Battery cell, battery and electrical device

Abstract

A battery cell (21), a battery (100), and an electrical device. The battery cell (21) comprises: a casing (211), the casing (211) being provided with a setting wall (212), the setting wall (212) being provided with a pressure relief part (213) and first adhesive coating parts (214), and the first adhesive coating parts (214) being arranged on two opposite sides of the pressure relief part (213); an electrode assembly (22), the electrode assembly (22) being provided in the casing (211); and an electrode terminal (23), the electrode terminal (23) being provided on the casing (211) and being electrically connected to the electrode assembly (22).

Description

Battery cells, batteries and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202311608062.6, application date November 27, 2023, and name “Battery Cell, Battery and Electrical Equipment”, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries play an irreplaceable and important role as the power source of electric vehicles. The battery consists of a casing and multiple battery cells housed within the casing. As a core component of new energy vehicles, batteries have high requirements for both safety and service life. The battery cells within the battery generate a large amount of heat during continuous charging and discharging. In related technologies, a pressure relief unit can be installed in the battery cell to relieve pressure in the event of thermal runaway of the battery cell, resulting in poor reliability of the battery cell.

[0005] Summary of the Invention

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery cell, a battery, and an electrical device that can effectively reduce damage to the pressure relief portion when the electrode assembly expands, thereby ensuring the safety and reliability of the battery cell.

[0007] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell having a set wall, on which a pressure relief portion and a first glue coating portion are provided, and the first glue coating portion is provided on opposite sides of the pressure relief portion; an electrode assembly, the electrode assembly is provided in the shell; and electrode terminals, the electrode terminals are provided on the shell and electrically connected to the electrode assembly.

[0008] In the above technical solution, by providing the above-mentioned battery cell, first adhesive portions are provided on both sides of the battery cell located along the first direction of the pressure relief portion. Thus, after the battery cell is installed in the casing, the setting wall is bonded to the inner wall of the casing via the two first adhesive portions, thereby securing the setting wall relative to the inner bottom wall of the casing. In this way, when the electrode assembly undergoes long-term charging and discharging and internal expansion occurs, the bonding of the setting wall to the casing via the first adhesive portions can reduce deformation of the setting wall, i.e., the wall where the pressure relief portion is located, as the electrode assembly expands. This can further reduce damage to the pressure relief portion, reduce the probability of leakage from the pressure relief portion, and improve the stability and reliability of the battery cell.

[0009] In some embodiments, the setting wall has a first direction, the first glue coating portion extends along the first direction, and in the first direction, the size of the pressure relief portion is L1, and the size of the first glue coating portion is L2, wherein 1.0≤L2 / L1≤2.0.

[0010] In the above technical solution, the length of the first adhesive portion along the first direction is set to be greater than the length of the pressure relief portion along the first direction, so that the first adhesive portion can cover various areas on both sides of the pressure relief portion in the first direction, thereby facilitating the enhancement of the bonding effect of the first adhesive portion on both sides of the pressure relief portion. It is understandable that during actual installation, the set wall is bonded and fixed to the inner wall of the battery case by the first adhesive portion on both sides of the pressure relief portion along the first direction, and the length of the adhesive area along the first direction is greater than the extension length of the pressure relief portion, so that the adhesive area can fully cover the pressure relief portion from both sides. In this way, the force transmitted to the set wall when the electrode assembly expands can be maximized and absorbed by the first adhesive portions on both sides, reducing the force transmitted to the pressure relief portion through the uncovered area, thereby enhancing the protection effect of the pressure relief portion and improving the safety of the battery cell.

[0011] In some embodiments, L2 / L1 ≤ 1.5.

[0012] In this technical solution, the extension length of the first glue coating portion along the first direction is not only greater than the pressure relief portion but also closer to the pressure relief portion. This allows the first glue coating portion to not only utilize the bonding effect to structurally strengthen the areas on both sides of the pressure relief portion, but also reduce the waste of the glue coating area caused by the excessive length of the first glue coating portion. At the same time, it can also reduce the occupation of the bonding space while ensuring the bonding strength.

[0013] In addition, it can be understood that after bonding through the first glue coating part, not only the safety of the pressure relief part needs to be ensured, but also the excessive adhesion caused by the first glue coating part needs to be reduced, that is, the first glue coating part will not be bonded to the entire surface of the set wall, so that the set wall can absorb the expansion force generated by the electrode assembly to a certain extent while ensuring the safety of the pressure relief part, reduce excessive extrusion inside the electrode assembly, and improve the rationality of the overall setting.

[0014] In some embodiments, the set wall has a first direction and a second direction, the first glue coating portion extends along the first direction, the second direction is perpendicular to the first direction, and in the second direction, the size of the pressure relief portion is W1, and the size of the first glue coating portion is W2, wherein 0.3≤W2 / W1≤1.0.

[0015] In the above technical solution, setting the dimensions of the first adhesive coating portion and the pressure relief portion in the second direction within the above-mentioned range ensures that the width of the first adhesive coating portion is not too small, thereby ensuring sufficient bonding area between the set wall and the inner wall of the box, improving the bonding stability between the two, and effectively reducing deformation of the set wall in the area where the pressure relief portion is located. At the same time, the coating area of ​​the first adhesive coating portion is not excessively large, reducing adhesive waste, and a deformation area is reserved outside the first adhesive coating portion to achieve expansion and collapse while ensuring the safety of the pressure relief portion, thereby improving the internal safety of the battery cell.

[0016] In some embodiments, 0.4≤W2 / W1≤0.7.

[0017] In the above technical solution, the width of the first adhesive coating portion can be further ensured not to be too small, thereby ensuring sufficient bonding area between the set wall and the inner wall of the box, improving the bonding stability between the two, and effectively reducing deformation of the set wall in the area where the pressure relief portion is located. Similarly, the coating area of ​​the first adhesive coating portion is not excessively large, reducing adhesive waste, and a deformation area is reserved outside the first adhesive coating portion to achieve expansion and collapse while ensuring the safety of the pressure relief portion, thereby improving the internal safety of the battery cell.

[0018] In some embodiments, a non-glue coated portion is provided on the setting wall, and the non-glue coated portion is provided on a side of the first glue coated portion away from the pressure relief portion.

[0019] In the above technical solution, a blank glue overflow area can be formed on the outside of the first glue coating part by setting a non-glue coating part. In other words, when the first glue coating part is glued and the battery cell is installed in the box, the adhesive at the first glue coating part can overflow toward the non-glue coating part due to the installation extrusion force, that is, the adhesive at the first glue coating part will not overflow from the set wall during the installation process, thereby reducing the overflow of the adhesive to other areas.

[0020] In addition, the non-glue-coated part can be an area where the set wall is not bonded to the inner wall of the box. This area is separated from the pressure relief part, and the force applied to it will not directly act on the pressure relief part. It can absorb part of the expansion force from the inside of the electrode assembly, thereby reducing damage to the pressure relief part, reducing the internal pressure of the electrode assembly, and improving the safety of the battery cell.

[0021] In some embodiments, the set wall has a first direction and a second direction, the first glue-coated portion extends along the first direction, the second direction is perpendicular to the first direction, and in the second direction, the size of the non-glue-coated portion is W3, and the size of the set wall is W0, wherein 0.05≤W3 / W0≤0.2.

[0022] In the above technical solution, by setting the dimensions of the non-glue-coated portion and the set wall in the second direction within the above range, the width of the non-glue-coated portion is not too small, thereby ensuring sufficient space for glue overflow outside the first glue-coated portion, thereby achieving effective glue overflow at the first glue-coated portion. Of course, the width of the non-glue-coated portion is not too large, reducing the space occupied by the non-glue-coated portion, balancing the width of the first glue-coated portion, and ensuring reliable bonding.

[0023] In some embodiments, 0.08≤W3 / W0≤0.15.

[0024] In the above technical solution, setting the dimensions of the non-glue-coated portion and the set wall in the second direction within the above range further ensures that the width of the non-glue-coated portion is not too small, thereby ensuring sufficient space for glue overflow outside the first glue-coated portion, thereby achieving effective glue overflow at the first glue-coated portion. Similarly, the width of the non-glue-coated portion is not too large, reducing the space occupied by the non-glue-coated portion, balancing the width of the first glue-coated portion, and ensuring reliable bonding.

[0025] In some embodiments, a first gap is formed between the first glue coating portion and the pressure relief portion, the setting wall has a first direction and a second direction, the first glue coating portion extends along the first direction, the second direction is perpendicular to the first direction, and in the second direction, the size of the first gap is h1, where 3mm≤h1≤15mm.

[0026] In the above technical solution, by providing a first gap, sufficient space for glue overflow is ensured inside the first glue coating portion, thereby achieving effective glue overflow at the first glue coating portion. Thus, the glue overflow space is formed on both the inside and outside of the first glue coating portion, which not only reduces the amount of adhesive from the first glue coating portion that overflows outside the designated wall, but also reduces the amount of adhesive from the first glue coating portion that overflows inward toward the pressure relief portion, thereby reducing the risk of adhesive overflow reinforcing the notch and ensuring the reliability of the pressure relief portion.

[0027] In some embodiments, the setting wall has a first direction and a second direction, the first rubber coating portion extends along the first direction, the second direction is perpendicular to the first direction, and in the second direction, one of the two opposite edges of the first rubber coating portion is connected to the edge of the setting wall, and the other is connected to the edge of the pressure relief portion.

[0028] In the second direction, one of the two opposing edges of the first adhesive portion is in contact with the edge of the setting wall, and the other is in contact with the edge of the pressure relief portion. That is, in the second direction, the first adhesive portion is located in an area of ​​the setting wall excluding the pressure relief portion. In other words, the width of the first adhesive portion along the second direction is the same as the spacing between the edge of the setting wall and the edge of the pressure relief portion, so that both sides of the setting wall along the second direction of the pressure relief portion are adhesive areas of the first adhesive portion. This increases the area of ​​the adhesive region of the setting wall outside the pressure relief portion, improves the adhesive stability between the setting wall and the housing, and further reduces the impact of internal expansion of the electrode assembly on the pressure relief portion.

[0029] In some embodiments, the setting wall has a first direction and a second direction, the first glue-coated portion extends along the first direction, the second direction is perpendicular to the first direction, and a non-glue-coated portion is provided on the setting wall. The non-glue-coated portion is provided on the side of the first glue-coated portion away from the pressure relief portion. In the second direction, the size of the first glue-coated portion is W2, and the size of the non-glue-coated portion is W3, wherein 0.4≤W3 / W2≤1.0.

[0030] In the above technical solution, by setting the size of the first adhesive coating portion to the set wall within the above-mentioned ratio range, the size of the first adhesive coating portion can be made sufficiently large, ensuring that the bonding force between the first adhesive coating portion and the box body can ensure stability in the area where the pressure relief portion is located. At the same time, the width of the first adhesive coating portion is not made too large, leaving sufficient installation space for the pressure relief portion in the second direction, thereby achieving reasonable installation of the pressure relief portion.

[0031] In some embodiments, 0.6≤W3 / W2≤0.8.

[0032] In the above technical solution, by setting the size of the first adhesive coating portion to the set wall within the above-mentioned ratio range, the size of the first adhesive coating portion can be further increased to be sufficiently large, ensuring that the bonding force between the first adhesive coating portion and the box body can ensure stability in the area where the pressure relief portion is located. At the same time, the width of the first adhesive coating portion is not excessively large, leaving sufficient installation space for the pressure relief portion in the second direction, thereby achieving reasonable installation of the pressure relief portion.

[0033] In some embodiments, the setting wall has a second glue-coated portion, and the second glue-coated portion is located on the other two opposite sides of the pressure relief portion.

[0034] In some embodiments, the setting wall has a first direction and a second direction, the first glue coating portion extends along the first direction, the second direction is perpendicular to the first direction, and the second glue coating portion extends along the second direction.

[0035] In the above technical solution, by setting the first glue coating part and the second glue coating part, the first glue coating part and the second glue coating part are coordinated and distributed around the pressure relief part. In this way, when the battery cell is installed in the battery box, the pressure relief part is bonded and fixed to the inner wall of the box at multiple positions on the circumference to form an annular bonding area, so that when an expansion force is generated inside the electrode assembly, the expansion force can be transmitted to the box through the adhesive from any position on the circumference of the pressure relief part, and will not directly act on the area where the pressure relief part is located, thereby reducing the structural deformation of the pressure relief part caused by the expansion force, reducing the risk of notching and cracking, and improving the safety and reliability of the installation of the pressure relief part.

[0036] In some embodiments, in the first direction, a size of the second adhesive coating portion is L3, and a size of the pressure relief portion is L1, wherein 0.15≤L3 / L1≤1.5.

[0037] In the above technical solution, the length of the second adhesive coating portion along the first direction can be set to be the same as the length of the pressure relief portion along the first direction, or the length of the second adhesive coating portion along the first direction can be made smaller than the length of the pressure relief portion along the first direction, thereby enhancing the bonding effect of the second adhesive coating portion on both sides of the pressure relief portion. It is understandable that during actual installation, the wall is set to be bonded and fixed to the inner wall of the battery box through the second adhesive coating portion on both sides of the pressure relief portion along the second direction, and the above ratio is set to be greater than or equal to 0.15, which can ensure that the bonding area between the second adhesive coating portion and the box can generate an effective bonding force on both sides of the pressure relief portion in the second direction, thereby improving the connection stability between the two, and the ratio of the two is set to be less than or equal to 1.5, which can reduce the waste of adhesive caused by the excessive area of ​​the second adhesive coating portion, thereby achieving a reasonable setting of the structural dimensions.

[0038] In some embodiments, a second gap is formed between the second glue coating portion and the pressure relief portion. In the first direction, a size of the second gap is h2, wherein 3 mm ≤ h2 ≤ 15 mm.

[0039] In the above technical solution, by setting a second gap, it is ensured that there is sufficient space for glue overflow on the inner side of the second glue coating part, thereby achieving effective glue overflow at the second glue coating part, which can reduce the adhesive glue of the second glue coating part from overflowing inward toward the pressure relief part, reduce the risk of glue overflow strengthening the notch, and ensure the reliability of the pressure relief part.

[0040] In some embodiments, in the second direction, opposite ends of the second adhesive coating portion are connected to adjacent first adhesive coating portions.

[0041] In the above technical solution, by setting the first glue coating part and the second glue coating part to be connected, each glue coating part can form a closed loop structure in the circumferential direction of the pressure relief part. In other words, there is no force transmission gap between the first glue coating part and the second glue coating part. In this way, after the battery cell is installed in the box, the set wall is bonded and fixed to the inner circumferential wall of the box at each position in the circumferential direction of the pressure relief part by adhesive, and the pressure relief part is surrounded by adhesive, which can effectively reduce the external force of the adhesive from passing through the adhesive and entering the pressure relief part. That is, the internal expansion force generated by the electrode assembly can be well transmitted to the box, thereby reducing the structural deformation of the set wall in the area where the pressure relief part is located, making the protection effect more comprehensive, reducing the force transmission through the gaps between the glue coating parts, and improving the safety of the pressure relief part.

[0042] In some embodiments, the housing has a plurality of wall portions, one of the plurality of wall portions is a setting wall, and the electrode terminal is provided on at least one wall portion except the setting wall.

[0043] In the above technical solution, the electrode terminals and the pressure relief portion can be disposed on different walls of the housing. This prevents the structure on the designated wall where the pressure relief portion is located from interfering with the electrode terminals. For example, when the first or second adhesive coating portion is disposed on the designated wall, there is no need to consider whether the first and second adhesive coating portions should avoid the electrode terminals. This makes the arrangement of the first and second adhesive coating portions more convenient and more efficient. Furthermore, if adhesive overflows from the first and second adhesive coating portions, the adhesive will not flow toward the electrode terminals, thereby ensuring the safety of the electrode terminals.

[0044] In a second aspect, an embodiment of the present application further provides a battery, comprising: a box body having a target box wall; a battery cell according to any of the above embodiments, the battery cell being arranged in the box body, the set wall being arranged facing the target box wall, and the first glue coating portion being connected to the target box wall.

[0045] In the above technical solution, this setting can enable the set wall of the battery cell to be fixedly bonded to the target box wall on the outside of the pressure relief part, so that when the electrode assembly of the battery cell expands internally, the expansion force can be transmitted to the outside of the first glue coating part, and transmitted to the box body using the bonding contact surface, thereby realizing the diffusion of the expansion force, thereby reducing the expansion force directly acting on the pressure relief part, reducing the occurrence of notches and cracks in the pressure relief part, improving the safety of the pressure relief part, reducing the leakage of the pressure relief part, and improving the safety of the battery.

[0046] In some embodiments, the target box wall has a thickness greater than the set wall thickness.

[0047] In the above technical solution, the target box wall can be made less likely to deform than the set wall. Therefore, after the set wall and the target box wall are bonded and fixed by the glue coating part, the expansion force on the set wall can act on the target box wall through the glue coating part. After the target box wall is subjected to the expansion force, it can effectively absorb the expansion force without causing a large deformation, thereby improving the structural strength of the set wall and reducing the deformation of the set wall in the area where the pressure relief part is located.

[0048] In some embodiments, the product of the target box wall thickness and the target box wall material tensile strength is M1, and the product of the set wall thickness and the set wall material tensile strength is M2, wherein M2 is greater than M1.

[0049] In the above technical solution, after the set wall and the target box wall are bonded and fixed by the first glue coating part and the second glue coating part, the expansion force on the set wall can be transmitted to the target box wall through the first glue coating part and the second glue coating part. The target box wall has a strong anti-deformation ability, so that the target box wall can absorb the collision force through the glue coating part and improve the overall anti-deformation ability of the set wall, thereby reducing the serious deformation of the set wall in the area where the pressure relief part is located, improving the safety of the pressure relief part, and improving the reliability of the battery.

[0050] In a third aspect, the embodiments of the present application further provide an electrical device comprising a battery cell according to any embodiment, or a battery according to any embodiment.

[0051] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0053] FIG1 is a schematic diagram of an electrical device according to some embodiments of the present application;

[0054] FIG2 is a schematic diagram of a battery according to some embodiments of the present application;

[0055] FIG3 is a schematic diagram of a battery cell at a set wall according to some embodiments of the present application;

[0056] FIG4 is a schematic diagram of a battery cell at a set wall according to some other embodiments of the present application;

[0057] FIG5 is a top schematic diagram of a battery cell according to some embodiments of the present application;

[0058] FIG6 is an exploded view of a battery cell according to some embodiments of the present application;

[0059] FIG7 is a bottom schematic diagram of a battery cell according to some embodiments of the present application;

[0060] FIG8 is a bottom schematic diagram of a battery cell according to some embodiments of the present application (with the pressure relief portion exploded);

[0061] FIG9 is a top schematic diagram of a battery cell according to other embodiments of the present application;

[0062] FIG10 is an exploded view of a battery cell according to some other embodiments of the present application;

[0063] FIG11 is a schematic diagram of a housing according to some other embodiments of the present application.

[0064] Reference numerals:

[0065] Vehicle 1000,

[0066] Battery 100, box 11, first box body 111, second box body 112, target box wall 113,

[0067] Battery cell 21, housing 211, setting wall 212, pressure relief portion 213, first adhesive portion 214, non-adhesive portion 215, first gap 216, second adhesive portion 217, second gap 218, electrode assembly 22, electrode terminal 23, first direction X, second direction Y,

[0068] Controller 200, motor 300. DETAILED DESCRIPTION

[0069] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0070] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0071] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0072] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0073] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0074] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0075] The term "plurality" used in this application refers to two or more (including two).

[0076] In this application, the battery cell 21 may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and the embodiments of this application do not limit this. The battery cell 21 may be cylindrical, flat, rectangular, or in other shapes, and the embodiments of this application do not limit this. The battery cell 21 is generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0077] The battery 100 referred to in the embodiments of this application refers to a single physical module comprising one or more battery cells 21 to provide higher voltage and capacity. For example, the battery 100 referred to in this application may include a battery module or a battery pack. The battery 100 generally includes a housing 11 for enclosing one or more battery cells 21 or multiple battery modules. The housing 11 prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells 21.

[0078] The battery cell 21 includes a housing 211, an electrode assembly 22, and an electrolyte. The housing 211 houses the electrode assembly 22 and the electrolyte. The electrode assembly 22 consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell 21 primarily operates by the movement of metal ions between the positive and negative electrode sheets.

[0079] The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the current collector. The uncoated positive current collector protrudes from the coated current collector, serving as the positive electrode tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the current collector. The uncoated negative current collector protrudes from the coated current collector, serving as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To ensure high current flow without melting, multiple positive tabs are stacked, and multiple negative tabs are stacked.

[0080] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly 22 may be a wound structure or a laminated structure, but the present invention is not limited thereto.

[0081] New energy vehicles have experienced rapid development in recent years. In the electric vehicle sector, power batteries, as the power source, play an irreplaceable and important role. Battery 100 consists of a housing 11 and multiple battery cells 21 housed within it. As a core component of new energy vehicles, battery 100 is subject to stringent requirements in terms of both safety and cycle life.

[0082] Generally speaking, during the charge and discharge cycles of the electrode assembly 22, the electrode assembly 22 may experience rigid expansion. Deformation of the plane where the pressure relief portion 213 is located can easily pull on the notches on the pressure relief portion 213, causing leakage from the pressure relief portion 213 and compromising safety. Although some technical solutions have adopted thickening the housing 11 of the battery cell 21 to address the issue of leakage from the pressure relief portion 213 due to deformation of the housing 11, thickening the housing 11 significantly affects the spatial energy density of the electrode assembly 22.

[0083] Based on the above considerations, in order to solve the problem of cracking caused by pulling on the notch of the pressure relief part 213, the inventor of the present application designed a battery cell 21, and the battery cell 21 is provided with glue on the side where the pressure relief part 213 is located to bond it to the box body 11 of the battery 100. The glue can bond the side where the pressure relief part 213 in the battery cell 21 is located to the inner wall of the box body 11, so that the side is relatively fixed to the box body 11, thereby reducing the expansion of the electrode assembly 22 of the battery cell 21. The side where the pressure relief part 213 is located is pulled too much, so that the pressure relief part 213 is less affected by the expansion of the electrode assembly 22, thereby greatly reducing the situation where the pressure relief part 213 ruptures and causes leakage, thereby improving the safety of the battery cell 21, and not adopting the method of thickening the box body 11, which is conducive to ensuring the energy density of the electrode assembly 22 space, thereby improving the overall safety of the battery 100.

[0084] The battery 100 disclosed in the embodiment of the present application can be used, but is not limited to, in electrical devices such as vehicles 1000, ships, or aircraft. The use of the battery 100 with the battery cells 21 disclosed in the present application can improve the safety of the battery 100, thereby ensuring the safety of electrical devices such as vehicles 1000.

[0085] The present invention provides an electric device using a battery 100 as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0086] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0087] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0088] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0089] Please refer to Figure 2, which is an exploded view of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 11 and a plurality of battery cells 21, which are intended to be housed within the housing 11. The housing 11 is used to provide assembly space for the battery cells 21 and can adopt a variety of structures. In some embodiments, the housing 11 can include a first housing body 111 and a second housing body 112. The first housing body 111 and the second housing body 112 overlap each other, and the first housing body 111 and the second housing body 112 jointly define an assembly space for accommodating the battery cells 21. The second housing body 112 can be a hollow structure with one end open. The first housing body 111 can be a plate-like structure, and the first housing body 111 overlaps the open side of the second housing body 112, so that the first housing body 111 and the second housing body 112 jointly define an assembly space. The first housing body 111 and the second housing body 112 can also be hollow structures with one end open, with the open side of the first housing body 111 overlapping the open side of the second housing body 112. Of course, the box body 11 formed by the first box body 111 and the second box body 112 can be in various shapes, such as a cylinder, a cuboid, etc.

[0090] In the battery 100, multiple battery cells 21 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 21. Multiple battery cells 21 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery 100 structure can be housed within the housing 11. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 21 in series, in parallel, or in a hybrid connection to form a module. Multiple battery modules 100 can then be connected in series, in parallel, or in a hybrid connection to form a single unit housed within the housing 11. The battery 100 can also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 21.

[0091] The battery cell 21 according to an embodiment of the present application is described below with reference to FIG. 3 to FIG. 11 , and includes a housing 211 , an electrode assembly 22 , and an electrode terminal 23 .

[0092] The electrode assembly 22 is arranged in the outer shell 211, and the electrode assembly 22 is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 21 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The electrode terminal 23 is arranged on the outer shell 211 and is electrically connected to the electrode assembly 22, wherein the electrode terminal 23 can be a pole, and the pole includes a positive pole and a negative pole. As shown in Figures 3 and 4, a positive pole and a negative pole are provided on the top of the battery cell 21, and the positive pole and the negative pole are separated by a cover plate placed on the battery cell 21. Among them, as shown in Figure 4, the positive pole sheet is formed with a positive pole tab, and the positive pole tab is electrically connected to the positive pole, and the negative pole sheet is formed with a negative pole tab, and the negative pole tab is electrically connected to the negative pole.

[0093] The housing 211 has a setting wall 212, and a pressure relief portion 213 and a first glue coating portion 214 are provided on the setting wall 212, and the first glue coating portion 214 is provided on opposite sides of the pressure relief portion 213. In other words, in actual design, the first glue coating portion 214 can be provided in two groups, and the two groups of first glue coating portions 214 and pressure relief portions 213 are both provided on the setting wall 212, and the two groups of first glue coating portions 214 are respectively located on both sides of the pressure relief portion 213. It should be noted that the setting wall 212 can be the bottom wall of the housing 211 or the side wall of the housing 211. As shown in Figures 5 and 6, the setting wall 212 is the bottom wall of the housing 211 and the pressure relief portion 213 is provided on the bottom wall of the housing 211, or as shown in Figures 7 to 9, the setting wall 212 is the side wall of the housing 211 and the pressure relief portion 213 is provided on the side wall of the housing 211. The pressure relief portion 213 may include but is not limited to an explosion-proof disk, an explosion-proof valve, a safety valve, etc. The pressure relief portion 213 may be provided with a notch, and the notch is a structural weakness of the pressure relief portion 213 .

[0094] Thus, when the battery cell 21 is installed in the housing 11 of the battery 100, the outer side surfaces of the battery cell 21 are arranged relative to the inner side surfaces of the housing 11. After installation and fixation, the first adhesive portion 214 can be bonded and fixed to the inner side surfaces of the housing 11, so that the position of the battery cell 21 in the housing 11 is relatively stable. For example, as shown in Figures 4 and 5, the bottom wall of the battery cell 21 is configured as a set wall 212, and the pressure relief portion 213 is provided on the bottom wall of the battery cell 21. At the same time, the first adhesive portion 214 is provided on both sides of the battery cell 21 in the width direction of the pressure relief portion 213. Therefore, after the battery cell 21 is installed in the housing 11, the bottom wall of the housing 211 is bonded to the inner wall of the housing 11 through the two first adhesive portions 214, so that the bottom wall of the housing 211 is relatively fixed to the inner bottom wall of the housing 11. In this way, when the electrode assembly 22 is charged and discharged for a long time and internal expansion occurs, the bottom wall of the outer shell 211 is bonded to the box body 11 through the first glue coating part 214, which can reduce the deformation of the bottom wall of the outer shell 211, that is, the wall where the pressure relief part 213 is located as the electrode assembly 22 expands, thereby reducing the occurrence of ruptures at the notches of the pressure relief part 213, reducing the risk of leakage from the pressure relief part 213, and improving the stability and reliability of the pressure relief part 213.

[0095] In some embodiments, the setting wall 212 has a first direction X, and the first glue coating portion 214 extends along the first direction X. In the first direction X, the size of the pressure relief portion 213 is L1, and the size of the first glue coating portion 214 is L2. The first direction X can be the length direction of the setting wall 212, as shown in Figures 3 and 4, where the left and right directions in the figures are the first direction X.

[0096] Among them, 1.0≤L2 / L1≤2.0, thus, the ratio of the extension dimension of the first glue coating portion 214 along the first direction X to the extension dimension of the pressure relief portion 213 along the first direction X can be set between 1.0 and 2.0. Exemplarily, L2 / L1 can include but is not limited to 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, etc.

[0097] Therefore, the length of the first glue coating portion 214 along the first direction X is set to be greater than the length of the pressure relief portion 213 along the first direction X, so that the first glue coating portion 214 can cover various areas on both sides of the pressure relief portion 213 in the first direction X, thereby helping to enhance the bonding effect of the first glue coating portion 214 on both sides of the pressure relief portion 213. It can be understood that during actual installation, the setting wall 212 is bonded and fixed to the inner wall of the box body 11 of the battery 100 by the first glue coating portion 214 on both sides of the pressure relief portion 213 along the first direction X, and the length of the bonding area along the first direction X is greater than the extension length of the pressure relief portion 213, so that the bonding area can fully cover the pressure relief portion 213 from both sides. In this way, the force transmitted to the setting wall 212 when the electrode assembly 22 expands can be maximized through the first glue coating portion 214 on both sides, reducing the force transmitted to the pressure relief portion 213 through the uncovered area, thereby enhancing the protection effect of the pressure relief portion 213 and improving the safety of the battery cell 21.

[0098] In some embodiments, L2 / L1≤1.5, that is, in actual design, the ratio of the extension dimension of the first glue coating portion 214 along the first direction X to the extension dimension of the pressure relief portion 213 along the first direction X can be set to between 1.0 and 1.5. For example, L2 / L1 can be 1.3, or 1.2, 1.4, etc.

[0099] Therefore, the extension length of the first glue coating portion 214 along the first direction X is not only greater than the pressure relief portion 213 but also closer to the pressure relief portion 213, so that the first glue coating portion 214 can not only use the bonding effect to structurally strengthen the two side areas of the pressure relief portion 213, but also ensure that the length of the first glue coating portion 214 will not be too large to cause waste of the glue coating area. At the same time, it can also reduce the occupation of the bonding space while ensuring the bonding strength.

[0100] In addition, it can be understood that after bonding through the first glue coating part 214, not only the safety of the pressure relief part 213 can be guaranteed, but also the excessive adhesion caused by the first glue coating part 214 can be reduced, that is, the risk of the first glue coating part 214 bonding to the setting wall 212 as a whole is reduced, so that the setting wall 212 can absorb the expansion force generated by the electrode assembly 22 to a certain extent while ensuring the safety of the pressure relief part 213, thereby reducing the risk of excessive squeezing inside the electrode assembly 22 and improving the rationality of the overall setting.

[0101] According to some embodiments of the present application, the setting wall 212 has a first direction X and a second direction Y, the first glue coating portion 214 extends along the first direction X, and the second direction Y is perpendicular to the first direction X. That is, the first direction X and the second direction Y may be two directions perpendicular to each other on the setting wall 212, such as the first direction X is along the length direction of the setting wall 212, and the second direction Y is along the width direction of the setting wall 212, or the first direction X is along the width direction of the setting wall 212, and the second direction Y is along the length direction of the setting wall 212. For example, as shown in Figures 3 and 4, the first direction X is along the length direction of the setting wall 212, that is, the left-right direction in the figure, and the second direction Y is the width direction, that is, the up-down direction in the figure.

[0102] Among them, in the second direction Y, the size of the pressure relief portion 213 is W1, and the size of the first glue coating portion 214 is W2, wherein 0.3≤W2 / W1≤1.0, that is, in the second direction Y, the size of the pressure relief portion 213 is larger than the size of the first glue coating portion 214. As shown in Figures 3 and 4, the second direction Y is the width direction of the set wall 212 in the figure, and the ratio of the width dimension of the first glue coating portion 214 to the width dimension of the pressure relief portion 213 is between 0.3 and 1.0. For example, the ratio W2 / W1 may include but is not limited to 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, etc.

[0103] Furthermore, in some embodiments, 0.4≤W2 / W1≤0.7. For example, W2 / W1 can be, but is not limited to, 0.4, 0.45, 0.52, 0.55, 0.58, 0.60, 0.62, 0.63, 0.65, 0.68, 0.7, etc.

[0104] Therefore, by setting the dimensions of the first adhesive coating portion 214 and the pressure relief portion 213 in the second direction Y within the above-mentioned range, the width of the first adhesive coating portion 214 will not be too small, thereby ensuring sufficient bonding area between the setting wall 212 and the inner wall of the box body 11, improving the bonding stability between the two, and effectively reducing the deformation of the setting wall 212 in the area where the pressure relief portion 213 is located. At the same time, the coating area of ​​the first adhesive coating portion 214 will not be too large, reducing adhesive waste, and a deformation area is reserved in the outer area of ​​the first adhesive coating portion 214 to achieve expansion and collapse while ensuring the safety of the pressure relief portion 213, thereby improving the internal safety of the battery cell 21.

[0105] According to some embodiments of the present application, a non-glue coated portion 215 is provided on the setting wall 212. The non-glue coated portion 215 is provided on a side of the first glue coated portion 214 away from the pressure relief portion 213, that is, on both sides of the pressure relief portion 213, and includes both the first glue coated portion 214 and the non-glue coated portion 215. As shown in Figures 3 and 4, there are two first glue coated portions 214, which are located on the upper and lower sides of the pressure relief portion 213, respectively. A non-glue coated portion 215 is formed above the upper first glue coated portion 214, and a non-glue coated portion 215 is also formed below the lower first glue coated portion 214. In other words, non-glue coated portions 215 are formed in the outermost areas of the upper and lower sides of the setting wall 212.

[0106] Therefore, by setting the non-glue-coated part 215, a blank glue overflow area can be formed on the outside of the first glue-coated part 214. In other words, when the first glue-coated part 214 is glued and the battery cell 21 is installed in the box body 11, the installation extrusion force can cause the adhesive at the first glue-coated part 214 to overflow toward the non-glue-coated part 215, that is, during the installation process, the adhesive at the first glue-coated part 214 will not overflow from the set wall 212, thereby reducing the overflow of the adhesive to other areas.

[0107] In addition, the non-glue-coated portion 215 can be an area where the set wall 212 is not bonded to the inner wall of the box body 11. This area is separated from the pressure relief portion 213, and the force applied to it will not directly act on the pressure relief portion 213. It can absorb part of the expansion force from the inside of the electrode assembly 22, thereby reducing the risk of damage to the pressure relief portion 213 and reducing the internal pressure of the electrode assembly 22. The non-glue-coated portion 215 can release the deformation stress of the outer shell 211 and improve the safety of the battery cell 21.

[0108] In some embodiments, the setting wall 212 has a first direction X and a second direction Y, the first glue coating portion 214 extends along the first direction X, and the second direction Y is perpendicular to the first direction X. That is, the first direction X and the second direction Y can be two directions perpendicular to each other on the setting wall 212, such as the first direction X is along the length direction of the setting wall 212, and the second direction Y is along the width direction of the setting wall 212, or the first direction X is along the width direction of the setting wall 212, and the second direction Y is along the length direction of the setting wall 212. For example, as shown in Figures 3 and 4, the first direction X is along the length direction of the setting wall 212, that is, the left-right direction in the figure, and the second direction Y is the width direction, that is, the up-down direction in the figure.

[0109] In the second direction Y, the size of the non-glue-coated portion 215 is W3, and the size of the set wall 212 is W0, wherein 0.05≤W3 / W0≤0.2. That is, in the second direction Y, the ratio of the size of the non-glue-coated portion 215 to the size of the set wall 212 is within the range of 0.1 to 0.2. As shown in FIG3 and FIG4 , the second direction Y is the width direction of the set wall 212 in the figures, and the ratio of the width dimension of the non-glue-coated portion 215 to the size of the set wall 212 is within the range of 0.05 to 0.2. For example, the ratio W3 / W0 may include, but is not limited to, 0.05, 0.07, 0.1, 0.12, 0.14, 0.15, 0.16, 0.18, 0.20, etc.

[0110] Furthermore, in some embodiments, 0.08≤W3 / W0≤0.15. For example, W3 / W0 may include, but is not limited to, 0.08, 0.09, 0.11, 0.12, 0.15, and the like.

[0111] Therefore, by setting the dimensions of the non-glue-coated portion 215 and the set wall 212 in the second direction Y within the above range, the width of the non-glue-coated portion 215 will not be too small, thereby ensuring sufficient space for glue overflow outside the first glue-coated portion 214 and achieving effective glue overflow at the first glue-coated portion 214. Of course, the width of the non-glue-coated portion 215 can also be made not too large, reducing the space occupied by the non-glue-coated portion 215, balancing the width of the first glue-coated portion 214, and ensuring reliable bonding.

[0112] In some embodiments, a first gap 216 is formed between the first glue coating portion 214 and the pressure relief portion 213. In other words, the first glue coating portion 214 and the pressure relief portion 213 can be spaced apart and distributed, and a first gap 216 is reserved between the two. In this way, the adhesive at the first glue coating portion 214 can be reduced from directly bonding or flowing to the pressure relief portion 213. Similarly, the first gap 216 can also serve as a glue overflow area for the first glue coating portion 214.

[0113] The setting wall 212 has a first direction X and a second direction Y. The first glue coating portion 214 extends along the first direction X, and the second direction Y is perpendicular to the first direction X. That is, the first direction X and the second direction Y can be two directions perpendicular to each other on the setting wall 212, such as the first direction X is along the length direction of the setting wall 212, and the second direction Y is along the width direction of the setting wall 212, or the first direction X is along the width direction of the setting wall 212, and the second direction Y is along the length direction of the setting wall 212. For example, as shown in Figures 3 and 4, the first direction X is along the length direction of the setting wall 212, that is, the left-right direction in the figures, and the second direction Y is the width direction, that is, the up-down direction in the figures.

[0114] In the second direction Y, the dimension of the first gap 216 is h1, where 3 mm ≤ h1 ≤ 15 mm. That is, in the second direction Y, the dimension of the first gap 216 can be set within the range of 3 mm to 15 mm. As shown in FIG3 and FIG4 , the second direction Y is the width direction of the set wall 212 in the figure, and the width dimension of the first gap 216 can be set to 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc.

[0115] Therefore, by providing the first gap 216, sufficient glue overflow space is ensured on the inner side of the first glue coating portion 214, thereby achieving effective glue overflow at the first glue coating portion 214. In this way, the glue overflow space is formed on both the inner and outer sides of the first glue coating portion 214, which not only reduces the adhesive from the first glue coating portion 214 from overflowing outside the set wall 212, but also reduces the adhesive from the first glue coating portion 214 from overflowing inward toward the pressure relief portion 213, thereby reducing the risk of adhesive overflow reinforcing the notch, and ensuring the reliability of the pressure relief portion 213.

[0116] According to some embodiments of the present application, the setting wall 212 has a first direction X and a second direction Y, the first glue coating portion 214 extends along the first direction X, and the second direction Y is perpendicular to the first direction X. That is, the first direction X and the second direction Y may be two directions perpendicular to each other on the setting wall 212, such as the first direction X is along the length direction of the setting wall 212, and the second direction Y is along the width direction of the setting wall 212, or the first direction X is along the width direction of the setting wall 212, and the second direction Y is along the length direction of the setting wall 212. For example, as shown in Figures 3 and 4, the first direction X is along the length direction of the setting wall 212, that is, the left-right direction in the figure, and the second direction Y is the width direction, that is, the up-down direction in the figure.

[0117] Among them, in the second direction Y, one of the two opposite edges of the first glue-coated portion 214 is in contact with the edge of the setting wall 212, and the other is in contact with the edge of the pressure relief portion 213. In other words, the second direction Y is the width direction of the setting wall 212. As shown in the up-down direction in FIG3 , the first glue-coated portion 214 is located in the area of ​​the setting wall 212 excluding the pressure relief portion 213. In other words, the width of the first glue-coated portion 214 along the second direction Y is the same as the distance between the edge of the setting wall 212 and the edge of the pressure relief portion 213, so that both sides of the pressure relief portion 213 of the setting wall 212 along the second direction Y are glue-coated areas of the first glue-coated portion 214. As a result, the area of ​​the bonding area of ​​the setting wall 212 outside the pressure relief portion 213 can be increased, thereby improving the bonding stability of the setting wall 212 and the box body 11, thereby reducing the impact of the internal expansion of the electrode assembly 22 on the pressure relief portion 213.

[0118] In some embodiments, the setting wall 212 has a first direction X and a second direction Y, the first glue-coated portion 214 extends along the first direction X, the second direction Y is perpendicular to the first direction X, and a non-glue-coated portion 215 is provided on the setting wall 212. The non-glue-coated portion 215 is provided on the side of the first glue-coated portion 214 away from the pressure relief portion 213. In the second direction Y, the size of the first glue-coated portion 214 is W2, and the size of the non-glue-coated portion 215 is W3, wherein 0.4≤W3 / W2≤1.0, that is, in the second direction Y, the first glue-coated portion 214 is W3, and the non-glue-coated portion 215 is W3. The ratio of the size of 14 to the size of the non-glue-coated portion 215 is between 0.4 and 1.0. For example, the ratio W3 / W2 between the two can be 0.4, 0.41, 0.45, 0.46, 0.52, 0.53, 0.56, 0.61, 0.73, 0.85, 0.91, 1.0, etc. Therefore, a first glue-coated portion 214 with a sufficient size ratio can be set on both sides of the pressure relief portion 213 to ensure the glue-coated area of ​​the set wall 212 in the second direction Y, thereby ensuring the bonding area between the set wall 212 and the box body 11.

[0119] Thus, by setting the dimensions of the first adhesive portion 214 and the set wall 212 within the aforementioned ratio range, the first adhesive portion 214 can be made sufficiently large, ensuring that the bonding force between the first adhesive portion 214 and the housing 11 can ensure stability within the region where the pressure relief portion 213 is located. At the same time, the width of the first adhesive portion 214 is not excessively large, leaving sufficient installation space for the pressure relief portion 213 in the second direction Y, thereby achieving reasonable installation of the pressure relief portion 213.

[0120] Furthermore, in some embodiments, 0.6 ≤ W3 / W2 ≤ 0.8. The ratio W3 / W2 can be 0.6, 0.62, 0.65, 0.74, 0.78, 0.8, etc. This further increases the size of the first adhesive portion 214 to ensure that the bonding force between the first adhesive portion 214 and the housing 11 can maintain stability within the region where the pressure relief portion 213 is located. Furthermore, the width of the first adhesive portion 214 is not excessively large, leaving sufficient installation space for the pressure relief portion 213 in the second direction Y, thereby ensuring proper installation of the pressure relief portion 213.

[0121] In some embodiments, the setting wall 212 has a second glue coating portion 217, and the second glue coating portion 217 is located on the other two opposite sides of the pressure relief portion 213. In other words, the first glue coating portion 214 and the second glue coating portion 217 can be respectively arranged on both sides of two different directions of the pressure relief portion 213, so that the two first glue coating portions 214 and the two second glue coating portions 217 can be distributed around the pressure relief portion 213, thereby making the setting wall 212 have a good bonding effect around the pressure relief portion 213, thereby ensuring bonding stability.

[0122] In some embodiments, the setting wall 212 has a first direction X and a second direction Y, the first glue coating portion 214 extends along the first direction X, and the second direction Y is perpendicular to the first direction X. That is, the first direction X and the second direction Y can be two directions perpendicular to each other on the setting wall 212, such as the first direction X is along the length direction of the setting wall 212, and the second direction Y is along the width direction of the setting wall 212, or the first direction X is along the width direction of the setting wall 212, and the second direction Y is along the length direction of the setting wall 212. For example, as shown in Figures 3 and 4, the first direction X is along the length direction of the setting wall 212, that is, the left-right direction in the figure, and the second direction Y is the width direction, that is, the up-down direction in the figure.

[0123] The second adhesive coating portion 217 extends along the second direction Y. That is, the second adhesive coating portion 217 is also constructed in an elongated strip shape, and the first adhesive coating portion 214 is perpendicular to the extension direction of the second adhesive coating portion 217. There are two first adhesive coating portions 214, which are arranged on both sides of the pressure relief portion 213 along the first direction X and are distributed in an elongated strip shape. There are two second adhesive coating portions 217, which are arranged on both sides of the pressure relief portion 213 along the second direction Y and are distributed in an elongated strip shape. In other words, the pressure relief portion 213 is not only provided with two sets of first adhesive coating portions 214 on both sides in the first direction X, but also provided with second adhesive coating portions 217 on both sides in the second direction Y. This allows both the first adhesive coating portions 214 and the second adhesive coating portions 217 to play a role in strengthening the bonding. The elongated adhesive coating portion has a larger surface area, thereby facilitating an increase in the bonding area between the setting wall 212 and the inner wall of the box body 11, thereby ensuring the reliability of the connection between the setting wall 212 and the box body 11 in the area where the pressure relief portion 213 is located.

[0124] Exemplarily, as shown in Figure 3, the setting wall 212 is set to have a first glue coating portion 214 on both sides of the pressure relief portion 213 in the first direction X, that is, on the upper side and the lower side. At the same time, the setting wall 212 is set to have a second glue coating portion 217 on both sides of the pressure relief portion 213 in the second direction Y, that is, on the left side and the right side, so that the first glue coating portion 214 and the second glue coating portion 217 are distributed in a ring shape on the outside of the pressure relief portion 213, so that a glue coating structure is formed on the circumference of the pressure relief portion 213.

[0125] Therefore, by setting the first glue coating portion 214 and the second glue coating portion 217, the first glue coating portion 214 and the second glue coating portion 217 are coordinated and distributed around the pressure relief portion 213. In this way, when the battery cell 21 is installed in the box body 11 of the battery 100, the pressure relief portion 213 is bonded and fixed to the inner wall of the box body 11 at multiple positions on the circumference to form an annular bonding area, so that when an expansion force is generated inside the electrode assembly 22, the expansion force can be transmitted to the box body 11 through the adhesive from any position on the circumference of the pressure relief portion 213, and will not directly act on the area where the pressure relief portion 213 is located, thereby reducing the structural deformation of the pressure relief portion 213 caused by the expansion force, reducing the risk of notching and cracking, and improving the safety and reliability of the installation of the pressure relief portion 213.

[0126] In some embodiments, in the first direction X, the second adhesive coating portion 217 has a dimension L3, and the pressure relief portion 213 has a dimension L1, where 0.15 ≤ L3 / L1 ≤ 1.5. The first direction X may be the length direction of the setting wall 212, as shown in Figures 1 and 2, where the left-right direction is the first direction X. Thus, the ratio of the extension dimension of the second glue coating portion 217 along the first direction X to the extension dimension of the pressure relief portion 213 along the first direction X can be set to between 0.15 and 1.5. For example, L3 / L1 can be 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, etc.

[0127] Thus, the length of the second adhesive portion 217 along the first direction X can be set to be the same as the length of the pressure relief portion 213 along the first direction X, or the length of the second adhesive portion 217 along the first direction X can be set to be smaller than the length of the pressure relief portion 213 along the first direction X, thereby enhancing the bonding effect of the second adhesive portion 217 on both sides of the pressure relief portion 213. It is understood that during actual installation, the wall 212 is bonded and fixed to the inner wall of the battery case 11 by the second adhesive portion 217 on both sides of the pressure relief portion 213 along the second direction Y, and the above-mentioned ratio is set to be greater than or equal to 0.15. This ensures that the bonding area between the second adhesive portion 217 and the case 11 can generate effective bonding force on both sides of the pressure relief portion 213 in the second direction Y, thereby improving the connection stability between the two. Moreover, the ratio between the two is set to be less than or equal to 1.5, which can reduce the waste of adhesive caused by the excessive area of ​​the second adhesive portion 217 and achieve a reasonable setting of the structural dimensions.

[0128] In some embodiments, a second gap 218 is formed between the second glue coating portion 217 and the pressure relief portion 213. In other words, the second glue coating portion 217 and the pressure relief portion 213 can be spaced apart and distributed, and a second gap 218 is reserved between the two. In this way, the adhesive at the second glue coating portion 217 can be reduced from directly bonding or flowing to the pressure relief portion 213. Similarly, the second gap 218 can also serve as a glue overflow area for the second glue coating portion 217.

[0129] In the first direction X, the dimension of the second gap 218 is h2, where 3 mm ≤ h2 ≤ 15 mm. That is, in the first direction X, the dimension of the second gap 218 can be set within the range of 3 mm to 15 mm. As shown in FIG3 and FIG4 , the first direction X is the length direction of the set wall 212 in the figures, and the width dimension of the second gap 218 can be set to 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc.

[0130] Therefore, by setting the second gap 218, it is ensured that there is sufficient space for glue overflow on the inner side of the second glue coating part 217, and effective glue overflow is achieved at the second glue coating part 217, which can reduce the adhesive glue of the second glue coating part 217 from overflowing inward toward the pressure relief part 213, reduce the risk of glue overflow forming adhesion reinforcement on the notch, and ensure the reliability of the pressure relief part 213.

[0131] In some embodiments, in the second direction Y, the opposite ends of the second glue coating portion 217 are connected to the adjacent first glue coating portion 214, that is, the end of the first glue coating portion 214 is connected to the end of the second glue coating portion 217. As shown in Figure 3, there are two first glue coating portions 214, and the two first glue coating portions 214 are spaced apart in parallel. At the same time, there are two second glue coating portions 217, and the two second glue coating portions 217 are spaced apart in parallel. The two ends of each first glue coating portion 214 are respectively connected to the ends of the two second glue coating portions 217, so that the first glue coating portion 214 and the second glue coating portion 217 are connected to form an annular structure distributed around the pressure relief portion 213.

[0132] Thus, by connecting the first adhesive portion 214 and the second adhesive portion 217, each adhesive portion can form a closed loop structure in the circumferential direction of the pressure relief portion 213. In other words, there is no force transmission gap between the first adhesive portion 214 and the second adhesive portion 217. In this way, after the battery cell 21 is installed in the housing 11, the set wall 212 is bonded and fixed to the inner circumferential wall of the housing 11 at each position in the circumferential direction of the pressure relief portion 213 by adhesive, and the pressure relief portion 213 is surrounded by adhesive, thereby effectively reducing the external force of the adhesive from passing through the adhesive and entering the pressure relief portion 213. That is, the internal expansion force generated by the electrode assembly 22 can be effectively transmitted to the housing 11, thereby reducing the structural deformation of the set wall 212 in the area where the pressure relief portion 213 is located, making the protection effect more comprehensive, reducing the force transmission through the gaps between the adhesive portions, and improving the safety of the pressure relief portion 213.

[0133] In some embodiments of the present application, the shell 211 has multiple wall portions, one of the multiple wall portions is a setting wall 212, and the electrode terminal 23 is arranged on at least one wall portion other than the setting wall 212. In this way, the electrode terminal 23 and the pressure relief portion 213 can be respectively arranged on different wall portions of the shell 211, thereby realizing a dispersed arrangement of the structure.

[0134] Exemplarily, as shown in Figures 5 to 7, the outer shell 211 is constructed as a rectangular parallelepiped shell, that is, the outer shell 211 has six walls, wherein the bottom wall of the outer shell 211 is constructed as a setting wall 212, and there are two electrode terminals 23, both of which are arranged on the top wall of the outer shell 211. Also, as shown in Figures 7 to 9, one side wall of the outer shell 211 is constructed as a setting wall 212, and an electrode terminal 23 is provided on the top and bottom walls of the outer shell 211, and one of them is a positive electrode column and the other is a negative electrode column, that is, it can be understood as the two end output columns of the battery cell 21, and a pressure relief portion 213 is provided on the side. Alternatively, one side wall of the outer shell 211 is constructed as a setting wall 212, and two electrode terminals 23 are provided on the other side wall.

[0135] As a result, the electrode terminal 23 and the pressure relief portion 213 can be respectively arranged on different wall surfaces of the housing 211. In this way, the structure on the setting wall 212 where the pressure relief portion 213 is located will not cause structural interference with the electrode terminal 23. For example, when the first adhesive coating portion 214 or the second adhesive coating portion 217 is arranged on the setting wall 212, there is no need to consider the issue of the first adhesive coating portion 214 and the second adhesive coating portion 217 avoiding the electrode terminal 23. This makes the arrangement of the first adhesive coating portion 214 and the second adhesive coating portion 217 more convenient and more efficient. At the same time, when the first adhesive coating portion 214 and the second adhesive coating portion 217 overflow, the adhesive will not flow to the electrode terminal 23, thereby ensuring the safety of the electrode terminal 23.

[0136] According to an embodiment of the present application, a pole is provided on the top wall of the battery cell 21, an explosion-proof valve is provided on the bottom wall, and a glue coating portion is provided on the bottom wall. The glue coating portion is provided on both sides of the explosion-proof valve along the length direction of the bottom wall.

[0137] According to another embodiment of the present application, poles are provided on the top and bottom walls of the battery cell 21, an explosion-proof valve is provided on the side wall, and a glue coating portion is provided on the side wall, which is provided on both sides of the explosion-proof valve along the length direction of the side wall.

[0138] According to some embodiments of the present application, the present application also provides a battery 100, including a box body 11 and a battery cell 21 of any one of the above-mentioned embodiments, the battery cell 21 is arranged in the box body 11, the box body 11 has a target box wall 113, the setting wall 212 is arranged opposite to the target box wall 113, and the first glue coating portion 214 is connected to the target box wall 113, that is, the setting wall 212 is bonded to the inner side surface of the target box wall 113 through the first glue coating portion 214, so that the battery cell 21 and the box body 11 are relatively fixed.

[0139] For example, if the bottom wall of the outer shell 211 of the battery cell 21 is constructed as a set wall 212, and the bottom wall of the box body 11 is a target box wall 113, when the battery cell 21 is installed in the box body 11, the set wall 212 is opposite to one of the bottom walls of the box body 11 so that the two are bonded and fixed, and the gravity of the battery cell 21 can be used to make the first glue coating part 214 more stably bonded to the target box wall 113.

[0140] Therefore, through this setting, the set wall 212 of the battery cell 21 can be fixedly bonded to the target box wall 113 on the outside of the pressure relief part 213, so that when the electrode assembly 22 of the battery cell 21 expands internally, the expansion force can be transmitted to the outside of the first glue coating part 214, and transmitted to the box body 11 using the bonding contact surface, thereby realizing the diffusion of the expansion force, thereby reducing the expansion force directly acting on the pressure relief part 213, reducing the occurrence of notches and cracks in the pressure relief part 213, improving the safety of the pressure relief part 213, and reducing the leakage of the pressure relief part 213.

[0141] In addition, during actual installation, the pressure relief portion 213 is provided with a first glue coating portion 214 and a second glue coating portion 217 on both sides in the first direction X and on both sides in the second direction Y, respectively, so that the first glue coating portion 214 and the second glue coating portion 217 can be bonded to the target box wall 113, so that the circumferential force acting on the pressure relief portion 213 can be transmitted to the target box wall 113 through the glue coating portion in the corresponding area, reducing the deformation at the pressure relief portion 213 and improving the safety and reliability of the pressure relief portion 213.

[0142] In some embodiments, the wall thickness of the target box wall 113 is greater than the wall thickness of the set wall 212. For example, the bottom wall of the outer shell 211 of the battery cell 21 is constructed as the set wall 212, and the bottom wall of the box body 11 is the target box wall 113. The thickness of the bottom wall of the box body 11 is greater than the thickness of the bottom wall of the outer shell 211.

[0143] As a result, the bottom wall of the box body 11 is less likely to deform than the bottom wall of the outer shell 211. Therefore, after the setting wall 212 and the target box wall 113 are bonded and fixed by the glue portion, the expansion force on the setting wall 212 can act on the target box wall 113 through the glue portion, and after the target box wall 113 is subjected to the expansion force, it can effectively absorb the expansion force without causing a large deformation, thereby improving the structural strength of the setting wall 212 and reducing the large deformation of the setting wall 212 in the area where the pressure relief portion 213 is located.

[0144] In some embodiments, the product of the target wall thickness 113 and the tensile strength of the material of the target wall 113 is M1, and the product of the target wall thickness 212 and the tensile strength of the material of the target wall 212 is M2, where M2 is greater than M1. The product of the target wall thickness 113 and the tensile strength of the material of the target wall 113 can determine the structural strength of the target wall 113. Meanwhile, the product of the target wall thickness 212 and the tensile strength of the material of the target wall 212 can determine the structural strength of the target wall 212. A larger parameter corresponds to a greater structural strength and a stronger anti-deformation capability.

[0145] In other words, by setting M2 to be greater than M1, when the target box wall 113 and the set wall 212 are subjected to the same force, the target box wall 113 is less likely to undergo structural deformation, which helps to ensure the stability of the target box wall 113.

[0146] Therefore, after the set wall 212 and the target box wall 113 are bonded and fixed by the first glue coating portion 214 and the second glue coating portion 217, the expansion force on the set wall 212 can be transmitted to the target box wall 113 through the first glue coating portion 214 and the second glue coating portion 217. The target box wall 113 has a strong anti-deformation ability, so that the target box wall 113 can absorb the collision force through the glue coating portion and improve the overall anti-deformation ability of the set wall 212, thereby reducing the serious deformation of the set wall 212 in the area where the pressure relief portion 213 is located, improving the safety of the pressure relief portion 213, and improving the reliability of the battery 100.

[0147] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery cell 21 of any of the above schemes or the battery 100 of any of the above schemes, and the battery 100 is used to provide electrical energy to the electrical device.

[0148] The electrical device may be a device or system using the battery 100 of any of the aforementioned embodiments.

[0149] For example, the electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0150] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0151] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0152] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0153] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0154] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell, wherein: include: A shell, wherein the shell has a setting wall, the setting wall is provided with a pressure relief portion and a first glue coating portion, and the first glue coating portion is provided on two opposite sides of the pressure relief portion; an electrode assembly, the electrode assembly being disposed in the housing; An electrode terminal is disposed on the housing and electrically connected to the electrode assembly.

2. The battery cell according to claim 1, wherein: The set wall has a first direction, the first rubber coating portion extends along the first direction, and in the first direction, the size of the pressure relief portion is L1, and the size of the first rubber coating portion is L2, wherein 1.0≤L2 / L1≤2.

0.

3. The battery cell according to claim 2, wherein: L2 / L1≤1.

5.

4. The battery cell according to any one of claims 1 to 3, wherein: The set wall has a first direction and a second direction, the first rubber coating portion extends along the first direction, the second direction is perpendicular to the first direction, and in the second direction, the size of the pressure relief portion is W1, and the size of the first rubber coating portion is W2, wherein 0.3≤W2 / W1≤1.

0.

5. The battery cell according to claim 4, wherein: 0.4≤W2 / W1≤0.

7.

6. The battery cell according to any one of claims 1 to 5, wherein: The setting wall is provided with a non-glue coated portion, and the non-glue coated portion is arranged on a side of the first glue coated portion away from the pressure relief portion.

7. The battery cell according to claim 6, wherein: The set wall has a first direction and a second direction, the first glue-coated portion extends along the first direction, the second direction is perpendicular to the first direction, and in the second direction, the size of the non-glue-coated portion is W3, and the size of the set wall is W0, wherein 0.05≤W3 / W0≤0.

2.

8. The battery cell according to claim 7, wherein: 0.08≤W3 / W0≤0.

15.

9. The battery cell according to any one of claims 1 to 8, wherein: A first gap is formed between the first glue coating portion and the pressure relief portion, the set wall has a first direction and a second direction, the first glue coating portion extends along the first direction, the second direction is perpendicular to the first direction, and in the second direction, a size of the first gap is h1, wherein 3mm≤h1≤15mm.

10. The battery cell according to any one of claims 1 to 5, wherein: The set wall has a first direction and a second direction, the first rubber coating portion extends along the first direction, the second direction is perpendicular to the first direction, and in the second direction, one of the two opposite edges of the first rubber coating portion is connected to the edge of the set wall, and the other is connected to the edge of the pressure relief portion.

11. The battery cell according to any one of claims 1 to 9, wherein: The set wall has a first direction and a second direction, the first rubber-coated portion extends along the first direction, the second direction is perpendicular to the first direction, a non-rubber-coated portion is provided on the set wall, and the non-rubber-coated portion is provided on a side of the first rubber-coated portion away from the pressure relief portion, and in the second direction, a size of the first rubber-coated portion is W2, and a size of the non-rubber-coated portion is W3, wherein 0.4≤W3 / W2≤1.

0.

12. The battery cell according to claim 11, wherein: 0.6≤W3 / W2≤0.

8.

13. The battery cell according to any one of claims 1 to 12, wherein: The setting wall has a second glue coating portion, and the second glue coating portion is located on the other two opposite sides of the pressure relief portion.

14. The battery cell according to claim 13, wherein: The setting wall has a first direction and a second direction, the first glue coating portion extends along the first direction, the second direction is perpendicular to the first direction, and the second glue coating portion extends along the second direction.

15. The battery cell according to claim 14, wherein: In the first direction, the size of the second glue coating portion is L3, and the size of the pressure relief portion is L1, wherein 0.15≤L3 / L1≤1.

5.

16. The battery cell according to claim 14 or 15, wherein: A second gap is formed between the second glue coating portion and the pressure relief portion. In the first direction, a size of the second gap is h2, wherein 3 mm ≤ h2 ≤ 15 mm.

17. The battery cell according to any one of claims 14 to 16, wherein: In the second direction, opposite ends of the second glue-coated portion are connected to adjacent first glue-coated portions.

18. The battery cell according to any one of claims 1 to 17, wherein: The housing has a plurality of wall portions, one of the plurality of wall portions is the setting wall, and the electrode terminal is provided on at least one of the wall portions except the setting wall.

19. A battery, wherein: include: A box having a target box wall ； The battery cell according to any one of claims 1 to 18, wherein the battery cell is arranged in the box body, the set wall is arranged opposite to the target box wall, and the first glue coating portion is connected to the target box wall.

20. The battery according to claim 19, wherein The wall thickness of the target box wall is greater than the wall thickness of the set wall.

21. The battery according to claim 20, wherein The product of the wall thickness of the target box wall and the tensile strength of the material of the target box wall is M1, and the product of the wall thickness of the set wall and the tensile strength of the material of the set wall is M2, wherein M2 is greater than M1.

22. An electrical device, wherein: The method comprises the battery cell according to any one of claims 1 to 18, or the battery according to any one of claims 19 to 21.

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