Battery monomer, battery pack and vehicle

Abstract

The invention relates to the technical field of batteries, and provides a single battery, a battery pack and a vehicle, the single battery comprises a shell, an electrode terminal and a first insulating part, the shell comprises a first wall, the electrode terminal is arranged on the first wall, and the first insulating part is attached to the surface of one side, provided with the electrode terminal, of the first wall; wherein the first insulating part is provided with a first through hole, the first through hole comprises a first hole part and a second hole part along the length direction of the shell, the electrode terminal is arranged in the first hole part in a penetrating manner, and the first wall forms a first exposed area at the exposed part of the second hole part. According to the battery monomer, the first insulating part and the first through hole are arranged, so that the rigidity of the first insulating part at the first through hole can be effectively ensured, the bonding yield of the first insulating part is further improved, the influence of the first insulating part on the connection effect between the first wall and the pressing strip is effectively reduced, the bonding yield between the first wall and the pressing strip is improved, and the service life of the battery monomer is prolonged. Therefore, the connection strength between the battery monomers and the pressing strips is effectively improved, and the integration rigidity of the battery pack is enhanced.

Description

[0001] This application claims priority to Chinese Patent Application No. 202421565867.7 (the earlier application was filed on July 3, 2024, and is entitled "A Battery Cell, Battery Pack and Vehicle"). Technical Field

[0002] This invention relates to the field of battery technology, and more particularly to a battery cell, a battery pack, and a vehicle. Background Technology

[0003] In electric vehicle battery integration solutions, as the weight energy density / volume energy density of battery packs increases, battery packs are gradually evolving from the original small module integration solution to CTP, CTB, and CTC architectures. As battery packs eliminate small modules and are replaced by module-less designs, the rigidity requirements for the integration of individual battery cells inside the battery pack are becoming increasingly stringent. However, existing individual battery cells have poor integration rigidity due to the outer shell covering insulating components, which are then bonded to pressure strips.

[0004] In related technologies, in order to solve the above problems, an additional window is usually made on the insulating component. However, a portion of the insulating component is still retained between the window and the pole hole on the insulating component, forming a connection part. The reserved connection part limits the window area. At the same time, if the reserved connection part is too narrow, it will cause the rigidity of the processed insulating component to deteriorate, affecting the bonding yield when the insulating component is attached to the shell. Summary of the Invention

[0005] One object of the present invention is to provide a battery cell that can meet the integration rigidity requirements of a battery pack and improve the bonding yield.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A battery cell is provided, comprising:

[0008] The outer shell, including the first wall;

[0009] Electrode terminals are disposed on the first wall;

[0010] The first insulating element is attached to the surface of the first wall on the side where the electrode terminal is located;

[0011] The first insulating member is provided with a first through hole. Along the length of the outer shell, the first through hole includes a first hole portion and a second hole portion. The electrode terminal passes through the first hole portion, and the first wall forms a first exposed area at the exposed part of the second hole portion.

[0012] Optionally, it may also include a second insulating element that covers the surfaces of the other walls of the housing besides the first wall.

[0013] Optionally, the second insulating member has a flanged portion that is circumferentially attached to the side surface of the first wall where the electrode terminal is located; along the height direction of the housing, the flanged portion is located between the first wall and the first insulating member.

[0014] Optionally, the projection of the flanged portion along the height direction of the outer shell is located within the first insulating member;

[0015] Alternatively, a portion of the flanged part may be exposed in the second hole.

[0016] Optionally, the first insulating element is provided with a reinforcing structure.

[0017] Optionally, the reinforcing structure is configured as a reinforcing rib or a reinforcing indentation.

[0018] Optionally, the first insulating member is provided with a first reinforcing structure, the first reinforcing structure being disposed around at least a portion of the first through hole.

[0019] Optionally, the first insulating member is provided with a plurality of second reinforcing structures, which are arranged circumferentially around the first through hole.

[0020] Optionally, the first insulating member is provided with two third reinforcing structures arranged at intervals along the length direction of the outer shell or along the width direction of the outer shell, and the first through hole is located between the two third reinforcing structures.

[0021] Optionally, at least one end of the third reinforcing structure extends beyond the edge of the first through hole;

[0022] And / or at least one end of the third reinforcing structure is provided with an extension, and the extension of one of the two third reinforcing structures extends toward the other.

[0023] Optionally, the electrode terminal is fitted with a third insulating member, the periphery of which is provided with an extension portion. Along the height direction of the housing, the extension portion is located between the first wall and the first insulating member, and a portion of the extension portion is exposed in the second hole.

[0024] Optionally, the housing includes a first wall, and the first wall is provided with two electrode terminals, which are arranged at intervals along the length of the housing;

[0025] Alternatively, the housing may include two first walls, which are spaced apart along the height of the housing. Each first wall has an electrode terminal. Two first insulating members are provided, each corresponding to one of the two first walls.

[0026] Optionally, the dimension of the second hole along the width direction of the housing is greater than or equal to the dimension of the first hole along the width direction of the housing.

[0027] Another object of the present invention is to provide a battery pack comprising a pressure strip and a battery cell as described above, wherein the pressure strip is bonded to the first exposed area.

[0028] Another object of the present invention is to provide a vehicle including a chassis and the aforementioned battery pack, the battery pack being disposed on the chassis.

[0029] Beneficial effects:

[0030] The battery cell provided by this invention has a first insulating member attached to the surface of a first wall on which electrode terminals are located. By providing a first through hole with a first opening and a second opening on the first insulating member, the second opening allows the electrode terminals to pass smoothly through the first opening when the first insulating member is installed onto the first wall, facilitating the installation of the first insulating member. Furthermore, the first wall forms a first exposed area at the exposed portion of the second opening, allowing the battery cell to connect to the pressure strip through this area. This enables the pressure strip to be directly bonded to the first wall when the battery cells are assembled into a battery pack. The communication between the first and second openings increases the surface area for bonding between the first wall and the pressure strip, effectively preventing interference from the position of the first insulating member on the bonding between the pressure strip and the first wall. This effectively reduces the impact of the first insulating member on the connection between the first wall and the pressure strip, improves the bonding yield between the first wall and the pressure strip, and ultimately enhances the connection strength between the battery cell and the pressure strip, strengthening the integrated rigidity of the battery pack. In addition, the design of the first through hole including the first hole portion and the second hole portion can effectively ensure the rigidity of the first insulating member at the first through hole, thereby improving the bonding yield of the first insulating member relative to the first wall.

[0031] The battery pack provided by the present invention enhances the connection strength between the battery cell and the pressure strip by bonding the pressure strip to the first exposed area of ​​the battery cell's shell, thereby improving the integrated rigidity of the battery pack.

[0032] The battery pack provided by this invention has good integrated rigidity, which effectively ensures the vehicle's electrical safety. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of one embodiment of the battery cell provided by the present invention;

[0034] Figure 2 This is an exploded view of the structure of one embodiment of the battery cell provided by the present invention;

[0035] Figure 3This is a schematic diagram of one embodiment of the first insulating member provided by the present invention;

[0036] Figure 4 This is a schematic diagram of another embodiment of the battery cell provided by the present invention;

[0037] Figure 5 This is a structural diagram of a battery cell provided by the present invention with the first insulating element removed;

[0038] Figure 6 This is a schematic diagram of the structure of the first insulating member with a first reinforcing structure provided by the present invention;

[0039] Figure 7 This invention provides Figure 6 Sectional view at point DD;

[0040] Figure 8 This invention provides Figure 7 Enlarged structural diagram at point E in the middle;

[0041] Figure 9 This is a partial cross-sectional view of one embodiment of the first insulating member provided by the present invention;

[0042] Figure 10 This is a schematic diagram of the structure of the first insulating member with a second reinforcing structure provided by the present invention;

[0043] Figure 11 This is a schematic diagram of the structure of the first insulating member with a third reinforcing structure provided by the present invention;

[0044] Figure 12 This is a schematic diagram of another embodiment of the battery cell provided by the present invention.

[0045] In the picture:

[0046] 100. Outer shell; 110. First wall; 111. First exposed area; 112. Injection hole;

[0047] 200. Electrode terminals;

[0048] 300, First insulating element; 310, First through hole; 311, First hole portion; 312, Second hole portion; 320, Reinforcing structure; 321, First reinforcing structure; 322, Second reinforcing structure; 323, Third reinforcing structure; 3231, Extension portion; 330, Clearance opening; 340, Clearance opening;

[0049] 400. Second insulating element; 410. Flanged portion; 411. First flanged portion; 412. Second flanged portion; 413. Folded overlapping area;

[0050] 500. Third insulating component; 510. Extension section;

[0051] 600. Pressure relief mechanism. Detailed Implementation

[0052] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0053] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0055] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0056] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0057] The battery cell can be a lithium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a lithium-sulfur battery, or other metal batteries, but this application does not limit this.

[0058] In some embodiments, the battery cell may include a housing for encapsulating electrode components and electrolytes, etc. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0059] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells. This application does not have any particular limitations.

[0060] In some embodiments, a battery cell may include electrode terminals, which serve as the output terminals of the battery cell to enable the input or output of electrical energy. The electrode terminals include a positive terminal and a negative terminal.

[0061] As an example, the shape of the electrode terminals can be cuboid, cylindrical, hexagonal prism, or other shapes; there are no particular limitations in this application.

[0062] The battery pack mentioned in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

[0063] In some embodiments, the battery pack can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0064] In some embodiments, the battery pack includes a pressure strip and battery cells, with the pressure strip bonded to the battery cells to ensure the structural strength of the battery pack and improve its rigidity.

[0065] In some embodiments, the battery pack can be mounted on the vehicle chassis, and has a simple and compact structure.

[0066] In some embodiments, the battery pack housing for accommodating the pressure strip and battery cells may be mounted on the chassis, or the housing may be part of the chassis. When the housing is part of the chassis, for example, a portion of the housing may be at least a portion of the vehicle's floor, or a portion of the housing may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0067] To meet the rigid integration requirements of battery packs, this application provides a battery cell, which includes a casing, electrode terminals, and a first insulating member. Specifically, the casing includes a first wall, the electrode terminals are disposed on the first wall, and the first insulating member is attached to the side surface of the first wall where the electrode terminals are disposed; wherein, the first insulating member has a first through hole, and along the length direction of the casing, the first through hole includes a first hole portion and a second hole portion, the electrode terminals are disposed in the first hole portion, and the first wall forms a first exposed area at the exposed portion of the second hole portion.

[0068] In this battery cell structure, a first insulating member is attached to the surface of the first wall where the electrode terminals are located. A first through-hole with a first opening and a second opening is provided on the first insulating member. When the first insulating member is installed onto the first wall, the second opening allows the electrode terminals to pass smoothly through the first opening, facilitating the installation of the first insulating member. Furthermore, the exposed portion of the first wall at the second opening forms a first exposed area, allowing the battery cell to connect to the pressure strip through this area. This enables the pressure strip to be directly bonded to the first wall when the battery cells are assembled into a battery pack. The communication between the first and second openings increases the surface area for bonding between the first wall and the pressure strip, effectively preventing interference from the position of the first insulating member on the bonding between the pressure strip and the first wall. This effectively reduces the impact of the first insulating member on the connection between the first wall and the pressure strip, improves the bonding yield between the first wall and the pressure strip, and ultimately enhances the connection strength between the battery cell and the pressure strip, strengthening the integrated rigidity of the battery pack. In addition, the design of the first through hole including the first hole portion and the second hole portion can effectively ensure the rigidity of the first insulating member at the first through hole, thereby improving the bonding yield of the first insulating member relative to the first wall.

[0069] This application provides a vehicle comprising a chassis and a battery pack mounted on the chassis. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The battery pack can be mounted at any location on the chassis. The battery pack can be used to power the vehicle; for example, it can serve as the vehicle's operating power source or general power source. The vehicle may also include a controller and a motor. The controller controls the battery pack to supply power to the motor, for example, to meet the vehicle's power needs during starting, navigation, and driving.

[0070] Reference Figures 1 to 5 As shown, this embodiment provides a battery cell, which includes a housing 100, electrode terminals 200, and a first insulating member 300. Specifically, the housing 100 includes a first wall 110, the electrode terminals 200 are disposed on the first wall 110, and the first insulating member 300 is attached to the side surface of the first wall 110 where the electrode terminals 200 are disposed; wherein, the first insulating member 300 is provided with a first through hole 310 along the length Y direction of the housing 100, the first through hole 310 includes a first hole portion 311 and a second hole portion 312, the electrode terminals 200 pass through the first hole portion 311, and the first wall 110 forms a first exposed area 111 at the exposed portion of the second hole portion 312.

[0071] In this embodiment, the first insulating member 300 is attached to the side surface of the first wall 110 where the electrode terminal 200 is provided. By providing a first through hole 310 with a first hole 311 and a second hole 312 on the first insulating member 300, when the first insulating member 300 is installed on the first wall 110, the second hole 312 can allow the electrode terminal 200 to pass through the first hole 311 smoothly, so that the electrode terminal 200 can pass through the first hole 311 smoothly, which facilitates the installation of the first insulating member 300. Furthermore, the first wall 110 forms a first exposed area 111 at the position corresponding to the second hole 312, allowing the battery cell to be connected to the pressure strip through the first exposed area 111. This enables the pressure strip to be directly bonded to the first wall 110 when the battery cells are assembled into a battery pack. The first hole 311 and the second hole 312 are connected, increasing the surface area for bonding between the first wall 110 and the pressure strip. This effectively prevents the position of the first insulating member 300 from interfering with the bonding between the pressure strip and the first wall 110, effectively reducing the impact of the first insulating member 300 on the connection between the first wall 110 and the pressure strip, improving the bonding yield between the first wall 110 and the pressure strip, and thus effectively improving the connection strength between the battery cell and the pressure strip, enhancing the integrated rigidity of the battery pack. In addition, the design of the first through hole 310, including the first hole 311 and the second hole 312, effectively ensures the rigidity of the first insulating member 300 at the first through hole 310, thereby improving the bonding yield of the first insulating member 300 relative to the first wall 110.

[0072] For example, the material of the first insulating element 300 includes, but is not limited to, insulating materials such as PC, PET, and mica sheets.

[0073] In this embodiment, reference is made to Figure 1 As shown, the electrode terminal 200 protrudes from the surface of the first insulating member 300 away from the first wall 110 along the height direction X of the housing 100, so as to facilitate the series or parallel connection between the electrode terminals 200.

[0074] In some embodiments, the housing 100 includes a first wall 110, which has two electrode terminals 200 arranged at intervals along the length Y direction of the housing 100. Specifically, the first insulating member 300 has two first through holes 310, which are spaced apart along the length Y direction of the housing 100 to form two first exposed areas 111 spaced apart along the length Y direction of the housing 100 on the first wall 110. This increases the connection strength between the first wall 110 and the pressure strip, enhancing the integrated rigidity of the battery pack. In this embodiment, the electrode terminals 200 can be disposed between the two first exposed areas 111 along the length Y direction of the housing 100. That is, the first hole portion 311 of the first through hole 310 is closer to the center of the first insulating member 300 along the length Y direction of the housing 100 than the second hole portion 312. Distributing the two first exposed areas 111 on both sides of the electrode terminals 200 reduces the difficulty of connecting the battery cells to the pressure strip during assembly. For example, the housing 100 includes a top cover, and the first wall 110 may be the top cover. Of course, the two electrode terminals 200 may also be arranged in other directions perpendicular to the height direction X of the housing 100, and this application embodiment is not limited in this respect.

[0075] In some embodiments, the housing 100 includes two first walls 110, which are spaced apart along the height direction X of the housing 100. Each first wall 110 is provided with an electrode terminal 200. Specifically, two first insulating members 300 are provided and are provided one-to-one with the two first walls 110, that is, a first exposed area 111 is formed on each of the two first walls 110. The two first walls 110 are bonded to two pressure strips one-to-one, effectively enhancing the integrated rigidity of the battery pack. The first hole portion 311 of the two first through holes 310 can be located on the same side of the second hole portion 312 or on different sides of the second hole portion 312. This application embodiment does not limit this. Exemplarily, the housing 100 includes a top cover and a bottom cover, one of the first walls 110 can be the top cover, and the other first wall 110 can be the bottom cover.

[0076] In this embodiment, the outer shell 100 can have various structural forms, such as cylindrical or prismatic. For example, as shown... Figure 1 As shown, the outer shell 100 has a cuboid structure. Similarly, the outer shell 100 can be made of various materials, such as steel, aluminum, plastic (e.g., polypropylene), composite metal (e.g., copper-aluminum composite), or aluminum-plastic film.

[0077] In this embodiment, the shape of the first hole portion 311 of the first through hole 310 is determined according to the shape of the electrode terminal 200.

[0078] For example, when the material of the outer casing 100 is non-metallic, the opening size of the first hole 311 can be the same as the size of the electrode terminal 200 or slightly larger than the size of the electrode terminal 200. Both can ensure good insulation between battery cells, safety, stability, and extend the service life of the individual battery cells.

[0079] For example, such as Figure 1 As shown, the electrode terminal 200 is cuboid in shape, and the corresponding first hole 311 has a rectangular projection along the height direction X of the outer casing 100, facilitating the machining of the first through hole 310. The projection shape of the second hole 312 along the height direction X of the outer casing 100 can be triangular, trapezoidal, semi-circular, or semi-elliptical, etc. For ease of machining, the connection between the first hole 311 and the second hole 312 can be smoothly transitioned.

[0080] For example, the second hole 312 has a dimension in the width direction Z of the outer casing 100 that is greater than or equal to the dimension in the width direction Z of the first hole 311 of the outer casing 100, so as to ensure that the first wall 110 has a sufficiently large surface area in the first exposed area 111 to bond with the pressure strip, thereby ensuring the connection strength between the battery cell and the pressure strip.

[0081] Optionally, to ensure that the first wall 110 has a sufficiently large surface area in the first exposed area 111, such as Figure 2 As shown, when the projection shape of the first hole 311 and the second hole 312 along the height direction X of the outer shell 100 is both rectangular, the dimension of the second hole 312 along the width direction Z of the outer shell 100 is larger than the dimension of the first hole 311 along the width direction Z of the outer shell 100. This can further increase the connection area between the first wall 110 and the pressure strip, thereby improving the connection strength between the battery cell and the pressure strip and enhancing the integrated rigidity of the battery pack.

[0082] Optionally, such as Figure 3 As shown, when the projection shape of the first hole 311 and the second hole 312 along the height direction X of the outer shell 100 is rectangular, the dimension of the first hole 311 along the width direction Z of the outer shell 100 and the dimension of the second hole 312 along the width direction Z of the outer shell 100 are equal. That is, the projection shape of the first through hole 310 composed of the first hole 311 and the second hole 312 along the height direction X of the outer shell 100 is rectangular, which is convenient for processing.

[0083] For example, when the projection shape of the electrode terminal 200 along the height direction X of the housing 100 is circular, the projection shape of the first hole 311 along the height direction X of the housing 100 can be a semi-waist-shaped hole, and the corresponding projection shape of the second hole 312 along the height direction X of the housing 100 can be rectangular, semi-circular, or semi-elliptical, etc.

[0084] In this embodiment, reference is made to Figures 1 to 5 As shown, the battery cell also includes a second insulating member 400, which covers the surfaces of the other walls of the outer casing 100, excluding the first wall 110. In this embodiment, the second insulating member 400 can be attached to the outer surface of the outer casing 100 first, and then the first insulating member 300 can be attached to the first wall 110 and the second insulating member 400.

[0085] For example, the second insulating element 400 includes, but is not limited to, an insulating film or an insulating coating. The insulating film may be a blue film.

[0086] Exemplarily, the second insulating member 400 is further provided with a second through hole, and the outer casing 100 forms a second exposed area at the exposed portion of the second through hole. The second exposed area is used to connect with the battery pack housing to ensure the integrated rigidity of the battery pack. The connection method between the second exposed area and the housing can be various, such as bonding or welding. Optionally, there can be one or more second through holes provided on the second insulating member 400. Exemplarily, the second through hole is rectangular, and correspondingly, the second exposed areas formed on the second wall are also rectangular. In other embodiments, the second through hole can also be triangular, pentagonal, circular, or elliptical, etc.

[0087] In an embodiment where the housing 100 includes a first wall 110, the housing 100 further includes a second wall and a side wall. Along the height direction X of the housing 100, the first wall 110 and the second wall are spaced apart. The side wall surrounds the periphery of the first wall 110 and the second wall; that is, the first wall 110 and the second wall are spaced apart along the height direction X of the housing 100 and respectively located at both ends of the side wall. The side wall surrounds the first wall 110 circumferentially and surrounds the second wall circumferentially. The second insulating member 400 is attached to the outer surface of the second wall and the side wall. Exemplarily, along the height direction X of the housing 100, the second through hole can be located on the side of the second wall opposite to the first wall 110, forming a second exposed area on the second wall at the location corresponding to the second through hole. Of course, the second through hole can also be located at other locations on the second insulating member 400; this embodiment is not limited to this. Exemplarily, the second insulating member 400 is provided with a second through hole corresponding to the second wall to form a second exposed area on the second wall. Of course, in other embodiments, the number of second through holes corresponding to the second wall can also be two, three, four or five, etc.

[0088] It should be noted that the structure of the outer shell 100 can be various. It can be that the first wall 110, the second wall and the side wall are all separate structures, or the second wall and the side wall are integrally formed structures with the first wall 110 connected to the end of the side wall away from the second wall, or the first wall 110 and the side wall are integrally formed structures with the second wall connected to the end of the side wall away from the first wall 110.

[0089] Taking a structure where the sidewall and the second wall are integrally formed as an example, one end of the sidewall is connected to the second wall, and the other end forms an opening opposite to the second wall. That is, the sidewall and the second wall form a shell with a receiving cavity for accommodating the electrode assembly and electrolyte. The receiving cavity has an opening; in other words, the sidewall and the second wall form a hollow structure with one open end. The first wall 110 covers the opening of the sidewall, meaning the first wall 110 is the end cap of the outer shell 100 used to close the opening. The first wall 110 covers the opening of the sidewall and forms a sealed connection to create a sealed space for accommodating the electrode assembly and electrolyte. In other words, the first exposed area 111 is formed on the end cap of the outer shell 100. Of course, the outer shell 100 is not limited to the structure described above.

[0090] In an embodiment where the housing 100 includes two first walls 110, the housing 100 also includes side walls surrounding the two first walls 110, i.e., the two first walls 110 are spaced apart along the height direction X of the housing 100 and respectively disposed at both ends of the side walls. The second insulating member 400 is attached to the outer surface of the side wall.

[0091] It should be noted that the structure of the outer shell 100 can be varied. It can be a separate structure of the two first walls 110 and the side wall, or it can be a one-piece structure of one of the two first walls 110 and the side wall.

[0092] Taking the two first walls 110 and the side walls as separate structures as an example, the side walls enclose to form a hollow structure with openings at both ends. The two first walls 110 respectively cover the two openings of the side walls and form a sealed connection to form a sealed space for accommodating the electrode assembly and electrolyte.

[0093] It should be noted that the electrode assembly is the component in the battery cell where the electrochemical reaction occurs. The electrode assembly may include a positive electrode, a negative electrode, and a separator. The structure of the electrode assembly can be varied; for example, it can be a wound structure formed by winding the positive electrode, separator, and negative electrode, or a stacked structure formed by arranging the positive electrode, separator, and negative electrode in layers. Similarly, there may be one or more electrode assemblies disposed within the housing 100. Exemplarily, the electrode terminals 200, current collectors, and tabs are stacked and welded together to achieve electrical connection between the electrode terminals 200 and the electrode assembly, thereby using the electrode terminals 200 as the output electrode of the battery cell to realize the input or output of electrical energy from the battery cell.

[0094] It should be noted that the electrolyte plays a role in conducting ions between the positive and negative electrodes. There are no specific restrictions on the type of electrolyte; it can be selected according to the needs. Electrolytes can be liquid, gel, or solid.

[0095] In this embodiment, by configuring the insulator as a separate first insulating member 300 and a second insulating member 400, where the first insulating member 300 covers the first wall 110 and the second insulating member 400 wraps around the surfaces of the other walls of the outer casing 100 besides the first wall 110, the assembly difficulty between the insulating member and the outer casing 100 is reduced. Of course, the first insulating member 300 and the second insulating member 400 can also be integrally formed insulating members to improve the insulation isolation effect between the outer casing 100 and the external environment, reducing the risk of short circuits in the battery cells during use.

[0096] In this embodiment, reference is made to Figure 2 and Figure 5 As shown, the second insulating member 400 has a flanged portion 410, which is attached to the circumferential surface of the first wall 110 on the side where the electrode terminal 200 is located. Along the height direction X of the housing 100, the flanged portion 410 is located between the first wall 110 and the first insulating member 300, so that the first insulating member 300 and the first wall 110 jointly press the flanged portion 410 together, effectively preventing the flange from curling up and improving the connection stability of the flanged portion 410 of the second insulating member 400 on the first wall 110, thereby reducing the possibility of the flanged portion 410 detaching. It can be understood that the second insulating member 400 has a flanged portion 410 located on the outer surface of the first wall 110, and the flanged portion 410 is a ring-shaped structure extending circumferentially along the first wall 110.

[0097] For example, the first insulating member 300 can be a rectangular structure, and the flange portion 410 includes two first flange portions 411 disposed opposite to each other along the length direction Y of the outer shell 100, and two second flange portions 412 disposed opposite to each other along the width direction Z of the outer shell 100. Adjacent first flange portions 411 and second flange portions 412 have a folded overlapping area 413, and the shape of the folded overlapping area 413 can be triangular.

[0098] In some embodiments, the projection of the flange 410 along the height direction X of the housing 100 is located within the first insulating member 300, that is, the width of the flange 410 is less than or equal to the distance between the edge of the first exposed area 111 and the edge of the first wall 110. This prevents the flange 410 from being exposed in the first exposed area 111 and affecting the connection between the first exposed area 111 and the pressure strip, effectively ensuring the assembly quality and operational stability of the battery pack with this type of battery cell. Furthermore, the fact that the projection of the flange 410 along the height direction X of the housing 100 is located within the first insulating member 300 can prevent the flange 410 of the folded overlapping area 413 from warping.

[0099] In some embodiments, the flange portion 410 is partially exposed in the second hole portion 312, which can reduce the drilling accuracy of the second hole portion 312. When assembling the first insulating member 300, the second hole portion 312 may not completely cover the flange portion 410, thereby reducing the assembly difficulty and facilitating the covering of the first insulating member 300 and the second insulating member 400. Exemplarily, the flange portion 410 exposed in the first exposed area 111 can be a first flange portion 411 folded along the length direction Y of the outer shell 100, or a second flange portion 412 folded along the width direction Z of the outer shell 100. This embodiment of the application is not limited to this.

[0100] In this embodiment, reference is made to Figures 6 to 11 As shown, the first insulating member 300 is provided with a reinforcing structure 320 to improve the structural strength and structural stability of the first insulating member 300.

[0101] For example, the reinforcing structure 320 includes, but is not limited to, reinforcing ribs or reinforcing indentations, which facilitates molding. In this embodiment, the reinforcing structure 320 may protrude toward the first wall 110 along the height direction X of the outer shell 100, or it may protrude away from the first wall 110 along the height direction X of the outer shell 100.

[0102] For example, such as Figure 7 and Figure 8 As shown, the cross-sectional shape of the reinforcing structure 320 includes, but is not limited to, V-shape, trapezoid, and wave shape.

[0103] In some embodiments, such as Figure 6 As shown, the first insulating member 300 is provided with a first reinforcing structure 321, which surrounds at least part of the first through hole 310 to improve the structural strength and structural stability of the first insulating member 300 at the first through hole 310.

[0104] For example, the first reinforcing structure 321 may be annular. In this embodiment, at least one first reinforcing structure 321 is provided. When multiple first reinforcing structures 321 are provided, the size of the first reinforcing structures 321 increases sequentially and is arranged around the first through hole 310.

[0105] For example, the first reinforcing structure 321 can be an open annular shape, effectively preventing large stress concentrations in the first reinforcing structure 321. The opening of the first reinforcing structure 321 can face the length direction Y, the width direction Z, or other directions perpendicular to the height direction X of the outer shell 100. Of course, multiple open annular first reinforcing structures 321 can be provided, and the openings of the multiple first reinforcing structures 321 can face the same or different directions, all of which can further improve the structural strength and stability of the first insulating member 300 at the first through hole 310. For example, Figure 6As shown, the shape of the open-ring first reinforcing structure 321 can be U-shaped. Of course, the shape of the open-ring first reinforcing structure 321 can be L-shaped or other shapes, and this embodiment of the application is not limited to this.

[0106] In some embodiments, such as Figure 10 As shown, the first insulating member 300 is provided with a plurality of second reinforcing structures 322, which are arranged circumferentially around the first through hole 310 to prevent large stress concentration between the second reinforcing structures 322, thereby effectively improving the structural strength and structural stability of the first insulating member 300 at the first through hole 310.

[0107] For example, at least three of the two sides along the first direction and the two sides along the second direction are provided with second reinforcing structures 322 to ensure the structural strength and stability of the first insulating member 300 at the first through hole 310. The plurality of second reinforcing structures 322 are at least partially arranged around the first through hole 310. The first direction can be the length direction Y of the housing 100, and the second direction can be the width direction Z of the housing 100.

[0108] For example, at least one discontinuous second reinforcing structure 322 may be provided along each side of the first through hole 310 in the circumferential direction.

[0109] Optionally, three second reinforcing structures 322 are provided, two of which extend along the first direction and are respectively disposed on both sides of the first through hole 310 along the second direction; the remaining second reinforcing structure 322 is disposed along the first direction between the edge of the second hole 312 and the edge of the first insulating member 300, effectively preventing large stress concentrations between the second reinforcing structures 322 and ensuring the structural strength and stability of the first insulating member 300 at the first through hole 310. Of course, four, five, six or other numbers of second reinforcing structures 322 can also be provided, and this embodiment of the application is not limited to this.

[0110] Optionally, at least one second reinforcing structure 322 is provided on the same side of the first through hole 310 along a direction, and is arranged side by side, in an array, or staggered along that direction. This direction includes, but is not limited to, the length direction Y and the width direction Z of the housing 100, so as to further improve the structural strength and structural stability of the first insulating member 300 at the first through hole 310.

[0111] In some embodiments, such as Figure 11As shown, the first insulating member 300 is provided with two third reinforcing structures 323 arranged at intervals along the length direction Y or the width direction Z of the outer shell 100. The first through hole 310 is located between the two third reinforcing structures 323 to further increase the structural strength and structural stability of the first insulating member 300.

[0112] For example, at least one end of the third reinforcing structure 323 extends beyond the edge of the first through hole 310 to further increase the structural strength and structural stability of the first insulating member 300.

[0113] For example, at least one end of the third reinforcing structure 323 is provided with an extension 3231, and the extension 3231 of one of the two third reinforcing structures 323 extends toward the other to further increase the structural strength and structural stability of the first insulating member 300 at the first through hole 310.

[0114] Optionally, taking the arrangement of two third reinforcing structures 323 spaced apart along the width direction Z of the outer casing 100 as an example, in some embodiments, along the length direction Y of the outer casing 100, the first ends of the two third reinforcing structures 323 extend beyond the edge of the second hole 312, and extend towards each other along the width direction Z of the outer casing 100 to form a first extension portion, that is, the shape of the third reinforcing structure 323 is L-shaped. In this case, the structural strength of the first insulating member 300 is relatively poor at the corner of the second hole 312 away from the first hole 311 along the length direction Y of the outer casing 100. The provision of the first extension portion can improve the structural strength at this location, thereby further increasing the structural strength and structural stability of the first insulating member 300. In some embodiments, along the length direction Y of the outer casing 100, the second ends of the two third reinforcing structures 323 extend beyond the edge of the first hole 311, and extend towards each other along the width direction Z of the outer casing 100 to form a second extension portion. Of course, both ends of the two third reinforcing structures 323 can extend beyond the edge of the first through hole 310 and extend toward each other in the width direction Z of the outer shell 100 to form an extension portion 3231; or the different ends of the two third reinforcing structures 323 can extend beyond the edge of the first through hole 310 and extend toward each other in the width direction Z of the outer shell 100 to form an extension portion 3231.

[0115] In this embodiment, at least one of a first reinforcing structure 321, a second reinforcing structure 322, and a third reinforcing structure 323 may be provided on the first insulating member 300 to increase the structural strength and structural stability of the first insulating member 300.

[0116] In this embodiment, reference is made to Figure 5 and Figure 12As shown, the electrode terminal 200 is fitted with a third insulating member 500. The periphery of the third insulating member 500 is provided with an extension portion 510. Along the height direction X of the outer shell 100, the extension portion 510 is located between the first wall 110 and the first insulating member 300, and part of the extension portion 510 is exposed in the second hole portion 312 to enhance the insulation protection of the electrode terminal 200.

[0117] For example, the extension portion 510 may be in the form of a ring, a semi-ring, or multiple fan-shaped rings spaced around the third insulating member 500.

[0118] For example, the material of the third insulating member 500 includes, but is not limited to, insulating materials such as PPS, LCP, and PBT, to enhance the insulation protection of the electrode terminal 200.

[0119] For example, the extension portion 510 can be attached to the first insulating member 300, that is, the extension portion 510 can support the first insulating member 300 to ensure the structural stability of the first insulating member 300 at the first through hole 310.

[0120] In this embodiment, when the outer shell 100 is made of insulating material, the battery cell may not have the second insulating member 400 and the third insulating member 500, but the battery cell is provided with the first insulating member 300. The second hole 312 can constrain the adhesive of the bonding strip and position the bonding between the bonding strip and the first wall 110.

[0121] In this embodiment, reference is made to Figure 2 and Figure 5 As shown, the battery cell may also include a pressure relief mechanism 600, which is mounted on the housing 100. The pressure relief mechanism 600 is used to release the internal pressure of the battery cell when the internal pressure or temperature of the battery cell reaches a predetermined value.

[0122] Optionally, the pressure relief mechanism 600 may be disposed on the first wall 110 of the housing 100, or it may be disposed on another wall of the housing 100 other than the first wall 110. For example, as shown... Figure 2 and Figure 5 As shown, the pressure relief mechanism 600 is disposed on the first wall 110. Correspondingly, the first insulating member 300 is provided with a clearance opening 330 for avoiding the pressure relief mechanism 600, so as to facilitate the pressure relief mechanism 600 to release the pressure inside the battery cell. Exemplarily, the pressure relief mechanism 600 is disposed on a wall other than the first wall 110, and correspondingly, the second insulating member 400 is provided with a clearance opening 330 for avoiding the pressure relief mechanism 600.

[0123] For example, the pressure relief mechanism 600 may be a pressure relief component such as an explosion-proof valve, an explosion-proof disc, a gas valve, a pressure relief valve, or a safety valve.

[0124] In one feasible embodiment, a marking, such as a QR code or serial number, can be provided on the first wall 110 to facilitate identification of individual battery cells. Further, as... Figure 2 As shown, the first insulating member 300 is provided with a clearance opening 340 for a clearance marking. For example, the marking can be positioned close to the pressure relief mechanism 600 so that the clearance opening 340 communicates with the clearance opening 330, while ensuring the structural strength of the first insulating member 300.

[0125] In this embodiment, reference is made to Figure 4 and Figure 5 As shown, the first wall 110 is provided with a liquid injection hole 112. The liquid injection hole 112 can be located in the first exposed area 111 to reduce the openings on the first insulating member 300 and ensure the structural strength of the first insulating member 300.

[0126] This embodiment also provides a battery pack, which includes a pressure strip and the aforementioned battery cells. The pressure strip is bonded to the first exposed area 111. By bonding the pressure strip to the first exposed area 111 of the battery cell housing 100, the connection strength between the battery cell and the pressure strip is improved, thereby enhancing the integrated rigidity of the battery pack.

[0127] Specifically, the battery pack includes multiple battery cells, and a pressure strip adheres to the first exposed areas 111 of the multiple battery cells. Exemplarily, structural adhesive is filled into the second hole 312, and the pressure strip is used to bond the cells. The pressure strip adheres to the first exposed areas 111 of the multiple battery cells; that is, one pressure strip is used to bond to the first exposed areas 111 of the casing 100 of the multiple battery cells. In this embodiment, the multiple battery cells can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that some of the multiple battery cells are connected in series and others in parallel. The multiple battery cells can be directly connected in series, parallel, or in a mixed configuration together.

[0128] For example, multiple battery cells are arranged in an array to form at least one battery pack, each battery pack including at least two battery cells, facilitating the connection between the retaining strip and the battery cells. The first exposed area 111 is located on the shoulder of the battery cell, i.e., the retaining strip is adhered to the shoulder of the battery cell. Taking the housing 100 including a first wall 110 as an example, i.e., when the first wall 110 is a top cover, all battery cells in each column are arranged side-by-side along a third direction, each column of battery cells corresponds to two retaining strips, and the retaining strips extend along a third direction, i.e., the retaining strips extend along the arrangement direction of each column of battery cells, and the retaining strips are connected to the first wall 110 exposed in the first exposed area 111 of the corresponding column of battery cells. The third direction can be the width direction Z of the housing 100. Taking the outer casing 100 as an example, which includes two first walls 110, one of the first walls 110 can be a top cover and the other first wall 110 can be a bottom cover. Each row of battery cells is arranged side by side along the fourth direction, and each row of battery cells corresponds to two pressure strips. Both pressure strips extend along the arrangement direction of each row of battery cells. One pressure strip is used to connect with the first wall 110 exposed in the first exposed area 111 of the top cover, and the other pressure strip is used to connect with the first wall 110 exposed in the first exposed area 111 of the bottom cover. The fourth direction can be the width direction Z of the outer casing 100.

[0129] Optionally, the pressure strip is made of non-metallic material, such as rubber, plastic, or silicone. This type of pressure strip can achieve an insulated connection between the pressure strip and the battery cell, thereby reducing the risk of leakage or short circuit.

[0130] In this embodiment, the battery pack further includes a housing, a retaining strip, and individual battery cells disposed within the housing. In this embodiment, the retaining strip is adhered to the first exposed area 111 of the outer shell 100 of the individual battery cell to secure the individual battery cell to the housing, thereby effectively improving the connection strength between the individual battery cell and the retaining strip and enhancing the integrated rigidity of the battery pack.

[0131] In this embodiment, the housing can adopt various structures. In some embodiments, the housing may include a first housing body and a second housing body, which overlap each other, and together define an assembly space for accommodating the pressure strip and battery cells. The second housing body may be a hollow structure open at one end, and the first housing body may be a plate-like structure, with the first housing body covering the open side of the second housing body so that the first and second housing bodies together define the assembly space; alternatively, both the first and second housing bodies may be hollow structures open on one side, with the open side of the first housing body covering the open side of the second housing body. Of course, the housing formed by the first and second housing bodies can be of various shapes, such as a cylinder, a cuboid, etc. For example, the shape of the housing is a cuboid.

[0132] In some embodiments, the individual battery cells are placed upright inside the casing.

[0133] For example, taking the outer casing 100 as an example, the first wall 110 of the outer casing 100 is disposed facing the top of the box body, and the second wall of the outer casing 100 is disposed facing the bottom of the box body. The pressure strip is disposed between the first wall 110 and the top of the box body in the height direction X of the outer casing 100, and the pressure strip is bonded to the first exposed area 111 formed by the first wall 110.

[0134] For example, the housing 100 includes two first walls 110, one of which is disposed facing the bottom of the housing and the other is disposed facing the top of the housing.

[0135] In some embodiments, the battery cells may also be placed upside down inside the housing. For example, the housing 100 includes a first wall 110, the second wall of the housing 100 is disposed facing the top of the housing, and the first wall 110 of the housing 100 is disposed facing the bottom of the housing.

[0136] In this embodiment, regardless of whether the battery cell is placed upright or upside down inside the box, the first box body or the second box body can be a plate-like structure.

[0137] In this embodiment, the battery pack may also include other structures. For example, the battery pack may also include a busbar component for connecting multiple battery cells to achieve electrical connection between the multiple battery cells.

[0138] This embodiment also provides a vehicle, including a chassis and the aforementioned battery pack. The battery pack is mounted on the chassis and has good integrated rigidity, effectively ensuring the vehicle's electrical safety.

[0139] For example, the battery pack can be mounted on the chassis.

[0140] For example, the battery pack housing can be part of the chassis. For instance, a portion of the housing can be at least part of the floor of the chassis structure, or a portion of the housing can be at least part of the crossbeams and longitudinal beams of the chassis structure.

[0141] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0142] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cell, characterized by, The application relates to a battery, which comprises: a shell (100) comprising a first wall (110); an electrode terminal (200) arranged on the first wall (110); a first insulating member (300) attached to one side surface of the first wall (110) where the electrode terminal (200) is arranged; wherein the first insulating member (300) is provided with a first through hole (310) along the length direction of the shell (100), the first through hole (310) comprises a first hole part (311) and a second hole part (312), the electrode terminal (200) is arranged in the first hole part (311), and the first wall (110) forms a first exposed area (111) at the exposed part of the second hole part (312).

2. The battery cell of claim 1, wherein, The application further comprises a second insulating member (400) which wraps the surfaces of the walls of the shell (100) except the first wall (110).

3. The battery cell of claim 2, wherein, The second insulating member (400) is provided with a flange part (410) which is attached to one side surface of the first wall (110) where the electrode terminal (200) is arranged along the circumferential direction of the first wall (110); along the height direction of the shell (100), the flange part (410) is located between the first wall (110) and the first insulating member (300).

4. The battery cell of claim 3, wherein, The projection of the flange part (410) along the height direction of the shell (100) is located in the first insulating member (300); or part of the flange part (410) is exposed to the second hole part (312).

5. The battery cell of claim 1, wherein, The first insulating member (300) is provided with a reinforcing structure (320).

6. The battery cell of claim 5, wherein, The reinforcing structure (320) is arranged as a reinforcing rib or a reinforcing indentation.

7. The battery cell of claim 1, wherein, The first insulating member (300) is provided with a first reinforcing structure (321) which surrounds at least part of the first through hole (310).

8. The battery cell of claim 1, wherein, The first insulating member (300) is provided with a plurality of second reinforcing structures (322) which are arranged at intervals along the circumferential direction of the first through hole (310).

9. The battery cell of claim 1, wherein, The first insulating member (300) is provided with two third reinforcing structures (323) which are arranged at intervals along the length direction of the shell (100) or along the width direction of the shell (100), and the first through hole (310) is located between the two third reinforcing structures (323).

10. The battery cell of claim 9, wherein, At least one end of the third reinforcing structure (323) extends beyond the edge of the first through hole (310); and / or at least one end of the third reinforcing structure (323) is provided with an extension part (3231), and the extension part (3231) of one of the two third reinforcing structures (323) is arranged to extend towards the other.

11. The battery cell of claim 1, wherein, The electrode terminal (200) is sleeved with a third insulating member (500), a peripheral portion of the third insulating member (500) is provided with an extension portion (510), along the height direction of the shell (100), the extension portion (510) is located between the first wall (110) and the first insulating member (300), and part of the extension portion (510) is exposed from the second hole portion (312).

12. The battery cell of any one of claims 1-11, wherein, The shell (100) comprises one first wall (110), the first wall (110) is provided with two electrode terminals (200), and the two electrode terminals (200) are arranged at intervals along the length direction of the shell (100). Or the shell (100) comprises two first walls (110), the two first walls (110) are arranged at intervals along the height direction of the shell (100), each of the first walls (110) is provided with one electrode terminal (200), and the first insulating member (300) is provided with two first walls (110) and is arranged one by one corresponding to the two first walls (110).

13. The battery cell of any one of claims 1-11, wherein, The size of the second hole portion (312) along the width direction of the shell (100) is greater than or equal to the size of the first hole portion (311) along the width direction of the shell (100).

14. A battery pack, characterized by Comprise: The battery cell of any one of claims 1-13; A pressing strip is bonded to the first exposed area (111).

15. A vehicle characterized by comprising: A battery pack as claimed in claim 14 is arranged on a chassis. A battery pack as claimed in claim 14 is arranged on a chassis.

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