method, the battery cell 100 provided in this embodiment can be a square battery cell 100, a cylindrical battery cell 100, a pouch battery cell 100, etc., and no specific limitation is made here.

[0074] Furthermore, according to the classification of the physical state of the electrolyte, the battery cell 100 provided in this embodiment can be a liquid battery, that is, it uses a liquid electrolyte. Exemplarily, the electrode post 130 may include a positive electrode post and a negative electrode post, and the electrode assembly 140 may include an electrode body 141 and tabs 142. The tabs 142 include a positive tab and a negative tab. The electrode body 141 is immersed in the liquid electrolyte and includes a positive electrode plate, a negative electrode plate, and a separator layer. The separator layer is disposed between the positive electrode plate and the negative electrode plate, and the material of the separator layer can be PP (polypropylene), PE (polyethylene), etc. The positive electrode plate includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive tab is connected to the positive current collector and to the positive electrode post. The negative electrode plate includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative tab is connected to the negative current collector and to the negative electrode post. Taking lithium ions as an example, the materials for the positive electrode current collector and the positive electrode tab can be aluminum, and the materials for the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.; the materials for the negative electrode current collector and the negative electrode tab can be copper, and the negative electrode active material can be graphite, silicon, etc.

[0075] Of course, the battery cell 100 provided in this embodiment can also be a solid-state battery, that is, a solid electrolyte, such as sulfide, oxide or polymer electrolyte. Solid electrolyte can replace the separator and liquid electrolyte, and has both ion conduction and isolation functions. The type of battery cell 100 is not specifically limited here.

[0076] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including the battery cell 100 from any of the above embodiments.

[0077] It is understood that since the battery pack provided in this embodiment has the battery cell 100 in any of the above embodiments, it has all the beneficial effects of the battery cell 100, which will not be described in detail here.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery cell, characterized in that, It has a first direction (Z) and a second direction (X) that are perpendicular to each other, and includes: Casing (110); An electrode assembly (140) is disposed within the housing (110); An explosion-proof valve (150) is disposed in the housing (110); A first insulating layer (161) is disposed inside the housing (110) and connected to the side of the electrode assembly (140) near the explosion-proof valve (150); An insulating film (170) is disposed inside the housing (110) and wraps the electrode assembly (140) and the first insulating layer (161). The insulating film (170) has a first vent hole (171) extending along the first direction (Z) on the side near the explosion-proof valve (150). The first insulating layer (161), the first vent hole (171) and the explosion-proof valve (150) are arranged opposite to each other along the first direction (Z). Multiple support structures (180) are disposed within the housing (110) and located between the insulating film (170) and the housing (110) along the first direction (Z). Adjacent support structures (180) are spaced apart. The support structures (180) and the first vent (171) are spaced apart along the second direction (X). The explosion-proof valve (150) and the support structures (180) are spaced apart along the second direction (X).

2. The battery cell according to claim 1, characterized in that, The area of ​​the first insulating layer (161) projected onto the housing (110) along the first direction (Z) is greater than the area of ​​the first vent (171).

3. The battery cell according to claim 1, characterized in that, The battery cell further includes a plurality of second insulating layers (162), which are connected to the side of the electrode assembly (140) near the explosion-proof valve (150). The second insulating layers (162) and the first insulating layer (161) are spaced apart along the second direction (X). The insulating film (170) wraps the plurality of second insulating layers (162). The side of the insulating film (170) near the explosion-proof valve (150) is provided with a plurality of second vent holes (172) that penetrate along the first direction (Z). The plurality of second vent holes (172) are spaced apart along the second direction (X). The first vent hole (171) is located between two adjacent second vent holes (172) along the second direction (X). Each second insulating layer (162) and a second vent hole (172) are arranged opposite to each other along the first direction (Z).

4. The battery cell according to claim 3, characterized in that, The area of ​​the second insulating layer (162) projected onto the housing (110) along the first direction (Z) is greater than the area of ​​the second vent (172).

5. The battery cell according to claim 3, characterized in that, The battery cell has a third direction (Y) that is perpendicular to both the first direction (Z) and the second direction (X). The first vent (171) extends along the second direction (X), and the second vent (172) extends along the third direction (Y).

6. The battery cell according to claim 1, characterized in that, The battery cell further includes a plurality of third insulating layers (163). A portion of the plurality of third insulating layers (163) is connected to one side of the electrode assembly (140) along the second direction (X), and another portion of the third insulating layers (163) is connected to the other side of the electrode assembly (140) along the second direction (X). An insulating film (170) wraps the plurality of third insulating layers (163). The insulating film (170) is provided with third vent holes (173) on both sides along the second direction (X). Each third insulating layer (163) and each third vent hole (173) are arranged opposite to each other along the second direction (X).

7. The battery cell according to claim 6, characterized in that, The area of ​​the third insulating layer (163) projected onto the housing (110) along the second direction (X) is greater than the area of ​​the third vent (173).

8. The battery cell according to claim 6, characterized in that, The battery cell has a third direction (Y) that is perpendicular to both the first direction (Z) and the second direction (X). The first vent (171) extends along the second direction (X), and the third vent (173) extends along the third direction (Y).

9. The battery cell according to claim 6, characterized in that, The battery cell also includes an end cap (120) and a terminal post (130). The end cap (120) is connected to the housing (110). The explosion-proof valve (150) and the end cap (120) are arranged opposite to each other along the first direction (Z). The terminal post (130) is disposed on the end cap (120). A plurality of third vent holes (173) are disposed close to the terminal post (130) in the first direction (Z).

10. The battery cell according to any one of claims 1 to 9, characterized in that, The battery cell has a third direction (Y) that is perpendicular to both the first direction (Z) and the second direction (X). The support structure (180) has a plurality of air guide grooves (181) that extend through the second direction (X) on the side away from the insulating film (170). The plurality of air guide grooves (181) are spaced apart along the third direction (Y).

11. The battery cell according to any one of claims 1 to 9, characterized in that, The battery cell has a third direction (Y) that is perpendicular to both the first direction (Z) and the second direction (X). The support structure (180) is provided with a plurality of air guide holes (182) that penetrate along the second direction (X). The plurality of air guide holes (182) are spaced apart along the third direction (Y).

12. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1 to 11.

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