Battery cell, battery, and electric device

Abstract

The application is suitable for the technical field of batteries, and provides a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, an electrode assembly, an insulation structure and a separation structure. The shell has an inner cavity, and the shell has a first wall. The electrode assembly is arranged in the inner cavity. The separation structure and the insulation structure are both arranged between the electrode assembly and the first wall. One of the insulation structure and the separation structure is provided with at least two first through holes, and the other one is respectively provided with a second through hole corresponding to each first through hole. The second through hole comprises a locating hole. The cross-sectional area of the locating hole is greater than that of the corresponding first through hole, or the cross-sectional area of the locating hole is greater than that of the other second through hole. Since the battery monomer provided by the application is provided with the locating hole, at least two positioning pins can be inserted between the insulation structure and the separation structure for positioning, and the positioning effect is better.

Description

[0001] This application claims priority to Chinese patent application filed on August 1, 2023, with application number 202322048883.0 and entitled "Battery Cell, Battery and Electrical Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery, and an electrical device. Background Technology

[0003] During battery production, the insulation and isolation structures need to be positioned to facilitate their subsequent connection.

[0004] In related technologies, multiple through holes are provided on the insulation structure and the isolation structure respectively. The through holes on the insulation structure and the through holes on the isolation structure correspond one-to-one. Multiple positioning structures pass through the through holes of the insulation structure and the isolation structure in sequence to achieve positioning.

[0005] However, in the process of locating insulation and isolation structures, it is difficult to achieve the positioning of insulation and isolation structures through more than one positioning structure, resulting in positioning difficulties. Summary of the Invention

[0006] The purpose of this application is to provide a battery cell, a battery, and an electrical device, aiming to solve the technical problem of difficult positioning of insulation and isolation structures in the prior art.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0008] In a first aspect, a battery cell is provided, comprising:

[0009] The outer shell has an inner cavity and a first wall;

[0010] Electrode assembly, located within the cavity;

[0011] An insulating structure, at least a portion of which is located between the electrode assembly and the first wall;

[0012] An isolation structure is provided between the electrode assembly and the first wall;

[0013] One of the insulation structure and the isolation structure is provided with at least two first through holes, and the other is provided with a second through hole for each first through hole. In the direction parallel to the first wall, the cross-sectional area of ​​the second through hole is greater than or equal to the cross-sectional area of ​​the first through hole it is provided with, and at least one alignment hole is included among the multiple second through holes.

[0014] The cross-sectional area of ​​the alignment hole is greater than the cross-sectional area of ​​the first through hole corresponding to it, or the cross-sectional area of ​​the alignment hole is greater than the cross-sectional area of ​​any other second through hole.

[0015] In the manufacturing process of this type of battery cell, the insulation and isolation structures are positioned using positioning structures. The positioning structures first extend into a first through-hole, and then into a second through-hole opposite to the first. Since multiple positioning structures are typically of the same shape and size, the cross-sectional area of ​​the alignment hole in the second through-hole is larger than the cross-sectional area of ​​its corresponding first through-hole, or the cross-sectional area of ​​the alignment hole is larger than the cross-sectional area of ​​other second through-holes. When one positioning structure is inserted into the corresponding first through-hole and the non-alignment hole, the insulation and isolation structures are positioned relative to each other to a certain extent. Because the cross-sectional area of ​​the alignment hole is relatively larger, even if there is a certain deviation in the distance between the alignment hole and the adjacent second through-hole, a portion of the alignment hole can still correspond to the first through-hole. Therefore, at least one other positioning structure can be inserted into the first through-hole and then into the alignment hole, allowing the insulation and isolation structures to be positioned using at least two alignment pins, resulting in better positioning.

[0016] In some embodiments, the second through hole includes at least one alignment hole and one positioning hole. The cross-sectional area of ​​the alignment hole is larger than that of the positioning hole, the cross-sectional area of ​​the positioning hole is equal to that of the corresponding first through hole, and the shape of the positioning hole is the same as that of the corresponding first through hole.

[0017] In this configuration, the positioning hole serves as a reference for positioning. That is, during the positioning process, the positioning structure is first inserted into the first through hole corresponding to the positioning hole, and then inserted into the positioning hole. Since the cross-sectional area of ​​the positioning hole and the first through hole are equal, the positioning hole and its corresponding first through hole have a better limiting effect on the positioning structure.

[0018] In some embodiments, the cross-sectional area of ​​the first through hole corresponding to the alignment hole is equal to the cross-sectional area of ​​the alignment hole, and the shape of the first through hole corresponding to the alignment hole is the same as the shape of the alignment hole.

[0019] In this configuration, since the shape and cross-sectional area of ​​the first through hole are the same as the shape and cross-sectional area of ​​the corresponding second through hole, it is convenient to process and manufacture the first through hole and the second through hole.

[0020] In some embodiments, at least one second through hole and its corresponding first through hole are both circular holes, and the diameters of the two circular holes are equal.

[0021] In this configuration, the round hole is easy to manufacture, and it provides a better limiting effect for the cylindrical positioning structure.

[0022] In some embodiments, the diameter of the circular hole is 1mm-20mm.

[0023] In this setup, a more suitable size of the circular hole can be selected based on the size of the first wall to achieve a better positioning effect.

[0024] In some embodiments, the diameter of the circular hole is 2.5mm-7mm.

[0025] In this configuration, the size of the circular hole can be set according to the size of the positioning structure commonly used in related technologies.

[0026] In some embodiments, in a first direction, the size of the alignment hole is larger than the size of the corresponding first through hole, or the size of the alignment hole is larger than the size of other second through holes, and the first direction is parallel to the length direction of the first wall.

[0027] In this configuration, the alignment hole can reduce the impact of dimensional errors in the insulation and isolation structures in the first direction on the positioning effect.

[0028] In some embodiments, a plurality of first through holes are spaced apart in a first direction.

[0029] In this configuration, the alignment hole can reduce the impact of dimensional errors in the insulation and isolation structures in the first direction on the positioning effect.

[0030] In some embodiments, in the second direction, the size of the first through hole and the size of the corresponding second through hole are equal, and the second direction is parallel to the width direction of the first wall.

[0031] In this configuration, the first and second through holes provide better limiting effect for the positioning structure, thereby improving the positioning effect of the insulation and isolation structures in the second direction.

[0032] In some embodiments, the first through hole has a first inner wall and a second inner wall distributed along a first direction, the alignment hole has a third inner wall and a fourth inner wall distributed along the first direction, and a fifth inner wall and a sixth inner wall distributed along a second direction, the first inner wall and the third inner wall have the same shape, the second inner wall and the third inner wall have the same shape, and the fifth inner wall and the sixth inner wall are parallel to the first direction respectively.

[0033] In this configuration, the positioning structure can contact a larger area with the third and fourth inner walls, resulting in better positioning and more effective use of the inner wall of the alignment hole to limit the positioning structure.

[0034] In some embodiments, at least one first through hole is a circular hole, and the first inner wall, second inner wall, third inner wall, and fourth inner wall are all arc-shaped inner wall surfaces; or,

[0035] At least one first through hole is a rectangular hole, the alignment hole is a rectangular hole, and the first inner wall is parallel to the third inner wall, and the second inner wall is parallel to the fourth inner wall; or,

[0036] At least one first through hole is a triangular hole, the alignment hole is a trapezoidal hole, and the first inner wall is parallel to the third inner wall, and the second inner wall is parallel to the fourth inner wall.

[0037] In this configuration, for positioning structures of different shapes, a first through hole of different shapes can be selected, and a second through hole of different shapes can be selected to improve the relative limiting effect between the first through hole, the second through hole and the positioning structure.

[0038] In some embodiments, in the first direction, the difference between the size of the alignment hole and the size of the opposite first through hole is greater than 0 mm and less than or equal to 3 mm; or,

[0039] In the first direction, the difference between the size of the alignment hole and the size of the other second through hole is greater than 0 mm and less than or equal to 3 mm.

[0040] In this configuration, the alignment hole and its corresponding first through hole provide better limiting effect for the positioning structure, thereby improving the positioning effect of the insulation structure and the isolation structure in the first direction.

[0041] In some embodiments, in the first direction, the difference between the size of the alignment hole and the size of the first through hole is greater than or equal to 0 mm and less than or equal to 0.5 mm; or,

[0042] In the first direction, the difference between the size of the alignment hole and the size of the other second through hole is greater than or equal to 0 mm and less than or equal to 0.5 mm.

[0043] In this configuration, the alignment hole and its corresponding first through hole provide better limiting effect for the positioning structure, thereby improving the positioning effect of the insulation structure and the isolation structure in the first direction.

[0044] In some embodiments, in the second direction, the first through hole is located in the central region of the insulating or insulating structure, and the second direction is parallel to the width direction of the first wall.

[0045] In this configuration, after the positioning structure is inserted, it is located in the middle area of ​​the insulation and isolation structures, resulting in better positioning.

[0046] In some embodiments, in the second direction, the dimension of the first wall is W1, and the distance between the first through hole and the side wall of the housing is W2, then:

[0047] |W2-W1 / 2|≤5mm.

[0048] In this configuration, after the positioning structure is inserted, it is located in the middle area of ​​the insulation and isolation structures, and the distance between it and the two long sides of the insulation and isolation structures is similar, resulting in a better positioning effect.

[0049] In some embodiments, in the second direction, the distance between the first through hole and the sidewalls on both sides of the housing is equal.

[0050] In this configuration, after the positioning structure is inserted, it is located on the centerline of the insulation structure and the isolation structure in the width direction, resulting in better positioning and further reducing the relative torsion between the insulation structure and the isolation structure.

[0051] In some embodiments, a plurality of first through holes are symmetrically distributed in pairs with respect to the center line of the length direction of the first wall, the center distance between two symmetrical first through holes is C1, and the length of the first wall is L, then C1 = (L-10mm, L-60mm).

[0052] In this configuration, the first through hole is located on the insulating or insulating structure. Taking the first through hole as an example, there is a certain distance between the first through hole and the two short sides of the insulating structure, which makes the structural strength of the area on the insulating structure between the first through hole and the short sides relatively greater.

[0053] In some embodiments, the isolation structure is disposed between the insulating structure and the first wall, the first through hole is disposed in the isolation structure, and the second through hole is disposed in the insulating structure.

[0054] In this configuration, the insulating structure is positioned closer to the electrode assembly, while the isolation structure is located between the insulating structure and the first wall, facilitating manufacturing and processing.

[0055] In some embodiments, the isolation structure includes a plate body, the plate body includes a first surface disposed perpendicular to the thickness direction of the plate body, a first through hole is disposed through the plate body along the thickness direction of the plate body, and a support block is disposed on the first surface, the support block being disposed in the area of ​​the first surface where the first through hole is not disposed.

[0056] In this configuration, the support blocks improve the structural strength of the plate body.

[0057] In some embodiments, the isolation structure includes a plate body and a support block. The plate body includes a first surface disposed along the thickness direction of the plate body, a first through hole disposed through the plate body along the thickness direction of the plate body, a support block disposed on the first surface, and a third through hole disposed on the support block along the thickness direction of the support block. The third through hole is disposed corresponding to the first through hole and communicates with the first through hole.

[0058] In this configuration, the third through hole is provided for the positioning structure to pass through, so that the support block and the plate body can be positioned by the positioning structure.

[0059] In some embodiments, the cross-sectional area of ​​the third through hole is greater than or equal to the cross-sectional area of ​​the first through hole.

[0060] In this configuration, the third through hole does not obstruct the first through hole, making it easy for the positioning structure to pass through.

[0061] In some embodiments, there are multiple support blocks, each of which is provided with a third through hole. The multiple third through holes have the same shape and the same size.

[0062] In this configuration, the arrangement of multiple support blocks creates fluid channels in the isolation structure, allowing airflow between the first wall and the electrode assembly, thereby improving airflow performance between them. The identical structure of the multiple support blocks facilitates manufacturing on the same production line.

[0063] In some embodiments, the cross-sectional area of ​​each third through hole is equal to the cross-sectional area of ​​the alignment hole.

[0064] Since the alignment hole is relatively larger, the cross-sectional area of ​​the third through hole is equal to that of the alignment hole, which means that the third through hole does not obstruct the first through hole or the second through hole.

[0065] In some embodiments, at least one edge of the support block is flush with at least one edge of the plate body.

[0066] In this configuration, the positioning between the support block and the plate body can be achieved through edge positioning.

[0067] In some embodiments, the first wall is provided with a pressure relief structure, the first through hole and the pressure relief structure are spaced apart in the length direction of the first wall, and the second through hole and the pressure relief structure are spaced apart in the length direction of the first wall.

[0068] In this configuration, both the first through hole and the second through hole are located relatively far from the pressure relief structure, thereby reducing the contact between the anode powder discharged through the first or second through hole and the pressure relief structure.

[0069] In some embodiments, the isolation structure is provided with a fourth through hole, the cross-sectional area of ​​which is smaller than the cross-sectional area of ​​any of the first through holes.

[0070] In this configuration, the isolation structure is made lighter by incorporating a fourth through hole, thereby reducing the overall weight of the battery cell.

[0071] In some embodiments, the isolation structure has only two holes, the insulation structure has only two holes, and the two holes in one of the isolation structure and the insulation structure are both first through holes, while the two holes in the other are both second through holes.

[0072] In this configuration, since no other holes are provided on the isolation structure and the insulation structure except for the first through hole and the second through hole, the amount of anode powder that moves between the isolation structure and the first wall can be reduced.

[0073] In some embodiments, the insulating structure includes an insulating film comprising a first portion and a second portion, the first portion being located between the electrode assembly and the first wall, the second portion being connected to the first portion, and the second portion being annular and wrapping around the outer periphery of the electrode assembly.

[0074] In this configuration, the insulating film covers a larger area of ​​the electrode assembly, resulting in better insulation.

[0075] Secondly, a battery is provided, comprising the battery cell provided by the above-mentioned technical solution.

[0076] Since the battery includes the aforementioned battery cells, it possesses at least all the beneficial effects of the aforementioned battery cells, which will not be elaborated upon here.

[0077] Thirdly, an electrical device is provided, which includes the battery provided by the above-mentioned technical solution, and the battery is used to provide electrical energy.

[0078] Since the electrical device includes the aforementioned battery, it possesses at least all the beneficial effects of the aforementioned battery, which will not be elaborated upon here. Attached Figure Description

[0079] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0080] Figure 1 This is a schematic diagram of the structure of an electrical device provided in one embodiment of this application;

[0081] Figure 2 This is a schematic diagram of the battery structure provided in one embodiment of this application;

[0082] Figure 3 This is an exploded view of a battery cell provided in the first embodiment of this application;

[0083] Figure 4 yes Figure 3 Exploded view of the structural components of the insulation and isolation structures in a single battery cell;

[0084] Figure 5 This is an exploded view of a portion of the structure of a battery cell provided in the second embodiment of this application;

[0085] Figure 6 yes Figure 3 A schematic diagram showing the relative position of the second through hole in a single battery cell to the outer casing;

[0086] Figure 7 This is a schematic diagram showing the relative positions of the first through hole and the second through hole in a battery cell provided in the third embodiment of this application;

[0087] Figure 8 yes Figure 3 A schematic diagram showing the relative positions of the insulation and isolation structures in a single battery cell;

[0088] Figure 9 yes Figure 3 A schematic diagram showing the unfolded insulation structure of a single battery cell.

[0089] Figure 10 This is a schematic diagram showing the relative positions of the first through hole and the second through hole in a battery cell provided in the fourth embodiment of this application;

[0090] Figure 11 This is a schematic diagram showing the relative position of the first through hole and the first wall in a battery cell provided in the fifth embodiment of this application;

[0091] Figure 12 This is a schematic diagram showing the relative positions of the first through hole and the second through hole in a battery cell provided in the sixth embodiment of this application;

[0092] Figure 13 This is a schematic diagram showing the relative positions of the first through hole and the second through hole in a battery cell provided in the seventh embodiment of this application;

[0093] Figure 14 This is a schematic diagram showing the relative positions of the first through hole and the second through hole in a battery cell provided in the eighth embodiment of this application;

[0094] Figure 15 This is an exploded view of the structural components of the insulation and isolation structures in the battery cell provided in the ninth embodiment of this application;

[0095] Figure 16 yes Figure 15 A schematic diagram of the unfolded insulation structure in the diagram;

[0096] Figure 17 yes Figure 15 A schematic diagram showing the relative position of the first through hole and the first wall in a single battery cell;

[0097] Figure 18 This is an exploded view of a portion of the structure of a battery cell provided in the tenth embodiment of this application;

[0098] Figure 19 yes Figure 18 Exploded view of the components in the central isolation structure;

[0099] Figure 20 yes Figure 19 Assembly drawing of the central isolation structure;

[0100] Figure 21 yes Figure 20 A magnified view of a section at point A in the middle;

[0101] Figure 22 This is a schematic diagram showing the relative position of the first through hole and the first wall in a battery cell provided in the eleventh embodiment of this application.

[0102] The details of the reference numerals used in the above figures are as follows:

[0103] 1. Electrical appliances;

[0104] 10. Battery; 20. Control mechanism; 30. Drive mechanism;

[0105] 100. Battery cell; 200. Housing;

[0106] 101. Top cover patch; 102. Top cover; 103. Adapter plate; 104. Protective film;

[0107] 110. Outer shell; 111. First wall;

[0108] 120. Electrode assembly; 121. Battery cell body; 122. Tab;

[0109] 130. Insulating structure; 131. First part; 132. Second part; 132a. First sub-film layer; 132b. Second sub-film layer;

[0110] 140. Isolation structure; 141. Plate body; 1411. Fourth through hole; 142. Support block; 1421. Third through hole;

[0111] 150. First through hole; 151. First inner wall; 152. Second inner wall;

[0112] 160. Second through hole; 161. Alignment hole; 162. Positioning hole; 163. Third inner wall; 164. Fourth inner wall; 165. Fifth inner wall; 166. Sixth inner wall;

[0113] 170. Pressure relief structure. Detailed Implementation

[0114] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0115] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0116] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0117] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 battery cell 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.

[0118] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "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 specified.

[0119] In this embodiment, the battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment is not limited to these types.

[0120] The battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0121] A single battery cell includes a casing and an electrode assembly. The casing includes a housing and an end cap assembly. The housing has an opening, and the end cap assembly covers the opening of the housing to form an inner cavity with the housing. The housing can be made of steel, aluminum, plastic, composite metal, or aluminum-plastic film, etc.

[0122] The electrode assembly is installed within the inner cavity. The electrode assembly includes a battery cell body with tabs on it, including a positive tab and a negative tab. The end cap assembly includes a top cap and a top cap patch, with the top cap patch located on the side of the top cap away from the housing. Terminals are mounted on the top cap, with electrode terminals including a positive terminal and a negative terminal. The positive tab connects to the positive terminal, and the negative tab connects to the negative terminal. The tabs and electrode terminals are connected via adapter pieces. These adapter pieces prevent damage to the battery or burnout of other components in the event of a short circuit or overcharging / overdischarging of the electrode assembly, thus ensuring safe battery use.

[0123] An insulation structure and an isolation structure are set between the main body of the battery cell and the casing, and a protective film is attached to the outside of the casing.

[0124] In related designs, to facilitate the alignment of the bottom cover plate and the insulation structure and to enable subsequent connection, multiple through holes are typically provided on both the bottom cover plate and the insulation structure. The through holes on the bottom cover plate and the insulation structure have the same shape and size, and are interconnected. When aligning the bottom cover plate and the insulation structure, an auxiliary alignment structure is used. This structure has multiple positioning structures (e.g., positioning pins). The cross-sectional shape of these positioning structures matches the number, shape, and size of the through holes on the bottom cover plate. Each positioning structure is aligned with a corresponding through hole, passing through both the corresponding through hole on the bottom cover plate and the through hole on the insulation structure. This multiple positioning structure positions the bottom cover plate and the insulation structure at multiple points, thus achieving proper alignment.

[0125] However, due to manufacturing errors, the distance between adjacent through holes on the bottom cover may differ from the distance between two adjacent through holes on the insulation structure. In other words, if one through hole on the bottom cover is aligned with one through hole on the insulation structure, the other adjacent through hole on the bottom cover cannot be aligned with the other adjacent through hole on the insulation structure. Consequently, the positioning structure cannot pass through the other adjacent through hole on the bottom cover and cannot be aligned with the other adjacent through hole on the insulation structure. This makes it difficult to position the insulation structure and the bottom cover using more than one positioning structure, affecting the alignment effect between the bottom cover and the insulation structure.

[0126] Based on the above considerations, a battery cell is designed to solve the aforementioned problems. The battery cell includes a casing, electrode components, an insulating structure, and an isolation structure. The casing has a first wall. One of the insulating and isolation structures has a first through-hole, and the other has a second through-hole. There are multiple first and second through-holes, arranged in a one-to-one correspondence. At least one of the multiple second through-holes includes a aligning hole, the cross-sectional area of ​​which is larger than the cross-sectional area of ​​the corresponding first through-hole, or the cross-sectional area of ​​the aligning hole is larger than the cross-sectional area of ​​any other second through-hole. In this battery cell, the positioning structure first extends into the first through-hole, and then extends into the second through-hole opposite to the first through-hole. Since multiple positioning structures are typically of the same shape and size, when the cross-sectional area of ​​the alignment hole in the second through hole is larger than the cross-sectional area of ​​its corresponding first through hole, the insulation and isolation structures are positioned to a certain extent after one positioning structure is inserted into the corresponding positioning hole of the first through hole and the non-alignment hole. Because the cross-sectional area of ​​the alignment hole is relatively larger, even if there is a certain deviation in the distance between the alignment hole and the adjacent second through hole, a portion of the alignment hole can still correspond to the first through hole. Therefore, at least one other positioning structure can be inserted into the first through hole and then into the alignment hole, allowing the insulation and isolation structures to be positioned using at least two alignment pins, resulting in better positioning. When the cross-sectional area of ​​the alignment hole is larger than the cross-sectional area of ​​other second through holes, even if there is a certain deviation in the distance between the alignment hole and the adjacent second through hole, there is at least a partially corresponding area between the alignment hole and the first through hole for the positioning structure to insert. That is, when one positioning structure is inserted into the corresponding positioning hole of the first through hole and the non-alignment hole, at least one other positioning structure can be inserted into the first through hole and then into the alignment hole, allowing the insulation and isolation structures to be positioned using at least two alignment pins, resulting in better positioning.

[0127] The battery cell provided in this embodiment can be used as a battery, and the battery can be used in electrical devices, including but not limited to: mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle 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.

[0128] Please see Figure 1 and Figure 2For ease of description, this example uses a vehicle as the electrical device 1. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or extended-range electric vehicles, etc. The vehicle's interior can house a drive mechanism 30, a control mechanism 20, and a battery 10. The drive mechanism 30 can be a motor, etc., and the control mechanism 20 controls the battery 10 to supply power to the drive mechanism 30. For example, the battery 10 can be located at the bottom, front, or rear of the vehicle. The battery 10 can be used to power other equipment in the vehicle. For example, the battery 10 can serve as the vehicle's operating power source for the vehicle's electrical system, such as for the power needs of starting, navigation, and operation. In another example, the battery 10 can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing gasoline or natural gas to provide driving force. The vehicle in this example uses the aforementioned battery 10. By improving the reliability of the battery 10, the reliability of the electrical device 1 can be improved.

[0129] Please see Figures 3 to 5 This embodiment provides a battery cell 100, including a housing 110, an electrode assembly 120, an insulating structure 130, and an isolation structure 140. The housing 110 has an inner cavity and a first wall 111. The electrode assembly 120 is disposed in the inner cavity. At least a portion of the insulating structure 130 is located between the electrode assembly 120 and the first wall 111. The isolation structure 140 is disposed between the electrode assembly 120 and the first wall 111. One of the insulating structure 130 and the isolation structure 140 is provided with at least two first through holes 150, and the other... A second through hole 160 is provided for each first through hole 150; the first through hole 150 and the second through hole 160 are provided in a one-to-one correspondence. In the direction parallel to the first wall 111, the cross-sectional area of ​​each second through hole 160 is greater than or equal to the cross-sectional area of ​​the first through hole 150 corresponding to it; at least one alignment hole 161 is included among the multiple second through holes 160. The cross-sectional area of ​​the alignment hole 161 is greater than the cross-sectional area of ​​the first through hole 150 corresponding to it, or the cross-sectional area of ​​the alignment hole 161 is greater than the cross-sectional area of ​​any other second through hole 160.

[0130] The outer casing 110 forms the outer casing structure of the battery cell 100. The outer casing 110 is at least partially hollow to form an inner cavity. The outer casing 110 has a first wall 111, which is one of the wall surfaces of the outer casing 110. The first wall 111 can be at least one of the bottom wall, top wall, or side wall of the outer casing 110.

[0131] In this embodiment, the length direction of the battery cell 100 is the X direction, the width direction is the Y direction, and the height direction is the Z direction.

[0132] In some examples, the housing 110 includes a housing and an end cap assembly. A protective film 104 is affixed to the outside of the housing. The housing has an opening, and the end cap assembly closes onto the opening of the housing to form an inner cavity. The housing can be a steel housing, an aluminum housing, a plastic housing, a composite metal housing, or an aluminum-plastic film, etc. The first wall 111 can be located on the housing or on the end cap assembly. The electrode assembly 120 is installed in the inner cavity. The electrode assembly 120 can be a wound structure or a stacked structure. The electrode assembly 120 can be inserted into the inner cavity through the opening of the housing. The electrode assembly 120 includes a cell body 121, on which tabs 122 are provided. The tabs 122 include a positive tab and a negative tab. The end cap assembly includes a top cover 102 and a top cover patch 101, with the top cover patch 101 located on the side of the top cover 102 away from the housing. Electrode terminals are mounted on the top cover 102, including a positive terminal and a negative terminal. The positive tab is connected to the positive terminal, and the negative tab is connected to the negative terminal. The tab 122 is connected to the electrode terminals via an adapter piece 103. The adapter piece 103 is used to prevent damage to the battery 10 or burnout of other components in the event of a short circuit or overcharging / overdischarging of the electrode assembly 120, thereby ensuring the safe use of the battery 10.

[0133] An isolation structure 140 is installed in the inner cavity and is at least partially located between the electrode assembly 120 and the first wall 111. An insulating structure 130 is used to isolate the electrode assembly 120 and the housing 110, reducing contact between the electrode assembly 120 and the housing 110. The isolation structure 140 is used to create a barrier between the first wall 111 and the electrode assembly 120, so that the electrode assembly 120 cannot contact the first wall 111.

[0134] like Figure 3 As shown, in one feasible embodiment, the isolation structure 140 is located between the insulating structure 130 and the first wall 111. Figure 5 As shown, in another feasible embodiment, the isolation structure 140 is located on the side of the insulating structure 130 away from the first wall 111, that is, the isolation structure 140 is located between the insulating structure 130 and the electrode assembly 120.

[0135] In one mode of operation, when positioning the isolation structure 140 and the insulation structure 130, the positioning structure first passes through the isolation structure 140 and then through the insulation structure 130. In this mode, as... Figure 4 As shown, the isolation structure 140 is provided with a first through hole 150, and the insulating structure 130 is provided with a second through hole 160. In another mode of operation, the positioning structure passes through the insulating structure 130 first and then through the isolation structure 140. In this mode, as shown... Figure 5As shown, the insulating structure 130 is provided with a first through hole 150, and the isolation structure 140 is provided with a second through hole 160. That is to say, according to the operation flow of positioning the isolation structure 140 and the insulating structure 130, the structure through which the positioning structure passes first is provided with the first through hole 150, and the structure through which the positioning structure passes second is provided with the second through hole 160.

[0136] For ease of description, the following text will use the example of the isolation structure 140 having a first through hole 150 and the insulation structure 130 having a second through hole 160 for further explanation.

[0137] The number of first through holes 150 and second through holes 160 is the same. If the number of first through holes 150 is at least two, then the number of second through holes 160 is also at least two.

[0138] Multiple first through holes 150 are spaced apart, and each of the multiple first through holes 150 corresponds to a multiple of second through holes 160. The correspondence between the first through holes 150 and the second through holes 160 can be such that the first through holes 150 and the second through holes 160 are completely opposite each other, or that all of the first through holes 150 is opposite to a portion of the second through holes 160.

[0139] The cross-sectional areas of the first through hole 150 and the second through hole 160 are both in a direction parallel to the first wall 111. Since the cross-sectional area of ​​the second through hole 160 is equal to or greater than the cross-sectional area of ​​the first through hole 150, when the cross-sectional areas of the second through hole 160 and the first through hole 150 are equal, the projection of the second through hole 160 onto the first wall 111 coincides with that of its corresponding first through hole 150; that is, the second through hole 160 is completely opposite to its corresponding first through hole 150. When the cross-sectional area of ​​the second through hole 160 is greater than that of its corresponding first through hole 150, the projection of its corresponding first through hole 150 onto the first wall 111 is completely within the range of the projection of the second through hole 160 onto the first wall 111; that is, the entire first through hole 150 is opposite a portion of the second through hole 160.

[0140] Part or all of the second through hole 160 is referred to as the alignment hole 161. The alignment hole 161 is a hole in the second through hole 160 whose cross-sectional area is greater than the cross-sectional area of ​​the first through hole 150 corresponding to it, or a hole whose cross-sectional area is greater than the cross-sectional area of ​​any other second through hole 160.

[0141] For example, if there is a second through hole 160 with a cross-sectional area larger than the first through hole 150 opposite to the second through hole 160, then such a second through hole 160 is referred to as an alignment hole 161. Among the plurality of second through holes 160, all of the second through holes 160 may be alignment holes 161, or some of the second through holes 160 may be alignment holes 161, while some of the second through holes 160 may not be alignment holes 161.

[0142] If the cross-sectional areas of the multiple second through holes 160 are not equal, one or more second through holes 160 with a cross-sectional area larger than the other second through holes 160 are referred to as alignment holes 161. The cross-sectional area of ​​the alignment hole 161 can be larger than or equal to the cross-sectional area of ​​its corresponding first through hole 150. In this case, among the multiple second through holes 160, some second through holes 160 are alignment holes 161, and some second through holes 160 are not alignment holes 161. To facilitate the distinction between alignment holes 161 and other second through holes 160, all other second through holes 160 besides alignment holes 161 are referred to as positioning holes 162.

[0143] In the plurality of second through holes 160, the number of alignment holes 161 can be one or more, and the number of positioning holes 162 can be one or more, or no positioning holes 162 may be provided. For example, the number of first through holes 150 is two, and the number of second through holes 160 is two. In the two second through holes 160, such as... Figure 6 As shown, one is a positioning hole 162, and the other is an alignment hole 161, or, as... Figure 7 As shown, both second through holes 160 are alignment holes 161. In another example, there are three first through holes 150 and three second through holes 160. Among the three second through holes 160, when there is one alignment hole 161, there are two positioning holes 162; when there are two alignment holes 161, there is one positioning hole 162; and when there are three alignment holes 161, there are no positioning holes 162.

[0144] During the positioning process of the insulation structure 130 and the isolation structure 140, the positioning structure first passes through the first through hole 150 and then through the second through hole 160 corresponding to the first through hole 150. Since at least one alignment hole 161 is in the second through hole 160, even if the cross-sectional area of ​​the alignment hole 161 is larger than the cross-sectional area of ​​the corresponding first through hole 150, even if the distance between the alignment hole 161 and its adjacent second through hole 160 is not centered relative to each other due to manufacturing errors, the alignment hole 161 can still be aligned with all the first through holes 150 within a certain deviation range. That is, after passing through the first through hole 150, the positioning structure can still extend into the alignment hole 161, thereby achieving positioning of the insulation structure 130 and the isolation structure 140 through at least two positioning structures, resulting in a better positioning effect.

[0145] When the cross-sectional area of ​​the alignment hole 161 is larger than the cross-sectional area of ​​the other second through holes 160, the second through holes 160 include both the alignment hole 161 and the positioning hole 162, with the cross-sectional area of ​​the alignment hole 161 being larger than that of the positioning hole 162. Since the cross-sectional area of ​​the positioning hole 162 is larger than or equal to the cross-sectional area of ​​the corresponding first through hole 150, and the first through hole 150 allows the positioning structure to pass through, both the positioning hole 162 and the alignment hole 161 can be used for the insertion of the positioning structure. Because the cross-sectional area of ​​the alignment hole 161 is larger than that of the positioning hole 162, the cross-sectional area of ​​the alignment hole 161 must be larger than that of the positioning structure. After the positioning structure passes through the first through hole 150 opposite to the alignment hole 161, the positioning structure can extend into the alignment hole 161 within a certain deviation range. That is, at least two positioning structures are used to position the insulating structure 130 and the insulating structure 140, resulting in a better positioning effect.

[0146] As can be seen from the above, since the second through hole 160 is provided with an alignment hole 161, even if there is a manufacturing error in the distance between the alignment hole 161 and its adjacent second through hole 160, or in the distance between two adjacent first through holes 150, it can still be guaranteed that at least two positioning structures can be inserted between the insulating structure 130 and the isolation structure 140, so as to position the insulating structure 130 and the isolation structure 140 through the two positioning structures, and the positioning effect is better.

[0147] It is worth noting that, since the positioning structure first passes through the first through hole 150 and then extends into the second through hole 160, the diameter of the smallest concentric circle projected onto the first wall 111 by the second through hole 160 is greater than or equal to the diameter of the smallest concentric circle projected onto the first wall 111 by the first through hole 150. In other words, the projection of the second through hole 160 onto the first wall 111 can at least completely cover the outer periphery of the projection of the first through hole 150 onto the first wall 111. Furthermore, since the cross-sectional area of ​​the second through hole 160 is larger than that of the relative first through hole 150, the positioning structure that can pass through the first through hole 150 can move within a certain range in one or more directions within the second through hole 160. This allows the first through hole 150 to still be aligned with a portion of the second through hole 160 even if there is a manufacturing error in the first through hole 150, meaning that the positioning structure can still pass through the second through hole 160 after passing through the first through hole 150.

[0148] In some embodiments, such as Figure 8As shown, the isolation structure 140 has a center line P1 in the length direction, which is parallel to the width direction of the isolation structure 140. At least one first through hole 150 is provided on each side of the center line P1. This arrangement divides the isolation structure 140 into two regions with relatively similar or equal areas in the length direction. Both regions are provided with the first through hole 150, allowing a positioning structure to be inserted for better positioning during the positioning process.

[0149] In some embodiments, such as Figure 5 As shown, the insulating structure 130 includes an insulating film comprising a first portion 131 and a second portion 132. The first portion 131 is located between the electrode assembly 120 and the first wall 111. The second portion 132 is connected to the first portion 131 and is annular, wrapping around the outer periphery of the electrode assembly 120. When the electrode assembly 120 is cylindrical, the second portion 132 is annular; when the electrode assembly 120 is prismatic (e.g., cubic), the second portion is prismatically annular. Figure 5 As shown, the electrode assembly 120 has a cuboid structure with four sides around its perimeter. The second part 132 is a square ring structure formed by the four sides. The four sides of the second part 132 are respectively attached to the four sides around the electrode assembly 120.

[0150] Exemplarily, the electrode assembly 120 has two opposing ends, one end having a tab 122, and the other end facing the first wall 111. On the outer surface of the electrode assembly 120, one or more side surfaces connecting the opposing ends form the circumferential surface of the electrode assembly 120, i.e., the circumferential side surfaces of the electrode assembly 120. A second portion 132 wraps around the circumferential side surfaces of the electrode assembly 120. The second portion 132 wrapping around the outer periphery of the electrode assembly 120 includes the second portion 132 completely covering the circumferential side surfaces of the electrode assembly 120, and also includes the second portion 132 covering a portion of the circumferential side surfaces of the electrode assembly 120.

[0151] For example, such as Figure 3 and Figure 5As shown, the second portion 132 of the insulating film covers at least a portion of the circumferential side of the cell assembly, and the first portion 131 of the insulating film covers the side of the cell body 121 facing the first wall 111. The insulating film may include multiple film layer structures, with different film layer structures covering different sides of the cell body 121. The insulating films covering adjacent sides may have overlapping areas or may not have overlapping areas and may be simply connected. The film layer located between the electrode assembly 120 and the first wall 111 is the first portion 131, while several other film layer structures surrounding the circumference of the electrode assembly 120 constitute the second portion 132. The second portion 132 may be formed by a single annular film layer structure or by connecting multiple film layer structures. The first portion 131 and the second portion 132 may be separate structures, connected during assembly, or, as... Figure 9 As shown, the insulating film is a single sheet of film, that is, the first part 131 and the second part 12 are an integral structure. After being folded, it covers multiple sides of the battery cell body 121. The part located between the battery cell body 121 and the first wall 111 is the first part 131, and the part surrounding and covering the outside of the battery cell body 121 is the second part 132. Figure 9 The dotted line in the middle represents the fold mark; the structure formed after folding can be referenced. Figure 3 and Figure 5 The shape of the middle insulation structure 130. Figure 9 In the first part 131, a rectangle is formed. A first sub-film layer 132a and a second sub-film layer 132b are respectively disposed on opposite sides of the first part 131. After folding, the opposite sides of the first sub-film layer 132a and the second sub-film layer 132b are connected, thereby forming a rectangular ring structure, which is also the second part 132. The first sub-film layer 132a and the second sub-film layer 132b can be bonded together.

[0152] In some embodiments, the cross-sectional area of ​​at least one second through hole 160 is equal to the cross-sectional area of ​​its corresponding first through hole 150. The second through hole 160 with the same cross-sectional area as the first through hole 150 can be an alignment hole 161 or a positioning hole 162.

[0153] For example, such as Figure 10 As shown, there are two first through holes 150, and the two first through holes 150 have the same shape and equal cross-sectional area. There are two second through holes 160, one of which is an alignment hole 161 and the other is a positioning hole 162. The cross-sectional area of ​​the alignment hole 161 is larger than that of the first through hole 150, and the cross-sectional area of ​​the positioning hole 162 is equal to that of the first through hole 150. Figure 10From the perspective of [the viewpoint], the positioning hole 162 coincides with the first through hole 150, and the shape of the positioning hole 162 is the same as the shape of the first through hole 150. In this arrangement, the second through hole 160, which has the same cross-sectional area as the first through hole 150, is the positioning hole 162. Since the cross-sectional area of ​​the positioning hole 162 is equal to that of the first through hole 150, the positioning hole 162 can be used as the positioning reference hole. That is, during the positioning process, the positioning reference hole is first made to correspond completely with the first through hole 150. The positioning structure passing through the first through hole 150 is inserted into the corresponding positioning reference hole. The insulating structure 130 and the isolation structure 140 achieve a relatively good positioning effect in all directions parallel to the first wall 111 by inserting the positioning structure into the positioning hole 162 and the first through hole 150. Then, another positioning structure passes through another first through hole 150 and extends into the alignment hole 161, which can prevent the insulating structure 130 and the isolation structure 140 from rotating around the axis of the first through hole 150 to a certain extent, thereby achieving a better positioning effect.

[0154] In another example, such as Figure 4 As shown, there are two first through holes 150, with different cross-sectional areas. The first through hole 150 with a smaller cross-sectional area is positioned opposite the positioning hole 162, and the positioning hole 162 has the same cross-sectional area as the opposite first through hole 150. The first through hole 150 with a larger cross-sectional area is positioned opposite the alignment hole 161, and the alignment hole 161 has the same cross-sectional area as the opposite first through hole 150. In this arrangement, the alignment hole 161 and the positioning hole 162 have the same cross-sectional area as their respective first through holes 150. The positioning structure inserted into the positioning hole 162 and the corresponding first through hole 150 plays a role in the initial positioning of the insulating structure 130 and the isolation structure 140. The cross-sectional areas of the alignment hole 161 and the corresponding first through hole 150 are both larger than the cross-section of the positioning structure. Therefore, even if there is a large error in the distance between the alignment hole 161 and the positioning hole 162, or a large error in the two first through holes 150, the relative area between the alignment hole 161 and its corresponding first through hole 150 can still be used for the insertion of the positioning structure.

[0155] In some examples, such as Figure 4 As shown, the second through hole 160 includes at least one alignment hole 161 and one positioning hole 162. The cross-sectional area of ​​the alignment hole 161 is larger than the cross-sectional area of ​​the positioning hole 162. The cross-sectional area of ​​the positioning hole 162 is equal to the cross-sectional area of ​​the corresponding first through hole 150, and the shape of the positioning hole 162 is the same as the shape of the corresponding first through hole 150.

[0156] In this example, there are several different configurations. In one configuration, the two first through holes 150 have the same shape and cross-sectional area. The positioning hole 162 has the same shape and cross-sectional area as its opposite first through hole 150, and the alignment hole 161 has a larger cross-sectional area than its opposite first through hole 150. In another configuration, the two first through holes 150 have different cross-sectional areas, and their shapes can be the same or different. The first through hole 150 with the smaller cross-sectional area has the same cross-sectional area and shape as the positioning hole 162, while the first through hole 150 with the larger cross-sectional area has the same cross-sectional area and shape as the alignment hole 161. In yet another configuration, the two first through holes 150 have different cross-sectional areas, and their shapes can be the same or different. The first through hole 150 with a smaller cross-sectional area is provided corresponding to the positioning hole 162. The positioning hole 162 and its corresponding first through hole 150 have the same cross-sectional area and the same shape. The first through hole 150 with a larger cross-sectional area is provided corresponding to the alignment hole 161. The cross-sectional area of ​​the alignment hole 161 is larger than that of the first through hole 150 with a larger cross-sectional area.

[0157] In this configuration, the positioning hole 162 serves as a reference for positioning. That is, during the positioning process, the positioning structure is first inserted into the first through hole 150 corresponding to the positioning hole 162, and then inserted into the positioning hole 162. Since the positioning hole 162 and the first through hole 150 have the same cross-sectional area and shape, the positioning structure and the positioning hole 162 are matched when the dimensions of the positioning structure and the first through hole 150 are matched. In other words, the isolation structure 140 provides a good limiting effect for the positioning structure through the first through hole 150, and the insulation structure 130 provides a good limiting effect for the positioning structure through the positioning hole 162.

[0158] In some embodiments, the cross-sectional area of ​​the first through hole 150 corresponding to the alignment hole 161 is equal to the cross-sectional area of ​​the alignment hole 161, and the shape of the first through hole 150 corresponding to the alignment hole 161 is the same as the shape of the alignment hole 161.

[0159] In this example, the cross-sectional area of ​​the alignment hole 161 is larger than that of the positioning hole 162. The alignment hole 161 has the same shape and cross-sectional area as its corresponding first through hole 150, while the positioning hole 162 has the same shape and cross-sectional area as another first through hole 150. Therefore, the cross-sectional areas of the two first through holes 150 are not the same, and the cross-sectional area of ​​one first through hole 150 is larger than that of the other first through hole 150.

[0160] Since the first through hole 150 and the positioning hole 162 have the same cross-sectional area and the same shape, the first through hole 150 and the positioning hole 162 can be drilled using the same drilling equipment or the same drilling process. Since the other first through hole 150 and the alignment hole 161 have the same cross-sectional area and the same shape, the first through hole 150 and the alignment hole 161 can be drilled using the same drilling equipment or the same drilling process, which facilitates manufacturing and improves manufacturing efficiency.

[0161] The cross-sectional shape of the first through hole 150 provided in this embodiment can be circular, elliptical, polygonal, trapezoidal or other shapes. In some embodiments, the cross-sectional shape of the first through hole 150 matches the cross-sectional shape of the positioning structure. For example, if the cross-sectional shape of the positioning structure is circular, then the first through hole 150 is a circular hole; if the cross-sectional shape of the positioning structure is rectangular, then the first through hole 150 is a square hole, and the cross-sectional shape of the square hole is a rectangle that matches the cross-sectional shape of the positioning structure.

[0162] In some embodiments, such as Figure 4 , Figure 6 and Figure 10 As shown, at least one second through hole 160 and its corresponding first through hole 150 are both round holes, and the diameters of the two round holes are equal.

[0163] To position the insulation structure 130 and the isolation structure 140 within the battery cell 100, a cylindrical positioning structure can be used. This cylindrical positioning structure can be entirely cylindrical, or its ends can be frustum-shaped or conical. Both the first through hole 150 and the second through hole 160 are circular holes. Firstly, since the positioning structure is typically cylindrical, it is convenient to use a universal positioning structure for positioning, eliminating the need for custom mold production and saving costs. Secondly, the manufacturing process for circular holes is more mature and efficient. Thirdly, when the positioning structure is inserted into the circular hole, the inner wall of the hole surrounds the periphery of the positioning structure, providing a relatively better limiting effect for the positioning structure in any circumferential direction.

[0164] For example, there are two first through holes 150, both of which are circular holes with unequal diameters. There are also two second through holes 160, including a positioning hole 162 and an alignment hole 161. Both the positioning hole 162 and the alignment hole 161 are circular holes. The positioning hole 162 has the same diameter as the smaller first through hole 150 and is correspondingly positioned thereto. The alignment hole 161 has the same diameter as the larger first through hole 150 and is correspondingly positioned thereto. In other words, the diameters of both second through holes 160 are equal to the diameters of their corresponding first through holes 150. When positioning the insulation structure 130 and the isolation structure 140 of the battery cell 100, the outer diameter of the positioning structure is matched with the diameter of the smaller diameter first through hole 150. That is, the outer diameter of the positioning structure is smaller than the diameter of the other first through hole 150 and the alignment hole 161. This ensures that after the positioning hole 162 is fully aligned with the smaller diameter first through hole 150, even if the other first through hole 150 and the alignment hole 161 are misaligned within a certain range in any direction parallel to the first wall 111, the area opposite the alignment hole 161 and the first through hole 150 can still be used for the positioning structure to be inserted.

[0165] In another example, there are two first through holes 150, both of which are circular holes with equal diameters. There are also two second through holes 160, including a positioning hole 162 and an alignment hole 161. Both the positioning hole 162 and the alignment hole 161 are circular holes. The diameter of the positioning hole 162 is equal to the diameter of the first through hole 150, while the diameter of the alignment hole 161 is larger than the diameter of the first through hole 150. That is, of the two second through holes 160, one second through hole 160 (the positioning hole 162) has the same diameter as the first through hole 150 and is circular.

[0166] In another example, as shown in Figure 4, there are two first through holes 150. One of the first through holes 150 is a circular hole, and the other is a non-circular hole with a cross-sectional area larger than that of the circular hole. There are also two second through holes 160, including a positioning hole 162 and an alignment hole 161. The positioning hole 162 is a circular hole with a diameter equal to that of the first through hole 150. The alignment hole 161 has the same shape as the non-circular first through hole 150, and its cross-sectional area is equal to that of the non-circular first through hole 150. That is to say, of the two second through holes 160, one second through hole 160 (positioning hole 162) has a diameter equal to that of the first through hole 150 and is a circular hole.

[0167] The diameter of the circular hole can be designed according to the diameter of the positioning structure or according to the dimensions of the first wall 111, which includes the length and width of the first wall 111. If the dimensions of the first wall 111 are large, a relatively large circular hole can be provided to increase the contact area between the circular hole and the positioning structure and improve positioning stability.

[0168] For example, the length L of the first wall 111 is 5 mm to 1000 mm, and the width W1 is 5 mm to 1000 mm. In some embodiments, the diameter D1 of the circular hole is 1 mm to 20 mm. For example, the diameter D1 of the circular hole can be 1 mm, 2 mm, 3 mm, 5 mm, 6 mm, 8 mm, 12 mm, 15 mm, 17 mm, or 18 mm. It is worth noting that the diameter D1 of the circular hole is smaller than the length of the first wall 111 and smaller than the width of the first wall 111. Within this range, the insulating structure 130 and the isolation structure 140 are positioned by the cooperation of the circular hole and the positioning structure. The inner wall of the circular hole contacts the outer wall of the positioning structure, thereby limiting the relative positioning of the insulating structure 130, the isolation structure 140, and the positioning structure through the cooperation of the circular hole and the positioning structure, resulting in a better positioning effect.

[0169] In some examples, the diameter D1 of the circular hole is 2.5mm-7mm. Exemplarily, the diameter D1 of the circular hole can be 2.5mm, 2.8mm, 3mm, 3.2mm, 4mm, 4.5mm, 5mm, 6mm, 6.5mm, 6.8mm, or 7mm. Within this range, the contact area between the inner wall of the circular hole and the outer wall of the positioning structure is relatively larger, resulting in better positioning stability. Furthermore, a circular hole of this size facilitates the insertion of the positioning structure, simplifying the positioning operation and improving positioning efficiency.

[0170] In some embodiments, the first wall 111 is the bottom wall of the shell, and the length direction of the first wall 111 is the X direction and the width direction is the Y direction.

[0171] The alignment hole 161 may have a dimension larger than the first through hole 150 or larger than the dimension of any other second through hole 160 in at least one direction parallel to the first wall 111. For example, as shown... Figure 6As shown, in some embodiments, in the first direction, the size of the alignment hole 161 is larger than the size of its corresponding first through hole 150, or the size of the alignment hole 161 is larger than the size of other second through holes 160. The first direction is parallel to the length direction of the first wall 111, that is, the first direction is the X direction. With this configuration, during the alignment process, the size of the alignment hole 161 in the first direction is larger, that is, its size in the X direction is relatively larger. This allows for a certain range of deviation between the alignment hole 161 and its corresponding first through hole 150 in the first direction, while still allowing the positioning structure to be inserted into the first through hole 150 and its corresponding alignment hole 161. Since manufacturing errors in the first direction often lead to difficulties in inserting the positioning structure during actual production, making the size of the alignment hole 161 larger in the first direction can, to some extent, solve the alignment difficulty problem.

[0172] In this embodiment, a plurality of first through holes 150 are spaced apart in any direction parallel to the first wall 111. For example, as shown below... Figure 11 As shown, there are two first through holes 150. The line connecting the center points of the two first through holes 150 is inclined relative to the center line P2 of the first wall 111 in the width direction. That is, taking the first wall 111 as a rectangle, including two opposite long sides and two opposite short sides, one first through hole 150 is located close to one long side, and the other first through hole 150 is located close to the other long side, so that the line connecting the center points of the two first through holes 150 is inclined relative to the center line of the first wall 111 in the width direction. The first through hole 150 being located close to one long side means that in the width direction (Y direction) of the first wall 111, the distance between the first through hole 150 and one of the long sides is less than the distance between the first through hole 150 and the other long side.

[0173] In some examples, such as Figure 8As shown, multiple first through holes 150 are spaced apart in a first direction. In this arrangement, the multiple first through holes 150 are spaced apart along the length of the first wall 111, and the line connecting the center points of two first through holes 150 is parallel to the center line P2 of the first wall 111 in the width direction. This allows multiple positioning structures to be spaced apart between the insulating structure 130 and the isolation structure 140 along the length of the first wall 111 during positioning, resulting in better positioning of the insulating structure 130 and the isolation structure 140 in the first direction. Since the dimensions of the insulating structure 130 and the isolation structure 140 in the first direction are relatively larger than their dimensions in the second direction, the positioning effect is relatively better. Furthermore, since the first direction is the length of the first wall 111, which is the same as the length of the side wall of the insulating structure 130 and the length of the isolation structure 140, after inserting multiple positioning structures between the insulating structure 130 and the isolation structure 140, the line connecting the multiple positioning structures is parallel to the long edge of the insulating structure 130 and the long edge of the isolation structure 140, facilitating operation during positioning.

[0174] In some embodiments, such as Figure 8 As shown, there are two first through holes 150, each located on the isolation structure 140. The isolation structure 140 has a center line P1 along its length, which is parallel to its width. The two first through holes 150 are located on either side of the center line along the length of the isolation structure 140, and are spaced apart along a first direction. This arrangement divides the isolation structure 140 into two regions with relatively similar or equal areas along its length. Both regions are provided with first through holes 150. During positioning, a positioning structure can be inserted for better positioning.

[0175] In some examples, such as Figure 10 As shown, in the second direction, the size of the first through hole 150 and the size of its corresponding second through hole 160 are equal, and the second direction is parallel to the width direction of the first wall 111. That is to say, in the Y direction, the size of the first through hole 150 and the size of its corresponding second through hole 160 are equal. Since the size of the alignment hole 161 is relatively larger in the X direction, while in the Y direction the size of the alignment hole 161 is equal to the size of the first through hole 150, the alignment hole 161 provides a better limiting effect for the positioning structure in the Y direction, and in the X direction, it allows the positioning structure to be inserted even if there is an error. In this arrangement, through the cooperation of the first through hole 150, the second through hole 160 and the positioning structure, the positioning effect of the insulating structure 130 and the isolation structure 140 in the Y direction is better and the positioning stability is higher.

[0176] In some examples, such as Figures 12 to 14 As shown, the first through hole 150 has a first inner wall 151 and a second inner wall 152 distributed along a first direction, and the alignment hole 161 has a third inner wall 163 and a fourth inner wall 164 distributed along the first direction, and a fifth inner wall 165 and a sixth inner wall 166 distributed along a second direction. The first inner wall 151 and the third inner wall 163 have the same shape, the second inner wall 152 and the third inner wall 163 have the same shape, and the fifth inner wall 165 and the sixth inner wall 166 are parallel to the first direction. In this arrangement, the positioning structure that can extend into the first through hole 150 can move within the alignment hole 161 along the first direction within the size range of the shorter of the fifth inner wall 165 and the sixth inner wall 166. That is, in the first direction, when the manufacturing offset of the first through hole 150 or the second through hole 160 is within the size range of the shorter of the fifth inner wall 165 and the sixth inner wall 166, the positioning structure can be inserted into the second through hole 160. Since the first inner wall 151 and the third inner wall 163 have the same shape, and the second inner wall 152 and the fourth inner wall 164 have the same shape, the positioning structure can contact the third inner wall 163 and the fourth inner wall 164 in a larger area, resulting in a better positioning effect and more effective use of the inner wall of the alignment hole 161 to limit the positioning structure.

[0177] For example, such as Figure 12 As shown, when at least one first through hole 150 is a circular hole, the alignment hole 161 is a runway hole. The first inner wall 151 and the second inner wall 152 of the first through hole 150 are both semi-circular, that is, the first inner wall 151 and the second inner wall 152 are both arc-shaped inner wall surfaces. The runway hole is that the third inner wall 163 and the fourth inner wall 164 are both arc-shaped surfaces, while the fifth inner wall 165 and the sixth inner wall 166 are both flat holes. The first inner wall 151 and the third inner wall 163 have the same shape and the same size, that is, the third inner wall 163 is also an arc-shaped hole, and the diameter of the first inner wall 151 is equal to the diameter of the third inner wall 163; the second inner wall 152 and the fourth inner wall 164 have the same shape and the same size, that is, the fourth inner wall 164 is also an arc-shaped hole, and the diameter of the second inner wall 152 is equal to the diameter of the fourth inner wall 164. The fifth inner wall 165 and the sixth inner wall 166 are parallel to each other, and their lengths are equal in the first direction. With this configuration, the positioning pin can be a cylindrical structure, the dimensions of which match the dimensions of the first through hole 150 of the circular hole. This positioning structure can extend into the runway hole and move within it in the first direction. That is, in the first direction, if the manufacturing offset of the first through hole 150 or the second through hole 160 is within the size range of the fifth inner wall 165, the positioning structure can be inserted into the second through hole 160.

[0178] In another example, such as Figure 13 As shown, at least one first through hole 150 is a rectangular hole, and the alignment hole 161 is a rectangular hole. The first inner wall 151 is parallel to the third inner wall 163, and the second inner wall 152 is parallel to the fourth inner wall 164. Exemplarily, in a first direction, the size of the alignment hole 161 is larger than the size of the rectangular hole in the first through hole 150, and in a second direction, the size of the alignment hole 161 is equal to the size of the first through hole 150. Figure 13 As shown, in the first direction, the size of the first through hole 150 is D1, and the size of the alignment hole 161 is D2. If the preset position of the first through hole 150 is that the center of the first through hole 150 coincides with the center of the second through hole 160, that is, in the first direction, the distances between the two sides of the first through hole 150 and the second through hole 160 are equal, then if the manufacturing error of the first through hole 150 is within the range of (D2-D1) / 2, the first through hole 150 is still partially positioned opposite to the second through hole 160, so that the positioning structure passing through the first through hole 150 can pass through the second through hole 160. This arrangement is suitable for positioning using a positioning structure with a rectangular cross-section.

[0179] In yet another example, such as Figure 14 As shown, at least one first through hole 150 is a triangular hole, the alignment hole 161 is a trapezoidal hole, and the first inner wall 151 is parallel to the third inner wall 163, and the second inner wall 152 is parallel to the fourth inner wall 164. Figure 14 As shown, in the first direction, the maximum side length of the first through hole 150 is D1, and the maximum side length of the alignment hole 161 is D2. If the preset position of the first through hole 150 is that the center of the first through hole 150 coincides with the center of the second through hole 160, that is, in the first direction, the distances between the two sides of the first through hole 150 and the second through hole 160 are equal, then if the manufacturing error of the first through hole 150 is within the range of (D2-D1) / 2, the first through hole 150 is still partially positioned opposite to the second through hole 160, so that the positioning structure passing through the first through hole 150 can pass through the second through hole 160. This arrangement is suitable for positioning using a positioning structure with a triangular cross-section.

[0180] In this configuration, for positioning structures of different shapes, a first through hole 150 of different shapes can be selected, and a second through hole 160 of different shapes can be selected to improve the relative limiting effect between the first through hole 150, the second through hole 160 and the positioning structure.

[0181] In some embodiments, in the first direction, the difference between the size of the alignment hole 161 and the size of the opposite first through hole 150 is greater than 0 mm and less than or equal to 3 mm; or, in the first direction, the difference between the size of the alignment hole 161 and the size of the other second through hole 160 is greater than 0 mm and less than or equal to 3 mm.

[0182] In one configuration, in a first direction, the size of the alignment hole 161 is larger than the size of the first through hole 150. In this configuration, the difference between the size of the alignment hole 161 and the size of the corresponding first through hole 150 is greater than 0 mm and less than or equal to 3 mm. Figures 12 to 14 As shown, the size of the alignment hole 161 is larger than the size of the first through hole 150. The size of the alignment hole 161 is D2, and the size of the first through hole 150 is D1. 0mm < D2 - D1 ≤ 3mm. In this configuration, the maximum deviation of the first through hole 150 in the first direction is 3mm. The positioning structure can pass through the first through hole 150 and then through the alignment hole 161 corresponding to the first through hole 150.

[0183] In this configuration, since the size difference between the alignment hole 161 and its corresponding first through hole 150 is within 3mm, the size difference between the alignment hole 161 and the positioning structure is relatively small. This makes the positioning hole 161 and its corresponding first through hole 150 have a better limiting effect on the positioning structure, which can improve the positioning effect of the insulating structure 130 and the isolation structure 140 in the first direction.

[0184] In some embodiments, in the first direction, the difference between the size of the alignment hole 161 and the size of the first through hole 150 is greater than or equal to 0 mm and less than or equal to 0.5 mm; or, in the first direction, the difference between the size of the alignment hole 161 and the size of the other second through hole 160 is greater than or equal to 0 mm and less than or equal to 0.5 mm. Figures 12 to 14As shown, the size of the alignment hole 161 is larger than the size of the first through hole 150. The size of the alignment hole 161 is D2, and the size of the first through hole 150 is D1, where 0mm < D2 - D1 ≤ 0.5mm. In this configuration, the maximum deviation of the first through hole 150 in the first direction is 0.5mm. The positioning structure can pass through the first through hole 150 and then through the alignment hole 161 corresponding to it. Since drilling equipment has a certain precision, the drilling deviation is usually not too large. Therefore, the size of the alignment hole 161 and the first through hole 150 can be set according to the precision standard of the drilling equipment. In this example, the difference between the size of the alignment hole 161 and the size of the other second through hole 160 is relatively small. That is, the minimum size of the alignment hole 161 is set while meeting the precision standard of the drilling equipment, so that the size of the alignment hole 161 is relatively smaller while meeting the alignment requirements, thereby reducing the amount of anode powder entering the alignment hole 161.

[0185] In some embodiments, such as Figure 8 , Figure 15 , Figure 16 and Figure 17 As shown, in the second direction (Y direction), the first through hole 150 is located in the middle region of the insulating structure 130 or the isolation structure 140, and the second direction is parallel to the width direction of the first wall 111.

[0186] Since the second through hole 160 corresponds to the first through hole 150, the second through hole 160 is also provided in the middle region of the insulating structure 130 or the isolation structure 140. Taking the example of the second through hole 160 provided on the insulating structure 130 and the first through hole 150 provided on the isolation structure 140, in the second direction, the first through hole 150 is provided in the middle region of the isolation structure 140, and the second through hole 160 is provided in the middle region of the insulating structure 130.

[0187] The isolation structure 140 has two side edges that are spaced apart in a second direction, and the first through hole 150 is disposed in the middle region of the isolation structure 140. That is, there is a gap between the first through hole 150 and the two side edges of the isolation structure 140, and the gap distance is similar or equal.

[0188] The insulating structure 130 has two side edges that are spaced apart in a second direction, and the second through hole 160 is disposed in the middle region of the insulating structure 130. That is, there is a gap between the second through hole 160 and the two side edges of the insulating structure 130, and the gap distance is similar or equal.

[0189] After the positioning structure is inserted into the isolation structure 140 and the insulation structure 130, the distance between the positioning structure and the two side edges of the isolation structure 140 distributed in the second direction is similar, which reduces the relative sway between the isolation structure 140 and the insulation structure 130 and improves the positioning effect. In other words, in this configuration, after the positioning structure is inserted, it is located in the middle region of the insulation structure 130 and the isolation structure 140, resulting in a better positioning effect.

[0190] In some embodiments, such as Figure 17 As shown, in the second direction, the dimension of the first wall 111 is W1, and the distance between the first through hole 150 and the side wall of the outer casing 110 is W2. Then:

[0191] |W2-W1 / 2|≤5mm.

[0192] exist Figure 17 In this context, |W2-W1 / 2| = n, and 0mm ≤ n ≤ 5mm. For example, n can be 0mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, or 5mm, etc. The distance between the first through hole 150 and the side wall of the outer casing 110 is specifically the distance between the midpoint of the first through hole 150 in the second direction and the side wall of the outer casing 110. When the first through hole 150 is a circular hole, it is the distance between the center of the first through hole 150 and the side wall of the outer casing 110. 0mm ≤ n ≤ 5mm means that the distance between the first through hole 150 and the centerline P2 of the first wall 111 in the second direction is within a range of no more than 5mm, which means that the first through hole 150 is located closer to the centerline P2 of the first wall 111 in the second direction. With this configuration, the first through hole 150 is closer to the center line P2, while the second through hole 160 is positioned opposite to it, also closer to the center line P2. The distance between the midpoint of the second through hole 160 and the center line P2 of the first wall 111 in the second direction is no more than 5 mm. After inserting the positioning structure, the difference in distance between the positioning structure and the two side edges of the isolation structure 140 in the second direction is less than 5 mm. This reduces the relative sway between the isolation structure 140 and the insulation structure 130, improving the positioning effect. In other words, in this configuration, after inserting the positioning structure, it is located in the middle of the insulation structure 130 and the isolation structure 140, resulting in a better positioning effect.

[0193] like Figure 8As shown, in the second direction, the distance between the first through hole 150 and the side walls on both sides of the housing 110 is equal. The outer side has two side walls spaced apart in the second direction, and the distance between the first through hole 150 and one of the side walls is equal to the distance between the first through hole 150 and the other side wall. That is to say, the center of the first through hole 150 is located on the center line P2 of the first wall 111 in the second direction.

[0194] Since the second through hole 160 is positioned opposite to the first through hole 150, the center of the second through hole 160 is also located on the center line P2 of the first wall 111 in the second direction.

[0195] In this configuration, after the positioning structure is inserted, the central axis of the positioning structure is located on the center line P2 of the insulating structure 130 and the isolation structure 140 in the second direction, resulting in better positioning and further reducing the relative torsion between the insulating structure 130 and the isolation structure 140.

[0196] In some embodiments, such as Figure 8 As shown, multiple first through holes 150 are symmetrically distributed in pairs with respect to the center line P1 of the length direction of the first wall 111. The center distance between two symmetrical first through holes 150 is C1, and the length of the first wall 111 is L. Then C1 = (L-10mm, L-60mm), and the first direction is the length direction parallel to the first wall 111.

[0197] The center of the first through hole 150 is a point equidistant from both sides of the first through hole 150 in a first direction. For example, if the first through hole 150 is a circular hole, then the center of the first through hole 150 is the center of the circle. If the first through hole 150 is a rectangular hole, then the center of the first through hole 150 is the intersection of its two diagonals. In two symmetrically distributed first through holes 150, the distance between the centers of the two first through holes 150 is the center-to-center distance C1 between the two first through holes 150.

[0198] C1 = (L-10mm, L-60mm), that is, C1 is less than L, and 10mm < L-C1 < 60mm. Therefore, the distance between the center of the first through hole 150 and the side wall of the outer shell 110 adjacent to the first through hole 150 is greater than 5mm and less than 30mm.

[0199] In this configuration, there is a certain distance between the first through hole 150 and the two side walls of the outer casing 110 that are spaced apart along the first direction. The distance between the first through hole 150 and the adjacent side wall is greater than 5 mm and less than 30 mm. The dimensions of the insulating structure 130 and the isolation structure 140 in the first direction are similar to the dimensions of the first wall 111 in the first direction. This makes the structural strength of the area between the first through hole 150 and the side wall of the outer casing 110 relatively greater in the insulating structure 130 and / or the isolation structure 140 where the first through hole 150 is opened.

[0200] In some embodiments, the isolation structure 140 is disposed between the insulating structure 130 and the first wall 111, the first through hole 150 is disposed in the isolation structure 140, and the second through hole 160 is disposed in the insulating structure 130.

[0201] At least a portion of the insulating structure 130 is located between the electrode assembly 120 and the isolation structure 140, which is located between the cell assembly and the first wall 111, and also between the insulating structure 130 and the first wall 111. A first through hole 150 is provided on the isolation structure 140, and a second through hole 160 is provided on the insulating structure 130. That is, during the positioning of the insulating structure 130 and the isolation structure 140, the positioning structure first passes through the first through hole 150 on the isolation structure 140, and then passes through the second through hole 160 on the insulating structure 130.

[0202] In this configuration, the insulating structure 130 is positioned closer to the electrode assembly 120, and the isolation structure 140 is located between the insulating structure 130 and the first wall 111, facilitating manufacturing. Exemplarily, the insulating structure 130 includes an insulating film that forms a covering cavity. The battery cell assembly is at least partially located within the covering cavity, meaning the insulating film covers at least a portion of the outer side of the battery cell assembly. The isolation structure 140 is located outside the covering cavity of the insulating structure 130, allowing the positioning structure to pass through the isolation structure 140 first and then through the insulating structure 130. The length of the positioning structure extending beyond the insulating film to the side away from the isolation structure 140 is relatively short, or it may not extend beyond the side of the insulating film away from the isolation structure 140 at all, thus achieving the positioning of the insulating film and the isolation structure 140, facilitating operation.

[0203] In some embodiments, such as Figure 18 As shown, the isolation structure 140 includes a plate body 141. The plate body 141 includes a first surface that is perpendicular to the thickness direction of the plate body 141. A first through hole 150 is disposed through the plate body 141 along the thickness direction of the plate body 141. A support block 142 is disposed on the first surface. The support block 142 is disposed in the area of ​​the first surface where the first through hole 150 is not disposed.

[0204] Since the first surface is perpendicular to the thickness direction of the plate body 141, the first surface is located on the side of the plate body 141 facing the first wall 111, or on the side of the plate body 141 away from the first wall 111.

[0205] The support block 142 improves the structural strength of the plate body 141. Since the support block 142 is located in the area of ​​the first surface where the first through hole 150 is not provided, the support block 142 will not block the first through hole 150, that is, the setting of the support block 142 will not affect the positioning between the plate body 141 and the insulating structure 130.

[0206] like Figure 18 , Figure 19 and Figure 20 As shown, in some other embodiments, the isolation structure 140 includes a plate body 141 and a support block 142. The plate body 141 includes a first surface disposed along the thickness direction of the plate body 141. A first through hole 150 is disposed through the plate body 141 along the thickness direction of the plate body 141. The first surface is provided with a support block 142. A third through hole 1421 is disposed on the support block 142 along the thickness direction of the support block 142. The third through hole 1421 is correspondingly disposed with the first through hole 150 and communicates with the first through hole 150.

[0207] The support block 142 has a third through hole 1421 extending along the Z direction. The third through hole 1421 can communicate with the first through hole 150. That is to say, when the support block 142 is installed in the area of ​​the plate body 141 where the first through hole 150 is provided, the third through hole 1421 on the support block 142 communicates with the first through hole 150 so that the positioning structure can pass through.

[0208] In this configuration, the third through hole 1421 is provided for the positioning structure to pass through. On one hand, since the support block 142 has the third through hole 1421, the positioning structure can pass through the third through hole 1421 and extend into the first through hole 150. That is, the support block 142 does not obstruct the first through hole 150, allowing the insulating structure 130 and the isolation structure 140 to still be positioned by the positioning structure. On the other hand, since the positioning structure passes through the third through hole 1421 and extends into the first through hole 150, the plate body 141 and the support block 142 can be positioned by the positioning structure.

[0209] In some embodiments, the cross-sectional area of ​​the third through hole 1421 is greater than or equal to the cross-sectional area of ​​the first through hole 150. Since the cross-sectional area of ​​the third through hole 1421 is greater than or equal to the cross-sectional area of ​​the first through hole 150, and the positioning structure can pass through the first through hole 150, when the third through hole 1421 and the first through hole 150 are opposite to each other and connected, the positioning structure can pass through the third through hole 1421 and then extend into the first through hole 150. That is, the third through hole 1421 does not obstruct the first through hole 150, making it convenient for the positioning structure to pass through.

[0210] In some embodiments, there are multiple support blocks 142, each of which is provided with a third through hole 1421. The multiple third through holes 1421 have the same shape and the same size.

[0211] When the number of support blocks 142 is equal to the number of first through holes 150, one support block 142 can be provided for each first through hole 150. The first through hole 150 is opposite to and connected to the third through hole 1421 on the opposite support block 142. Alternatively, some first through holes 150 are provided with support blocks 142, while other first through holes 150 are not provided with support blocks 142. The other support blocks 142 are provided in the area of ​​the plate body 141 where no first through holes 150 are provided.

[0212] When the number of support blocks 142 is greater than the number of first through holes 150, a number of support blocks 142 can be placed in the area of ​​the plate body 141 where the first through holes 150 are provided, while another number of support blocks 142 can be placed in the area of ​​the plate body 141 where the first through holes 150 are not provided. For example, as shown... Figure 19 As shown, the plate body 141 is provided with two first through holes 150, and the number of support blocks 142 is four, as follows. Figure 20 As shown, two support blocks 142 are respectively configured to correspond to two first through holes 150, such that the third through hole 1421 on the support block 142 is opposite to the first through hole 150. The other two support blocks 142 are configured in areas of the plate body 141 where no first through hole 150 is provided, and the third through hole 1421 on these two support blocks 142 is not opposite to the first through hole 150. In this configuration, the multiple support blocks 142 have the same structure, facilitating production on the same production line. That is, support blocks 142 with the same structure produced by the same production process can be installed either in areas opposite to the first through hole 150 or in areas of the plate body 141 where no first through hole 150 is provided.

[0213] In some embodiments, the cross-sectional area of ​​each third through hole 1421 is equal to the cross-sectional area of ​​the aligning hole 161. Since the aligning hole 161 has the largest cross-sectional area among the first through hole 150 and the second through hole 160 (i.e., its cross-sectional area is greater than or equal to the cross-sectional area of ​​the first through hole 150), and its cross-sectional area is greater than the cross-sectional area of ​​the non-aligning holes 161 in the second through hole 160, the cross-sectional area of ​​the third through hole 1421 is equal to the cross-sectional area of ​​the aligning hole 161. Therefore, the cross-sectional areas of the third through hole 1421 and the aligning hole 161 are equal. Even if the third through hole 1421 does not obstruct the first through hole 150 and the second through hole 160, that is, regardless of whether the first through hole 150 or the second through hole 160 is provided on the plate body 141, after the support block 142 is installed on the plate body 141, the third through hole 1421 is opposite to the first through hole 150 or the second through hole 160 on the plate body 141, and the third through hole 1421 does not obstruct the first through hole 150 or the second through hole 160.

[0214] In some embodiments, such as Figure 20 and Figure 21 As shown, at least one edge of the support block 142 is flush with at least one edge of the plate body 141. For example, as... Figure 20 As shown, the plate body 141 has two side edges spaced apart in the X direction, referred to as the short sides of the plate body 141. The support block 142 has two side edges spaced apart in the X direction, referred to as the short sides of the support block 142. One short side of the support block 142 is flush with one short side of the plate body 141. This flush arrangement means that in a plane constructed in the X and Y directions, or in a plane parallel to the first wall 111, at least a partial area of ​​one edge of the support block 142 overlaps with one edge of the plate body 141. In other embodiments, the long side of the support block 142 can be flush with the long side of the plate body 141. The long side of the support block 142 is the two side edges spaced apart in the Y direction, and the long side of the plate body 141 is the two side edges spaced apart in the Y direction. In this arrangement, the positioning between the support block 142 and the plate body 141 can be achieved through edge positioning. For example, during the positioning of the support block 142 and the plate body 141, a limiting structure is provided. This limiting structure has a limiting surface parallel to one side edge of the plate body 141. The one side edge of the plate body 141 is moved until it contacts the limiting surface, and then the one side edge of the support block 142 is moved until it contacts the limiting surface. This makes one side edge of the support block 142 flush with one side edge of the plate body 141, which facilitates the positioning of the plate body 141 and the support block 142, thus enabling the connection between the plate body 141 and the support block 142. The plate body 141 and the support block 142 can be joined by heat fusion. In some embodiments, the insulating structure 130 and the insulating structure 140 are joined by heat fusion.

[0215] In some embodiments, such as Figure 22 As shown, a pressure relief structure 170 is provided on the housing 110. The pressure relief structure 170 is used to release the internal pressure of the battery cell 100. As an example, it is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 100 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 100 reaches the predetermined threshold, the pressure relief structure 170 is activated or a weak structure provided in the pressure relief structure 170 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 100. The pressure relief structure 170 may be a scratch, a thinned portion, or an explosion-proof structural piece installed on the housing 110. The pressure relief structure 170 may be provided on the end cap assembly, or on the side wall or bottom wall of the housing. As an example, the pressure relief structure 170 may be integrally formed with the housing 110. As an example, the pressure relief structure 170 can also be separately installed and connected to the outer casing 110. In this example, "actuation" refers to the pressure relief structure 170 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 100. The actions of the pressure relief structure 170 may include, but are not limited to: movement of components within the pressure relief structure 170 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief structure 170, etc. When the pressure relief structure 170 is actuated, the high-temperature, high-pressure substances inside the battery cell 100 are discharged outwards from the actuated portion as emissions. This method allows for pressure and temperature relief of the battery cell 100 under controllable pressure or temperature, thereby preventing potentially more serious accidents. Emissions from the battery cell 100 include, but are not limited to: electrolyte, dissolved or broken positive and negative electrode plates, fragments of the separator, high-temperature, high-pressure gases generated by the reaction, flames, etc.

[0216] In some embodiments, the first wall 111 is provided with a pressure relief structure 170, the first through hole 150 and the pressure relief structure 170 are spaced apart in the length direction of the first wall 111, and the second through hole 160 and the pressure relief structure 170 are spaced apart in the length direction of the first wall 111.

[0217] Since the pressure relief structure 170 is disposed on the first wall 111, in the Z direction, the pressure relief structure 170 is disposed in at least a portion of the region near the insulating structure 130 and near the isolation structure 140.

[0218] The first through hole 150 and the pressure relief structure 170 are spaced apart along the length of the first wall 111. The first through hole 150 is projected onto the first wall 111. The first through hole 150 and the pressure relief structure 170 are spaced apart, that is to say, in the thickness direction (Z direction) of the first wall 111, the first through hole 150 and the pressure relief structure 170 are not opposite each other.

[0219] The second through hole 160 and the pressure relief structure 170 are spaced apart along the length of the second wall. When the second through hole 160 is projected onto the second wall, the second through hole 160 and the pressure relief structure 170 are spaced apart. That is to say, in the thickness direction (Z direction) of the second wall, the second through hole 160 and the pressure relief structure 170 are not opposite each other.

[0220] In this configuration, since the first through hole 150 and the second through hole 160 of the pressure relief structure are both located relatively far away from the pressure relief structure 170, the possibility of the anode powder falling from the battery cell body located on the other side of the isolation structure 140 and the insulation structure 130 coming into contact with the pressure relief structure 170 is reduced, thereby reducing or even avoiding corrosion of the pressure relief structure 170 to a certain extent.

[0221] like Figure 22 As shown, in the X direction, the distance between the first through hole 150 and the pressure relief structure 170 is C2. Specifically, C2 is the distance between the side of the first through hole 150 closest to the pressure relief structure 170 and the side of the pressure relief structure 170 closest to the first through hole 150. C2 is greater than 0 mm, meaning that the first through hole 150 and the pressure relief structure 170 are spaced apart. Exemplarily, C2 is greater than or equal to 20 mm. Exemplarily, C2 can be 20 mm, 22 mm, 25 mm, 28 mm, 29 mm, or 35 mm, etc. In some embodiments, C2 is greater than or equal to 30 mm. Further, C2 is less than C1 / 2. Exemplarily, C2 can be 30 mm, 32 mm, 36 mm, 38 mm, 39 mm, 40 mm, or 42 mm, etc.

[0222] In some embodiments, the isolation structure 140 is provided with a fourth through hole 1411, the cross-sectional area of ​​which is smaller than the cross-sectional area of ​​any of the first through holes 150.

[0223] The fourth through hole 1411 extends through the isolation structure 140 along its thickness direction, i.e., along the Z direction. The diameter of the fourth through hole 1411 is smaller than the diameter of any one of the first through holes 150. There can be one or more fourth through holes 1411.

[0224] In this configuration, the isolation structure 140 is made lighter by providing a fourth through hole 1411, thereby reducing the overall weight of the battery cell 100. Simultaneously, the fourth through hole 1411 allows for fluid flow between the two sides of the isolation structure 140 in the Z direction, and also allows for airflow between the first wall 111 and the electrode assembly 120, thereby improving the airflow performance between the first wall 111 and the electrode assembly 120.

[0225] In some embodiments, such as Figure 4 As shown, the isolation structure 140 has only two holes, and the insulation structure 130 has only two holes. The two holes in one of the isolation structure 140 and the insulation structure 130 are both first through holes 150, and the two holes in the other are both second through holes 160.

[0226] For example, the isolation structure 140 has only two holes, both of which are first through holes 150, while the insulation structure 130 has only two holes, both of which are second through holes 160. Alternatively, the isolation structure 140 has only two holes, both of which are second through holes 160, while the insulation structure 130 has only two holes, both of which are first through holes 150. That is to say, in this configuration, the isolation structure 140 does not have a fourth through hole 1411.

[0227] In this configuration, since no other holes are provided on the isolation structure 140 and the insulation structure 130 except for the first through hole 150 and the second through hole 160, at most two channels are formed in the insulation structure 130 and the isolation structure 140 through the first through hole 150 and the second through hole 160. This reduces the number of openings in the insulation structure 130 and the isolation structure 140, reduces the number of anode powder outflow channels, thereby reducing the amount of anode powder flowing between the electrode assembly 120 and the housing, and reducing the possibility of short circuit or housing corrosion of the battery 10.

[0228] This embodiment, based on the battery cell 100 described above, also provides an example of a battery 10. The battery 10 includes the battery cell 100 provided in any of the above embodiments.

[0229] The battery 10 can be a battery module. When there are multiple battery cells 100, the multiple battery cells 100 are arranged and fixed to form a battery module.

[0230] Battery 10 can also be a battery pack, which includes a housing 200 and battery cells 100, with the battery cells 100 or battery modules housed within the housing 200. The housing 200 provides space for the battery cells 100 or battery modules. The housing 200 can be independent of other structures of the electrical device 1, or it can be part of other structures within the electrical device 1. For example, when the electrical device 1 is a vehicle, the housing 200 can be part of the vehicle's chassis; for instance, a portion of the housing 200 can be at least a portion of the vehicle's floor, or a portion of the housing 200 can be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0231] In a battery pack, there can be multiple battery cells 100. These multiple battery cells 100 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 100 are connected in both series and parallel. Multiple battery cells 100 can be directly connected in series, parallel, or in a mixed configuration and then housed within a housing 200. Alternatively, the battery 10 can also be composed of multiple battery cells 100 first connected in series, parallel, or in a mixed configuration to form a battery module, and then these battery modules can be connected in series, parallel, or in a mixed configuration to form a whole and housed within a housing 200.

[0232] The battery 10 may also include other structures, for example, the battery 10 may also include a busbar for realizing electrical connection between multiple battery cells 100.

[0233] It is understood that in this example, the description focuses on the battery 10, which includes the aforementioned battery cell 100. The battery 10 may also include other functional components, which will not be elaborated here.

[0234] Since the battery 10 includes the battery cell 100 provided in the above embodiments, the battery 10 includes at least all the technical effects of the battery cell 100, which will not be repeated here.

[0235] This embodiment provides an electrical device 1, which includes the battery 10 in the above embodiment, and the battery 10 is used to provide electrical energy.

[0236] Since the power device 1 includes the battery 10 described above, it has at least all the beneficial effects of the battery 10 described above, which will not be repeated here.

[0237] Electrical device 1 can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0238] For ease of explanation, the following embodiments use a vehicle as an example to illustrate an electrical device 1 according to an embodiment of this application. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 10 is installed inside the vehicle, and the battery 10 can be located at the bottom, front, or rear of the vehicle. The battery 10 can be used to power the vehicle; for example, the battery 10 can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery 10 to supply power to the motor, for example, for the vehicle's starting, navigation, and driving power needs.

[0239] In some embodiments of this application, the battery 10 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0240] In one specific embodiment of this invention, a battery cell 100 is provided, comprising a housing 110, an electrode assembly 120, an insulating structure 130, and an isolation structure 140. The housing 110 has an inner cavity and a first wall 111. The housing 110 includes a shell and an end cap assembly. The shell has an opening, and the end cap assembly covers the opening of the shell to form the inner cavity. The bottom wall and side walls of the shell are also the bottom and side walls of the housing 110, and the end cap assembly forms the top wall of the housing 110. The first wall 111 is specifically the bottom wall of the shell, i.e., the first wall 111 is a wall surface in the shell opposite to the end cap assembly. The electrode assembly 120 is installed in the inner cavity. The insulating structure 130 includes an insulating film that wraps around the outer periphery of the electrode assembly 120. The isolation structure 140 includes a bottom protective plate that is installed in the inner cavity and located between the electrode assembly 120 and the first wall 111. Specifically, the isolation structure 140 is located outside the insulating film, that is, the insulating film wraps around the outside of the electrode assembly 120. A portion of the insulating film's structure faces the first wall 111, and the isolation structure 140 is located between the insulating film and the first wall 111. The isolation structure 140 has a first through-hole 150, and the insulating film has a second through-hole 160. The number of first through-holes 150 and second through-holes 160 is equal; there are two first through-holes 150 and two second through-holes 160, with each pair corresponding to the other. In the direction parallel to the first wall 111, one of the first through holes 150 has a circular cross-sectional shape, and the other has a racetrack-shaped cross-sectional shape. The cross-sectional shapes of the two second through holes 160 are the same as those of their corresponding first through holes 150, and the cross-sectional areas of the two second through holes 160 are equal to those of their corresponding first through holes 150. That is, the projections of the second through holes 160 and their corresponding first through holes 150 onto the first wall 111 coincide. In the direction parallel to the first wall 111, the second through hole 160 with a circular cross-sectional shape is a positioning hole 162, and the one with a racetrack-shaped cross-sectional shape is an alignment hole 161. In this embodiment, the two first through holes 150 are spaced apart along the X direction, and in the Y direction, the distances between the two first through holes 150 and the opposite side walls of the housing are equal.

[0241] In another specific embodiment of this invention, a battery cell 100 is provided, comprising a housing 110, an electrode assembly 120, an insulating structure 130, and an isolation structure 140. The housing 110 has an inner cavity and a first wall 111. The housing 110 includes a shell and an end cap assembly. The shell has an opening, and the end cap assembly covers the opening of the shell to form the inner cavity. The bottom wall and side walls of the shell are also the bottom wall and side walls of the housing 110, and the end cap assembly forms the top wall of the housing 110. The first wall 111 is specifically the bottom wall of the shell, that is, the first wall 111 is a wall surface in the shell opposite to the end cap assembly. The electrode assembly 120 is installed in the inner cavity. The insulating structure 130 includes an insulating film that wraps around the outer periphery of the electrode assembly 120. The isolation structure 140 includes a bottom protective plate that is installed in the inner cavity and located between the electrode assembly 120 and the first wall 111. Specifically, the isolation structure 140 is located outside the insulating film, that is, the insulating film wraps around the outside of the electrode assembly 120. A portion of the insulating film's structure faces the first wall 111, and the isolation structure 140 is located between the insulating film and the first wall 111. The isolation structure 140 has a first through-hole 150, and the insulating film has a second through-hole 160. The number of first through-holes 150 and second through-holes 160 is equal; there are two first through-holes 150 and two second through-holes 160, with each pair corresponding to the other. In the direction parallel to the first wall 111, one of the first through holes 150 has a circular cross-sectional shape, and the other has a racetrack-shaped cross-sectional shape. The cross-sectional shapes of the two second through holes 160 are the same as those of their corresponding first through holes 150, and the cross-sectional areas of the two second through holes 160 are equal to those of their corresponding first through holes 150. That is, the projections of the second through holes 160 and their corresponding first through holes 150 onto the first wall 111 coincide. In the direction parallel to the first wall 111, the second through hole 160 with a circular cross-sectional shape is a positioning hole 162, and the one with a racetrack-shaped cross-sectional shape is an alignment hole 161. In this embodiment, the two first through holes 150 are spaced apart along the X direction, and in the Y direction, the distance between the two first through holes 150 and one sidewall of the housing is less than the distance between them and the other sidewall.

[0242] In another specific embodiment of this invention, a battery cell 100 is provided, comprising a housing 110, an electrode assembly 120, an insulating structure 130, and an isolation structure 140. The housing 110 has an inner cavity and a first wall 111. The housing 110 includes a shell and an end cap assembly. The shell has an opening, and the end cap assembly covers the opening of the shell to form the inner cavity. The bottom wall and side walls of the shell are also the bottom wall and side walls of the housing 110, and the end cap assembly forms the top wall of the housing 110. The first wall 111 is specifically the bottom wall of the shell, that is, the first wall 111 is a wall surface in the shell opposite to the end cap assembly. The electrode assembly 120 is installed in the inner cavity. The insulating structure 130 includes an insulating film that wraps around the outer periphery of the electrode assembly 120. The isolation structure 140 includes a bottom protective plate that is installed in the inner cavity and located between the electrode assembly 120 and the first wall 111. Specifically, the isolation structure 140 is located outside the insulating film, that is, the insulating film wraps around the outside of the electrode assembly 120. A portion of the insulating film's structure faces the first wall 111, and the isolation structure 140 is located between the insulating film and the first wall 111. The isolation structure 140 has a first through-hole 150, and the insulating film has a second through-hole 160. The number of first through-holes 150 and second through-holes 160 is equal; there are two first through-holes 150 and two second through-holes 160, with each pair corresponding to the other. In the direction parallel to the first wall 111, one of the first through holes 150 has a circular cross-sectional shape, and the other has a racetrack-shaped cross-sectional shape. The cross-sectional shapes of the two second through holes 160 are the same as those of their corresponding first through holes 150, and the cross-sectional areas of the two second through holes 160 are equal to those of their corresponding first through holes 150. That is, the projections of the second through holes 160 and their corresponding first through holes 150 onto the first wall 111 coincide. In the direction parallel to the first wall 111, the second through hole 160 with a circular cross-sectional shape is a positioning hole 162, and the one with a racetrack-shaped cross-sectional shape is an alignment hole 161. In this embodiment, a pressure relief structure 170 is provided on the first wall 111. In the Y direction, the distance between the two first through holes 150 and one sidewall of the housing is less than the distance between them and the other sidewall. Furthermore, in the X and Z directions, two first through holes 150 are spaced apart from the pressure relief structure 170, and two second through holes 160 are spaced apart from the pressure relief structure 170.

[0243] In another specific embodiment, a fourth embodiment, a battery cell 100 is provided. The battery cell 100 includes a housing 110, an electrode assembly 120, an insulating structure 130, and an isolation structure 140. The housing 110 has an inner cavity and a first wall 111. The housing 110 includes a shell and an end cap assembly. The shell has an opening, and the end cap assembly covers the opening of the shell to form the inner cavity with the shell. The bottom wall and side wall of the shell are also the bottom wall and side wall of the housing 110. The end cap assembly forms the top wall of the housing 110. The first wall 111 is specifically the bottom wall of the shell, that is, the first wall 111 is the wall surface in the shell that is opposite to the end cap assembly. The electrode assembly 120 is installed in the inner cavity, the insulating film is wrapped around the outer periphery of the electrode assembly 120, and the isolation structure 140 is installed in the inner cavity and located between the electrode assembly 120 and the first wall 111. Specifically, the isolation structure 140 is located outside the insulating film, that is, the insulating film wraps around the outside of the electrode assembly 120. A portion of the insulating film's structure faces the first wall 111. The isolation structure 140 is located between the insulating film and the first wall 111. The isolation structure 140 includes a plate body 141, which includes a first surface arranged along the thickness direction of the plate body 141. Support blocks 142 are provided on the first surface. The plate body 141 is located between the insulating film and the first wall 111, and the support blocks 142 are located between the plate body 141 and the first wall 111. There are four support blocks 142, which are spaced apart on the first surface. The plate body 141 has two first through holes 150 extending along its thickness direction, and the insulating film has two second through holes 160. The two first through holes 150 are spaced apart along the X direction, and the two second through holes 160 correspond one-to-one with the two first through holes 150. In the direction parallel to the first wall 111, one of the first through holes 150 has a circular cross-sectional shape, and the other has a racetrack-shaped cross-sectional shape. The cross-sectional shapes of the two second through holes 160 are the same as those of their corresponding first through holes 150, and the cross-sectional areas of the two second through holes 160 are equal to those of their corresponding first through holes 150. That is, the projections of the second through holes 160 and their corresponding first through holes 150 onto the first wall 111 coincide. In the direction parallel to the first wall 111, the second through hole 160 with a circular cross-sectional shape is a positioning hole 162, and the one with a racetrack-shaped cross-sectional shape is an alignment hole 161. In the Y direction, the distance between the two first through holes 150 and one sidewall of the housing is less than the distance between them and the other sidewall. The plate body 141 is also provided with a fourth through hole 1411. There are multiple fourth through holes 1411. The multiple fourth through holes 1411 are distributed in a matrix in the middle region of the plate body 141. Along the X direction, a first through hole 150 is provided on each side of the matrix structure formed by the multiple fourth through holes 1411.Multiple fourth through holes 1411 are all circular holes, and the multiple fourth through holes 1411 are arranged with equal diameters, and the diameter of the fourth through holes 1411 is smaller than the diameter of the circular first through hole 150. Each support block 142 is provided with a third through hole 1421 along its own thickness direction, and the third through holes 1421 on each support block 142 are the same in shape and size. Two first through holes 150 are respectively provided in a one-to-one correspondence with the third through holes 1421 of two of the support blocks 142. In the direction parallel to the first wall 111, the cross-sectional area of ​​the third through hole 1421 is equal to the cross-sectional area of ​​the first through hole 150 with the largest cross-sectional area. In this embodiment, the cross-sectional area of ​​the first through hole 150 with a racetrack-shaped cross-section is the largest, therefore the cross-sectional area of ​​the third through hole 1421 is equal to the cross-sectional area of ​​the first through hole 150 with a racetrack-shaped cross-section. Since the cross-sectional area of ​​the second through hole 160 is equal to the cross-sectional area of ​​the corresponding first through hole 150, the cross-sectional area of ​​the third through hole 1421 is also equal to the cross-sectional area of ​​the second through hole 160, which has a racetrack-shaped cross-section. In other words, the cross-sectional area of ​​the third through hole 1421 is equal to the cross-sectional area of ​​the alignment hole 161. Furthermore, in this embodiment, in the direction parallel to the first wall 111, the cross-sectional shape of the third through hole 1421 is the same as the cross-sectional shape of the first through hole 150, which has a racetrack-shaped cross-section. That is, the projection of the first through hole 150, which has a racetrack-shaped cross-section, and the corresponding third through hole 1421 onto the first wall 111 coincide.

[0244] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: An outer casing having an inner cavity and a first wall; Electrode assembly, disposed in the inner cavity; An insulating structure, at least a portion of which is located between the electrode assembly and the first wall; An isolation structure is disposed between the insulating structure and the first wall. The isolation structure includes a plate body and a support block. The plate body includes a first surface disposed along the thickness direction of the plate body, and the support block is disposed on the first surface. The isolation structure is provided with at least two first through holes, which are disposed through the plate body along the thickness direction of the plate body. The insulation structure is provided with a second through hole corresponding to each of the first through holes. The support block is provided with a third through hole along the thickness direction of the support block. The third through hole is provided corresponding to the first through hole and is connected to the first through hole. In the direction parallel to the first wall, the cross-sectional area of ​​the second through hole is greater than or equal to the cross-sectional area of ​​the first through hole corresponding to it. At least one alignment hole is included among the multiple second through holes. The cross-sectional area of ​​the alignment hole is greater than the cross-sectional area of ​​the first through hole corresponding to it, or the cross-sectional area of ​​the alignment hole is greater than the cross-sectional area of ​​any other second through hole.

2. The battery cell as described in claim 1, characterized in that, The second through hole includes at least one alignment hole and one positioning hole. The cross-sectional area of ​​the alignment hole is larger than that of the positioning hole. The cross-sectional area of ​​the positioning hole is equal to that of the corresponding first through hole, and the shape of the positioning hole is the same as that of the corresponding first through hole.

3. The battery cell as described in claim 2, characterized in that, The cross-sectional area of ​​the first through hole corresponding to the alignment hole is equal to the cross-sectional area of ​​the alignment hole, and the shape of the first through hole corresponding to the alignment hole is the same as the shape of the alignment hole.

4. The battery cell as described in claim 3, characterized in that, At least one of the second through holes and its corresponding first through hole are both circular holes, and the diameters of the two circular holes are equal.

5. The battery cell as described in claim 4, characterized in that, The diameter of the circular hole is 1mm-20mm.

6. The battery cell as described in claim 5, characterized in that, The diameter of the circular hole is 2.5mm-7mm.

7. The battery cell according to any one of claims 1 to 6, characterized in that, In a first direction, the size of the alignment hole is larger than the size of the corresponding first through hole, or the size of the alignment hole is larger than the size of other second through holes, and the first direction is parallel to the length direction of the first wall.

8. The battery cell as described in claim 7, characterized in that, Multiple first through holes are spaced apart in the first direction.

9. The battery cell as described in claim 7, characterized in that, In the second direction, the size of the first through hole and the size of the corresponding second through hole are equal, and the second direction is parallel to the width direction of the first wall.

10. The battery cell as described in claim 7, characterized in that, The first through hole has a first inner wall and a second inner wall distributed along the first direction, and the alignment hole has a third inner wall and a fourth inner wall distributed along the first direction, and a fifth inner wall and a sixth inner wall distributed along the second direction. The first inner wall and the third inner wall have the same shape, the second inner wall and the third inner wall have the same shape, and the fifth inner wall and the sixth inner wall are parallel to the first direction.

11. The battery cell as described in claim 10, characterized in that, At least one of the first through holes is a circular hole, and the first inner wall, the second inner wall, the third inner wall, and the fourth inner wall are all arc-shaped inner wall surfaces; or, At least one of the first through holes is a rectangular hole, the alignment hole is a rectangular hole, and the first inner wall is parallel to the third inner wall, and the second inner wall is parallel to the fourth inner wall; or, At least one of the first through holes is a triangular hole, the alignment hole is a trapezoidal hole, and the first inner wall is parallel to the third inner wall, and the second inner wall is parallel to the fourth inner wall.

12. The battery cell as described in claim 10, characterized in that, In the first direction, the difference between the size of the alignment hole and the size of the opposite first through hole is greater than 0 mm and less than or equal to 3 mm; or, In the first direction, the difference between the size of the alignment hole and the size of the other second through hole is greater than 0 mm and less than or equal to 3 mm.

13. The battery cell as described in claim 12, characterized in that, In the first direction, the difference between the size of the alignment hole and the size of the first through hole is greater than or equal to 0 mm and less than or equal to 0.5 mm; or, In the first direction, the difference between the size of the alignment hole and the size of the other second through hole is greater than or equal to 0 mm and less than or equal to 0.5 mm.

14. The battery cell according to any one of claims 1 to 6, characterized in that, In the second direction, the first through hole is located in the central region of the insulating structure or the isolation structure, and the second direction is parallel to the width direction of the first wall.

15. The battery cell as described in claim 14, characterized in that, In the second direction, if the dimension of the first wall is W1, and the distance between the first through hole and the side wall of the outer casing is W2, then: |W2-W1 / 2|≤5mm.

16. The battery cell as described in claim 15, characterized in that, In the second direction, the distance between the first through hole and the sidewalls on both sides of the housing is equal.

17. The battery cell according to any one of claims 1 to 6, characterized in that, The plurality of first through holes are symmetrically distributed in pairs with respect to the center line of the length direction of the first wall. The center distance between two symmetrical first through holes is C1, and the length of the first wall is L. Then C1 = (L-10mm, L-60mm).

18. The battery cell as described in claim 1, characterized in that, The cross-sectional area of ​​the third through hole is greater than or equal to the cross-sectional area of ​​the first through hole.

19. The battery cell as described in claim 18, characterized in that, The number of support blocks is multiple, and each of the multiple support blocks is provided with a third through hole. The multiple third through holes have the same shape and the same size.

20. The battery cell as described in claim 19, characterized in that, The cross-sectional area of ​​each of the third through holes is equal to the cross-sectional area of ​​the alignment hole.

21. The battery cell as described in claim 1, characterized in that, At least one edge of the support block is flush with at least one edge of the plate body.

22. The battery cell according to any one of claims 1 to 6, characterized in that, The first wall is provided with a pressure relief structure, the first through hole and the pressure relief structure are spaced apart in the length direction of the first wall, and the second through hole and the pressure relief structure are spaced apart in the length direction of the first wall.

23. The battery cell as described in claim 22, characterized in that, The isolation structure is provided with a fourth through hole, the cross-sectional area of ​​which is smaller than the cross-sectional area of ​​any of the first through holes.

24. The battery cell according to any one of claims 1 to 6, characterized in that, The isolation structure has only two holes, and the insulation structure has only two holes. The two holes in one of the isolation structure and the insulation structure are the first through holes, and the two holes in the other are the second through holes.

25. The battery cell according to any one of claims 1 to 6, characterized in that, The insulating structure includes an insulating film, which includes a first part and a second part. The first part is located between the electrode assembly and the first wall, and the second part is connected to the first part. The second part is annular and wraps around the outer periphery of the electrode assembly.

26. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-25.

27. An electrical appliance, characterized in that, The electrical device includes the battery as described in claim 26, the battery being used to provide electrical energy.

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