Battery, electric device, and energy storage device

Abstract

Provided are a battery (10), an electric device, and an energy storage device. The use performance of the battery can be improved. The battery (10) comprises: a battery cell (20), wherein a pressure relief mechanism (213) is provided on a first wall (215) of the battery cell (20); and a support component (12), used for supporting the battery cell (20), wherein the support component (12) is attached to the first wall (215) by means of an adhesive (112). First grooves (121) each having an opening facing the battery cell (20) are formed in the surface of the support component (12) close to the battery cell (20), and the first grooves (121) are used for accommodating part of the adhesive (112).

Description

Batteries, electrical equipment and energy storage equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202420332539.6, filed on February 22, 2024, entitled “Batteries, Electrical Equipment and Energy Storage Equipment,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The embodiments of the present application relate to the field of battery technology, and in particular to a battery, an electrical device, and an energy storage device. Background Art

[0004] With increasing environmental pollution, the new energy industry is attracting increasing attention. Battery technology is a crucial factor in the development of this industry. In addition to improving battery electrical performance, safety is also a crucial issue. If battery safety cannot be guaranteed, the battery will be unusable, reducing its performance.

[0005] Therefore, how to improve the performance of batteries has become a technical problem that needs to be solved urgently in this field.

[0006] Summary of the Invention

[0007] In view of this, embodiments of the present application provide a battery, an electrical device, and an energy storage device, which can improve the performance of the battery.

[0008] In a first aspect, a battery is provided, comprising: a battery cell, a first wall of which is provided with a pressure relief mechanism; a support component for supporting the battery cell, the support component being attached to the first wall by an adhesive; wherein a surface of the support component close to the battery cell is provided with a first groove opening toward the battery cell, the first groove being used to accommodate a portion of the adhesive.

[0009] In an embodiment of the present application, a first groove with an opening toward the battery cell is provided on the surface of the battery support component close to the battery cell. The first groove is used to accommodate a portion of the adhesive between the first wall and the support component. When the battery is subjected to vibration or impact, the risk of the adhesive overflowing to the area where the pressure relief mechanism of the battery cell is located can be reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism, thereby improving the performance of the battery. At the same time, the structure is simple to implement, can effectively reduce the process complexity of battery processing and manufacturing, and reduce processing costs and battery weight.

[0010] In some implementations, the first groove extends along a length direction of the battery cell, or the first groove extends along a width direction of the battery cell.

[0011] In the embodiment of the present application, the first groove is extended along the length direction of the battery cell, or the first groove is extended along the width direction of the battery cell, so as to facilitate the processing and manufacturing of the battery and reduce the processing cost of the battery 10.

[0012] In some implementations, the dimension L1 of the first groove along the direction in which the first groove extends is greater than or equal to the width W2 of the battery cell. Thus, in the embodiments of the present application, by setting the dimension L1 of the first groove along the direction in which the first groove extends to be greater than or equal to the width W2 of the battery cell, the adhesive between the support component and the first wall can overflow into the first groove when the battery is subjected to vibration or impact, effectively reducing the risk of the adhesive overflowing into the area where the pressure relief mechanism of the battery cell is located, and reducing the impact on the actuation performance of the pressure relief mechanism, thereby improving the performance of the battery.

[0013] In some implementations, a distance D1 between the first bottom wall of the first groove and the surface of the support component close to the battery cell accounts for 20% to 90% of a thickness D2 of the support component.

[0014] In an embodiment of the present application, by setting the distance D1 between the first bottom wall of the first groove and the surface of the support component close to the battery cell to 20%-90% of the thickness D2 of the support component, the risk of the support component breaking when the battery is subjected to vibration or impact and other working conditions can be effectively reduced. At the same time, the risk of the adhesive overflowing to the area where the pressure relief mechanism of the battery cell is located can be effectively reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism, thereby improving the performance of the battery.

[0015] In some implementations, the ratio of the dimension W1 of the first groove along a direction perpendicular to the extension of the first groove to the viscosity P of the adhesive is greater than or equal to 0.001. Thus, in the embodiment of the present application, by setting the ratio of the dimension W1 of the first groove along a direction perpendicular to the extension of the first groove to the viscosity P of the adhesive to be greater than or equal to 0.001, the risk of the adhesive overflowing into the first groove due to the high viscosity P of the adhesive when the battery is subjected to vibration or impact can be reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism, thereby improving the performance of the battery.

[0016] In some implementations, the ratio of the dimension W1 of the first groove along a direction perpendicular to the extension of the first groove to the viscosity P of the adhesive is greater than or equal to 0.005. Thus, in the embodiment of the present application, by setting the ratio of the dimension W1 of the first groove along a direction perpendicular to the extension of the first groove to the viscosity P of the adhesive to be greater than or equal to 0.005, the risk of the adhesive overflowing into the first groove due to the high viscosity P of the adhesive when the battery is subjected to vibration or impact can be effectively reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism, thereby improving the performance of the battery.

[0017] In some implementations, the support component is provided with a first through-hole corresponding to the pressure relief mechanism. Thus, in the embodiments of the present application, by providing the first through-hole corresponding to the pressure relief mechanism on the support component, when the pressure relief mechanism of the battery cell is actuated, the exhaust discharged from the pressure relief mechanism can be smoothly discharged through the first through-hole, thereby reducing the thermal impact on the battery cell and improving the battery's performance. In some implementations, the distance L3 between the first side wall of the first groove near the first through-hole and the inner wall of the first through-hole near the first groove accounts for 15%-91% of the length L2 of the battery cell.

[0018] In an embodiment of the present application, by making the distance L3 between the first side wall of the first groove close to the first through hole and the inner wall of the first through hole close to the first groove account for 15%-91% of the length L2 of the battery cell, when the battery is subjected to vibration or impact and other working conditions, the risk of the adhesive overflowing to the area where the pressure relief mechanism of the battery cell is located can be reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism, thereby improving the performance of the battery.

[0019] In some implementations, on a plane perpendicular to an extension direction of the first groove, the shape of the first groove is one of the following shapes: rectangle, square, inverted triangle, trapezoid, or semicircle.

[0020] In an embodiment of the present application, on a plane perpendicular to the extension direction of the first groove, the shape of the first groove is one of the following shapes: rectangle, square, inverted triangle, trapezoid or semicircle, so as to facilitate the processing and manufacturing of the battery and reduce the processing cost of the battery.

[0021] In some implementations, the battery further includes an isolation component connected between the support component and the first wall, wherein the isolation component is configured to prevent the adhesive from being applied to the area where the pressure relief mechanism is located.

[0022] In an embodiment of the present application, an isolation component is provided in the battery, and the isolation component is connected between the support component and the first wall. The isolation component is configured to prevent the adhesive from being applied to the area where the pressure relief mechanism is located. When the battery is subjected to vibration or impact, the risk of the adhesive overflowing to the area where the pressure relief mechanism of the battery cell is located can be effectively reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism, thereby improving the battery's performance.

[0023] In some implementations, the support component includes a plurality of the first grooves, and on a plane perpendicular to a thickness direction of the support component, a projection of the isolation component covers at least one of the plurality of the first grooves.

[0024] In an embodiment of the present application, the support component includes a plurality of the first grooves. On a plane perpendicular to the thickness direction of the support component, by covering at least one of the plurality of the first grooves with the projection of the isolation component, when the battery is subjected to vibration or impact and other working conditions, the risk of the adhesive overflowing into the area where the pressure relief mechanism of the battery cell is located can be effectively reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism, thereby improving the performance of the battery.

[0025] In some implementations, multiple first grooves are disposed around the pressure relief mechanism. Thus, in the embodiments of the present application, by disposing multiple first grooves around the pressure relief mechanism, the risk of the adhesive overflowing into the area of ​​the pressure relief mechanism of the battery cell when the battery is subjected to vibration or impact can be further reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism and improving the performance of the battery.

[0026] In some embodiments, the isolation component is provided with a second groove opening toward the battery cell, at least a portion of the second side wall of the second groove is located within the first through hole, and an outer edge of the second groove is connected to the second side wall and is provided between the support component and the first wall.

[0027] In an embodiment of the present application, the isolation component is set as a second groove with an opening toward the battery cell, at least a portion of the second side wall of the second groove is located in the first through hole, and the outer edge of the second groove is connected to the second side wall and is arranged between the support component and the first wall. When the support component is configured to be attached to the first wall by an adhesive, the adhesive can be effectively prevented from being applied between the support component and the pressure relief mechanism, thereby reducing the impact of the adhesive entering the area where the pressure relief mechanism is located on the actuation performance of the pressure relief mechanism, thereby improving the performance of the battery.

[0028] In some implementations, the second bottom wall of the second groove is provided with a second through hole corresponding to the pressure relief mechanism. Thus, in the embodiment of the present application, by providing the second through hole corresponding to the pressure relief mechanism on the second bottom wall of the second groove, the discharge from the battery cell can be quickly passed through the isolation component, thereby allowing the discharge to be discharged in a timely manner, reducing the impact of the accumulation of the discharge in the second groove on the actuation performance of the pressure relief mechanism, thereby reducing the thermal impact on the battery cell and improving the performance of the battery.

[0029] In some implementations, the second bottom wall of the second groove is configured to be broken by the exhaust from the battery cell when the pressure relief mechanism is actuated, so that the exhaust passes through the isolation component.

[0030] In an embodiment of the present application, by configuring the second bottom wall of the second groove to be capable of being destroyed by the emissions discharged from the battery cell when the pressure relief mechanism is actuated, and allowing the emissions to pass through the isolation component, the emissions can be discharged in a timely manner, thereby reducing the impact of the accumulation of the emissions in the second groove on the actuation performance of the pressure relief mechanism, thereby reducing the thermal impact on the battery cell and improving the performance of the battery.

[0031] In some implementations, the second bottom wall of the second groove is provided with a weakened area, and the weakened area is configured to be broken by the exhaust when the pressure relief mechanism is actuated, so that the exhaust passes through the isolation component.

[0032] In an embodiment of the present application, a weak area is provided on the second bottom wall of the second groove, and the weak area is configured to be destroyed by the discharge when the pressure relief mechanism is actuated, that is, when the internal pressure or temperature of the battery cell reaches a threshold value, the discharge can pass through the isolation component in a timely and rapid manner to achieve rapid pressure relief of the battery cell, effectively reducing the impact of the accumulation of the discharge in the second groove on the actuation performance of the pressure relief mechanism, thereby improving the performance of the battery.

[0033] In some embodiments, the weak zone satisfies at least one of the following: the melting point of the material of the weak zone is lower than the melting point of the material of the rest of the isolation component; the thickness of the weak zone is lower than the thickness of the rest of the isolation component; and a notch is provided on the surface of the weak zone in a direction perpendicular to the thickness of the isolation component.

[0034] In an embodiment of the present application, the weak area is set to at least one of the following: the melting point of the material of the weak area is lower than the melting point of the material of the rest of the isolation component; the thickness of the weak area is less than the thickness of the rest of the isolation component; the surface of the weak area perpendicular to the thickness direction of the isolation component is provided with notches, so that the weak area is more easily destroyed by the emissions of the battery cell than the rest of the isolation component, and when the internal pressure or temperature of the battery cell reaches a threshold value, the emissions can pass through the weak area in a timely and rapid manner to achieve rapid pressure relief of the battery cell, reducing the impact of the accumulation of the emissions on the actuation performance of the pressure relief mechanism of the isolation component close to the battery cell, thereby improving the performance of the battery.

[0035] In a second aspect, an electric device is provided, comprising the battery described in any one of the implementations of the first aspect, wherein the battery is used to provide electric energy to the electric device.

[0036] In some implementations, the electrical device may be a vehicle, a ship, or a spacecraft.

[0037] In a third aspect, an energy storage device is provided, comprising the battery described in any one of the implementations of the first aspect, wherein the battery is used to store electrical energy for the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0039] FIG1 is a schematic structural diagram of a vehicle provided in one embodiment of the present application.

[0040] FIG2 is a schematic structural diagram of a battery provided in one embodiment of the present application.

[0041] FIG3 is a schematic structural diagram of a battery cell provided in one embodiment of the present application.

[0042] FIG4 is a schematic structural diagram of a battery provided in another embodiment of the present application.

[0043] FIG5 is a schematic cross-sectional view of a battery provided in accordance with an embodiment of the present application.

[0044] FIG6 is a schematic cross-sectional view of a battery provided in another embodiment of the present application.

[0045] FIG7 is a partial cross-sectional schematic diagram of a battery provided in another embodiment of the present application.

[0046] FIG8 is a partial cross-sectional schematic diagram of a battery provided in another embodiment of the present application.

[0047] FIG9 is a partial cross-sectional schematic diagram of a battery provided in another embodiment of the present application.

[0048] FIG10 is a partial cross-sectional schematic diagram of a battery provided in another embodiment of the present application.

[0049] FIG11 is a partial cross-sectional schematic diagram of a battery provided in another embodiment of the present application.

[0050] FIG12 is a schematic cross-sectional view of a battery provided in another embodiment of the present application.

[0051] FIG13 is a schematic cross-sectional view of a battery provided in another embodiment of the present application.

[0052] FIG14 is a schematic cross-sectional view of a battery provided in another embodiment of the present application.

[0053] FIG15 is a cross-sectional schematic diagram of a battery provided in another embodiment of the present application.

[0054] Explanation of the reference numerals: 1-vehicle; 10-battery; 20-battery cell; 30-controller; 40-motor; 11-casing; 21-housing; 22-electrode assembly; 211-shell; 212-cover; 213-pressure relief mechanism; 221a-first pole ear; 222a-second pole ear; 214-electrode terminal; 214a-positive electrode terminal; 214b-negative electrode terminal; 12-support component; 13-isolating component; 112-adhesive; 121-first groove; 122-first through hole; 1221-inner wall of the first through hole 122; 1211-first bottom wall of the first groove 121; 1212-first side wall of the first groove 121; 130-second groove; 131-second side wall of the second groove 130; 132-outer edge of the second groove 130; 133-second bottom wall of the second groove 130; 134-weak area.

[0055] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0056] The following detailed description of the implementation of the present application is provided in conjunction with the accompanying drawings and embodiments. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application. That is, the present application is not limited to the described embodiments.

[0057] In the description of the embodiments of the present application, it should be noted that, unless otherwise specified, the meaning of "multiple" is more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but is within the allowable error range. "Parallel" is not parallel in the strict sense, but is within the allowable error range.

[0058] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present application. In the description of the embodiments of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0059] The term "and / or" in the embodiments of the present application is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in the embodiments of the present application generally indicates that the associated objects are in an "or" relationship.

[0060] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meaning as commonly understood by those skilled in the art in the technical field of the present application; the terms used in the specification of the application in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the embodiments of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the embodiments of the present application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0061] 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. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0062] The battery in the embodiments of this application refers to a physical module that includes one or more battery cells to provide electrical energy. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a housing that encloses one or more battery cells. The housing can reduce the effects of liquids or other foreign matter on the charging or discharging of the battery cells.

[0063] It should be understood that the battery cells in the embodiments of the present application include but are not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0064] In some implementations, a battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator is placed between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0065] In some implementations, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0066] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0067] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0068] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. In some implementations, other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4, also referred to as LFP), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0069] As an example, the positive active material may include at least one of a sodium transition metal oxide, a polyanion compound, and a Prussian blue-based compound.

[0070] In some implementations, the sodium transition metal oxide may be a sodium transition metal oxide that has been doped and modified, and the doping modification of the sodium transition metal oxide may include at least one of sodium site doping modification, oxygen site doping modification, transition metal site doping modification, and surface coating modification.

[0071] In some implementations, a metal foam may be used as the positive electrode. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When the metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0072] In some implementations, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0073] As an example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, etc. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0074] In some implementations, the battery cell in the embodiments of the present application may be a negative electrode-free sodium secondary battery.

[0075] A negative electrode-free sodium secondary battery refers to a battery cell that does not actively set a negative electrode active material layer on the negative electrode side during the manufacturing process of the battery cell. For example, during the manufacturing process of the battery cell, a sodium metal or carbonaceous active material layer is not set at the negative electrode through processes such as coating or deposition to form a negative electrode active material layer. During the first charge, sodium ions gain electrons on the anode side and deposit on the surface of the current collector to form a sodium metal phase. During discharge, metallic sodium can be converted into sodium ions and return to the positive electrode, realizing cyclic charge and discharge. Compared with other sodium secondary batteries, negative electrode-free sodium secondary battery cells can achieve higher energy density due to the lack of a negative electrode active material layer.

[0076] In some implementations, in order to improve the performance of battery cells, some functional coatings, such as carbonaceous materials, metal oxides, alloys, etc., can be provided on the negative electrode side of the negative electrode-free sodium secondary battery to improve the conductivity of the negative electrode current collector and improve the uniformity of the deposited sodium metal.

[0077] In some implementations, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0078] In some implementations, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0079] In some implementations, the separator is a separator. The present invention has no particular restrictions on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be used.

[0080] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0081] In some implementations, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to both transport ions and isolate the positive and negative electrodes.

[0082] In some implementations, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0083] In some implementations, the electrode assembly may be a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0084] In some implementations, the electrode assembly is a laminated structure. As an example, multiple positive and negative electrodes may be provided, and the multiple positive and negative electrodes may be alternately stacked.

[0085] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0086] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments that are stacked.

[0087] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0088] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0089] In some implementations, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0090] In some implementations, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0091] In some implementations, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0092] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include square-shell, blade-shaped, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0093] In order to meet different power requirements, the battery in the embodiment of the present application may include multiple battery cells, wherein the multiple battery cells can be connected in series, in parallel, or in hybrid connection, and hybrid connection refers to a mixture of series and parallel connection. In some implementations, multiple battery cells can first be connected in series, in parallel, or in hybrid connection to form a battery module, and multiple battery modules can then be connected in series, in parallel, or in hybrid connection to form a battery. In other words, multiple battery cells can directly form a battery, or they can first form a battery module, and the battery module can then form a battery. The battery is further provided in an electrical device to provide electrical energy to the electrical device.

[0094] In some implementations, the battery in the embodiments of the present application may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0095] In some implementations, the battery in the embodiments of the present application may be a battery pack, which includes a housing and battery cells, wherein the battery cells or battery modules are housed in the housing.

[0096] In some implementations, the box in the embodiments of the present application can be used as part of the chassis structure of a vehicle. For example, a portion of the box can become at least a portion of the vehicle's floor, or a portion of the box can become at least a portion of the vehicle's crossbeams and longitudinal beams.

[0097] With the increasing severity of environmental pollution, the new energy industry has attracted more and more attention. In the new energy industry, battery technology is an important factor related to its development. In the development of battery technology, in addition to improving the electrical performance of the battery, safety issues are also an issue that cannot be ignored. If the safety of the battery is not guaranteed, the battery cannot be used, which reduces the performance of the battery. At present, during the assembly process of the battery, the battery cell and the supporting component are connected by an adhesive. Considering the overall weight of the battery and the manufacturing process, an isolation component is usually provided between the pressure relief mechanism of the battery cell and the supporting component. However, when the pressure on the battery cell is too large, the adhesive between the battery cell and the supporting component will overflow to the area where the pressure relief mechanism is located, which is easy to block the pressure relief mechanism and affect the performance of the pressure relief mechanism, thereby reducing the performance of the battery. Therefore, how to improve the performance of the battery has become a technical problem that needs to be solved urgently in this field.

[0098] In view of this, an embodiment of the present application provides a battery comprising: a battery cell, a first wall of which is provided with a pressure relief mechanism; a support component for supporting the battery cell, the support component being attached to the first wall via an adhesive; wherein a surface of the support component proximate the battery cell is provided with a first groove opening toward the battery cell, the first groove being configured to partially accommodate the adhesive. Thus, in this embodiment of the present application, when the battery is subjected to operating conditions such as vibration or impact, the risk of the adhesive overflowing into the area of ​​the battery cell where the pressure relief mechanism is located can be reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism and thereby improving the battery's performance.

[0099] The technical solutions described in the embodiments of the present application are applicable to various battery-powered electrical devices. For example, the electrical devices may be vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0100] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the electrical equipment described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the following embodiments are described in detail using the electrical equipment as a vehicle as an example.

[0101] For example, as shown in FIG1 , it is a structural schematic diagram of a vehicle 1 provided in an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery 10 may be provided inside the vehicle 1. The controller 30 is used to control the battery 10 to power the motor 40. For example, a battery 10 may be provided at the bottom, front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, and for example, the battery 10 may be used for the starting, navigation and operation of the vehicle 1 to meet the working power requirements. In some implementations of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0102] In order to meet different power usage requirements, the battery 10 in the embodiment of the present application may include at least one battery cell group, and the battery cell group includes a plurality of battery cells, wherein the plurality of battery cells can be electrically connected in series, in parallel, or in hybrid to form a battery 10, wherein hybrid refers to a mixture of series and parallel. The battery 10 may also be referred to as a battery pack. For example, a plurality of battery cells can first be connected in series, in parallel, or in hybrid to form a battery module, and a plurality of battery modules can then be connected in series, in parallel, or in hybrid to form a battery 10. In other words, a plurality of battery cells can directly form a battery 10, or they can first be formed into a battery module, and then the battery modules can be formed into a battery 10.

[0103] In some implementations, the battery 10 may include multiple battery cells 20. For example, FIG2 is a schematic structural diagram of a battery 10 according to one embodiment of the present application. The battery 10 may include multiple battery cells 20. The battery 10 may also include a housing 11 having a hollow interior and housing the multiple battery cells 20. For example, the multiple battery cells 20 may be connected in parallel, in series, or in a mixed combination and then placed in the housing 11.

[0104] In some implementations, the battery 10 may further include other structures, which will not be described in detail here. For example, the battery 10 may further include a busbar component, which is used to achieve electrical connection between multiple battery cells 20, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Furthermore, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the box through a conductive mechanism. Optionally, the conductive mechanism may also belong to the busbar component.

[0105] In the embodiment of the present application, the number of battery cells 20 can be set to any value according to different power requirements. Multiple battery cells 20 can be connected in series, parallel or hybrid to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, for ease of installation, the battery cells 20 can be grouped, and each group of battery cells 20 constitutes a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to demand. The battery 10 may include multiple battery modules, which can be connected in series, parallel or hybrid.

[0106] As shown in FIG3 , it is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application. The battery cell 20 includes one or more electrode assemblies 22, a shell 211 and a cover plate 212. The shell 211 and the cover plate 212 form an outer shell 21 or a battery box. The walls of the shell 211 and the cover plate 212 are both referred to as the walls of the battery cell 20. For a rectangular battery cell 20, the walls of the shell 211 include a bottom wall and four side walls. The shell 211 is determined according to the shape of the one or more electrode assemblies 22 after combination. For example, the shell 211 can be a hollow cuboid, a cube or a cylinder, and one of the faces of the shell 211 has an opening so that one or more electrode assemblies 22 can be placed in the shell 211. For example, when the shell 211 is a hollow cuboid or a cube, one of the planes of the shell 211 is an open surface, that is, the plane does not have a wall, so that the inside and outside of the shell 211 are connected. When the housing 211 is a hollow cylinder, the end surface of the housing 211 is an open surface, that is, the end surface has no wall, so that the inside and outside of the housing 211 are connected. The cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity for accommodating the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0107] The battery cell 20 may also include two electrode terminals 214, which may be disposed on the cover plate 212. The cover plate 212 is typically flat, with the two electrode terminals 214 secured to the flat surface of the cover plate 212. The two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a corresponding connecting member, also known as a current collecting member, located between the cover plate 212 and the electrode assembly 22 to electrically connect the electrode assembly 22 to the electrode terminals 214.

[0108] As shown in FIG3 , each electrode assembly 22 has a first electrode tab 221 a and a second electrode tab 222 a. The polarities of the first electrode tab 221 a and the second electrode tab 222 a are opposite. For example, when the first electrode tab 221 a is a positive electrode tab, the second electrode tab 222 a is a negative electrode tab.

[0109] In the battery cell 20 , the electrode assembly 22 can be provided as a single one or multiple ones according to actual use requirements. As shown in FIG3 , two independent electrode assemblies 22 are provided in the battery cell 20 .

[0110] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is used to be activated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold value.

[0111] The pressure relief mechanism 213 may have various possible pressure relief structures. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism configured to melt when the internal temperature of the battery cell 20 equipped with the pressure relief mechanism 213 reaches a threshold; and / or the pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism configured to rupture when the internal pressure of the battery cell 20 equipped with the pressure relief mechanism 213 reaches a threshold.

[0112] Figure 4 is a schematic structural diagram of a battery 10 provided in another embodiment of the present application. Figure 5 is a schematic cross-sectional diagram of a battery 10 provided in another embodiment of the present application. Figure 6 is a schematic cross-sectional diagram of a battery 10 provided in another embodiment of the present application. Figures 7 to 11 are partial schematic cross-sectional diagrams of the battery 10 provided in an embodiment of the present application, respectively. For example, Figure 5 may be a schematic cross-sectional diagram of a corresponding portion of the battery 10 in Figure 4, or Figure 6 may be a schematic cross-sectional diagram of a corresponding portion of the battery 10 in Figure 4. Figures 7 to 11 may be enlarged schematic cross-sectional diagrams of the corresponding portions of the battery 10 in Figure 4.

[0113] In some embodiments, as shown in Figures 4 to 11, the battery 10 includes a battery cell 20 and a support component 12, the first wall 215 of the battery cell 20 is provided with a pressure relief mechanism 213, the support component 12 is used to support the battery cell 20, and the support component 12 is attached to the first wall 215 by an adhesive 112, wherein the surface of the support component 12 close to the battery cell 20 is provided with a first groove 121 opening toward the battery cell 20, and the first groove 121 is used to accommodate part of the adhesive 112.

[0114] It should be understood that in the embodiments of the present application, for the convenience of description, as shown in Figures 4 to 11, the direction Z may be the thickness direction or height direction of the battery 10, or the direction Z may also be the thickness direction of the support component 12, and the direction Z is perpendicular to the direction X and the direction Y; the direction X may be the length direction of the battery 10, and the direction X is perpendicular to the direction Z and the direction Y; the direction Y may be the width direction of the battery 10, and the direction Y is perpendicular to the direction Z and the direction X.

[0115] It should be understood that the first wall 215 in the embodiment of the present application may be any wall of the battery cell 20. For example, the first wall 215 includes but is not limited to the following examples: the first wall 215 may be the wall with the smallest area of ​​the battery cell 20; the first wall 215 may also be the wall with the largest area of ​​the battery cell 20; the first wall 215 may be the wall of the battery cell 20 on which the electrode terminal 214 is provided; the first wall 215 may be the wall adjacent to the wall of the battery cell 20 on which the electrode terminal 214 is provided; the first wall may be the wall opposite to the wall of the battery cell 20 on which the electrode terminal 214 is provided.

[0116] It should also be understood that in the embodiment of the present application, when the battery cell 20 is a square structure, the length direction of the battery cell 20 is perpendicular to the height direction and width direction of the battery cell 20, and the length L2 of the battery cell 20 may be the dimension of the longer side of the cross-section of the battery cell 20 perpendicular to the height direction of the battery cell 20, and the length L2 of the battery cell 20 may be greater than or equal to the width W2 of the battery cell 20.

[0117] It should also be understood that in the embodiment of the present application, the adhesive 112 used to bond the support component 12 to the first wall 215 includes but is not limited to polyurethane adhesive, acrylic adhesive, and silicone rubber adhesive.

[0118] It should also be understood that in the embodiment of the present application, the at least one first groove 121 is used to accommodate part of the adhesive 112, which means that when the battery 10 is subjected to working conditions such as vibration or impact, for example, when the battery 10 is subjected to pressure in the thickness direction of the isolation component 13, the adhesive 112 between the isolation component 13 and the first wall 215 will move toward the area where the pressure relief mechanism 213 is located under pressure, and the first groove 121 can be used to accommodate part of the adhesive 112 that moves toward the area where the pressure relief mechanism 213 is located.

[0119] It should also be understood that in the embodiment of the present application, the shape of the bottom wall 1211 of the first groove 121 can be set according to actual needs. For example, the shape of the bottom wall 1211 of the first groove 121 can be set according to the shape of the first through hole 122 or the shape of the pressure relief mechanism 213 of the battery cell 20. Exemplarily, the shape of the bottom wall 1211 of the first groove 121 includes but is not limited to a circle, an ellipse, a rectangle, and a regular polygon.

[0120] In an embodiment of the present application, a first groove 121 with an opening toward the battery cell 20 is provided on the surface of the support component 12 of the battery 10 near the battery cell 20. The first groove 121 is used to accommodate a portion of the adhesive 112 between the first wall 215 and the support component 12. When the battery 10 is subjected to vibration or impact, the risk of the adhesive 112 overflowing to the area where the pressure relief mechanism 213 of the battery cell 20 is located can be reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism 213, thereby improving the performance of the battery 10. At the same time, the structure is simple to implement, which can effectively reduce the process complexity of the battery 10 manufacturing process, and reduce the processing cost and the weight of the battery 10.

[0121] In some implementations, the first groove 121 extends along the length of the battery cell 20, or the first groove 121 extends along the width of the battery cell 20. Thus, in the embodiment of the present application, by extending the first groove 121 along the length of the battery cell 20, or extending the first groove 121 along the width of the battery cell 20, the processing and manufacturing of the battery 10 can be facilitated, and the processing cost of the battery 10 can be reduced.

[0122] Figure 12 shows a schematic cross-sectional view of a battery 10 according to another embodiment of the present application, Figure 13 shows a schematic cross-sectional view of a battery 10 according to another embodiment of the present application, and Figure 14 shows a schematic cross-sectional view of a battery 10 according to another embodiment of the present application. For example, Figures 12 and 13 may be schematic cross-sectional views of corresponding portions of the battery 10 in Figure 4 taken perpendicular to the direction Z.

[0123] In some implementations, as shown in FIG. 12 to FIG. 14 , a dimension L1 of the first groove 121 along an extension direction of the first groove 121 is greater than or equal to a width W2 of the battery cell 20 .

[0124] It should be understood that in the embodiment of the present application, the dimension L1 of the first groove 121 along the extension direction of the first groove 121 can be the maximum value, minimum value or average value of the dimension of the first groove 121 along the extension direction of the first groove 121.

[0125] In an embodiment of the present application, by setting the dimension L1 of the first groove 121 along the extension direction of the first groove 121 to be greater than or equal to the width W2 of the battery cell 20, the adhesive 112 located between the support component 12 and the first wall 215 can overflow into the first groove 121 when the battery 10 is subjected to working conditions such as vibration or impact, effectively reducing the risk of the adhesive 112 overflowing into the area where the pressure relief mechanism 213 of the battery cell 20 is located, and reducing the impact on the actuation performance of the pressure relief mechanism 213, thereby improving the performance of the battery 10.

[0126] In some implementations, as shown in Figures 7 to 11, the distance D1 between the first bottom wall 1211 of the first groove 121 and the surface of the support member 12 near the battery cell 20 accounts for 20%-90% of the thickness D2 of the support member 12. For example, in the embodiments of the present application, the ratio of the distance D1 between the first bottom wall 1211 of the first groove 121 and the surface of the support member 12 near the battery cell 20 to the thickness D2 of the support member 12 can be set to: 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or any value within the range obtained by combining any two of the above values.

[0127] It should be understood that in the embodiment of the present application, the distance D1 between the first bottom wall 1211 of the first groove 121 and the surface of the support component 12 close to the battery cell 20 can be the maximum value, minimum value or average value between the first bottom wall 1211 of the first groove 121 and the surface of the support component 12 close to the battery cell 20.

[0128] In the embodiment of the present application, by setting the distance D1 between the first bottom wall 1211 of the first groove 121 and the surface of the support component 12 close to the battery cell 20 to 20%-90% of the thickness D2 of the support component 12, the risk of the support component 12 breaking when the battery 10 is subjected to vibration or impact can be effectively reduced. At the same time, the risk of the adhesive 112 overflowing to the area where the pressure relief mechanism 213 of the battery cell 20 is located can be effectively reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism 213, thereby improving the performance of the battery 10.

[0129] In some implementations, as shown in Figures 12 to 15, the ratio of the dimension W1 of the first groove 121 along the direction perpendicular to the extension of the first groove 121 to the viscosity P of the adhesive 112 is greater than or equal to 0.001. For example, the ratio of the dimension W1 of the first groove 121 along the direction perpendicular to the extension of the first groove 121 to the viscosity P of the adhesive 112 in the embodiment of the present application can be set to: 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.1, etc., or its value is within the range obtained by combining any two of the above values.

[0130] It should be understood that in the embodiment of the present application, the dimension W1 of the first groove 121 along the extension direction perpendicular to the first groove 121 can be the maximum value, minimum value or average value of the dimension of the first groove 121 along the extension direction perpendicular to the first groove 121.

[0131] In the embodiment of the present application, by setting the ratio between the dimension W1 of the first groove 121 along the extension direction perpendicular to the first groove 121 and the viscosity P of the adhesive 112 to be greater than or equal to 0.001, when the battery 10 is subjected to vibration or impact and other working conditions, the risk of the adhesive 112 being difficult to overflow into the first groove 121 due to the large viscosity P of the adhesive 112 can be reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism 213, thereby improving the performance of the battery 10.

[0132] In some implementations, as shown in Figures 12 to 15, the ratio of the dimension W1 of the first groove 121 along the direction perpendicular to the extension of the first groove 121 to the viscosity P of the adhesive 112 is greater than or equal to 0.005. For example, the ratio of the dimension W1 of the first groove 121 along the direction perpendicular to the extension of the first groove 121 to the viscosity P of the adhesive 112 in the embodiment of the present application can be set to: 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.1, etc., or its value is within the range obtained by combining any two of the above values.

[0133] In the embodiment of the present application, by setting the ratio between the dimension W1 in the extension direction of the first groove 121 and the viscosity P of the adhesive 112 to be greater than or equal to 0.005, when the battery 10 is subjected to working conditions such as vibration or impact, the risk of the adhesive 112 being difficult to overflow into the first groove 121 due to the large viscosity P of the adhesive 112 can be effectively reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism 213, thereby improving the performance of the battery 10.

[0134] Specifically, in some implementations, when the dimension W1 of the first groove 121 along the extension direction perpendicular to the first groove 121 is set to different values, the glue overflow test results of the battery 10 in the area where the pressure relief mechanism 213 is located under the same experimental conditions are shown in Table 1.

[0135] Table 1

[0136] Specifically, the adhesive 112 used to bond the support member 12 to the first wall 215 had a viscosity P of 5000 cps. Viscosity P refers to the viscosity of glue or adhesives, describing the resistance of liquid glue to an applied force. The viscosity P is related to the fluidity and adhesion of the glue and is typically used to measure the adhesive properties of the glue under different conditions. The support member 12 had a length and width of 200 mm and 400 mm, respectively. A rectangular through-hole was provided in the center of the support member 12, with a length and width of 23 mm and 80 mm, respectively. The distance between the sidewall of the first groove 121 adjacent to the rectangular through-hole and the inner wall of the rectangular through-hole adjacent to the first groove 121 was 10 mm. During the experiment, a 10 kg pressure block was used to apply pressure. The adhesive overflow from the first groove 121 was tested under different experimental conditions with the dimension W1 of the first groove 121 perpendicular to its extension set to different values.

[0137] As shown in Table 1 above, the first column of data represents the values ​​of the viscosity P of the adhesive 112 used in different embodiments and comparative examples; the second column of data represents the values ​​of the dimension W1 of the first groove 121 in the extension direction perpendicular to the first groove 121 in different embodiments and comparative examples; the third column of data represents the ratio between the dimension W1 of the first groove 121 in the extension direction perpendicular to the first groove 121 and the viscosity P of the adhesive 112 in different embodiments and comparative examples; the fourth column represents the glue overflow test results of different embodiments and comparative examples, wherein glue overflow refers to the adhesive 112 located between the support component 12 and the first wall 215 from the support component 12, and the overflowed adhesive 112 moves toward the area close to the pressure relief mechanism 213; interference means that in the case of glue overflow, the overflowed adhesive 112 moves to the area where the pressure relief mechanism 213 is located, for example, the first through hole 122 is blocked, thereby affecting the actuation performance of the pressure relief mechanism 213; similarly, no interference means that in the case of glue overflow, the overflowed adhesive 112 does not move to the area where the pressure relief mechanism 213 is located, and does not affect the actuation performance of the pressure relief mechanism 213; no glue overflow means that the adhesive 112 located between the support component 12 and the first wall 215 does not overflow from the first groove 121 on the support component 12.

[0138] As shown in Table 1 above, it can be seen from Comparative Example 1 and Comparative Example 2, as well as Examples 1 to 8, that as the dimension W1 of the first groove 121 along the extending direction perpendicular to the first groove 121 increases, when the ratio between the dimension W1 of the first groove 121 along the extending direction perpendicular to the first groove 121 and the adhesive viscosity P of the adhesive 112 is less than or equal to 0.0008, there is an overflow phenomenon at the first groove 121, and the overflowed adhesive 112 moves to the area where the pressure relief mechanism 213 is located, and blocks the through hole corresponding to the pressure relief mechanism 213, affecting the actuation performance of the pressure relief mechanism 213; when the first groove When the ratio between the dimension W1 of the first groove 121 along the extension direction perpendicular to the first groove 121 and the viscosity P of the adhesive 112 is greater than or equal to 0.001 and less than or equal to 0.004, there is also glue overflow at the first groove 121, but the overflowed adhesive 112 does not move to the area where the pressure relief mechanism 213 is located, and does not affect the actuation performance of the pressure relief mechanism 213; when the ratio between the dimension W1 of the first groove 121 along the extension direction perpendicular to the first groove 121 and the viscosity P of the adhesive 112 is greater than or equal to 0.005, there is no glue overflow at the first groove 121.

[0139] In some implementations, as shown in FIG. 4 to FIG. 11 , the support component 12 is provided with a first through hole 122 corresponding to the pressure relief mechanism 213 .

[0140] It should be understood that in the embodiment of the present application, the shape of the first through hole 122 in the direction perpendicular to the thickness of the support component 12 can be set according to actual needs. For example, the shape of the first through hole 122 can be set according to the shape of the pressure relief mechanism 213 of the battery cell 20. Exemplarily, the shape of the first through hole 122 includes but is not limited to a circle, an ellipse, a rectangle, and a regular polygon.

[0141] It should also be understood that in the embodiment of the present application, the first through hole 122 corresponding to the pressure relief mechanism 213 is provided on the support component 12, which means that the orthographic projection of the first through hole 122 on the plane perpendicular to the thickness direction of the support component 12 can be greater than, less than or equal to the orthographic projection of the pressure relief mechanism 213 on the plane perpendicular to the thickness direction of the support component 12.

[0142] In the embodiment of the present application, a first through hole 122 corresponding to the pressure relief mechanism 213 is provided on the support component 12. When the pressure relief mechanism 213 of the battery cell 20 is actuated, the exhaust gas discharged by the pressure relief mechanism 213 can be discharged smoothly through the first through hole 122, so as to reduce the thermal impact on the battery cell 20, thereby improving the performance of the battery 10.

[0143] In some implementations, as shown in Figures 7 to 15, the distance L3 between the first side wall 1212 of the first groove 121 near the first through hole 122 and the inner wall 1221 of the first through hole 122 near the first groove 121 accounts for 15%-91% of the length L2 of the battery cell 20.

[0144] It should be understood that in the embodiment of the present application, the distance L3 between the first side wall 1212 of the first groove 121 close to the first through hole 122 and the inner wall 1221 of the first through hole 122 close to the first groove 121 may refer to the maximum distance, minimum distance or average distance between the first side wall 1212 of the first through hole 122 and the inner wall 1221 of the first through hole 122 close to the first groove 121.

[0145] For example, in an embodiment of the present application, the ratio of the distance L3 between the first side wall 1212 of the first groove 121 close to the first through hole 122 and the inner wall 1221 of the first through hole 122 close to the first groove 121 to the length L2 of the battery cell 20 can be set to: 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.91, or its value is within the range obtained by combining any two of the above values.

[0146] In the embodiment of the present application, by making the distance L3 between the first side wall 1212 of the first groove 121 close to the first through hole 122 and the inner wall 1221 of the first through hole 122 close to the first groove 121 account for 15%-91% of the length L2 of the battery cell 20, when the battery 10 is subjected to vibration or impact and other working conditions, the risk of the adhesive 112 overflowing to the area where the pressure relief mechanism 213 of the battery cell 20 is located can be reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism 213, thereby improving the performance of the battery 10.

[0147] Specifically, in some implementations, when the distance L3 between the first side wall 1212 of the first groove 121 near the first through hole 122 and the inner wall 1221 of the first through hole 122 near the first groove 121 is set to different values, the glue overflow test results of the battery 10 in the area where the pressure relief mechanism 213 is located under the same experimental conditions are shown in Table 2.

[0148] Table 2

[0149] Specifically, the selected battery 10 has a length, width and height of 220 mm, 44 mm and 100 mm respectively, and is a lithium iron phosphate battery with an energy density of 180 Wh / kg. The thickness of the adhesive 112 between the support component 12 and the first wall 215 is 0.8 mm, the thickness of the isolation component 13 is 1 mm, and the width is 120 mm. A rectangular through hole is set in the middle position of the support component 12, and the length and width of the rectangular through hole are 80 mm and 80 mm respectively. The length and width of the pressure relief mechanism 213 on the first wall 215 of the battery cell 20 are 70 mm and 60 mm. During the experiment, a pressure of 3000 N was applied to the battery 10 in the thickness direction of the support component 12, the pressure was maintained for 12 hours, and the glue overflow in the first groove 121 was detected.

[0150] As shown in Table 2 above, the first column of data represents the values ​​of the length L2 of the battery cell 20 used in different embodiments and comparative examples; the second column of data represents the values ​​of the distance L3 between the side wall 1212 of the first groove 121 close to the first through hole 122 and the inner wall 1221 of the first through hole 122 close to the first groove 121 in different embodiments and comparative examples; the third column of data represents the values ​​of the distance L3 between the first side wall 1212 of the first groove 121 close to the first through hole 122 and the inner wall 1221 of the first through hole 122 close to the first groove 121 in different embodiments and comparative examples. The fourth column shows the glue overflow test results of different embodiments and comparative examples, wherein glue overflow refers to the adhesive 112 between the support component 12 and the first wall 215 overflowing from the first groove 121 on the support component 12, and the overflowed adhesive 112 moves toward the area close to the pressure relief mechanism 213; no glue overflow refers to the adhesive 112 between the support component 12 and the first wall 215 not overflowing from the first groove 121 on the support component 12.

[0151] As shown in Table 2 above, it can be seen from Comparative Examples 1 to Comparative Examples 4, and Examples 1 to Example 6 that as the value of the distance L3 between the first side wall 1212 of the first groove 121 close to the first through hole 122 and the inner wall 1221 of the first through hole 122 close to the first groove 121 increases, when the distance L3 between the first side wall 1212 of the first groove 121 close to the first through hole 122 and the inner wall 1221 of the first through hole 122 close to the first groove 121 is equal to the length L of the battery cell 20. 2 is less than or equal to 0.145, there is glue overflow at the first groove 121, and the overflowed adhesive 112 moves toward the area where the pressure relief mechanism 213 is located; when the ratio of the distance L3 between the first side wall 1212 of the first groove 121 close to the first through hole 122 and the inner wall 1221 of the first through hole 122 close to the first groove 121, to the length L2 of the battery cell 20 is greater than or equal to 0.15 and less than or equal to 0.91, there is no glue overflow at the first groove 121.

[0152] In some implementations, as shown in Figures 7 to 11 , on a plane perpendicular to the extension direction of the first groove 121, the shape of the first groove 121 is one of the following shapes: a rectangle, a square, an inverted triangle, a trapezoid, or a semicircle. Thus, in the embodiment of the present application, by forming the first groove 121 into one of the following shapes: a rectangle, a square, an inverted triangle, a trapezoid, or a semicircle on a plane perpendicular to the extension direction of the first groove 121, the processing and manufacturing of the battery 10 can be facilitated, while also reducing the processing cost of the battery 10.

[0153] In some implementations, as shown in Figures 4 to 11, the battery 10 also includes an isolation component 13, which is connected between the support component 12 and the first wall 215. The isolation component 13 is configured to prevent the adhesive 112 from being applied to the area where the pressure relief mechanism 213 is located.

[0154] It should be understood that in the embodiment of the present application, the isolation component 13 and the support component 12 can be adhesively connected. For example, the isolation component 13 and the support component 12 can be connected by an adhesive 112.

[0155] It should also be understood that the material of the isolation component 13 in the embodiment of the present application includes at least one of the following materials: polyurethane, polyamide, polypropylene, silicone foam, polycarbonate, polyethylene terephthalate, mica, glass fiber, ceramic fiber, and polyethylene epoxy resin.

[0156] In an embodiment of the present application, an isolation component 13 is provided in the battery 10, and the isolation component 13 is connected between the support component 12 and the first wall 215. The isolation component 13 is configured to prevent the adhesive 112 from being applied to the area where the pressure relief mechanism 213 is located. When the battery 10 is subjected to vibration or impact and other working conditions, the risk of the adhesive 112 overflowing to the area where the pressure relief mechanism 213 of the battery cell 20 is located can be effectively reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism 213, thereby improving the performance of the battery 10.

[0157] In some implementations, as shown in FIG. 4 to FIG. 11 , the support member 12 includes a plurality of the first grooves 121 , and on a plane perpendicular to the thickness direction of the support member 12 , the projection of the isolation member 13 covers at least one of the plurality of the first grooves 121 .

[0158] It should be understood that in the embodiment of the present application, the projection of the isolation part 13 or the first groove 121 on the plane perpendicular to the thickness direction of the support part 12 can be a positive projection in the thickness direction, or the projection of the isolation part 13 or the first groove 121 on the plane perpendicular to the thickness direction of the support part 12 can also be a projection in other directions.

[0159] It should also be understood that in the embodiment of the present application, the projection of the isolation component 13 covering at least one of the multiple first grooves 121 may mean that the projection of the isolation component 13 covers the projection of at least one of the multiple first grooves 121.

[0160] In an embodiment of the present application, the support component 12 includes a plurality of first grooves 121. On a plane perpendicular to the thickness direction of the support component 12, by covering at least one of the plurality of first grooves 121 with the projection of the isolation component 13, when the battery 10 is subjected to vibration or impact and other working conditions, the risk of the adhesive 112 overflowing to the area where the pressure relief mechanism 213 of the battery cell 20 is located can be effectively reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism 213, thereby improving the performance of the battery 10.

[0161] FIG15 shows a schematic cross-sectional view of a battery 10 provided in another embodiment of the present application. For example, FIG15 may be a schematic cross-sectional view of a corresponding portion of the battery 10 in FIG4 along a direction perpendicular to the Z direction.

[0162] In some implementations, multiple first grooves 121 are provided around the pressure relief mechanism 213. For example, as shown in FIG15 , multiple first grooves 121 can be provided around the pressure relief mechanism 213 to accommodate a portion of the adhesive 112 between the first wall 215 and the support member 12. The shape of the multiple first grooves 121 on a plane perpendicular to the height direction of the battery 10 can be annular or a hollow square.

[0163] In the embodiment of the present application, by arranging the plurality of first grooves 121 around the pressure relief mechanism 213, when the battery 10 is subjected to working conditions such as vibration or impact, the risk of the adhesive 112 overflowing to the area where the pressure relief mechanism 213 of the battery cell 20 is located can be further reduced, thereby reducing the impact on the actuation performance of the pressure relief mechanism 213, thereby improving the performance of the battery 10.

[0164] In some embodiments, as shown in Figures 5 and 6, the isolation component 13 is provided with a second groove 130 opening toward the battery cell 20, at least a portion of the second side wall 131 of the second groove 130 is located within the first through hole 122, and the outer edge 132 of the second groove 130 is connected to the second side wall 131 and is arranged between the support component 12 and the first wall 215.

[0165] In an embodiment of the present application, the isolation component 13 is set to a second groove 130 with an opening toward the battery cell 20, at least a portion of the second side wall 131 of the second groove 130 is located in the first through hole 122, and the outer edge 132 of the second groove 130 is connected to the second side wall 131 and is arranged between the support component 12 and the first wall 215. When the support component 12 is configured to be attached to the first wall 215 by an adhesive 112, the adhesive 112 can be effectively prevented from being applied between the support component 12 and the pressure relief mechanism 213, thereby reducing the impact of the adhesive 112 entering the area where the pressure relief mechanism 213 is located on the actuation performance of the pressure relief mechanism 213, thereby improving the performance of the battery 10.

[0166] In some implementations, the second bottom wall 133 of the second groove 130 is provided with a second through hole 123 corresponding to the pressure relief mechanism 213 .

[0167] It should be understood that in the embodiment of the present application, the shape of the second bottom wall 133 of the second groove 130 can be set according to actual needs. For example, the shape of the second bottom wall 133 of the second groove 130 includes but is not limited to a circle, an ellipse, a rectangle, and a regular polygon.

[0168] It should also be understood that in the embodiment of the present application, the shape of the second through hole 123 in the direction perpendicular to the thickness of the support component 12 can be set according to actual needs. For example, the shape of the second through hole 123 can be set according to the shape of the pressure relief mechanism 213 of the battery cell 20. Exemplarily, the shape of the second through hole 123 includes but is not limited to a circle, an ellipse, a rectangle, and a regular polygon.

[0169] In the embodiment of the present application, a second through hole 123 corresponding to the pressure relief mechanism 213 is provided on the second bottom wall 133 of the second groove 130, so that the emissions from the battery cell 20 can quickly pass through the isolation component 13, so that the emissions can be discharged in time, reducing the impact of the accumulation of the emissions in the second groove 130 on the actuation performance of the pressure relief mechanism 213, thereby reducing the thermal impact on the battery cell 20 and improving the performance of the battery 10.

[0170] In some implementations, as shown in FIG5 , the second bottom wall 133 of the second groove 130 is configured to be damaged by the discharge from the battery cell 20 when the pressure relief mechanism 213 is actuated, allowing the discharge to pass through the isolation component 13. Thus, in the embodiment of the present application, by configuring the second bottom wall 133 of the second groove 130 to be damaged by the discharge from the battery cell 20 when the pressure relief mechanism 213 is actuated, and allowing the discharge to pass through the isolation component 13, the discharge can be discharged in a timely manner, reducing the impact of the accumulation of the discharge in the second groove 130 on the actuation performance of the pressure relief mechanism 213, thereby reducing the thermal impact on the battery cell 20 and improving the performance of the battery 10.

[0171] In some implementations, as shown in FIG. 5 , the second bottom wall 133 of the second groove 130 is provided with a weakened area 134 . The weakened area 134 is configured to be destroyed by the exhaust when the pressure relief mechanism 213 is actuated, so as to allow the exhaust to pass through the isolation component 13 .

[0172] It should be understood that in the embodiment of the present application, at least a portion of the second bottom wall 133 of the second groove 130 can be set as a weak area 134 so that it can be destroyed by the discharge when the pressure relief mechanism 213 is actuated, allowing the discharge to pass through the weak area 134.

[0173] It should also be understood that in the embodiment of the present application, in the thickness direction of the second bottom wall 133 perpendicular to the second groove 130, the shape of the weak area 134 can be set according to actual needs. For example, the shape of the weak area 134 can be set according to the shape of the pressure relief mechanism 213 of the battery cell 20. Exemplarily, the shape of the weak area 134 includes but is not limited to a circle, an ellipse, a rectangle, and a regular polygon.

[0174] It should also be understood that the number of the weak areas 134 provided on the second bottom wall 133 of the second groove 130 can be set according to actual needs. For example, the number of the weak areas 134 can be one or more.

[0175] In an embodiment of the present application, a weak area 134 is provided on the second bottom wall 133 of the second groove 130, and the weak area 134 is configured to be destroyed by the discharge when the pressure relief mechanism 213 is actuated, that is, when the internal pressure or temperature of the battery cell 20 reaches a threshold value, the discharge can pass through the isolation component 13 in a timely and rapid manner to achieve rapid pressure relief of the battery cell 20, effectively reducing the impact of the accumulation of the discharge in the second groove 130 on the actuation performance of the pressure relief mechanism 213, thereby improving the performance of the battery 10.

[0176] In some implementations, the weak zone 134 satisfies at least one of the following: the melting point of the material of the weak zone 134 is lower than the melting point of the material of the rest of the isolation component 13; the thickness of the weak zone 134 is lower than the thickness of the rest of the isolation component 13; the surface of the weak zone 134 perpendicular to the thickness direction of the isolation component 13 is provided with notches.

[0177] It should be understood that in the embodiment of the present application, the melting point of the material in the weak region 134 can be set to be less than or equal to a preset threshold value. This allows the weak region 134 to be more easily melted by the exhaust released through the pressure relief mechanism 213 than by the rest of the isolation component 13 when the pressure relief mechanism 213 is actuated. Furthermore, the thickness of the weak region 134 can be set to be thinner than the thickness of the rest of the isolation component 13. Because the weak region 134 is thinner than the rest of the isolation component 13, when the pressure relief mechanism 213 is actuated, the weak region 134 is more easily destroyed by the exhaust released through the pressure relief mechanism 213 than by the rest of the isolation component 13.

[0178] It should also be understood that in the embodiment of the present application, the shape of the notch provided on the surface of the weak zone 134 in the thickness direction perpendicular to the bottom wall 133 of the second groove 130 can be set according to actual needs. For example, the notch includes but is not limited to a cross notch, a rice notch, and an I-shaped notch.

[0179] In the embodiment of the present application, the weak zone 134 is set to at least one of the following: the melting point of the material of the weak zone 134 is lower than the melting point of the material of the rest of the isolation component 13; the thickness of the weak zone 134 is lower than the thickness of the rest of the isolation component 13; the surface of the weak zone 134 perpendicular to the thickness direction of the isolation component 13 is provided with notches, so that the weak zone 134 is more easily destroyed by the emissions of the battery cell 20 than the rest of the isolation component 13, and when the internal pressure or temperature of the battery cell 20 reaches a threshold value, the emissions can pass through the weak zone 134 in a timely and rapid manner to achieve rapid pressure relief of the battery cell 20, reduce the influence of the accumulation of the emissions on the actuation performance of the pressure relief mechanism 213 of the isolation component 13 close to the battery cell 20, and thereby improve the performance of the battery 10.

[0180] Referring again to Figures 4 to 14 , a battery 10 is provided, comprising: a battery cell 20, a support member 12, and a separator 13. A first wall 215 of the battery cell 20 is provided with a pressure relief mechanism 213. The support member 12 is used to support the battery cell 20 and is attached to the first wall 215 via an adhesive 112. The support member 12 is provided with a first through hole 122 corresponding to the pressure relief mechanism 213. The separator 13 is connected between the support member 12 and the first wall. The separator 13 is configured to prevent the adhesive 112 from being applied to the area where the pressure relief mechanism 213 is located. A surface of the support member 12 proximate the battery cell 20 is provided with a first groove 121 that opens toward the battery cell 20 and is configured to accommodate a portion of the adhesive 112. The first groove 121 extends along the length of the battery cell 20 or along the width of the battery cell 20. The dimension L1 of the first groove 121 along its extension direction is greater than or equal to the width W2 of the battery cell 20. The distance D1 between the first bottom wall 1211 of the first groove 121 and the surface of the support member 12 adjacent to the battery cell 20 is 20% to 90% of the thickness D2 of the support member 12. The ratio of the dimension W1 of the first groove 121 along a direction perpendicular to the extension direction of the first groove 121 to the viscosity P of the adhesive 112 is greater than or equal to 0.005. The distance L3 between the first sidewall 1212 of the first groove 121 adjacent to the first through hole 122 and the inner wall 1221 of the first through hole 122 adjacent to the first groove 121 is 15% to 91% of the length L2 of the battery cell 20. The support member 12 includes multiple first grooves 121. On a plane perpendicular to the thickness of the support member 12, the projection of the isolation member 13 covers at least one of the multiple first grooves 121.

[0181] The present application also provides an electrical device including the battery 10 of any of the above embodiments, wherein the battery 10 is used to provide power to the electrical device. Specifically, the electrical device may be the vehicle 1 shown in FIG1 , or any electrical device using the battery 10 .

[0182] An embodiment of the present application further provides an energy storage device, comprising the battery 10 in any of the above embodiments, wherein the battery 10 is used to store electrical energy for the energy storage device.

[0183] Although the present application has been described with reference to the above-described embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the embodiments of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A battery, characterized in that: include: A battery cell (20), wherein a first wall (215) of the battery cell (20) is provided with a pressure relief mechanism (213); a support member (12) for supporting the battery cell (20), wherein the support member (12) is attached to the first wall (215) via an adhesive (112); The surface of the support component (12) close to the battery cell (20) is provided with a first groove (121) opening toward the battery cell (20), and the first groove (121) is used to accommodate a portion of the adhesive (112).

2. The battery according to claim 1, characterized in that The first groove (121) extends along the length direction of the battery cell (20), or the first groove (121) extends along the width direction of the battery cell (20).

3. The battery according to claim 1 or 2, characterized in that A dimension L1 of the first groove (121) along an extension direction of the first groove (121) is greater than or equal to a width W2 of the battery cell (20).

4. The battery according to any one of claims 1 to 3, characterized in that A distance D1 between the first bottom wall (1211) of the first groove (121) and the surface of the support component (12) close to the battery cell (20) accounts for 20%-90% of the thickness D2 of the support component (12).

5. The battery according to any one of claims 1 to 4, characterized in that The ratio between a dimension W1 of the first groove (121) along an extension direction perpendicular to the first groove (121) and a viscosity P of the adhesive (112) is greater than or equal to 0.

001.

6. The battery according to claim 5, characterized in that The ratio between a dimension W1 of the first groove (121) along an extension direction perpendicular to the first groove (121) and a viscosity P of the adhesive (112) is greater than or equal to 0.

005.

7. The battery according to any one of claims 1 to 6, characterized in that The supporting component (12) is provided with a first through hole (122) corresponding to the pressure relief mechanism (213).

8. The battery according to claim 7, characterized in that A distance L3 between a first side wall (1212) of the first groove (121) close to the first through hole (122) and an inner wall (1221) of the first through hole (122) close to the first groove (121) accounts for 15%-91% of a length L2 of the battery cell (20).

9. The battery according to any one of claims 1 to 8, characterized in that On a plane perpendicular to the extension direction of the first groove (121), the shape of the first groove (121) is one of the following shapes: rectangle, square, inverted triangle, trapezoid or semicircle.

10. The battery according to claim 8, characterized in that The battery further includes an isolation component (13), the isolation component (13) being connected between the support component (12) and the first wall (215), and the isolation component (13) being configured to prevent the adhesive (112) from being applied to the area where the pressure relief mechanism (213) is located.

11. The battery according to claim 10, characterized in that The support component (12) includes a plurality of first grooves (121), and on a plane perpendicular to the thickness direction of the support component (12), a projection of the isolation component (13) covers at least one of the plurality of first grooves (121).

12. The battery according to claim 11, characterized in that A plurality of the first grooves (121) are arranged around the pressure relief mechanism (213).

13. The battery according to any one of claims 10 to 12, characterized in that The isolation component (13) is provided with a second groove (130) opening toward the battery cell (20), and at least a portion of a second side wall (131) of the second groove (130) is located in the first through hole (122). Inside, the outer edge (132) of the second groove (130) is connected to the second side wall (131) and is arranged between the supporting component (12) and the first wall (215).

14. The battery according to claim 13, characterized in that The second bottom wall (133) of the second groove (130) is provided with a second through hole (123) corresponding to the pressure relief mechanism (213).

15. The battery according to claim 13, characterized in that The second bottom wall (133) of the second groove (130) is configured to be destroyed by the discharge from the battery cell (20) when the pressure relief mechanism (213) is actuated, so that the discharge passes through the isolation component (13).

16. The battery according to claim 15, characterized in that The second bottom wall (133) of the second groove (130) is provided with a weakened area (134), and the weakened area (134) is configured to be destroyed by the discharge when the pressure relief mechanism (213) is actuated, so that the discharge passes through the isolation component (13).

17. The battery according to claim 16, characterized in that The weak area (134) satisfies at least one of the following: The melting point of the material of the weak area (134) is lower than that of the rest of the isolation component (13) The melting point of the material; The thickness of the weakened area (134) is smaller than the thickness of the remaining portion of the isolation component (13); The surface of the weak area (134) in a direction perpendicular to the thickness of the isolation component (13) is provided with notches.

18. An electrical device, characterized in that: include: The battery according to any one of claims 1 to 17, wherein the battery is used to provide electrical energy to the electrical device.

19. An energy storage device, characterized in that: include: The battery according to any one of claims 1 to 17, wherein the battery is used to store electrical energy for the energy storage device.

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