Battery cell, battery, electric device, battery cell manufacturing apparatus and method

Abstract

This application provides a battery cell, a battery, an electrical device, a manufacturing apparatus for the battery cell, and a method thereof, belonging to the field of battery technology. The battery cell includes a casing, an electrode assembly, and an insulating component. The casing includes a bottom wall and side walls surrounding the bottom wall. The electrode assembly is housed within the casing. The insulating component includes a first insulating portion and a second insulating portion connected together. The first insulating portion separates the electrode assembly from the bottom wall and has a through-hole. The second insulating portion separates the electrode assembly from the side walls. The insulating component also includes a folded portion, which is foldably disposed on the first insulating portion. The first insulating portion is configured to be stacked with the first insulating portion to cover the through-hole. When the folded portion is stacked relative to the first insulating portion, it covers the through-hole, preventing ions from the electrode assembly from reaching the casing through the through-hole, thus reducing the risk of internal short circuits within the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery, an electrical device, and a manufacturing apparatus and method for the battery cell. Background Technology

[0002] With the rapid development of smartphones, tablets, and electric vehicles, the application of lithium-ion batteries is becoming increasingly widespread, thus placing higher demands on them. For example, batteries are required to have better safety performance, and internal short circuits are one of the main causes of electrical safety problems.

[0003] A battery short circuit generates excessive heat, potentially causing a fire or damaging electrical appliances, thus threatening property and lives. Therefore, reducing the risk of battery short circuits is a pressing issue in the field of battery technology. Summary of the Invention

[0004] This application provides a battery cell, a battery, an electrical device, and a manufacturing apparatus and method for the battery cell, in order to reduce the risk of internal short circuits in the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing, an electrode assembly, and an insulating member; the housing includes a bottom wall and side walls surrounding the bottom wall; the electrode assembly is housed within the housing; the insulating member includes a first insulating portion and a second insulating portion connected together, the first insulating portion separating the electrode assembly and the bottom wall, the first insulating portion having a through hole, and the second insulating portion separating the electrode assembly and the side walls; wherein, the insulating member further includes a folded portion, the folded portion being foldably disposed on the first insulating portion, the first insulating portion being configured to be stacked with the first insulating portion to cover the through hole.

[0006] In the above technical solution, the folding portion is foldably disposed on the first insulating portion. The folding portion can be in an unfolded state or a stacked state relative to the first insulating portion. When the folding portion is in the unfolded state relative to the first insulating portion, the insulating component can be positioned through the through hole to cooperate with the assembly device for assembling battery cells, thereby positioning the insulating component on the assembly device to improve the assembly quality of the battery cells. When the folding portion is in the stacked state relative to the first insulating portion, the folding portion can cover the through hole, preventing ions from the electrode assembly from reaching the casing through the through hole, reducing the risk of internal short circuits in the battery cell.

[0007] In some embodiments of the first aspect of this application, the insulating member includes a plurality of the folded portions, which are stacked or arranged side by side.

[0008] In the above technical solution, the insulating component includes multiple folded portions arranged in layers or side by side. If multiple folded portions are stacked, the distance between the electrode assembly and the bottom wall can be increased, which can better prevent ions from reaching the casing through the through-hole, thereby reducing the risk of internal short circuits in the battery cell. If multiple folded portions are arranged side by side, the coverage area of ​​the folded portions on the first insulating component can be increased in the same plane, so as to better prevent ions from reaching the casing through the through-hole, thereby reducing the risk of internal short circuits in the battery cell.

[0009] In some embodiments of the first aspect of this application, the first insulating portion is provided with a plurality of through holes, and each of the folded portions covers each of the through holes.

[0010] In the above technical solution, each folded section covers each through-hole, preventing ions from reaching the casing through any through-hole and reducing the risk of internal short circuits in the battery cell. It also reduces the number of folded sections, facilitating the manufacturing of insulating components. Furthermore, if there are multiple folded sections, each through-hole can be covered multiple times, further reducing the risk of ions reaching the casing through the through-holes.

[0011] In some embodiments of the first aspect of this application, along a first direction, a portion of the plurality of folded portions is located on one side of the first insulating portion, and another portion of the plurality of folded portions is located on the other side of the first insulating portion, wherein the first direction is the thickness direction of the first insulating portion.

[0012] In the above technical solution, some of the multiple folded portions are located on one side of the thickness direction of the first insulating portion, and another portion of the multiple folded portions are located on the other side of the thickness direction of the first insulating portion. Thus, the multiple folded portions can cover the through hole from both sides of the axial direction of the through hole, which can better prevent ions from reaching the casing through the through hole, thereby reducing the risk of internal short circuit in the battery cell.

[0013] In some embodiments of the first aspect of this application, the insulating member includes two folded portions, the first insulating portion having two first edge portions arranged opposite to each other along a second direction, one end of each of the two folded portions being foldably connected to the two first edge portions along the second direction, the second direction being perpendicular to the thickness direction of the first insulating portion.

[0014] In the above technical solution, the two folding parts are respectively foldably connected to the two first edge parts, which facilitates the folding parts to fold relative to the first insulating part and avoids mutual interference when the two folding parts fold relative to the first insulating part.

[0015] In some embodiments of the first aspect of this application, the electrode assembly has two first side surfaces disposed opposite to each other along the second direction; the second insulating portion includes two first partitions, the two first partitions being used to cover the two first side surfaces respectively, the two first partitions being connected to the two folded portions respectively, the first end of the folded portion being foldably connected to the first insulating portion, and the second end of the folded portion opposite to the first end being connected to the first partition.

[0016] In the above technical solution, the second insulating part includes two first partitions respectively connected to the folding part. The first end of the folding part is foldably connected to the first insulating part, and the second end of the folding part is connected to the first partition. The first end and the second end are arranged opposite to each other, so that the first partition can be folded relative to the folding part to separate the first side of the electrode assembly and the housing.

[0017] In some embodiments of the first aspect of this application, a first crease is formed at the connection position between the folded portion and the first edge portion, and / or a second crease is formed at the connection position between the first partition portion and the folded portion; the first crease and the second crease extend along a third direction, and the thickness direction of the first insulating portion, the second direction, and the third direction are perpendicular to each other.

[0018] In the above technical solution, the folding part can be folded relative to the first insulating part around the first fold line, and the first dividing part can be folded relative to the folding part around the second fold line. The first fold line and the second fold line extend in the same direction, which can prevent the folding action of the folding part relative to the first insulating part and the folding action of the first dividing part relative to the folding part from interfering with each other.

[0019] In some embodiments of the first aspect of this application, the electrode assembly includes two second side surfaces arranged opposite each other along a third direction; the second insulating portion further includes a second partition, each of the first partitions being connected to both ends along the third direction, the second partition being used to cover the second side surface; the thickness direction of the first insulating portion, the second direction, and the third direction are perpendicular to each other.

[0020] In the above technical solution, the second insulating member further includes a second partition, which is used to separate the second side and the housing, so that the second insulating member separates the sidewall of the electrode assembly from the housing, thereby reducing the risk of internal short circuit in the battery cell.

[0021] In some embodiments of the first aspect of this application, the electrode assembly has two first side surfaces disposed opposite to each other along a third direction; the second insulating portion includes two first partitions, the two first partitions being used to cover the two first side surfaces respectively; the two first partitions are respectively connected to two second edge portions of the first insulating portion disposed opposite to each other along the third direction, the thickness direction of the first insulating portion, the second direction and the third direction are perpendicular to each other.

[0022] In the above technical solution, the two folding parts are respectively foldably connected to the two first edge parts of the first insulating part along the second direction, and the two first separating parts are respectively foldably connected to the two second edge parts of the first insulating part arranged opposite to each other along the third direction. This can reduce the difficulty of folding the folding parts and reduce the risk of mutual interference when the folding parts and the first separating parts are folded.

[0023] In some embodiments of the first aspect of this application, the electrode assembly includes two second side surfaces arranged opposite to each other along the second direction; the second insulating portion further includes a second partition portion, each of the first partition portions being connected to both ends along the second direction, the second partition portion being used to cover the second side surface; the thickness direction of the first insulating portion, the second direction, and the third direction are perpendicular to each other.

[0024] In the above technical solution, the second insulating member further includes a second partition, which is used to separate the second side and the sidewall of the housing, so that the second insulating member separates the sidewall of the electrode assembly from the housing, thereby reducing the risk of internal short circuit in the battery cell.

[0025] In some embodiments of the first aspect of this application, the inner surface of the sidewall and the inner surface of the bottom wall are connected by an arc transition surface; the first insulating portion and the folded portion are configured to change the height position of the electrode assembly relative to the bottom wall to avoid the arc transition surface from squeezing the electrode assembly.

[0026] In the above technical solution, the first insulating part is disposed between the bottom wall of the housing and the electrode assembly. This not only separates the bottom wall and the electrode assembly, reducing the risk of internal short circuits in the battery cell, but also changes the height position of the electrode assembly relative to the bottom wall, preventing the arc transition surface from squeezing the electrode assembly and reducing the risk of electrode wrinkling caused by interference between the electrode assembly and the arc transition surface.

[0027] Secondly, embodiments of this application provide a battery, including the battery cell provided in any of the embodiments of the first aspect.

[0028] In the above technical solution, the through holes of the insulating component of the battery cell are covered by the folded part, so that the ions of the electrode assembly cannot reach the casing through the through holes, reducing the risk of internal short circuits in the battery cell and thus improving the safety performance of the battery.

[0029] Thirdly, embodiments of this application provide an electrical device, including the battery provided in the second aspect embodiment.

[0030] In the above technical solution, the electrical equipment includes the battery provided in the second aspect embodiment. The battery has a low risk of internal short circuit and high safety performance, thereby improving the electrical safety of the electrical equipment.

[0031] Fourthly, embodiments of this application provide a manufacturing apparatus for a battery cell, including a providing device and an assembly device; the providing device is configured to provide a housing, an electrode assembly, and an insulating member, the housing including a bottom wall and side walls surrounding the bottom wall, the insulating member including a first insulating portion and a second insulating portion connected together, the first insulating portion having a through hole; the assembly device is configured to cover the electrode assembly with the insulating member around the electrode assembly and to place the electrode assembly inside the housing, such that the first insulating portion separates the electrode assembly from the bottom wall and the second insulating portion separates the electrode assembly from the side walls; wherein, the insulating member further includes a folded portion, the folded portion being foldably disposed on the first insulating portion, the folded portion being configured to be stacked with the first insulating portion to cover the through hole.

[0032] Fifthly, embodiments of this application provide a method for manufacturing a single battery cell, comprising:

[0033] A housing, an electrode assembly, and an insulating element are provided. The housing includes a bottom wall and side walls surrounding the bottom wall. The insulating element includes a first insulating portion and a second insulating portion connected together, the first insulating portion having a through hole.

[0034] The insulating component is wrapped around the outer periphery of the electrode assembly;

[0035] The electrode assembly is disposed within the housing such that the first insulating portion separates the electrode assembly from the bottom wall and the second insulating portion separates the electrode assembly from the side wall;

[0036] The insulating member further includes a folded portion, which is foldably disposed on the first insulating portion and is configured to be stacked with the first insulating portion to cover the through hole. Attached Figure Description

[0037] 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.

[0038] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0039] Figure 2 This application provides schematic diagrams of the battery structure for some embodiments.

[0040] Figure 3 Exploded views of a single battery cell provided in some embodiments of this application;

[0041] Figure 4 This is a partial schematic diagram of a battery cell provided in some embodiments of this application;

[0042] Figure 5 Partial schematic diagram of a battery cell provided for other embodiments of this application;

[0043] Figure 6 Partial schematic diagram of a battery cell provided for other embodiments of this application (side walls of the casing are not shown);

[0044] Figure 7 A schematic diagram showing the unfolded state of an insulating member provided in some embodiments of this application;

[0045] Figure 8 for Figure 7 A schematic diagram of one of the folded portions of the insulating component after it has been folded relative to the first insulating component;

[0046] Figure 9 for Figure 8 A schematic diagram of another folded portion of the insulating component after it has been folded relative to the first insulating component;

[0047] Figure 10 for Figure 7 A schematic diagram of the insulating component after it has been completely folded up;

[0048] Figure 11 A schematic diagram showing the unfolded state of the insulating element provided in other embodiments of this application;

[0049] Figure 12 for Figure 11 Enlarged view of point I in the middle;

[0050] Figure 13 A schematic diagram of the structure of a battery cell manufacturing apparatus provided in some embodiments of this application;

[0051] Figure 14 This is a flowchart illustrating a method for manufacturing a single battery cell according to some embodiments of this application.

[0052] Icons: 1000 - Vehicle; 100 - Battery; 10 - Housing; 11 - Installation Space; 12 - First Part; 13 - Second Part; 20 - Battery Cell; 21 - Housing; 211 - Opening; 212 - Bottom Wall; 213 - Side Wall; 214 - Transition Surface; 22 - Electrode Assembly; 221 - First Side; 222 - Second Side; 23 - End Cap Assembly; 231 - End Cap; 232 - Electrode Terminal; 233 - End Cap Protector; 24 - Protective Film; 25 - Current Collector; 26 - Insulator; 261 - First Insulating Part; 2611 - Through Hole; 2612 - First Edge; 2613 - Second edge portion; 262 - Second insulating portion; 2621 - First dividing portion; 2622 - Second dividing portion; 263 - Folded portion; 2631 - First end; 2632 - Second end; 264 - Gap; 265 - First crease; 266 - Second crease; 267 - Third crease; 268 - Fourth crease; 269 - Perforation; 200 - Controller; 300 - Motor; 2000 - Manufacturing equipment for battery cells; 2100 - Supply device; 2200 - Assembly device; X - First direction; Y - Second direction; Z - Third direction; I - Straight portion; II - Bending portion. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0054] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0055] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0056] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0057] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to 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, it should not be construed as a limitation on this application. Furthermore, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0058] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0059] A battery cell includes a casing, an electrode assembly, and an insulating component. The insulating component separates the electrode assembly from the casing to prevent short circuits caused by contact between the electrode assembly and the casing. To facilitate battery cell assembly, the bottom wall portion of the insulating component that separates the electrode assembly and the casing has through holes. These through holes are used to mate with and position the battery cell assembly device, thereby positioning the insulating component on the assembly device and improving assembly quality.

[0060] The inventors discovered that ions from the electrode assembly can reach the casing through through-holes, causing internal short circuits in the battery cells and posing a safety hazard. To prevent ions from reaching the casing through these through-holes, the holes can be sealed by attaching tape to the insulating components. However, the tape will peel off after prolonged immersion in the electrolyte, rendering the seal ineffective.

[0061] Based on the above considerations, in order to reduce the risk of ions passing through the through hole, the inventors, after in-depth research, designed a battery cell. The insulating part of the battery cell includes a first insulating part and a second insulating part connected together. The first insulating part is used to separate the electrode assembly and the bottom wall of the housing. The first insulating part is provided with a through hole. The second insulating part is used to separate the electrode assembly and the side wall of the housing. The insulating part also includes a folded part, which is foldably disposed on the first insulating part. The first insulating part is configured to be stacked with the first insulating part to cover the through hole.

[0062] The battery cells disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using battery cells and batteries disclosed in this application. This helps reduce the risk of ions passing through through-holes and the risk of internal short circuits in the battery, thereby improving the safety performance of the battery cells.

[0063] The technical solutions described in the embodiments of this application are applicable to batteries and electrical devices that use batteries.

[0064] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, 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 include 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. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0065] For ease of explanation, the following embodiments will use a vehicle 1000 as an example of electrical equipment.

[0066] Please refer to Figure 1 The vehicle 1000 has a battery 100 installed inside it. The battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as the operating power source for the vehicle 1000.

[0067] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0068] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0069] Please refer to Figure 2 The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10.

[0070] The housing 10 provides an installation space 11 for the battery cell 20. In some embodiments, the housing 10 may include a first portion 12 and a second portion 13, which overlap each other to define the installation space 11 for accommodating the battery cell 20. The connection between the first portion 12 and the second portion 13 can be sealed using a sealant (not shown), such as a sealing ring, sealant, etc.

[0071] The first part 12 and the second part 13 can be of various shapes, such as cuboids, cylinders, etc. The first part 12 can be a hollow structure with an opening on one side to form a cavity for accommodating the battery cell 20, and the second part 13 can also be a hollow structure with an opening on one side to form a cavity for accommodating the battery cell 20. The opening side of the second part 13 covers the opening side of the first part 12, thus forming a housing 10 with an installation space 11. Alternatively, the first part 12 can be a hollow structure with an opening on one side to form a cavity for accommodating the battery cell 20, and the second part 13 can be a plate-like structure. The second part 13 covers the opening side of the first part 12, thus forming a housing 10 with an installation space 11.

[0072] In battery 100, there can be one or more battery cells 20. If there are multiple battery cells 20, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 20 is housed in the housing 10. Alternatively, multiple battery cells 20 can first be connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed manner to form a whole, which is then housed in the housing 10. Battery cells 20 can be cylindrical, flat, cuboid, or other shapes. Figure 2 An example is shown where the battery cell 20 is cuboid.

[0073] In some embodiments, the battery 100 may also include a busbar (not shown), through which multiple battery cells 20 can be electrically connected to each other to achieve series, parallel, or mixed connection of multiple battery cells 20.

[0074] Please refer to Figure 3 The battery cell 20 may include a housing 21, an electrode assembly 22, and an end cap assembly 23. The housing 21 has an opening 211, the electrode assembly 22 is housed within the housing 21, and the end cap assembly 23 is used to seal the opening 211.

[0075] The housing 21 can be of various shapes, such as a cylinder or a cuboid. The shape of the housing 21 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, the housing 21 can be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the housing 21 can be a cuboid structure. Figure 3 An example is shown where the housing 21 and electrode assembly 22 are square.

[0076] The shell 21 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc. This application embodiment does not impose any special restrictions on this.

[0077] In some embodiments, a protective film 24 is further provided on the outer surface of the housing 21, covering the outer surface of the housing 21. The protective film 24 can provide insulation, high temperature resistance, and other functions. The protective film 24 can be a blue film.

[0078] The electrode assembly 22 may include a positive electrode (not shown), a negative electrode (not shown), and a separator (not shown). The electrode assembly 22 can be a wound structure formed by winding the positive electrode, separator, and negative electrode, or a stacked structure formed by arranging the positive electrode, separator, and negative electrode in layers. The electrode assembly 22 also includes a positive electrode tab (not shown) and a negative electrode tab (not shown). The positive electrode tab can be a positive current collector without a positive active material layer coated on the positive electrode, and the negative electrode tab can be a negative current collector without a negative active material layer coated on the negative electrode.

[0079] The end cap assembly 23 includes an end cap 231 and an electrode terminal 232, with the electrode terminal 232 disposed on the end cap 231. The end cap 231 is used to seal the opening 211 of the housing 21 to form a sealed receiving space (not shown), which is used to receive the electrode assembly 22. The receiving space is also used to receive an electrolyte, such as an electrolyte solution. As a component that outputs electrical energy from the electrode assembly 22, the end cap assembly 23 has an electrode terminal 232 that is electrically connected to the electrode assembly 22, i.e., the electrode terminal 232 is electrically connected to the tab of the electrode assembly 22. For example, the electrode terminal 232 and the tab are connected through a current collector 25 to achieve the electrical connection between the electrode terminal 232 and the tab.

[0080] It should be noted that the opening 211 of the housing 21 can be one or two. If the housing 21 has one opening 211, the end cap assembly 23 can also be one, in which two electrode terminals 232 can be provided. The two electrode terminals 232 are used for electrical connection with the positive and negative electrode tabs of the electrode assembly 22, respectively. The two electrode terminals 232 in the end cap assembly 23 are the positive electrode terminal 232 and the negative electrode terminal 232, respectively. If the housing 21 has two openings 211, for example, the two openings 211 are located on opposite sides of the housing 21, the end cap assembly 23 can also be two, with the two end cap assemblies 23 respectively covering the two openings 211 of the housing 21. In this case, the electrode terminal 232 in one end cap assembly 23 can be the positive electrode terminal, used for electrical connection with the positive electrode tab of the electrode assembly 22; the electrode terminal 232 in the other end cap assembly 23 can be the negative electrode terminal, used for electrical connection with the negative electrode plate of the electrode assembly 22.

[0081] In some embodiments, the end cap assembly 23 further includes an end cap protector 233, which is mounted on the surface of the end cap 231 and protects the end cap 231.

[0082] Please refer to the above. Figure 3 , Figure 4 , Figure 5 , Figure 6 In some embodiments, the battery cell 20 includes a housing 21, an electrode assembly 22, and an insulating member 26; the housing 21 includes a bottom wall 212 and side walls 213 surrounding the bottom wall 212; the electrode assembly 22 is housed within the housing 21; the insulating member 26 includes a first insulating portion 261 and a second insulating portion 262 connected together, the first insulating portion 261 being used to separate the electrode assembly 22 and the bottom wall 212, the first insulating portion 261 having a through hole 2611, and the second insulating portion 262 being used to separate the electrode assembly 22 and the side wall 213; wherein, the insulating member 26 further includes a folded portion 263, the folded portion 263 being foldably disposed on the first insulating portion 261, the first insulating portion 261 being configured to be stacked with the first insulating portion 261 to cover the through hole 2611.

[0083] The opening 211 of the housing 21 is arranged opposite to the bottom wall 212. The first insulating part 261 is located between the electrode assembly 22 and the bottom wall 212 to separate the electrode assembly 22 and the bottom wall 212, so as to prevent the electrode assembly 22 from contacting the bottom wall 212 and causing a short circuit inside the battery cell 20.

[0084] The folding portion 263 is foldably disposed on the first insulating portion 261, meaning that the folding portion 263 can rotate and fold relative to the first insulating portion 261 around a certain crease. Folding the folding portion 263 relative to the first insulating portion 261 allows the first insulating portion 261 and the folding portion 263 to be in a stacked state and an unfolded state. The stacked state refers to both the folding portion 263 and the first insulating portion 261 being located between the electrode assembly 22 and the bottom wall 212, with the folding portion 263 located on the side of the first insulating portion 261 facing away from the electrode assembly 22 and / or on the side of the first insulating portion 261 facing the electrode assembly 22. The unfolded state refers to any other state of the folding portion 263 and the first insulating portion 261 besides the stacked state, including a state where the folding portion 263 and the first insulating portion 261 are coplanar.

[0085] Both the first insulating part 261 and the folded part 263 are flat plate structures. In other embodiments, the folded part 263 can also be in other structural forms, such as a pin. After the folded part 263 is folded relative to the first insulating part 261, it can be located on the side of the first insulating part 261 facing or away from the electrode assembly 22 and inserted into the through hole 2611.

[0086] When the folded portion 263 and the first insulating portion 261 are stacked, the folded portion 263 and the first insulating portion 261 can be fixed together, for example, by using adhesive to bond the folded portion 263 and the first insulating portion 261 together so that the folded portion 263 and the first insulating portion 261 remain in a stacked state; the folded portion 263 and the first insulating portion 261 can also be unfixed, and the folded portion 263 and the first insulating portion 261 can remain in a stacked state by the gravity of the electrode assembly 22.

[0087] The first insulating part 261 and the second insulating part 262 can be integrally formed, or they can be separate parts connected to form a whole structure. The folding part 263 and the first insulating part 261 can be integrally formed, or they can be separate parts connected to form a whole structure.

[0088] The folding portion 263 is foldably disposed on the first insulating portion 261. The folding portion 263 can be folded relative to the first insulating portion 261 in an unfolded state or a stacked state relative to the first insulating portion 261. When the folding portion 263 is in the unfolded state relative to the first insulating portion 261, the insulating member 26 can be positioned through the through hole 2611 to cooperate with the assembly device 2200 for assembling the battery cell 20, thereby positioning the insulating member 26 on the assembly device 2200 to improve the assembly quality of the battery cell 20. When the folding portion 263 is in the stacked state relative to the first insulating portion 261, the folding portion 263 can cover the through hole 2611, preventing ions from the electrode assembly 22 from reaching the housing 21 through the through hole 2611, reducing the risk of internal short circuits in the battery cell 20.

[0089] Please continue to refer to Figure 4 , Figure 5 , Figure 6 In some embodiments, the insulating member 26 includes a plurality of folded portions 263, which are stacked or arranged side by side.

[0090] "Multiple" refers to two or more.

[0091] For example, the insulating member 26 includes two folds 263. (As...) Figure 4 As shown, the two folded portions 263 are arranged side by side, meaning that the two folded portions 263 are arranged on the same side of the first insulating portion 261 in the direction from the bottom wall 212 toward the electrode assembly 22 (i.e., the first direction X). Both folded portions 263 are in contact with the surface of the first insulating portion 261 facing the electrode assembly 22, or both folded portions 263 are in contact with the surface of the first insulating portion 261 away from the electrode assembly 22. Along the side-by-side direction of the two folded portions 263, there may or may not be a gap 264 between the two folded portions 263. Figure 4 The diagram shows a case where the two folded portions 263 have a gap 264 in the side-by-side direction.

[0092] like Figure 5 , Figure 6 As shown, the two folded portions 263 are stacked, meaning that the two folded portions 263 are stacked in the direction from the bottom wall 212 toward the electrode assembly 22 (i.e., the first direction X), with one of the two folded portions 263 being closer to the electrode assembly 22 than the other. For example, the two folded portions 263 are stacked on the side of the first insulating portion 261 facing the electrode assembly 22, or the two folded portions 263 are stacked on the side of the first insulating portion 261 away from the electrode assembly 22, or one of the two folded portions 263 is located on the side of the first insulating portion 261 facing the electrode assembly 22, and the other is located on the side of the first insulating portion 261 away from the electrode assembly 22. Figure 5 and Figure 6 The diagram shows two folded portions 263 located on opposite sides of the first insulating portion 261. The following description uses the case where the two folded portions 263 are stacked as an example to illustrate the relevant aspects of this application.

[0093] Of course, in embodiments where the insulating member 26 includes two or more folded portions 263, some of the folded portions 263 can be stacked, and the stacked folded portions 263 are arranged side by side with another portion of the folded portions 263.

[0094] The insulating member 26 includes multiple folded portions 263 arranged in layers or side by side. If the multiple folded portions 263 are arranged in layers, the distance between the electrode assembly 22 and the bottom wall 212 can be increased, which can better prevent ions from reaching the housing 21 through the through hole 2611, thereby reducing the risk of internal short circuit in the battery cell 20. If the multiple folded portions 263 are arranged side by side, the coverage area of ​​the folded portions 263 on the first insulating member 26 can be increased in the same plane, which can better prevent ions from reaching the housing 21 through the through hole 2611, thereby reducing the risk of internal short circuit in the battery cell 20.

[0095] Please continue to refer to Figure 5 , Figure 6 In some embodiments, the first insulating portion 261 is provided with a plurality of through holes 2611, and each folded portion 263 covers each through hole 2611.

[0096] "Multiple" refers to two or more. The surface area of ​​the folded portion 263 facing the first insulating portion 261 should be large enough so that the folded portion 263 can simultaneously cover each through hole 2611. In other embodiments, some of the through holes 2611 may be covered by one folded portion 263, and another portion of the through holes 2611 may be covered by another folded portion 263. Of course, the number of folded portions 263 can also be set according to the number of through holes 2611, with each folded portion 263 corresponding to a specific through hole 2611, and each folded portion 263 covering the corresponding through hole 2611.

[0097] In other embodiments, the number of through holes 2611 may also be one.

[0098] Each fold 263 covers each through hole 2611, preventing ions from reaching the casing 21 through any through hole 2611, thus reducing the risk of internal short circuits in the battery cell 20. It also reduces the number of folds 263, facilitating the manufacture of the insulating component 26. Furthermore, if there are multiple folds 263, each through hole 2611 can be covered multiple times, further reducing the risk of ions reaching the casing 21 through the through hole 2611.

[0099] Please continue reading Figure 5 , Figure 6 In some embodiments, along the first direction X, a portion of the plurality of folded portions 263 is located on one side of the first insulating portion 261, and another portion of the plurality of folded portions 263 is located on the other side of the first insulating portion 261, wherein the first direction X is the thickness direction of the first insulating portion 261.

[0100] The first direction X is consistent with the thickness direction of the first insulating portion 261. When the folded portion 263 and the first insulating portion 261 are stacked, the stacking direction of the folded portion 263 and the first insulating portion 261 is the first direction X. For example, the insulating member 26 includes two folded portions 263, with the first insulating portion 261 located between the two folded portions 263. In other words, when the folded portions 263 and the first insulating portion 261 are stacked, the two folded portions 263 are respectively located on both sides of the first insulating portion 261 in the first direction X. In other embodiments, the two folded portions 263 may also be located on the same side of the first insulating portion 261 in the first direction X.

[0101] In embodiments where the insulating member 26 includes two or more folded portions 263, the first insulating member 261 may have at least two folded portions 263 on at least one side along the first direction X. The folded portions 263 located on the same side of the first insulating member 261 may be stacked or arranged side by side.

[0102] If a portion of the multiple folded portions 263 is located on one side of the thickness direction of the first insulating portion 261, and another portion of the multiple folded portions 263 is located on the other side of the thickness direction of the first insulating portion 261, then the two folded portions 263 can cover the through hole 2611 from both sides of the axial direction of the through hole 2611, which can better prevent ions from reaching the housing 21 through the through hole 2611, thereby reducing the risk of internal short circuit in the battery cell 20.

[0103] like Figure 7 As shown, in some embodiments, the insulating member 26 includes two folded portions 263, the first insulating portion 261 has two first edge portions 2612 arranged opposite to each other along the second direction Y, and one end of each of the two folded portions 263 is foldably connected to the two first edge portions 2612 along the second direction Y, the second direction Y being perpendicular to the thickness direction of the first insulating portion 261.

[0104] The two folded portions 263 are respectively folded and connected to the two first edge portions 2612 at one end along the second direction Y. This means that when the folded portions 263 and the first insulating portions 261 are stacked, the folded portions 263 are connected to the first edge portions 2612 at one end along the second direction Y.

[0105] In order for the two folded portions 263 to be located on opposite sides of the first insulating portion 261 along the first direction X, the folding directions of the two folded portions 263 relative to the first insulating portion 261 are opposite. For example... Figure 8 As shown, one of the two folded portions 263 is folded relative to the first insulating portion 261 along the first folding direction and located on one side of the first insulating portion 261 in the first direction X. Figure 9 As shown, the other folding portion 263 of the two folding portions 263 is folded relative to the first insulating portion 261 along the second folding direction and is located on the other side of the first insulating portion 261 in the first direction X. The first folding direction and the second folding direction are opposite, for example, the first folding direction is clockwise and the second folding direction is counterclockwise.

[0106] Of course, the two folded portions 263 can also be foldably connected to the same first edge portion 2612.

[0107] The two folding portions 263 are respectively foldably connected to the two first edge portions 2612, which facilitates the folding portions 263 to fold relative to the first insulating portion 261 and avoids mutual interference when the two folding portions 263 fold relative to the first insulating portion 261.

[0108] Please refer to the reference. Figure 7 , Figure 8 , Figure 9 In some embodiments, the electrode assembly 22 has two first side surfaces 221 disposed opposite each other along the second direction Y. Figure 3(as shown in the figure); the second insulating portion 262 includes two first partition portions 2621, which are used to cover two first side surfaces 221 respectively. The two first partition portions 2621 are respectively connected to two folding portions 263. The first end 2631 of the folding portion 263 is foldably connected to the first insulating portion 261, and the second end 2632 of the folding portion 263 opposite to the first end 2631 is connected to the first partition portion 2621.

[0109] In this embodiment, the first partition 2621 is foldably connected to the second end 2632 of the folded portion 263, so that the first partition 2621 can rotate and fold relative to the folded portion 263 around a certain crease.

[0110] In an embodiment where the electrode assembly 22 is square, the electrode assembly 22 includes a straight portion 1 and two bent portions 22, which are respectively connected to the two ends of the straight portion 1. Along the thickness direction of the electrode assembly 22, the straight portion 1 has two opposing outer surfaces. The thickness direction of the electrode assembly 22 is perpendicular to the relative arrangement direction of the two bent portions 22. The two first side surfaces 221 can be either the two outer surfaces of the straight portion 1 or the two outer surfaces of the bent portions 221. Taking the two first side surfaces 221 as examples, when the two first separating portions 2621 are folded relative to the first insulating portion 261, they can be folded to a state where the first separating portions 2621 are parallel to the two outer surfaces of the straight portion 1. The two first separating portions 2621 can respectively cover the two outer surfaces of the straight portion 1 to separate the first side surfaces 221 from the sidewall 213 of the housing 21, preventing the first side surfaces 221 and the sidewall 213 from contacting each other and causing a short circuit inside the battery cell 20.

[0111] In this embodiment, along the third direction Z, the two ends of the first insulating portion 261 may or may not be flush with the two ends of the folded portion 263. For example, as shown... Figures 7-9 As shown, along the third direction Z, the two ends of the first insulating portion 261 are not flush, and the two ends of the first insulating portion 261 extend beyond the two ends of the folded portion 263.

[0112] The second insulating portion 262 includes two first partition portions 2621 respectively connected to the folding portion 263. The first end 2631 of the folding portion 263 is foldably connected to the first insulating portion 261, and the second end 2632 of the folding portion 263 is connected to the first partition portion 2621. The first end 2631 and the second end 2632 are arranged opposite to each other, so that the first partition portion 2621 can be folded relative to the folding portion 263 to separate the first side surface 221 of the electrode assembly 22 and the housing 21.

[0113] Please continue reading Figure 7 , Figure 8 , Figure 9In some embodiments, a first crease 265 is formed at the connection position between the folded portion 263 and the first edge portion 2612, and / or a second crease 266 is formed at the connection position between the first partition portion 2621 and the folded portion 263; the first crease 265 and the second crease 266 extend along the third direction Z, and the thickness direction of the first insulating portion 261, the second direction Y and the third direction Z are perpendicular to each other.

[0114] The first crease 265 may only form at the connection point between the folded portion 263 and the first edge portion 2612, while the second crease 266 may not form at the connection point between the first dividing portion 2621 and the folded portion 263. When the first dividing portion 2621 needs to be folded relative to the folded portion 263, the folding position is determined according to actual needs, and a crease is formed after folding. Alternatively, the second crease 266 may only form at the connection point between the first dividing portion 2621 and the folded portion 263, while the first crease 265 may not form at the connection point between the folded portion 263 and the first edge portion 2612. When the folded portion 263 needs to be folded relative to the first edge portion 2612, the folding position is determined according to actual needs, and a crease is formed after folding. Alternatively, a first crease 265 may be formed at the connection position between the folded portion 263 and the first edge portion 2612, and a second crease 266 may be formed at the connection position between the first dividing portion 2621 and the folded portion 263. The folded portion 263 may be folded around the first crease 265 relative to the first insulating portion 261, and the first dividing portion 2621 may be folded around the second crease 266 relative to the folded portion 263.

[0115] like Figure 8 , Figure 9 As shown, the width of the folded portion 263 along the second direction Y is the same as the width of the first insulating portion 261 along the second direction Y. After the folded portion 263 and the first insulating portion 261 are stacked, the projection of the second crease 266 formed at the connection position of the folded portion 263 and the first dividing portion 2621 onto the first crease 265 formed at the connection position of the folded portion 263 and the first insulating portion 261 in the first direction X overlaps with the projection of the first crease 265 in the first direction X.

[0116] The first crease 265 and the second crease 266 are formed before folding, making the folding position clear and accurate, and making folding easier. The folding portion 263 can be folded relative to the first insulating portion 261 around the first crease 265, and the first dividing portion 2621 can be folded relative to the folding portion 263 around the second crease 266. The first crease 265 and the second crease 266 extend in the same direction, which can prevent the folding action of the folding portion 263 relative to the first insulating portion 261 and the folding action of the first dividing portion 2621 relative to the folding portion 263 from interfering with each other.

[0117] Please see Figure 9 , Figure 10 In some embodiments, the electrode assembly 22 includes two second side surfaces 222 arranged opposite each other along a third direction Z. Figure 3 (as shown in the figure); the second insulating part 262 also includes a second partition 2622, and each of the first partition 2621 is connected to the second partition 2622 at both ends along the third direction Z. The second partition 2622 is used to cover the second side 222; the thickness direction, the second direction Y and the third direction Z of the first insulating part 261 are perpendicular to each other.

[0118] In this embodiment, the second partition 2622 is foldably connected to the first partition 2621 so that the second partition 2622 can rotate and fold relative to the first partition 2621 around a certain crease.

[0119] In an embodiment where the electrode assembly 22 is square and the two first side surfaces 221 are the two outer side surfaces of the straight portion I, the two second side surfaces 222 are the outer side surfaces of the two bent portions II. The second partition 2622 is used to cover the surface of the bent portion II. Along the third direction Z, the two second partitions 2622 located on the same side of the two first partitions 2621 jointly cover the same second side surface 222, and the two second partitions 2622 covering the same second side surface 222 overlap each other in the second direction Y to completely cover the second side surface 222. The two second partitions 2622 covering the same second side surface 222 can be fixed or not fixed.

[0120] A third crease 267 is formed at the connection point between the second partition 2622 and the first partition 2621. The second partition 2622 can be folded relative to the first partition 2621 around the third crease 267. The third crease 267 is formed before folding, making the folding position clear and accurate, and making folding easier. Of course, the third crease 267 may not be formed between the second partition 2622 and the first partition 2621. When it is necessary for the second partition 2622 to be folded relative to the first partition 2621, the folding position is determined according to actual needs, and the crease is formed after folding. Figure 10 The image shows the state of the second partition 2622 after it has been folded relative to the first partition 2621.

[0121] Of course, if the two first side surfaces 221 are the outer side surfaces of the two bent parts II, then the two first side surfaces 221 are the two outer side surfaces of the straight part I.

[0122] The second insulating member 26 also includes a second partition 2622, which is used to separate the second side 222 and the housing 21 so that the second insulating member 262 separates the side wall 213 of the electrode assembly 22 and the housing 21, thereby reducing the risk of internal short circuit in the battery cell 20.

[0123] Of course, in other embodiments, the first insulating portion 261, the folding portion 263, the first dividing portion 2621 and the second dividing portion 2622 may have other arrangements.

[0124] For example, such as Figure 11 As shown, the electrode assembly 22 has two first side surfaces 221 arranged opposite each other along the third direction Z; the second insulating portion 262 includes two first partition portions 2621, which are used to cover the two first side surfaces 221 respectively; the two first partition portions 2621 are respectively connected to two second edge portions 2613 of the first insulating portion 261 arranged opposite each other along the third direction Z, and the thickness direction, the second direction Y and the third direction Z of the first insulating portion 261 are perpendicular to each other.

[0125] Two folded portions 263 are foldably connected to two opposite first edge portions 2612 of the first insulating portion 261 along the second direction Y. A first crease 265 formed at the connection position of the folded portions 263 and the first edge portions 2612 extends along the third direction Z. Two first separating portions 2621 are respectively connected to two opposite second edge portions 2613 of the first insulating portion 261 along the third direction Z. A fourth crease 268 formed at the connection position of the first separating portions 2621 and the second edge portions 2613 extends along the second direction Y when the insulating member 26 is in the unfolded state.

[0126] The third direction Z is perpendicular to the second direction Y. The folding part 263 and the first insulating part 261 are respectively connected to the first insulating part 261 in different directions and positions, which can reduce the difficulty of folding the folding part 263 and reduce the risk of mutual interference between the folding part 263 and the first separating part 2621 when folding.

[0127] Please continue reading Figure 11 The electrode assembly 22 includes two second side surfaces 222 arranged opposite to each other along the second direction Y; the second insulating portion 262 also includes a second partition portion 2622, and each first partition portion 2621 is connected to the second partition portion 2622 at both ends along the second direction Y. The second partition portion 2622 is used to cover the second side surface 222; the thickness direction of the first insulating portion 261, the second direction Y and the third direction Z are perpendicular to each other.

[0128] A crease is formed at the connection point between the second partition 2622 and the first partition 2621. Figure 11The third crease 267 is formed between the second partition 2621 and the first partition 2622. The second partition 2622 can be folded around the crease relative to the second partition 2622. When the second partition 2622 can cover the second side 222, the crease extends along the first direction X. The creases of the first partition 2621 and the second partition 2622 are formed before folding, so the folding position can be clearly and accurately known, and folding is easier. Of course, the third crease 267 may not be formed between the second partition 2622 and the first partition 2621. When it is necessary for the second partition 2622 to be folded relative to the first partition 2621, the folding position is determined according to the actual needs, and the crease is formed after folding.

[0129] It should be noted that the forms of the first crease 265, the second crease 266, the third crease 267, and the fourth crease 268 involved in the embodiments of this application can be various. For example, the fourth crease 268 can be a groove formed at the connection position of the first partition 2621 and the second partition 2622. Another example is... Figure 12 As shown, a plurality of perforations 269 are formed at intervals at the connection position of the first partition 2621 and the second partition 2622. The plurality of perforations 269 can be arranged at intervals according to the extension direction of the third crease 267 as needed. Figure 11 In the case where the insulating member 26 is in the unfolded state, the third crease 267 extends along the third direction Z. Therefore, when the insulating member 26 is in the unfolded state, multiple perforations 269 can be arranged at intervals along the third direction Z. The forms of the first crease 265, the second crease 266, and the fourth crease 268 can refer to the design of the third crease 267.

[0130] The second insulating member 26 also includes a second partition 2622, which is used to separate the second side 222 and the side wall 213 of the housing 21, so that the second insulating member 262 separates the side wall 213 of the electrode assembly 22 and the housing 21, thereby reducing the risk of internal short circuit in the battery cell 20.

[0131] Because there is a transition surface 214 between the side wall 213 and the bottom wall 212 of the housing 21 at the connection position ( Figure 5 As shown in the diagram, specifically, the inner surface of the sidewall 213 and the inner surface of the bottom wall 212 are connected by a transition surface 214 to increase the strength of the connection between the sidewall 213 and the bottom wall 212. The transition surface 214 can be a sloped surface or an arc surface. Due to the presence of the transition surface 214, the area of ​​the electrode assembly 22 opposite to the transition surface 214 will be squeezed by the transition surface 214 to produce wrinkles, thereby causing a short circuit inside the battery cell 20.

[0132] Based on this, please refer to Figure 5In some embodiments, the inner surface of the sidewall 213 and the inner surface of the bottom wall 212 are connected by an arc transition surface 214; the first insulating portion 261 and the folding portion 263 are configured to change the height position of the electrode assembly 22 relative to the bottom wall 212 to avoid the arc transition surface 214 from squeezing the electrode assembly 22.

[0133] The height position of the electrode assembly 22 relative to the bottom wall 212 refers to the position corresponding to different distances between the electrode assembly 22 and the bottom wall 212 along the first direction X. The first insulating part 261 is disposed between the electrode assembly 22 and the bottom wall 212, so that the distance between the electrode assembly 22 and the bottom wall 212 is greater, so that the electrode assembly 22 can be disengaged from the arc transition surface 214 so that the arc transition surface 214 cannot squeeze the electrode assembly 22.

[0134] In some embodiments, along the first direction X, both the folded portion 263 and the first insulating portion 261 are located between the electrode assembly 22 and the bottom wall 212. In this case, the distance between the electrode assembly 22 and the bottom wall 212 in the first direction X is the sum of the dimensions of the folded portion 263 and the first insulating portion 261 in the first direction X. In other embodiments, along the first direction X, only the first insulating portion 261 is located between the electrode assembly 22 and the bottom wall 212, and the folded portion 263 is not located between the electrode assembly 22 and the bottom wall 212. In this case, the distance between the electrode assembly 22 and the bottom wall 212 in the first direction X is the dimension of the first insulating portion 261 in the first direction X.

[0135] The first insulating part 261 is disposed between the bottom wall 212 of the housing 21 and the electrode assembly 22. It can not only separate the bottom wall 212 and the electrode assembly 22, reducing the risk of internal short circuit in the battery cell 20, but also change the height position of the electrode assembly 22 relative to the bottom wall 212, avoiding the arc transition surface 214 from squeezing the electrode assembly 22, and reducing the risk of electrode wrinkling caused by interference between the electrode assembly 22 and the arc transition surface 214.

[0136] This application provides a battery 100, including the battery cell 20 provided in any of the above embodiments.

[0137] When the through hole 2611 of the insulating part 26 of the battery cell 20 is covered by the folded part 263, the ions of the electrode assembly 22 cannot reach the casing 21 through the through hole 2611, reducing the risk of internal short circuit in the battery cell 20 and thus improving the safety performance of the battery 100.

[0138] This application provides an electrical device, including the battery 100 provided in the above embodiments.

[0139] The electrical equipment includes the battery 100 provided in the above embodiments. The battery 100 has a low risk of internal short circuit and high safety performance, thereby improving the electrical safety of the electrical equipment.

[0140] like Figure 13 As shown, this application embodiment provides a battery cell manufacturing apparatus 2000, which includes a providing device 2100 and an assembly device 2200. The providing device 2100 is configured to provide a housing 21, an electrode assembly 22, and an insulating member 26. The housing 21 includes and surrounds a side wall 213 around a bottom wall 212. The insulating member 26 includes a first insulating portion 261 and a second insulating portion 262 connected together. The first insulating portion 261 has a through hole 2611. The mounting device 2200 is configured to cover the outer periphery of the electrode assembly 22 with the insulating member 26 and to place the electrode assembly 22 inside the housing 21, so that the first insulating part separates the electrode assembly 22 from the bottom wall 212 and the second insulating part 262 to separate the electrode assembly 22 from the side wall 213; wherein the insulating member 26 further includes a folded part 263, the folded part 263 is foldably disposed on the first insulating part 261, and the folded part 263 is configured to be stacked with the first insulating part 261 to cover the through hole 2611.

[0141] like Figure 14 As shown in the embodiment of this application, a method for manufacturing a battery cell 20 is provided. The method for manufacturing a battery cell 20 includes:

[0142] Step S100: Provide housing 21, electrode assembly 22 and insulating member 26. Housing 21 includes bottom wall 212 and side wall 213 surrounding the bottom wall 212. Insulating member 26 includes a first insulating part 261 and a second insulating part 262 connected together. The first insulating part 261 is provided with a through hole 2611.

[0143] Step S200: The insulating component 26 is wrapped around the outer periphery of the electrode assembly 22;

[0144] Step S300: The electrode assembly 22 is disposed in the housing 21 so that the first insulating part 261 separates the electrode assembly 22 from the bottom wall 212 and the second insulating part 262 separates the electrode assembly 22 from the side wall 213.

[0145] The insulating member 26 further includes a folded portion 263, which is foldably disposed on the first insulating portion 261. The folded portion 263 is configured to be stacked with the first insulating portion 261 to cover the through hole 2611.

[0146] Step S300 is executed after step S200. In step S300, the electrode assembly 22 is placed inside the housing 21, which can be understood as placing the electrode assembly 22 covered with the insulating member 26 inside the housing 21.

[0147] This application provides a prismatic battery, which includes a housing 21, an electrode assembly 22, and an insulating member 26. The insulating member 26 includes an integrally formed first insulating portion 261, a second insulating portion 262, and two folded portions 263. The first insulating portion 261 has a through hole 2611. The first ends 2631 of the two folded portions 263 are respectively connected to two first edge portions 2612 of the first insulating portion 261 arranged opposite to each other along the second direction Y. The two folded portions 263 are folded in opposite directions relative to the first insulating portion 261, so that the two folded portions 263 are respectively located on opposite sides of the first insulating portion 261 along the first direction X, thereby covering the through hole 2611.

[0148] The second insulating portion 262 includes two first partition portions 2621 and four second partition portions 2622. The two first partition portions 2621 are foldably connected to the second ends 2632 of the folded portion 263 opposite to the first end 2631. The two first partition portions 2621 are used to cover the two outer sides of the straight portion I of the electrode assembly 22. Two of the four second partition portions 2622 are foldably connected to the two ends of one first partition portion 2621 along the third direction Z, and the other two of the four second partition portions 2622 are foldably connected to the two ends of another first partition portion 2621 along the third direction Z. The two second partition portions 2622 are used to cover the outer sides of the two bent portions II of the electrode assembly 22. Along the third direction Z, the two second partitions 2622 on the same side of the two first partitions 2621 jointly cover the outer side of the same bent part II. The two second partitions 2622 covering the outer side of the same bent part II overlap each other in the second direction Y to completely cover the second side 222. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0149] Alternatively, the second insulating portion 262 includes two first partition portions 2621 and four second partition portions 2622. The two first partition portions 2621 are foldably connected to two opposing second edge portions 2613 of the first insulating portion 261 in the third direction Z. The two first partition portions 2621 are used to cover the two outer sides of the straight portion I of the electrode assembly 22. Two of the four second partition portions 2622 are foldably connected to both ends of one first partition portion 2621 in the second direction Y, and the other two of the four second partition portions 2622 are foldably connected to both ends of another first partition portion 2621 in the second direction Y. The two second partition portions 2622 are used to cover the outer sides of the two bent portions II of the electrode assembly 22. Along the second direction Y, the two second partitions 2622 on the same side of the two first partitions 2621 together cover the outer side of the same bent portion II. The two second partitions 2622 covering the outer side of the same bent portion II overlap each other in the second direction Y to completely cover the second side 222. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0150] When the folded portion 263 is stacked relative to the first insulating portion 261, the folded portion 263 can cover the through hole 2611, so that the ions of the electrode assembly 22 cannot reach the housing 21 through the through hole 2611, reducing the risk of internal short circuit in the battery cell 20.

[0151] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The housing includes a bottom wall and side walls surrounding the bottom wall; Electrode assembly, housed within the housing; as well as An insulating component includes a first insulating portion and a second insulating portion connected together. The first insulating portion is used to separate the electrode assembly and the bottom wall. The first insulating portion is provided with a through hole. The second insulating portion is used to separate the electrode assembly and the side wall. The insulating member further includes a plurality of folded portions, which are foldably disposed on the first insulating portion. The folded portions are configured to be stacked with the first insulating portion to cover the through hole. Along a first direction, a portion of the plurality of folded portions is located on one side of the first insulating portion, and another portion of the plurality of folded portions is located on the other side of the first insulating portion. The first direction is the thickness direction of the first insulating portion.

2. The battery cell according to claim 1, characterized in that, Multiple folding sections are stacked or arranged side by side.

3. The battery cell according to claim 2, characterized in that, The first insulating portion is provided with a plurality of through holes, and each of the folded portions covers each of the through holes.

4. The battery cell according to any one of claims 1-3, characterized in that, The insulating member includes two folded portions. The first insulating portion has two first edge portions arranged opposite to each other along a second direction. One end of each of the two folded portions is foldably connected to the two first edge portions along the second direction. The second direction is perpendicular to the thickness direction of the first insulating portion.

5. The battery cell according to claim 4, characterized in that, The electrode assembly has two first sides disposed opposite to each other along the second direction; The second insulating portion includes two first partitions, which are used to cover the two first sides respectively. The two first partitions are respectively connected to the two folded portions. The first end of the folded portion is foldably connected to the first insulating portion, and the second end of the folded portion opposite to the first end is connected to the first partition.

6. The battery cell according to claim 5, characterized in that, A first crease is formed at the connection position between the folded portion and the first edge portion, and / or a second crease is formed at the connection position between the first partition portion and the folded portion; The first crease and the second crease extend along a third direction, and the thickness direction of the first insulating portion, the second direction, and the third direction are perpendicular to each other.

7. The battery cell according to claim 5, characterized in that, The electrode assembly includes two second sides arranged opposite each other along a third direction; The second insulating portion further includes a second partition portion, and each of the first partition portions is connected to the second partition portion at both ends along the third direction, the second partition portion being used to cover the second side surface; The thickness direction of the first insulating part, the second direction, and the third direction are perpendicular to each other.

8. The battery cell according to claim 4, characterized in that, The electrode assembly has two first sides disposed opposite each other along a third direction; The second insulating portion includes two first partitions, which are used to cover the two first sides respectively; The two first dividing portions are respectively connected to two second edge portions of the first insulating portion arranged opposite each other along the third direction, and the thickness direction of the first insulating portion, the second direction and the third direction are perpendicular to each other.

9. The battery cell according to claim 8, characterized in that, The electrode assembly includes two second sides arranged opposite to each other along the second direction; The second insulating portion further includes a second partition portion, and each of the first partition portions is connected to the second partition portion at both ends along the second direction. The second partition portion is used to cover the second side. The thickness direction of the first insulating part, the second direction, and the third direction are perpendicular to each other.

10. The battery cell according to claim 1, characterized in that, The inner surfaces of the sidewall and the bottom wall are connected by an arc transition surface. The first insulating portion and the folded portion are configured to change the height position of the electrode assembly relative to the bottom wall to avoid the arc transition surface from squeezing the electrode assembly.

11. A battery, characterized in that, Includes the battery cell according to any one of claims 1-10.

12. An electrical appliance, characterized in that, Includes the battery according to claim 11.

13. A manufacturing apparatus for a single battery cell, characterized in that, include: A providing device is configured to provide a housing, an electrode assembly, and an insulating element, the housing including a bottom wall and side walls surrounding the bottom wall, the insulating element including a first insulating portion and a second insulating portion connected together, the first insulating portion having a through hole; An assembly apparatus is configured to cover the outer periphery of the electrode assembly with the insulating element and to place the electrode assembly within the housing, such that the first insulation separates the electrode assembly from the bottom wall and the second insulation portion separates the electrode assembly from the side wall; The insulating member further includes a plurality of folded portions, which are foldably disposed on the first insulating portion. The folded portions are configured to be stacked with the first insulating portion to cover the through hole. Along a first direction, a portion of the plurality of folded portions is located on one side of the first insulating portion, and another portion of the plurality of folded portions is located on the other side of the first insulating portion. The first direction is the thickness direction of the first insulating portion.

14. A method for manufacturing a single battery cell, characterized in that, include: A housing, an electrode assembly, and an insulating element are provided. The housing includes a bottom wall and side walls surrounding the bottom wall. The insulating element includes a first insulating portion and a second insulating portion connected together, the first insulating portion having a through hole. The insulating component is wrapped around the outer periphery of the electrode assembly; The electrode assembly is disposed within the housing such that the first insulating portion separates the electrode assembly from the bottom wall and the second insulating portion separates the electrode assembly from the side wall; The insulating member further includes a plurality of folded portions, which are foldably disposed on the first insulating portion. The folded portions are configured to be stacked with the first insulating portion to cover the through hole. Along a first direction, a portion of the plurality of folded portions is located on one side of the first insulating portion, and another portion of the plurality of folded portions is located on the other side of the first insulating portion. The first direction is the thickness direction of the first insulating portion.

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