Batteries and power consuming devices

Abstract

The present application provides a battery and a power consumption device, the battery including a housing, a battery cell module, and a support member, the housing including an electrical cavity, the battery cell module being accommodated in the electrical cavity, the battery cell module including a plurality of battery cells arranged along a first direction, at least two battery cells in the battery cell module are provided with pressure reducing mechanisms, the pressure reducing mechanisms are provided on first walls of the battery cells, the support member is attached to the first wall to support the battery cells, the support member includes relief cavities corresponding to the at least two pressure reducing mechanisms in the battery cell module, the relief cavities are used to provide deformation space for the operation of the at least two pressure reducing mechanisms. The battery and the power consumption device of the present application can enhance 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. Currently, in the development of battery technology, in addition to improving the performance of batteries, the safety issues of batteries are also an issue that cannot be ignored. If it is difficult to guarantee the safety issues of batteries, the batteries cannot be put into use. Therefore, how to improve the safety performance of batteries is a technical issue that needs to be solved as soon as possible in the field of battery technology. Summary of the Invention

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

[0004] According to a first aspect, there is provided a battery including a housing, a battery cell module, and a support member, the housing including an electrical cavity, the battery cell module being accommodated in the electrical cavity, the battery cell module including a plurality of battery cells arranged along a first direction, a pressure reduction mechanism being installed in at least two battery cells in the battery cell module, the pressure reduction mechanism being installed in a first wall of the battery cells, a support member being attached to the first wall to support the battery cells, the support member including relief cavities corresponding to the at least two pressure reduction mechanisms in the battery cell module, the relief cavities being used to provide a deformation space for operation of the at least two pressure reduction mechanisms.

[0005] Therefore, in the embodiment of the present application, a support member is installed on the battery, and the support member is attached to the first wall of the battery cell, so that the first wall can provide a support function for the battery cell, and therefore the first wall has excellent compressive strength. When an external pressure acts on the battery, the installed support member can prevent most or even all of the external pressure, thereby reducing or eliminating the effect of the external pressure on the battery cell, and improving the pressure resistance and safety performance of the battery. In addition, a pressure reducing mechanism is further installed on the first wall of the battery cell, and the support member is provided with relief cavities corresponding to at least two pressure reducing mechanisms in the battery cell module, so that when the pressure reducing mechanism is operated, the relief cavities of the support member are used to provide a deformation space for the pressure reducing mechanism, preventing the support member from blocking the pressure reducing mechanism, and allowing the exhaust of the battery cell to be smoothly discharged from the pressure reducing mechanism.

[0006] In some embodiments, a relief opening is provided on the surface of the support member adjacent to the battery cell module, at least two of the pressure reducing mechanisms face the relief opening, and the relief cavity communicates with the relief opening, so that by providing the relief opening on the surface of the support member adjacent to the battery cell module, during the operation of the pressure reducing mechanism, the discharged matter discharged from the pressure reducing mechanism can quickly enter the relief cavity through the relief opening, and the discharged matter is prevented from accumulating in the electrical cavity, thereby minimizing the discharged matter being conducted to the electrical connection member in the electrical cavity to cause a short circuit, and improving the safety of the battery.

[0007] In some embodiments, when the pressure reducing mechanism is activated, the exhaust from the battery cell enters the relief cavity through the relief opening and is discharged from the relief cavity. When thermal runaway occurs in the battery cell, due to the limited space inside the relief cavity, the exhaust discharged through the pressure reducing mechanism is likely to accumulate in the relief cavity and cause thermal impact on the pressure reducing mechanism, which leads to thermal diffusion between the battery cells. However, the embodiments of the present application are advantageous in that the exhaust quickly enters the relief cavity through the relief opening and discharges the exhaust to the outside of the relief cavity, which avoids thermal diffusion caused by the exhaust accumulating in the relief cavity, thereby improving the safety of the battery.

[0008] In some embodiments, the relief cavities and / or relief openings are arranged continuously along the first direction, so that in the embodiments of the present application, the relief cavities can be arranged continuously along the first direction, the relief cavities can correspond to a plurality of pressure reduction mechanisms, and / or the relief openings can be arranged continuously along the first direction, the relief openings can correspond to a plurality of pressure reduction mechanisms, thereby avoiding a situation in which one or more of the pressure reduction mechanisms do not correspond to the relief cavities or do not correspond to the relief openings for the plurality of pressure reduction mechanisms arranged along the first direction, i.e. avoiding the existence of a situation in which the pressure reduction mechanism between two adjacent relief cavities does not correspond to the relief cavity, and also avoiding the existence of a situation in which the pressure reduction mechanism between two adjacent relief openings does not correspond to the relief opening, and all of the exhaust from each pressure reduction mechanism among the plurality of pressure reduction mechanisms arranged along the first direction can enter the relief cavity through the relief opening, and at the same time, the structure is simple and easy to process and assemble the battery.

[0009] In some embodiments, the relief cavity is located in a weak area, and the weak area is used for discharging the discharged material through the weak area when the pressure reducing mechanism is activated, so that when the battery cell experiences thermal runaway, the discharged material discharged through the pressure reducing mechanism can enter the relief cavity and then be discharged through the weak area of ​​the relief cavity, which not only effectively avoids the heat diffusion caused by the discharged material accumulating in the relief cavity, but also realizes directional discharge, for example, the position of the weak area can be rationally set to discharge the discharged material from a specific area, and prevent the discharged material from affecting other components, thereby improving the safety of the battery.

[0010] In some embodiments, the weakened area is broken when the pressure reducing mechanism is activated, so that the exhaust gas can be discharged from the relief cavity. Thus, when the pressure reducing mechanism is not activated, for example, during normal use of the battery, the relief cavity is in a relatively sealed state, and the relief cavity can be effectively protected from being broken by external forces. When the pressure reducing mechanism is activated, the strength of the weakened area on the relief cavity is lower than that of the other areas on the relief cavity, so that the weakened area is easily broken, and the exhaust gas from the battery cell can pass through the weakened area and be discharged to the outside of the relief cavity.

[0011] In some embodiments, the relief cavity includes a bottom wall and a side wall, the bottom wall is disposed opposite the first wall, the side wall is connected to the bottom wall and extends toward the first wall, and the weakened area is disposed in the bottom wall and / or the side wall.

[0012] In the embodiment of the present application, when the weak area is installed on the bottom wall of the relief cavity, in the situation where thermal runaway occurs in the battery cell, the effluent discharged through the pressure reducing mechanism can be directly and quickly discharged to the outside of the relief cavity through the bottom wall of the relief cavity, improving the safety of the battery. In addition, in the situation where thermal runaway occurs in the battery cell, when the high-temperature and high-pressure effluent discharged through the pressure reducing mechanism enters the relief cavity, it is discharged toward the side wall of the relief cavity, and due to the blocking effect of the side wall of the relief cavity, it accumulates in the area close to the side wall. Therefore, by installing the weak area on the side wall of the relief cavity, it is favorable to immediately discharge the effluent and effectively prevent the effluent from accumulating on the side wall of the relief cavity.

[0013] In some embodiments, the weakened area is located at an edge along the first direction of the bottom wall and / or the side wall.

[0014] In the embodiments of the present application, when thermal runaway occurs in a battery cell, the side walls of the relief cavity block the emissions, so that the emissions generally accumulate most at the intersection between the bottom wall and the side wall of the relief cavity. At the same time, in some circumstances, due to poor sealing at the intersection between the bottom wall and the side wall of the relief cavity, an airflow passage is formed at the poorly sealed portion of the intersection. Under the action of the internal and external pressure difference, the airflow generated during the thermal runaway of the battery will move the emissions to the intersection between the bottom wall and the side wall of the relief cavity, and further promote the accumulation of the emissions at the intersection between the bottom wall and the side wall of the relief cavity. In addition, in a situation where multiple pressure reduction mechanisms corresponding to the relief cavities are arranged along the first direction, the side walls of the relief cavities are smaller in size than the other walls, so that the discharged material discharged through the pressure reduction mechanisms accumulates most at the ends of the bottom wall and / or side walls of the relief cavities along the first direction, which is likely to cause thermal diffusion of the battery cells. By providing a weak area at the ends of the bottom wall and / or side walls along the first direction, thermal diffusion caused by the discharged material accumulating in the relief cavities can be effectively avoided, thereby improving the safety of the battery.

[0015] In some embodiments, the weakened area satisfies the following:

number

[0016] Therefore, in the embodiment of the present application, the value of d / E is set reasonably so that the effluent generated by the battery cell can be discharged immediately and smoothly, thereby improving the safety of the battery. Specifically, if the value of d / E is set too large, the minimum thickness d of the weak area of ​​the relief cavity is set relatively large, and the volumetric energy density E of the battery cell may be set relatively small. Thus, if the temperature or pressure of the effluent discharged in the event of thermal runaway occurring in the battery cell is low and the minimum thickness d of the weak area of ​​the relief cavity is set too large, it may be difficult for the effluent to destroy the relief cavity and immediately discharge the effluent, or it may take too long to destroy the relief cavity, and ultimately the effluent is restricted within the relief cavity under the pressure reducing mechanism, and the space of the relief cavity is limited, which may easily cause the thermal diffusion phenomenon between the battery cells. Therefore, it is not preferable to set the value of d / E too large.

[0017] Conversely, it is also undesirable to set the value of d / E too small. Due to structural constraints of the battery cell itself, there is an upper limit to the volumetric energy density E of the battery cell. Therefore, if the value of d / E is set too small, that is, in a situation where the volumetric energy density E of the battery is constant, the minimum thickness d of the weak area of ​​the relief cavity becomes small, the structural strength of the relief cavity is insufficient, and breakage is likely to occur under normal battery use conditions, the sealing performance of the relief cavity is reduced, and the safety of the battery is also reduced.

[0018] In some embodiments, the weakened area satisfies the following:

number

[0019] Therefore, in the embodiment of the present application, the value of T1 / E can be set reasonably so that the waste generated by the battery cell can be discharged immediately and smoothly, and the safety of the battery is improved. Therefore, it is not preferable to set the value of T1 / E in the embodiment of the present application too small. Due to the structural constraints of the battery cell itself, there is an upper limit to the volumetric energy density E of the battery cell. Therefore, if the value of T1 / E is too small, that is, under the situation where the volumetric energy density E of the battery cell is constant, the melting point T1 value of the material of the weak area of ​​the relief cavity is small, on the one hand, the difficulty of material selection increases, and on the other hand, the structural strength of the relief cavity is also insufficient. In the normal use of the battery, for example, during the charging and discharging process, there may be a situation where the battery temperature rises, and the weak area of ​​the relief cavity is easy to soften or melt in the normal use of the battery, which reduces the sealing property of the relief cavity and also reduces the safety of the battery.

[0020] In the embodiment of the present application, it is not preferable to set the value of T1 / E too large. When the value of T1 / E is too large, that is, the melting point T1 of the material of the weak area of ​​the relief cavity is set relatively large, and the volumetric energy density E of the battery cell is set relatively small, so that the temperature of the effluent discharged through the pressure reducing mechanism when the thermal runaway occurs in the battery cell is low, and when the melting point T1 of the material of the weak area of ​​the relief cavity is set too high, the effluent melts the weak area of ​​the relief cavity and is difficult to discharge the effluent immediately, or the time taken to melt the weak area of ​​the relief cavity is too long, so that the effluent is restricted in the relief cavity corresponding to the pressure reducing mechanism, and the space of the relief cavity is limited, which is easy to cause the heat diffusion phenomenon between the battery cells.

[0021] In some embodiments, the thickness of the weakened area is less than the thickness of the rest of the relief cavity, facilitating processing and assembly of the battery.

[0022] In some embodiments, the melting point of the material of the weak area is lower than the melting point of the material of the other area of ​​the relief cavity, so that the weak area is more sensitive to temperature than the other area of ​​the relief cavity, and when the pressure reducing mechanism is activated, the weak area is immediately and quickly melted by the effluent discharged from the pressure reducing mechanism, allowing the effluent to be quickly discharged from the outside of the relief cavity, which is favorable for improving the safety performance of the battery.

[0023] In some embodiments, the weakened area includes a through hole, and when the pressure reducing mechanism is activated, the effluent passes through the through hole and is discharged from the relief cavity, so that the through hole disposed in the relief cavity serves as the weakened area, which on the one hand facilitates the processing and assembly of the battery, and on the other hand, when the weakened area is impacted by the effluent discharged from the pressure reducing mechanism, the effluent can be immediately and quickly discharged to the outside of the relief cavity through the through hole, which is favorable to improving the discharge efficiency of the effluent, and thus improving the safety of the battery.

[0024] In some embodiments, the weakened area further includes a sealing structure for sealing the through-hole, the sealing structure being broken upon activation of the pressure reducing mechanism, allowing exhaust from the battery cell to penetrate through the through-hole.

[0025] The sealing structure provided in the embodiment of the present application, on the one hand, can maintain the sealability of the relief cavity during the normal use of the battery cell, and prevent the external environment from affecting the pressure reduction mechanism through the through-hole of the relief cavity, and on the other hand, when the battery cell experiences thermal runaway, the exhaust gas discharged through the pressure reduction mechanism can immediately and smoothly destroy the sealing structure and expose the through-hole, so that the exhaust gas can pass through the through-hole and be discharged to the outside of the relief cavity, thereby improving the safety of the battery.

[0026] In some embodiments, the sealing structure is filled into the through-hole, thereby saving the internal space of the battery and improving the space utilization rate of the battery, while facilitating the processing and assembly of the battery.

[0027] In some embodiments, the sealing structure is installed on an inner surface of the relief cavity corresponding to the through hole, and / or the sealing structure is installed on an outer surface of the relief cavity corresponding to the through hole.

[0028] Thus, when the sealing structure is installed on the inner surface corresponding to the through hole of the relief cavity, the sealing structure is close to the pressure reducing mechanism and is quickly destroyed by the waste discharged through the pressure reducing mechanism, for example, the sealing structure can quickly respond to the temperature of the battery cell, quickly melt the sealing structure, avoid affecting the operation of the pressure reducing mechanism, and can immediately and smoothly discharge the waste. When the sealing structure is installed on the outer surface corresponding to the through hole of the relief cavity, the distance between the sealing structure and the pressure reducing mechanism can provide a deformation space for the operation of the pressure reducing mechanism, avoiding affecting the normal function of the pressure reducing mechanism. In addition, when the sealing structure is simultaneously installed on the inner surface and the outer surface corresponding to the through hole of the relief cavity, the sealing property of the relief cavity can be improved.

[0029] In some embodiments, the relief cavity includes a bottom wall disposed opposite the first wall, and along a second direction, distances between at least two regions of the bottom wall and a first plane in which the first wall is located are different, and the second direction is perpendicular to the first wall.

[0030] In the embodiment of the present application, the distances between different regions of the bottom wall and the first plane along the second direction can be reasonably set according to the amount of the waste accumulated in different regions of the bottom wall of the relief cavity. For example, when the bottom wall of the relief cavity includes a first region and a second region, and the waste from the battery cells collected in the first region is greater than the waste from the battery cells collected in the second region due to the action of gravity when thermal runaway occurs in the battery cells, the bottom wall of the relief cavity can be set so that the distance between the first region and the first plane is greater than the distance between the second region and the first plane, thereby preventing a large amount of waste in the first region from affecting the pressure reduction mechanism corresponding to the first region, and preventing thermal diffusion caused by the waste discharged through the pressure reduction mechanism being accumulated in the relief cavity, which is favorable for improving the safety performance of the battery.

[0031] In some embodiments, in the first direction, a distance between at least a part of the bottom wall and the first plane along the second direction gradually increases, and / or a distance between at least a part of the bottom wall and the first plane along the second direction gradually decreases, so that at least a part of the bottom wall is inclined along the first direction, and the discharged matter discharged through the pressure reducing mechanism is deposited in a specific area of ​​the bottom wall of the relief cavity by the action of gravity, and the distance between the specific area and the first plane is far, i.e., the specific deposition area of ​​the discharged matter on the bottom wall of the relief cavity is controlled to reduce the thermal effect on the battery cell and improve the safety of the battery.

[0032] In some embodiments, in the first direction, from a center of the base wall to an end of the base wall, the distance along the second direction between the base wall and the first plane gradually increases or gradually decreases.

[0033] In the embodiment of the present application, since the size of the end side wall of the relief cavity along the first direction is small, the discharged matter discharged through the pressure reducing mechanism will accumulate more at the end position. Therefore, when the bottom wall of the relief cavity is installed such that the distance between the bottom wall and the first plane along the second direction gradually increases from the center of the bottom wall to the end of the bottom wall along the first direction, since the distance between the end region of the bottom wall and the first plane along the second direction is large, when the battery experiences thermal runaway, the end position of the relief cavity along the first direction has a large space to accommodate the discharged matter discharged through the pressure reducing mechanism, thereby reducing the impact on the pressure reducing mechanism and improving the safety of the battery. Correspondingly, when the bottom wall of the relief cavity is installed such that the distance between the bottom wall and the first plane along the second direction gradually decreases from the center of the bottom wall to both ends of the bottom wall, since the distance between the center region of the bottom wall and the first plane is large, under the influence of gravity, the discharged matter discharged through the pressure reducing mechanism will move to the center region of the bottom wall, thereby reducing the impact on the pressure reducing mechanism and improving the safety of the battery.

[0034] In some embodiments, the bottom wall includes an arcuate surface and / or a flat surface, which facilitates smooth movement of the discharged material discharged through the pressure reducing mechanism over the bottom wall of the relief cavity, while also facilitating processing and assembly of the battery.

[0035] In some embodiments, the bottom wall is provided with a deposition groove having an opening facing the first wall, and along the second direction, a distance between a bottom wall of the deposition groove and the first plane is greater than a distance between an area on the bottom wall other than the deposition groove and the first plane.

[0036] As a result, a sedimentation groove having an opening facing the first wall is provided on the bottom wall of the relief cavity, so that when the pressure reduction mechanism is activated, a sedimentation groove of a certain depth is present on the bottom wall of the relief cavity, and the sedimentation groove has a certain depth and accommodates the discharged material discharged through the pressure reduction mechanism, preventing the discharged material from accumulating in other areas of the bottom wall, reducing the impact on the pressure reduction mechanism, and improving the safety of the battery.

[0037] In some embodiments, the deposition groove is located at an end of the bottom wall along the first direction. In the embodiments of the present application, since the dimension of the end side wall of the relief cavity is small, the high-temperature and high-pressure discharged material discharged through the pressure reducing mechanism is deposited more on the end side wall of the relief cavity, and by locating the deposition groove at the end position of the bottom wall along the first direction, the discharged material can be deposited in the deposition groove, thereby reducing the thermal impact on the pressure reducing mechanism and improving the safety of the battery.

[0038] In some embodiments, the bottom wall is provided with a plurality of the deposition grooves arranged at intervals along the first direction. In the embodiments of the present application, a plurality of deposition grooves can be provided in different regions of the bottom wall according to the amount of effluent accumulated in different regions of the bottom wall of the relief cavity, and the deposition grooves have a certain depth and accommodate the effluent discharged through the pressure reducing mechanism, so that when the battery cell experiences thermal runaway, the deposition grooves are provided in a plurality of regions of the bottom wall of the relief cavity where there is a large amount of effluent, thereby effectively preventing the effluent in the plurality of regions from affecting the corresponding pressure reducing mechanism, and avoiding thermal diffusion caused by the effluent accumulating in the relief cavity, which is favorable for improving the safety of the battery.

[0039] In some embodiments, the battery further includes a collection cavity for collecting exhaust from the battery cells when the pressure reducing mechanism is activated, and the support member is further used to isolate the collection cavity from the electrical cavity. The collection cavity can intensively collect and / or process the exhaust when the pressure reducing mechanism is activated, and can further discharge the exhaust to the outside of the battery. At the same time, the support member can serve as an isolation member to separate the electrical cavity of the battery cells from the collection cavity for collecting the exhaust, avoiding mutual influence between them and preventing at least a part of the exhaust from entering the electrical cavity from the collection cavity, thereby avoiding thermal diffusion.

[0040] In some embodiments, the battery further includes a protective member that is used to surround the support member to form the collection cavity. The protective member and the support member form the collection cavity, which can effectively collect and buffer the exhaust gas discharged through the decompression mechanism, thereby reducing the risk of the exhaust gas discharged. At the same time, the protective member can play a role in protecting the support member, preventing the support member from being destroyed by foreign objects.

[0041] In some embodiments, the support member is at least a part of the wall of the housing, and the support member is used to allow the discharged matter from the battery cell to pass through the support member and be discharged from the housing when the pressure reducing mechanism is activated. In this way, the support member is at least a part of the wall of the housing, and the discharged matter discharged through the pressure reducing mechanism can be directly discharged to the outside of the housing through the support member, thereby saving the space of the battery, improving the space utilization rate of the housing, facilitating the installation of the battery, and improving the processing efficiency of the battery.

[0042] In some embodiments, the support member is a thermal management member used to regulate the temperature of the battery cells, for example, the thermal management member may be used to cool or heat the battery cells, thereby providing a relatively stable temperature for the battery and improving the operating efficiency of the battery.

[0043] According to a second aspect there is provided a power consuming device comprising a battery according to the first aspect adapted to supply electrical energy to the power consuming device.

[0044] In some embodiments, the power consuming device may be a vehicle, a watercraft, or a spacecraft. [Brief description of the drawings]

[0045] In order to more clearly describe the technical solutions in the embodiments of the present application, the following briefly describes the drawings required for the embodiments of the present application, and it should be understood that the drawings shown below are only some embodiments of the present application, and those skilled in the art can further obtain other drawings based on the drawings without creative efforts.

[0046] [Figure 1] 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application. [Diagram 2] 1 is a structural schematic diagram of a battery according to an embodiment of the present application. [Diagram 3] FIG. 1 is a schematic cross-sectional view of a battery according to an embodiment of the present application. [Figure 4] FIG. 2 is a cross-sectional schematic view of a battery according to another embodiment of the present application. [Diagram 5] FIG. 2 is an exploded view of a battery cell according to an embodiment of the present application. [Figure 6] FIG. 1 is a schematic cross-sectional view of a battery according to an embodiment of the present application. [Figure 7] FIG. 7 is an enlarged view of an example of part A of the battery shown in FIG. 6 of the present application. [Figure 8] FIG. 7 is an enlarged view of another example of part A of the battery shown in FIG. 6 of the present application. [Figure 9] FIG. 7 is an enlarged view of yet another example of part A of the battery shown in FIG. 6 of the present application. [Figure 10] FIG. 2 is a structural schematic diagram of an example relief cavity according to an embodiment of the present application. [Figure 11] FIG. 13 is a structural schematic diagram of another example relief cavity according to an embodiment of the present application. [Figure 12] FIG. 13 is a structural schematic diagram of yet another example of a relief cavity according to an embodiment of the present application. [Figure 13] FIG. 13 is a structural schematic diagram of yet another example of a relief cavity according to an embodiment of the present application. [Figure 14] FIG. 2 is a structural schematic diagram of a relief cavity with a deposition groove according to an embodiment of the present application. [Figure 15] FIG. 13 is a structural schematic diagram of a relief cavity with a precipitation groove according to another embodiment of the present application. [Figure 16] FIG. 13 is a structural schematic diagram of a relief cavity with a deposition groove according to yet another embodiment of the present application.

[0047] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] The embodiments of the present application will be described in more detail below with reference to the drawings and examples. The detailed description of the following examples and the drawings are used to exemplarily explain the principles of the present application, but are not intended to limit the scope of the present application, and the present application is not limited to the described examples.

[0049] In the description of this application, unless otherwise stated, "multiple" means two or more, and the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", and "outer" is merely for facilitating and simplifying the description of this application, and does not indicate or imply that the subject device or element has a particular orientation, is configured and should be operated in a particular orientation, and therefore should not be understood as limiting this application. Furthermore, terms such as "first", "second", and "third" are used for explanatory purposes only, and should not be understood as indicating or implying relative importance. "Perpendicular" is not strictly perpendicular, but is within a margin of error. "Parallel" is not strictly parallel, but is within a margin of error.

[0050] Any directional expressions appearing in the following description are the directions shown in the drawings, and do not limit the specific structure of the present application. It should be further explained in the description of the present application that, unless otherwise clearly specified and limited, the terms "attached", "connected" and "connection" should be understood in a broad sense, for example, they may be fixedly connected, detachably connected, or integrally connected. They may be directly connected, or 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 circumstances.

[0051] In the embodiments of the present application, the same reference numerals denote the same components, and in different embodiments, detailed descriptions of the same components will be omitted for the sake of brevity. Note that the dimensions such as thickness, length, width, etc. of each component in the embodiments of the present application and the dimensions such as thickness, length, width, etc. of the entire integrated device are merely illustrative and do not limit the present application in any way.

[0052] 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., and the embodiments of the present application are not limited thereto. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shape, etc., and the embodiments of the present application are not limited thereto. Battery cells are generally divided into three types according to the packaging method, namely, a cylindrical battery cell, a prismatic battery cell, and a soft-pack battery cell, and the embodiments of the present application are not limited thereto.

[0053] The battery referred to in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide 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 liquids or other foreign objects from affecting the charging and discharging of the battery cells.

[0054] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell is mainly operated by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is applied to the surface of the positive electrode collector, the current collector on which the positive electrode active material layer is not applied protrudes from the current collector on which the positive electrode active material layer is applied, and the current collector on which the positive electrode active material layer is not applied is the 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, lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is applied to the surface of the negative electrode current collector, the current collector on which the negative electrode active material layer is not applied protrudes from the current collector on which the negative electrode active material layer is applied, and the current collector on which the negative electrode active material layer is not applied is a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that melting does not occur due to a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator may be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly may be a wound structure or a stacked structure, and the embodiment of the present application is not limited thereto.

[0055] In the development of battery technology, various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge efficiency, must be considered simultaneously, and battery safety must also be taken into consideration.

[0056] For battery cells, the main safety hazard comes from the charging and discharging process. At the same time, in order to take into account the appropriate environmental temperature design and effectively avoid unnecessary losses, battery cells generally have at least three protection measures. Specifically, the protection measures include at least a switching element, an appropriately selected separator material, and a pressure reduction mechanism. The switching element refers to an element that can stop the charging or discharging of the battery when the temperature or resistance inside the battery cell reaches a certain threshold. The separator is used to separate the positive and negative electrode sheets, and when the temperature rises to a certain value, the micrometer-order (or even nano-order) pores attached to it will dissolve by themselves, thereby preventing metal ions from passing through the separator and stopping the internal reaction of the battery cell.

[0057] The pressure reducing mechanism is an element or part that operates to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a certain threshold. The design of the threshold varies according to design requirements. The threshold may depend on one or more materials of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell. The pressure reducing mechanism can take the form of an explosion-proof valve, an air valve, a pressure reducing valve, a safety valve, etc., and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell reaches a certain threshold, the pressure reducing mechanism performs an operation or a fragile structure provided in the pressure reducing mechanism is broken, forming an opening or a flow path that can release the internal pressure or temperature.

[0058] The term "operation" as used herein refers to the pressure reduction mechanism generating an action or being activated to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The action generated by the pressure reduction mechanism includes, but is not limited to, at least a part of the pressure reduction mechanism bursting, fracturing, tearing, opening, etc. When the pressure reduction mechanism is activated, the high temperature and high pressure material inside the battery cell is discharged as an exhaust from the activated point. In this manner, the pressure and temperature can be released from the battery cell under a controllable pressure or temperature condition, and the occurrence of a potential more serious accident can be avoided.

[0059] Exhaust from battery cells referred to in this application includes, but is not limited to, electrolyte, dissolved or split positive and negative electrode sheets, separator fragments, high-temperature and high-pressure gases produced by reactions, flames, etc.

[0060] The pressure reduction mechanism in a battery cell has a significant impact on the safety of the battery. For example, if a phenomenon such as a short circuit or overcharging occurs, thermal runaway may occur inside the battery cell, causing a sudden rise in pressure or temperature. In such a case, the pressure reduction mechanism can be activated to release the internal pressure and temperature to the outside.

[0061] In the normal use of the battery, it is inevitable that the battery will be subjected to the impact of external forces, which will cause some damage to the battery cells and affect the safety performance of the battery. For example, in some application scenarios, the battery is installed in the chassis of an electric vehicle and can provide power to the electric vehicle, but during the running process of the vehicle, it may be adversely affected by shaking, flying stones, etc., which will cause impact and bottom impact on the battery.

[0062] In view of this, the embodiment of the present application provides a battery and a power consumption device. The battery includes a housing, a battery cell module, and a support member, the battery cell module is accommodated in an electrical cavity of the housing, the battery cell module includes a plurality of battery cells arranged along a first direction, and a pressure reducing mechanism is installed in at least two battery cells in the battery cell module, the pressure reducing mechanism is installed in a first wall of the battery cell, the support member is attached to the first wall, the support member includes relief cavities corresponding to the at least two pressure reducing mechanisms in the battery cell module, and the relief cavities are used to provide deformation space for the operation of the at least two pressure reducing mechanisms. Thus, in the embodiment of the present application, the support member is installed in the battery and attached to the first wall of the battery cell, so that the support member can provide a support effect for the battery cell, and the first wall has excellent compressive strength. When an external pressure acts on the battery, the installed support member can prevent most or even all of the external pressure, thereby reducing or eliminating the effect of the external pressure on the battery cell, and improving the pressure resistance and safety performance of the battery. In addition, a pressure reduction mechanism is further installed on the first wall of the battery cell, and relief cavities corresponding to at least two pressure reduction mechanisms in the battery cell module are installed on the support member, so that when the pressure reduction mechanism is operating, the relief cavities of the support member are used to provide a deformation space for the pressure reduction mechanism, thereby preventing the support member from blocking the pressure reduction mechanism, and enabling the waste from the battery cell to be smoothly discharged through the pressure reduction mechanism.

[0063] The technical solutions described in the embodiments of the present application can be applied to various power-consuming devices that use batteries.

[0064] The power consuming device may be a vehicle, a mobile phone, a mobile device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a gasoline vehicle, a natural 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. The spacecraft includes an aircraft, a rocket, a space shuttle, a space ship, etc. The electric toy includes a game console, an electric car toy, an electric ship toy, an electric aircraft toy, and other stationary or mobile electric toys. The electric tool includes an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an electric impact driver, a metal cutting tool such as a concrete vibrator, and an electric planer, a polishing electric tool, an assembly electric tool, and a railway electric tool. The present application does not particularly limit the above power consuming device.

[0065] It should be noted that the technical solutions described in the embodiments of the present application are not only applicable to the above-mentioned power consumption devices, but also to all devices that use batteries. However, for the sake of simplicity, the following embodiments will be described in detail using the power consumption device as an example of a vehicle.

[0066] For example, FIG. 1 shows a structural schematic diagram of a vehicle 1 according to an embodiment of the present application, where the vehicle 1 may be a gasoline vehicle, a natural 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 used to control the battery 10 to power the motor 40. For example, the battery 10 may be installed at the bottom, front, or rear of the vehicle 1. The battery 10 is used to power the vehicle 1, for example, the battery 10 may be used as the operating power source of the vehicle 1 for the circuit system of the vehicle 1, for example, to meet the operating power needs during starting, navigation, and running of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as the operating power source of the vehicle 1, but also as the driving power source of the vehicle 1, to provide driving power to the vehicle 1 by replacing or partially replacing fuel or natural gas.

[0067] In order to meet various power demands, the battery 10 in the embodiment of the present application may be a battery cell module or a battery pack. The battery 10 may include at least one battery cell module, and the battery cell module may include a plurality of battery cells, and the battery 10 is formed by connecting the plurality of battery cells in series, in parallel, or in series-parallel, and the series-parallel connection refers to a mixture of series and parallel connections. The battery 10 may also be called a battery pack. For example, a plurality of battery cells may first be connected in series, in parallel, or in series-parallel to form a battery module, and the plurality of battery modules may be further connected in series, in parallel, or in series-parallel to form the battery 10. That is, a plurality of battery cells may directly form the battery 10, or a battery module may first be formed, and the battery module may then form the battery 10.

[0068] FIG. 2 is a schematic diagram of an exploded structure of battery 10 according to an embodiment of the present application, FIG. 3 is a schematic cross-sectional view of battery 10 according to an embodiment of the present application, and FIG. 4 is a schematic cross-sectional view of another example of battery 10 according to an embodiment of the present application. For example, battery 10 shown in FIGS. 3 and 4 may be a schematic diagram of battery 10 shown in FIG. 2.

[0069] As shown in FIGS. 2 to 4 , the battery 10 of the embodiment of the present application may include a housing 11, a battery cell module 200, and a support member 13, where the housing 11 includes an electrical cavity, the battery cell module 200 is accommodated in the electrical cavity 11a, the battery cell module 200 includes a plurality of battery cells 20 arranged along a first direction X, a pressure reduction mechanism 213 is installed in at least two battery cells 20 in the battery cell module 200, the pressure reduction mechanism 213 is installed in a first wall 25 of the battery cells 20, the support member 13 is attached to the first wall 25 to support the battery cells 20, the support member 13 includes a relief cavity 131 corresponding to the at least two pressure reduction mechanisms 213 in the battery cell module 200, and the relief cavity 131 is used to provide a deformation space for the operation of the at least two pressure reduction mechanisms 213.

[0070] The shape of the battery cell 20 in the embodiment of the present application can be set according to the actual application. For example, the battery cell 20 may have a polyhedral structure, and the polyhedral structure may be surrounded by a plurality of walls, and therefore the battery cell 20 may include a plurality of walls. Here, a pressure reducing mechanism 213 is installed in the first wall 25 of the battery cell 20. The first wall 25 may be any one of the walls of the battery cell 20, for example, the first wall 25 may be the wall of the battery cell 20 with the smallest area. Or, the first wall 25 may be the wall of the battery cell 20 with the largest area, and the embodiment of the present application is not limited thereto.

[0071] It should be noted that 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.

[0072] Alternatively, the shape of the electrical cavity 11a may be determined based on the battery cells 20 to be accommodated. For example, as shown in FIG. 2 or FIG. 3, the electrical cavity 11a may be a hollow rectangular parallelepiped, surrounded by at least six walls, and is easy to process. The electrical cavity 11a of the embodiment of the present application may be formed in various ways. For example, as shown in FIG. 2 and FIG. 3, the housing 11 may include multiple parts having the same or different shapes, and the multiple parts are connected and engaged with each other to form a hollow rectangular parallelepiped, but the embodiment of the present application is not limited thereto.

[0073] It should be noted that the electrical cavity 11a of the embodiment of the present application does not limit the number of battery cells 20 that can be accommodated in it. Furthermore, other members may be installed in the electrical cavity 11a, and for example, a structure for fixing the battery cells 20 in the electrical cavity 11a may be included.

[0074] Furthermore, the electrical cavity 11a in the embodiment of the present application may be used to accommodate the bus members 12, i.e., the electrical cavity 11a provides mounting space for the battery cells 20 and the bus members 12. The bus members 12 are used to realize electrical connections between a plurality of battery cells 20, such as parallel connections, series connections, or series-parallel connections. The bus members 12 can realize electrical connections between the battery cells 20 by connecting the electrode terminals 214 of the battery cells 20. In some embodiments, the bus members 12 may be fixed to the electrode terminals 214 of the battery cells 20 by welding.

[0075] In addition, the material of the support member 13 provided in the embodiment of the present application may be a material with good ductility and high strength, which can buffer and resist external pressure and has high compressive strength. For example, the material of the support member 13 may be a metal material such as copper, aluminum, etc. Or, the material of the support member 13 may be a non-metal material with a certain strength such as mica, ceramic, etc.

[0076] The support member 13 in the embodiment of the present application includes a relief cavity 131, and the relief cavity 131 is used to provide a deformation space for the operation of at least two pressure reduction mechanisms 213. Here, the "deformation space" in the embodiment of the present application refers to a space required in the operating direction (i.e., the direction of destruction) of the inside or outside of the pressure reduction mechanism 213 during the operation process of the pressure reduction mechanism 213 (e.g., when at least a part of the pressure reduction mechanism 213 is destroyed).

[0077] In the embodiment of the present application, the support member 13 is installed on the battery 10, and the support member 13 is attached to the first wall 25 of the battery cell 20, thereby providing a supporting effect for the battery cell 20, so that the first wall 25 has excellent compressive strength. When an external pressure acts on the battery 10, the installed support member 13 can prevent most or even all of the external pressure, thereby reducing or eliminating the effect of the external pressure on the battery cell 20, and improving the pressure resistance and safety performance of the battery 10. In addition, a pressure reducing mechanism 213 is further installed on the first wall 25 of the battery cell 20, and the support member 13 is provided with relief cavities 131 corresponding to at least two pressure reducing mechanisms 213 in the battery cell module 200, so that when the pressure reducing mechanism 213 is operated, the relief cavities 131 of the support member 13 are used to provide a deformation space for the pressure reducing mechanism 213, so as to avoid the support member 13 blocking the pressure reducing mechanism 213, and further allow the exhaust of the battery cell 20 to be smoothly exhausted from the pressure reducing mechanism 213.

[0078] It should be noted that the housing 11 of 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, as shown in FIG. 2-FIG. 3, for the electric cavity 11a, the housing 11 may include a first cover 110 having an opening, and the support member 13 covers the opening of the first cover 110 to form the electric cavity 11a. Thus, the wall for forming the electric cavity 11a includes the first cover 110 and the support member 13. The first cover 110 can be realized in various ways. For example, the first cover 110 may be a hollow one-piece structure with an opening at one end, or the first cover 110 may include a first part 111 and a second part 112 having openings on both opposing sides, and the first part 111 covers the opening on one side of the second part 112 to form the first cover 110 with an opening at one end, and the support member 13 covers the opening on the other side of the second part 112 to form the electric cavity 11a.

[0079] 2 and 3, the housing 11 may include a sealed second cover, which may be used to form the electrical cavity 11a, or the support member 13 may be installed inside the second cover to isolate the electrical cavity 11a and further isolate the collection cavity 11b inside the second cover. The second cover may also be realized in various ways, for example, the second cover may include a third part and a fourth part, one side of the fourth part has an opening to form a semi-sealed structure, the support member 13 is installed inside the fourth part, and the third part covers the opening of the fourth part to form a sealed second cover.

[0080] Specifically, in some embodiments, as shown in Figures 2 and 3, the battery 10 further includes a collection cavity 11b used to collect exhaust from the battery cells 20 when the pressure reducing mechanism 213 is operated, and the support member 13 in the embodiment of the present application is further used to isolate the collection cavity 11b and the electrical cavity 11a. The collection cavity 11b can intensively collect and / or process the exhaust from the battery cells 20 when the pressure reducing mechanism 213 is operated, and can further discharge the exhaust to the outside of the battery 10. At the same time, the support member 13 in the embodiment of the present application can serve as an isolation member to isolate the electrical cavity 11a accommodating the battery cells 20 and the collection cavity 11b collecting the exhaust, thereby avoiding mutual influence between them and preventing at least a part of the exhaust from the collection cavity 11b entering the electrical cavity 11a, thereby avoiding thermal diffusion.

[0081] It should be noted that in the embodiments of the present application, the collection cavity 11b may be sealed or unsealed. In some embodiments, the collection cavity 11b may contain air or other gas. Optionally, a liquid such as a cooling medium may be contained or a liquid member may be placed in the collection cavity 11b to further reduce the temperature of the effluent entering the collection cavity 11b. Further optionally, the gas or liquid in the collection cavity 11b may be placed to circulate and flow.

[0082] In addition, in the embodiment of the present application, the support member 13 may include a wall shared by the electrical cavity 11a and the collecting cavity 11b, and the support member 13 or a part thereof may be used as a wall shared by the electrical cavity 11a and the collecting cavity 11b, thereby shortening the distance between the electrical cavity 11a and the collecting cavity 11b, thereby saving space in the battery 10 and improving the space utilization rate of the housing 11.

[0083] Optionally, in some embodiments, the battery 10 further includes a protective member 113 that is used to surround the support member 13 and form the collection cavity 11b. In the embodiment of the present application, the protective member 113 and the support member 13 form the collection cavity 11b, so that the exhaust gas discharged through the pressure reducing mechanism 213 can be effectively collected and buffered, and the risk of the exhaust gas being discharged can be reduced. At the same time, the protective member 113 can play a role in protecting the support member 13, and prevent the support member 13 from being destroyed by foreign objects.

[0084] Optionally, in some embodiments, the support member 13 in the embodiments of the present application may be a thermal management member 139 used to regulate the temperature of the battery cells 20. For example, the thermal management member 139 may be used to cool or heat the battery cells 20, making the temperature of the battery 10 relatively stable and improving the operating efficiency of the battery 10.

[0085] Specifically, the thermal management member 139 in the embodiment of the present application may contain a fluid or a solid-liquid phase change material to adjust the temperature of the plurality of battery cells 20, or the thermal management member 139 may include a flow path used to accommodate the fluid or the solid-liquid phase change material. The fluid may be liquid or gas, and the solid-liquid phase change material may be originally solid and change to liquid after absorbing heat, and adjusting the temperature refers to heating or cooling the plurality of battery cells 20. When cooling or lowering the temperature of the battery cells 20, the thermal management member 139 is used to accommodate a cooling fluid or a solid-liquid phase change material to lower the temperature of the plurality of battery cells 20, and in this case, the thermal management member 139 may be referred to as a cooling member, a cooling system, a cooling plate, etc., and the accommodated fluid may be referred to as a cooling medium or a cooling fluid, more specifically, as a cooling liquid or a cooling gas. The thermal management member 139 in the embodiment of the present application may also be used to heat the plurality of battery cells 20 to increase the temperature, and the embodiment of the present application is not limited thereto. Optionally, the fluid may be in a circulating flow to achieve a better temperature regulation effect. Optionally, the fluid may be water, a mixture of water and ethylene glycol, or air, etc.

[0086] It should be noted that the embodiment of the present application is not limited to a method of connecting the thermal management member 139 and the battery cell 20. For example, the thermal management member 139 and the battery cell 20 may be fixed to each other by an adhesive.

[0087] Optionally, in some embodiments, different from the above-mentioned installation method, as shown in FIG. 4, the support member 13 in the battery 10 may be at least a part of the wall of the housing 11, and the support member 13 is used for discharging the discharged material from the battery cell 20 through the support member 13 and out of the housing 11 when the pressure reducing mechanism 213 is activated. In the embodiment of the present application, by making the support member 13 at least a part of the wall of the housing 11, the discharged material discharged through the pressure reducing mechanism 213 can be directly discharged to the outside of the housing 11 through the support member 13, which can save the space of the battery 10, improve the space utilization rate of the housing 11, facilitate the installation of the battery 10, and improve the processing efficiency of the battery 10. For example, when thermal runaway occurs in the battery cell 20, the discharged material discharged through the pressure reducing mechanism 213 can be discharged to the outside of the housing 11 by destroying at least a part of the support member 13. Furthermore, a balance valve may be installed on the support member 13, and the balance valve may be destroyed when the pressure reducing mechanism 213 is activated, and waste generated by the battery cells 20 is discharged to the outside of the housing 11 via the balance valve. Note that the above-described method of discharging waste to the outside of the housing 11 is merely an example, and the embodiments of the present application are not limited thereto.

[0088] In the embodiment of the present application, a first pressure reducing mechanism 213 is installed on the first wall 25 of the battery cell 20. FIG. 5 is an exploded structural schematic diagram of the battery cell 20 of the embodiment of the present application. For example, the battery cell 20 shown in FIG. 5 may be any one of the battery cells 20 in the battery 10 shown in FIG. 2 and FIG. 4. As shown in FIG. 5, the battery cell 20 includes an outer case 21, and the outer case 21 may include multiple walls, that is, the outer case 21 is surrounded by multiple walls to form a hollow outer case 21. The outer case 21 may include a housing 211 and a cover plate 212. The wall of the housing 211 and the cover plate 212 are both referred to as the wall of the battery cell 20. The shape of the housing 211 can be determined according to the shape after assembling one or more electrode assemblies 22 therein, for example, the housing 211 may be a hollow rectangular parallelepiped, cube, or cylinder, and at least one surface of the housing 211 has an opening, and one or more electrode assemblies 22 can be disposed in the housing 211. For example, when the housing 211 is a hollow rectangular parallelepiped or cube, at least one plane of the housing 211 is an open surface, i.e., the open surface does not have a wall and communicates between the inside and outside of the housing 211. The housing 211 may be a hollow cylinder, in which case, each of the two end surfaces of the housing 211 may be an open surface, i.e., the end surface does not have a wall and communicates between the inside and outside of the housing 211. At least one cover plate 212 can be installed to cover at least one opening of the housing 211, and each cover plate 212 is connected to the housing 211 to form a sealed cavity in which the electrode assembly 22 is disposed. The housing 211 is filled with an electrolyte, for example, an electrolyte solution.

[0089] In the embodiment of the present application, a pressure reducing mechanism 213 is installed on the first wall 25 of the battery cell 20, and the pressure reducing mechanism 213 is used to operate and release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold value. Alternatively, the first wall 25 may be any one of the walls of the battery cell 20. For example, the first wall 25 may be the wall of the battery cell 20 with the largest area. Furthermore, as shown in FIG. 5, the first wall 25 may be the wall of the battery cell 20 with the smallest area, for example, the first wall 25 may be the bottom wall of the housing 211, which makes it easier to install. For convenience of explanation, the embodiments of the present application are mainly described using the example that the first wall 25 is the bottom wall of the housing 211 of the battery cell 20, and for convenience of illustration, the first wall 25 is separated from the housing 211 in FIG. 5, but this does not limit whether there is an opening on the bottom side of the housing 211; that is, the bottom wall and the side wall of the housing 211 may be of an integral structure, or two independent parts may be connected together.

[0090] Specifically, as shown in FIG. 5, the pressure reduction mechanism 213 may be a part of the first wall 25, or may be a separate structure from the first wall 25 and fixed to the first wall 25 by, for example, welding. When the pressure reduction mechanism 213 is a part of the first wall 25, that is, the pressure reduction mechanism 213 may be integrally formed with the first wall 25, the pressure reduction mechanism 213 may be formed by providing a shallow groove or a concave groove in the first wall 25, and the shallow groove makes the thickness of the region of the first wall 25 where the pressure reduction mechanism 213 is located smaller than the thickness of the other region of the first wall 25 other than the pressure reduction mechanism 213. When the battery cell 20 generates too much gas and the internal pressure of the housing 211 rises and reaches a threshold value, or when the internal reaction of the battery cell 20 generates heat and the internal temperature of the battery cell 20 rises and reaches a threshold value, the battery cell 20 bursts at the shallow groove to communicate the inside and outside of the outer case 21, and the pressure and temperature of the gas are released to the outside by the rupture of the pressure reduction mechanism 213.

[0091] Alternatively, the pressure reduction mechanism 213 of the embodiment of the present application may be various possible pressure reduction structures, and the embodiment of the present application is not limited thereto. For example, the pressure reduction mechanism 213 may be a temperature-sensitive pressure reduction mechanism configured to melt when the internal temperature of the battery cell 20 in which the pressure reduction mechanism 213 is installed reaches a threshold value, and / or the pressure reduction mechanism 213 may be a pressure-sensitive pressure reduction mechanism configured to burst when the internal air pressure of the battery cell 20 in which the pressure reduction mechanism 213 is installed reaches a threshold value.

[0092] Optionally, in one embodiment of the present application, under a situation where the pressure reducing mechanism 213 is installed on the first wall 25 of the battery cell 20, an electrode terminal 214 may be further installed on the outer case 21 of the battery cell 20, and the wall on which the electrode terminal 214 is located may be the same as or different from the first wall 25. For example, as shown in FIG. 5, the embodiment of the present application will be described taking as an example the wall on which the electrode terminal 214 is located different from the first wall 25. For example, the wall on which the electrode terminal 214 is located may be installed opposite the first wall 25, and the first wall 25 may be the bottom wall of the battery cell 20, in which case the wall on which the electrode terminal 214 is located may be the cover plate 212 of the battery cell 20, so that the discharged matter discharged through the pressure reducing mechanism 213 does not affect the electrode terminal 214 of the battery cell 20, thereby avoiding a short circuit and improving the safety of the battery cell 20.

[0093] Specifically, as shown in Fig. 5, the battery cell 20 may include at least two electrode terminals 214, and the at least two electrode terminals 214 may be installed on the same wall or on different walls. Fig. 5 illustrates an example in which the battery cell 20 includes two electrode terminals 214, and the two electrode terminals 214 are installed on a flat cover plate 212. The at least two electrode terminals 214 may include at least one positive electrode terminal 214a and at least one negative electrode terminal 214b.

[0094] The electrode terminals 214 in the embodiment of the present application are electrically connected to the electrode assemblies 22 and used to output electrical energy. For example, each electrode terminal 214 may be provided with a corresponding connecting member 23, which may also be called a current collecting member, and is located between the cover plate 212 and the electrode assemblies 22 and used to electrically connect the electrode assemblies 22 and the electrode terminals 214.

[0095] As shown in FIG. 5, each electrode assembly 22 has a first tab 221 and a second tab 222. The polarities of the first tab 221 and the second tab 222 are opposite. For example, when the first tab 221 is a positive tab, the second tab 222 is a negative tab. The first tab 221 of one or more electrode assemblies 22 is connected to one electrode terminal via one connecting member 23, and the second tab 222 of one or more electrode assemblies 22 is connected to another electrode terminal via another connecting member 23. For example, the positive terminal 214 is connected to the positive tab via one connecting member 23, and the negative terminal 214 is connected to the negative tab via another connecting member 23.

[0096] In the battery cell 20, one or more electrode assemblies 22 can be installed according to actual usage needs. Although FIG. 5 shows that four independent electrode assemblies 22 are installed in the battery cell 20, the embodiment of the present application is not limited thereto.

[0097] Optionally, as shown in Fig. 5, the battery cell 20 may further include a pad 24, which is located between the electrode assembly 22 and the bottom wall of the housing 211 and can play a role in supporting the electrode assembly 22, and can effectively prevent the electrode assembly 22 from interfering with the fillet around the bottom wall of the housing 211. In addition, the pad 24 may have one or more through holes, for example, a plurality of uniformly arranged through holes, or when the pressure reducing mechanism 213 is installed on the bottom wall of the housing 211, a through hole may be installed at a position corresponding to the pressure reducing mechanism 213, thereby facilitating the conduction of liquid or gas, specifically, the spaces on the upper and lower surfaces of the pad 24 can be connected to each other, and both the gas and the electrolyte generated inside the battery cell 20 can freely pass through the pad 24.

[0098] FIG. 6 is a schematic cross-sectional view of another example of the battery 10 of the embodiment of the present application. For example, the battery 10 shown in FIG. 6 may be the battery 10 shown in FIG. 2. For example, the cross section shown in FIG. 6 is perpendicular to the cross sections shown in FIG. 3 and FIG. 4. In the embodiment of the present application, the cross section shown in FIG. 6 may be perpendicular to the third direction Y of the battery 10, and the cross sections shown in FIG. 3 and FIG. 4 may be perpendicular to the first direction X of the battery 10, and the first direction X is perpendicular to the third direction Y. For example, the first direction X or the third direction Y may be the arrangement direction of the multiple battery cells 20 in FIG. 2 or FIG. 6. The first direction X and the third direction Y may further be parallel to the first wall 25, i.e., parallel to the first plane on which the first wall 25 is located.

[0099] 2 to 6, in the embodiment of the present application, the relief opening 132 is provided on the surface of the support member 13 adjacent to the battery cell module 200, at least two pressure reducing mechanisms 213 face the relief opening 132, and the relief cavity 131 communicates with the relief opening 132. Thus, by providing the relief opening 132 on the surface of the support member 13 adjacent to the battery cell module 200, when the pressure reducing mechanism 213 is operated, the discharged material discharged from the pressure reducing mechanism 213 can quickly enter the relief cavity 131 through the relief opening 132, and the discharged material is prevented from accumulating in the electrical cavity 11a, thereby preventing the discharged material from being conducted to the electrical connection member of the electrical cavity 11a and causing a short circuit as much as possible, thereby improving the safety of the battery.

[0100] Optionally, in one embodiment, when the pressure reducing mechanism 213 is operated, the exhaust from the battery cell 20 enters the above-mentioned relief cavity 131 through the relief opening 132 and is discharged from the relief cavity 131. When thermal runaway occurs in the battery cell 20, due to the limited space inside the relief cavity 131, the exhaust discharged through the pressure reducing mechanism 213 is likely to accumulate in the relief cavity 131 and cause thermal impact on the pressure reducing mechanism 213, which causes thermal diffusion between the battery cells 20; however, in the embodiment of the present application, the exhaust quickly enters the relief cavity 131 through the relief opening 132, and the exhaust is discharged to the outside of the relief cavity 131, which is advantageous to avoid thermal diffusion caused by the exhaust being accumulated in the relief cavity 131, thereby improving the safety of the battery 10.

[0101] Optionally, in one embodiment of the present application, the relief cavities 131 and / or the relief openings 132 may be arranged continuously along the first direction X. In this way, by arranging the relief cavities 131 continuously along the first direction X, the relief cavities 131 can correspond to a plurality of pressure reducing mechanisms 213, and / or by arranging the relief openings 132 continuously along the first direction X, the relief openings 132 can correspond to a plurality of pressure reducing mechanisms 213, thereby avoiding a situation where one or more of the pressure reducing mechanisms 213 do not correspond to the relief cavities 131 or do not correspond to the relief openings 132 for the plurality of pressure reducing mechanisms 213 arranged along the first direction X, and thus That is, a situation in which the pressure reduction mechanism 213 between two adjacent relief cavities 131 does not correspond to the relief cavity 131 is avoided, and a situation in which the pressure reduction mechanism 213 between two adjacent relief openings 132 does not correspond to the relief opening is also avoided, and any of the exhaust gases discharged from each of the pressure reduction mechanisms 213 among the multiple pressure reduction mechanisms 213 arranged along the first direction X can enter the relief cavity 131 via the relief openings 132, and at the same time, the structure is simple, making it easy to process and assemble the battery 10.

[0102] In addition, when the pressure reducing mechanism 213 is operating, the discharged matter from the battery cell 20 enters the relief cavity 131 through the relief opening 132, and is discharged from the relief cavity 131 in various ways. For example, by rationally locating the relief cavity 131, it is possible to prevent the discharged matter discharged from the relief cavity 131 from damaging the battery 10, and ensure the safety of the battery 10.

[0103] FIG. 7 is a partial enlarged view of the battery 10 according to the embodiment of the present application, for example, FIG. 7 is an enlarged view of the region A shown in FIG. 6. Optionally, as shown in FIG. 6 and FIG. 7, in one embodiment, the relief cavity 131 according to the embodiment of the present application may be provided with a weak area 133, and the weak area 133 is used for discharging the waste material discharged through the pressure reducing mechanism 213 through the weak area 133 and discharging from the relief cavity 131 when the pressure reducing mechanism 213 is operated. In this way, when the battery cell 20 experiences thermal runaway, the waste material discharged through the pressure reducing mechanism 213 can enter the relief cavity 131 and then be discharged through the weak area 133 of the relief cavity 131, which can not only effectively avoid the thermal diffusion caused by the waste material accumulating in the relief cavity 131, but also realize directional discharge, for example, by rationally setting the position of the weak area 133, the waste material can be discharged from a specific area, and the waste material can be prevented from affecting other components, thereby improving the safety of the battery 10.

[0104] Specifically, in the embodiments of the present application, the fragile area 133 can be realized in various ways. For example, as shown in Fig. 6 and Fig. 7, the fragile area 133 can be broken when the pressure reducing mechanism 213 is operated, and can be used to discharge the discharged material from the relief cavity 131. When the pressure reducing mechanism 213 is not operated, for example, during the normal use of the battery, the relief cavity 131 is in a relatively sealed state, and can effectively protect the relief cavity 131 from being broken by external forces. When the pressure reducing mechanism 213 is operated, the strength of the fragile area 133 on the relief cavity 131 is lower than the strength of the area other than the fragile area 133 on the relief cavity 131, so that the fragile area 133 is easily broken, and the discharged material from the battery cell 20 passes through the fragile area 133 and is discharged from the outside of the relief cavity 131.

[0105] Optionally, in the embodiment of the present application, the relief cavity 131 may include a bottom wall 134 and a side wall 135, the bottom wall 134 is disposed relative to the first wall 25, the side wall 135 is connected to the bottom wall 134 and extends toward the first wall 25, and the weak area 133 is disposed on the bottom wall 134 and / or the side wall 135. When the weak area 133 is disposed on the bottom wall 134 of the relief cavity 131, in a situation where thermal runaway occurs in the battery cell 20, the discharged material discharged through the pressure reducing mechanism 213 is accumulated on the bottom wall 134 under the action of gravity, and can be directly and quickly discharged to the outside of the relief cavity 131 through the weak area 133 of the bottom wall 134 of the relief cavity 131, thereby improving the safety of the battery 10. In addition, in a situation where thermal runaway occurs in the battery cell 20, when the high temperature and high pressure exhaust material discharged through the pressure reducing mechanism 213 enters the relief cavity 131, it is discharged in the direction of the side wall 135 of the relief cavity 131, and due to the blocking action of the side wall 135 of the relief cavity 131, it accumulates in an area close to the side wall 135; therefore, by providing the weak area 133 on the side wall 135 of the relief cavity 131, it is advantageous to immediately discharge the exhaust material, and effectively prevents the exhaust material from accumulating on the side wall 135 of the relief cavity 131.

[0106] In one embodiment, the weak area 133 may be disposed at the end of the bottom wall 134 and / or the side wall 135 along the first direction X. In the embodiment of the present application, as shown in Fig. 6 and Fig. 7, when the thermal runaway occurs in the battery cell 20, due to the blocking effect of the side wall 135 of the relief cavity 131 on the exhaust, the exhaust is generally most heavily deposited at the intersection between the bottom wall 134 and the side wall 135 of the relief cavity 131; at the same time, in some embodiments, due to the poor sealing property of the intersection between the bottom wall 134 and the side wall 135 of the relief cavity 131, an airflow passage is formed at the poor sealing location of the intersection; under the action of the internal and external pressure difference, the airflow generated during the thermal runaway of the battery 10 moves the exhaust to the intersection between the bottom wall 134 and the side wall 135 of the relief cavity 131, and further promotes the exhaust to be deposited at the intersection between the bottom wall 134 and the side wall 135 of the relief cavity 131. In addition, in a situation where a plurality of pressure reduction mechanisms 213 corresponding to the relief cavity 131 are arranged along the first direction X, the two side walls relatively installed along the first direction X of the relief cavity 131 are smaller in size than the other walls, so that the waste material discharged through the pressure reduction mechanisms 213 accumulates most at the ends along the first direction of the bottom wall 134 and / or the side wall 135 of the relief cavity 131, which has a significant impact on the pressure reduction mechanisms 213 and is likely to cause thermal diffusion of the battery cell 20. By locating the weak area 133 at the ends along the first direction X of the bottom wall 134 and / or the side wall 135, it is possible to effectively avoid thermal diffusion caused by the waste material accumulating in the relief cavity 131, thereby improving the safety of the battery 10.

[0107] Optionally, in the present embodiment, the weakened area 133 satisfies the following:

number

[0108] Specifically, if the value of d / E is set too large, the minimum thickness d of the weak area 133 of the relief cavity 131 may be set relatively large, and the volumetric energy density E of the battery cell 20 may be set relatively small. As a result, if the temperature or pressure of the discharged material discharged when thermal runaway occurs in the battery cell 20 is low and the minimum thickness d of the weak area 133 of the relief cavity 131 is set too large, the discharged material may destroy the relief cavity 131 and it may be difficult to immediately discharge the discharged material, or it may take too long to destroy the relief cavity 131, and ultimately the discharged material may be restricted within the relief cavity 131 under the pressure reducing mechanism 213, and the space of the relief cavity 131 may be limited, and the accumulated discharged material may adversely affect the corresponding battery cell 20, which may easily cause the thermal diffusion phenomenon between the battery cells 20. Therefore, it is not preferable to set the value of d / E too large.

[0109] Conversely, it is also undesirable to set the value of d / E too small. Due to structural constraints of the battery cell 20 itself, there is an upper limit to the volumetric energy density E of the battery cell 20. Therefore, if the value of d / E is set too small, that is, in a situation where the volumetric energy density E of the battery 10 is constant, the minimum thickness d of the weak area 133 of the relief cavity 131 becomes small, the structural strength of the relief cavity 131 becomes insufficient, and breakage is likely to occur under conditions of normal use of the battery 10, the sealing performance of the relief cavity 131 decreases, and the safety of the battery 10 also decreases.

[0110] Therefore, it is not preferable for the value of d / E in the embodiments of the present application to be set too large or too small. For example, the value of d / E may be set to the following numerical value, or the numerical value may be set within a range obtained by a combination of any two of the following numerical values:

number

[0111] For further example, the weakened area 133 in the present embodiment further satisfies the following:

number

[0112] In the embodiment of the present application, it is not preferable to set the volume energy density E of the battery cell 20 too large or too small, and the volume energy density E of the battery cell 20 can be set according to the actual application. For example, the range of the volume energy density of the battery cell 20 is [500Wh / L, 1000Wh / L]. If the volume energy density E of the battery cell 20 is set too small, the energy demand of the battery 10 cannot be met, and if the volume energy density E of the battery cell 20 is set too large, the processing difficulty of the battery cell 20 is increased and it is difficult to realize. Therefore, the volume energy density E of the battery cell 20 may be set to 500Wh / L, 550Wh / L, 600Wh / L, 650Wh / L, 700Wh / L, 750Wh / L, 800Wh / L, 850Wh / L, 900Wh / L, 950Wh / L, or 1000Wh / L, or the value may be set within a range obtained by a combination of any two of the above values.

[0113] Specifically, in one embodiment, in the situation of different minimum thicknesses d of the weakened area 133 in the battery 10 and different volumetric energy densities E, the performance test results of the weakened area 133 under the same experimental conditions are as shown in Table 1.

[0114] [Table 1]

[0115] As shown in Table 1 above, the data in the first column indicate the values ​​of the minimum thickness d of the weak area 133 in the different examples and the comparative example. The data in the second column indicate the values ​​of the volumetric energy density E of the battery cell 20 in the different examples and the comparative example. The data in the third column indicate the ratio of the minimum thickness d of the weak area 133 to the volumetric energy density E of the battery cell 20 in the different examples and the comparative example. The fourth column indicates the performance test results under experimental conditions simulating vibration and impact on the weak area 133 in the different examples and the comparative example, where the vibration and impact simulates the action of an external force that the battery 10 may receive during normal use, and the test results include a situation in which the weak area 133 is not destroyed and a situation in which the weak area 133 is destroyed. The fifth column indicates the performance test results under experimental conditions simulating the occurrence of thermal runaway in the battery cell 20 in the weak area 133 in the different examples and the comparative example, where the test results include a situation in which the weak area 133 is destroyed by the effluent discharged through the decompression mechanism 213 and a situation in which the weak area 133 is not destroyed by the effluent discharged from the decompression mechanism 213.

[0116] The ranges of d / E values ​​in Examples 1 to 9 are as follows:

number

[0117] As shown in Table 1 above, the values ​​of d / E in Comparative Examples 1 to 3 are as follows:

number

number

[0118] Optionally, in the present embodiment, the weakened area 133 satisfies the following:

number

[0119] Specifically, when the value of T1 / E is too small, there is an upper limit to the volumetric energy density E of the battery cell due to the structural constraints of the battery cell 20 itself. That is, under the condition that the volumetric energy density E of the battery cell 20 is constant, the value of the melting point T1 of the material of the weak area 133 of the relief cavity 131 becomes small, which increases the difficulty of material selection on the one hand, and also makes the structural strength of the relief cavity 131 insufficient on the other hand. In the normal use state of the battery 10, for example, during the charging and discharging process, there may be a situation in which the temperature of the battery 10 rises, and the weak area 133 of the relief cavity 131 is easily softened or melted in the normal use state of the battery 10, which reduces the sealing property of the relief cavity 131 and also reduces the safety of the battery 10.

[0120] On the other hand, if the value of T1 / E is too large, that is, the melting point T1 of the material of the weak area 133 of the relief cavity 131 is set relatively high and the volumetric energy density E of the battery cell 20 is set relatively small, correspondingly, when thermal runaway occurs in the battery cell 20, the temperature of the exhaust material discharged through the pressure reduction mechanism 213 is low, and the melting point T1 of the material of the weak area 133 of the relief cavity 131 is set too high, the exhaust material will melt the weak area 133 of the relief cavity 131 and it will be difficult to immediately discharge the exhaust material, or it will take too long to melt the weak area 133 of the relief cavity 131, and the exhaust material will be restricted within the relief cavity 131 corresponding to the pressure reduction mechanism 213, and the space of the relief cavity 131 will be limited, causing a thermal effect on the pressure reduction mechanism 213, which is likely to cause the thermal diffusion phenomenon between the battery cells 20.

[0121] Therefore, it is not preferable to set the value of T1 / E in the embodiments of the present application too large or too small. For example, the value of T1 / E may be set to the following value, or the value may be set within a range obtained by combining any two of the following values:

number

[0122] In the embodiment of the present application, it is not preferable to set the melting point T1 of the material of the weak region 133 too high or too low. For example, the value range of the melting point T1 of the material of the weak region 133 is [100°C, 600°C]. For example, the value range of the melting point T1 of the material of the weak region 133 may be set to [100°C, 400°C], so that even if thermal runaway occurs in the battery cell 20, it takes a short time for the generated waste to destroy the weak region 133. If the melting point T1 of the material of the weak region 133 is set too low, the weak region 133 may soften or melt under normal use conditions of the battery, affecting the sealing of the relief cavity 131. If the melting point T1 of the material of the weak region 133 is set too high, when thermal runaway occurs in the battery cell 20, the generated waste may not melt the weak region 133 easily or the waste may take too long to melt the weak region 133, which may cause thermal diffusion in the battery 10. Thus, the melting point T1 of the material of the weakened region 133 may be set to 100°C, 200°C, 300°C, 400°C, 500°C or 600°C, or the value may be set within a range obtained by a combination of any two of the above values.

[0123] The range of values ​​of the volumetric energy density E of the battery cell 20 in the embodiment of the present application has already been described in detail above, and therefore will not be described here to avoid duplication.

[0124] Specifically, in one embodiment, the battery 10 has different melting points T1 of the materials of the weakened region 133 and different volumetric energy densities E, and the performance test results of the weakened region 133 under the same experimental conditions are shown in Table 2.

[0125] [Table 2]

[0126] As shown in Table 2 above, the data in the first column shows the melting point T1 values ​​of the material of the weak region 133 in the different examples and comparative examples. The data in the second column shows the values ​​of the volumetric energy density E of the battery cell 20 in the different examples and comparative examples. The data in the third column shows the ratio of the melting point T1 of the weak region 133 to the volumetric energy density E of the battery cell 20 in the different examples and comparative examples. The data in the fourth column shows the performance test results under experimental conditions simulating vibration and impact on the weak region 133 in the different examples and comparative examples, where the vibration and impact simulates the action of an external force that the battery 10 may be subjected to during normal use, and the test results include a situation where the weak region 133 is not destroyed and a situation where the weak region 133 is destroyed (melting or softening phenomenon occurs). The fifth column shows performance test results under experimental conditions simulating the occurrence of thermal runaway in battery cells 20 in weak areas 133 of different embodiments and comparative examples, and the test results include a situation in which the weak area 133 is destroyed by the emissions discharged through the pressure reduction mechanism 213 and a situation in which the weak area 133 is not destroyed by the emissions discharged from the pressure reduction mechanism 213.

[0127] The ranges of the T1 / E values ​​in Examples 1 to 9 are as follows.

number

[0128] As shown in Table 2 above, the values ​​of T1 / E in Comparative Examples 1 to 3 are as follows:

number

number

[0129] Optionally, in the embodiment of the present application, the implementation method of the weak area 133 of the relief cavity 131 can be flexibly set according to actual applications. For example, the thickness of the weak area 133 can be set smaller than the thickness of the area of ​​the relief cavity 131 other than the weak area 133, so that the battery 10 can be easily processed and assembled. For example, when the weak area 133 is installed on the side wall 135 along the first direction of the relief cavity 131, the impact force of the external environment that the bottom wall 134 of the relief cavity 131 receives during the use of the battery 10 is generally larger than that of the side wall 135 of the relief cavity 131, and in order to ensure the structural strength of the relief cavity 131, the thickness of the bottom wall 134 of the relief cavity 131 may be set to be larger than the thickness of the weak area 133 of the side wall 135. Correspondingly, in order to ensure that the discharged material immediately and smoothly breaks through the weak area 133 under the condition that thermal runaway occurs in the battery cell 20, the minimum thickness D of the bottom wall 134 of the relief cavity 131 may satisfy d≦(D−0.2 mm).

[0130] Optionally, in the embodiment of the present application, the melting point of the material of the weak area 133 can be set to be lower than the melting point of the material of the area other than the weak area 133 in the relief cavity 131. As a result, the weak area 133 is more sensitive to temperature than the area other than the weak area 133 in the relief cavity 131, and when the pressure reduction mechanism 213 is operated, the weak area 133 is immediately and quickly melted by the effluent discharged from the pressure reduction mechanism 213, and the effluent can be quickly discharged from the outside of the relief cavity 131, which is advantageous to improving the safety performance of the battery 10. For example, when the weak area 133 is installed on the side wall 135 along the first direction X of the relief cavity 131, in a situation where thermal runaway occurs in the battery cell 20, the bottom wall 134 of the relief cavity 131 will receive a greater thermal shock than the side wall 135 of the relief cavity 131. Therefore, in order to ensure that the discharged matter discharged through the pressure reducing mechanism 213 quickly melts the material of the weak area 133 on the side wall 135 of the relief cavity 131, the melting point of the material of the bottom wall 134 of the relief cavity 131 should be set higher than the melting point of the material of the weak area 133 of the side wall 135.

[0131] It should be noted that the above-mentioned methods for providing the weakened area 133 in the embodiment of the present application may be used alone or in combination. For example, the weakened area 133 in the embodiment of the present application may be improved by a combined solution of lowering the melting point of the material of the weakened area 133 and reducing the thickness of the weakened area 133 at the same time, and the embodiment of the present application is not limited thereto.

[0132] 8 and 9 are partial enlarged views of the battery 10 according to an embodiment of the present application, and for example, FIGS. 8 and 9 may be enlarged views of the region A of the battery 10 shown in FIG. 6. As shown in FIGS. 8 and 9, the weak area of ​​the relief cavity 131 includes a through hole 136, and when the pressure reducing mechanism 213 is operated, the effluent discharged through the pressure reducing mechanism 213 may pass through the through hole 136 and be discharged from the relief cavity 131. In the embodiment of the present application, the through hole 136 provided in the relief cavity 131 is used as the weak area 133, which on the one hand facilitates the processing and assembly of the battery 10, and on the other hand, when the weak area 133 is impacted by the effluent discharged from the pressure reducing mechanism 213, the effluent can be immediately and quickly discharged to the outside of the relief cavity 131 through the through hole 136, which is favorable to improving the discharge efficiency of the effluent, and thus improving the safety of the battery 10.

[0133] Optionally, as an embodiment, as shown in FIG. 8 and FIG. 9, the weak area 133 of the relief cavity 131 in the embodiment of the present application further includes a sealing structure 137 for sealing the through hole 136, and the sealing structure 137 is broken when the pressure reducing mechanism 213 is activated, so that the exhaust of the battery cell 20 can pass through the through hole 136. The sealing structure 137 installed in the embodiment of the present application can, on the one hand, maintain the sealability of the relief cavity 131 during the normal use of the battery cell 20, and prevent the external environment from affecting the pressure reducing mechanism 213 through the through hole 136 of the relief cavity 131. On the other hand, when the battery cell 20 experiences thermal runaway, the exhaust discharged through the pressure reducing mechanism 213 can immediately and smoothly break the sealing structure 137, exposing the through hole 136, so that the exhaust can pass through the through hole 136 and be discharged to the outside of the relief cavity 131, thereby improving the safety of the battery 10.

[0134] Optionally, in some embodiments, as shown in FIG. 8 , the sealing structure 137 in the embodiments of the present application may be filled into the through-hole 136, thereby saving the internal space of the battery 10, improving the space utilization rate of the battery 10, and at the same time facilitating the processing and assembly of the battery 10.

[0135] Optionally, in some embodiments, as shown in Fig. 9, the sealing structure 137 in the embodiments of the present application may be installed on an inner surface corresponding to the through hole 136 of the relief cavity 131, and / or the sealing structure 137 may be installed on an outer surface corresponding to the through hole 136 of the relief cavity 131. In the embodiments of the present application, when the sealing structure 137 is installed on the inner surface corresponding to the through hole 136 of the relief cavity 131, the sealing structure 137 is close to the pressure reducing mechanism 213, so that it is quickly destroyed by the exhaust discharged from the pressure reducing mechanism 213. For example, the sealing structure 137 can quickly respond to the temperature of the battery cell 20, quickly melt the sealing structure 137, avoiding affecting the operation of the pressure reducing mechanism 213, and can quickly and smoothly discharge the exhaust. When the sealing structure 137 is installed on the outer surface corresponding to the through hole 136 of the relief cavity 131, the distance between the sealing structure 137 and the pressure reduction mechanism 213 can provide a deformation space for the operation of the pressure reduction mechanism 213, and avoid affecting the normal function of the pressure reduction mechanism 213. In addition, when the sealing structure 137 is simultaneously installed on the inner surface and the outer surface corresponding to the through hole 136 of the relief cavity 131, the sealing ability of the relief cavity 131 can be improved.

[0136] For example, as shown in FIG. 9, the sealing structure 137 in the embodiment of the present application may be installed simultaneously on the inner and outer surfaces corresponding to the through hole 136 of the relief cavity 131, but this is an example and the embodiment of the present application is not limited thereto.

[0137] As shown in FIG. 9 , the inner surface corresponding to the through hole 136 in the embodiment of the present application is a surface that faces toward the inside of the escape cavity 131 along the first direction X of the escape cavity 131 corresponding to the through hole 136, and the outer surface corresponding to the through hole 136 is a surface that faces away from the inside of the escape cavity 131 along the first direction X of the escape cavity 131 corresponding to the through hole 136.

[0138] The material of the sealing structure 137 in the embodiment of the present application can be set according to the actual application. For example, the sealing structure 137 in the embodiment of the present application may include polypropylene (PP) having a melting point of about 190° C., soluble polytetrafluoroethylene (polyfluroroalkoxy, PFA) having a melting point of about 300° C., polyimide (PI) having a melting point of about 350° C., silicone rubber (melting point is about 350° C.), fluorine rubber (melting point is about 400° C.), or tin (melting point is about 232° C.). In addition, the material of the weak area 133 of the relief cavity 131 or the area other than the sealing structure 137 in the embodiment of the present application may be an aluminum alloy (melting point is about 660° C.), but this is an example and the embodiment of the present application is not limited thereto.

[0139] In addition, the sealing structure 137 in the embodiment of the present application may be filled in the through hole 136 in a form of being fitted via an adhesive, or the sealing structure 137 may be fixed via an adhesive to an inner surface corresponding to the through hole 136 of the relief cavity 131 and / or to an outer surface corresponding to the through hole 136 of the relief cavity 131. Exemplarily, the material of the adhesive in the embodiment of the present application may include an epoxy-based structural adhesive, an acrylate structural adhesive, a polyimide structural adhesive, a maleimide structural adhesive, a polyurethane structural adhesive, or an acrylic adhesive, but this is merely an example and the embodiment of the present application is not limited thereto.

[0140] A method of installing the bottom wall 134 of the relief cavity 131 in an embodiment of the present application will be described in detail below with reference to the drawings. Fig. 10 to Fig. 13 are schematic cross-sectional views of the battery 10 in the embodiment of the present application, and the battery 10 shown in Fig. 10 to Fig. 13 may be the battery 10 shown in Fig. 2, and the cross sections shown in Fig. 10 to Fig. 13 are all cross sections perpendicular to the third direction Y of the battery 10, and for example, the cross sections shown in Fig. 10 to Fig. 13 are perpendicular to the cross section shown in Fig. 3 or Fig. 4, and the cross sections shown in Fig. 10 to Fig. 13 are parallel to the cross section shown in Fig. 6.

[0141] Optionally, as an embodiment, the relief cavity 131 of the embodiment of the present application includes a bottom wall 134 that is disposed relative to the first wall 25, and along the second direction Z, the distances between at least two regions of the bottom wall 134 and the first plane on which the first wall 25 is located are different, and the second direction Z is perpendicular to the first wall 25. In the embodiment of the present application, the distances along the second direction Z between the different regions of the bottom wall 134 and the first plane can be reasonably set according to the amount of waste accumulated in different regions of the bottom wall 134 of the relief cavity 131. For example, when the bottom wall 134 of the release cavity 131 includes a first region and a second region, and thermal runaway occurs in the battery cell 20, if the amount of waste from the battery cell 20 collected in the first region is greater than the amount of waste from the battery cell 20 collected in the second region due to the action of gravity, the bottom wall 134 of the release cavity 131 can be set so that the distance between the first region and the first plane is greater than the distance between the second region and the first plane, thereby preventing a large amount of waste in the first region from affecting the pressure reduction mechanism 213 corresponding to the first region, and preventing thermal diffusion caused by the waste discharged through the pressure reduction mechanism 213 accumulating in the release cavity 131, which is advantageous for improving the safety performance of the battery 10.

[0142] The second direction Z in the embodiment of the present application is perpendicular to the first wall 25, i.e., perpendicular to the first plane in which the first wall 25 is located. For example, the second direction Z may also be perpendicular to the first direction X. Further, for example, the second direction Z may also be a height direction of the battery cell 20.

[0143] The at least two regions of the bottom wall 134 in the embodiment of the present application may refer to any region of the bottom wall 134 of the relief cavity 131. For example, taking the first region and the second region included in the bottom wall 134 of the relief cavity 131 as an example, the first region and the second region may be any two non-overlapping regions of the bottom wall 134. The areas of the first region and the second region on the bottom wall 134 may be the same or different. The distance between the first region and the first plane in the embodiment of the present application along the second direction Z may be the average value, maximum value, or minimum value of the distance between all points on the first region and the first plane, and correspondingly, the distance between the second region and the first plane in the embodiment of the present application along the second direction Z may also be the average value, maximum value, or minimum value of the distance between all points on the second region and the first plane. For example, the distance along the second direction Z between the first region and the first plane may be the minimum value of the distances between all points on the first region and the first plane, and at the same time, the distance along the second direction Z between the second region and the first plane may also be the minimum value of the distances between all points on the second region and the first plane, and the minimum value corresponding to the first region and the minimum value corresponding to the second region are different, and for the sake of simplicity, the explanation will be omitted here.

[0144] Optionally, as an example, in the first direction X, a distance along the second direction Z between at least a portion of the region of the bottom wall 134 and the first plane gradually increases, and / or a distance along the second direction Z between at least a portion of the region of the bottom wall 134 and the first plane gradually decreases, in the first direction X. As shown in Figs. 10 to 13, at least a portion of the region of the bottom wall 134 satisfies the requirement that the portion of the region is inclined with respect to the first plane in the first direction X. As a result, since at least a portion of the area of ​​the bottom wall 134 is inclined along the first direction X, the action of gravity can cause the emissions discharged through the pressure reduction mechanism 213 to accumulate in a specific area of ​​the bottom wall 134 of the escape cavity 131. For example, based on the inclination direction of the inclined area of ​​the bottom wall 134, the emissions are concentrated and accumulated in an area away from the first plane along the second direction Z of the bottom wall 134, and the distance between the specific area and the first plane is also far. In other words, by controlling the specific accumulation area on the bottom wall 134 of the escape cavity 131 for the emissions, the thermal impact on the battery cell 20 is reduced and the safety of the battery 10 is improved.

[0145] Optionally, as an embodiment, in the first direction X, the distance between the bottom wall 134 and the first plane along the second direction Z gradually increases or gradually decreases from the center of the bottom wall 134 toward the end of the bottom wall 134. In the embodiment of the present application, as shown in Figures 10 and 11, in the first direction X, the distance between the area close to the center of the bottom wall 134 of the relief cavity 131 and the first plane is indicated by L1, and the distance between the area away from the center of the bottom wall 134 of the relief cavity 131 and the first plane is indicated by L2, where L1 is smaller than L2. Therefore, under the action of gravity, the discharge on the bottom wall 134 is deposited at a location away from the center of the bottom wall 134 of the relief cavity 131. In addition, since the size of the sidewall of the end of the relief cavity 131 along the first direction X is small, the discharged material discharged through the pressure reducing mechanism 213 accumulates more at the end position of the relief cavity 131 along the first direction X. Therefore, when the bottom wall 134 of the relief cavity 131 is installed such that the distance between the bottom wall 134 and the first plane along the second direction Z gradually increases from the center of the bottom wall toward the end of the bottom wall 134 along the first direction, since the distance between the end region of the bottom wall 134 along the first direction X and the first plane along the second direction Z is large, in a situation where thermal runaway occurs in the battery 10, the discharged material accumulates more at the end position of the relief cavity 131 along the first direction X, but there is a large space for accommodating the discharged material discharged from the pressure reducing mechanism 213, thereby reducing the impact on the pressure reducing mechanism 213 and improving the safety of the battery 10.

[0146] 12 and 13, in the first direction X, from the center of the bottom wall 134 toward the end of the bottom wall 134, the distance between the area close to the center of the bottom wall 134 of the relief cavity 131 and the first plane is indicated by L3, and the distance between the area away from the center of the bottom wall 134 of the relief cavity 131 and the first plane is indicated by L4, where L3 is smaller than L4. Therefore, under the action of gravity, the discharged matter on the bottom wall 134 is deposited at a location far away from the center of the bottom wall 134 of the relief cavity 131. In addition, since the size of the side wall at the end of the relief cavity 131 along the first direction X is small, the discharged matter discharged through the pressure reducing mechanism 213 is deposited more at the end position of the relief cavity 131 along the first direction X. Therefore, when the bottom wall 134 of the relief cavity 131 is disposed such that the distance in the second direction Z between the bottom wall 134 and the first plane gradually decreases from the center of the bottom wall toward the end of the bottom wall 134 along the first direction X, the distance in the second direction Z between the central region of the bottom wall 134 along the first direction X and the first plane is large, so that in a situation where thermal runaway occurs in the battery 10, the discharged material at the end position in the first direction X of the relief cavity 131 can pass through the slope of the bottom wall 134 and move to the center of the bottom wall 134, thereby reducing the impact on the pressure reduction mechanism 213 and improving the safety of the battery 10.

[0147] In addition, in the embodiment of the present application, the bottom wall 134 may be configured as an arcuate surface and / or a flat surface, which makes it easier for the discharged material discharged through the pressure reducing mechanism 213 to move smoothly on the bottom wall 134 of the relief cavity 131, and at the same time makes it easier to process and assemble the battery 10.

[0148] Optionally, as one embodiment, a bottom wall 134, which is installed relative to the first wall 25 of the escape cavity 131 in the embodiment of the present application, may be provided with a deposition groove 138 with an opening facing the first wall 25, and along the second direction Z, the distance between the groove bottom wall of the deposition groove 138 and the first plane on which the first wall 25 is located is greater than the distance between the area of ​​the bottom wall 134 other than the deposition groove 138 and the first plane, and the second direction Z is perpendicular to the first direction X. In the embodiment of the present application, a sedimentation groove 138 with an opening facing the first wall 25 is provided on the bottom wall 134 of the relief cavity 131. Therefore, when the pressure reduction mechanism 213 is operated, a sedimentation groove of a certain depth exists on the bottom wall 134 of the relief cavity 131. Therefore, the sedimentation groove 138 has a certain depth and can accommodate the waste discharged through the pressure reduction mechanism 213, thereby preventing the waste from accumulating in other areas of the bottom wall 134, reducing the impact on the pressure reduction mechanism 213, and improving the safety of the battery 10.

[0149] Hereinafter, a method for providing the deposition groove 138 on the bottom wall 134 of the relief cavity 131 in an embodiment of the present application will be described in detail with reference to the drawings. Fig. 14 to Fig. 16 are schematic cross-sectional views of the battery 10 according to the embodiment of the present application, and the battery 10 shown in Fig. 14 to Fig. 16 may be the battery 10 shown in Fig. 2, and the cross sections shown in Fig. 14 to Fig. 16 are all cross-sectional views perpendicular to the third direction Y of the battery 10, for example, the cross sections shown in Fig. 14 to Fig. 16 are perpendicular to the cross section shown in Fig. 3 or Fig. 4, and the cross sections shown in Fig. 14 to Fig. 16 are parallel to the cross section shown in Fig. 6 and parallel to the cross sections shown in Figs. 10 to 13.

[0150] 14 to 16, one or more sedimentation grooves 138 are provided in the bottom wall 134 of the embodiment of the present application, and for any one of the sedimentation grooves 138, the depth H1 of the sedimentation groove 138 is greater than the depth H2 of the area of ​​the bottom wall 134 other than the sedimentation groove 138. The depth H1 of the sedimentation groove 138 is the distance along the second direction Z between the bottom wall of the sedimentation groove 138 and the first wall 25, and the depth H2 of the area of ​​the bottom wall 134 other than the sedimentation groove 138 is the distance along the second direction Z between the area and the first wall 25.

[0151] In addition, the depth H1 of the sedimentation groove 138 in the embodiments of the present application may be the average, maximum or minimum value of the distance between all points on the bottom wall of the sedimentation groove 138 and the first plane on which the first wall 25 is located, and correspondingly, the depth H2 of the area of ​​the bottom wall 134 other than the sedimentation groove 138 may be the average, maximum or minimum value of the distance between all points on the area of ​​the bottom wall 134 other than the sedimentation groove 138 and the first plane on which the first wall 25 is located. For example, the distance along the second direction Z between the bottom wall of the deposition groove 138 and the first plane may be the minimum value of the distance between all points on the bottom wall of the deposition groove 138 and the first plane, and at the same time, the distance along the second direction Z between the area of ​​the bottom wall 134 other than the deposition groove 138 and the first plane may also be the minimum value of the distance between all points on the area of ​​the bottom wall 134 other than the deposition groove 138 and the first plane, and the minimum value corresponding to the bottom wall of the deposition groove 138 is greater than the minimum value corresponding to the area of ​​the bottom wall 134 other than the deposition groove 138, but the embodiments of the present application are not limited thereto.

[0152] Optionally, in some embodiments, as shown in Fig. 14 and Fig. 15, the sedimentation groove 138 on the bottom wall 134 of the relief cavity 131 is located at the end of the bottom wall 134 along the first direction X. In the embodiments of the present application, since the size of the sidewall of the end of the relief cavity 131 along the first direction X is small, the high-temperature and high-pressure discharged material discharged through the pressure reducing mechanism 213 is deposited more at the sidewall of the end of the relief cavity 131 along the first direction X. The sedimentation groove 138 is disposed at the end of the bottom wall 134 of the relief cavity 131 along the first direction X, on the one hand, the sedimentation groove 138 can accommodate the discharged material, and most of the discharged material is deposited in the sedimentation groove 138, and on the other hand, since the depth of the sedimentation groove 138 is deep, the thermal effect of the discharged material on the battery cell 20 can be reduced, the occurrence of thermal diffusion can be avoided, and the safety of the battery 10 can be improved.

[0153] Optionally, in some embodiments, as shown in Figures 15 and 16, a plurality of deposition grooves 138 arranged at intervals along the first direction X may be provided in the bottom wall 134 of the relief cavity 131 in the embodiments of the present application. In the embodiment of the present application, according to the amount of the waste accumulated in different regions of the bottom wall 134 of the relief cavity 131, a number of deposition grooves 138 can be provided in different regions of the bottom wall 134. The deposition grooves 138 have a certain depth and can accommodate the waste discharged through the pressure reducing mechanism 213. Since the deposition grooves 138 are deep, when the thermal runaway occurs in the battery cell 20, the deposition grooves 138 can be provided in a number of specific regions of the bottom wall 134 of the relief cavity 131 where the waste is large, thereby effectively avoiding the impact of the waste in the multiple specific regions on the corresponding pressure reducing mechanisms 213. This avoids the thermal diffusion caused by the waste accumulating in the relief cavity 131, that is, by controlling the waste to be in a specific deposition groove 138 on the bottom wall 134 of the relief cavity 131, the thermal impact on the battery cell 20 can be reduced, which is beneficial to improving the safety of the battery 10.

[0154] For example, as shown in FIG. 16 , the bottom wall 134 of the relief cavity 131 in the embodiment of the present application may further be provided with a plurality of deposition grooves 138 arranged at intervals along the first direction X, and the plurality of deposition grooves 138 correspond one-to-one to the pressure reduction mechanisms 213 of the plurality of battery cells 20. Thus, when the pressure reduction mechanism 213 of each battery cell 20 is operated, the discharged material discharged through the pressure reduction mechanism 213 of the battery cell 20 can be deposited in the corresponding deposition groove 138, thereby avoiding the thermal influence on other battery cells 20, avoiding the occurrence of thermal diffusion, and improving the safety of the battery 10.

[0155] Optionally, the depths of the plurality of sedimentation grooves 138 arranged at intervals along the first direction X of the bottom wall 134 in the embodiment of the present application may be the same or different. For example, as shown in Figures 14 to 16, when the depths of the plurality of sedimentation grooves 138 are set to be the same, processing and installation of the battery 10 may be facilitated. Furthermore, for example, unlike what is shown in Figures 14 to 16, the depths of the plurality of sedimentation grooves 138 may be set based on the amount of waste accumulated in different regions on the bottom wall 134, i.e., the depths of the plurality of sedimentation grooves 138 may not be equal. For example, since the size of the sidewall of the end of the relief cavity 131 along the first direction X is small, the high-temperature and high-pressure discharged material discharged through the pressure reducing mechanism 213 accumulates more at the sidewall portion of the end of the relief cavity 131 along the first direction X, and therefore a deep sedimentation groove 138 is provided at a portion close to the end of the relief cavity 131 along the first direction X, and a shallow sedimentation groove 138 is provided at a portion close to the center position of the bottom wall 134 of the relief cavity 131.

[0156] In the embodiment of the present application, it is not preferable that the distance H1 between the bottom wall of the deposition groove 138 and the first plane on which the first wall 25 is located is set too large or too small, and the value of the distance H1 can be specifically set according to the actual application. For example, the value range of the distance H1 between the bottom wall of the deposition groove 138 and the first plane on which the first wall 25 is located is [0.1mm, 25mm], and further, for example, the value range of the distance H1 between the bottom wall of the deposition groove 138 and the first plane on which the first wall 25 is located is [3mm, 20mm]. If the distance H1 is set too small, it is difficult to meet the actual needs of the battery 10, and when thermal runaway occurs in the battery cell 20, the waste discharged through the pressure reducing mechanism 213 will be excessively deposited in the deposition groove 138, and if the distance between the waste and the first wall 25 of the battery cell 20 is too small, it will affect the corresponding battery cell 20, and the thermal diffusion phenomenon is likely to occur between the multiple battery cells 20 corresponding to the deposition groove 138, and at the same time, it will have a thermal effect on other adjacent battery cells 20, reducing the safety of the battery 10. If the distance H1 is set too large, the space utilization rate inside the battery 10 will decrease, and the processing cost of the battery 10 will increase. Therefore, the value of the distance H1 may be set to 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm or 25 mm, or the value may be set within a range obtained by a combination of any two of the above values.

[0157] Although the present application has been described with reference to the preferred embodiments, various modifications can be made and the elements can be replaced with equivalents without departing from the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural contradiction. The present application is not limited to the specific embodiments disclosed in this specification, but includes all technical solutions included in the claims.

Claims

1. The battery cell module includes a housing (11), a battery cell module (200), and a support member (13), The housing (11) includes an electrical cavity; The battery cell module (200) is accommodated in the electrical cavity (11a), the battery cell module (200) includes a plurality of battery cells (20) arranged along a first direction, and a pressure reduction mechanism (213) is installed in at least two battery cells (20) among the plurality of battery cells (20), and the pressure reduction mechanism (213) is installed in a first wall (25) of the battery cells (20); The battery, characterized in that the support member (13) is attached to the first wall (25) to support the battery cell (20), the support member (13) includes relief cavities (131) corresponding to at least two of the pressure reduction mechanisms (213) in the battery cell module (200), and the relief cavities (131) are used to provide deformation space for operation of the at least two pressure reduction mechanisms (213).

2. 2. The battery of claim 1, wherein an escape opening (132) is provided on a surface of the support member (13) adjacent to the battery cell module (200), at least two of the pressure reducing mechanisms (213) face the escape opening (132), and the escape cavity (131) communicates with the escape opening (132).

3. 3. The battery of claim 2, wherein when the pressure reducing mechanism (213) is activated, discharge from the battery cell (20) enters the relief cavity (131) through the relief opening (132) and is discharged from the relief cavity (131).

4. The battery according to claim 2 or 3, characterized in that the relief cavities (131) and / or the relief openings (132) are arranged continuously along the first direction.

5. The battery according to any one of claims 1 to 4, characterized in that the relief cavity (131) is provided with a weakened area (133), and the weakened area (133) is used to allow the discharged material to pass through the weakened area (133) and thereby be discharged from the relief cavity (131) when the pressure reducing mechanism (213) is activated.

6. 6. The battery of claim 5, wherein the weakened area (133) is ruptured upon activation of the pressure reducing mechanism (213), thereby allowing the effluent to escape from the escape cavity (131).

7. 7. The battery of claim 6, wherein the relief cavity (131) comprises a bottom wall (134) and a side wall (135), the bottom wall (134) being located opposite the first wall (25), the side wall (135) being connected to the bottom wall (134) and extending towards the first wall (25), and the weakened area (133) being located on the bottom wall (134) and / or the side wall (135).

8. 8. The battery of claim 7, wherein the weakened area (133) is located at an end along the first direction of the bottom wall (134) and / or the side wall (135).

9. The weakened area (133) satisfies the following: ##EQU14## The battery according to any one of claims 6 to 8, characterized in that d is the minimum thickness of the weakened area (133) and E is the volumetric energy density of the battery cell (20).

10. The weakened area (133) satisfies the following: ##EQU00015## Here, T １ The battery according to any one of claims 6 to 9, characterized in that: t is the melting point of the material of the weakened area (133), and E is the volumetric energy density of the battery cell (20).

11. The battery according to any one of claims 6 to 10, characterized in that the thickness of the weakened area (133) is smaller than the thickness of the area of ​​the relief cavity (131) other than the weakened area (133).

12. The battery according to any one of claims 6 to 11, characterized in that the melting point of the material of the weak area (133) is lower than the melting point of the material of the other areas of the relief cavity (131) than the weak area (133).

13. The battery according to any one of claims 5 to 12, characterized in that the weak area (133) includes a through hole (136), and when the pressure reducing mechanism (213) is activated, the discharged material passes through the through hole (136) and is discharged from the relief cavity (131).

14. 14. The battery of claim 13, wherein the weakened area (133) further includes a sealing structure (137) for sealing the through hole (136), the sealing structure (137) being broken upon activation of the pressure reduction mechanism (213), thereby allowing the exhaust of the battery cell (20) to penetrate through the through hole (136).

15. The battery of claim 14, wherein the sealing structure (137) fills the through hole (136).

16. The sealing structure (137) is installed on an inner surface of the relief cavity (131) corresponding to the through hole (136); and / or The battery according to claim 14, characterized in that the sealing structure (137) is installed on an outer surface corresponding to the through hole (136) of the relief cavity (131).

17. The battery according to any one of claims 1 to 16, characterized in that the relief cavity (131) comprises a bottom wall (134) placed opposite the first wall (25), and along a second direction, the distances between at least two areas of the bottom wall (134) and a first plane in which the first wall (25) is located are different, and the second direction is perpendicular to the first wall (25).

18. In the first direction, the distance along the second direction between at least a portion of the bottom wall (134) and the first plane gradually increases; and / or 18. The battery of claim 17, wherein in the first direction, a distance along the second direction between at least a portion of the bottom wall (134) and the first plane gradually decreases.

19. 20. The battery of claim 18, wherein in the first direction, the distance between the bottom wall (134) and the first plane along the second direction gradually increases or gradually decreases from a center of the bottom wall (134) toward an end of the bottom wall (134).

20. The battery according to any one of claims 17 to 19, characterized in that the bottom wall (134) comprises an arcuate surface and / or a flat surface.

21. The battery according to any one of claims 17 to 20, characterized in that the bottom wall (134) is provided with a dipping groove (138) having an opening facing the first wall (25), and along the second direction, the distance between the groove bottom wall of the dipping groove (138) and the first plane is greater than the distance between the area of ​​the bottom wall (134) other than the dipping groove (138) and the first plane.

22. 22. The battery of claim 21, wherein the recess (138) is located at an end of the bottom wall (134) along the first direction.

23. 23. The battery according to claim 21 or 22, characterized in that the bottom wall (134) is provided with a plurality of the immersion grooves (138) arranged at intervals along the first direction.

24. a collection cavity (11b) for collecting discharge from the battery cell (20) upon operation of the pressure reducing mechanism (213); The battery according to any one of claims 1 to 23, characterized in that the support member (13) is further used to separate the collecting cavity (11b) and the electrical cavity (11a).

25. 25. The battery according to claim 24, further comprising a protective member (113) adapted to surround the support member (13) and form the collection cavity (11b).

26. The battery described in any one of claims 1 to 25, characterized in that the support member (13) is at least a part of a wall of the housing (11), and the support member (13) is used to allow exhaust from the battery cell (20) to pass through the support member (13) and be discharged from the housing (11) when the pressure reduction mechanism (213) is activated.

27. The battery of any one of claims 1 to 26, wherein the support member (13) is a thermal management member (139) used to regulate the temperature of the battery cells (20).

28. 1. A power consuming device, comprising: A power consuming device comprising a battery according to any one of claims 1 to 27 adapted to supply electrical energy to said power consuming device.

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