Battery cell, battery, and electric device

Abstract

The present application is applicable to the technical field of batteries, and provides a battery cell, a battery, and an electric device. The battery cell comprises a casing, an electrode assembly, an insulating structure, and an isolation structure; the casing has an inner cavity and a first wall; the electrode assembly is arranged in the inner cavity; the isolation structure and the insulating structure are both arranged between the electrode assembly and the first wall; at least two first through holes are formed in one of the insulating structure and the isolation structure, and second through holes respectively corresponding to the first through holes are formed in the other one; the second through holes comprise an alignment hole; and the cross-sectional area of the alignment hole is larger than the cross-sectional area of the corresponding first through hole, or the cross-sectional area of the alignment hole is larger than the cross-sectional areas of the other second through holes. The alignment hole is formed in the battery cell provided by the present application, and therefore at least two positioning pins can be inserted between the insulating structure and the isolation structure for positioning, thereby achieving a better positioning effect.

Description

Battery cells, batteries and electrical devices

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on August 1, 2023, with application number 202322048883.0 and application name “Battery Cell, Battery and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

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

[0003] During the production process of the battery, the insulating structure and the isolation structure need to be positioned to facilitate the subsequent connection of the insulating structure and the isolation structure.

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

[0005] However, in the process of positioning the insulating structure and the isolation structure, it is difficult to achieve the positioning of the insulating structure and the isolation structure through more than one positioning structure, resulting in a problem of positioning difficulty.

[0006] Summary of the Invention

[0007] The purpose of the embodiments of the present application is to provide a battery cell, a battery, and an electrical device, aiming to solve the technical problem of difficulty in positioning the insulating structure and the isolation structure in the prior art.

[0008] To achieve the above objectives, the technical solution adopted in this application is:

[0009] In a first aspect, a battery cell is provided, comprising:

[0010] a housing, the housing having an interior cavity and a first wall;

[0011] an electrode assembly, disposed in the inner cavity;

[0012] an insulating structure, at least a portion of the insulating structure being located between the electrode assembly and the first wall;

[0013] an isolation structure, the isolation structure being disposed between the electrode assembly and the first wall;

[0014] One of the insulating structure and the isolation structure is provided with at least two first through holes, and the other is provided with a second through hole corresponding to each first through hole, wherein the cross-sectional area of ​​the second through hole in a direction parallel to the first wall is greater than or equal to the cross-sectional area of ​​the corresponding first through hole, and the plurality of second through holes includes at least one alignment hole;

[0015] The cross-sectional area of ​​the alignment hole is larger than the cross-sectional area of ​​the first through hole corresponding thereto, or the cross-sectional area of ​​the alignment hole is larger than the cross-sectional area of ​​any other second through hole.

[0016] During the manufacturing process of this type of battery cell, the insulating structure and the isolation structure are positioned by a positioning structure, which first extends into the first through hole and then into the second through hole opposite to the first through hole. Since the plurality of positioning structures are generally of the same shape and size, and the cross-sectional area of ​​the alignment hole in the second through hole is larger than the cross-sectional area of ​​the first through hole to which it is correspondingly arranged, or when the cross-sectional area of ​​the alignment hole is larger than the cross-sectional area of ​​the other second through holes, when one of the positioning structures is inserted into the corresponding first through hole and the positioning hole of the non-alignment hole, the insulating structure and the isolation structure are relatively positioned to a certain extent. Since 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 partial area of ​​the alignment hole can correspond to the first through hole. Therefore, at least another positioning structure can be inserted into the alignment hole after the first through hole, so that the insulating structure and the isolation structure can be positioned by at least two alignment pins, and the positioning effect is better.

[0017] 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 the cross-sectional area of ​​the positioning hole, the cross-sectional area of ​​the positioning hole is equal to the cross-sectional area of ​​the corresponding first through hole, and the shape of the positioning hole is the same as the shape of the corresponding first through hole.

[0018] In this setting method, the positioning hole plays the role of reference positioning, that is, in 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 the corresponding first through hole have a better limiting effect on the positioning structure.

[0019] In some embodiments, a cross-sectional area of ​​the first through hole corresponding to the alignment hole is equal to a cross-sectional area of ​​the alignment hole, and a shape of the first through hole corresponding to the alignment hole is the same as a shape of the alignment hole.

[0020] In this arrangement, 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.

[0021] 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.

[0022] In this arrangement, the circular hole is easy to process and has a better limiting effect on the cylindrical positioning structure.

[0023] In some embodiments, the diameter of the circular hole is 1 mm-20 mm.

[0024] In this arrangement, a more appropriate size of the circular hole can be selected according to the size of the first wall to achieve a better positioning effect.

[0025] In some embodiments, the diameter of the circular hole is 2.5 mm to 7 mm.

[0026] In this arrangement, the size of the circular hole can be set according to the size of the positioning structure commonly used in the related art.

[0027] In some embodiments, in the 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.

[0028] In this arrangement, the alignment holes can reduce the influence of the dimensional errors of the insulating structure and the isolation structure in the first direction on the positioning effect.

[0029] In some embodiments, the plurality of first through holes are spaced apart in the first direction.

[0030] In this arrangement, the alignment holes can reduce the influence of the dimensional errors of the insulating structure and the isolation structure in the first direction on the positioning effect.

[0031] In some embodiments, in the second direction, a size of the first through hole is equal to a size of the corresponding second through hole, and the second direction is parallel to the width direction of the first wall.

[0032] In this arrangement, the first through hole and the second through hole have a better limiting effect on the positioning structure, thereby achieving a better positioning effect of the insulating structure and the isolation structure in the second direction.

[0033] In some embodiments, the first through hole has a first inner wall and a second inner wall distributed along the 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 the second direction, the first inner wall has the same shape as the third inner wall, the second inner wall has the same shape as the third inner wall, and the fifth inner wall and the sixth inner wall are respectively parallel to the first direction.

[0034] In this arrangement, the positioning structure can contact a larger area with the third inner wall and the fourth inner wall, resulting in a better positioning effect, and the inner wall of the alignment hole can be used more effectively to limit the positioning structure.

[0035] In some embodiments, at least one first through hole 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,

[0036] At least one first through hole is a rectangular hole, the alignment hole is a rectangular hole, the first inner wall is parallel to the third inner wall, and the second inner wall is parallel to the fourth inner wall; or,

[0037] At least one first through hole is a triangular hole, the alignment hole is a trapezoidal hole, the first inner wall is parallel to the third inner wall, and the second inner wall is parallel to the fourth inner wall.

[0038] In this arrangement, for positioning structures of different shapes, first through holes of different shapes and second through holes 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.

[0039] In some embodiments, in the first direction, the difference between the size of the alignment hole and the size of the corresponding first through hole is greater than 0 mm and less than or equal to 3 mm; or

[0040] In the first direction, a difference between the size of the alignment hole and the size of the other second through holes is greater than 0 mm and less than or equal to 3 mm.

[0041] In this arrangement, the alignment hole and the corresponding first through hole have a better limiting effect on the positioning structure, which can improve the positioning effect of the insulating structure and the isolation structure in the first direction.

[0042] 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

[0043] In the first direction, a difference between the size of the alignment hole and the size of the other second through holes is greater than or equal to 0 mm and less than or equal to 0.5 mm.

[0044] In this arrangement, the alignment hole and the corresponding first through hole have a better limiting effect on the positioning structure, which can improve the positioning effect of the insulating structure and the isolation structure in the first direction.

[0045] In some embodiments, in the second direction, the first through hole is located in a central region of the insulating structure or the isolation structure, and the second direction is parallel to a width direction of the first wall.

[0046] In this arrangement, after the positioning structure is inserted, the positioning structure is located in the middle area of ​​the insulating structure and the isolation structure, resulting in a better positioning effect.

[0047] In some embodiments, in the second direction, the size of the first wall is W1, and the distance between the first through hole and the side wall of the housing is W2, then:

[0048] ∣W2-W1 / 2∣≤5mm.

[0049] In this setting, after the positioning structure is inserted, the positioning structure is located in the middle area of ​​the insulating structure and the isolation structure, and the distance between the long sides of the insulating structure and the isolation structure is close, so the positioning effect is relatively better.

[0050] In some embodiments, in the second direction, distances between the first through hole and side walls on both sides of the housing are equal.

[0051] In this arrangement, after the positioning structure is inserted, the positioning structure is located at the center line of the insulating structure and the isolation structure in the width direction, which has a better positioning effect and can further reduce the relative torsion between the insulating structure and the isolation structure.

[0052] In some embodiments, the plurality of first through holes are symmetrically distributed in pairs relative to the center line of the length direction of the first wall, the center distance between two symmetrical first through holes is C1, the length of the first wall is L, then C1 = (L-10mm, L-60mm).

[0053] In this setting method, the first through hole is set on the insulating structure or the isolation structure. Taking the first through hole set on the insulating structure as an example, there is a certain distance between the first through hole and the short sides of the insulating structure on both sides, so that the structural strength of the area between the first through hole and the short side on the insulating structure is relatively greater.

[0054] 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.

[0055] In this arrangement, the insulating structure is arranged closer to the electrode assembly, and the isolation structure is located between the insulating structure and the first wall, which facilitates production and processing.

[0056] In some embodiments, the isolation structure includes a plate body, the plate body includes a first surface arranged perpendicular to the thickness direction of the plate body, a first through hole is arranged through the plate body along the thickness direction of the plate body, a support block is arranged on the first surface, and the support block is arranged in an area of ​​the first surface where the first through hole is not arranged.

[0057] In this arrangement, the provision of the support blocks improves the structural strength of the plate body.

[0058] In some embodiments, the isolation structure includes a plate body and a support block, the plate body includes a first surface arranged along the thickness direction of the plate body, a first through hole is arranged through the plate body along the thickness direction of the plate body, a support block is arranged on the first surface, and a third through hole is arranged on the support block along the thickness direction of the support block, the third through hole is arranged corresponding to the first through hole, and the third through hole is connected to the first through hole.

[0059] In this arrangement, 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.

[0060] In some embodiments, a cross-sectional area of ​​the third through hole is greater than or equal to a cross-sectional area of ​​the first through hole.

[0061] In this arrangement, the third through hole does not block the first through hole, making it easy for the positioning structure to pass through.

[0062] In some embodiments, there are multiple support blocks, each of which is provided with a third through hole, and the multiple third through holes have the same shape and the same size.

[0063] In this arrangement, the multiple support blocks provide a fluid channel in the isolation structure, allowing airflow between the first wall and the electrode assembly, thereby improving airflow performance between the first wall and the electrode assembly. The multiple support blocks have the same structure, facilitating production on the same production line.

[0064] In some embodiments, the cross-sectional area of ​​each third through hole is equal to the cross-sectional area of ​​the alignment hole.

[0065] Since the size of 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 block the first through hole and the second through hole.

[0066] In some embodiments, at least one side edge of the support block is flush with at least one side edge of the plate body.

[0067] In this arrangement, the support block and the plate body can be positioned by edge positioning.

[0068] 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.

[0069] In this arrangement, the first through hole and the second through hole are both arranged at positions relatively far away from the pressure relief structure, thereby reducing the contact between the anode powder discharged through the first through hole or the second through hole and the pressure relief structure.

[0070] In some embodiments, the isolation structure is provided with a fourth through hole, and the cross-sectional area of ​​the fourth through hole is smaller than the cross-sectional area of ​​any of the first through holes.

[0071] In this arrangement, the fourth through hole is provided in the isolation structure, so that the isolation structure is lighter, thereby reducing the total weight of the battery cell.

[0072] In some embodiments, only two holes are provided on the isolation structure, and only two holes are provided on the insulation structure. Both the two holes in one of the isolation structure and the insulation structure are first through holes, and both the two holes in the other structure are second through holes.

[0073] In this arrangement, since the isolation structure and the insulating structure are not provided with other holes except the first through hole and the second through hole, the amount of anode powder moving between the isolation structure and the first wall can be reduced.

[0074] In some embodiments, 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, the second part is connected to the first part, and the second part is annular and wrapped around the outer periphery of the electrode assembly.

[0075] In this configuration, the insulating film covers a larger area of ​​the electrode assembly and provides a better insulation effect.

[0076] In a second aspect, a battery is provided, comprising the battery cell provided by the above technical solution.

[0077] Since the battery includes the above-mentioned battery cell, it has at least all the beneficial effects of the above-mentioned battery cell, which will not be described in detail here.

[0078] In a third aspect, an electrical device is provided, which includes the battery provided by the above technical solution, and the battery is used to provide electrical energy.

[0079] Since the electrical device includes the above-mentioned battery, it has at least all the beneficial effects of the above-mentioned battery, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0081] FIG1 is a schematic structural diagram of an electric device provided by an embodiment of the present application;

[0082] FIG2 is a schematic structural diagram of a battery provided by one embodiment of the present application;

[0083] FIG3 is an exploded view of parts of a battery cell provided in the first embodiment of the present application;

[0084] FIG4 is an exploded view of the structural parts of the insulation structure and the isolation structure in the battery cell in FIG3 ;

[0085] FIG5 is an exploded view of a portion of the structure of a battery cell provided in a second embodiment of the present application;

[0086] FIG6 is a schematic diagram of the relative positions of the second through hole in the battery cell and the housing in FIG3 ;

[0087] 7 is a schematic diagram of the relative positions of the first through hole and the second through hole in the battery cell provided in the third embodiment of the present application;

[0088] FIG8 is a schematic diagram of the relative positions of the insulation structure and the isolation structure in the battery cell in FIG3 ;

[0089] FIG9 is an expanded schematic diagram of the insulation structure in the battery cell in FIG3 ;

[0090] FIG10 is a schematic diagram of the relative positions of the first through hole and the second through hole in the battery cell provided in the fourth embodiment of the present application;

[0091] FIG11 is a schematic diagram of the relative positions of the first through hole and the first wall in the battery cell provided in the fifth embodiment of the present application;

[0092] FIG12 is a schematic diagram of the relative positions of the first through hole and the second through hole in the battery cell provided in the sixth embodiment of the present application;

[0093] FIG13 is a schematic diagram of the relative positions of the first through hole and the second through hole in the battery cell provided in the seventh embodiment of the present application;

[0094] FIG14 is a schematic diagram of the relative positions of the first through hole and the second through hole in the battery cell provided in the eighth embodiment of the present application;

[0095] FIG15 is an exploded view of the structural parts of the insulation structure and the isolation structure in the battery cell provided in the ninth embodiment of the present application;

[0096] FIG16 is a schematic diagram of the expanded insulation structure in FIG15;

[0097] FIG17 is a schematic diagram of the relative positions of the first through hole and the first wall in the battery cell in FIG15 ;

[0098] FIG18 is an exploded view of a portion of the structure of a battery cell according to the tenth embodiment of the present application;

[0099] FIG19 is an exploded view of the isolation structure in FIG18;

[0100] FIG20 is an assembly diagram of the isolation structure in FIG19;

[0101] FIG21 is a partial enlarged view of point A in FIG20;

[0102] FIG22 is a schematic diagram showing the relative positions of the first through hole and the first wall in the battery cell provided in the eleventh embodiment of the present application.

[0103] The reference numerals used in the above drawings are as follows: 1. Electrical device; 10. Battery; 20. Control mechanism; 30. Driving mechanism; 100. Battery cell; 200. Housing; 101. Top cover patch; 102. Top cover; 103. Adapter; 104. Protective film; 110. Housing; 111. First wall; 120. Electrode assembly; 121. Cell body; 122. Tab; 130. Insulation structure; 131. First portion; 132. Second portion; 132a. First sub-membrane layer; 132b. Second sub-membrane layer; 140. Isolation structure; 141. Plate body; 1411. Fourth through hole; 142. Support block; 1421. Third through hole; 150. First through hole; 151. First inner wall; 152. Second inner wall; 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; 170. Pressure relief structure. DETAILED DESCRIPTION

[0104] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0105] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0106] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0107] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the battery cells or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0108] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0109] In the embodiments of the present application, the battery cells may be secondary batteries, which are batteries that can be recharged to activate the active materials after discharge and continue to be used. The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and the embodiments of the present application are not limited thereto.

[0110] The battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include square-shell, blade-shaped, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0111] The battery cell includes an outer shell and an electrode assembly. The outer shell includes a shell and an end cover assembly. The shell has an opening. The end cover assembly covers the opening of the shell to form an inner cavity with the shell. The shell can be a steel shell, an aluminum shell, a plastic shell, a composite metal shell, or an aluminum-plastic film.

[0112] The electrode assembly is mounted in the inner cavity and includes a battery cell body, which is provided with tabs, including positive and negative tabs. The end cap assembly includes a top cap and a top cap patch, which is located on the side of the top cap away from the housing. The top cap is provided with terminals, including positive and negative terminals. The positive tab is connected to the positive terminal, and the negative tab is connected to the negative terminal. The tabs and electrode terminals are connected via adapters. The adapters are used to prevent damage to the battery or burning of other components in the event of a short circuit, overcharge, or over-discharge in the electrode assembly, thereby ensuring safe battery use.

[0113] An insulating structure and an isolation structure are provided between the battery cell body and the shell, and a protective film is attached to the outer side of the shell.

[0114] In related designs, in order to facilitate the alignment of the bottom guard plate and the insulating structure, so as to facilitate the subsequent operation of connecting the bottom guard plate and the insulating structure, a plurality of through holes are usually set on the bottom guard plate, and a plurality of through holes are set on the insulating structure. The through holes on the bottom guard plate and the through holes on the insulating structure have the same shape and size. The through holes on the bottom guard plate and the through holes on the insulating structure correspond one to one and are interconnected. When aligning the bottom guard plate and the insulating structure, an auxiliary alignment structure is used. The auxiliary alignment structure is provided with a plurality of positioning structures (such as positioning pins). The cross-sectional shape of the positioning structure is the same as the number and shape of the through holes on the bottom guard plate, and the size matches. The positioning structures are respectively aligned with each through hole. Each positioning structure passes through the through hole on the bottom guard plate and the through hole on the insulating structure opposite to the positioning structure, thereby positioning the bottom guard plate and the insulating structure at multiple locations through the multiple positioning structures to achieve the positioning of the bottom guard plate and the insulating structure.

[0115] However, due to manufacturing errors in the production process, the distance between adjacent through holes on the bottom guard plate may not be equal to the distance between two adjacent through holes on the insulating structure. That is to say, if a through hole on the bottom guard plate is aligned with a through hole on the insulating structure, the other adjacent through hole on the bottom guard plate cannot be aligned with the other adjacent through hole on the insulating structure. In other words, the positioning structure cannot be passed through the other adjacent through hole on the bottom guard plate and cannot be aligned with the other adjacent through hole on the insulating structure, making it difficult to position the insulating structure and the bottom guard plate through more than one positioning structure, affecting the alignment effect of the bottom guard plate and the insulating structure.

[0116] Based on the above considerations, and to address the aforementioned issues, a battery cell has been designed. The battery cell includes a housing, an electrode assembly, an insulating structure, and an isolation structure. The housing has a first wall. One of the insulating structure and the isolation structure is provided with a first through-hole, and the other is provided with a second through-hole. There are multiple first through-holes and multiple second through-holes, each corresponding to the other. The multiple second through-holes include at least one alignment hole, the cross-sectional area of ​​which is greater than the cross-sectional area of ​​the corresponding first through-hole, or the cross-sectional area of ​​the alignment hole is greater 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 into the second through-hole opposite the first through-hole. Since the plurality of positioning structures are generally of the same shape and size, when the cross-sectional area of ​​the alignment hole of the second through hole is larger than the cross-sectional area of ​​the corresponding first through hole, after one of the positioning structures is inserted into the corresponding first through hole and the positioning hole of the non-alignment hole, the insulating structure and the isolation structure are relatively positioned to a certain extent, and since 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 partial area of ​​the alignment hole can also correspond to the first through hole, so that at least another positioning structure can be inserted into the first through hole and then into the alignment hole, so that the insulating structure and the isolation structure can be positioned by at least two alignment pins, and the positioning effect is better. In the case where the cross-sectional area of ​​the alignment hole is larger than the cross-sectional area of ​​the 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 partial corresponding area between the alignment hole and the first through hole for the positioning structure to be inserted, that is, when one of the positioning structures is inserted into the corresponding first through hole and the positioning hole of the non-alignment hole, at least another positioning structure can be inserted into the first through hole and then into the alignment hole, so that the insulating structure and the isolation structure can be positioned by at least two alignment pins, and the positioning effect is better.

[0117] The battery cell provided in this embodiment can be used in a battery, and the battery can be used in an electrical device, including but not limited to: mobile phones, portable devices, laptop computers, electric vehicles, electric vehicles, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys and electric airplane toys, etc. Electric 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.

[0118] Referring to Figures 1 and 2 , for ease of description, this example uses a vehicle as an example of an electrical device 1. The vehicle can be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an augmented-range vehicle, among others. A drive mechanism 30, a control mechanism 20, and a battery 10 can be provided within the vehicle. The drive mechanism 30 can be a motor, for example, and the control mechanism 20 controls the battery 10 to power the drive mechanism 30. For example, the battery 10 can be provided at the bottom, front, or rear of the vehicle. The battery 10 can be used to power other devices in the vehicle. For example, the battery 10 can serve as the vehicle's operating power source and be used for the vehicle's circuit system, such as for starting, navigation, and operating power requirements. In another example, the battery 10 can serve not only as the vehicle's operating power source, but also as the vehicle's driving power source, replacing or partially replacing fuel or natural gas for providing the vehicle's driving force. The vehicle in this example uses the aforementioned battery 10, and by improving the reliability of the battery 10, the reliability of the electrical device 1 can be improved.

[0119] Referring to 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. , the other one is respectively provided with a second through hole 160 corresponding to each first through hole 150; the first through holes 150 and the second through holes 160 are arranged in a one-to-one correspondence, and 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 arranged corresponding thereto; the multiple second through holes 160 include at least one alignment hole 161, the cross-sectional area of ​​the alignment hole 161 is greater than the cross-sectional area of ​​the first through hole 150 arranged corresponding thereto, or the cross-sectional area of ​​the alignment hole 161 is greater than the cross-sectional area of ​​any other second through holes 160.

[0120] The outer shell 110 forms the external shell structure of the battery cell 100. The outer shell 110 is at least partially hollow to form an inner cavity. The outer shell 110 has a first wall 111. The first wall 111 is one of the wall surfaces of the outer shell 110. The first wall 111 can be at least one of the bottom wall, top wall or side wall of the outer shell 110.

[0121] 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.

[0122] In some examples, the housing 110 includes a shell and an end cap assembly, a protective film 104 is affixed to the outside of the shell, the shell has an opening, and the end cap assembly covers the opening of the shell to form an inner cavity with the shell, and the shell can be a steel shell, an aluminum shell, a plastic shell, a composite metal shell or an aluminum-plastic film, etc. The first wall 111 can be located on the shell or on the end cap assembly. The electrode assembly 120 is installed in the inner cavity, and the electrode assembly 120 can be a wound structure or a laminated structure. The electrode assembly 120, the electrode assembly 120 can be placed in the inner cavity through the opening of the shell. The electrode assembly 120 includes a battery cell body 121, and the battery cell body 121 is provided with a pole ear 122, and the pole ear 122 includes a positive pole ear and a negative pole ear. The end cap assembly includes a top cover 102 and a top cover patch 101, and the top cover patch 101 is arranged on the side of the top cover 102 away from the shell. Electrode terminals are mounted on the top cover 102. These include 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. Tabs 122 are connected to the electrode terminals via adapters 103. Adapters 103 prevent damage to the battery 10 or burns to other components in the event of a short circuit, overcharge, or over-discharge in the electrode assembly 120, thereby ensuring the safety of the battery 10.

[0123] The 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. The insulating structure 130 is used to isolate the electrode assembly 120 from the outer shell 110, reducing the contact between the electrode assembly 120 and the outer shell 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.

[0124] As shown in FIG3 , in one possible embodiment, the isolation structure 140 is located between the insulating structure 130 and the first wall 111. As shown in FIG5 , in another possible embodiment, the isolation structure 140 is located on a 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.

[0125] When positioning the isolation structure 140 and the insulating structure 130, in one operation mode, the positioning structure first passes through the isolation structure 140 and then through the insulating structure 130. In this operation mode, as shown in FIG4 , 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 operation mode, the positioning structure first passes through the insulating structure 130 and then through the isolation structure 140. In this operation mode, as shown in FIG5 , 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. In other words, according to the operation flow when positioning the isolation structure 140 and the insulating structure 130, the structure that the positioning structure passes through first is provided with the first through-hole 150, and the structure that the positioning structure passes through later is provided with the second through-hole 160.

[0126] For ease of description, the following description will be further explained by taking the example that the isolation structure 140 is provided with the first through hole 150 and the insulation structure 130 is provided with the second through hole 160 .

[0127] The number of the first through holes 150 and the number of the second through holes 160 are the same. If the number of the first through holes 150 is at least two, the number of the second through holes 160 is also at least two.

[0128] The plurality of first through holes 150 are arranged at intervals, and the plurality of first through holes 150 are arranged in a one-to-one correspondence with the plurality of second through holes 160. The corresponding arrangement of 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 to each other, or all of the first through holes 150 and part of the second through holes 160 are opposite to each other.

[0129] The cross-sectional areas of the first through-hole 150 and the second through-hole 160 are both cross-sectional areas 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 that 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 projections of the second through-hole 160 and the corresponding first through-hole 150 on the first wall 111 coincide, meaning that the second through-hole 160 and the corresponding first through-hole 150 are completely opposite. When the cross-sectional area of ​​the second through-hole 160 is greater than the cross-sectional area of ​​the corresponding first through-hole 150, the projection of the corresponding first through-hole 150 on the first wall 111 is completely within the range of the projection of the second through-hole 160 on the first wall 111, meaning that the entire first through-hole 150 is partially opposite the second through-hole 160.

[0130] Part or all of the second through hole 160 is called an alignment hole 161. The alignment hole 161 is a hole in the second through hole 160 whose cross-sectional area is larger than the cross-sectional area of ​​the first through hole 150 corresponding to it, or a hole whose cross-sectional area is larger than the cross-sectional area of ​​any other second through hole 160.

[0131] For example, if there is a second through hole 160 having a larger cross-sectional area than the first through hole 150 opposite to the second through hole 160, then this type of 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.

[0132] If the cross-sectional areas of the plurality of second through-holes 160 are unequal, one or more second through-holes 160 with a larger cross-sectional area than the other second through-holes 160 are referred to as alignment holes 161. The cross-sectional area of ​​such alignment holes 161 may be larger than or equal to the cross-sectional area of ​​the corresponding first through-hole 150. In this case, some of the plurality of second through-holes 160 are alignment holes 161, while others are not. To facilitate the distinction between alignment holes 161 and the other second through-holes 160, the second through-holes 160 other than alignment holes 161 are referred to as positioning holes 162.

[0133] Among the plurality of second through holes 160, the number of alignment holes 161 may be one or more, and the number of positioning holes 162 may be one, multiple, or no positioning hole 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. As shown in FIG6 , one of the two second through holes 160 is a positioning hole 162, and the other is an alignment hole 161. Alternatively, as shown in FIG7 , both second through holes 160 are alignment holes 161. In another example, the number of first through holes 150 is three, and the number of second through holes 160 is three. Among the three second through holes 160, if the number of alignment holes 161 is one, the number of positioning holes 162 is two; if the number of alignment holes 161 is two, the number of positioning hole 162 is one; and if the number of alignment holes 161 is three, there is no positioning hole 162.

[0134] During the positioning process of the insulating structure 130 and the isolation structure 140, the positioning structure first passes through the first through-hole 150 and then passes through the second through-hole 160 corresponding to the first through-hole 150. Since at least one alignment hole 161 in the second through-hole 160 has a cross-sectional area larger than that 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 centrally arranged relative to the corresponding first through-hole 150 due to manufacturing errors, the alignment hole 161 and the corresponding first through-hole 150 are still aligned relative to each other within a certain deviation range because the cross-sectional area of ​​the alignment hole 161 is larger than that of the first through-hole 150. 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 insulating structure 130 and the isolation structure 140 by at least two positioning structures, and achieving a better positioning effect.

[0135] In the case where 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, and the cross-sectional area of ​​the alignment hole 161 is larger than the cross-sectional area of ​​the positioning hole 162. Since the cross-sectional area of ​​the positioning hole 162 is greater than or equal to the cross-sectional area of ​​the corresponding first through hole 150, and the first through hole 150 can allow the positioning structure to pass through, both the positioning hole 162 and the alignment hole 161 can accommodate the positioning structure. Since the cross-sectional area of ​​the alignment hole 161 is greater than the cross-sectional area of ​​the positioning hole 162, the cross-sectional area of ​​the alignment hole 161 must be greater than the cross-sectional area 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, the insulating structure 130 and the isolation structure 140 are positioned by at least two positioning structures, and the positioning effect is better.

[0136] As can be seen from the above, since the alignment hole 161 is provided in the second through hole 160, even if there is a manufacturing error in the distance between the alignment hole 161 and its adjacent second through hole 160, or there is a manufacturing error in the distance between the two adjacent first through holes 150, it can still be ensured that at least two positioning structures can be inserted between the insulating structure 130 and the isolation structure 140, so that the insulating structure 130 and the isolation structure 140 can be positioned by the two positioning structures, and the positioning effect is better.

[0137] It is worth noting that because the positioning structure first passes through the first through-hole 150 before extending into the second through-hole 160, the diameter of the smallest concentric circle projected by the second through-hole 160 on the first wall 111 is greater than or equal to the diameter of the smallest concentric circle projected by the first through-hole 150 on the first wall 111. In other words, the projection of the second through-hole 160 on the first wall 111 at least completely encompasses the periphery of the projection of the first through-hole 150 on the first wall 111. Furthermore, because the cross-sectional area of ​​the second through-hole 160 is larger than the cross-sectional area of ​​the corresponding first through-hole 150, the positioning structure that can pass through the first through-hole 150 can at least 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 correspond to a portion of the second through-hole 160 even if manufacturing errors occur in the first through-hole 150, resulting in the actual position of the first through-hole 150 being offset from the preset position by a certain distance. This allows the positioning structure to pass through the second through-hole 160 after passing through the first through-hole 150.

[0138] In some embodiments, as shown in FIG8 , the isolation structure 140 has a centerline P1 along its length, which is parallel to the width of the isolation structure 140. At least one first through-hole 150 is provided on either side of the centerline P1. This arrangement divides the isolation structure 140 along its length into two regions of relatively similar or equal area. Both regions are provided with a first through-hole 150, allowing for insertion of a positioning structure during positioning, resulting in a more effective positioning effect.

[0139] In some embodiments, as shown in FIG5 , the insulating structure 130 includes an insulating film, the insulating film including a first portion 131 and a second portion 132, the first portion 131 being located between the electrode assembly 120 and the first wall 111, the second portion 132 being connected to the first portion 131, and the second portion 132 being annular and wrapped around the outer periphery of the electrode assembly 120. When the electrode assembly 120 is cylindrical, the second portion 132 is annular, and when the electrode assembly 120 is prismatic (e.g., cubic), the second portion is prismatic annular. As shown in FIG5 , the electrode assembly 120 is a rectangular parallelepiped structure having four circumferential sides, and the second portion 132 is a square annular structure formed by the four side surfaces, and the four side surfaces of the second portion 132 are respectively attached to the four circumferential side surfaces of the electrode assembly 120.

[0140] Exemplarily, the electrode assembly 120 has two opposing ends, one of which has a tab 122, and the other end is opposite to the first wall 111. On the outer surface of the electrode assembly 120, one or more side surfaces connected between the two opposing ends form the circumferential surface of the electrode assembly 120, that is, the circumferential side surfaces of the electrode assembly 120. The second portion 132 wraps around the circumferential side surfaces of the electrode assembly 120. The second portion 132 wraps around the outer periphery of the electrode assembly 120, including the second portion 132 completely covering the circumferential side surfaces of the electrode assembly 120, and also including the second portion 132 covering a partial area of ​​the circumferential side surfaces of the electrode assembly 120.

[0141] For example, as shown in Figures 3 and 5, the second part 132 in the insulating film is coated on at least part of the circumferential side of the battery cell assembly, and the first part 131 in the insulating film is coated on the side of the battery cell body 121 facing the first wall 111. When the insulating film may include multiple film layer structures, different film layer structures are coated on different sides of the battery cell body 121, and the insulating films coated on adjacent sides may have overlapping areas or may not have overlapping areas and are simply connected. Among them, the film layer located between the electrode assembly 120 and the first wall 111 in the insulating film is the first part 131, and the other several film layer structures arranged around the circumference of the electrode assembly 120 constitute the second part 132. The second part 132 may be composed of an annular film layer structure, or it may be formed by connecting multiple film layer structures. The first portion 131 and the second portion 132 can be separate structures that are connected during assembly. Alternatively, as shown in FIG9 , the insulating film can be a single, integrated layer, that is, the first portion 131 and the second portion 132 are integrally formed. After folding, they wrap around multiple sides of the cell body 121. The portion between the cell body 121 and the first wall 111 is the first portion 131, and the portion surrounding and wrapping around the outer periphery of the cell body 121 is the second portion 132. The dotted lines in FIG9 represent folding marks, and the resulting structure after folding can be compared to the shape of the insulating structure 130 in FIG3 and FIG5 . In FIG9 , the first portion 131 is rectangular, with a first sub-layer 132a and a second sub-layer 132b disposed on opposite sides of the first portion 131. After folding, the first sub-layer 132a and the second sub-layer 132b are connected on opposite sides, thereby connecting the first sub-layer 132a and the second sub-layer 132b to form a rectangular ring structure, which in turn forms the second portion 132. The first sub-layer 132a and the second sub-layer 132b may be bonded to each other.

[0142] 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 having the same cross-sectional area as the first through hole 150 can be an alignment hole 161 or a positioning hole 162.

[0143] For example, as shown in FIG10 , 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 ​​alignment hole 161 is larger than that of first through hole 150 , and the cross-sectional area of ​​positioning hole 162 is equal to that of first through hole 150 (from the perspective of FIG10 , positioning hole 162 overlaps with first through hole 150 ). The shape of positioning hole 162 is the same as that of first through hole 150 . In this arrangement, the second through hole 160 having the same cross-sectional area as the first through hole 150 serves as the positioning hole 162 . Since the cross-sectional area of ​​the positioning hole 162 is equal to the cross-sectional area of ​​the first through hole 150, the positioning hole 162 can be used as a positioning reference hole. That is, during the positioning process, the positioning reference hole is first made completely correspondent to the first through hole 150, and 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 of 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, thereby preventing 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 further achieving a better positioning effect.

[0144] In another example, as shown in FIG4 , there are two first through holes 150 , and the cross-sectional areas of the two first through holes 150 are different. The first through hole 150 with a smaller cross-sectional area is arranged opposite the positioning hole 162, and the positioning hole 162 and the corresponding first through hole 150 have the same cross-sectional area. The first through hole 150 with a larger cross-sectional area is arranged opposite the alignment hole 161, and the alignment hole 161 and the corresponding first through hole 150 have the same cross-sectional area. In this arrangement, the alignment hole 161 and the positioning hole 162 each have the same cross-sectional area as the corresponding first through hole 150. The positioning structure inserted into the positioning hole 162 and the corresponding first through hole 150 plays an initial positioning role for the insulating structure 130 and the isolation structure 140, and the cross-sectional area of ​​the alignment hole 161 and the first through hole 150 opposite thereto are both larger than the cross-sectional area 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 occurs between 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.

[0145] In some examples, as shown in Figure 4, the second through hole 160 includes at least one alignment hole 161 and a 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.

[0146] In this example, there are a variety of different settings. In one setting, the two first through holes 150 have the same shape and the same cross-sectional area, the positioning hole 162 has the same shape and the same cross-sectional area as the first through hole 150 opposite to it, and the cross-sectional area of ​​the alignment hole 161 is larger than the cross-sectional area of ​​the first through hole 150 opposite to it. In another setting, the two first through holes 150 have different cross-sectional areas, and their shapes may be the same or different. The first through hole 150 with a smaller cross-sectional area has the same cross-sectional area and the same shape as the positioning hole 162, and the first through hole 150 with a larger cross-sectional area has the same cross-sectional area and the same shape as the alignment hole 161. In yet another setting, the two first through holes 150 have different cross-sectional areas, and their shapes may be the same or different. The first through hole 150 with a smaller cross-sectional area is arranged corresponding to the positioning hole 162, and the positioning hole 162 has the same cross-sectional area and the same shape as its corresponding first through hole 150. The first through hole 150 with a larger cross-sectional area is arranged corresponding to the alignment hole 161, and the cross-sectional area of ​​the alignment hole 161 is larger than the cross-sectional area of ​​the first through hole 150 with a larger cross-sectional area.

[0147] In this setting method, the positioning hole 162 plays the role of reference positioning, that is, in 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 cross-sectional area of ​​the positioning hole 162 is equal to that of the first through hole 150 and the shape is the same, when the positioning structure matches the size of the first through hole 150, the positioning structure matches the size of the positioning hole 162, that is, the isolation structure 140 plays a better limiting role for the positioning structure through the first through hole 150, and the insulating structure 130 plays a better limiting role for the positioning structure through the positioning hole 162.

[0148] 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 .

[0149] In this example, the cross-sectional area of ​​the alignment hole 161 is larger than the cross-sectional area of ​​the positioning hole 162, and the alignment hole 161 and its corresponding first through hole 150 have the same shape and equal cross-sectional area, and the positioning hole 162 and the other first through hole 150 have the same shape and equal cross-sectional area, so the cross-sectional areas of the two first through holes 150 are different, and the cross-sectional area of ​​one first through hole 150 is larger than the cross-sectional area of ​​the other first through hole 150.

[0150] Since a first through hole 150 and a 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 punched using the same punching equipment or the same punching process. Since another 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 punched using the same punching equipment or the same punching process, which facilitates production and improves production efficiency.

[0151] 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, the first through hole 150 is a circular hole; if the cross-sectional shape of the positioning structure is rectangular, 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.

[0152] In some embodiments, as shown in FIG. 4 , FIG. 6 and FIG. 10 , at least one second through hole 160 and its corresponding first through hole 150 are both circular holes, and the diameters of the two circular holes are equal.

[0153] In order to position the insulating structure 130 and the isolation structure 140 within the battery cell 100, a cylindrical positioning structure can be used. The cylindrical positioning structure includes the positioning structure being cylindrical as a whole, or the positioning structure having a truncated cone or cone at its end. The first through hole 150 and the second through hole 160 are both set as circular holes. On the one hand, since the positioning structure is usually cylindrical, it is convenient to use a universal positioning structure for positioning, and there is no need to separately open a mold to produce a special positioning structure, which saves costs. On the other hand, the production and processing technology of circular holes is more mature, and the production efficiency is higher. On the other hand, when the positioning structure is inserted into the circular hole, the inner wall of the circular hole is arranged around the circumference of the positioning structure, which can play a relatively better limiting effect on the positioning structure in any direction around the circumference.

[0154] For example, there are two first through holes 150, both of which are circular holes with unequal diameters. There are two second through holes 160, including a positioning hole 162 and an alignment hole 161. Both positioning hole 162 and alignment hole 161 are circular holes. Positioning hole 162 is equal to and corresponding to the diameter of the smaller first through hole 150, and alignment hole 161 is equal to and corresponding to the diameter of the larger first through hole 150. In other words, the diameters of the two second through holes 160 are equal to the diameters of the corresponding first through holes 150. When positioning the insulation structure 130 and the isolation structure 140 of this type of battery cell 100, the outer diameter of the positioning structure used matches the diameter of the first through hole 150 with a smaller diameter, 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, so that after the positioning hole 162 is completely aligned with the first through hole 150 with a smaller diameter, 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 to the alignment hole 161 and the first through hole 150 can still be used for the positioning structure to be inserted.

[0155] In another example, there are two first through holes 150, both of which are circular holes with the same diameter. There are 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, and the diameter of the alignment hole 161 is greater than the diameter of the first through hole 150. In other words, of the two second through holes 160, the diameter of one second through hole 160 (the positioning hole 162) is equal to the diameter of the first through hole 150 and is a circular hole.

[0156] In another example, as shown in Figure 4, the number of first through holes 150 is two, and among the two first through holes 150, one of the first through holes 150 is a circular hole, and the other first through hole 150 is a non-circular hole with a cross-sectional area larger than that of the circular hole. The number of second through holes 160 is two, including a positioning hole 162 and an alignment hole 161. The positioning hole 162 is a circular hole, and the diameter of the positioning hole 162 is equal to the diameter of the first through hole 150. The shape of the alignment hole 161 is the same as the shape of the non-circular first through hole 150, and the cross-sectional area of ​​the alignment hole 161 is equal to the cross-sectional area of ​​the non-circular first through hole 150. In other words, among the two second through holes 160, the diameter of one second through hole 160 (positioning hole 162) is equal to the diameter of the first through hole 150 and is a circular hole.

[0157] The diameter of the circular hole can be designed based on the diameter of the positioning structure, or based on the size of the first wall 111, which includes the length and width of the first wall 111. If the size of the first wall 111 is large, a relatively large circular hole can be provided to increase the contact area between the circular hole and the positioning structure, thereby improving positioning stability.

[0158] Exemplarily, the length L of the first wall 111 is 5 millimeters (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. Exemplarily, the diameter D1 of the circular hole may 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 relative to each other through the cooperation of the circular hole and the positioning structure, and the inner wall of the circular hole contacts the outer wall of the positioning structure, so that the insulating structure 130, the isolation structure 140 and the positioning structure are relatively limited through the cooperation of the circular hole and the positioning structure, and the positioning effect is better.

[0159] In some examples, the diameter D1 of the circular hole is 2.5 mm to 7 mm. For example, the diameter D1 of the circular hole can be 2.5 mm, 2.8 mm, 3 mm, 3.2 mm, 4 mm, 4.5 mm, 5 mm, 6 mm, 6.5 mm, 6.8 mm, or 7 mm. Within this range, the contact area between the inner wall of the circular hole and the outer wall of the positioning structure can be relatively larger, and the positioning stability is relatively better. A circular hole of this size is also convenient for inserting the positioning structure, facilitating the positioning operation and improving positioning efficiency.

[0160] In some embodiments, the first wall 111 is a bottom wall of the housing, and the length direction of the first wall 111 is the X direction, and the width direction is the Y direction.

[0161] The alignment hole 161 may be larger than the first through-hole 150 or larger than the other second through-holes 160 in at least one direction parallel to the first wall 111. For example, as shown in FIG6 , in some embodiments, the alignment hole 161 is larger than the corresponding first through-hole 150 in the first direction, or larger than the other second through-holes 160. The first direction is parallel to the length of the first wall 111, i.e., the first direction is the X-direction. With this arrangement, during alignment, the alignment hole 161 is larger in the first direction, i.e., relatively larger in the X-direction. This allows for a certain range of deviation between the alignment hole 161 and the 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. Because manufacturing errors in the first direction often make it difficult to insert the positioning structure, making the alignment hole 161 larger in the first direction can, to a certain extent, alleviate alignment difficulties.

[0162] 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 in FIG11 , there are two first through holes 150, and a line connecting the center points of the two first through holes 150 is arranged at an angle 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 comprising two oppositely disposed long sides and two oppositely disposed short sides as an example, one of the first through holes 150 is arranged near one of the long sides, while the other first through hole 150 is arranged near the other long side, such that a line connecting the center points of the two first through holes 150 is arranged at an angle relative to the center line of the first wall 111 in the width direction. The first through hole 150 being arranged near one of the long sides 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 smaller than the distance between the first through hole 150 and the other long side.

[0163] In some examples, as shown in FIG8 , a plurality of first through holes 150 are spaced apart in the first direction. In this arrangement, the plurality of first through holes 150 are spaced apart in the length direction of the first wall 111, and a line connecting the center points of two first through holes 150 is relatively parallel to the center line P2 of the first wall 111 in the width direction. This allows the plurality of positioning structures to be spaced apart and inserted between the insulating structure 130 and the isolation structure 140 in the length direction of the first wall 111 during positioning. This improves the positioning effect 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 larger than those in the second direction, the positioning effect is relatively better. And since the first direction is the length direction of the first wall 111, which is the same as the length direction of the side wall of the insulating structure 130 and the length direction of the isolation structure 140, after multiple positioning structures are inserted between the insulating structure 130 and the isolation structure 140, the connecting lines between the multiple positioning structures are parallel to the long side edges of the insulating structure 130 and the long side edges of the isolation structure 140, which facilitates operation during the positioning process.

[0164] In some embodiments, as shown in FIG8 , there are two first through holes 150 , each located on the isolation structure 140 . The isolation structure 140 has a centerline P1 in the longitudinal direction, which is parallel to the width of the isolation structure 140 . The two first through holes 150 are located on either side of the centerline in the longitudinal direction of the isolation structure 140 , and the two first through holes 150 are spaced apart along the first direction. This arrangement divides the isolation structure 140 into two regions of relatively similar or equal area in the longitudinal direction. Both regions are provided with first through holes 150 , allowing for insertion of a positioning structure during positioning, resulting in a better positioning effect.

[0165] In some examples, as shown in FIG10 , in the second direction, the size of the first through hole 150 is equal to the size of the corresponding second through hole 160, and the second direction is parallel to the width direction of the first wall 111. That is, in the Y direction, the size of the first through hole 150 is equal to the size of the corresponding second through hole 160. Since the size of the alignment hole 161 is relatively larger in the X direction, while the size of the alignment hole 161 is equal to the size of the first through hole 150 in the Y direction, the alignment hole 161 has a better limiting effect on the positioning structure in the Y direction, and in the X direction, the positioning structure can 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 insulation structure 130 and the isolation structure 140 in the Y direction is better, and the positioning stability is higher.

[0166] In some examples, as shown in Figures 12 to 14, the first through hole 150 has a first inner wall 151 and a second inner wall 152 distributed along the first direction, 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 the second direction, the first inner wall 151 has the same shape as the third inner wall 163, the second inner wall 152 has the same shape as the third inner wall 163, and the fifth inner wall 165 and the sixth inner wall 166 are respectively parallel to the first direction. In this arrangement, the positioning structure, which can extend into the first through-hole 150, can move within the alignment hole 161 along the first direction within the dimensional 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 dimensional 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. Because 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 area in which the positioning structure can contact the third inner wall 163 and the fourth inner wall 164 is larger, resulting in a better positioning effect and more effective use of the inner wall of the alignment hole 161 to limit the positioning structure.

[0167] For example, as shown in FIG12 , 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 semicircular, that is, the first inner wall 151 and the second inner wall 152 are both arc-shaped inner wall surfaces. A runway hole is a hole in which 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 straight surfaces. The first inner wall 151 and the third inner wall 163 have the same shape and are of equal 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 are of equal 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. Fifth inner wall 165 and sixth inner wall 166 are relatively parallel, and in the first direction, the lengths of fifth inner wall 165 and sixth inner wall 166 are equal. With this configuration, the positioning pin can be a cylindrical structure, with the dimensions of the positioning structure matching those of first through-hole 150 of the circular hole. The positioning structure can be inserted into the runway hole and move within the runway hole in the first direction. In other words, in the first direction, as long as the manufacturing offset of first through-hole 150 or second through-hole 160 is within the size range of fifth inner wall 165, the positioning structure can be inserted into second through-hole 160.

[0168] In another example, as shown in FIG13 , at least one first through-hole 150 is a rectangular hole, the alignment hole 161 is a rectangular 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. For example, in the 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 the second direction, the size of the alignment hole 161 is equal to the size of the first through-hole 150. As shown in FIG13 , 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 such 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. 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 arranged opposite to a portion of 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.

[0169] In another example, as shown in FIG14 , 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. As shown in FIG14 , 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 such 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 arranged relative to a portion of 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.

[0170] In this setting, for positioning structures of different shapes, first through holes 150 of different shapes and second through holes 160 of different shapes can be selected to improve the relative limiting effect between the first through holes 150, the second through holes 160 and the positioning structure.

[0171] In some embodiments, in the first direction, 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; 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.

[0172] In one configuration, in the first direction, the size of alignment hole 161 is larger than the size of first through hole 150. In this configuration, the difference between the size of 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. As shown in Figures 12 to 14, the size of alignment hole 161 is larger than the size of first through hole 150. The size of alignment hole 161 is D2, and the size of first through hole 150 is D1. 0mm<D2-D1≤3mm. In this configuration, the maximum deviation of 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.

[0173] In this setting, since the size difference between the alignment hole 161 and the first through hole 150 corresponding to it is within the range of 3 mm, the size difference between the alignment hole 161 and the positioning structure is relatively small, which makes the alignment hole 161 and the corresponding first through hole 150 have a better limiting effect on the positioning structure, and can improve the positioning effect of the insulating structure 130 and the isolation structure 140 in the first direction.

[0174] 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 second through hole 160 is greater than or equal to 0 mm and less than or equal to 0.5 mm. As shown in Figures 12 to 14, the size of the alignment hole 161 is greater 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≤0.5mm. In this arrangement, 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 pass through the alignment hole 161 corresponding to the first through hole 150. Since punching equipment has a certain degree of precision, the deviation of punching is generally 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 punching 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 in accordance with the accuracy standard of the punching 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.

[0175] In some embodiments, as shown in Figures 8, 15, 16 and 17, in the second direction (Y direction), the first through hole 150 is located in the middle area of ​​the insulation structure 130 or the isolation structure 140, and the second direction is parallel to the width direction of the first wall 111.

[0176] Since second through-hole 160 is provided corresponding to first through-hole 150, second through-hole 160 is also provided in the central region of insulating structure 130 or isolation structure 140. Taking the example of second through-hole 160 provided on insulating structure 130 and first through-hole 150 provided on isolation structure 140, in the second direction, first through-hole 150 is provided in the central region of isolation structure 140, and second through-hole 160 is provided in the central region of insulating structure 130.

[0177] The isolation structure 140 has two side edges spaced apart in the second direction, and the first through hole 150 is arranged in the middle area 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 close or equal.

[0178] The insulation structure 130 has two side edges spaced apart in the second direction. The second through hole 160 is disposed in the middle region of the insulation structure 130 . That is, there is a gap between the second through hole 160 and the two side edges of the insulation structure 130 , and the gap distances are similar or equal.

[0179] After the positioning structure is inserted into isolation structure 140 and insulation structure 130, the distance between the positioning structure and the two side edges of isolation structure 140 spaced apart in the second direction is close, and the distance between the positioning structure and the two side edges of isolation structure 140 spaced apart in the second direction is close. This reduces the relative swing between isolation structure 140 and insulation structure 130 and improves the positioning effect. In other words, in this arrangement, after the positioning structure is inserted, it is located in the middle area of ​​insulation structure 130 and isolation structure 140, which improves the positioning effect.

[0180] In some embodiments, as shown in FIG. 17 , in the second direction, the size of the first wall 111 is W1 , and the distance between the first through hole 150 and the side wall of the housing 110 is W2 , then: |W2-W1 / 2|≤5mm.

[0181] In Figure 17, |W2-W1 / 2|=n, and 0mm≤n≤5mm. Exemplarily, 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 housing 110 is specifically the distance between the midpoint of the first through hole 150 in the second direction and the side wall of the housing 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 housing 110. 0mm≤n≤5mm, which means that the distance between the first through hole 150 and the center line 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 center line P2 of the first wall 111 in the second direction. With this arrangement, the first through hole 150 is closer to the center line P2, and the second through hole 160 is arranged opposite to the first through hole 150. Therefore, the second through hole 160 is also arranged closer to the center line P2, and 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 within a range of no more than 5 mm. After the positioning structure is inserted, the difference in the distance between the positioning structure and the two side edges of the isolation structure 140 spaced apart in the second direction is less than 5 mm, and the difference in the distance between the positioning structure and the two side edges of the isolation structure 140 spaced apart in the second direction is less than 5 mm. This can reduce the relative swing between the isolation structure 140 and the insulating structure 130, thereby improving the positioning effect. In other words, in this arrangement, after the positioning structure is inserted, the positioning structure is located in the middle of the insulating structure 130 and the isolation structure 140, and the positioning effect is better.

[0182] As shown in FIG8 , in the second direction, the distances between first through-hole 150 and the sidewalls on both sides of housing 110 are equal. The outer side has two sidewalls spaced apart in the second direction, and the distance between first through-hole 150 and one of the sidewalls is equal to the distance between first through-hole 150 and the other sidewall. In other words, the center of first through-hole 150 is located on centerline P2 of first wall 111 in the second direction.

[0183] Since the second through hole 160 is disposed 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.

[0184] In this setting, 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, which has a better positioning effect and can further reduce the relative torsion between the insulating structure 130 and the isolation structure 140.

[0185] In some embodiments, as shown in Figure 8, multiple first through holes 150 are symmetrically distributed in pairs relative 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, the length of the first wall 111 is L, then C1 = (L-10mm, L-60mm), and the first direction is parallel to the length direction of the first wall 111.

[0186] The center of the first through hole 150 is defined as the point equidistant from the two sides of the first through hole 150 in the first direction. For example, if the first through hole 150 is a circular hole, the center of the first through hole 150 is the center of the circle of the first through hole 150. If the first through hole 150 is a rectangular hole, the center of the first through hole 150 is the intersection of the two diagonals of the first through hole 150. For 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 of the two first through holes 150.

[0187] C1=(L-10mm, L-60mm), that is, C1 is smaller than L, and 10mm<L-C1<60mm, then the distance between the center of the first through hole 150 and the side wall of the housing 110 adjacent to the first through hole 150 is greater than 5mm and less than 30mm.

[0188] In this arrangement, a certain distance exists between the first through-hole 150 and the two side walls of the housing 110 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 ensures that the region between the first through-hole 150 and the side wall of the housing 110 in the insulating structure 130 and / or isolation structure 140, where the first through-hole 150 is defined, has relatively greater structural strength.

[0189] 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 .

[0190] At least a portion of the insulating structure 130 is located between the electrode assembly 120 and the isolation structure 140. The isolation structure 140 is located between the cell assembly and the first wall 111, and between the insulating structure 130 and the first wall 111. The first through-hole 150 is provided on the isolation structure 140, and the second through-hole 160 is provided on the insulating structure 130. That is, during the process of positioning 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.

[0191] In this arrangement, the insulating structure 130 is arranged closer to the electrode assembly 120, and the isolation structure 140 is located between the insulating structure 130 and the first wall 111, which is convenient for production and processing. Exemplarily, the insulating structure 130 includes an insulating film, which is arranged to form a covering cavity. The battery cell assembly is at least partially located in the covering cavity, that is, the insulating film covers at least a portion of the outer side of the battery cell assembly, and the isolation structure 140 is located outside the covering cavity of the insulating structure 130, so that the positioning structure first passes through the isolation structure 140 and then passes through the insulating structure 130. The length of the positioning structure extending to the side of the insulating film away from the isolation structure 140 is shorter, or the positioning structure does not extend to the side of the insulating film away from the isolation structure 140, so that the positioning of the insulating film and the isolation structure 140 can be achieved, which is convenient for operation.

[0192] In some embodiments, as shown in Figure 18, the isolation structure 140 includes a plate body 141, the plate body 141 includes a first surface arranged perpendicular to the thickness direction of the plate body 141, the first through hole 150 is arranged through the plate body 141 along the thickness direction of the plate body 141, and a support block 142 is arranged on the first surface, and the support block 142 is arranged in an area of ​​the first surface where the first through hole 150 is not arranged.

[0193] Since the first surface is perpendicular to the thickness direction of the plate body 141 , the first surface is located on a side of the plate body 141 facing the first wall 111 , or a side of the plate body 141 away from the first wall 111 .

[0194] The provision of the support block 142 improves the structural strength of the board body 141. Since the support block 142 is provided in an area of ​​the first surface where the first through hole 150 is not provided, the support block 142 does not block the first through hole 150, that is, the provision of the support block 142 does not affect the positioning between the board body 141 and the insulating structure 130.

[0195] As shown in Figures 18, 19 and 20, in other embodiments, the isolation structure 140 includes a plate body 141 and a support block 142, the plate body 141 includes a first surface arranged along the thickness direction of the plate body 141, the first through hole 150 is arranged through the plate body 141 along the thickness direction of the plate body 141, the first surface is provided with a support block 142, and the support block 142 is provided with a third through hole 1421 along the thickness direction of the support block 142, the third through hole 1421 is arranged corresponding to the first through hole 150, and the third through hole 1421 is connected to the first through hole 150.

[0196] The support block 142 is provided with a third through hole 1421 along the Z direction, and the third through hole 1421 can be connected with the first through hole 150. That is to say, when the support block 142 is installed in the area where the first through hole 150 is provided on the plate body 141, the third through hole 1421 on the support block 142 is connected with the first through hole 150 for the positioning structure to pass through.

[0197] In this configuration, third through-hole 1421 is provided to allow the positioning structure to pass through. On one hand, because third through-hole 1421 is provided on support block 142, the positioning structure can pass through third through-hole 1421 and then extend into first through-hole 150. This means that support block 142 does not block first through-hole 150, allowing the insulating structure 130 and isolation structure 140 to remain in position. On the other hand, because the positioning structure passes through third through-hole 1421 and then extends into first through-hole 150, the positioning structure can be used to position the plate body 141 and support block 142.

[0198] 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 is arranged opposite to and connected to the first through hole 150, the positioning structure can pass through the third through hole 1421 and then extend into the first through hole 150. In other words, the third through hole 1421 does not block the first through hole 150, making it easier for the positioning structure to pass through.

[0199] 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 size.

[0200] When the number of support blocks 142 is equal to the number of first through holes 150, one support block 142 may be provided for each first through hole 150, and the first through hole 150 is opposite and connected to the third through hole 1421 of the oppositely disposed support block 142. Alternatively, some first through holes 150 may be provided with support blocks 142, while other first through holes 150 may not be provided with support blocks 142, and the remaining support blocks 142 may be provided in areas of the plate body 141 where no first through holes 150 are provided.

[0201] When the number of support blocks 142 is greater than the number of first through holes 150, several support blocks 142 can be arranged in areas of the plate body 141 where the first through holes 150 are arranged, while another plurality of support blocks 142 can be arranged in areas of the plate body 141 where the first through holes 150 are not arranged. For example, as shown in FIG19 , the plate body 141 is provided with two first through holes 150, while the number of support blocks 142 is four. As shown in FIG20 , two support blocks 142 are arranged corresponding to the two first through holes 150, respectively, so that the third through holes 1421 of the support blocks 142 are opposite the first through holes 150. Another two support blocks 142 are arranged in areas of the plate body 141 where the first through holes 150 are not arranged, and the third through holes 1421 of these two support blocks 142 are not opposite the first through holes 150. In this arrangement, the multiple support blocks 142 have the same structure, facilitating production on the same production line. That is, the support block 142 with the same structure produced by the same production process can be installed in the area opposite to the first through hole 150 or in the area of ​​the plate body 141 where the first through hole 150 is not provided.

[0202] In some embodiments, the cross-sectional area of ​​each third through hole 1421 is equal to the cross-sectional area of ​​the alignment hole 161. Since the cross-sectional area of ​​the alignment hole 161 is relatively the largest among the first through hole 150 and the second through hole 160, that is, the cross-sectional area of ​​the alignment hole 161 is greater than or equal to the cross-sectional area of ​​the first through hole 150, and the cross-sectional area of ​​the alignment hole 161 is greater than the cross-sectional area of ​​the non-alignment 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 alignment hole 161. Therefore, the cross-sectional areas of the third through hole 1421 and the alignment hole 161 are equal. That is, the third through hole 1421 has no obstruction with respect to the first through hole 150 and the second through hole 160, that is, no matter 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 to the plate body 141, the third through hole 1421 can be opposite to the first through hole 150 or the second through hole 160 on the plate body 141, and the third through hole 1421 has no obstruction with respect to the first through hole 150 or the second through hole 160.

[0203] In some embodiments, as shown in Figures 20 and 21, at least one side edge of the support block 142 is flush with at least one side edge of the plate body 141. For example, as shown in Figure 20, 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, and 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. Flush means that, in a plane defined by the X and Y directions, or in other words, in a plane parallel to the first wall 111, at least a portion of one side edge of the support block 142 overlaps with one side edge of the plate body 141. In other embodiments, the long side of the support block 142 may be flush with the long side of the plate body 141. The long side of the support block 142 is defined as the two side edges of the support block 142 spaced apart in the Y direction, while the long side of the plate body 141 is defined as the two side edges of the plate body 141 spaced apart in the Y direction. In this arrangement, the support block 142 and the plate body 141 can be positioned by edge positioning. For example, in the process of positioning the support block 142 and the plate body 141, a limiting structure is provided, which has a limiting surface. The limiting surface is parallel to a side edge of the plate body 141. The side edge of the plate body 141 is moved to contact the limiting surface, and then the side edge of the support block 142 is moved to contact the limiting surface. In this way, the side edge of the support block 142 is flush with the side edge of the plate body 141, which is conducive to positioning the plate body 141 and the support block 142, so as to facilitate the connection between the plate body 141 and the support block 142. The plate body 141 and the support block 142 can be connected by hot melt. In some embodiments, the insulating structure 130 and the isolation structure 140 are connected by hot melt.

[0204] In some embodiments, as shown in FIG22 , a pressure relief structure 170 is provided on the outer shell 110. The pressure relief structure 170 is used to release the internal pressure of the battery cell 100. For example, when the internal pressure or temperature of the battery cell 100 reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 100 reaches the predetermined threshold, the pressure relief structure 170 actuates or a weakened structure within the pressure relief structure 170 is destroyed, thereby forming an opening or channel for releasing the internal pressure or temperature. The threshold design varies depending on the design requirements. The threshold may depend on the material of one or more of the positive electrode sheet, negative electrode sheet, 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 sheet mounted on the outer shell 110. The pressure relief structure 170 may be provided on the end cap assembly or on the sidewall or bottom wall of the housing. For example, the pressure relief structure 170 may be integrally formed with the outer shell 110. As an example, the pressure relief structure 170 can also be separately provided and connected to the housing 110. The "activation" mentioned in this example means that the pressure relief structure 170 produces an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell 100 can be released. The action produced by the pressure relief structure 170 may include but is not limited to: the components in the pressure relief structure 170 move to form an exhaust channel, at least a part of the pressure relief structure 170 is broken, shattered, torn or opened, etc. When the pressure relief structure 170 is actuated, the high-temperature and high-pressure substances inside the battery cell 100 will be discharged from the actuated part as emissions. In this way, the battery cell 100 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents. Emissions from the battery cell 100 include but are not limited to: electrolyte, dissolved or split positive and negative electrodes, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0205] 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 .

[0206] 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 a position close to at least a portion of the insulating structure 130 and close to the isolation structure 140 .

[0207] The first through hole 150 and the pressure relief structure 170 are spaced apart in the length direction of the first wall 111. When 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 arranged opposite to each other.

[0208] The second through hole 160 and the pressure relief structure 170 are spaced apart in the length direction 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 arranged opposite to each other.

[0209] In this arrangement, since the first through hole 150 and the second through hole 160 of the pressure relief structure are both arranged at a position 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 contacting the pressure relief structure 170 is reduced, thereby reducing or even avoiding the corrosion of the pressure relief structure 170 to a certain extent.

[0210] As shown in Figure 22, in the X direction, the distance between the first through hole 150 and the pressure relief structure 170 is C2, and C2 is specifically 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, that is, 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 may 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 may be 30 mm, 32 mm, 36 mm, 38 mm, 39 mm, 40 mm, or 42 mm, etc.

[0211] In some embodiments, the isolation structure 140 is provided with a fourth through hole 1411 , and the cross-sectional area of ​​the fourth through hole 1411 is smaller than the cross-sectional area of ​​any first through hole 150 .

[0212] The fourth through hole 1411 penetrates the isolation structure 140 along the thickness direction of the isolation structure 140, that is, along the Z direction. The diameter of the fourth through hole 1411 is smaller than the diameter of any first through hole 150. The number of the fourth through hole 1411 can be one or more.

[0213] In this configuration, the provision of the fourth through-holes 1411 in the isolation structure 140 makes the isolation structure 140 lighter, thereby reducing the total weight of the battery cell 100. Furthermore, the provision of the fourth through-holes 1411 facilitates fluid flow between the two sides of the isolation structure 140 in the Z direction, and thus facilitates airflow between the first wall 111 and the electrode assembly 120, thereby improving airflow performance between the first wall 111 and the electrode assembly 120.

[0214] In some embodiments, as shown in Figure 4, only two holes are provided on the isolation structure 140, and only two holes are provided on the insulation structure 130. 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 one are both second through holes 160.

[0215] For example, the isolation structure 140 is provided with only two holes, both of which are first through-holes 150, while the insulation structure 130 is provided with only two holes, both of which are second through-holes 160. Alternatively, the isolation structure 140 is provided with only two holes, both of which are second through-holes 160, while the insulation structure 130 is provided with only two holes, both of which are first through-holes 150. In other words, in this configuration, the isolation structure 140 is not provided with the fourth through-hole 1411.

[0216] In this arrangement, since no other holes are provided on the isolation structure 140 and the insulating structure 130 except the first through hole 150 and the second through hole 160, at most only two channels are formed in the insulating structure 130 and the isolation structure 140 through the first through hole 150 and the second through hole 160, that is, the number of openings in the insulating structure 130 and the isolation structure 140 is reduced, and the number of outflow channels for the anode powder is reduced, thereby reducing the amount of anode powder flowing between the electrode assembly 120 and the shell, reducing the possibility of short circuit of the battery 10 or corrosion of the shell.

[0217] Based on the above-mentioned battery cell 100, this embodiment further provides an example of a battery 10. The battery 10 includes the battery cell 100 provided in any of the above-mentioned embodiments.

[0218] The battery 10 may 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.

[0219] The battery 10 may also be a battery pack, which includes a housing 200 and battery cells 100, with the battery cells 100 or battery modules contained within the housing 200. The housing 200 is used to provide a storage space for the battery cells 100 or battery modules. The housing 200 may be independent of other structures of the electrical device 1, or the housing 200 may be part of other structures within the electrical device 1. For example, when the electrical device 1 is a vehicle, the housing 200 may be part of the vehicle's chassis. For example, a portion of the housing 200 may form at least a portion of the vehicle's floor, or a portion of the housing 200 may form at least a portion of the vehicle's crossbeam or longitudinal beam.

[0220] In a battery pack, there may be multiple battery cells 100, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 100. Multiple battery cells 100 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery pack 100 is housed within the housing 200. Alternatively, the battery 10 may be constructed by first connecting multiple battery cells 100 in series, in parallel, or in a hybrid configuration to form a battery module. The modules are then connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing 200.

[0221] The battery 10 may further include other structures. For example, the battery 10 may further include a busbar component for achieving electrical connection between the plurality of battery cells 100 .

[0222] It is understandable that, in this example, the battery 10 including the battery cell 100 is mainly described, and the battery 10 may also include other functional components, which will not be described in detail here.

[0223] Since the battery 10 includes the battery cell 100 provided in the above embodiment, the battery 10 at least includes all the technical effects of the above battery cell 100 , which will not be described in detail here.

[0224] 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.

[0225] Since the electrical device 1 includes the battery 10 , it has at least all the beneficial effects of the battery 10 , which will not be described in detail here.

[0226] The electric device 1 may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0227] For the convenience of explanation, the following embodiments are described by taking an electrical device 1 of one embodiment of the present application as an example of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 10 is provided inside the vehicle, and the battery 10 can be provided at the bottom, head or tail of the vehicle. The battery 10 can be used to power the vehicle, for example, the battery 10 can be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery 10 to power the motor, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0228] In some embodiments of the present application, the battery 10 can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0229] In a specific implementation of this embodiment, a battery cell 100 is provided, which includes an outer shell 110, an electrode assembly 120, an insulating structure 130 and an isolation structure 140. The outer shell 110 has an inner cavity, and the outer shell 110 has a first wall 111. The outer shell 110 includes a shell and an end cover assembly, the shell has an opening, the end cover assembly covers the opening of the shell to form an inner cavity with the shell, the bottom wall and side walls of the shell are also the bottom wall and side walls of the outer shell 110, and the end cover assembly constitutes the top wall of the outer shell 110. The first wall 111 is specifically the bottom wall of the shell, that is, the first wall 111 is the wall surface of the shell that is arranged opposite to the end cover assembly. The electrode assembly 120 is installed in the inner cavity, the insulating structure 130 includes an insulating film, and the insulating film is wrapped around the outer periphery of the electrode assembly 120. The isolation structure 140 includes a bottom guard plate, which is installed in the inner cavity and is 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 is wrapped around the outside of the electrode assembly 120, and a portion of the insulating film structure is opposite the first wall 111. The isolation structure 140 is provided with first through holes 150, and the insulating film is provided with second through holes 160. The number of first through holes 150 and second through holes 160 is equal, that is, there are two first through holes 150 and two second through holes 160, and the two first through holes 150 and the two second through holes 160 are provided in a one-to-one correspondence. In a direction parallel to the first wall 111, one of the first through holes 150 has a circular cross-sectional shape, while the other first through hole 150 has a racetrack-shaped cross-sectional shape. The cross-sectional shapes of the two second through holes 160 are respectively the same as the cross-sectional shapes of their corresponding first through holes 150, and the cross-sectional areas of the two second through holes 160 are respectively equal to the cross-sectional areas of their corresponding first through holes 150, that is, the projections of the second through holes 160 and their corresponding first through holes 150 on the first wall 111 coincide. In a direction parallel to the first wall 111, the two second through holes 160 with a circular cross-sectional shape are the positioning holes 162, and the alignment holes 161 with a racetrack-shaped cross-sectional shape are the alignment holes 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.

[0230] In another specific implementation of this embodiment, a battery cell 100 is provided, which includes an outer shell 110, an electrode assembly 120, an insulating structure 130 and an isolation structure 140. The outer shell 110 has an inner cavity, and the outer shell 110 has a first wall 111. The outer shell 110 includes a shell and an end cover assembly, the shell has an opening, the end cover assembly covers the opening of the shell to form an inner cavity with the shell, the bottom wall and side walls of the shell are also the bottom wall and side walls of the outer shell 110, and the end cover assembly constitutes the top wall of the outer shell 110. The first wall 111 is specifically the bottom wall of the shell, that is, the first wall 111 is the wall surface of the shell that is arranged opposite to the end cover assembly. The electrode assembly 120 is installed in the inner cavity, the insulating structure 130 includes an insulating film, and the insulating film is wrapped around the outer periphery of the electrode assembly 120. The isolation structure 140 includes a bottom guard plate, which is installed in the inner cavity and is 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 is wrapped around the outside of the electrode assembly 120, and a portion of the insulating film structure is opposite the first wall 111. The isolation structure 140 is provided with first through holes 150, and the insulating film is provided with second through holes 160. The number of first through holes 150 and second through holes 160 is equal, that is, there are two first through holes 150 and two second through holes 160, and the two first through holes 150 and the two second through holes 160 are provided in a one-to-one correspondence. In a direction parallel to the first wall 111, one of the first through holes 150 has a circular cross-sectional shape, while the other first through hole 150 has a racetrack-shaped cross-sectional shape. The cross-sectional shapes of the two second through holes 160 are respectively the same as the cross-sectional shapes of their corresponding first through holes 150, and the cross-sectional areas of the two second through holes 160 are respectively equal to the cross-sectional areas of their corresponding first through holes 150, that is, the projections of the second through holes 160 and their corresponding first through holes 150 on the first wall 111 coincide. In a direction parallel to the first wall 111, the positioning hole 162 has a circular cross-sectional shape among the two second through holes 160, while the alignment hole 161 has a racetrack-shaped cross-sectional shape. 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 side wall of the housing is smaller than the distance between the two first through holes 150 and the other side wall.

[0231] In another specific embodiment of the present embodiment, a battery cell 100 is provided, which includes an outer shell 110, an electrode assembly 120, an insulating structure 130 and an isolation structure 140. The outer shell 110 has an inner cavity, and the outer shell 110 has a first wall 111. The outer shell 110 includes a shell and an end cover assembly, the shell has an opening, the end cover assembly covers the opening of the shell to form an inner cavity with the shell, the bottom wall and side walls of the shell are also the bottom wall and side walls of the outer shell 110, and the end cover assembly constitutes the top wall of the outer shell 110. The first wall 111 is specifically the bottom wall of the shell, that is, the first wall 111 is the wall surface of the shell that is arranged opposite to the end cover assembly. The electrode assembly 120 is installed in the inner cavity, the insulating structure 130 includes an insulating film, and the insulating film is wrapped around the outer periphery of the electrode assembly 120. The isolation structure 140 includes a bottom guard plate, which is installed in the inner cavity and is 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 is wrapped around the outside of the electrode assembly 120, and a portion of the insulating film structure is opposite the first wall 111. The isolation structure 140 is provided with first through holes 150, and the insulating film is provided with second through holes 160. The number of first through holes 150 and second through holes 160 is equal, that is, there are two first through holes 150 and two second through holes 160, and the two first through holes 150 and the two second through holes 160 are provided in a one-to-one correspondence. In a direction parallel to the first wall 111, the cross-sectional shape of one of the first through holes 150 is circular, the cross-sectional shape of the other first through hole 150 is runway-shaped, and the cross-sectional shapes of the two second through holes 160 are respectively the same as the cross-sectional shapes of their corresponding first through holes 150, and the cross-sectional areas of the two second through holes 160 are respectively equal to the cross-sectional areas of their corresponding first through holes 150, that is, the projections of the second through holes 160 and their corresponding first through holes 150 on the first wall 111 coincide. In a direction parallel to the first wall 111, the positioning hole 162 has a circular cross-sectional shape among the two second through holes 160, and the alignment hole 161 has a runway-shaped cross-sectional shape. In this embodiment, a pressure relief structure 170 is provided on the first wall 111, and in the Y direction, the distance between the two first through holes 150 and one of the side walls of the shell is smaller than the distance between the two first through holes 150 and the other side wall. Furthermore, in the X direction and the Z direction, the two first through holes 150 and the pressure relief structure 170 are spaced apart from each other, and the two second through holes 160 and the pressure relief structure 170 are spaced apart from each other.

[0232] In another specific embodiment four of this embodiment, a battery cell 100 is provided, and the battery cell 100 includes an outer shell 110, an electrode assembly 120, an insulating structure 130 and an isolation structure 140. The outer shell 110 has an inner cavity, and the outer shell 110 has a first wall 111. The outer shell 110 includes a shell and an end cover assembly, the shell has an opening, the end cover assembly covers the opening of the shell to form an inner cavity with the shell, the bottom wall and the side wall of the shell are also the bottom wall and the side wall of the outer shell 110, and the end cover assembly constitutes the top wall of the outer shell 110. The first wall 111 is specifically the bottom wall of the shell, that is, the first wall 111 is the wall surface of the shell that is arranged opposite to the end cover 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 is located between the electrode assembly 120 and the first wall 111. Specifically, the isolation structure 140 is located on the outside of the insulating film, that is, the insulating film is wrapped around the outside of the electrode assembly 120. Part of the structure of the insulating film is opposite to 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. The plate body 141 includes a first surface arranged along the thickness direction of the plate body 141, and a support block 142 is provided on the first surface. The plate body 141 is located between the insulating film and the first wall 111, and the support block 142 is located between the plate body 141 and the first wall 111. There are four support blocks 142, and the four support blocks 142 are distributed at intervals on the first surface. Two first through holes 150 are provided through the plate body 141 along its own thickness direction, and two second through holes 160 are provided on the insulating film. The two first through holes 150 are arranged at intervals along the X direction, and the two second through holes 160 are arranged in a one-to-one correspondence with the two first through holes 150. In a direction parallel to the first wall 111, one of the first through holes 150 has a circular cross-sectional shape, while the other first through hole 150 has a racetrack-shaped cross-sectional shape. The cross-sectional shapes of the two second through holes 160 are respectively identical to the cross-sectional shapes of their corresponding first through holes 150, and the cross-sectional areas of the two second through holes 160 are respectively equal to the cross-sectional areas of their corresponding first through holes 150. In other words, the projections of the second through holes 160 and their corresponding first through holes 150 on the first wall 111 coincide. In a direction parallel to the first wall 111, the circular cross-sectional shape of the two second through holes 160 is the positioning hole 162, while the racetrack-shaped cross-sectional shape is the alignment hole 161. In the Y direction, the distance between the two first through holes 150 and one side wall of the housing is smaller than the distance between the two first through holes 150 and the other side wall. The plate body 141 is also provided with a fourth through hole 1411. There are multiple fourth through holes 1411, which are distributed in a matrix in the central area of ​​the plate body 141. Along the X direction, a first through hole 150 is provided on both sides of the matrix structure formed by the multiple fourth through holes 1411.The plurality of fourth through holes 1411 are all circular holes, and the plurality of 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 first through holes 150, which are circular holes. Each support block 142 is provided with a third through hole 1421 along its thickness direction, and the third through holes 1421 on each support block 142 have the same shape and size. The 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 a 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 first through hole 150 with a runway-shaped cross-sectional shape has the largest cross-sectional area, and 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 runway-shaped cross-sectional shape. 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 having a racetrack-shaped cross-sectional shape. That is, 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 a 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 having a racetrack-shaped cross-sectional shape. That is, the projections of the first through-hole 150 having a racetrack-shaped cross-sectional shape and the corresponding third through-hole 1421 on the first wall 111 coincide.

[0233] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing having an inner cavity, the housing having a first wall; An 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, the isolation structure being disposed between the electrode assembly and the first wall; One of the insulating structure and the isolation structure is provided with at least two first through holes, and the other is provided with a second through hole corresponding to each of the first through holes, wherein in a 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 thereto, and the plurality of the second through holes include at least one alignment hole; The cross-sectional area of ​​the alignment hole is larger than the cross-sectional area of ​​the first through hole correspondingly arranged therewith, or the cross-sectional area of ​​the alignment hole is larger than the cross-sectional area of ​​any other second through hole.

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

3. The battery cell according to 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 according to claim 3, characterized in that: At least one of the second through holes and the first through hole corresponding thereto are both circular holes, and the diameters of the two circular holes are equal.

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

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

7. The battery cell according to any one of claims 1 to 6, characterized in that: In the first direction, the size of the alignment hole is larger than the size of the first through hole corresponding thereto, 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 according to claim 7, characterized in that: A plurality of the first through holes are arranged at intervals in the first direction.

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

10. The battery cell according to any one of claims 7 to 9, characterized in that: The first through hole has a first inner wall and a second inner wall distributed along the 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 the second direction, the first inner wall has the same shape as the third inner wall, the second inner wall has the same shape as the third inner wall, and the fifth inner wall and the sixth inner wall are respectively parallel to the first direction.

11. The battery cell according to 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, 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, 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 according to claim 10, characterized in that: In the first direction, the difference between the size of the alignment hole and the size of the corresponding first through hole is greater than 0 mm and less than or equal to 3 mm; or, In the first direction, a difference between a size of the alignment hole and a size of the other second through holes is greater than 0 mm and less than or equal to 3 mm.

13. The battery cell according to 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, a difference between a size of the alignment hole and a size of the other second through holes 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 13, characterized in that: In a second direction, the first through hole is located in a middle region of the insulating structure or the isolation structure, and the second direction is parallel to a width direction of the first wall.

15. The battery cell according to claim 14, characterized in that: In the second direction, the size of the first wall is W1, and the distance between the first through hole and the side wall of the housing is W2, then: |W2-W1 / 2|≤5mm.

16. The battery cell according to claim 15, characterized in that: In the second direction, the distances between the first through hole and the side walls on both sides of the housing are equal.

17. The battery cell according to any one of claims 1 to 16, characterized in that: The 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. The length of the first wall is L, then C1 = (L-10mm, L-60mm).

18. The battery cell according to any one of claims 1 to 17, characterized in that: 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.

19. The battery cell according to claim 18, characterized in that: The isolation structure includes a plate body, the plate body includes a first surface arranged perpendicular to the thickness direction of the plate body, the first through hole is arranged in the plate body along the thickness direction of the plate body, and a support block is arranged on the first surface, and the support block is arranged in an area of ​​the first surface where the first through hole is not arranged.

20. The battery cell according to claim 18, characterized in that The isolation structure includes a plate body and a support block, the plate body includes a first surface arranged along the thickness direction of the plate body, the first through hole is arranged through the plate body along the thickness direction of the plate body, the first surface is provided with the support block, the support block is provided with a third through hole along the thickness direction of the support block, the third through hole is arranged corresponding to the first through hole, and the third through hole is connected to the first through hole.

21. The battery cell according to claim 20, characterized in that A cross-sectional area of ​​the third through hole is greater than or equal to a cross-sectional area of ​​the first through hole.

22. The battery cell according to claim 21, characterized in that There are multiple support blocks, each of which is provided with the third through hole, and the multiple third through holes have the same shape and the same size.

23. The battery cell according to claim 22, 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.

24. The battery cell according to claim 20, characterized in that At least one side edge of the support block is flush with at least one side edge of the plate body.

25. The battery cell according to any one of claims 1 to 24, 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.

26. The battery cell according to claim 25, characterized in that The isolation structure is provided with a fourth through hole, and the cross-sectional area of ​​the fourth through hole is smaller than the cross-sectional area of ​​any of the first through holes.

27. The battery cell according to any one of claims 1 to 26, characterized in that: The isolation structure is provided with only two holes, and the insulation structure is provided with only two holes. The two holes in one of the isolation structure and the insulation structure are both the first through holes, and the two holes in the other structure are both the second through holes.

28. The battery cell according to any one of claims 1 to 27, characterized in that: The insulating structure includes an insulating film, and the insulating film includes a first part and a second part, the first part is located between the electrode assembly and the first wall, the second part is connected to the first part, and the second part is annular and wrapped around the outer periphery of the electrode assembly.

29. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 28.

30. An electrical device, characterized in that: The electrical device comprises the battery as claimed in claim 29, and the battery is used to provide electrical energy.

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