Batteries and power consumers

Abstract

An embodiment of the present application provides a battery and a power consuming device. The battery includes a housing including an electric cavity, a battery cell accommodated in the electric cavity, the battery cell having a pressure relief mechanism installed on a first wall of the battery cell, and an attachment structure attached to the first wall, the attachment structure having a relief area, the relief area being used to provide a deformation space for the pressure relief mechanism of at least one of the battery cells, and the relief area satisfies 0.3≦S2 / (n*S1)≦8.5, where S1 is the projection area of ​​the pressure relief mechanism in a direction perpendicular to the first wall, S2 is the projection area of ​​the relief area in a direction perpendicular to the first wall, n is the number of pressure relief mechanisms corresponding to the relief areas, and n is a positive integer. The battery and the power consuming device of the embodiment of the present application can improve the safety performance of the battery.

Description

[Technical field]

[0001] This application relates to the field of battery technology, and more particularly to batteries and power consuming devices. [Background technology]

[0002] With the continuous progress of battery technology, various new energy industries using batteries as energy storage devices are developing rapidly. In addition to the improvement of battery performance in the development of battery technology, safety issues are also one of the issues that cannot be ignored. If the safety issues of a battery cannot be ensured, the battery cannot be used. Therefore, how to improve the safety of a battery is one of the technical issues that must be solved as soon as possible in battery technology. Summary of the Invention

[0003] The embodiments of the present application provide a battery and a power consuming device that can improve the safety performance of the battery.

[0004] According to a first aspect, a battery is provided, comprising a housing including an electric cavity, a battery cell accommodated in the electric cavity, the battery cell having a pressure relief mechanism installed on a first wall of the battery cell, and an attachment structure attached to the first wall, a relief area is provided in the attachment structure, the relief area is used to provide a deformation space for the pressure relief mechanism of at least one of the battery cells, and the relief area satisfies 0.3≦S2 / (n*S1)≦8.5, where S1 is a projection area of ​​the pressure relief mechanism in a direction perpendicular to the first wall, S2 is a projection area of ​​the relief area in a direction perpendicular to the first wall, n is the number of pressure relief mechanisms corresponding to the relief areas, and n is a positive integer.

[0005] Therefore, the battery of the embodiment of the present application can improve the safety of the battery by reasonably setting the size of the area of ​​the relief area of ​​the attachment structure. Specifically, if S2 / (n*S1) is set too small, there may be a situation where the area of ​​the pressure relief mechanism is relatively large, but the area of ​​the relief area corresponding to the pressure relief mechanism is relatively small. Thus, on the one hand, the relief area may not be able to provide sufficient deformation space for the pressure relief mechanism, so that at least a part of the pressure relief mechanism is blocked by the relief area and cannot operate normally, and furthermore, the waste material inside the battery cell cannot be discharged in a timely manner. On the other hand, when the pressure relief mechanism can operate normally, the area of ​​the relief area is relatively small, so that the waste material cannot pass through the relief area quickly and be discharged. That is, there is a discharge bottleneck in the relief area, and similarly, the waste material inside the battery cell cannot be discharged in a timely manner. Therefore, both of these two situations may cause thermal diffusion after the thermal runaway of the battery cell, which may further cause the explosion of the battery, affecting the safety of the battery.

[0006] Conversely, if S2 / (n*S1) is set too large, there may be a situation where the area of ​​the pressure relief mechanism is too small or the area of ​​the relief area corresponding to the pressure relief mechanism is too large. If the area of ​​the pressure relief mechanism is too small, the waste inside the battery cell will not be discharged from the battery cell in a timely and prompt manner, which may cause thermal diffusion after the battery cell goes into thermal runaway, and may even cause the battery to explode, affecting the safety of the battery. If the area of ​​the relief area is too large, it may reduce the rigidity and strength of the attachment structure in which the relief area is located, affecting the performance of the attachment structure, for example, affecting the supporting effect of the attachment structure on the battery cell.

[0007] In some embodiments, the relief area satisfies 0.8≦S2 / (n*S1)≦4, thereby making it possible to rationally set the area of ​​the pressure relief mechanism and facilitate the timely discharge of exhaust from the battery cell through the pressure relief mechanism; the area of ​​the relief area is not too small, thereby avoiding affecting the normal operation of the pressure relief mechanism and the discharge of exhaust, and the area of ​​the relief area is not too large, which can ensure the strength and rigidity of the attachment structure in which the relief area is located, and further improve the safety and stability of the battery.

[0008] In some embodiments, the range of values ​​of the projected area S1 of the pressure relief mechanism in a direction perpendicular to the first wall is [50 mm 2 ,3000mm 2 If the area S1 is set too large, the area of ​​the pressure relief mechanism located on the first wall is too large, which reduces the strength of the first wall, i.e., reduces the strength of the battery cell housing, and further affects the structural strength and stability of the battery cell. Conversely, if the area S1 is set too small, the area of ​​the pressure relief mechanism is too small, and when the battery cell experiences thermal runaway, the exhaust must be discharged through the pressure relief mechanism. Therefore, if the area of ​​the pressure relief mechanism is too small, the exhaust of the battery cell cannot be discharged in a timely manner, which may cause thermal diffusion between the battery cells and even cause the battery to explode.

[0009] In some embodiments, the projection area S2 of the relief region in a direction perpendicular to the first wall is 50 mm 2 ≦S2 / n≦10000mm 2If the value of S2 / n is set too large, the area of ​​the region of the relief region corresponding to one pressure relief mechanism will be too large, which will increase the total area of ​​the relief region on the attachment structure, and further affect the strength of the attachment structure, for example, affecting the supporting function of the attachment structure for the battery cells, and further affecting the structural strength and stability of the battery. Conversely, if the value of S2 / n is set too small, the area of ​​the region of the relief region corresponding to one pressure relief mechanism will be too small, which may block at least a part of the pressure relief mechanism, further affecting the normal operation of the pressure relief mechanism, and failing to provide the pressure relief mechanism with sufficient deformation space, which will affect the discharge of waste from the battery cells and easily cause thermal diffusion between the battery cells, and further causing the battery to explode.

[0010] In some embodiments, the relief area corresponds to a plurality of the pressure relief mechanisms, and each relief area corresponds to a plurality of the pressure relief mechanisms, thereby reducing the number of relief areas and facilitating processing, and eliminating the need for a one-to-one correspondence between the pressure relief mechanisms and the relief areas during assembly, thereby reducing the difficulty of assembly.

[0011] In some embodiments, the electrical cavity includes a second wall, and the first wall faces the second wall, and the pressure relief mechanism of the battery cell faces the second wall of the electrical cavity and does not face other battery cells, which makes it easy to install a relief structure on the wall of the electrical cavity and is used to provide a relief space for the pressure relief mechanism to deform, which can improve the space utilization rate of the battery and can also reduce the risk that a battery cell that has experienced thermal runaway will cause thermal runaway in other battery cells, thereby improving the safety of the battery.

[0012] In some embodiments, the attachment structure includes the second wall, and the area of ​​the relief region of the second wall can be reasonably set to allow the discharged material to be discharged in a timely and rapid manner, to avoid the occurrence of thermal diffusion and explosion, and to improve the safety of the battery.

[0013] In some embodiments, the relief area includes a through hole penetrating the second wall, the through hole being in the thickness direction of the second wall, and the through hole is used for discharging the waste discharged from the pressure relief mechanism from the electrical cavity through the through hole when the pressure relief mechanism is activated. The relief area includes a through hole provided in the second wall, which is easy to process on the one hand, and the through hole provides a deformation space for the pressure relief mechanism, and at the same time, allows the waste discharged from the pressure relief mechanism to be quickly discharged through the through hole.

[0014] In some embodiments, the second wall is provided with a seal structure for sealing the through hole, the seal structure being broken when the pressure relief mechanism is activated to allow the exhaust to pass through the through hole.

[0015] When the relief area includes a through hole, it is considered to expose the pressure relief mechanism, so that during the use of the battery, the pressure relief mechanism is easily affected by the external environment, which may even cause the pressure relief mechanism to fail. Therefore, the sealing structure installed can, on the one hand, maintain the sealing property of the electrical cavity during the normal use of the battery cell, and protect the pressure relief mechanism from being affected by the external environment, and on the other hand, when the battery cell experiences thermal runaway, the sealing structure can be broken in a timely manner to expose the through hole, and the waste of the battery cell can be discharged from the electrical cavity through the through hole, thereby avoiding thermal runaway and improving the safety of the battery.

[0016] In some embodiments, the seal structure is installed on a surface of the second wall facing the first wall, and / or the seal structure is installed on a surface of the second wall away from the first wall. When the seal structure is installed on a surface of the second wall away from the first wall, the distance between the pressure relief mechanism and the seal structure can provide a deformation space for the operation of the pressure relief mechanism and avoid affecting the pressure relief mechanism. When the seal structure is installed on a surface of the second wall facing the first wall, the seal structure is close to the pressure relief mechanism and can be quickly destroyed by the discharge of the pressure relief mechanism, for example, can quickly respond to the temperature of the battery cell, quickly melt the seal structure, avoid affecting the operation of the pressure relief mechanism, and can timely discharge the discharge.

[0017] In some embodiments, the relief area includes a groove having an opening in the second wall facing the pressure relief mechanism, the groove being broken when the pressure relief mechanism is activated so that effluent discharged from the pressure relief mechanism can pass through the second wall and be discharged from the electrical cavity. The opening of the groove faces the pressure relief mechanism, and the interior of the groove can provide a deformation space for the pressure relief mechanism, thereby facilitating the pressure relief mechanism to operate and discharge effluent.

[0018] In some embodiments, the battery further includes a connection structure disposed between the first wall and the second wall, and the attachment structure includes the connection structure. The connection structure is disposed between the first wall and the second wall, and on the one hand, when the battery cell does not experience thermal runaway, the connection structure can realize the relative fixation between the first wall and the second wall and the sealing between the first wall and the second wall, and on the other hand, the attachment structure may include the connection structure, that is, the connection structure includes a relief area, and can avoid blocking the pressure relief mechanism of the connection structure, thereby allowing the discharged material to be discharged smoothly.

[0019] In some embodiments, the connecting structure is provided with a relief opening corresponding to the pressure relief mechanism, and the relief area includes the relief opening, which can provide a deformation space when the pressure relief mechanism is activated, so that the connecting structure can avoid blocking the pressure relief mechanism and causing the pressure relief mechanism to operate untimely, and can allow the discharged matter passing through the pressure relief mechanism to be quickly discharged through the relief opening.

[0020] In some embodiments, the connection structure is used to prevent the effluent discharged from the pressure relief mechanism from entering the electrical cavity when the pressure relief mechanism is activated. The connection structure may be a sealant, and in particular, when the pressure relief mechanism is activated, the connection structure is located between the first wall and the second wall, and can prevent the effluent from entering the electrical cavity through the connection structure. In this way, the effluent that has passed through the pressure relief mechanism can be directly discharged from the electrical cavity through the escape opening of the connection structure and the second wall, respectively, to avoid the battery cells in the electrical cavity from short-circuiting after the effluent enters the electrical cavity, causing thermal diffusion and even explosion, and the effluent can be collected in a centralized manner, making it easier to treat the effluent in a centralized manner, avoiding the effluent from affecting other components in the battery, and improving the safety of the battery.

[0021] In some embodiments, the connection structure is used to discharge the effluent discharged from the pressure relief mechanism into the electrical cavity when the pressure relief mechanism is activated, which reduces the requirement for sealing of the connection structure and is easy to implement, and allows some of the effluent to be discharged into the electrical cavity through the connection structure, while allowing some of the effluent to be discharged from the electrical cavity through the connection structure and the second wall, thereby not only accelerating the discharge speed and reducing the risk of battery explosion, but also realizing directional and dispersed discharge, avoiding the effluent from affecting other components, and improving the safety and stability of the battery.

[0022] In some embodiments, the connection structure is provided with a flow path for discharging the effluent discharged from the pressure relief mechanism to the electrical cavity when the pressure relief mechanism is activated. The effluent discharged through the pressure relief mechanism can be discharged into the electrical cavity through the flow path, and the position of the flow path can be rationally set to realize directional discharge of the effluent, reduce the impact of the effluent on individual components in the electrical cavity, and further improve the safety of the battery.

[0023] In some embodiments, the connection structure is used to break when the pressure relief mechanism is activated to form a gap between the first wall and the second wall, and the gap is used to discharge the waste discharged from the pressure relief mechanism to the electrical cavity. By rationally selecting the material of the connection structure, a suitable melting point of the connection structure can be obtained, so that the connection structure is broken when the pressure relief mechanism is activated to form a further gap, thereby discharging the waste to the electrical cavity, thus eliminating the need to install an additional structure in the connection structure, which is more convenient and can also ensure the sealing property of the battery cell during normal use.

[0024] In some embodiments, the battery further includes a collection cavity for collecting effluent from the battery cells when the pressure relief mechanism is activated. The collection cavity can centrally collect and / or process the effluent and further vent the effluent outside the battery. For example, the collection cavity can include a liquid, such as a cooling medium, or a member for containing the liquid can be provided to further reduce the temperature of the effluent entering the collection cavity.

[0025] In some embodiments, the battery further includes an isolation member for isolating the electrical cavity and the collection cavity, the isolation member being used to isolate the electrical cavity and the collection cavity, i.e., the electrical cavity housing the battery cells and busbar members and the collection cavity collecting waste are separated to avoid mutual influence therebetween.

[0026] In some embodiments, the isolation member is formed as at least a portion of the second wall. In this manner, effluent through the pressure relief mechanism may be evacuated from the electrical cavity through the isolation member, or may be evacuated directly to a collection cavity, for example.

[0027] According to a second aspect, there is provided a power consumer device, the power consumer device including a battery as described in the first aspect, the battery being for providing electrical energy for the power consumer device.

[0028] In some embodiments, the power consumer is a vehicle, a watercraft, or a spacecraft. [Brief description of the drawings]

[0029] [Figure 1] 1 is a structural schematic diagram of a vehicle disclosed in an embodiment of the present application. [Diagram 2] FIG. 1 is a structural schematic diagram of a battery disclosed in one embodiment of the present application. [Diagram 3] FIG. 1 is a schematic exploded view of a battery disclosed in an embodiment of the present application. [Figure 4] FIG. 1 is a schematic diagram of a local structure of a battery disclosed in an embodiment of the present application. [Diagram 5] FIG. 2 is a schematic diagram of a local structure of another battery disclosed in an embodiment of the present application. [Figure 6] FIG. 2 is a schematic diagram of a local structure of another battery disclosed in an embodiment of the present application. [Figure 7] FIG. 2 is a structural schematic diagram of another battery disclosed in an embodiment of the present application. [Figure 8] FIG. 2 is a structural schematic diagram of another battery disclosed in an embodiment of the present application. [Figure 9] FIG. 2 is an exploded structural schematic diagram of another battery disclosed in an embodiment of the present application. [Figure 10] FIG. 2 is a schematic diagram of a local structure of another battery disclosed in an embodiment of the present application.

[0030] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] The following describes the embodiments of the present application in more detail in conjunction with the drawings and examples. The detailed description of the embodiments and the drawings are for illustrative purposes only to explain the principles of the present application, but are not intended to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0032] In the description of this application, it should be explained that, unless otherwise specified, the meaning of "plurality" is two or more, and the orientation or positional relationship indicated by the terms "up", "down", "left", "right", "inside", "outside", etc., is merely for convenience and simplification of the description of this application, and does not indicate or imply that the device or element referred to has a particular orientation and must be configured and operated in a particular orientation, and should not be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only, and should not be understood as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but is within a margin of error. "Parallel" is not parallel in the strict sense, but is within a margin of error.

[0033] The directions appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the present application. In the description of the present application, it should be further explained that unless otherwise clearly specified or limited, the terms "attached", "connected" and "connected" should be understood in a broad sense, for example, may be fixedly connected, detachably connected, or integrally connected, may be directly connected, or may be indirectly connected through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific situation.

[0034] In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components in different embodiments are omitted for the sake of brevity. It should be understood that the dimensions of thickness, aspect, etc. of various components in the embodiments of the present application shown in the drawings, and the dimensions of thickness, aspect, etc. of the entire integrated device are only illustrative descriptions, and do not constitute any limitations on the present application.

[0035] In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., but the embodiment of the present application is not limited thereto. The battery cell may have a cylindrical shape, a flat shape, a rectangular shape, or other shapes, but the embodiment of the present application is not limited thereto. Battery cells are generally divided into three types according to the packaging method, namely, a cylindrical battery cell, a rectangular battery cell, and a pouch battery cell, but the embodiment of the present application is not limited thereto.

[0036] The battery referred to in the embodiments of the present application is a single physical module that includes one or more battery cells and provides higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack. The battery generally includes a housing for packaging one or more battery cells. The housing can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0037] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode plate, a negative electrode plate, and a separator. The battery cell is mainly operated by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode collector and a positive electrode active material layer, and the positive electrode active material layer is applied to the surface of the positive electrode collector, and the collector on which the positive electrode active material layer is not applied protrudes from the collector on which the positive electrode active material layer is applied, and the collector on which the positive electrode active material layer is not applied is called a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode plate includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is applied to the surface of the negative electrode collector, the collector on which the negative electrode active material layer is not applied protrudes from the collector on which the negative electrode active material layer is applied, and the collector on which the negative electrode active material layer is not applied is a negative electrode tab. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon or silicon, etc. The number of positive electrode tabs is stacked in a plurality, and the number of negative electrode tabs is stacked in a plurality, so that melting does not occur even when a large current is passed through them. The material of the separator may be polypropylene (PP) or polyethylene (PE), etc. The electrode assembly may have a wound structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0038] The development of battery technology requires consideration of a wide range of design factors, such as performance parameters such as energy density, cycle life, discharge capacity, charge / discharge ratio, etc., at the same time, and also requires consideration of battery safety. For batteries, the main security hazard comes from the charging and discharging process. In order to improve the safety performance of batteries, a pressure relief mechanism is generally installed in a battery cell. The pressure relief mechanism is an element or member that operates to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. The predetermined threshold may be adjusted according to different design needs. For example, the predetermined threshold may depend on one or more materials of the positive electrode plate, the negative electrode plate, the electrolyte, and the separator in the battery cell. The pressure relief mechanism may adopt an element or member that is sensitive to pressure or temperature, etc., that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism operates to form a passage for releasing the internal pressure or temperature.

[0039] A pressure relief mechanism requires a certain deformation space when it operates. This deformation space is the space in the operating direction (i.e., the direction of destruction) inside or outside the pressure relief mechanism when the pressure relief mechanism operates (e.g., when at least a part of the pressure relief mechanism is destroyed). Therefore, how to set up this deformation space is particularly important for this pressure relief mechanism.

[0040] An embodiment of the present application provides a battery and a power consumption device, the battery including a housing, a battery cell, and an attachment structure, where the battery cell is accommodated in an electrical cavity of the housing, a pressure relief mechanism is installed on a first wall of the battery cell, and the attachment structure is attached to the first wall. A relief area is provided in the attachment structure, and the relief area can provide a deformation space for the pressure relief mechanism of at least one battery cell, and the relief area satisfies 0.3≦S2 / (n*S1)≦8.5, where S1 is the projection area of ​​the pressure relief mechanism in a direction perpendicular to the first wall, S2 is the projection area of ​​the relief area in a direction perpendicular to the first wall, n is the number of pressure relief mechanisms corresponding to the relief area, and n is a positive integer. The safety of the battery can be improved by rationally setting the size of the area of ​​the relief area.

[0041] If S2 / (n*S1) is set too small, there may be a situation where the area of ​​the pressure relief mechanism is relatively large, but the area of ​​the relief area corresponding to the pressure relief mechanism is relatively small. Thus, on the one hand, the relief area may not be able to provide sufficient deformation space for the pressure relief mechanism, so that at least a part of the pressure relief mechanism is blocked by the relief area and cannot operate normally, and furthermore, the waste material inside the battery cell cannot be discharged in a timely manner. On the other hand, when the pressure relief mechanism can operate normally, the area of ​​the relief area may be relatively small, so that the waste material cannot pass through the relief area quickly and be discharged. That is, there is a discharge bottleneck in the relief area, and similarly, the waste material inside the battery cell cannot be discharged in a timely manner. Therefore, both of these two situations may cause thermal diffusion after the battery cell goes into thermal runaway, which may further cause the battery to explode, affecting the safety of the battery.

[0042] Conversely, if S2 / (n*S1) is set too large, there may be a situation where the area of ​​the pressure relief mechanism is too small or the area of ​​the relief area corresponding to the pressure relief mechanism is too large. If the area of ​​the pressure relief mechanism is too small, the waste inside the battery cell will not be discharged from the battery cell in a timely and prompt manner, which may cause thermal diffusion after the battery cell goes into thermal runaway, and may even cause the battery to explode, affecting the safety of the battery. If the area of ​​the relief area is too large, it may reduce the rigidity and strength of the attachment structure in which the relief area is located, affecting the performance of the attachment structure, for example, affecting the supporting effect of the attachment structure on the battery cell.

[0043] The technical solutions described in the embodiments of the present application can be applied to various power-consuming devices that use batteries.

[0044] The power consumption devices may be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and power tools, etc. The vehicles may be fuel-powered vehicles, gas-powered vehicles or new energy vehicles, the new energy vehicles may be pure electric vehicles, hybrid vehicles or range extender vehicles, etc., the spacecraft include airplanes, rockets, space shuttles and spaceships, etc., the electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, etc., and the electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric drivers, electric hammers, electric impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not particularly limit the above power consumption devices.

[0045] In the following embodiment, for convenience of explanation, the power consuming device will be described as a vehicle.

[0046] For example, FIG. 1 is a structural schematic diagram of a vehicle 1 in one embodiment of the present application, where the vehicle 1 may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle, etc. A motor 40, a controller 30, and a battery 10 may be installed inside the vehicle 1, and the controller 30 is for controlling the battery 10 to supply power to the motor 40. For example, the battery 10 may be installed at the bottom, front, or rear of the vehicle 1. The battery 10 can be used to supply power to the vehicle 1, for example, the battery 10 can be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the starting, navigation, and operating power consumption demand during operation of the vehicle 1. In another embodiment of the present application, the battery 10 can be used not only as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, to provide driving power to the vehicle 1 instead of gasoline or natural gas, or instead of a part thereof.

[0047] In order to meet different power usage demands, a battery may include multiple battery cells, where the multiple battery cells may be connected in series, parallel, or series-parallel, and the series-parallel connection is a mixture of the series and parallel connections. The battery may be called a battery pack. For example, multiple battery cells may be first connected in series, parallel, or series-parallel to form a battery module, and multiple battery modules may be further connected in series, parallel, or series-parallel to form a battery. That is, multiple battery cells may directly form a battery, or a battery module may be first formed, and then the battery module may form a battery.

[0048] FIG. 2 shows a structural schematic diagram of the battery 10 of the embodiment of the present application. FIG. 3 shows an exploded structural schematic diagram of the battery 10 of the embodiment of the present application. For example, the battery 10 shown in FIG. 3 may be the battery 10 shown in FIG. 2. As shown in FIG. 2 and FIG. 3, the battery 10 of the embodiment of the present application includes a housing 11 including an electric cavity 11a, a battery cell 20 accommodated in the electric cavity 11a, a pressure relief mechanism 211 is installed on a first wall 21 of the battery cell 20, and an attachment structure 13 attached to the first wall 21, a relief area 131 is provided in the attachment structure 13, and the relief area 131 is used to provide a deformation space for the pressure relief mechanism 211 of at least one battery cell 20, and the relief area 131 satisfies 0.3≦S2 / (n*S1)≦8.5. Here, S1 is the projected area of ​​the pressure relief mechanism 211 in a direction perpendicular to the first wall 21, S2 is the projected area of ​​the relief area 131 in a direction perpendicular to the first wall 21, n is the number of pressure relief mechanisms 211 corresponding to the relief area 131, and n is a positive integer.

[0049] It should be understood that, as shown in Figures 2 and 3, the electrical cavity 11a of the housing 11 in the embodiment of the present application is used to accommodate at least one battery cell 20, i.e., the electrical cavity 11a provides an installation space for the battery cell 20. The electrical cavity 11a may be sealed or unsealed. The shape of the electrical cavity 11a may be determined according to the one or more battery cells 20 to be accommodated. For example, Figures 2 and 3 show that the electrical cavity 11a is a rectangular parallelepiped, but the embodiment of the present application is not limited thereto.

[0050] It should be understood that the pressure relief mechanism 211 in the embodiment of the present application is used to operate and release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. The value of the threshold may vary according to design needs. The threshold may depend on one or more materials of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell 20.

[0051] "Operation" referred to in this application refers to the pressure relief mechanism 211 operating or being activated to a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. Possible operations of the pressure relief mechanism 211 may include, but are not limited to, at least a portion of the pressure relief mechanism 211 bursting, crushing, tearing or opening, etc. When the pressure relief mechanism 211 operates, the high temperature and high pressure material inside the battery cell 20 is discharged out of the activated portion as discharge. In this manner, pressure relief and temperature relief can be generated in the battery cell 20 under a controllable pressure or temperature, thereby avoiding the occurrence of a potential more serious accident.

[0052] The emissions from the battery cells 20 referred to in this application include, but are not limited to, electrolyte, melted or split positive and negative plates, separator fragments, high temperature and pressure gases generated by reactions, flames, etc.

[0053] The pressure relief mechanism 211 in the embodiment of the present application is installed on the first wall 21 of the battery cell 20, and the pressure relief mechanism 211 may be a part of the first wall 21, or may be a structure separate from the first wall 21, or may be fixed to the first wall 21 by, for example, welding. For example, when the pressure relief mechanism 211 is a part of the first wall 21, the pressure relief mechanism 211 may be formed by making a cut on the first wall 21, and the thickness of the first wall 21 corresponding to the cut is smaller than the thickness of the area of ​​the pressure relief mechanism 211 other than the cut. The cut is the weakest point of the pressure relief mechanism 211. When too much gas is generated by the battery cell 20, causing the internal pressure to rise and reach a threshold value, or when heat is generated by a reaction inside the battery cell 20, causing the temperature inside the battery cell 20 to rise and reach a threshold value, the pressure relief mechanism 211 will burst at the cut location, causing communication between the inside and outside of the battery cell 20, and the gas pressure and temperature will be released to the outside by the pressure relief mechanism 211 being broken, thereby further preventing the battery cell 20 from exploding.

[0054] Further, for example, the pressure relief mechanism 211 may be a structure separate from the first wall 21, and the pressure relief mechanism 211 may adopt a form such as an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and may specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell 20 reaches a certain threshold, the pressure relief mechanism 211 performs an operation, or a fragile structure provided in the pressure relief mechanism 211 is destroyed, thereby forming an opening or passage for releasing the internal pressure or temperature.

[0055] It should be understood that the attachment structure 13 of the embodiment of the present application being attached to the first wall 21 may include that the attachment structure 13 is in direct contact with the first wall 21, or that the attachment structure 13 is indirectly fixed to the first wall 21. For example, the attachment structure 13 may refer to a structure that is in direct contact with the first wall 21 and fixed to the first wall 21. For further example, the attachment structure 13 may be indirectly fixed to the first wall 21 by other structures, such as an adhesive or a connecting structure, and the embodiment of the present application is not limited thereto.

[0056] In the embodiment of the present application, a relief area 131 is provided in the attachment structure 13, and this relief area 131 satisfies 0.3≦S2 / (n*S1)≦8.5. By rationally setting the area size of this relief area 131, the safety of the battery is improved.

[0057] Specifically, when S2 / (n*S1) is set too small, for example, smaller than 0.3, there may be a situation where the area of ​​the pressure release mechanism 211 is relatively large, but the area of ​​the relief area 131 corresponding to the pressure release mechanism 211 is relatively small. Thus, on the one hand, the relief area 131 may not be able to provide the pressure release mechanism 211 with sufficient deformation space, which may cause at least a part of the pressure release mechanism 211 to be shielded by the relief area 131 and not to operate normally, and furthermore, the waste material inside the battery cell 20 may not be discharged in a timely manner. On the other hand, when the pressure release mechanism 211 can operate normally, the area of ​​the relief area 131 may be relatively small, so that the waste material may not pass through the relief area 131 quickly and be discharged. That is, there is a discharge bottleneck in the relief area 131, and similarly, the waste material inside the battery cell 20 may not be discharged in a timely manner. Therefore, both of these two situations may cause thermal diffusion to occur after the thermal runaway of the battery cell 20, which may further cause the explosion of the battery 10, and affect the safety of the battery 10.

[0058] Conversely, if S2 / (n*S1) is set too large, for example, greater than 8.5, there may be a situation where the area of ​​the pressure relief mechanism 211 is too small, or the area of ​​the relief area 131 corresponding to the pressure relief mechanism 211 is too large. If the area of ​​the pressure relief mechanism 211 is too small, the waste inside the battery cell 20 will not be discharged from the battery cell 20 in a timely and prompt manner, and the battery cell 20 may cause thermal runaway and thermal diffusion, and may even cause the battery 10 to explode, affecting the safety of the battery 10. If the area of ​​the relief area 131 is too large, it may reduce the rigidity and strength of the attachment structure 13 in which the relief area 131 is located, affecting the performance of the attachment structure 13, for example affecting the supporting action of the attachment structure 13 for the battery cell 20.

[0059] Therefore, the value of S2 / (n*S1) in the embodiments of the present application may not be too large or too small. For example, S2 / (n*S1) may be generally set to 0.3, 0.8, 1, 1.5, 1.8, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, or 8.5. Furthermore, for example, the relief area 131 satisfies 0.8≦S2 / (n*S1)≦4, thereby making the area setting of the pressure relief mechanism 211 rational and making it easier for the waste materials from the battery cell 20 to be discharged in a timely manner through this pressure relief mechanism 211; the area of ​​the relief area 131 is not too small, thereby avoiding affecting the normal operation of the pressure relief mechanism 211 and avoiding the discharge of the waste materials; and the area of ​​the relief area 131 is not too large, thereby ensuring the strength and rigidity of the attachment structure 13 in which the relief area 131 is located, and further improving the safety and stability of the battery 10.

[0060] 4 to 6 respectively show some possible local structure schematic diagrams of the battery 10 in the embodiment of the present application. As shown in FIG. 4 to FIG. 6, it is taken as an example that the electrical cavity 11a of the housing 11 of the battery 10 includes a plurality of battery cells 20. Specifically, the electrical cavity 11a may include a plurality of sets of battery cells 20 arranged along the second direction Y. For example, FIG. 4 to FIG. 6 take as an example that the electrical cavity 11a includes two sets of battery cells 20, and each set of battery cells 20 includes a plurality of battery cells 20 arranged along the first direction X. For example, FIG. 4 to FIG. 6 take as an example that each set of battery cells 20 includes eight battery cells 20. It should be understood that the first direction X is perpendicular to the second direction Y, and the embodiment of the present application takes as an example that the first direction X and the second direction Y are both perpendicular to the third direction Z, where the third direction Z may be the height direction of the housing 11 of the battery 10.

[0061] As shown in Figures 4 to 6, in order to clearly show the corresponding relationship between the pressure relief mechanism 211 of the battery cell 20 and the relief area 131 of the attachment structure 13, only the schematic diagram of one set of battery cells 20 is shown in Figures 4 to 6, and the other set of battery cells 20 is not shown. Specifically, in the embodiment of the present application, the projection of the pressure relief mechanism 211 in the direction perpendicular to the first wall 21 is marked as 211', for example, the embodiment of the present application takes the direction perpendicular to the first wall 21 as the third direction Z as an example, and takes the projection 211' of the pressure relief mechanism 211 in the direction perpendicular to the first wall 21 on the attachment structure 13 as an example. Similarly, if the projection of the relief area 131 in the direction perpendicular to the first wall 21 is also taken as the projection on the attachment structure 13 as an example, this projection is the relief area 131 itself, and therefore, in the present application, the projection of the relief area 131 in the direction perpendicular to the first wall 21 is still marked as 131.

[0062] It should be understood that the mounting structure 13 in the embodiment of the present application may have at least one recessed area 131, and each recessed area 131 may correspond to a pressure relief mechanism 211 of at least one battery cell 20, and the embodiment of the present application takes as an example that one pressure relief mechanism 211 is installed in each battery cell 20.

[0063] Optionally, as shown in Fig. 4, the mounting structure 13 of the embodiment of the present application may be provided with a plurality of relief areas 131, which correspond one-to-one to the pressure relief mechanisms 211 of the plurality of battery cells 20, that is, each relief area 131 corresponds to one pressure relief mechanism 211. In this way, one corresponding relief area 131 may be provided for each pressure relief mechanism 211, and there is no need for corresponding relief areas 131 between adjacent pressure relief mechanisms 211, which can save the total area of ​​the relief areas 131 on the mounting structure 13, and further increase the strength and rigidity of the mounting structure 13, thereby improving the stability of the battery 10.

[0064] Optionally, as shown in Fig. 5 instead of Fig. 4, at least one relief area 131 may be provided in the attachment structure 13 of the embodiment of the present application, and each relief area 131 corresponds to a plurality of pressure relief mechanisms 211. In this way, each relief area 131 corresponds to a plurality of pressure relief mechanisms 211, and the number of relief areas 131 provided can be reduced, which makes processing easier, and during assembly, there is no need to provide a one-to-one correspondence between the pressure relief mechanisms 211 and the relief areas 131, which reduces the difficulty of assembly.

[0065] Optionally, as shown in Figures 5 and 6, a plurality of relief areas 131 may be provided on the mounting structure 13, each relief area 131 may correspond to one or more pressure relief mechanisms 211, and the numbers of pressure relief mechanisms 211 corresponding to different relief areas 131 may be the same or different. Specifically, as shown in Figure 5, the numbers of pressure relief mechanisms 211 corresponding to the plurality of relief areas 131 may be the same, for example, each relief area 131 corresponds to a pressure relief mechanism 211 of a set of battery cells 20, which is easy to process. Alternatively, as shown in FIG. 6 , the number of pressure relief mechanisms 211 corresponding to the multiple relief areas 131 may be different. For example, when the number of sets of battery cells 20 arranged along the first direction X is large, multiple relief areas 131 may be installed to correspond to the sets of battery cells 20, and the number of pressure relief mechanisms 211 corresponding to each relief area 131 may be different, thereby making the total area of ​​the relief areas 131 of the attachment structure 13 relatively small, improving the strength and rigidity of the attachment structure 13, and improving the stability of the battery 10.

[0066] 2 to 6, the shape of the relief area 131 in the embodiments of the present application may be set according to actual applications, for example, the shape of the relief area 131 may be set according to the shape and number of the corresponding pressure relief mechanisms 211. For example, when the relief area 131 corresponds one-to-one with the pressure relief mechanism 211, the shape of the relief area 131 may match the pressure relief mechanism 211, and further, when the relief area 131 corresponds to a plurality of pressure relief mechanisms 211, the relief area 131 may be set to a rectangular shape, which is easy to process, but the embodiments of the present application are not limited thereto.

[0067] It should be understood that, as shown in Fig. 2 to Fig. 6, the value range of the area S1 of the projection 211' of the pressure relief mechanism 211 in the direction perpendicular to the first wall 21 may be set according to the actual application. For example, if the area S1 is set too large, the area of ​​the pressure relief mechanism 211 located on the first wall 21 is too large, which reduces the strength of the first wall 21, i.e., reduces the strength of the housing of the battery cell 20, and further affects the structural strength and stability of the battery cell 20. Conversely, if the area S1 is set too small, the area of ​​the pressure relief mechanism 211 is too small, and when the battery cell 20 experiences thermal runaway, the exhaust must be exhausted through the pressure relief mechanism 211; therefore, if the area of ​​the pressure relief mechanism 211 is too small, the exhaust of the battery cell 20 cannot be timely exhausted, which may cause thermal diffusion between the battery cells 20 and even cause the explosion of the battery 10.

[0068] Therefore, it is not preferable to set the area S1 too large or too small. For example, the range of values ​​of the area S1 of the projection 211' in the direction perpendicular to the first wall 21 of the pressure relief mechanism 211 is [50 mm 2 ,3000mm 2 ], and for example, the range of the area S1 is [200 mm 2 ,1500mm 2 ], which will improve the performance of the pressure relief mechanism 211. Specifically, the area S1 is generally set to 50 mm 2 , 100mm 2 , 150mm 2 , 200mm 2 , 250mm 2 , 300mm 2 , 350mm 2 , 400mm 2 , 450mm 2 , 500mm 2 , 600mm 2 , 630mm 2 , 700mm 2 , 800mm 2 , 850mm 2 , 900mm 2 , 1000mm 2 , 1100mm 2 , 1300mm 2, 1500mm 2 , 1800mm 2 , 2000mm 2 , 2500mm 2 , 2800mm 2 Or 3000mm 2 may be set to

[0069] It should be understood that the projected area S2 of the relief area 131 in the direction perpendicular to the first wall 21 in the embodiment of the present application may be set according to actual applications, and the size of the area S2 is related to the number n of the pressure relief mechanisms 211 corresponding to the relief area 131. Specifically, the area of ​​the relief area 131 can be adjusted by reasonably setting the value of S2 / n. For example, if the value of S2 / n is set too large, the area of ​​the area corresponding to one pressure relief mechanism 211 in the relief area 131 will be too large, which will increase the total area of ​​the relief area 131 on the attachment structure 13, and further affect the strength of the attachment structure 13, for example, affecting the supporting effect of the attachment structure 13 on the battery cell 20, and further affecting the structural strength and stability of the battery 10. Conversely, if the value of S2 / n is set too small, the area of ​​the region corresponding to one of the pressure relief mechanisms 211 in the escape area 131 will be too small, which may block at least a part of the pressure relief mechanism 211, affecting the normal operation of the pressure relief mechanism 211 and failing to provide the pressure relief mechanism 211 with sufficient deformation space, thereby affecting the discharge of waste from the battery cells 20 and easily causing thermal diffusion between the battery cells 20, and even causing the battery 10 to explode.

[0070] Therefore, it is not preferable to set the area S2 too large or too small. For example, the projected area S2 of the relief area 131 in a direction perpendicular to the first wall 21 is 50 mm 2 ≦S2 / n≦10000mm 2 For example, this area S2 is further 250 mm 2 ≦S2 / n≦6000mm 2 Specifically, the value of S2 / n is generally 50 mm 2 , 100mm 2 , 150mm2 , 200mm 2 , 250mm 2 , 300mm 2 , 350mm 2 , 400mm 2 , 450mm 2 , 500mm 2 , 600mm 2 , 700mm 2 , 800mm 2 , 900mm 2 , 1000mm 2 , 1200mm 2 , 1500mm 2 , 1920mm 2 , 2000mm 2 , 2380mm 2 , 3000mm 2 , 4000mm 2 , 5000mm 2 , 5500mm 2 , 6000mm 2 , 7000mm 2 , 8000mm 2 , 9000mm 2 or 10,000 mm 2 may be set to

[0071] The above describes the correspondence between the relief area 131 and the pressure relief mechanism 211 of the mounting structure 13 in the embodiment of the present application with reference to the drawings. Below, the mounting structure 13 in the embodiment of the present application will be described in detail with reference to the drawings.

[0072] As shown in Figs. 2 to 5, the housing 11 in the embodiment of the present application includes an electrical cavity 11a, which may be used to accommodate the battery cell 20, and may further be used to accommodate other members, for example, the bus bar member 30, that is, the electrical cavity 11a provides an installation space for the battery cell 20 and the bus bar member 30. The bus bar member 30 is used to realize an electrical connection between the multiple battery cells 20, for example, a parallel connection, a series connection, or a series-parallel connection. The bus bar member 30 can realize an electrical connection between the battery cells 20 by connecting the electrode terminals 212 of the battery cells 20. In some embodiments, the bus bar member 30 may be fixed to the electrode terminals 212 of the battery cells 20 by welding.

[0073] Each battery cell 20 in the embodiment of the present application may include at least two electrode terminals 212, each of which includes at least one positive terminal 212a and at least one negative terminal 212b. The electrode terminals 212 in the embodiment of the present application are electrically connected to tabs of an electrode assembly inside the battery cell 20 and are used to output electrical energy.

[0074] It should be understood that each electrode terminal 212 in the embodiments of the present application may be installed on any one of the walls, and multiple electrode terminals 212 may be installed on the same wall or different walls of the battery cell 20. For example, as shown in Figs. 2 to 6, taking as an example that each battery cell 20 includes two electrode terminals 212, the two electrode terminals 212 may be located on the same wall. Specifically, the two electrode terminals 212 may be located on a wall opposite to the first wall 21, so that when the pressure relief mechanism 211 of the first wall 21 operates, the two electrode terminals 212 are not affected or only slightly affected, thereby avoiding a short circuit between the battery cells 20. Alternatively, unlike those shown in Figs. 2 to 6, the two electrode terminals 212 included in the battery cell 20 may be located on other walls, and the embodiments of the present application are not limited thereto.

[0075] Further, for example, taking each battery cell 20 as an example including two electrode terminals 212, the two electrode terminals 212 may be located on different walls, as shown in Figures 2 to 6. For example, the two electrode terminals 212 of the battery cell 20 may be located on two walls that are installed opposite to each other of the battery cell 20, respectively. Alternatively, the two electrode terminals 212 of the battery cell 20 may be located on two intersecting walls, and the embodiment of the present application is not limited thereto.

[0076] Optionally, as shown in FIG. 2 to FIG. 6, the electrical cavity 11a is different, and the housing 11 of the embodiment of the present application may further include a collection cavity 11b to collect and / or process the effluent discharged through the pressure relief mechanism 211 when the pressure relief mechanism 211 is activated. For example, the collection cavity 11b may collect the effluent from the battery cells 20 when the pressure relief mechanism 211 is activated, and further discharge the effluent to the outside of the battery 10. The collection cavity 11b is used to collect the effluent, and may be sealed or unsealed. In some embodiments, the collection cavity 11b may contain air or other gas. Optionally, the collection cavity 11b may contain a liquid, such as a cooling medium, or a member for containing the liquid may be installed to further reduce the temperature of the effluent entering the collection cavity 11b. Furthermore, optionally, the gas or liquid in the collection cavity 11b may flow in a circulating manner.

[0077] Optionally, as shown in Figures 2 to 6, the battery 10 of the embodiment of the present application further includes an isolation member 114 for isolating the electrical cavity 11a and the collecting cavity 11b. Here, "isolation" means separation, not necessarily sealing. Specifically, the isolation member 114 is used to isolate the electrical cavity 11a and the collecting cavity 11b, that is, the electrical cavity 11a for accommodating the battery cell 20 and the collecting cavity 11b for collecting waste are isolated from each other.

[0078] In the embodiment of the present application, the isolation member 114 may include a wall shared by the electrical cavity 11a and the collecting cavity 11b. As shown in Figures 2 to 6, the isolation member 114 (or a part thereof) may be directly the wall shared by the electrical cavity 11a and the collecting cavity 11b, thus minimizing the distance between the electrical cavity 11a and the collecting cavity 11b, saving space and improving the space utilization rate of the housing 11.

[0079] Optionally, the isolating member 114 of the embodiment of the present application may be a thermal management member for adjusting the temperature of the battery cell 20. Specifically, the isolating member 114 may be used to accommodate a fluid for adjusting the temperature of the battery cell 20. When the temperature of the battery cell 20 is to be lowered, the isolating member 114 may accommodate a cooling medium to adjust the temperature of the battery cell 20, and in this case, the isolating member 114 may be called a cooling member, a cooling system, or a cooling plate. The isolating member 114 may also be used for heating, and the embodiment of the present application is not limited thereto. Optionally, the fluid in the isolating member 114 may circulate to achieve a better temperature adjustment effect.

[0080] It should be understood that the housing 11 in the embodiment of the present application can be realized in various ways, and the embodiment of the present application is not limited thereto. For example, taking Fig. 2 to Fig. 6 as an example, for the electrical cavity 11a, the housing 11 may include a first cover body 110 having an opening, and the isolation member 114 covers the opening of the first cover body 110, and thus the wall for forming the electrical cavity 11a includes the first cover body 110 and the isolation member 114. Here, the first cover body 110 may be realized in various ways. For example, the first cover body 110 may be a hollow monolithic structure with an open end, or the first cover body 110 may include a first portion 111 and a second portion 112 with openings on opposite sides, the first portion 111 covers the opening on one side of the second portion 112, thereby forming the first cover body 110 with an open end, and the isolation member 114 covers the opening on the other side of the second portion 112, thereby forming the electrical cavity 11a. For the corresponding collection cavity 11b, the housing 11 may further include a protection member 115 for protecting the isolation member 114, and the protection member 115 can form the collection cavity 11b together with the isolation member 114, i.e. the wall of the collection cavity 11b includes the protection member 115 and the isolation member 114.

[0081] 2 to 6, the housing 11 may include a sealed second cover body, which may be used to form the electrical cavity 11a, or an isolating member 114 may be installed inside the cover body to isolate the electrical cavity 11a from the inside of the cover body and further isolate the collecting cavity 11b. Here, the second cover body may be realized in various ways, for example, the second cover body may include a third part and a fourth part, and the fourth part has an opening on one side to form a semi-closed structure, the isolating member 114 is installed inside the fourth part, and the third part covers the opening of the fourth part to form a sealed second cover body.

[0082] For ease of description, the present application mainly uses the housing 11 shown in Figures 2 to 6 as an example to describe the battery 10, and the embodiments of the present application are not limited thereto. Specifically, the battery 10 of the embodiment of the present application may include a housing 11, which includes a first cover body 110, an isolation member 114, and a protective member 115, where the first cover body 110 and the isolation member 114 are used to form an electrical cavity 11a, and the isolation member 114 and the protective member 115 are used to form a collection cavity 11b. The first cover body 110 further includes a first portion 111 and a second portion 112 having openings on both opposing sides, where the first portion 111 is used to cover the opening on one side of the second portion 112, thereby forming the first cover body 110 with one end open, and the isolation member 114 is used to cover the opening on the other side of the second portion 112, thereby forming the electrical cavity 11a.

[0083] In the embodiment of the present application, the electrical cavity 11a has multiple walls, and the pressure relief mechanism 211 is installed on the first wall 21 of the battery cell 20, which may be any one of the walls facing the electrical cavity 11a of the battery cell 20. It should be understood that the shape of the battery cell 20 in the embodiment of the present application may be set according to the actual application. For example, the present application mainly describes the rectangular battery cell 20 as an example, but the embodiment of the present application is not limited thereto, for example, the battery cell 20 may also be a cylinder or other shapes. The first wall 21 is any one of the walls of the battery cell 20.

[0084] 2 to 6, in the embodiment of the present application, the electric cavity 11a includes a second wall 12, and the first wall 21 faces the second wall 12. Specifically, the pressure relief mechanism 211 of the battery cell 20 faces the second wall 12 of the electric cavity 11a, not the other battery cells 20, which makes it easy to install an escape structure on the wall of the electric cavity 11a and is used to provide an escape space for the pressure relief mechanism 211 to deform, thereby improving the space utilization rate of the battery 10 and reducing the risk that a battery cell 20 that has experienced thermal runaway will cause thermal runaway in other battery cells 20, thereby improving the safety of the battery 10.

[0085] For example, in FIG. 2 to FIG. 6, the first wall 21 of the battery cell 20 where the pressure relief mechanism 211 is located faces the isolating member 114 as an example, that is, the isolating member 114 is used to form at least a part of the second wall 12. Specifically, as shown in FIG. 2 to FIG. 6, the pressure relief mechanism 211 is installed on the first wall 21 of the battery cell 20, the first wall 21 is the bottom wall of the battery cell 20, and the isolating member 114 is used as at least a part of the second wall 12 of the electrical cavity 11a, and the first wall 21 faces the isolating member 114. In this way, the discharged matter passing through the pressure relief mechanism 211 can be discharged from the electrical cavity 11a through the isolating member 114. For ease of description, the embodiment of the present application mainly takes the second wall 12 as the isolating member 114 as an example, but the embodiment of the present application is not limited thereto.

[0086] For example, the second wall 12 may be another wall of the electrical cavity 11a of the housing 11. For example, the second wall 12 may further be any one of the walls of the second portion 112.

[0087] Further, for example, as shown in Figures 2 to 6, the housing 11 further includes at least one beam 113, which is located between the multiple battery cells 20, and the beam 113 may be used to increase the structural strength of the housing 11. The beam 113 may also be used to divide the electrical cavity 11a into at least two sub-electrical cavities. For example, when one beam 113 is installed in the housing 11 of Figures 2 to 6, the beam 113 can divide the electrical cavity 11a into two sub-electrical cavities, a left one and a right one, and the beam 113 may be regarded as one wall of the electrical cavity 11a.

[0088] Therefore, the second wall 12 may be a beam 113, and the embodiment of the present application is not limited thereto. Specifically, the beam 113 may be a hollow structure, and the hollow structure may be used to form the collection cavity 11b, that is, the beam 113 includes a wall shared by the electrical cavity 11a and the collection cavity 11b. Specifically, the isolation member 114 and the protective member 115 may be used to form a part of the collection cavity 11b, and the hollow structure of the beam 113 may be used to form a part of the collection cavity 11b, i.e., a part of the collection cavity 11b formed by the isolation member 114 and the protective member 115 is connected to the hollow structure of the beam 113, and when the pressure relief mechanism 211 is installed facing this beam 113, i.e., when the beam 113 faces the first wall 21 on which the pressure relief mechanism 211 is located as the second wall 12, the discharged matter discharged through the pressure relief mechanism 211 can enter the collection cavity 11b through the beam 113.

[0089] It should be understood that for ease of explanation, the embodiments of the present application mainly exemplify the use of the isolation member 114 as the second wall 12, but the embodiments of the present application are not limited thereto, and the relevant description also applies to the case where the beam 113 is used as the second wall 12 or the wall of another electrical cavity 11a is used as the second wall 12, and for the sake of brevity, will not be further described here.

[0090] In the embodiment of the present application, the attachment structure 13 includes a second wall 12, that is, the second wall 12 may be provided with a relief area 131, which corresponds to the pressure relief mechanism 211 of at least one battery cell 20, so that the exhaust gas passing through the pressure relief mechanism 211 can be further discharged through the relief area 131 of the second wall 12. By reasonably setting the area size of the relief area 131 in the second wall 12, the exhaust gas can be discharged in a timely and rapid manner, the occurrence of thermal diffusion and explosion can be avoided, and the safety of the battery 10 can be improved. Furthermore, when the second wall 12 is an isolation member 114, the discharged matter can be discharged to the collection cavity 11b through the isolation member 114, and when the isolation member 114 is a thermal management member, the area of ​​the relief area 131 can be reasonably set to avoid, for example, that it is undesirable to set the area of ​​the relief area 131 too large, and that too many relief areas 131 will excessively reduce the space of the flow path for accommodating the fluid of the thermal management member, and further affect the efficiency of temperature regulation of the thermal management member.

[0091] It should be understood that the relief area 131 in the embodiment of the present application can be realized in various ways. For example, as shown in Figures 2 to 6, the relief area 131 includes a through hole 121 penetrating the second wall 12, the through direction is in the thickness direction of the second wall 12, and the through hole 121 is used to allow the exhaust discharged from the pressure relief mechanism 211 to be discharged from the electrical cavity 11a through the through hole 121 when the pressure relief mechanism 211 is operated. The relief area 131 includes the through hole 121 disposed in the second wall 12, which is easy to process on the one hand, and the through hole 121 provides a deformation space for the pressure relief mechanism 211, and at the same time, allows the exhaust discharged from the pressure relief mechanism 211 to be quickly discharged through the through hole 121.

[0092] Optionally, FIG. 7 shows another structural schematic diagram of the battery 10 of the embodiment of the present application. As shown in FIG. 7, the difference with the battery 10 shown in FIG. 2 is that the battery 10 may further include a sealing structure 122. Specifically, as shown in FIG. 7, the second wall 12 is provided with a sealing structure 122, which is used to seal the through-hole 121, and the sealing structure 122 is broken when the pressure relief mechanism 211 is activated to allow the discharged material to pass through the through-hole 121. When the relief area 131 includes the through-hole 121, it is considered to expose the pressure relief mechanism 211, so that in the process of using the battery 10, the pressure relief mechanism 211 is easily affected by the external environment, which may further cause the failure of the pressure relief mechanism 211. Therefore, by installing this sealing structure 122, on the one hand, during normal use of the battery cell 20, the sealing property of the electrical cavity 11a can be maintained and the pressure relief mechanism 211 can be protected from being affected by the external environment; on the other hand, when thermal runaway occurs in the battery cell 20, this sealing structure 122 can be broken in a timely manner to expose the through-hole 121, and the waste from the battery cell 20 can be discharged from the electrical cavity 11a through this through-hole 121, thereby avoiding thermal runaway and improving the safety of the battery 10.

[0093] Optionally, the position of the sealing structure 122 in the embodiment of the present application may be set according to the actual application. For example, as shown in Fig. 7, the sealing structure 122 is installed on the surface of the second wall 12 facing the first wall 21, and / or the sealing structure 122 is installed on the surface of the second wall 12 away from the first wall 21, thereby facilitating processing. Also, as shown in Fig. 7, when the sealing structure 122 is installed on the surface of the second wall 12 away from the first wall 21, the distance between the pressure relief mechanism 211 and the sealing structure 122 can provide a deformation space for the operation of the pressure relief mechanism 211, and avoid affecting the pressure relief mechanism 211. When the sealing structure 122 is installed on the surface of the second wall 12 facing the first wall 21, the sealing structure 122 is close to the pressure relief mechanism 211 and can be quickly destroyed by the discharge of the pressure relief mechanism 211, for example, can quickly respond to the temperature of the battery cell 20, can quickly melt the sealing structure 122, avoiding affecting the operation of the pressure relief mechanism 211, and can timely discharge the discharge, for example, can timely discharge the discharge into the collection cavity 11b.

[0094] Optionally, the relief area 131 in the embodiment of the present application may also be realized in other ways. FIG. 8 shows another structural schematic diagram of the battery 10 in the embodiment of the present application, and as shown in FIG. 8, the relief area 131 may also be realized in the way of a groove. Specifically, the relief area 131 includes a groove 123 whose opening in the second wall 12 faces the pressure relief mechanism 211, and the groove 123 is broken when the pressure relief mechanism 211 operates, so that the discharged material discharged from the pressure relief mechanism 211 passes through the second wall 12 and is discharged from the electrical cavity 11a. In this way, the opening of the groove 123 faces the pressure relief mechanism 211, and the inside of the groove 123 can provide a deformation space for the pressure relief mechanism 211, thereby facilitating the operation of the pressure relief mechanism 211 and the discharged material.

[0095] It should be understood that when the attachment structure 13 in which the relief area 131 is located includes a second wall 12, there may be direct contact between the second wall 12 and the first wall 21, or further structures may be provided, for example, a connecting structure may be provided between the second wall 12 and the first wall 21, used to connect and secure the second wall 12 and the first wall 21.

[0096] FIG. 9 shows another exploded structure schematic diagram of the battery 10 of the embodiment of the present application. Different from FIG. 3, as shown in FIG. 9, the battery 10 further includes a connection structure 14 installed between the first wall 21 and the second wall 12. The attachment structure 13 includes the connection structure 14. The connection structure 14 is installed between the first wall 21 and the second wall 12. On the one hand, when the battery cell 20 does not have thermal runaway, the connection structure 14 can realize the relative fixation between the first wall 21 and the second wall 12 and the sealing between the first wall 21 and the second wall 12; on the other hand, the attachment structure 13 can include the connection structure 14, that is, the connection structure 14 includes a relief area 131, which can avoid the shielding of the pressure relief mechanism 211 of the connection structure 14, and can smoothly discharge the discharged material.

[0097] 9, the connecting structure 14 is provided with an escape opening 141 corresponding to the pressure relief mechanism 211, and the escape area 131 includes the escape opening 141. The escape opening 141 can provide a deformation space when the pressure relief mechanism 211 operates, thereby preventing the connecting structure 14 from blocking the pressure relief mechanism 211 and causing the pressure relief mechanism 211 to operate untimely, and allowing the discharged matter that has passed through the pressure relief mechanism 211 to be quickly discharged through the escape opening 141.

[0098] It should be understood that the connection structure 14 in the embodiments of the present application can be realized in various ways. For example, the connection structure 14 is used to prevent the discharged matter discharged from the pressure relief mechanism 211 from entering the electrical cavity 11a when the pressure relief mechanism 211 is activated. The connection structure 14 can be a sealant, in particular, when the pressure relief mechanism 211 is activated, the connection structure 14 is located between the first wall 21 and the second wall 12, and can prevent the discharged matter from entering the electrical cavity 11a through the connection structure 14. In this way, the discharged material that has passed through the pressure relief mechanism 211 can be directly discharged from the electrical cavity 11a through the escape opening 141 of the connection structure 14 and the second wall 12, respectively, for example, directly discharged into the collection cavity 11b, thereby avoiding the battery cells 20 in the electrical cavity 11a from short-circuiting after the discharged material enters the electrical cavity 11a, causing thermal diffusion and even explosion, and further enabling the discharged material to be collected in a concentrated manner, making it easier to process the discharged material in a concentrated manner, avoiding the discharged material from affecting other components in the battery 10, and improving the safety of the battery 10.

[0099] Further, for example, the connection structure 14 is used to discharge the effluent discharged from the pressure relief mechanism 211 to the electrical cavity 11a when the pressure relief mechanism 211 is activated. In this way, the requirements for the sealing property of the connection structure 14 can be reduced and the connection structure 14 is easy to implement, and some of the effluent can be discharged to the electrical cavity 11a through the connection structure 14, while some of the effluent can be discharged from the electrical cavity 11a through the connection structure 14 and the second wall 12, which not only increases the discharge speed and reduces the risk of explosion of the battery 10, but also realizes directional and dispersed discharge, avoids the impact of the effluent on other components, and improves the safety and stability of the battery 10.

[0100] Discharging the effluent to the electric cavity 11a through the connection structure 14 can be realized in various ways. For example, FIG. 10 shows a schematic diagram of a local structure of the battery 10 in the embodiment of the present application, and the battery 10 shown in FIG. 10 may be the battery 10 shown in FIG. 9, and the direction shown in FIG. 10 is opposite to that shown in FIG. 9. As shown in FIG. 10, the connection structure 14 is provided with a flow path 142 for discharging the effluent discharged from the pressure relief mechanism 211 to the electric cavity 11a when the pressure relief mechanism 211 is operated. The effluent discharged through the pressure relief mechanism 211 can be discharged into the electric cavity 11a through the flow path 142. In this way, the position of the flow path 142 can be reasonably set to realize directional discharge of the effluent, which reduces the impact of the effluent on individual components in the electric cavity 11a, and further improves the safety of the battery 10.

[0101] Specifically, as shown in FIG. 10, the flow passage 142 in the embodiment of the present application includes a through hole and / or a groove penetrating the connection structure 14, which is easy to process and allows waste to pass through quickly.

[0102] It should be understood that the size of the flow passage 142 in the embodiment of the present application may be set according to the actual application. For example, the radial size of the flow passage 142 is 2 mm or less, and the radial direction of the flow passage 142 is perpendicular to the flow direction of the effluent in the flow passage 142, thereby avoiding the size of the flow passage 142 being too large, avoiding the excess of the effluent flowing through the flow passage 142, avoiding the particle size of the effluent flowing through the flow passage 142 being large and having a filtering effect on the effluent, and further reducing the impact of the effluent of the thermal runaway battery cell 20 on the other battery cells 20, and avoiding the thermal diffusion of the battery 10 as much as possible. Specifically, when the flow passage 142 is a through hole, the radial size of the flow passage 142 may be the maximum value of the hole diameter of the flow passage 142, and when the flow passage 142 is a groove, the radial size of the flow passage 142 may be the maximum value of the depth or width of the groove, and the embodiment of the present application is not limited thereto.

[0103] It should be understood that a filler may be installed in the flow passage 142, and by reasonably setting the melting point of the filler, the filler is used to seal the flow passage 142 when the pressure relief mechanism 211 is not activated, and is destroyed, for example melted, when the pressure relief mechanism 211 is activated, thereby allowing the flow of the flow passage 142 to be conducted, thereby improving the sealing of the electrical cavity 11a when the battery cell 20 does not experience thermal runaway, and preventing the battery cell 20 from being affected or destroyed. Here, the material of the filler may be selected according to the actual application, for example, the material of the filler may include foam adhesive and / or plastic, but the embodiment of the present application is not limited thereto.

[0104] In the embodiment of the present application, the flow channel 142 is taken as an example to be a groove installed in the connecting structure 14. As shown in Fig. 10, the connecting structure 14 may include a plurality of flow channels 142, and the plurality of flow channels 142 may include a groove installed on the surface of the connecting structure 14 facing the first wall 21, i.e., a groove whose opening faces the surface of the first wall 21, and / or a groove installed on the surface of the connecting structure 14 facing the second wall 12, i.e., a groove whose opening faces the second wall 12. For example, in Fig. 10, the flow channel 142 is taken as an example to be a groove installed on the surface of the connecting structure 14 facing the second wall 12, i.e., the opening of the groove faces the second wall 12.

[0105] In some embodiments, the connecting structure 14 is provided with a plurality of channels 142 extending along at least one direction, where at least one direction is parallel to the first wall 21, i.e., a plurality of channels 142 extending along one or more directions are provided on a relatively large surface area of ​​the connecting structure 14. By providing a plurality of channels 142, the discharge direction of the exhaust can be dispersed, and when the high-temperature exhaust is discharged in a single direction, damage to the components in this direction can be avoided.

[0106] It should be understood that the extension direction of the flow passage 142 in the embodiment of the present application may be set according to actual applications. For example, the extension direction of the flow passage 142 can be reasonably set according to the positional relationship between the electrode terminal 212 of the battery cell 20 and the pressure relief mechanism 211, so as to avoid the influence of the discharged matter on the electrode terminal 212 and the busbar member 30 connected to the electrode terminal 212.

[0107] For example, as shown in FIG. 10, when the electrode terminal 212 and the pressure relief mechanism 211 are not located on the same wall, and the wall on which the electrode terminal 212 is located does not intersect with the first wall 21, for example, the wall on which the electrode terminal 212 is located is installed opposite to the first wall 21, the extension direction of the flow channel 142 may not be limited. For example, the flow channel 142 may include one or more first X-direction flow channels 142a extending along a first direction X installed in the connection structure 14, and / or one or more second Y-direction flow channels 142b extending along a second direction Y installed in the connection structure 14, or the flow channel 142 may further include flow channels in other directions installed in the connection structure 14, and the embodiment of the present application is not limited thereto. Here, the first direction X and the second direction Y are perpendicular to each other, and for example, as shown in FIG. 10, the first direction X may be the thickness direction of the battery cell 20. Moreover, the height direction Z of the battery cell 20 in the embodiment of the present application is perpendicular to the first direction X and the second direction Y.

[0108] Furthermore, for example, as shown in FIG. 10 , when the electrode terminal 212 is located on another wall, for example, when the electrode terminal 212 is located on a wall intersecting with the first wall 21, or when the electrode terminal 212 is located on the first wall 21, by rationally setting the direction of the flow path 142, the influence of the discharge on the electrode terminal 212 can be avoided, for example, a short circuit between different bus bar members 30 connecting the electrode terminals 212 due to metal chips in the discharge can be avoided, further improving the safety of the battery 10.

[0109] Alternatively, the connection structure 14 may be installed in other ways. For example, the connection structure 14 is broken when the pressure relief mechanism 211 is activated to form a gap between the first wall 21 and the second wall 12, and the gap is used to discharge the waste discharged from the pressure relief mechanism 211 to the electrical cavity 11a. By rationally selecting the material of the connection structure 14, a suitable melting point of the connection structure 14 can be obtained, so that the connection structure 14 is broken when the pressure relief mechanism 211 is activated to form a further gap, thereby discharging the waste to the electrical cavity 11a, in this way, there is no need to install an additional structure on the connection structure 14, which is more convenient and can also ensure the sealing property of the battery cell 20 during normal use.

[0110] Specifically, in the embodiments of the present application, the destruction of the connection structure 14 may include the destruction of at least a part of the connection structure 14. For example, when the pressure relief mechanism 211 is activated, only the exterior of the connection structure 14 may be destroyed, and some inner members of the exposed connection structure 14 may not be destroyed, or the internal structure of the connection structure 14 may be destroyed; for example, the connection structure 14 may be a multi-layer structure, and some structural layers in the multi-layer structure may be destroyed, or the connection structure 14 may be completely destroyed; the embodiments of the present application are not limited thereto.

[0111] It should be understood that the connection structure 14 in the embodiment of the present application may be installed according to actual applications, for example, the connection structure 14 may include at least one of a bracket, a heat conductive pad, a gasket, and an adhesive installed between the first wall 21 and the second wall 12. Specifically, the connection structure 14 may include a bracket installed between the first wall 21 and the second wall 12 to support and fix the battery cell 20.

[0112] Optionally, the connection structure 14 may include a heat conduction pad installed between the first wall 21 and the second wall 12, and the heat conduction pad can dissipate heat from the battery cell 20 during the use of the battery 10. For example, if the second wall 12 is a thermal management member, the heat of the battery cell 20 can be transferred to the thermal management member by the heat conduction pad to timely adjust the temperature of the battery cell 20 and ensure the normal use of the battery cell 20. For example, as shown in FIG. 10, the connection structure 14 may include a heat conduction pad, and the heat conduction pad may be a portion where a plurality of Y-direction second channels 142b extending along the second direction Y in the figure are installed.

[0113] Optionally, the connection structure 14 may include a gasket disposed between the first wall 21 and the second wall 12 to improve sealing between the first wall 21 and the second wall 12. For example, as shown in Fig. 10, the connection structure 14 may include a gasket, and the gasket may be a portion having a plurality of X-direction first flow channels 142a extending along the first direction X in the figure.

[0114] Optionally, the connection structure 14 may include an adhesive disposed between the first wall 21 and the second wall 12 to adhesively secure the battery cell 20 to the second wall 12. For example, the adhesive included in the connection structure 14 may be used to secure the battery cell 20 to the second wall 12.

[0115] It should be understood that the thermal conductive pad, the gasket, and the adhesive may be used alone or in combination. For example, as shown in FIG. 10, the gasket may be installed on at least one edge of the thermal conductive pad, for example, the gasket may be installed on both opposite edges of the thermal conductive pad, which can not only be used for heat dissipation but also improve the sealing between the first wall 21 and the second wall 12. And, in order to improve the stability of the battery 10, an adhesive may be used to fix the gasket and the thermal conductive pad to the battery cell 20 or the second wall 12.

[0116] It should be understood that the materials of the thermal conduction pad, the gasket and the adhesive in the embodiments of the present application may all be selected according to the actual application. For example, the material of the thermal conduction pad may include thermally conductive silica gel. For further example, the material of the gasket may include at least one of silicone rubber, polypropylene (PP), soluble polytetrafluoroethylene (Polyfluoroalkoxy, PFA) and polyimide (PI). For further example, the material of the adhesive may include at least one of epoxy structural adhesive, acrylate structural adhesive, polyimide structural adhesive, maleimide structural adhesive, polyurethane structural adhesive and acrylic adhesive. For further example, the material of the adhesive layer may include a polymer adhesive and a thermally conductive material, the material of the polymer adhesive may include at least one of epoxy resin, organic silica gel and polyimide, and the thermally conductive material may include Al. 2 O 3 , ZnO, BeO, AlN, Si 3 N 4 , BN, SiC, B 4 C, carbon nanotubes, and graphite nanosheets, but the examples of the present application are not limited thereto.

[0117] In an embodiment of the present application, a pressure relief mechanism 211 is provided on the first wall 21 of the battery cell 20, and a relief area 131 is provided on the attachment structure 13 attached to this first wall 21. This relief area 131 satisfies 0.3≦S2 / (n*S1)≦8.5. Therefore, by rationally setting the area size of this relief area 131, the safety of this battery 10 can be improved.

[0118] Specifically, when S2 / (n*S1) is set too small, for example, smaller than 0.3, there may be a situation where the area of ​​the pressure relief mechanism 211 is relatively large, but the area of ​​the relief area 131 corresponding to the pressure relief mechanism 211 is relatively small. Thus, on the one hand, the relief area 131 may not be able to provide the pressure relief mechanism 211 with sufficient deformation space, so that at least a part of the pressure relief mechanism 211 is blocked by the relief area 131 and cannot operate normally, and furthermore, the waste material inside the battery cell 20 cannot be discharged in a timely manner. On the other hand, when the pressure relief mechanism 211 can operate normally, the area of ​​the relief area 131 may be relatively small, so that the waste material may not pass through the relief area 131 quickly and be discharged, that is, there is a discharge bottleneck in the relief area 131, and similarly, the waste material inside the battery cell 20 cannot be discharged in a timely manner. Therefore, both of these two situations may cause thermal diffusion after the thermal runaway of the battery cell 20, which may further cause the explosion of the battery 10, and affect the safety of the battery 10.

[0119] Conversely, if S2 / (n*S1) is set too large, for example, greater than 8.5, there may be a situation where the area of ​​the pressure relief mechanism 211 is too small, or the area of ​​the relief area 131 corresponding to the pressure relief mechanism 211 is too large. If the area of ​​the pressure relief mechanism 211 is too small, the waste inside the battery cell 20 will not be discharged from the battery cell 20 in a timely and prompt manner, and the battery cell 20 may cause thermal runaway and thermal diffusion, and may even cause the battery 10 to explode, affecting the safety of the battery 10. If the area of ​​the relief area 131 is too large, it may reduce the rigidity and strength of the attachment structure 13 in which the relief area 131 is located, affecting the performance of the attachment structure 13, for example affecting the supporting action of the attachment structure 13 for the battery cell 20.

[0120] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto and equivalents can be substituted for its components without departing from the scope of the present application. In particular, unless there is a structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed in the specification, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, A housing (11) containing an electrical cavity (11a); a battery cell (20) accommodated in the electrical cavity (11a), the battery cell (20) having a pressure relief mechanism (211) installed on a first wall (21) of the battery cell (20); and an attachment structure (13) attached to the first wall (21), the attachment structure (13) is provided with a relief area (131), the relief area (131) is used to provide a deformation space for the pressure relief mechanism (211) of at least one of the battery cells (20), and the relief area (131) satisfies 0.3≦S2 / (n*S1)≦8.5; Here, S1 is the projected area of ​​the pressure relief mechanism (211) in a direction perpendicular to the first wall (21), S2 is the projected area of ​​the relief region (131) in a direction perpendicular to the first wall (21), n ​​is the number of pressure relief mechanisms (211) corresponding to the relief region (131), and n is a positive integer.

2. 2. The battery according to claim 1, wherein the relief area (131) satisfies 0.8≦S2 / (n*S1)≦4.

3. The range of the value of the projection area S1 of the pressure relief mechanism (211) in a direction perpendicular to the first wall (21) is [50 mm 2 , 3000 mm 2 3. The battery according to claim 1, wherein

4. The projection area S2 of the relief area (131) in a direction perpendicular to the first wall (21) is 50 mm 2 ≦S2 / n≦10000 mm 2 The battery according to any one of claims 1 to 3, characterized in that

5. The battery according to any one of claims 1 to 4, wherein the relief area (131) corresponds to a plurality of the pressure relief mechanisms (211).

6. 6. The battery according to claim 1, wherein the electrical cavity (11a) comprises a second wall (12), and the first wall (21) faces the second wall (12).

7. 7. The battery of claim 6, wherein the attachment structure (13) comprises the second wall (12).

8. The battery of claim 7, characterized in that the relief area (131) includes a through hole (121) penetrating the second wall (12), the penetrating direction being in the thickness direction of the second wall (12), and the through hole (121) is used to discharge a discharged substance discharged from the pressure relief mechanism (211) through the through hole (121) from the electrical cavity (11a) when the pressure relief mechanism (211) is activated.

9. 9. The battery of claim 8, wherein a sealing structure (122) is provided on the second wall (12), the sealing structure (122) is used to seal the through hole (121), and the sealing structure (122) is used to be broken when the pressure relief mechanism (211) is activated to allow the discharged material to pass through the through hole (121).

10. the sealing structure (122) is located on a surface of the second wall (12) facing the first wall (21); and / or 10. The battery of claim 9, wherein the sealing structure (122) is located on a surface of the second wall (12) remote from the first wall (21).

11. The battery according to any one of claims 7 to 10, characterized in that the relief area (131) includes a groove (123) whose opening in the second wall (12) faces the pressure relief mechanism (211), and the groove (123) is broken when the pressure relief mechanism (211) is activated, and is used to pass exhaust discharged from the pressure relief mechanism (211) through the second wall (12) and discharge it from the electrical cavity (11a).

12. The battery comprises:

12. The battery according to claim 6, further comprising a connection structure (14) disposed between the first wall (21) and the second wall (12), and the attachment structure (13) comprises the connection structure (14).

13. The battery according to claim 12, characterized in that the connection structure (14) is provided with an escape opening (141) corresponding to the pressure relief mechanism (211), and the escape area (131) includes the escape opening (141).

14. 14. The battery according to claim 12 or 13, characterized in that the connection structure (14) is used to prevent waste discharged from the pressure relief mechanism (211) from entering the electrical cavity (11a) when the pressure relief mechanism (211) is activated.

15. 14. The battery according to claim 12 or 13, characterized in that the connection structure (14) is used to discharge a discharged substance discharged from the pressure relief mechanism (211) to the electrical cavity (11a) when the pressure relief mechanism (211) is activated.

16. The battery according to claim 15, characterized in that the connection structure (14) is provided with a flow path (142) for discharging a discharged substance discharged from the pressure relief mechanism (211) to the electrical cavity (11a) when the pressure relief mechanism (211) is activated.

17. 17. The battery according to claim 15 or 16, characterized in that the connection structure (14) is used to break when the pressure relief mechanism (211) is activated to form a gap between the first wall (21) and the second wall (12), and the gap is used to discharge discharged matter discharged from the pressure relief mechanism (211) to the electrical cavity (11a).

18. The battery comprises:

18. The battery of claim 6, further comprising a collection cavity (11b) for collecting exhaust from the battery cells (20) when the pressure relief mechanism (211) is activated.

19. The battery comprises:

20. The battery of claim 18, further comprising an isolating member (114) for isolating said electrical cavity (11a) and said collecting cavity (11b).

20. The battery of claim 19, wherein the isolation member (114) is formed as at least a portion of the second wall (12).

21. A power consuming device, 21. A power consumer device comprising a battery according to any one of claims 1 to 20, the battery being adapted to provide electrical energy to the power consumer device.

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