Battery cell, battery device, and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, an electrode assembly, an electrode terminal and an insulating part, and the shell is provided with an accommodating cavity and a first wall; the electrode assembly is at least partially accommodated in the accommodating cavity, and the electrode assembly comprises a main body part and a tab led out from the main body part; the electrode terminal is at least partially arranged on the first wall and is electrically connected with the tab; in the thickness direction of the first wall, at least part of the insulating part is arranged between the electrode terminal and the first wall; wherein the insulating part and the first wall are of an integrated structure, and a concave part is formed in the surface, deviating from the first wall, of the insulating part. According to the battery monomer provided by the embodiment of the invention, the concave part formed by injection molding is arranged on the surface deviating from the first wall, so that the fitting area between the insulating part and the first wall is further increased, the connection stability between the insulating part and the first wall is improved, and the insulating property between the electrode terminal and the first wall is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery monomer, a battery device and a power consumption device. BACKGROUND

[0002] With the development of new energy technology, batteries are applied more and more widely, such as in mobile phones, notebook computers, electric cars, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy ships, electric toy aircraft and electric tools.

[0003] Among them, the reliability of the battery monomer directly affects the reliability of the terminal product. Therefore, how to improve the reliability of the battery monomer is a continuous improvement technical problem in battery technology. CONTENT OF THE INVENTION

[0004] The present application provides a battery monomer, a battery device and a power consumption device, which can improve the insulation performance of the battery monomer, thereby improving the reliability of the battery monomer.

[0005] In a first aspect, the present application provides a battery monomer, which comprises a shell, an electrode assembly, an electrode terminal and an insulating piece, the shell has a receiving cavity and a first wall; the electrode assembly is at least partially accommodated in the receiving cavity, and the electrode assembly comprises a main body part and a tab led out from the main body part; the electrode terminal is at least partially arranged on the first wall and electrically connected with the tab; at least part of the insulating piece is arranged between the electrode terminal and the first wall in the thickness direction of the first wall; wherein the insulating piece and the first wall are an integral structure, and a concave part is formed on the surface of the insulating piece away from the first wall.

[0006] The battery monomer provided by the present application separates the electrode terminal and the first wall of the shell by the insulating piece to reduce the probability of short circuit and improve the use reliability of the battery monomer. Among them, the insulating piece can be combined with the first wall in an integral manner by injection molding to reduce the dislocation between the insulating piece and the shell. The insulating piece also sets the concave part formed by injection molding on the surface away from the first wall, further increasing the bonding area between the insulating piece and the first wall, to improve the connection stability between the insulating piece and the first wall and improve the insulation performance between the electrode terminal and the first wall.

[0007] In some optional embodiments, the insulating piece comprises a first subpart bonded with the first wall and a second subpart away from the first wall, and the concave part is located in the second subpart.

[0008] In the above optional embodiments, the concave part left by injection molding is formed in the second subpart not bonded with the first wall, to improve the injection molding quality of the first subpart bonded with the first wall, thereby improving the connection stability between the insulating piece and the first wall and improving the insulation performance of the battery monomer.

[0009] In some optional embodiments, the second sub-portion is provided with a through hole for accommodating the electrode terminal, the diameter of the second sub-portion is d1, the diameter of the through hole is d2, and the maximum size of the projection of the recess on the first wall is a, wherein a, d1 and d2 satisfy the relationship: a≤0.5(d1-d2).

[0010] In the above optional embodiments, the size of the recess in the radial direction of the second sub-portion can on the one hand enable the gate inside the mold to have sufficient flow to inject the injection material and improve the injection quality of the insulating part, and on the other hand can reduce the negative impact of the formation of the recess on the injection quality of the second sub-portion.

[0011] In some optional embodiments, the projection of the recess on the first wall is circular.

[0012] In the above optional embodiments, the gate inside the injection mold is circular to facilitate the injection material to flow into the mold more uniformly and form a circular recess, and the circular recess can reduce the cracking phenomenon due to stress concentration at the corners, further reducing the negative impact of the recess on the injection quality of the second sub-portion.

[0013] In some optional embodiments, the center of the recess is spaced apart from the center of the second sub-portion by d3, wherein along the radial direction of the second sub-portion, d3, d1 and d2 satisfy the relationship: d3=0.5(d1+d2)±0.2mm.

[0014] In the above optional embodiments, by adjusting the position of the gate inside the injection mold, the position of the recess on the second sub-portion can be correspondingly adjusted, so that the recess is as far away from the edge of the second sub-portion as possible, thereby reducing the negative impact of the recess on the injection quality of the second sub-portion.

[0015] In some optional embodiments, along the length direction of the first wall, the recess is arranged to deflect a first angle relative to the radius of the second sub-portion.

[0016] In the above optional embodiments, the recess can avoid the middle line position of the battery monomer in the thickness direction, thereby reducing the probability of cracking of the insulating part under the expansion of the battery monomer in the later stage and improving the reliability of the battery monomer.

[0017] In some optional embodiments, the deflection direction of the first angle is clockwise or counterclockwise, and the first angle is greater than or equal to 10° and less than or equal to 170°.

[0018] In the above optional embodiments, the first angle satisfies the above conditions to enable the recess to sufficiently avoid the middle line position of the battery monomer in the thickness direction, thereby reducing the probability of cracking of the insulating part under the expansion of the battery monomer.

[0019] In some optional embodiments, in the thickness direction of the first wall, the depth of the recess is less than or equal to 0.2mm.

[0020] In the optional embodiment, on one hand, the gate in the injection mold has sufficient depth to guide the injection material to flow into the mold sufficiently; on the other hand, the formation of the recess reduces the negative impact on the injection quality of the insulating part.

[0021] In some optional embodiments, the surface of the insulating part away from the first wall is further formed with an identification part, the identification part is arranged protruding relative to the surface of the insulating part away from the first wall, or the identification part is arranged recessed relative to the surface of the insulating part away from the first wall.

[0022] In the optional embodiment, the identification part can mark and classify the injection process of the insulating part, so as to trace the problem product in the later stage. The identification part is formed on the surface of the insulating part away from the first wall for easy observation, and the identification part is arranged in the form of protrusion or recess for easy molding at the same time of the injection processing of the insulating part.

[0023] In some optional embodiments, the identification part is arranged to be deflected by a second angle relative to the recess in the circumferential direction of the insulating part.

[0024] In the optional embodiment, the area where the recess is located is relatively thin in thickness and has relatively poor injection quality, so the identification part avoids the recess to reduce the negative impact of the identification part and the recess on the injection quality of the insulating part, and reduce the probability of cracking of the insulating part.

[0025] In some optional embodiments, the deflection direction of the second angle is clockwise or counterclockwise, and the second angle is greater than or equal to 30° and less than or equal to 150°.

[0026] In the optional embodiment, the second angle meets the above conditions, so that the identification part not only avoids the recess, but also avoids the position farthest from the recess on the insulating part, thereby reducing the probability of cracking of the insulating part.

[0027] In some optional embodiments, the identification part is arranged to be deflected by a third angle relative to the radius of the insulating part along the length direction of the first wall.

[0028] In the optional embodiment, the identification part simultaneously avoids the middle line position of the battery monomer in the thickness direction, further reducing the probability of cracking of the insulating part.

[0029] In some optional embodiments, the deflection direction of the third angle is clockwise or counterclockwise, and the third angle is greater than or equal to 10° and less than or equal to 170°.

[0030] In the optional embodiment, the third angle meets the above conditions, so that the recess sufficiently avoids the middle line position of the battery monomer in the thickness direction, thereby reducing the probability of cracking of the insulating part in the case of expansion of the battery monomer.

[0031] Secondly, this application provides a battery device, which includes a housing and a battery cell as provided in any embodiment of the first aspect, wherein the battery cell is housed within the housing.

[0032] Thirdly, this application provides an electrical device, which includes a battery device as provided in any embodiment of the second aspect, the battery device being used to provide electrical energy. Attached Figure Description

[0033] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0034] Figure 1 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the structure of a battery device according to an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the structure of a battery cell pack according to an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0038] Figure 5 This is a three-dimensional structural schematic diagram of an insulating component according to an embodiment of this application;

[0039] Figure 6 for Figure 5 A top view of the insulating component shown.

[0040] Figure 7 This is a three-dimensional structural schematic diagram of an insulating component according to an embodiment of this application;

[0041] Figure 8 for Figure 7 A top view of the insulating component shown.

[0042] Figure 9 This is a schematic diagram of the structure of the identification part according to an embodiment of this application;

[0043] Figure 10 This is a schematic diagram of the structure of the identification part according to an embodiment of this application.

[0044] The accompanying drawings are not necessarily drawn to scale.

[0045] The specific marking information in the attached diagram is as follows:

[0046] 1000, vehicles;

[0047] 100. Battery assembly; 200. Controller; 300. Motor;

[0048] 10, case; 11, first case portion; 12, second case portion;

[0049] 20, battery cell group; 21, battery cell;

[0050] 211, housing; 2111, first wall; 212, electrode assembly; 213, electrode terminal; 214, insulator; 2141, first sub-portion; 2142, second sub-portion; 215, recess; 216, identification portion;

[0051] first angle a; second angle β; third angle θ;

[0052] first wall length direction X; battery cell thickness direction Y. DETAILED DESCRIPTION

[0053] The embodiments of the present application will be described in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having," and any variations thereof, as used herein are intended to cover a non-exclusive inclusion.

[0055] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0056] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] In the description of the embodiments of the present application, the term "and / or" is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are an "or" relationship.

[0058] In the description of the embodiments of the present application, the term "a plurality of" means two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups), and "a plurality of pieces" means two or more pieces (including two pieces).

[0059] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0060] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0061] At present, from the development of market situation, the application of power battery and energy storage battery is more and more widely. Not only is it applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also is widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery and energy storage battery, the market demand is also increasing. At the same time, the reliability and safety of the battery are also attracting more and more attention.

[0062] As a core component of power batteries and energy storage batteries, the reliability of the battery cell directly affects the reliability of the battery. Generally, the shell of the battery cell is made of metal to obtain better mechanical properties, and the metal shell is insulated and spaced apart from the pole column of the battery cell by an upper plastic part. However, the upper plastic part is prone to dislocation with the shell during assembly, affecting the insulation performance between the pole column and the shell, and even causing short circuit.

[0063] To solve the above problems, the battery cell provided in the embodiments of the present application is provided, which integrates the insulating part and the shell, and improves the structure of the insulating part to improve the insulation performance of the insulating part and the reliability of the battery cell.

[0064] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0065] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0066] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft package battery cell or other shaped battery cell. The prismatic battery cell includes a square cell, a blade-shaped battery cell, a multi-prismatic battery, such as a hexagonal prismatic battery, etc. The present application is not particularly limited.

[0067] In some embodiments, the battery cell can include a shell. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the shell can be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell serves to protect the electrode assembly, and the shell and the electrode assembly further include a sealing bag for packaging the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating part or an aluminum-plastic film. When the shell is a sealed structure, it is used to package the electrode assembly and the electrolyte, etc.

[0068] In some embodiments, the shell includes an end cap and a shell body, and the shell body is provided with an opening, and the end cap is provided on the opening. The shell body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0069] The scheme of the embodiments of the present application can be applied to, but is not limited to, a battery device including a battery cell, and can also be applied to a power consumption device including a battery cell and a battery device.

[0070] The application provides a power consumption device using a battery device as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0071] The following embodiments are described by taking a power consumption device of an embodiment of the application as a vehicle 1000 for example for convenience of description.

[0072] Please refer to Figure 1 , Figure 1 A structural schematic diagram of the vehicle 1000 provided by some embodiments of the application is shown. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile. The vehicle 1000 is internally provided with a battery device 100. The battery device 100 can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0073] In some embodiments of the application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0074] The battery device 100 mentioned in the embodiments of the application can include one or more battery cell groups 20 for providing voltage and capacity. The battery cell group can include a plurality of battery cells connected in series, in parallel, or in a mixed manner through a busbar component.

[0075] In some embodiments, the battery cell group is usually formed by arranging a plurality of battery cells; as an example, the battery cell group can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by binding a plurality of battery cells by a cable tie.

[0076] In some embodiments, the battery device 100 can be a battery pack including a box body and one or more battery cell groups 20 accommodated in the box body.

[0077] Please refer to Figure 2 ,Figure 2 A schematic diagram of a battery device 100 according to some embodiments of the present application is shown in FIG. 1. The battery device 100 includes a box 10 and a battery cell group 20, which is accommodated in the box 10.

[0078] The box 10 is used to accommodate battery cells. The box 10 can have various structures. In some embodiments, the box 10 can include a first box part 11 and a second box part 12, which are mutually coverable. The first box part 11 and the second box part 12 together define an accommodation part for accommodating the battery cell group 20. The second box part 12 can be a hollow structure with one open end, and the first box part 11 can be a plate structure, which is coverable to the open end of the second box part 12 to form the box 10 with the accommodation part. Alternatively, the first box part 11 and the second box part 12 can both be hollow structures with one open end, and the open end of the first box part 11 is coverable to the open end of the second box part 12 to form the box 10 with the accommodation part. Of course, the first box part 11 and the second box part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0079] As an example, the battery cell group 20 can be a battery module, which can be accommodated in the box by fixing the battery module in the box.

[0080] As an example, the battery cell group 20 can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0081] In some embodiments, the box can be part of a chassis structure of a vehicle 1000. For example, part of the box can be at least part of a floor of the vehicle 1000, or part of the box can be at least part of a cross beam and a longitudinal beam of the vehicle 1000.

[0082] In some embodiments, the battery device 100 can be an energy storage device. The energy storage device can include an energy storage container, an energy storage cabinet, etc.

[0083] Please refer to Figure 3 , Figure 3 A schematic diagram of a battery cell group 20 according to some embodiments of the present application is shown in FIG. 2. The battery cell group 20 includes a plurality of battery cells 21, which are first connected in series or in parallel or in a mixed connection to form the battery cell group 20, and then the battery cell group 20 is accommodated in a box.

[0084] Please refer to Figure 4 to Figure 10 , Figure 4 A schematic diagram of a battery cell according to some embodiments of the present application is shown in FIG. 3. Figure 5 A schematic diagram of an insulating member according to some embodiments of the present application is shown in FIG. 4. Figure 6 A schematic diagram of a battery device according to some embodiments of the present application is shown in FIG. 5. Figure 5A top view of the insulating member shown in the figure; Figure 7 A perspective view of the insulating member according to an embodiment of the present application;

[0085] Figure 8 A perspective view of the insulating member shown in the figure; Figure 7 A top view of the insulating member shown in the figure; Figure 9 A perspective view of the identification part according to an embodiment of the present application; Figure 10 A perspective view of the identification part according to an embodiment of the present application.

[0086] In the first aspect, referring to Figure 4 The battery monomer 21 provided by the embodiment of the present application comprises a shell 211, an electrode assembly 212, an electrode terminal 213 and an insulating member 214. The shell 211 has a containing cavity and a first wall 2111. The electrode assembly 212 is at least partially contained in the containing cavity. The electrode terminal 213 is at least partially arranged on the first wall 2111 and electrically connected with the electrode assembly 212. In the thickness direction of the first wall 2111, at least part of the insulating member 214 is arranged between the electrode terminal 213 and the first wall 2111. The insulating member 214 and the first wall 2111 are in an integrated structure. The surface of the insulating member 214 away from the first wall 2111 is provided with a recess 215.

[0087] The electrode assembly 212 comprises a main body part and a tab led out from the main body part. The electrode terminal 213 is electrically connected with the tab to lead out current from the main body part. The tab comprises a positive tab and a negative tab. The electrode terminal 213 can be directly connected with the tab or indirectly connected with the tab through a current collecting member. The main body part comprises a positive electrode, a negative electrode and a separator. The separator is arranged between the negative electrode and the positive electrode. In the charging and discharging process of the battery monomer 21, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator can prevent the short circuit of the positive electrode and the negative electrode and at the same time meet the passing of the active ions.

[0088] The insulating member 214 refers to a member made of insulating material for spacing the electrode terminal 213 and the first wall 2111 of the shell 211. Exemplarily, the material of the insulating member 214 comprises at least one of polyvinyl chloride, polystyrene, polycarbonate and polytetrafluoroethylene, so as to be prepared by a processing mode of injection molding.

[0089] In the battery monomer 21 provided by the embodiment of the present application, the insulating member 214 and the first wall 2111 are in an integrated structure. The first wall 2111 can be pre-embedded in an injection mold so as to become an integrated structure with the insulating member 214 in the preparation process of the insulating member 214. Thus, the insulating member 214 can be stably combined with the first wall 2111 to reduce the dislocation, thereby realizing the improvement of the insulation performance and the reliability of the battery monomer 21.

[0090] Specifically, the injection molding process includes cold runner injection molding and hot runner injection molding, and compared with the cold runner injection molding, the hot runner injection molding can greatly reduce the condensed material and shorten the molding cycle. In the battery monomer 21 provided by the embodiment of the application, the insulating part 214 is formed by the hot runner injection molding process to improve the insulation quality of the insulating part 214. However, for the insulating part 214 in the battery monomer 21, the thickness is relatively thin, and the product surface will inevitably leave a recess 215, and the thickness of the area where the recess 215 is located is further thinned, and the mechanical properties and insulation properties are relatively weak.

[0091] To this end, the application sets the recess 215 formed by the hot injection molding on the surface of the insulating part 214 away from the first wall 2111 through the mold design, which helps the surface of the insulating part 214 close to the first wall 2111 to adhere to the first wall 2111, increases the adhesion area to improve the stability of the connection between the insulating part 214 and the first wall 2111, and further improves the insulation performance between the electrode terminal 213 and the first wall 2111.

[0092] According to some embodiments of the application, please refer to Figure 5 , the insulating part 214 includes a first subpart 2141 adhering to the first wall 2111 and a second subpart 2142 away from the first wall 2111, and the recess 215 is formed in the second subpart 2142.

[0093] Optionally, the second subpart 2142 is located in the first subpart 2141 in the first wall 2111 orthographic projection; in other words, the size of the first subpart 2141 is greater than that of the second subpart 2142, so as to further increase the contact area between the first subpart 2141 and the first wall 2111 and improve the insulation performance of the battery monomer 21.

[0094] Therefore, the recess 215 is arranged on the second subpart 2142 away from the first wall 2111 to reduce the negative impact of the recess 215 on the stability of the connection between the insulating part 214 and the first wall 2111, so that the first subpart 2141 directly adhering to the first wall 2111 has a more uniform thickness and a better injection molding quality, and further improves the insulation performance of the insulating part 214 and the battery monomer 21.

[0095] According to some embodiments of the application, the second subpart 2142 is provided with a through hole for accommodating the electrode terminal 213, the diameter of the second subpart 2142 is d1, the diameter of the through hole is d2, and the maximum size of the recess 215 in the first wall 2111 orthographic projection is a, wherein a, d1 and d2 satisfy the relationship: a≤0.5(d1-d2).

[0096] Optionally, in some embodiments, the outer edge of the second subpart 2142 away from the through hole is chamfered or rounded, and in this case, the minimum diameter of the second subpart 2142 is d1.

[0097] Optionally, in some embodiments, a larger gate is reserved in the injection mold for forming the insulation piece 214 to increase the injection flow, so that the injection material can flow into the mold faster and more uniformly, and a and d1, d2 satisfy the relationship: a≥0.25(d1-d2).

[0098] Optionally, the diameter of the second sub-part 2142 is less than or equal to 22 mm.

[0099] Optionally, the diameter of the through hole is less than or equal to 14 mm.

[0100] In this way, by limiting the size of the recess 215, the negative impact of the formation of the recess 215 on the injection quality of the second sub-part 2142 is reduced, while meeting the requirements of thermoplastic processing, so that the gate of the mold has sufficient flow to improve the injection quality and reduce internal defects.

[0101] According to some embodiments of the present application, the orthographic projection of the recess 215 on the first wall 2111 is circular.

[0102] It can be understood that the circular shape referred to herein includes a perfect circle and an approximate circle, such as an ellipse.

[0103] In this way, the shape of the recess 215 can be adjusted synchronously by adjusting the shape of the gate of the injection mold. By limiting the shape of the recess 215, the negative impact of the formation of the recess 215 on the injection quality of the second sub-part 2142 and the insulation piece 214 is further reduced. It can be understood that the circular recess 215 can reduce the risk of cracking due to stress concentration at the corners of the subsequent insulation piece 214 when it is extruded, while improving the flowability and smoothness of the product to the gate of the injection mold.

[0104] According to some embodiments of the present application, the center of the recess 215 is spaced apart from the center of the second sub-part 2142 by a distance d3, wherein along the radial direction of the second sub-part 2142, d3 and d1, d2 satisfy the relationship: d3=0.5(d1+d2)±0.2 mm.

[0105] It can be understood that the allowable deviation in the above relationship can be adjusted according to the actual production needs. Specifically, the allowable deviation can be adjusted higher according to the increase of d1, d2, or adjusted lower according to the decrease of d1, d2.

[0106] The adjustment of the position of the recess 215 can be achieved by adjusting the position of the gate in the injection mold. In this way, the recess 215 is as far away from the edge of the second sub-part 2142 as possible, so as to reduce the negative impact of the recess 215 on the injection quality of the second sub-part 2142.

[0107] According to some embodiments of the present application, please refer toFigure 6 The recess 215 is arranged at a first angle a relative to the radius of the second sub-portion 2142 along the length direction of the first wall 2111 (e.g. the X direction in the figure).

[0108] During the use of the battery cell 21, the electrode assembly 212 will inevitably expand with the increase of the charge and discharge times. The expansion will cause the shell 211 to be pressed and deformed correspondingly. Therefore, the insulating member 214 integrally connected with the first wall 2111 by injection molding is prone to cracking due to the deformation of the first wall 2111.

[0109] In the above embodiment, the recess 215 deflecting at the first angle a can make the area with relatively weak mechanical properties of the insulating member 214 avoid the center line of the battery cell 21 in the thickness direction (e.g. the Y direction in the figure), thereby reducing the probability of the insulating member 214 cracking under stress when the battery cell 21 expands later, and improving the insulation performance and reliability of the battery cell 21.

[0110] According to some embodiments of the present application, the deflection direction of the first angle a is clockwise or counterclockwise, and the first angle a is greater than or equal to 10° and less than or equal to 170°.

[0111] It can be understood that the first angle a deflects in the plane parallel to the first wall 2111 where the second sub-portion 2142 forms the recess 215.

[0112] In this way, the area with relatively weak mechanical properties where the recess 215 is located sufficiently avoids the position of the first wall 2111 prone to deformation due to expansion, further reducing the probability of the insulating member 214 cracking under the expansion of the battery cell 21.

[0113] According to some embodiments of the present application, in the thickness direction of the first wall 2111, the depth of the recess 215 is less than or equal to 0.2 mm.

[0114] The adjustment of the depth of the recess 215 can be achieved by adjusting the height of the sprue in the injection mold. In this way, while the sprue in the injection mold has sufficient depth to guide the injection material to flow sufficiently into the mold, the formation of the recess 215 reduces the negative impact on the injection quality of the insulating member 214.

[0115] According to some embodiments of the present application, please refer to Figure 7 The insulating member 214 further forms an identification portion 216, and the identification portion 216 is located on the surface of the insulating member 214 away from the first wall 2111.

[0116] The injection molded product can mark information such as a mold cavity number, a production date, etc. on the insulating piece 214 through the identification part 216, which helps to trace the problem product later. In related products, the mold cavity number is generally arranged on the side of the insulating piece 214 that is attached to the shell 211, and the mold cavity number needs to be exposed by cutting or other methods for later traceability, which causes loss and even leads to product scrapping.

[0117] In the above embodiments, the identification part 216 is arranged on the surface of the insulating piece 214, so that it can be directly observed, reducing the traceability loss and the difficulty of traceability.

[0118] Optionally, referring to Figure 9 and Figure 10 , the identification part 216 is arranged protruding relative to the surface of the first wall 2111 or recessed relative to the surface of the first wall 2111 on the second sub-part 2142. Thus, the identification part 216 can be formed at the same time as the insulating piece 214 to shorten the marking time.

[0119] According to some embodiments of the present application, referring to Figure 8 , the identification part 216 is arranged to be deflected by a second angle β relative to the recess 215 in the circumferential direction of the second sub-part 2142.

[0120] It can be understood that the thickness of the area where the identification part 216 is arranged is correspondingly thickened or thinned, and there is a difference in mechanical properties with the surrounding area. When the insulating piece 214 is stressed, the identification part 216 (especially the identification part 216 arranged in recess) is more likely to cause stress concentration and cracking, affecting the overall reliability of the insulating piece 214.

[0121] Thus, by deflecting the second angle β, the two areas with relatively weak mechanical properties of the identification part 216 and the recess 215 can be staggered with each other, to reduce the negative impact of setting the recess 215 and setting the identification part 216 on the injection molding quality of the insulating piece 214, and reduce the probability of cracking of the insulating piece 214.

[0122] According to some embodiments of the present application, the deflection direction of the second angle β is clockwise or counterclockwise, and the second angle β is greater than or equal to 30° and less than or equal to 150°.

[0123] It can be understood that the second angle β is deflected in the plane parallel to the first wall 2111 where the recess 215 is formed on the second sub-part 2142.

[0124] Optionally, the deflection direction of the second angle β is the same as the deflection direction of the first angle α, so that the area where the identification part 216 is arranged can simultaneously avoid the middle line position in the thickness direction of the battery monomer 21.

[0125] Therefore, the area where the concave part 215 is located and the area where the identification part 216 is located can be fully staggered, so as to further reduce the probability of cracking of the insulating part 214.

[0126] According to some embodiments of the present application, the identification part 216 is arranged to deflect a third angle θ relative to the radius of the second sub-part 2142 along the length direction of the first wall 2111.

[0127] Therefore, the area where the identification part 216 is located and the area where the identification part 216 is located can be fully staggered, so as to further reduce the probability of cracking of the insulating part 214.

[0128] According to some embodiments of the present application, the deflection direction of the third angle θ is clockwise or counterclockwise, and the third angle θ is greater than or equal to 10° and less than or equal to 170°.

[0129] It can be understood that the third angle θ deflects in the plane parallel to the first wall 2111 where the second sub-part 2142 forms the identification part 216.

[0130] Optionally, the deflection direction of the first angle α and the third angle θ is opposite.

[0131] Therefore, the area where the identification part 216 is located and the area where the identification part 216 is located can be fully staggered, so as to further reduce the probability of cracking of the insulating part 214.

[0132] In a second aspect, the embodiments of the present application provide a battery device, which comprises a box body and at least one battery monomer 21 provided by any of the embodiments of the first aspect, and the battery monomer 21 is accommodated in the box body.

[0133] In a third aspect, the embodiments of the present application provide a power consumption device, which comprises a battery device provided by any of the embodiments of the second aspect, and the battery device is used to provide electric energy.

[0134] Please refer to Figure 4 , Figure 7 and Figure 8The battery monomer 21 provided by the embodiments of the present application comprises an outer shell 211, an electrode assembly 212, an electrode terminal 213 and an insulating piece 214. The electrode assembly 212 is accommodated in the outer shell 211 and is electrically connected with the electrode terminal 213. The electrode terminal 213 is arranged on the first wall 2111 and is spaced apart from the first wall 2111 by the insulating piece 214. The insulating piece 214 is formed in an integral structure with the first wall 2111 of the outer shell 211 by a hot runner injection molding process. The recess 215 formed by injection molding is arranged on the surface away from the first wall 2111 by adjusting the position of the mold gate, so as to improve the connection stability of the insulating piece 214 and the first wall 2111. The recess 215 is arranged to be deflected by a first angle a relative to the middle line position of the battery monomer 21 in the thickness direction, so as to form an avoidance.

[0135] The insulating piece 214 is further formed with an identification part 216 on the surface away from the first wall 2111. The identification part 216 is deflected by a second angle β relative to the recess 215, and is also deflected by a third angle θ relative to the middle line position of the battery monomer 21 in the thickness direction. Therefore, the identification part 216 is dislocated from the area where the recess 215 is located and the easily deformed area of the first wall 2111 due to stress expansion, so as to reduce the probability of cracking of the insulating piece 214 during use, and further improve the reliability of the battery monomer 21.

[0136] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery cell, comprising: a housing having a receiving cavity and a first wall; an electrode assembly at least partially accommodated in the receiving cavity, the electrode assembly comprising a main body and a tab led out from the main body; an electrode terminal at least partially arranged on the first wall and electrically connected with the tab; an insulating piece at least partially arranged between the electrode terminal and the first wall in the thickness direction of the first wall; wherein the insulating piece and the first wall are in an integral structure, and a surface of the insulating piece away from the first wall is formed with a recess.

2. The battery cell of claim 1, wherein, The insulating piece comprises a first sub-piece abutting the first wall and a second sub-piece away from the first wall, and the recess is located on the second sub-piece.

3. The battery cell of claim 2, wherein, The second sub-piece is provided with a through hole for accommodating the electrode terminal, the diameter of the second sub-piece is d1, the diameter of the through hole is d2, and the maximum size of the projection of the recess on the first wall is a, wherein a, d1 and d2 satisfy the relationship: a <= 0.5 (d1-d2).

4. The battery cell of claim 3, wherein, The projection of the recess on the first wall is circular.

5. The battery cell of claim 4, wherein, The center of the recess is arranged at a distance d3 from the center of the second sub-piece, wherein along the radial direction of the second sub-piece, d3, d1 and d2 satisfy the relationship: d3 = 0.5 (d1+d2) + / - 0.2 mm.

6. The battery cell of claim 3, wherein, Along the length direction of the first wall, the radius of the recess is arranged at a first angle relative to the second sub-piece.

7. The battery cell of claim 6, wherein, The deflection direction of the first angle is clockwise or counterclockwise, and the first angle is greater than or equal to 10 degrees and less than or equal to 170 degrees.

8. The battery cell of claim 2, wherein, In the thickness direction of the first wall, the depth of the recess is less than or equal to 0.2 mm.

9. The battery cell of claim 1, wherein, The surface of the insulating piece away from the first wall is further formed with an identification part, the identification part is arranged in protrusion relative to the surface of the insulating piece away from the first wall, or the identification part is arranged in recess relative to the surface of the insulating piece away from the first wall.

10. The battery cell of claim 9, wherein, Along the circumferential direction of the insulating piece, the identification part is arranged at a second angle relative to the recess.

11. The battery cell of claim 10, wherein, The deflection direction of the second angle is clockwise or counterclockwise, and the second angle is greater than or equal to 30 degrees and less than or equal to 150 degrees.

12. The battery cell of claim 10, wherein, Along the length direction of the first wall, the identification part is arranged at a third angle relative to the radius of the insulating piece.

13. The battery cell of claim 12, wherein, The deflection direction of the third angle is clockwise or counterclockwise, and the third angle is greater than or equal to 10 degrees and less than or equal to 170 degrees.

14. A battery device characterized by comprising: The application further relates to a battery device comprising at least one battery cell as claimed in any one of claims 1 to 13, and a battery apparatus for providing electric energy as claimed in claim 14.

15. An electrical device, comprising: ​

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