CN220934324U - Battery, electric equipment and energy storage equipment - Google Patents
Battery, electric equipment and energy storage equipment Download PDFInfo
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- CN220934324U CN220934324U CN202420332539.6U CN202420332539U CN220934324U CN 220934324 U CN220934324 U CN 220934324U CN 202420332539 U CN202420332539 U CN 202420332539U CN 220934324 U CN220934324 U CN 220934324U
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- battery cell
- adhesive
- support member
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Landscapes
- Battery Mounting, Suspending (AREA)
Abstract
The embodiment of the application provides a battery, electric equipment and energy storage equipment, which can improve the service performance of the battery. The battery includes: a battery cell, wherein a first wall of the battery cell is provided with a pressure relief mechanism; a support member for supporting the battery cell, the support member being attached to the first wall by an adhesive; the surface of the supporting part, which is close to the battery cell, is provided with a first groove, which is open towards the battery cell and is used for accommodating part of the adhesive.
Description
Technical Field
The embodiment of the application relates to the technical field of batteries, in particular to a battery, electric equipment and energy storage equipment.
Background
With the increasing increase of environmental pollution, the new energy industry is receiving more and more attention. In the new energy industry, battery technology is an important factor in its development. In addition to improving the electrical performance of batteries, safety issues are also a non-negligible issue in the development of battery technology. If the safety problem of the battery cannot be guaranteed, the battery cannot be used, and the service performance of the battery is reduced.
Therefore, how to improve the service performance of the battery has become a technical problem to be solved in the art.
Disclosure of utility model
In view of the above, the embodiment of the application provides a battery, electric equipment and energy storage equipment, which can improve the service performance of the battery.
In a first aspect, there is provided a battery comprising: a battery cell, wherein a first wall of the battery cell is provided with a pressure relief mechanism; a support member for supporting the battery cell, the support member being attached to the first wall by an adhesive; the surface of the supporting part, which is close to the battery cell, is provided with a first groove, which is open towards the battery cell and is used for accommodating part of the adhesive.
In the embodiment of the application, the first groove with the opening facing the battery monomer is arranged on the surface, close to the battery monomer, of the supporting part of the battery, and is used for containing the adhesive between part of the first wall and the supporting part, so that the risk that the adhesive overflows to the area where the pressure release mechanism of the battery monomer is located can be reduced under the working conditions of vibration or impact and the like of the battery, the influence on the actuation performance of the pressure release mechanism is reduced, the service performance of the battery is improved, meanwhile, the structure is simple to realize, the process complexity of battery processing and manufacturing can be effectively reduced, and the processing cost and the weight of the battery are reduced.
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.
In the embodiment of the application, the first groove is arranged along the length direction of the battery unit in an extending manner or the first groove is arranged along the width direction of the battery unit in an extending manner, so that the processing and manufacturing of the battery are facilitated, and meanwhile, the processing cost of the battery 10 can be reduced.
In some implementations, a dimension L 1 of the first groove along the direction of extension of the first groove is greater than or equal to the width W 2 of the battery cell. Thus, in the embodiment of the application, by setting the dimension L 1 of the first groove along the extending direction of the first groove to be greater than or equal to the width W 2 of the battery cell, the adhesive between the supporting member and the first wall can overflow to the first groove under the working conditions such as vibration or impact of the battery, so that the risk that the adhesive overflows to the area of the pressure release mechanism of the battery cell is effectively reduced, the influence on the actuation performance of the pressure release mechanism is reduced, and the service performance of the battery is improved.
In some implementations, the distance D 1 between the first bottom wall of the first recess and the surface of the support member proximate the battery cell is 20% -90% of the thickness D 2 of the support member.
In the embodiment of the application, the distance D 1 between the first bottom wall of the first groove and the surface, close to the battery monomer, of the supporting part is set to be 20% -90% of the thickness D 2 of the supporting part, so that the risk of breakage of the supporting part under the working conditions of vibration, impact and the like of the battery can be effectively reduced, and meanwhile, the risk of overflowing the adhesive to the area of the pressure release mechanism of the battery monomer can be effectively reduced, so that the influence on the actuation performance of the pressure release mechanism is reduced, and the service performance of the battery is improved.
In some implementations, a ratio between a dimension W 1 of the first groove along a direction perpendicular to an extension of the first groove and an adhesiveness P of the adhesive is greater than or equal to 0.001. Thus, in the embodiment of the application, by setting the ratio between the dimension W 1 of the first groove along the extending direction perpendicular to the first groove and the adhesiveness P of the adhesive to be greater than or equal to 0.001, under the working conditions of vibration or impact and the like of the battery, the risk that the adhesive is difficult to overflow into the first groove due to the greater adhesiveness P of the adhesive can be reduced, so that the influence on the actuation performance of the pressure release mechanism is reduced, and the service performance of the battery is improved.
In some implementations, a ratio between a dimension W 1 of the first groove along a direction perpendicular to an extension of the first groove and an adhesiveness P of the adhesive is greater than or equal to 0.005. Thus, in the embodiment of the application, by setting the ratio between the dimension W 1 of the first groove along the extending direction perpendicular to the first groove and the adhesiveness P of the adhesive to be greater than or equal to 0.005, under the working conditions of vibration or impact and the like of the battery, the risk that the adhesive is difficult to overflow into the first groove due to the greater adhesiveness P of the adhesive can be effectively reduced, so that the influence on the actuation performance of the pressure release mechanism is reduced, and the service performance of the battery is improved.
In some implementations, the support member is provided with a first through hole corresponding to the pressure relief mechanism. In this way, in the embodiment of the application, the first through hole corresponding to the pressure release mechanism is arranged on the supporting component, so that the discharged matter discharged by the pressure release mechanism can be smoothly discharged through the first through hole when the pressure release mechanism of the battery unit is actuated, thereby reducing the thermal influence on the battery unit and improving the service performance of the battery. In some implementations, a distance L 3 between a first sidewall of the first groove proximate the first through hole and an inner wall of the first through hole proximate the first groove is 15% -91% of a length L 2 of the battery cell.
In the embodiment of the application, the distance L 3 between the first side wall, close to the first through hole, of the first groove and the inner wall, close to the first groove, of the first through hole is 15% -91% of the length L 2 of the battery monomer, so that the risk that the adhesive overflows to the area where the pressure release mechanism of the battery monomer is located can be reduced under the working conditions of vibration or impact and the like of the battery, the influence on the actuation performance of the pressure release mechanism is reduced, and the service performance of the battery is improved.
In some implementations, the shape of the first groove is one of the following shapes in a plane perpendicular to the direction of extension of the first groove: rectangular, square, inverted triangular, trapezoidal or semicircular.
In an embodiment of the present application, on a plane perpendicular to an extending direction of the first groove, the first groove is formed by having one of the following shapes: rectangular, square, inverted triangular, trapezoidal or semicircular, so as to facilitate the processing and manufacturing of the battery, and simultaneously reduce the processing cost of the battery.
In some implementations, the battery further includes a spacer member coupled between the support member and the first wall, the spacer member configured to prevent the adhesive from being applied to the region where the pressure relief mechanism is located.
In the embodiment of the application, the isolating component is arranged in the battery and is connected between the supporting component and the first wall, the isolating component is configured to prevent the adhesive from being applied to the area where the pressure release mechanism is located, and the risk that the adhesive overflows to the area where the pressure release mechanism of the battery monomer is located can be effectively reduced under the working conditions of vibration, impact and the like of the battery, so that the influence on the actuation performance of the pressure release mechanism is reduced, and the service performance of the battery is improved.
In some implementations, the support member includes a plurality of the first grooves, and the projection of the spacer member covers at least one of the plurality of the first grooves on a plane perpendicular to a thickness direction of the support member.
In the embodiment of the application, the supporting component comprises a plurality of the first grooves, and the projection of the isolating component covers at least one of the plurality of the first grooves on the plane perpendicular to the thickness direction of the supporting component, so that the risk that the adhesive overflows to the area of the pressure release mechanism of the battery cell can be effectively reduced under the working conditions of vibration, impact and the like of the battery, and the influence on the actuation performance of the pressure release mechanism is reduced, thereby improving the service performance of the battery.
In some implementations, a plurality of the first grooves are disposed around the pressure relief mechanism. In this way, in the embodiment of the application, the plurality of first grooves are arranged around the pressure release mechanism, so that the risk that the adhesive overflows to the area where the pressure release mechanism of the battery monomer is located can be further reduced under the working conditions that the battery is subjected to vibration or impact and the like, the influence on the actuation performance of the pressure release mechanism is reduced, and the service performance of the battery is improved.
In some implementations, the spacer member is provided with a second groove opening toward the battery cell, at least a portion of a second sidewall of the second groove is located in the first through hole, and an outer edge of the second groove is connected to the second sidewall and disposed between the support member and the first wall.
In the embodiment of the application, the isolation part is arranged to be opened towards the second groove of the battery cell, at least part of the second side wall of the second groove is positioned in the first through hole, the outer edge of the second groove is connected with the second side wall and is arranged between the support part and the first wall, and when the support part is configured to be attached to the first wall through the adhesive, the adhesive can be effectively prevented from being applied between the support part and the pressure release mechanism, the influence on the actuation performance of the pressure release mechanism caused by the fact that the adhesive enters the area where the pressure release mechanism is positioned is reduced, and the service performance of the battery is further improved.
In some implementations, the second bottom wall of the second recess is provided with a second through hole corresponding to the pressure relief mechanism. In this way, in the embodiment of the application, the second through hole corresponding to the pressure release mechanism is arranged on the second bottom wall of the second groove, so that the discharge from the battery cell can quickly pass through the isolation part, the discharge can be discharged in time, the influence on the actuation performance of the pressure release mechanism caused by accumulation of the discharge in the second groove is reduced, the thermal influence on the battery cell is reduced, and the service performance of the battery is improved.
In some implementations, the second bottom wall of the second recess is configured to be breakable by emissions from the battery cell upon actuation of the pressure relief mechanism to pass the emissions through the isolation component.
In the embodiment of the application, the second bottom wall of the second groove is arranged to be damaged by the discharge discharged by the battery cell when the pressure release mechanism is actuated, and the discharge passes through the isolation part, so that the discharge can be discharged in time, the influence on the actuation performance of the pressure release mechanism caused by accumulation of the discharge in the second groove is reduced, the thermal influence on the battery cell is reduced, and the service performance of the battery is improved.
In some implementations, the second bottom wall of the second groove is provided with a zone of weakness configured to be breakable by the vent upon actuation of the pressure relief mechanism to allow the vent to pass through the isolation member.
In the embodiment of the application, the second bottom wall of the second groove is provided with the weak area, and the weak area is configured to be damaged by the discharge when the pressure release mechanism is actuated, namely, the discharge can timely and rapidly pass through the isolation part when the internal pressure or temperature of the battery cell reaches a threshold value, so that the rapid pressure release of the battery cell is realized, the influence on the actuation performance of the pressure release mechanism caused by the accumulation of the discharge in the second groove is effectively reduced, and the service performance of the battery is improved.
In some implementations, the region of weakness satisfies at least one of: the melting point of the material of the weakened zone is less than the melting point of the material of the rest of the barrier member; the weakened area having a thickness less than the thickness of the remainder of the isolation member; the surface of the weakened area perpendicular to the thickness direction of the spacer member is provided with a score.
In an embodiment of the application, the weakening is provided by setting the weakening as at least one of: the melting point of the material of the weakened zone is less than the melting point of the material of the rest of the barrier member; the weakened area having a thickness less than the thickness of the remainder of the isolation member; the surface of the weak area perpendicular to the thickness direction of the isolating part is provided with a notch, so that the weak area is more easily damaged by the emission of the battery unit compared with the rest part of the isolating part, and when the internal pressure or temperature of the battery unit reaches a threshold value, the emission can timely and rapidly pass through the weak area to realize the rapid pressure release of the battery unit, and the influence on the actuation performance of the pressure release mechanism caused by the accumulation of the emission on one side of the isolating part, which is close to the pressure release mechanism of the battery unit, is reduced, so that the service performance of the battery is improved.
In a second aspect, there is provided a powered device comprising a battery as described in any implementation of the first aspect for providing power to the powered device.
In some implementations, the powered device may be a vehicle, a vessel, a spacecraft, or the like.
In a third aspect, there is provided an energy storage device comprising a battery as described in any implementation of the first aspect for storing electrical energy for the energy storage device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a vehicle according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the application.
Fig. 4 is a schematic structural view of a battery according to another embodiment of the present application.
Fig. 5 is a schematic cross-sectional view of a battery according to an embodiment of the present application.
Fig. 6 is a schematic cross-sectional view of a battery according to another embodiment of the present application.
Fig. 7 is a schematic partial cross-sectional view of a battery according to another embodiment of the present application.
Fig. 8 is a schematic partial cross-sectional view of a battery according to another embodiment of the present application.
Fig. 9 is a schematic partial cross-sectional view of a battery according to another embodiment of the present application.
Fig. 10 is a schematic partial cross-sectional view of a battery according to another embodiment of the present application.
Fig. 11 is a schematic partial cross-sectional view of a battery according to another embodiment of the present application.
Fig. 12 is a schematic cross-sectional view of a battery according to another embodiment of the present application.
Fig. 13 is a schematic cross-sectional view of a battery according to another embodiment of the present application.
Fig. 14 is a schematic cross-sectional view of a battery according to another embodiment of the present application.
Fig. 15 is a schematic cross-sectional view of a battery according to another embodiment of the present application.
Reference numerals illustrate: 1-a vehicle; 10-battery; 20-battery cells; 30-a controller; 40-motor; 11-a box body; 21-a housing; 22-electrode assembly; 211-a housing; 212-cover plate; 213-a pressure relief mechanism; 221 a-a first tab; 222 a-second pole ear; 214-electrode terminals; 214 a-a positive electrode terminal; 214 b-a negative electrode terminal; 12-a support member; 13-isolating parts; 112-an adhesive; 121-a first groove; 122-a first via; 1221-inner walls of the first through-holes 122; 1211-a first bottom wall of the first recess 121; 1212-a first sidewall of the first recess 121; 130-a second groove; 131-a second sidewall of the second recess 130; 132-the outer edge of the second recess 130; 133-a second bottom wall of the second recess 130; 134-area of weakness.
In the drawings, the drawings are not drawn to scale.
Detailed Description
Implementations of the application are described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.
In the description of the embodiments of the present application, it is to be noted that, unless otherwise specified, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like are merely used for convenience in describing the application and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting embodiments of the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error.
The directional terms appearing in the following description are those directions shown in the drawings and do not limit the specific structure of the application. In the description of the embodiments of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the embodiments of the present application can be understood as appropriate by those of ordinary skill in the art.
The term "and/or" in the embodiment of the present application is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B may indicate: there are three cases, a, B, a and B simultaneously. In addition, the character "/" in the embodiment of the present application generally indicates that the front and rear association objects are in an or relationship.
Unless defined otherwise, all technical and scientific terms used in the embodiments of the application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the embodiments of the application presented herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the application; the terms "comprising" and "having" and any variations thereof in the description of the embodiments of the application and in the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.
Reference in the specification to "an embodiment" means 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 appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.
A battery in an embodiment of the present application refers to a physical module including one or more battery cells to provide electrical energy. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case can reduce the influence of liquid or other foreign matters on the charge or discharge of the battery cells.
It should be understood that the battery cells in embodiments of the present application include, but are not limited to, lithium 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 storage batteries, and the like.
In some implementations, the battery cells generally include an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.
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.
As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material is provided on either or both of the two surfaces opposing the positive electrode current collector.
As an example, the positive electrode current collector may employ a metal foil or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
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 conventional materials that may be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of the lithium-containing phosphate may include, but are not limited to, at least one of lithium iron phosphate (e.g., liFePO 4 may also be simply referred to as LFP), a composite of lithium iron phosphate and carbon, a composite of lithium manganese phosphate (e.g., liMnPO 4), a composite of lithium manganese phosphate and carbon, lithium manganese phosphate, and a composite of lithium manganese phosphate and carbon.
As an example, the positive electrode active material may include at least one of a sodium transition metal oxide, a polyanion-type compound, and a prussian blue-type compound.
In some implementations, the sodium transition metal oxide can be a doped modified sodium transition metal oxide, and the doping modification of the sodium transition metal oxide can include at least one of a sodium site doping modification, an oxygen site doping modification, a transition metal site doping modification, and a surface cladding modification.
In some implementations, the positive electrode may employ a metal foam. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon or the like. When the metal foam is used as the positive electrode, the surface of the metal foam may not be provided with the positive electrode active material, but may be provided with the positive electrode active material. As an example, a lithium source material, which is lithium metal and/or a lithium-rich material, potassium metal or sodium metal, may also be filled and/or deposited within the foam metal.
In some implementations, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector.
As an example, the negative electrode current collector may employ a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The composite current collector may include a polymeric material base layer and a metal layer. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon or the like. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
In some implementations, the battery cells in embodiments of the application may be non-negative sodium secondary batteries.
The negative electrode-free sodium secondary battery is a battery cell in which a negative electrode active material layer is not actively provided on the negative electrode side during the production of the battery cell, and for example, a sodium metal or a carbonaceous active material layer is not provided at the negative electrode by a process such as coating or deposition during the production of the battery cell to form the negative electrode active material layer. When the lithium ion battery is charged for the first time, electrons are obtained from the sodium ion at the anode side to deposit on the surface of the current collector to form a sodium metal phase, and when the lithium ion battery is discharged, metal sodium can be converted into sodium ions to return to the anode, so that the circulation charge and discharge are realized. The non-negative sodium secondary battery cell can obtain a higher energy density due to the absence of the negative electrode active material layer, compared to other sodium secondary batteries.
In some implementations, to improve cell performance, the negative side of a non-negative sodium secondary battery may be provided with some functional coating, such as carbonaceous materials, metal oxides, alloys, etc., to improve the conductivity of the negative current collector and to improve the uniformity of deposited sodium metal.
In some implementations, the material of the positive current collector may be aluminum and the material of the negative current collector may be copper.
In some implementations, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.
In some implementations, the separator is a separator film. The embodiment of the application has no special limitation on the type of the isolating membrane, and any known porous isolating membrane with good chemical stability and mechanical stability can be selected.
As an example, the main material of the separator may be at least one selected from glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.
In some implementations, the separator is a solid state electrolyte. The solid electrolyte is arranged between the anode and the cathode and plays roles in transmitting ions and isolating the anode and the cathode.
In some implementations, the battery cell also includes an electrolyte that serves to conduct ions between the positive and negative electrodes. The embodiment of the application has no specific limitation on the type of electrolyte, and can be selected according to requirements. The electrolyte may be liquid, gel or solid.
In some implementations, the electrode assembly may be a coiled structure. The positive plate and the negative plate are wound into a winding structure.
In some implementations, the electrode assembly is a lamination stack. As an example, a plurality of positive electrode sheets and negative electrode sheets may be provided, respectively, and a plurality of positive electrode sheets and a plurality of negative electrode sheets may be alternately stacked.
As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheets are folded to form a plurality of folded sections arranged in a stacked manner, with one positive electrode sheet sandwiched between adjacent folded sections.
As an example, the positive and negative electrode sheets are each folded to form a plurality of folded sections in a stacked arrangement.
As an example, the separator may be provided in plurality, respectively between any adjacent positive electrode sheet or negative electrode sheet.
As an example, the separator may be continuously provided, being disposed between any adjacent positive or negative electrode sheets by folding or winding.
In some implementations, the electrode assembly may be cylindrical in shape, flat or polygonal, etc.
In some implementations, the electrode assembly is provided with tabs that can conduct current away from the electrode assembly. The tab includes a positive tab and a negative tab.
In some implementations, the battery cell can include a housing. The case is used to encapsulate the electrode assembly, the electrolyte, and the like. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), an aluminum-plastic film or the like.
As examples, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, including a square-case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery cell, such as a hexagonal-prismatic battery cell, or the like.
In order to meet different power requirements, the battery in the embodiment of the application may include a plurality of battery cells, where the plurality of battery cells may be connected in series or parallel or in series-parallel, and the series-parallel refers to a mixture of series and parallel. In some implementations, a plurality of battery cells may be first connected in series or parallel or series-parallel to form a battery module, and then connected in series or parallel or series-parallel to form a battery. That is, a plurality of battery cells may be directly assembled into a battery, or may be assembled into a battery module first, and the battery module may be assembled into a battery. The battery is further arranged in the electric equipment to provide electric energy for the electric equipment.
In some implementations, the battery in the embodiments of the present application may be a battery module, where there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form a battery module.
In some implementations, the battery in the embodiments of the present application may be a battery pack, where the battery includes a case and a battery cell, and the battery cell or the battery module is accommodated in the case.
In some implementations, the case of embodiments of the present application may be part of the chassis structure of a vehicle. For example, a portion of the tank may become at least a portion of a floor of the vehicle, or a portion of the tank may become at least a portion of a cross member and a side member of the vehicle.
With the increasing increase of environmental pollution, the new energy industry is receiving more and more attention. In the new energy industry, battery technology is an important factor in its development. In addition to improving the electrical performance of batteries, safety issues are also a non-negligible issue in the development of battery technology. If the safety problem of the battery is not guaranteed, the battery cannot be used, and the service performance of the battery is reduced. At present, in the assembly process of a battery, a battery monomer and a supporting part are connected through an adhesive, the integral weight and the manufacturing process of the battery are considered, an isolation part is usually arranged between a pressure release mechanism of the battery monomer and the supporting part, but when the pressure born by the battery monomer is overlarge, the adhesive between the battery monomer and the supporting part overflows to the area where the pressure release mechanism is located, the pressure release mechanism is easy to block, the service performance of the pressure release mechanism is influenced, and therefore the service performance of the battery is reduced. Therefore, how to improve the service performance of the battery has become a technical problem to be solved in the art.
In view of this, an embodiment of the present application provides a battery, including: a battery cell, wherein a first wall of the battery cell is provided with a pressure relief mechanism; a support member for supporting the battery cell, the support member being attached to the first wall by an adhesive; the surface of the supporting part, which is close to the battery cell, is provided with a first groove, which is open towards the battery cell and is used for accommodating part of the adhesive. In this way, in the embodiment of the application, under the working conditions of vibration or impact and the like of the battery, the risk that the adhesive overflows to the area of the pressure release mechanism of the battery monomer can be reduced, so that the influence on the actuation performance of the pressure release mechanism is reduced, and the service performance of the battery is improved.
The technical scheme described by the embodiment of the application is suitable for various electric equipment using batteries. For example, the powered device may be a vehicle, a cellular phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting tools, grinding power tools, assembly power tools, and railroad power, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and the like.
It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described electric devices, but may be applied to all devices using batteries, and the following embodiments are described in detail by taking electric devices as an example of a vehicle for brevity.
For example, as shown in fig. 1, a schematic structural diagram of a vehicle 1 according to an embodiment of the present application is provided, where the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. The vehicle 1 may have a motor 40, a controller 30 and a battery 10 inside, the controller 30 being configured to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, for example, the battery 10 may be used as an operating power source for the vehicle 1, for circuitry of the vehicle 1, and for example, the battery 10 may be used for operating power requirements at start-up, navigation and operation of the vehicle 1. In some implementations of the application, the battery 10 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1.
In order to meet different power requirements, the battery 10 in the embodiment of the present application may include at least one battery cell group, where the battery cell group includes a plurality of battery cells, and the plurality of battery cells may be electrically connected in series or parallel or in series-parallel to form the battery 10, where series-parallel 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 may be first assembled into a battery module by series connection or parallel connection or series-parallel connection, and then assembled into the battery 10 by series connection or parallel connection or series-parallel connection. That is, a plurality of battery cells may directly constitute the battery 10, or may constitute the battery module first and then the battery module may constitute the battery 10.
In some implementations, the battery 10 may include a plurality of battery cells 20. For example, as shown in fig. 2, a battery 10 according to an embodiment of the present application may include a plurality of battery cells 20. The battery 10 may further include a case 11, in which the case 11 has a hollow structure, and the plurality of battery cells 20 are accommodated in the case 11. For example, a plurality of battery cells 20 are connected in parallel or in series-parallel combination with each other and then placed in the case 11.
In some implementations, the battery 10 may also include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus member for making electrical connection between the plurality of battery cells 20, such as parallel or series-parallel connection. Specifically, the bus member may realize electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. Further, the bus member may be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the plurality of battery cells 20 may be further drawn through the housing by a conductive mechanism. Alternatively, the conductive means may also belong to the bus bar member.
In the embodiment of the present application, the number of the battery cells 20 may be set to any value according to different power requirements. The plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, the battery cells 20 may be arranged in groups for easy installation, 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 may be set according to requirements. The battery 10 may include a plurality of battery modules that may be connected in series, parallel, or series-parallel.
As shown in fig. 3, a schematic structure 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 case 211, and a cap plate 212. The case 211 and the cover 212 form the housing 21 or the battery case. The walls of the case 211 and the walls of the cover 212 are referred to as the walls of the battery cells 20, wherein for a rectangular parallelepiped type battery cell 20, the walls of the case 211 include a bottom wall and four side walls. The case 211 is determined according to the shape of the combined one or more electrode assemblies 22, for example, the case 211 may be a hollow rectangular parallelepiped or square or cylindrical body, and one face of the case 211 has an opening so that one or more electrode assemblies 22 may be placed in the case 211. For example, when the housing 211 is a hollow rectangular parallelepiped or square, one of the planes of the housing 211 is an opening surface, i.e., the plane has no wall body so that the inside and outside of the housing 211 communicate. When the housing 211 may be a hollow cylinder, the end surface of the housing 211 is an open surface, i.e., the end surface has no wall body so that the inside and outside of the housing 211 communicate. The cap plate 212 covers the opening and is connected with the case 211 to form a closed cavity in which the electrode assembly 22 is placed. The housing 211 is filled with an electrolyte, such as an electrolyte solution.
The battery cell 20 may further include two electrode terminals 214, and the two electrode terminals 214 may be disposed on the cap plate 212. The cap plate 212 is generally in the shape of a flat plate, and two electrode terminals 214 are fixed to the flat plate surface of the cap plate 212, the two electrode terminals 214 being a positive electrode terminal 214a and a negative electrode terminal 214b, respectively. One connection member, or alternatively referred to as a current collecting member, is provided for each electrode terminal 214, which is located between the cap plate 212 and the electrode assembly 22, for electrically connecting the electrode assembly 22 and the electrode terminal 214.
As shown in fig. 3, each electrode assembly 22 has a first tab 221a and a second tab 222a. The polarities of the first tab 221a and the second tab 222a are opposite. For example, when the first tab 221a is a positive tab, the second tab 222a is a negative tab.
In the battery cell 20, the electrode assemblies 22 may be provided in a single unit, or in a plurality, according to actual use requirements, and as shown in fig. 3,2 individual electrode assemblies 22 are provided in the battery cell 20.
A pressure release mechanism 213 may also be provided on the battery cell 20. The pressure release mechanism 213 is used to actuate to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold.
The pressure relief mechanism 213 may be a variety of possible pressure relief structures. For example, the pressure release mechanism 213 may be a temperature-sensitive pressure release mechanism configured to be able to melt when the internal temperature of the battery cell 20 provided with the pressure release mechanism 213 reaches a threshold value; and/or the pressure relief mechanism 213 may be a pressure sensitive pressure relief mechanism configured to rupture when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.
Fig. 4 shows a schematic structural diagram of a battery 10 according to another embodiment of the present application. Fig. 5 shows a schematic cross-sectional view of a battery 10 according to another embodiment of the present application. Fig. 6 shows a schematic cross-sectional view of a battery 10 according to another embodiment of the present application. Fig. 7 to 11 respectively show a partial cross-sectional schematic view of a battery 10 provided in an embodiment of the present application. Illustratively, this fig. 5 may be a schematic cross-sectional view of the corresponding portion of the battery 10 in fig. 4, or this fig. 6 may be a schematic cross-sectional view of the corresponding portion of the battery 10 in fig. 4. Fig. 7 to 11 may be enlarged cross-sectional views of corresponding portions of the battery 10 of fig. 4.
In some implementations, as shown in fig. 4 to 11, the battery 10 includes a battery cell 20 and a support member 12, a first wall 215 of the battery cell 20 is provided with a pressure release mechanism 213, the support member 12 is used for supporting the battery cell 20, the support member 12 is attached to the first wall 215 by an adhesive 112, wherein a surface of the support member 12 near the battery cell 20 is provided with a first groove 121 opening toward the battery cell 20, and the first groove 121 is used for accommodating a portion of the adhesive 112.
It should be understood that, for convenience of description in the embodiment of the present application, as shown in fig. 4 to 11, the direction Z may be the thickness direction or the height direction of the battery 10, or the direction Z may also be the thickness direction of the support member 12, the direction Z being perpendicular to the direction X and the direction Y; the direction X may be a length direction of the battery 10, the direction X being perpendicular to the direction Z and the direction Y; the direction Y may be a width direction of the battery 10, and the direction Y is perpendicular to the direction Z and the direction X.
It should be appreciated that the first wall 215 in embodiments of the present application may be any one of the walls 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 a wall of the battery cell 20 having the smallest area; the first wall 215 may be a wall with the largest area of the battery cell 20; the first wall 215 may be a wall of the battery cell 20 provided with the electrode terminal 214; the first wall 215 may be a wall adjacent to the wall of the battery cell 20 where the electrode terminal 214 is disposed; the first wall may be a wall opposite to the wall of the battery cell 20 where the electrode terminal 214 is disposed.
It should also be appreciated that, in the embodiment of the present application, when the battery cell 20 has a square structure, the length direction of the battery cell 20 is perpendicular to the height direction and the width direction of the battery cell 20, the length L 2 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 L 2 of the battery cell 20 may be greater than or equal to the width W 2 of the battery cell 20.
It should also be appreciated that in embodiments of the present application, the adhesive 112 used to adhere the support member 12 to the first wall 215 includes, but is not limited to, polyurethane adhesives, acrylic adhesives, silicone adhesives.
It should also be understood that in the embodiment of the present application, the at least one first groove 121 is configured to receive a portion of the adhesive 112, and that, in a case where the battery 10 is subjected to a vibration or an impact, for example, the battery 10 is subjected to a pressure in a thickness direction of the isolating member 13, the adhesive 112 between the isolating member 13 and the first wall 215 moves toward a region where the pressure release mechanism 213 is located under the pressure, and the first groove 121 is configured to receive a portion of the adhesive 112 that moves toward the region where the pressure release mechanism 213 is located.
It should also be appreciated that in the embodiment of the present application, the shape of the bottom wall 1211 of the first groove 121 may be set according to actual requirements, for example, the shape of the bottom wall 1211 of the first groove 121 may be set according to the shape of the first through hole 122 or the shape of the pressure release mechanism 213 of the battery cell 20, and exemplary shapes of the bottom wall 1211 of the first groove 121 include, but are not limited to, a circle, an ellipse, a rectangle, and a regular polygon.
In the embodiment of the application, the surface of the supporting part 12 of the battery 10, which is close to the battery cell 20, is provided with the first groove 121 with an opening facing the battery cell 20, and the first groove 121 is used for accommodating part of the adhesive 112 between the first wall 215 and the supporting part 12, so that under the working conditions of vibration or impact and the like of the battery 10, the risk that the adhesive 112 overflows to the area of the pressure release mechanism 213 of the battery cell 20 can be reduced, the influence on the actuation performance of the pressure release mechanism 213 is reduced, the service performance of the battery 10 is improved, meanwhile, the structure is simple to realize, the processing complexity of the processing and manufacturing of the battery 10 can be effectively reduced, and the processing cost and the weight of the battery 10 are reduced.
In some implementations, the first groove 121 extends along a length direction of the battery cell 20, or the first groove 121 extends along a width direction of the battery cell 20. Thus, in the embodiment of the present application, the first groove 121 is disposed to extend along the length direction of the battery cell 20, or the first groove 121 is disposed to extend along the width direction of the battery cell 20, so as to facilitate the processing and manufacturing of the battery 10, and simultaneously reduce the processing cost of the battery 10.
Fig. 12 shows a schematic cross-sectional view of a battery 10 according to another embodiment of the present application, fig. 13 shows a schematic cross-sectional view of a battery 10 according to another embodiment of the present application, and fig. 14 shows a schematic cross-sectional view of a battery 10 according to another embodiment of the present application. For example, fig. 12 to 13 may be schematic cross-sectional views of the corresponding portion of the battery 10 in fig. 4 along a direction perpendicular to the direction Z.
In some implementations, as shown in fig. 12-14, a dimension L 1 of the first groove 121 along the extension direction of the first groove 121 is greater than or equal to the width W 2 of the battery cell 20.
It should be understood that, in the embodiment of the present application, the dimension L 1 of the first groove 121 along the extending direction of the first groove 121 may be a maximum value, a minimum value, or an average value of the dimension of the first groove 121 along the extending direction of the first groove 121.
In the embodiment of the present application, by setting the dimension L 1 of the first groove 121 along the extending direction of the first groove 121 to be greater than or equal to the width W 2 of the battery cell 20, the adhesive 112 located between the support member 12 and the first wall 215 can overflow to the first groove 121 under the working condition that the battery 10 is subjected to vibration or impact, etc., so that the risk that the adhesive 112 overflows to the area where the pressure release mechanism 213 of the battery cell 20 is located is effectively reduced, and the influence on the actuation performance of the pressure release mechanism 213 is reduced, thereby improving the service performance of the battery 10.
In some implementations, as shown in fig. 7-11, the distance D 1 between the first bottom wall 1211 of the first recess 121 and the surface of the support member 12 proximate to the battery cell 20 is 20% -90% of the thickness D 2 of the support member 12. Illustratively, the ratio between the distance D1 between the first bottom wall 1211 of the first recess 121 and the surface of the support member 12 adjacent to the battery cell 20 and the thickness D2 of the support member 12 in the embodiment of the present application may be set as: 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or a combination of any two of the foregoing.
It should be appreciated that in an embodiment of the present application, the distance D 1 between the first bottom wall 1211 of the first recess 121 and the surface of the support member 12 adjacent to the battery cell 20 may be a maximum value, a minimum value, or an average value between the first bottom wall 1211 of the first recess 121 and the surface of the support member 12 adjacent to the battery cell 20.
In the embodiment of the present application, the distance D 1 between the first bottom wall 1211 of the first groove 121 and the surface of the support member 12 near the battery cell 20 is set to be 20% -90% of the thickness D 2 of the support member 12, so that the risk of breakage of the support member 12 under the working condition that the battery 10 is subjected to vibration or impact or the like can be effectively reduced, and the risk of overflowing the adhesive 112 to the area where the pressure release mechanism 213 of the battery cell 20 is located can be effectively reduced, so as to reduce the influence on the actuation performance of the pressure release mechanism 213, thereby improving the service performance of the battery 10.
In some implementations, as shown in fig. 12 to 15, a ratio between a dimension W 1 of the first groove 121 along an extending direction perpendicular to the first groove 121 and an adhesiveness P of the adhesive 112 is greater than or equal to 0.001. Illustratively, the ratio between the dimension W 1 of the first groove 121 in the extending direction perpendicular to the first groove 121 and the adhesiveness P of the adhesive 112 in the embodiment of the present application may be set as follows: 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.1, etc., or a combination of any two of the above values.
It should be appreciated that, in an embodiment of the present application, the dimension W 1 of the first groove 121 along the direction perpendicular to the extension direction of the first groove 121 may be a maximum value, a minimum value, or an average value of the dimension of the first groove 121 along the direction perpendicular to the extension direction of the first groove 121.
In the embodiment of the present application, by setting the ratio between the dimension W 1 of the first groove 121 along the extending direction perpendicular to the first groove 121 and the adhesiveness P of the adhesive 112 to be greater than or equal to 0.001, the risk that the adhesive 112 is difficult to overflow into the first groove 121 due to the greater adhesiveness P of the adhesive 112 can be reduced under the working conditions such as vibration or impact of the battery 10, so as to reduce the influence on the actuation performance of the pressure release mechanism 213, thereby improving the service performance of the battery 10.
In some implementations, as shown in fig. 12 to 15, a ratio between a dimension W 1 of the first groove 121 along an extending direction perpendicular to the first groove 121 and an adhesiveness P of the adhesive 112 is greater than or equal to 0.005. Illustratively, the ratio between the dimension W 1 of the first groove 121 in the extending direction perpendicular to the first groove 121 and the adhesiveness P of the adhesive 112 in the embodiment of the present application may be set as follows: 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.1, etc., or a combination of any two of the above values.
In the embodiment of the present application, by setting the ratio between the width W 1 of the first groove 121 and the adhesiveness P of the adhesive 112 to be greater than or equal to 0.005, under the working conditions of vibration or impact of the battery 10, the risk that the adhesive 112 is difficult to overflow into the first groove 121 due to the greater adhesiveness P of the adhesive 112 can be effectively reduced, so as to reduce the influence on the actuation performance of the pressure release mechanism 213, thereby improving the service performance of the battery 10.
Specifically, in some implementations, in the case where the dimension W 1 of the first groove 121 in the extending direction perpendicular to the first groove 121 is set to different values, the results of the flash test of the battery 10 under the same experimental conditions in the region where the pressure release mechanism 213 is located are shown in table 1.
TABLE 1
Specifically, the adhesive agent 112 selected for bonding the support member 12 to the first wall 215 has an adhesiveness P of 5000cps, wherein the adhesiveness P refers to the viscosity or viscosity of the glue or adhesive agent, which describes the resistance of the liquid glue upon application of an external force, and the adhesiveness P relates to the fluidity and adhesiveness of the glue, and is typically used to measure the adhesive properties of the glue under different conditions. The length and width of the supporting member 12 are 200mm and 400mm respectively, a rectangular through hole is formed in the middle of the supporting member 12, the length and width of the rectangular through hole are 23mm and 80mm respectively, the distance between the side wall of the first groove 121, which is close to the rectangle, and the inner wall of the rectangular through hole, which is close to the first groove 121, is 10mm, in the experimental process, a pressing block with a weight of 10kg is used for pressing, and in the experimental condition that the dimension W 1 of the first groove 121 in the extending direction perpendicular to the first groove 121 is set to different values, the glue overflow condition of the first groove 121 is detected.
As shown in table 1, the first column data shows the values of the tackiness P of the adhesive 112 used in the examples and comparative examples; the second column data represents the values of the dimension W 1 of the first groove 121 in the different embodiments and comparative examples along the extending direction perpendicular to the first groove 121; the third column of data represents the ratio between the dimension W 1 of the first groove 121 of the different embodiment and the comparative example in the extending direction perpendicular to the first groove 121 and the tackiness P of the adhesive 112; the fourth column shows the results of the glue overflow test of the different embodiments and the comparative examples, wherein the glue overflow means that the adhesive 112 between the support member 12 and the first wall 215 overflows from the first groove 121 on the support member 12, and the overflowed adhesive 112 moves toward the area close to the pressure release mechanism 213; interference means that in case of glue overflow, the overflowed adhesive 112 moves to the area where the pressure release mechanism 213 is located, for example, plugs the first through hole 122, thereby affecting the actuation performance of the pressure release mechanism 213; similarly, the non-interference means that in the case of glue overflow, the overflowed adhesive 112 does not move to the area where the pressure release mechanism 213 is located, and the actuation performance of the pressure release mechanism 213 is not affected; no glue flash means that the adhesive 112 between the support member 12 and the first wall 215 does not spill from the first recess 121 in the support member 12.
As shown in the above table 1, as shown in comparative examples 1 and 2, and examples 1 to 8, as the dimension W 1 of the first groove 121 along the extending direction perpendicular to the first groove 121 increases, when the ratio between the dimension W 1 of the first groove 121 along the extending direction perpendicular to the first groove 121 and the adhesive P of the adhesive 112 is less than or equal to 0.0008, the adhesive overflow phenomenon exists at the first groove 121, and the overflowed adhesive 112 moves to the area where the pressure release mechanism 213 is located, and blocks the through hole corresponding to the pressure release mechanism 213, thereby affecting the actuation performance of the pressure release mechanism 213; when the ratio between the dimension W 1 of the first groove 121 along the direction perpendicular to the extending direction of the first groove 121 and the adhesiveness P of the adhesive 112 is greater than or equal to 0.001 and less than or equal to 0.004, the adhesive overflow phenomenon is also present at the first groove 121, but the overflowed adhesive 112 does not move to the area where the pressure release mechanism 213 is located, and the actuation performance of the pressure release mechanism 213 is not affected; when the ratio between the dimension W 1 of the first groove 121 along the extending direction perpendicular to the first groove 121 and the adhesiveness P of the adhesive 112 is greater than or equal to 0.005, no glue overflow phenomenon exists at the first groove 121.
In some implementations, as shown in fig. 4-11, the support member 12 is provided with a first through hole 122 corresponding to the pressure relief mechanism 213.
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 direction of the support member 12 may be set according to actual requirements, for example, the shape of the first through hole 122 may be set according to the shape of the pressure release mechanism 213 of the battery cell 20, and exemplary shapes of the first through hole 122 include, but are not limited to, a circle, an ellipse, a rectangle, and a regular polygon.
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 member 12, which means that the orthographic projection of the first through hole 122 on the plane perpendicular to the thickness direction of the support member 12 may 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 member 12.
In the embodiment of the present application, by providing the first through hole 122 corresponding to the pressure release mechanism 213 on the supporting member 12, when the pressure release mechanism 213 of the battery cell 20 is actuated, the exhaust discharged by the pressure release mechanism 213 can be smoothly discharged through the first through hole 122, so as to reduce the thermal influence on the battery cell 20, thereby improving the service performance of the battery 10.
In some implementations, as shown in fig. 7-15, a distance L 3 between the first sidewall 1212 of the first groove 121 proximate to the first through hole 122 and the inner wall 1221 of the first through hole 122 proximate to the first groove 121 is 15% -91% of the length L 2 of the battery cell 20.
It should be understood that, in an embodiment of the present application, the distance L 3 between the first sidewall 1212 of the first through hole 122 adjacent to the first through hole 122 and the inner wall 1221 of the first through hole 122 adjacent to the first groove 121 may refer to a maximum distance, a minimum distance, or an average distance between the first sidewall 1212 of the first through hole 122 and the inner wall 1221 of the first through hole 122 adjacent to the first groove 121.
Illustratively, in an embodiment of the present application, the ratio of the distance L 3 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 to the length L 2 of the battery cell 20 may be set as: 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 a combination of any two of the foregoing values.
In the embodiment of the present application, the distance L 3 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 L 2 of the battery cell 20, so that the risk that the adhesive 112 overflows to the area of the pressure release mechanism 213 of the battery cell 20 can be reduced when the battery 10 is subjected to vibration or impact or the like, thereby reducing the influence on the actuation performance of the pressure release mechanism 213 and improving the service performance of the battery 10.
Specifically, in some implementations, in the case that the distance L 3 between the first side wall 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 set to different values, the results of the glue overflow test of the battery 10 in the area of the pressure release mechanism 213 under the same experimental conditions are shown in table 2.
TABLE 2
Specifically, the length and width of the selected battery 10 are 220mm, 44mm and 100mm, respectively, the energy density is 180Wh/kg of lithium iron phosphate battery, the thickness of the adhesive 112 between the supporting member 12 and the first wall 215 is 0.8mm, the thickness of the isolating member 13 is 1mm, the width is 120mm, a rectangular through hole is arranged in the middle of the supporting member 12, the length and width of the rectangular through hole are 80mm and 80mm, respectively, the length and width of the pressure release mechanism 213 on the first wall 215 of the battery cell 20 is 70mm and 60mm, during the experiment, 3000N pressure is applied to the battery 10 in the thickness direction of the supporting member 12, the pressure is maintained for 12h, and the glue overflow condition of the first groove 121 is detected.
As shown in table 2 above, the first column of data represents the values of the lengths L 2 of the battery cells 20 used in the different examples and comparative examples; the second column data represents the value of the distance L 3 between the sidewall 1212 of the first recess 121 adjacent to the first through hole 122 and the inner wall 1221 of the first through hole 122 adjacent to the first recess 121 in the different embodiments and comparative examples; the third column of data represents the ratio of the distance L 3 between the first side wall 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, and the length L 2 of the battery cell 20; the fourth column shows the results of the glue overflow test of the different embodiments and the comparative examples, wherein the glue overflow means that the adhesive 112 between the support member 12 and the first wall 215 overflows from the first groove 121 on the support member 12, and the overflowed adhesive 112 moves towards the area close to the pressure release mechanism 213; no glue flash means that the adhesive 112 between the support member 12 and the first wall 215 does not spill from the first recess 121 in the support member 12.
As shown in table 2, according to comparative examples 1 to 4 and examples 1 to 6, as the distance L 3 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 increases, when the ratio of the distance L 3 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 to the length L 2 of the battery cell 20 is less than or equal to 0.145, the overflow phenomenon exists at the first groove 121, and the overflowed adhesive 112 moves to the area where the pressure release mechanism 213 is located; when the ratio of the distance L 3 between the first side wall 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 to the length L 2 of the battery cell 20 is greater than or equal to 0.15 and less than or equal to 0.91, no glue overflow phenomenon exists at the first groove 121.
In some implementations, as shown in fig. 7 to 11, on a plane perpendicular to the extending direction of the first groove 121, the shape of the first groove 121 is one of the following shapes: rectangular, square, inverted triangular, trapezoidal or semicircular. Thus, in the embodiment of the present application, on the plane perpendicular to the extending direction of the first groove 121, by setting the shape of the first groove 121 to one of the following shapes: rectangular, square, inverted triangular, trapezoidal, or semicircular to facilitate the processing and manufacturing of the battery 10, while reducing the processing cost of the battery 10.
In some implementations, as shown in fig. 4-11, the battery 10 further includes a spacer member 13, the spacer member 13 being connected between the support member 12 and the first wall 215, the spacer member 13 being configured to prevent the adhesive 112 from being applied to the area where the pressure relief mechanism 213 is located.
It should be appreciated that in embodiments of the present application, the spacer member 13 may be adhesively coupled to the support member 12, and, illustratively, the spacer member 13 may be coupled to the support member 12 by an adhesive 112.
It should also be appreciated that the material of the spacer member 13 in the embodiment of the present application includes at least one of the following materials: polyurethane, polyamide, polypropylene, silicon foam, polycarbonate, polyethylene terephthalate, mica, glass fiber, ceramic fiber, polyethylene epoxy resin.
In the embodiment of the present application, the isolating member 13 is disposed in the battery 10, and the isolating member 13 is connected between the supporting member 12 and the first wall 215, where the isolating member 13 is configured to prevent the adhesive 112 from being applied to the area where the pressure release mechanism 213 is located, so that under the working conditions of vibration or impact on the battery 10, the risk that the adhesive 112 overflows to the area where the pressure release mechanism 213 of the battery cell 20 is located can be effectively reduced, so as to reduce the influence on the actuation performance of the pressure release mechanism 213, thereby improving the service performance of the battery 10.
In some implementations, as shown in fig. 4 to 11, the support member 12 includes a plurality of the first grooves 121, and the projection of the spacer member 13 covers at least one of the plurality of the first grooves 121 on a plane perpendicular to the thickness direction of the support member 12.
It should be understood that, in the embodiment of the present application, the projection of the isolation member 13 or the first groove 121 on the plane perpendicular to the thickness direction of the support member 12 may be an orthographic projection in the thickness direction, or the projection of the isolation member 13 or the first groove 121 on the plane perpendicular to the thickness direction of the support member 12 may be a projection in other directions.
It should also be appreciated that in embodiments of the present application, the projection of the isolation member 13 covering at least one of the plurality of first grooves 121 may refer to the projection of the isolation member 13 covering at least one of the plurality of first grooves 121.
In the embodiment of the present application, the supporting member 12 includes a plurality of the first grooves 121, and by covering the projection of the isolating member 13 on a plane perpendicular to the thickness direction of the supporting member 12 with at least one of the plurality of the first grooves 121, the risk that the adhesive 112 overflows to the area of the pressure release mechanism 213 of the battery cell 20 can be effectively reduced under the working condition that the battery 10 is subjected to vibration or impact, so as to reduce the influence on the actuation performance of the pressure release mechanism 213, thereby improving the service performance of the battery 10.
Fig. 15 shows a schematic cross-sectional view of a battery 10 according to another embodiment of the present application, and fig. 15 may be a schematic cross-sectional view of a corresponding portion of the battery 10 in fig. 4 along a direction perpendicular to a direction Z, for example.
In some implementations, a plurality of the first grooves 121 are disposed around the pressure relief mechanism 213. Illustratively, as shown in fig. 15, a plurality of the first grooves 121 may be provided to be disposed around the pressure release mechanism 213 for accommodating a portion of the adhesive 112 between the first wall 215 and the support member 12, and the shape of the plurality of the first grooves 121 in a plane perpendicular to the height direction of the battery 10 may be a ring shape or a hollow square shape.
In the embodiment of the present application, by disposing the plurality of first grooves 121 around the pressure release mechanism 213, the risk of the adhesive 112 overflowing to the area of the pressure release mechanism 213 of the battery cell 20 can be further reduced under the working conditions such as vibration or impact of the battery 10, so as to reduce the influence on the actuation performance of the pressure release mechanism 213, thereby improving the service performance of the battery 10.
In some implementations, as shown in fig. 5 and 6, the isolation member 13 is provided with a second groove 130 that is open toward the battery cell 20, at least a portion of a second sidewall 131 of the second groove 130 is located within the first through hole 122, and an outer edge 132 of the second groove 130 is connected to the second sidewall 131 and disposed between the support member 12 and the first wall 215.
In the embodiment of the application, by disposing the isolation member 13 to open toward the second groove 130 of 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 disposed between the support member 12 and the first wall 215, in the case where the support member 12 is configured to be attached to the first wall 215 by the adhesive 112, the adhesive 112 can be effectively prevented from being applied between the support member 12 and the pressure release mechanism 213, and the influence on the actuation performance of the pressure release mechanism 213 due to the adhesive 112 entering the area where the pressure release mechanism 213 is located is reduced, thereby improving the service performance of the battery 10.
In some implementations, the second bottom wall 133 of the second recess 130 is provided with a second through hole 123 corresponding to the pressure relief mechanism 213.
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 may be set according to actual requirements, and illustratively, 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.
It should also be appreciated that in the embodiment of the present application, the shape of the second through hole 123 in the direction perpendicular to the thickness direction of the support member 12 may be set according to actual requirements, for example, the shape of the second through hole 123 may be set according to the shape of the pressure release mechanism 213 of the battery cell 20, and exemplary shapes of the second through hole 123 include, but are not limited to, a circle, an ellipse, a rectangle, and a regular polygon.
In the embodiment of the present application, the second through hole 123 corresponding to the pressure release mechanism 213 is provided on the second bottom wall 133 of the second groove 130, so that the exhaust from the battery cell 20 can quickly pass through the isolation member 13, thereby allowing the exhaust to be timely discharged, reducing the influence on the actuation performance of the pressure release mechanism 213 caused by the accumulation of the exhaust in the second groove 130, thereby reducing the thermal influence on the battery cell 20 and improving the service performance of the battery 10.
In some implementations, as shown in fig. 5, the second bottom wall 133 of the second recess 130 is configured to be broken by emissions from the battery cell 20 when the pressure relief mechanism 213 is actuated, such that the emissions pass through the isolation member 13. Thus, in the embodiment of the present application, by providing the second bottom wall 133 of the second recess 130 to be damaged by the discharge discharged from the battery cell 20 when the pressure release mechanism 213 is actuated, and allowing the discharge to pass through the partition member 13, the discharge can be discharged in time, the influence on the actuation performance of the pressure release mechanism 213 due to the accumulation of the discharge in the second recess 130 is reduced, and thus the thermal influence on the battery cell 20 is reduced, and the service performance of the battery 10 is improved.
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 being configured to be breakable by the emissions upon actuation of the pressure relief mechanism 213 to allow the emissions to pass through the isolation member 13.
It should be appreciated that in embodiments of the present application, at least a portion of the second bottom wall 133 of the second recess 130 may be provided as a weakened area 134 to be breakable by the emissions upon actuation of the pressure relief mechanism 213 to allow the emissions to pass through the weakened area 134.
It should also be appreciated that in the embodiment of the present application, the shape of the weak area 134 may be set according to actual requirements in the thickness direction of the second bottom wall 133 perpendicular to the second groove 130, for example, the shape of the weak area 134 may be set according to the shape of the pressure release mechanism 213 of the battery cell 20, and illustratively, the shape of the weak area 134 includes, but is not limited to, a circle, an ellipse, a rectangle, and a regular polygon.
It should also be appreciated that the number of weakened areas 134 provided on the second bottom wall 133 of the second recess 130 may be provided according to practical requirements, for example, the number of weakened areas 134 may be one or more.
In the embodiment of the present application, the second bottom wall 133 of the second groove 130 is provided with the weak area 134, and the weak area 134 is configured to be damaged by the exhaust when the pressure release mechanism 213 is actuated, that is, when the internal pressure or temperature of the battery cell 20 reaches the threshold value, the exhaust can quickly pass through the isolation component 13 in time, so as to realize quick pressure release of the battery cell 20, effectively reduce the influence on the actuation performance of the pressure release mechanism 213 caused by the accumulation of the exhaust in the second groove 130, and thus improve the service performance of the battery 10.
In some implementations, the weakened area 134 satisfies at least one of: the melting point of the material of the weakened area 134 is less than the melting point of the material of the rest of the spacer member 13; the weakened area 134 has a thickness less than the thickness of the remainder of the isolation member 13; the surface of the weakened area 134 perpendicular to the thickness direction of the separation member 13 is provided with a score.
It should be appreciated that in embodiments of the present application, the melting point of the material at the weakened area 134 may be set to be less than or equal to a preset threshold value so that upon actuation of the pressure relief mechanism 213, the weakened area 134 is more readily melted by emissions vented through the pressure relief mechanism 213 than the remainder of the isolation member 13. Second, the thickness of the weakened area 134 can also be set smaller than the thickness of the remainder of the isolation member 13, since the weakened area 134 is thinner than the remainder of the isolation member 13, the weakened area 134 is more easily damaged by the discharge discharged through the pressure relief mechanism 213 than the remainder of the isolation member 13 when the pressure relief mechanism 213 is actuated.
It should also be appreciated that in embodiments of the present application, the shape of the score of the weakened area 134 disposed perpendicular to the surface of the bottom wall 133 of the second groove 130 in the thickness direction may be configured according to actual needs, and the score may include, for example, but not limited to, a cross score, mi Zi score, i-score.
In an embodiment of the present application, the weakened area 134 is provided by at least one of: the melting point of the material of the weakened area 134 is less than the melting point of the material of the rest of the spacer member 13; the weakened area 134 has a thickness less than the thickness of the remainder of the isolation member 13; the surface of the weakened area 134 perpendicular to the thickness direction of the isolation member 13 is provided with a score, so that the weakened area 134 is more easily damaged by the discharge of the battery cell 20 than the rest of the isolation member 13, and when the internal pressure or temperature of the battery cell 20 reaches a threshold value, the discharge can quickly pass through the weakened area 134 in time, so as to realize quick pressure release of the battery cell 20, reduce the influence on the actuation performance of the pressure release mechanism 213 caused by the accumulation of the discharge on the side of the isolation member 13 close to the pressure release mechanism 213 of the battery cell 20, and improve the service performance of the battery 10.
Referring again to fig. 4-14 described above, there is provided a battery 10 comprising: the battery cell 20, the support member 12 and the isolation member 13, the first wall 215 of the battery cell 20 is provided with a pressure release mechanism 213, the support member 12 is used for supporting the battery cell 20, the support member 12 is attached to the first wall 215 through an adhesive 112, the support member 12 is provided with a first through hole 122 corresponding to the pressure release mechanism 213, the isolation member 13 is connected between the support member 12 and the first wall, the isolation member 13 is configured to prevent the adhesive 112 from being applied to the area where the pressure release mechanism 213 is located, wherein the surface, close to the battery cell 20, of the support member 12 is provided with a first groove 121 opening towards the battery cell 20, and the first groove 121 is used for containing part of the adhesive 112. 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. The dimension L 1 of the first groove 121 along the extending direction of the first groove 121 is greater than or equal to the width W 2 of the battery cell 20. The distance D 1 between the first bottom wall 1211 of the first recess 121 and the surface of the support member 12 adjacent to the battery cell 20 is 20% -90% of the thickness D 2 of the support member 12. The ratio between the dimension W 1 of the first groove 121 in the extending direction perpendicular to the first groove 121 and the tackiness P of the adhesive 112 is greater than or equal to 0.005. The distance L 3 between the first side wall 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% -91% of the length L 2 of the battery cell 20. The support member 12 includes a plurality of the first grooves 121, and the projection of the spacer member 13 covers at least one of the plurality of the first grooves 121 on a plane perpendicular to the thickness direction of the support member 12.
The embodiment of the application also provides electric equipment, which comprises the battery 10 in any embodiment, wherein the battery 10 is used for providing electric energy for the electric equipment. Specifically, the electric device may be the vehicle 1 shown in fig. 1, or any electric device using the battery 10.
The embodiment of the application also provides an energy storage device, which comprises the battery 10 in any of the above embodiments, wherein the battery 10 is used for storing electric energy for the energy storage device.
While the application has been described with reference to the above embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the embodiments of the application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (19)
1. A battery, comprising:
a battery cell (20), a first wall (215) of the battery cell (20) being provided with a pressure relief mechanism (213);
-a support member (12) for supporting the battery cells (20), the support member (12) being attached to the first wall (215) by means of an adhesive (112);
Wherein, the surface of the support part (12) close to the battery cell (20) is provided with a first groove (121) which is opened towards the battery cell (20), and the first groove (121) is used for containing part of the adhesive (112).
2. The battery according to claim 1, wherein the first groove (121) extends in a length direction of the battery cell (20) or the first groove (121) extends in a width direction of the battery cell (20).
3. The battery according to claim 1, wherein a dimension L 1 of the first groove (121) in an extending direction of the first groove (121) is greater than or equal to a width W 2 of the battery cell (20).
4. The battery according to claim 1, characterized in that the distance D 1 between the first bottom wall (1211) of the first recess (121) and the surface of the support member (12) adjacent to the battery cell (20) is 20% -90% of the thickness D 2 of the support member (12).
5. The battery according to claim 1, wherein a ratio between a dimension W 1 of the first groove (121) in an extending direction perpendicular to the first groove (121) and an adhesiveness P of the adhesive (112) is greater than or equal to 0.001.
6. The battery according to claim 5, wherein a ratio between a dimension W 1 of the first groove (121) in an extending direction perpendicular to the first groove (121) and an adhesiveness P of the adhesive (112) is greater than or equal to 0.005.
7. The battery according to claim 1, characterized in that the support member (12) is provided with a first through hole (122) corresponding to the pressure release mechanism (213).
8. The battery according to claim 7, wherein a distance L 3 between a first side wall (1212) of the first groove (121) adjacent to the first through hole (122) and an inner wall (1221) of the first through hole (122) adjacent to the first groove (121) is 15% -91% of a length L 2 of the battery cell (20).
9. The battery according to claim 1, characterized in that, on a plane perpendicular to the extending direction of the first groove (121), the shape of the first groove (121) is one of the following shapes: rectangular, square, inverted triangular, trapezoidal or semicircular.
10. The battery of claim 8, wherein the battery further comprises: -a spacer member (13), the spacer member (13) being connected between the support member (12) and the first wall (215), the spacer member (13) being configured to prevent the adhesive (112) from being applied at the area where the pressure relief mechanism (213) is located.
11. The battery according to claim 10, wherein the support member (12) includes a plurality of the first grooves (121), and a projection of the spacer member (13) covers at least one of the plurality of the first grooves (121) on a plane perpendicular to a thickness direction of the support member (12).
12. The battery according to claim 11, characterized in that a plurality of the first grooves (121) are provided around the pressure relief mechanism (213).
13. The battery according to claim 10, characterized in that the separator member (13) is provided with a second recess (130) opening towards the battery cell (20), at least part of a second side wall (131) of the second recess (130) being located in the first through hole (122), an outer edge (132) of the second recess (130) being connected to the second side wall (131) and being arranged between the support member (12) and the first wall (215).
14. The battery according to claim 13, characterized in that the second bottom wall (133) of the second recess (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 recess (130) is configured to be breakable by emissions from the battery cell (20) upon actuation of the pressure relief mechanism (213) to pass the emissions through the isolation member (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 zone of weakness (134), which zone of weakness (134) is configured to be breakable by the discharge upon actuation of the pressure relief mechanism (213) to pass the discharge through the partition member (13).
17. The battery according to claim 16, wherein the weakened area (134) satisfies at least one of:
-the melting point of the material of the weakened zone (134) is lower than the melting point of the material of the rest of the insulating part (13);
The weakened zone (134) has a thickness less than the thickness of the remainder of the spacer member (13);
The surface of the weakened area (134) perpendicular to the thickness direction of the separation member (13) is provided with a score.
18. A powered device, comprising: the battery of any of claims 1-17, the battery to provide electrical energy to the powered device.
19. An energy storage device, comprising: a battery as claimed in any one of claims 1 to 17, for storing electrical energy for the energy storage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420332539.6U CN220934324U (en) | 2024-02-22 | 2024-02-22 | Battery, electric equipment and energy storage equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420332539.6U CN220934324U (en) | 2024-02-22 | 2024-02-22 | Battery, electric equipment and energy storage equipment |
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| Publication Number | Publication Date |
|---|---|
| CN220934324U true CN220934324U (en) | 2024-05-10 |
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| CN202420332539.6U Active CN220934324U (en) | 2024-02-22 | 2024-02-22 | Battery, electric equipment and energy storage equipment |
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| CN (1) | CN220934324U (en) |
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