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 advancement of battery technology, various new energy industries using batteries as energy storage devices are rapidly developing. Currently, in the development of battery technology, in addition to improving battery performance, battery safety issues are also an issue that cannot be ignored. If it is difficult to ensure battery safety issues, the battery cannot be used. Therefore, how to improve the safety performance of batteries is a technical issue that needs to be resolved 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, wherein the housing includes an electrical cavity, the battery cell module is accommodated in the electrical cavity, the battery cell module includes a plurality of battery cells arranged along a first direction, pressure reduction mechanisms are installed in at least two battery cells in the battery cell module, the pressure reduction mechanisms are installed on first walls of the battery cells, a support member is attached to the first wall and supports the battery cells, the support member includes relief cavities corresponding to the at least two pressure reduction mechanisms in the battery cell module, and the relief cavities are used to provide deformation space for operation of the at least two pressure reduction mechanisms.

[0005] Therefore, in an embodiment of the present application, a support member is installed on the battery and attached to the first wall of the battery cell, providing support for the battery cell and thereby allowing the first wall to have excellent compressive strength. When external pressure acts on the battery, the installed support member can block most or even all of the external pressure, thereby reducing or eliminating the impact of the external pressure on the battery cell and improving the pressure resistance and safety of the battery. Furthermore, a pressure-reducing mechanism is also 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. Therefore, when the pressure-reducing mechanisms are activated, the relief cavities of the support member are used to provide deformation space for the pressure-reducing mechanisms, preventing the support member from blocking the pressure-reducing mechanisms and allowing waste from the battery cells to be smoothly discharged through the pressure-reducing mechanisms.

[0006] In some embodiments, relief openings are provided on a surface of the support member adjacent to the battery cell modules, at least two of the pressure reduction mechanisms face the relief openings, and the relief cavities communicate with the relief openings. By providing relief openings on the surface of the support member adjacent to the battery cell modules, when the pressure reduction mechanisms are activated, the effluent discharged from the pressure reduction mechanisms can quickly enter the relief cavities through the relief openings, preventing the effluent from accumulating in the electrical cavities and thereby minimizing the risk of the effluent conducting to electrical connection members in the electrical cavities and causing short circuits, thereby improving the safety of the battery.

[0007] In some embodiments, when the pressure reduction mechanism is activated, the exhaust from the battery cells enters the relief cavity through the relief opening and is discharged from the relief cavity. When thermal runaway occurs in the battery cells, due to the limited space inside the relief cavity, the exhaust discharged through the pressure reduction mechanism is likely to accumulate in the relief cavity, causing thermal impact on the pressure reduction mechanism and causing 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 is discharged to the outside of the relief cavity, avoiding thermal diffusion caused by the exhaust accumulating in the relief cavity and thereby improving the safety of the battery.

[0008] In some embodiments, the relief cavities and / or relief openings are arranged consecutively along the first direction, so that in the embodiments of the present application, the relief cavities can be arranged consecutively along the first direction, and the relief cavities can accommodate a plurality of pressure reduction mechanisms, and / or the relief openings can be arranged consecutively along the first direction, and the relief openings can accommodate a plurality of pressure reduction mechanisms, thereby avoiding a situation in which one or more of the pressure reduction mechanisms arranged along the first direction do not correspond to a relief cavity or a relief opening, i.e., avoiding a situation in which the pressure reduction mechanism between two adjacent relief cavities does not correspond to a relief cavity, and also avoiding a situation in which the pressure reduction mechanism between two adjacent relief openings does not correspond to a relief opening, so that any discharged 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, facilitating processing and assembly of the battery.

[0009] In some embodiments, the relief cavity is located in a weakened area, and the weakened area is used to allow the effluent to pass through the weakened area and be discharged from the relief cavity when the pressure reduction mechanism is activated. In this way, when thermal runaway occurs in the battery cell, the effluent discharged through the pressure reduction mechanism can enter the relief cavity and then be discharged through the weakened area of ​​the relief cavity, which not only effectively prevents the effluent from accumulating in the relief cavity and causes thermal diffusion, but also realizes directional discharge. For example, by rationally locating the weakened area, the effluent can be discharged from a specific area to prevent the effluent 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, allowing the discharged material to be discharged from the relief cavity. Therefore, when the pressure reducing mechanism is not activated, for example, during normal use of the battery, the relief cavity is relatively sealed, effectively protecting the relief cavity 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 the strength of the other areas on the relief cavity, so the weakened area is easily broken, allowing the discharged material from the battery cell to 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 being positioned opposite the first wall, the side wall being connected to the bottom wall and extending toward the first wall, and the weakened region being positioned on the bottom wall and / or the side wall.

[0012] In the embodiment of the present application, when a weakened area is installed on the bottom wall of the relief cavity, in the event of thermal runaway in the battery cell, the effluent discharged through the pressure reduction mechanism can be quickly and directly discharged to the outside of the relief cavity through the bottom wall of the relief cavity, improving battery safety. Also, in the event of thermal runaway in the battery cell, if the high-temperature and high-pressure effluent discharged through the pressure reduction mechanism enters the relief cavity, it will be discharged toward the side wall of the relief cavity and will accumulate in an area close to the side wall due to the blocking effect of the side wall of the relief cavity. Therefore, installing a weakened area on the side wall of the relief cavity is advantageous for quickly discharging the effluent and effectively preventing the effluent from accumulating on the side wall of the relief cavity.

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

[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 cases, the sealing at the intersection between the bottom wall and the side wall of the relief cavity is poor, so that an airflow passage is formed at the poorly sealed intersection. Under the action of the internal and external pressure difference, the airflow generated during the battery thermal runaway process will move the emissions to the intersection between the bottom wall and the side wall of the relief cavity, further promoting the accumulation of the emissions at the intersection between the bottom wall and the side wall of the relief cavity. In addition, when multiple pressure reduction mechanisms corresponding to the relief cavities are arranged along the first direction, the side walls at the ends of the relief cavities are smaller in size than the other walls, so the waste material discharged through the pressure reduction mechanisms tends to accumulate most at the ends of the bottom wall and / or side wall of the relief cavity along the first direction, which is likely to cause thermal diffusion of the battery cell. By installing a weak area at the ends of the bottom wall and / or side wall along the first direction, thermal diffusion caused by the waste material accumulating in the relief cavity 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 embodiments of the present application, a reasonable value for d / E allows the effluent generated by the battery cell to be discharged quickly and smoothly, thereby improving battery safety. Specifically, if the d / E value is set too large, the minimum thickness d of the weakened region of the relief cavity may be set relatively large, which may result in a relatively small volumetric energy density E of the battery cell. Therefore, if the temperature or pressure of the effluent discharged in the event of thermal runaway in the battery cell is low and the minimum thickness d of the weakened region of the relief cavity is set too large, the effluent may break the relief cavity, making it difficult to discharge the effluent immediately, or it may take too long to break the relief cavity. Ultimately, the effluent may be restricted to the relief cavity below the pressure reducing mechanism, resulting in limited space in the relief cavity and potentially causing thermal diffusion between battery cells. Therefore, it is undesirable to set the d / E value too large.

[0017] Conversely, it is also undesirable to set the value of d / E too small. Due to structural constraints on 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, when the volumetric energy density E of the battery is constant, the minimum thickness d of the weak area of ​​the relief cavity will be small, the structural strength of the relief cavity will be insufficient, and the battery will be more susceptible to breakage under normal use conditions, the sealing performance of the relief cavity will be reduced, and the safety of the battery will also be reduced.

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

number

[0019] Therefore, in the embodiments of the present application, by rationally setting the value of T1 / E, waste generated by the battery cell can be discharged quickly and smoothly, thereby improving battery safety. Therefore, it is not preferable to set the value of T1 / E too small in the embodiments of the present application. 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 T1 / E is too small, that is, when the volumetric energy density E of the battery cell is constant, the melting point T1 of the material of the weak region of the relief cavity will be small. On the one hand, it will be more difficult to select the material, and on the other hand, the structural strength of the relief cavity will be insufficient. During normal use of the battery, such as during charging and discharging, there may be a situation where the battery temperature rises. In this case, the weak region of the relief cavity will be easily softened or melted during normal use of the battery, reducing the sealing performance of the relief cavity and reducing the safety of the battery.

[0020] In the embodiments of the present application, it is undesirable to set the value of T1 / E too high. If the value of T1 / E is too high, that is, the melting point T1 of the material of the weak region of the relief cavity is set relatively high and the volumetric energy density E of the battery cell is set relatively low, the temperature of the effluent discharged through the pressure reduction mechanism when thermal runaway occurs in the battery cell will be low. If the melting point T1 of the material of the weak region of the relief cavity is set too high, the effluent will not melt the weak region of the relief cavity and will not be able to be discharged immediately, or it will take too long to melt the weak region of the relief cavity, so the effluent will be restricted within the relief cavity corresponding to the pressure reduction mechanism, and the space of the relief cavity will be limited, which will easily cause heat diffusion 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 weakened region is lower than the melting point of the material of the other region of the relief cavity, so that the weakened region is more sensitive to temperature than the other region of the relief cavity, and when the pressure reducing mechanism is activated, the weakened region 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 advantageous to 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, thereby making the through-hole disposed in the relief cavity a weakened area, which on the one hand facilitates battery processing and assembly, 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 advantageous to improve the discharge efficiency of the effluent and thereby improve the safety of the battery.

[0024] In some embodiments, the weakened area further includes a sealing structure for sealing the through-hole, and the sealing structure is broken when the pressure reducing mechanism is activated, allowing exhaust from the battery cell to pass 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 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 thermal runaway occurs in the battery cell, the effluent discharged through the pressure reduction mechanism can immediately and smoothly destroy the sealing structure, exposing the through-hole, so that the effluent can pass through the through-hole and be discharged to the outside of the relief cavity, improving the safety of the battery.

[0026] In some embodiments, the sealing structure fills the through-holes, thereby saving the internal space of the battery, improving the space utilization rate of the battery, and at the same time 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] Therefore, 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 reduction mechanism and is quickly destroyed by the effluent discharged through the pressure reduction mechanism. For example, the sealing structure can quickly respond to the temperature of the battery cell, causing the sealing structure to melt quickly, avoiding affecting the operation of the pressure reduction mechanism and allowing the effluent to be discharged immediately and smoothly. 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 reduction mechanism can provide a deformation space for the operation of the pressure reduction mechanism, avoiding affecting the normal function of the pressure reduction mechanism. Furthermore, when the sealing structure is installed simultaneously on the inner and outer surfaces corresponding to the through-hole of the relief cavity, the sealing performance of the relief cavity can be improved.

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

[0030] In the present embodiment, the distances along the second direction between different regions of the bottom wall and the first plane can be reasonably set based on the amount of waste accumulated in different regions of the bottom wall of the relief cavity. For example, if the bottom wall of the relief cavity includes a first region and a second region, and if, due to gravity, more waste from the battery cells is collected in the first region than in the second region when thermal runaway occurs in the battery cells, the distance between the first region and the first plane can be set 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 accumulating in the relief cavity, which is advantageous to improving the safety performance of the battery.

[0031] In some embodiments, a distance between at least a portion of the bottom wall and the first plane along the second direction gradually increases in the first direction, and / or a distance between at least a portion of the bottom wall and the first plane along the second direction gradually decreases in the first direction, so that at least a portion of the bottom wall is inclined along the first direction, and the effluent discharged through the pressure reducing mechanism is deposited in a specific region of the bottom wall of the relief cavity by gravity, and the distance between the specific region and the first plane is also far, i.e., by controlling the specific deposition region of the effluent on the bottom wall of the relief cavity, the thermal impact on the battery cell is reduced and the safety of the battery is improved.

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

[0033] In the present embodiment, because the size of the end sidewalls of the relief cavity along the first direction is small, the effluent discharged through the pressure reduction mechanism accumulates more at the end positions. Therefore, if the bottom wall of the relief cavity is arranged 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 toward the end of the bottom wall along the first direction, the distance between the end region of the bottom wall and the first plane along the second direction is large. Therefore, when thermal runaway occurs in the battery, the end positions of the relief cavity along the first direction have a large space to accommodate the effluent discharged through the pressure reduction mechanism, thereby reducing the impact on the pressure reduction mechanism and improving the safety of the battery. Correspondingly, if the bottom wall of the relief cavity is arranged 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 toward both ends of the bottom wall. Because the distance between the central region of the bottom wall and the first plane is large, the effluent discharged through the pressure reduction mechanism moves to the central region of the bottom wall under the influence of gravity, thereby reducing the impact on the pressure reduction 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 effluent 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, a deposition groove having an opening facing the first wall is provided in the bottom wall, and along the second direction, the distance between the bottom wall of the deposition groove and the first plane is greater than the distance between the 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 installed on the bottom wall of the relief cavity, so that when the pressure reduction mechanism is activated, a sedimentation groove of a certain depth exists on the bottom wall of the relief cavity, and the sedimentation groove has a certain depth to accommodate 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 effluent discharged through the pressure reduction mechanism is more likely to accumulate on the end side wall of the relief cavity. By locating the deposition groove at the end position of the bottom wall along the first direction, the effluent can be deposited in the deposition groove, thereby reducing the thermal impact on the pressure reduction 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 some 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 to accommodate the effluent discharged through the pressure reduction mechanism. Thus, when a thermal runaway occurs in the battery cell, the deposition grooves are provided in a plurality of regions of the bottom wall of the relief cavity where a large amount of effluent is present, thereby effectively preventing the effluent in the plurality of regions from affecting the corresponding pressure reduction mechanism and avoiding thermal diffusion caused by the effluent accumulating in the relief cavity, which is beneficial to improving the safety of the battery.

[0039] In some embodiments, the battery further includes a collection cavity used to collect effluent 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 centrally collect and / or process effluent when the pressure reducing mechanism is activated and then discharge the effluent to the outside of the battery. At the same time, the support member can also function as an isolation member to separate the electrical cavity of the battery cells from the collection cavity that collects effluent, thereby avoiding mutual influence between them and preventing at least some of the effluent from entering the electrical cavity from the collection cavity, thereby avoiding thermal diffusion.

[0040] In some embodiments, the battery further includes a protective member surrounding 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 discharged matter discharged through the decompression mechanism, reducing the risk of such a problem. At the same time, the protective member can protect the support member and prevent it from being damaged by foreign objects.

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

[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 can be used to cool or heat the battery cells, thereby relatively stabilizing the temperature of the battery and improving the operating efficiency of the battery.

[0043] According to a second aspect, there is provided a power consuming device, the power consuming device including 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 explanation 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. 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 any creative efforts.

[0046] [Figure 1] 1 is a structural schematic diagram of a vehicle according to an embodiment of the present invention; [Figure 2] 1 is a structural schematic diagram of a battery according to an embodiment of the present application; [Figure 3] 1 is a cross-sectional schematic 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. [Figure 5] FIG. 2 is an exploded view of a battery cell according to an embodiment of the present application. [Figure 6] 1 is a cross-sectional schematic 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 one embodiment of the present application. [Figure 11] FIG. 10 is a structural schematic diagram of another example relief cavity according to an embodiment of the present application. [Figure 12] FIG. 10 is a structural schematic diagram of yet another example relief cavity according to an embodiment of the present application. [Figure 13] FIG. 10 is a structural schematic diagram of yet another example relief cavity according to an embodiment of the present application. [Figure 14] 1 is a structural schematic diagram of a relief cavity with a deposition groove according to an embodiment of the present application; [Figure 15] FIG. 10 is a structural schematic diagram of a relief cavity with a deposition groove according to another embodiment of the present application. [Figure 16] FIG. 10 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 INVENTION

[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 exemplify 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] It should be noted that in the description of this application, unless otherwise specified, "multiple" means two or more, and the orientations or positional relationships indicated by terms such as "up," "down," "left," "right," "inside," and "outside" are merely for ease of explanation and simplification of the description, and do not indicate or imply that the subject devices or elements have a particular orientation or should be configured and operated in a particular orientation, and therefore should not be understood as limiting the application. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. "Perpendicular" does not mean perpendicular in the strict sense, but is within a tolerance range. "Parallel" does not mean parallel in the strict sense, but is within a tolerance range.

[0050] Any directional expressions appearing in the following description refer to the directions shown in the drawings and do not limit the specific structure of the present application. It should be further explained that, unless otherwise clearly specified and limited, the terms "attached," "connected," and "connect" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection. They may be directly connected or indirectly connected via an intermediate medium. Those skilled in the art can understand the specific meanings of the above terms in the present application according to specific circumstances.

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

[0052] In this application, the battery cells may include lithium ion secondary batteries, lithium ion primary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries, magnesium ion batteries, etc., but the embodiments of this application are not limited thereto. The battery cells may be cylindrical, flat, rectangular, or have other shapes, but the embodiments of this application are not limited thereto. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, but the embodiments of this application are not limited thereto.

[0053] The battery referred to in the embodiments of this application refers to a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this 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] A 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 operates primarily through the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector, and the current collector without the positive electrode active material layer protrudes from the current collector with the positive electrode active material layer coated thereon, and the current collector without the positive electrode active material layer is called a positive electrode tab. For example, in a lithium-ion battery, the positive electrode current collector may be made of aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, 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 coated on the surface of the negative electrode current collector, and the portion of the current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer. The portion of the current collector not coated with the negative electrode active material layer is referred to as 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. To ensure that melting does not occur due to a large current, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The material of the separator may be polypropylene (PP) or polyethylene (PE), etc. The electrode assembly may have a wound structure or a stacked structure, but the present application is not limited thereto.

[0055] The development of battery technology requires simultaneous consideration of various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge efficiency, as well as battery safety.

[0056] The main safety hazards for battery cells stem from the charging and discharging processes. To effectively prevent unnecessary losses while also taking into account appropriate environmental temperature design, battery cells generally have at least three protective measures. Specifically, these measures include at least a switching element, an appropriately selected separator material, and a pressure reduction mechanism. A switching element is a device that can stop the charging or discharging of a battery when the temperature or resistance within the battery cell reaches a certain threshold. The separator is used to separate the positive and negative electrode sheets. When the temperature rises to a certain level, the micrometer-order (or even nanometer-order) pores on the separator dissolve by themselves, preventing metal ions from passing through the separator and halting the internal reaction of the battery cell.

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

[0058] As used herein, "activation" 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 portion of the pressure reduction mechanism rupturing, crushing, tearing, or opening. When the pressure reduction mechanism is activated, high-temperature and high-pressure materials inside the battery cell are released as discharged material from the activated location. In this manner, pressure and temperature can be released from the battery cell under controllable pressure or temperature conditions, preventing the occurrence of potentially more serious accidents.

[0059] The discharged materials from the battery cell referred to in this application include, but are 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 battery safety. For example, if a short circuit or overcharging occurs, thermal runaway can occur inside the battery cell, causing a sudden rise in pressure or temperature. In such cases, the pressure reduction mechanism can be activated to release the internal pressure and temperature to the outside.

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

[0062] In view of this, embodiments of the present application provide 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 housed in an electrical cavity of the housing, and the battery cell module includes a plurality of battery cells arranged along a first direction. At least two battery cells in the battery cell module are provided with pressure reduction mechanisms, the pressure reduction mechanisms being installed on first walls of the battery cells. The support member is attached to the first wall, and the support member includes relief cavities corresponding to the at least two pressure reduction mechanisms in the battery cell module, the relief cavities being used to provide deformation space for the operation of the at least two pressure reduction mechanisms. Thus, in embodiments of the present application, the support member is attached to the battery and the first wall of the battery cells, providing support for the battery cells, thereby providing the first wall with excellent compressive strength. When 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 cells and improving the pressure resistance and safety 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 deformation space for the pressure reduction mechanism, preventing the support member from blocking the pressure reduction mechanism, and allowing the waste from the battery cell to be smoothly discharged through the pressure reduction mechanism.

[0063] The technical solutions described in the embodiments of this application are all applicable to various power-consuming devices that use batteries.

[0064] The power consuming devices may be vehicles, mobile phones, mobile devices, laptops, ships, spacecraft, electric toys, power tools, etc. The vehicles may be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles, and the new energy vehicles may be pure electric vehicles, hybrid vehicles, range-extender vehicles, etc. The spacecraft may include aircraft, rockets, space shuttles, spaceships, etc. The electric toys may include game consoles, electric car toys, electric ship toys, and electric aircraft toys, and other stationary or mobile electric toys. The power tools may include metal cutting tools such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drivers, concrete vibrators, and electric planers, as well as polishing power tools, assembly power tools, and railroad electric tools. The present application does not particularly limit the above power consuming devices.

[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 example of a power consumption device being a vehicle.

[0066] For example, FIG. 1 shows a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extender vehicle, or the like. A motor 40, a controller 30, and a battery 10 may be installed inside the vehicle 1. The controller 30 is used to control the battery 10 and supply power to the motor 40. For example, the battery 10 may be installed at the bottom, front, or rear of the vehicle 1. The battery 10 is used to supply power to the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1 and for the circuit system of the vehicle 1, for example, to meet the operating power needs of the vehicle 1 during startup, navigation, and driving. In another embodiment of the present application, the battery 10 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1.

[0067] To meet various power consumption needs, the battery 10 in the embodiments 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, which includes multiple battery cells. The multiple battery cells are connected in series, parallel, or series-parallel to form the battery 10, with the series-parallel connection referring to a combination of series and parallel connections. The battery 10 may also be called a battery pack. For example, multiple battery cells may first be connected in series, parallel, or series-parallel to form a battery module, and then multiple battery modules may be further connected in series, parallel, or series-parallel to form the battery 10. That is, multiple battery cells may directly form the battery 10, or first form a battery module, which in turn forms the battery 10.

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

[0069] As shown in FIGS. 2 to 4 , a battery 10 according to an embodiment of the present application may include a housing 11, a battery cell module 200, and a support member 13, wherein 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, pressure reduction mechanisms 213 are installed in at least two battery cells 20 in the battery cell module 200, the pressure reduction mechanisms 213 are installed in first walls 25 of the battery cells 20, the support member 13 is attached to the first wall 25 to support the battery cells 20, and the support member 13 includes relief cavities 131 corresponding to the at least two pressure reduction mechanisms 213 in the battery cell module 200, and the relief cavities 131 are used to provide deformation space for the operation of the at least two pressure reduction mechanisms 213.

[0070] The shape of the battery cell 20 in the embodiments 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 formed by being surrounded by multiple walls, and therefore the battery cell 20 may include multiple walls. Here, a pressure reducing mechanism 213 is installed in a 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. Alternatively, the first wall 25 may be the wall of the battery cell 20 with the largest area, and the embodiments of the present application are not limited thereto.

[0071] In addition, 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] Optionally, the shape of the electrical cavity 11a can be determined based on the battery cells 20 to be housed therein. 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, which is easy to process. The electrical cavity 11a of the present embodiment can be formed in various ways. For example, as shown in FIG. 2 and FIG. 3, the housing 11 may include multiple parts with the same or different shapes, and the multiple parts are connected and engaged with each other to form a hollow rectangular parallelepiped, but the present embodiment 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 components 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 cavities 11a in the embodiments of the present application may be used to accommodate bus members 12, i.e., the electrical cavities 11a provide mounting spaces for the battery cells 20 and the bus members 12. The bus members 12 are used to realize electrical connections between multiple 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] 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, capable of buffering and resisting external pressure, and having high compressive strength. For example, the material of the support member 13 may be a metal material such as copper or aluminum. Alternatively, the material of the support member 13 may be a non-metal material with a certain strength, such as mica or ceramic.

[0076] The support member 13 in the embodiment of the present application includes a relief cavity 131, which 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 pressure reduction mechanism 213 inside or outside 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, a support member 13 is installed on the battery 10 and attached to the first wall 25 of the battery cell 20, thereby providing support to the battery cell 20 and allowing the first wall 25 to have excellent compressive strength. When external pressure acts on the battery 10, the installed support member 13 can block 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 of the battery 10. In addition, a pressure reducing mechanism 213 is also 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. As a result, when the pressure reducing mechanism 213 is activated, the relief cavities 131 of the support member 13 are used to provide deformation space for the pressure reducing mechanism 213, preventing the support member 13 from blocking the pressure reducing mechanism 213 and allowing waste from the battery cell 20 to be smoothly discharged through the pressure reducing mechanism 213.

[0078] Note that the housing 11 of the embodiments of the present application can be realized in various ways, and the embodiments of the present application are not limited thereto. For example, as shown in FIGS. 2 and 3 , the housing 11 may include a first cover 110 having an opening for the electrical cavity 11a, and the support member 13 covers the opening of the first cover 110 to form the electrical cavity 11a. As a result, the wall for forming the electrical 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 open end, or the first cover 110 may include a first portion 111 and a second portion 112 with openings on opposite sides, where the first portion 111 covers the opening on one side of the second portion 112 to form the first cover 110 with an open end, and the support member 13 covers the opening on the other side of the second portion 112 to form the electrical 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 also isolate the collection cavity 11b. The second cover may also be implemented in various ways, for example, the second cover may include a third portion and a fourth portion, one side of the fourth portion having an opening to form a semi-sealed structure, the support member 13 installed inside the fourth portion, and the third portion covering the opening of the fourth portion to form the sealed second cover.

[0080] 2 and 3, in some embodiments, 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 activated, and the support member 13 in the present embodiment is further used to isolate the collection cavity 11b from the electrical cavity 11a. The collection cavity 11b can centrally collect and / or process exhaust from the battery cells 20 when the pressure reducing mechanism 213 is activated, and can further discharge the exhaust to the outside of the battery 10. At the same time, the support member 13 in the present embodiment serves as an isolation member, separating the electrical cavity 11a that accommodates the battery cells 20 from the collection cavity 11b that collects the exhaust, thereby avoiding mutual influence between them and preventing at least some of the exhaust from entering the electrical cavity 11a from the collection cavity 11b, 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 in the collection cavity 11b or a liquid member may be installed in the collection cavity 11b to further reduce the temperature of the effluent entering the collection cavity 11b. Optionally, the gas or liquid in the collection cavity 11b may be installed to circulate.

[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, 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 surrounds the support member 13 to form the collection cavity 11b. In this embodiment, the protective member 113 and the support member 13 form the collection cavity 11b, which can effectively collect and buffer the effluent discharged through the pressure reducing mechanism 213, reducing the risk of damage. At the same time, the protective member 113 can protect the support member 13 and prevent it from being damaged 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, thereby relatively stabilizing the temperature of the battery 10 and improving the operating efficiency of the battery 10.

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

[0086] The embodiment of the present application does not limit the 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] Alternatively, in some embodiments, instead of the above-described installation method, as shown in FIG. 4 , the support member 13 of the battery 10 may be at least a part of the wall of the housing 11, and the support member 13 is used to allow waste from the battery cells 20 to pass through the support member 13 and be discharged from the housing 11 when the pressure-reducing mechanism 213 is activated. In the embodiments of the present application, by using the support member 13 as at least a part of the wall of the housing 11, waste discharged through the pressure-reducing mechanism 213 can be directly discharged to the outside of the housing 11 through the support member 13, thereby saving space in the battery 10, improving the space utilization rate of the housing 11, facilitating installation of the battery 10, and improving processing efficiency of the battery 10. For example, when thermal runaway occurs in the battery cells 20, waste 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 broken when the pressure reducing mechanism 213 is activated, so that 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 to this.

[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 batteries 10 shown in FIGS. 2 and 4. As shown in FIG. 5, the battery cell 20 includes an outer case 21, which may include multiple walls, i.e., the multiple walls surround the outer case 21 to form a hollow outer case 21. The outer case 21 may include a housing 211 and a cover plate 212. The walls of the housing 211 and the cover plate 212 are both referred to as the walls 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 side of the housing 211 has an opening, allowing one or more electrode assemblies 22 to be disposed within the housing 211. For example, if the housing 211 is a hollow rectangular parallelepiped or cube, at least one flat surface of the housing 211 is an open surface, i.e., the open surface has no walls 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 has no walls 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 activated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold. 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 facilitates installation. For convenience of explanation, the embodiments of the present application mainly use as an example the first wall 25 being 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 or not 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 may be two independent parts connected together.

[0090] 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, i.e., 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 recessed groove in the first wall 25. 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 cells 20 generate too much gas and the internal pressure of the housing 211 increases and reaches a threshold value, or when heat is generated by an internal reaction in the battery cells 20 and the internal temperature of the battery cells 20 increases and reaches a threshold value, the battery cells 20 rupture at the shallow groove, connecting 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 reducing mechanism 213 of the embodiment of the present application may be any of various possible pressure reducing structures, and the embodiment of the present application is not limited thereto. For example, the pressure reducing mechanism 213 may be a temperature-sensitive pressure reducing mechanism configured to melt when the internal temperature of the battery cell 20 to which the pressure reducing mechanism 213 is installed reaches a threshold, and / or the pressure reducing mechanism 213 may be a pressure-sensitive pressure reducing mechanism configured to burst when the internal air pressure of the battery cell 20 to which the pressure reducing mechanism 213 is installed reaches a threshold.

[0092] Optionally, in one embodiment of the present application, when 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 , this embodiment of the present application will be described as an example in which the wall on which the electrode terminal 214 is located is 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 this case, the wall on which the electrode terminal 214 is located may be the cover plate 212 of the battery cell 20. This prevents waste discharged through the pressure reducing mechanism 213 from affecting 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 to electrically connect the electrode assemblies 22 and the electrode terminals 214.

[0095] 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, if the first tab 221 is a positive electrode tab, the second tab 222 is a negative electrode 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 electrode terminal 214 is connected to the positive electrode tab via one connecting member 23, and the negative electrode terminal 214 is connected to the negative electrode 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] 5 , the battery cell 20 may further include a pad 24. The pad 24 is located between the electrode assembly 22 and the bottom wall of the housing 211 and can support the electrode assembly 22 and effectively prevent interference between the electrode assembly 22 and the fillet around the bottom wall of the housing 211. The pad 24 may further include one or more through-holes, such as a uniformly arranged plurality of through-holes. Alternatively, if a pressure reducing mechanism 213 is installed in the bottom wall of the housing 211, a through-hole may be provided at a position corresponding to the pressure reducing mechanism 213, thereby facilitating the passage of liquids and gases. Specifically, the spaces on the upper and lower surfaces of the pad 24 may be connected to each other, allowing both gases and electrolyte generated inside the battery cell 20 to pass freely through the pad 24.

[0098] FIG. 6 is a cross-sectional schematic diagram of another example of the battery 10 according to 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 FIGS. 3 and 4. Note that 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 FIGS. 3 and 4 may be perpendicular to the first direction X of the battery 10, with the first direction X being 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 6. The first direction X and the third direction Y may further be parallel to the first wall 25, i.e., parallel to a first plane on which the first wall 25 is located.

[0099] 2 to 6 , in the embodiment of the present application, relief openings 132 are provided on the surface of the support member 13 adjacent to the battery cell modules 200, at least two pressure reduction mechanisms 213 face the relief openings 132, and the relief cavities 131 communicate with the relief openings 132. By providing the relief openings 132 on the surface of the support member 13 adjacent to the battery cell modules 200, when the pressure reduction mechanisms 213 are activated, the effluent discharged from the pressure reduction mechanisms 213 can quickly enter the relief cavities 131 through the relief openings 132, preventing the effluent from accumulating in the electrical cavities 11 a. This minimizes the risk of the effluent conducting to the electrical connection members of the electrical cavities 11 a and causing a short circuit, thereby improving the safety of the battery.

[0100] Optionally, in one embodiment, when the pressure reducing mechanism 213 is activated, the exhaust from the battery cell 20 enters the relief cavity 131 through the relief opening 132 and is discharged from the relief cavity 131. If 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, causing thermal impact on the pressure reducing mechanism 213 and resulting in 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 is discharged to the outside of the relief cavity 131, which is advantageous to avoid thermal diffusion caused by the exhaust accumulating 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 relief openings 132 may be arranged consecutively along the first direction X. In this way, by arranging the relief cavities 131 consecutively 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 consecutively 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 the relief openings 132 for the plurality of pressure reducing mechanisms 213 arranged along the first direction X, and thus That is, the 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 the 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 all of the discharged matter discharged from each pressure reduction mechanism 213 among the plurality of pressure reduction mechanisms 213 arranged along the first direction X can enter the relief cavity 131 via the relief opening 132, and at the same time, the structure is simple, making it easy to process and assemble the battery 10.

[0102] When the pressure reducing mechanism 213 is activated, the discharged matter from the battery cells 20 enters the relief cavity 131 through the relief opening 132 and is then 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, thereby ensuring the safety of the battery 10.

[0103] FIG. 7 is a partial enlarged view of a battery 10 according to an embodiment of the present disclosure. For example, FIG. 7 is an enlarged view of region A shown in FIG. 6. Optionally, as shown in FIGS. 6 and 7 , in one embodiment, a weakened area 133 may be provided in the relief cavity 131 of the embodiment of the present disclosure. The weakened area 133 is used to allow effluent discharged through the pressure reduction mechanism 213 to pass through the weakened area 133 and be discharged from the relief cavity 131 when the pressure reduction mechanism 213 is activated. In this way, when thermal runaway occurs in the battery cell 20, the effluent discharged through the pressure reduction mechanism 213 can enter the relief cavity 131 and then be discharged through the weakened area 133 of the relief cavity 131. This not only effectively prevents thermal diffusion caused by effluent accumulation in the relief cavity 131, but also achieves directional discharge. For example, by rationally positioning the weakened area 133, effluent can be discharged from a specific area to prevent the effluent from affecting other components, thereby improving the safety of the battery 10.

[0104] Specifically, in the embodiments of the present application, the weakened area 133 can be realized in various ways. For example, as shown in Figures 6 and 7, the weakened area 133 can be broken when the pressure reducing mechanism 213 is activated, allowing the effluent to be discharged from the relief cavity 131. When the pressure reducing mechanism 213 is not activated, for example, during normal use of the battery, the relief cavity 131 is relatively sealed, effectively protecting the relief cavity 131 from being broken by external forces. When the pressure reducing mechanism 213 is activated, the strength of the weakened area 133 on the relief cavity 131 is lower than the strength of the other areas on the relief cavity 131, so the weakened area 133 is easily broken, and the effluent from the battery cell 20 passes through the weakened area 133 and is discharged outside 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 being disposed relative to the first wall 25, the side wall 135 being connected to the bottom wall 134 and extending toward the first wall 25, and the weakened area 133 being disposed on the bottom wall 134 and / or the side wall 135. When the weakened area 133 is disposed on the bottom wall 134 of the relief cavity 131, in the event of thermal runaway occurring 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 weakened area 133 on 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 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 the area close to the side wall 135. Therefore, by installing the weak area 133 on the side wall 135 of the relief cavity 131, it is advantageous to immediately discharge the exhaust and effectively prevent the exhaust from accumulating on the side wall 135 of the relief cavity 131.

[0106] In one embodiment, the weakened area 133 may be located at an end of the bottom wall 134 and / or the side wall 135 along the first direction X. In an embodiment of the present application, as shown in Figures 6 and 7, when thermal runaway occurs in the battery cell 20, due to the blocking effect of the side wall 135 of the relief cavity 131 against the exhaust, the exhaust generally accumulates most 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 poor sealing at the intersection between the bottom wall 134 and the side wall 135 of the relief cavity 131, an airflow path is formed at the poorly sealed 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, further promoting the accumulation of the exhaust at the intersection between the bottom wall 134 and the side wall 135 of the relief cavity 131. Furthermore, when a plurality of pressure reducing mechanisms 213 corresponding to each release cavity 131 are arranged along the first direction X, the two side walls of each release cavity 131 arranged along the first direction X are smaller than the other walls. Therefore, the waste material discharged through the pressure reducing mechanisms 213 accumulates most at the ends of the bottom wall 134 and / or side wall 135 of each release cavity 131 along the first direction, which has a significant impact on the pressure reducing mechanisms 213 and is likely to cause thermal diffusion of the battery cells 20. By locating the weak areas 133 at the ends of the bottom wall 134 and / or side wall 135 along the first direction X, thermal diffusion caused by the waste material accumulating in the release cavity 131 can be effectively prevented, 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 region 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 effluent discharged in the event of thermal runaway in the battery cell 20 is low and the minimum thickness d of the weak region 133 of the relief cavity 131 is set too large, the effluent may destroy the relief cavity 131, making it difficult to immediately discharge the effluent, or it may take too long to destroy the relief cavity 131. Ultimately, the effluent may be restricted within the relief cavity 131 below the pressure reducing mechanism 213. Because the space in the relief cavity 131 is limited, the accumulated effluent may adversely affect the corresponding battery cell 20, which may easily cause thermal diffusion between the battery cells 20. Therefore, it is undesirable 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, when the volumetric energy density E of the battery 10 is constant, the minimum thickness d of the weakened region 133 of the relief cavity 131 becomes small, the structural strength of the relief cavity 131 becomes insufficient, and the battery 10 becomes more susceptible to breakage under normal use conditions, the sealing performance of the relief cavity 131 decreases, and the safety of the battery 10 also decreases.

[0110] Therefore, it is not preferable to set the value of d / E in the embodiments of the present application to be 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 combining any two of the following numerical values:

number

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

number

[0112] In the present embodiment, the volumetric energy density E of the battery cell 20 should not be set too high or too low, and can be set according to actual applications. For example, the volumetric energy density of the battery cell 20 ranges from 500 Wh / L to 1000 Wh / L. If the volumetric energy density E of the battery cell 20 is set too low, it will not be able to meet the energy demand of the battery 10. If the volumetric energy density E of the battery cell 20 is set too high, it will be difficult to process the battery cell 20 and make it difficult to realize. Therefore, the volumetric energy density E of the battery cell 20 may be set to 500 Wh / L, 550 Wh / L, 600 Wh / L, 650 Wh / L, 700 Wh / L, 750 Wh / L, 800 Wh / L, 850 Wh / L, 900 Wh / L, 950 Wh / L, or 1000 Wh / L, or may be set within a range obtained by combining any two of the above values.

[0113] Specifically, in one embodiment, in the situation where the weak region 133 in the battery 10 has different minimum thicknesses d and different volumetric energy densities E, the performance test results of the weak region 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 minimum thickness d of the weakened region 133 in different examples and comparative examples. The data in the second column indicate the volumetric energy density E of the battery cells 20 in different examples and comparative examples. The data in the third column indicate the ratio of the minimum thickness d of the weakened region 133 to the volumetric energy density E of the battery cells 20 in different examples and comparative examples. The fourth column indicates performance test results under experimental conditions simulating vibration and impact on the weakened region 133 in different examples and comparative examples. The vibration and impact simulate the action of external forces that the battery 10 may be subjected to during normal use. The test results include a situation in which the weakened region 133 is not destroyed and a situation in which the weakened region 133 is destroyed. The fifth column indicates performance test results under experimental conditions simulating the occurrence of thermal runaway in the battery cells 20 in different examples and comparative examples. The test results include a situation in which the weakened region 133 is destroyed by the effluent discharged through the decompression mechanism 213 and a situation in which the weakened region 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 structural constraints of the battery cell 20 itself. That is, when the volumetric energy density E of the battery cell 20 is constant, the melting point T1 of the material of the weak region 133 of the relief cavity 131 becomes small, which makes it more difficult to select the material and also reduces the structural strength of the relief cavity 131. During normal use of the battery 10, for example during charging and discharging, the temperature of the battery 10 may rise, and the weak region 133 of the relief cavity 131 may easily soften or melt during normal use of the battery 10, reducing the sealing performance of the relief cavity 131 and the safety of the battery 10.

[0120] On the other hand, if the value of T1 / E is too large, that is, if 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, the temperature of the effluent discharged through the pressure reduction mechanism 213 when thermal runaway occurs in the battery cell 20 will be low. If the melting point T1 of the material of the weak area 133 of the relief cavity 131 is set too high, the effluent will not melt the weak area 133 of the relief cavity 131 and will not be able to be discharged immediately, or it will take too long to melt the weak area 133 of the relief cavity 131, and the effluent will be restricted within the relief cavity 131 corresponding to the pressure reduction mechanism 213. The space of the relief cavity 131 is limited, which will cause thermal impact on the pressure reduction mechanism 213 and will easily cause thermal diffusion between the battery cells 20.

[0121] Therefore, it is not preferable that the value of T1 / E in the embodiments of the present application is set 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 present embodiment, the melting point T1 of the material of the weakened region 133 should not be set too high or too low. For example, the melting point T1 of the material of the weakened region 133 may be set in the range of [100°C, 600°C]. Furthermore, for example, the melting point T1 of the material of the weakened region 133 may be set in the range of [100°C, 400°C], so that even if thermal runaway occurs in the battery cell 20, it takes a short time for the generated effluent to destroy the weakened region 133. If the melting point T1 of the material of the weakened region 133 is set too low, the weakened region 133 may soften or melt under normal battery use conditions, affecting the sealing of the relief cavity 131. If the melting point T1 of the material of the weakened region 133 is set too high, when thermal runaway occurs in the battery cell 20, the generated effluent may not melt the weakened region 133 easily, or it may take too long for the effluent to melt the weakened region 133, which may cause thermal diffusion in the battery 10. Therefore, 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 combining 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 explained in detail above, and therefore will not be explained here to avoid duplication.

[0124] Specifically, in one embodiment, the performance test results of the battery 10 under the same experimental conditions for the weak region 133 are shown in Table 2 when the melting point T1 of the weak region 133 material and the volumetric energy density E are different.

[0125] [Table 2]

[0126] As shown in Table 2 above, the data in the first column indicate the melting point T1 of the material of the weakened region 133 in different examples and comparative examples. The data in the second column indicate the volumetric energy density E of the battery cell 20 in different examples and comparative examples. The data in the third column indicate the ratio of the melting point T1 of the weakened region 133 to the volumetric energy density E of the battery cell 20 in different examples and comparative examples. The data in the fourth column indicate the performance test results under experimental conditions simulating vibration and impact on the weakened region 133 in different examples and comparative examples. The vibration and impact simulate the action of external forces that the battery 10 may be subjected to during normal use, and the test results include a situation in which the weakened region 133 was not destroyed and a situation in which the weakened region 133 was destroyed (melting or softening occurred). The fifth column shows performance test results under experimental conditions simulating the occurrence of thermal runaway in the battery cells 20 in the weak areas 133 of different embodiments and comparative examples, and the test results include a situation in which the weak areas 133 are destroyed by the effluent discharged through the pressure reduction mechanism 213 and a situation in which the weak areas 133 are not destroyed by the effluent 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 embodiments of the present application, the implementation method of the weakened region 133 of the relief cavity 131 can be flexibly set according to actual applications. For example, setting the thickness of the weakened region 133 to be smaller than the thickness of the other regions of the relief cavity 131 facilitates processing and assembly of the battery 10. For example, if the weakened region 133 is disposed on the side wall 135 of the relief cavity 131 along the first direction, the impact force from the external environment that the bottom wall 134 of the relief cavity 131 receives is generally greater than that of the side wall 135 of the relief cavity 131 during use of the battery 10. Therefore, 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 greater than the thickness of the weakened region 133 of the side wall 135. Correspondingly, in order to ensure that the discharged material immediately and smoothly penetrates the weakened area 133 in the event of thermal runaway occurring 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 weakened region 133 can be set lower than the melting point of the material of the other regions of the relief cavity 131. This makes the weakened region 133 more sensitive to temperature than the other regions of the relief cavity 131. When the pressure reducing mechanism 213 is activated, the weakened region 133 is immediately and quickly melted by the effluent discharged from the pressure reducing mechanism 213, allowing the effluent to be quickly discharged outside the relief cavity 131, which is advantageous to improving the safety performance of the battery 10. For example, if the weak area 133 is installed on the side wall 135 of the relief cavity 131 along the first direction X, in the event of thermal runaway occurring in the battery cell 20, the bottom wall 134 of the relief cavity 131 will experience a greater thermal shock than the side wall 135 of the relief cavity 131. Therefore, 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 on the side wall 135.

[0131] The above-described methods for providing the weakened region 133 in the embodiments of the present application may be used alone or in combination. For example, the weakened region 133 in the embodiments of the present application may be improved by simultaneously adopting a combined solution of lowering the melting point of the material of the weakened region 133 and reducing the thickness of the weakened region 133, but the embodiments of the present application are not limited thereto.

[0132] 8 and 9 are enlarged views of a portion of battery 10 according to an embodiment of the present application. For example, FIGS. 8 and 9 may be enlarged views of region A of battery 10 shown in FIG. 6. As shown in FIGS. 8 and 9, the weakened region of relief cavity 131 includes through-holes 136, so that when pressure-reducing mechanism 213 is activated, effluent discharged through pressure-reducing mechanism 213 can pass through through-holes 136 and be discharged from relief cavity 131. In this embodiment, using through-holes 136 in relief cavity 131 as weakened region 133 facilitates the processing and assembly of battery 10. Furthermore, when weakened region 133 is impacted by effluent discharged from pressure-reducing mechanism 213, the effluent can be immediately and quickly discharged to the outside of relief cavity 131 through through-holes 136, which is beneficial to improving the discharge efficiency of effluent and thereby improving the safety of battery 10.

[0133] 8 and 9 , in one embodiment, the weakened 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, which is broken when the pressure-reducing mechanism 213 is activated, allowing the discharged matter from the battery cell 20 to pass through the through-hole 136. The sealing structure 137 installed in the embodiment of the present application, on the one hand, maintains the hermeticity of the relief cavity 131 during normal use of the battery cell 20 and prevents 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 thermal runaway occurs in the battery cell 20, the discharged matter discharged through the pressure-reducing mechanism 213 can quickly and smoothly break the sealing structure 137, exposing the through-hole 136, allowing the discharged matter to 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-holes 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 disposed on an inner surface corresponding to the through-hole 136 of the relief cavity 131, and / or the sealing structure 137 may be disposed 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 disposed on the inner surface corresponding to the through-hole 136 of the relief cavity 131, the sealing structure 137 is disposed close to the pressure reducing mechanism 213, and is therefore quickly destroyed by the effluent discharged from the pressure reducing mechanism 213. For example, the sealing structure 137 can quickly respond to the temperature of the battery cell 20, causing the sealing structure 137 to melt quickly, thereby avoiding affecting the operation of the pressure reducing mechanism 213 and allowing the effluent to be quickly and smoothly discharged. 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 reducing mechanism 213 can provide a deformation space for the operation of the pressure reducing mechanism 213, thereby avoiding affecting the normal function of the pressure reducing mechanism 213. In addition, when the sealing structure 137 is simultaneously installed on the inner and outer surfaces corresponding to the through hole 136 of the relief cavity 131, the sealing performance 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 facing 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 facing 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 selected 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 approximately 190°C, soluble polytetrafluoroethylene (polyfluoroalkoxy, PFA) having a melting point of approximately 300°C, polyimide (PI) having a melting point of approximately 350°C, silicone rubber (melting point approximately 350°C), fluororubber (melting point approximately 400°C), or tin (melting point approximately 232°C). Furthermore, the material of the weak region 133 of the relief cavity 131 or the region other than the sealing structure 137 in the embodiment of the present application may be an aluminum alloy (melting point approximately 660°C), but this is merely an example and the embodiment of the present application is not limited thereto.

[0139] Note that the sealing structure 137 in the embodiment of the present application may be filled in the through hole 136 in a fitted form via an adhesive, or the sealing structure 137 may be fixed via an adhesive to an inner surface of the relief cavity 131 corresponding to the through hole 136 and / or to an outer surface of the relief cavity 131 corresponding to the through hole 136. Exemplarily, the adhesive material in the embodiment of the present application may include an epoxy 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] Hereinafter, a method for installing 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. Figures 10 to 13 are each schematic cross-sectional views of a battery 10 in an embodiment of the present application. The battery 10 shown in Figures 10 to 13 may be the battery 10 shown in Figure 2, and the cross sections shown in Figures 10 to 13 are all cross sections perpendicular to the third direction Y of the battery 10. For example, the cross sections shown in Figures 10 to 13 are perpendicular to the cross section shown in Figure 3 or Figure 4, and the cross sections shown in Figures 10 to 13 are parallel to the cross section shown in Figure 6.

[0141] Optionally, as an example, the relief cavity 131 of the embodiment of the present application includes a bottom wall 134 that is installed relative to the first wall 25, and 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 along the second direction Z, 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 based on the amount of waste accumulated in different regions of the bottom wall 134 of the relief cavity 131. For example, if the bottom wall 134 of the relief cavity 131 includes a first region and a second region, and in a situation where thermal runaway occurs in the battery cell 20, and 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 relief 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 relief cavity 131, which is advantageous to improving the safety performance of the battery 10.

[0142] In the embodiment of the present application, the second direction Z is perpendicular to the first wall 25, i.e., perpendicular to the first plane on 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 the height direction of the battery cell 20.

[0143] In the embodiment of the present application, the "at least two regions" of the bottom wall 134 may refer to any region of the bottom wall 134 of the relief cavity 131. For example, taking the first and second regions included in the bottom wall 134 of the relief cavity 131 as an example, the first and second regions may be any two non-overlapping regions of the bottom wall 134. The areas of the first and second regions on the bottom wall 134 may be the same or different. In the embodiment of the present application, the distance between the first region and the first plane along the second direction Z may be the average value, maximum value, or minimum value of the distances between all points on the first region and the first plane. Correspondingly, the distance between the second region and the first plane along the second direction Z in the embodiment of the present application may also be the average value, maximum value, or minimum value of the distances 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 distance 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 distance 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, in one embodiment, the 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 in the first direction X, and / or the 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, at least a portion of the area of ​​the bottom wall 134 is inclined along the first direction X, so that the discharged material discharged through the pressure reducing mechanism 213 can be deposited in a specific area of ​​the bottom wall 134 of the release cavity 131 due to the action of gravity. For example, based on the inclination direction of the inclined area of ​​the bottom wall 134, the discharged material is concentrated and deposited 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 deposition area on the bottom wall 134 of the release cavity 131 for the discharged material, the thermal impact on the battery cell 20 is reduced and the safety of the battery 10 is improved.

[0145] Optionally, in one 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 FIGS. 10 and 11 , 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 region of the relief cavity 131 close to the center of the bottom wall 134 and the first plane is indicated by L1, and the distance between the region of the relief cavity 131 away from the center of the bottom wall 134 and the first plane is indicated by L2, where L1 is smaller than L2. Therefore, under the action of gravity, 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. Furthermore, because the size of the sidewall at the end of the relief cavity 131 along the first direction X is small, the effluent discharged through the pressure reduction 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 disposed 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, the distance in the second direction Z between the end 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, a large amount of effluent accumulates at the end position of the relief cavity 131 along the first direction X. However, there is a large space for accommodating the effluent discharged from the pressure reduction mechanism 213, which reduces the impact on the pressure reduction mechanism 213 and improves 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 region of the relief cavity 131 close to the center of the bottom wall 134 and the first plane is indicated by L3, and the distance between the region of the relief cavity 131 away from the center of the bottom wall 134 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, because the size of the sidewall at the end of the relief cavity 131 in the first direction X is small, the discharged matter discharged via the pressure reducing mechanism 213 is deposited more at the end position of the relief cavity 131 in the first direction X. Therefore, when the bottom wall 134 of the relief cavity 131 is arranged 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 matter at the end position of the relief cavity 131 along the first direction X 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 matter 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 deposition groove 138 with an opening facing the first wall 25 may be installed on the bottom wall 134 installed relative to the first wall 25 of the relief cavity 131 in the embodiment of the present application, 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 is provided in the bottom wall 134 of the relief cavity 131, with its opening facing the first wall 25. As a result, when the pressure reducing mechanism 213 is activated, a sedimentation groove of a certain depth exists in the bottom wall 134 of the relief cavity 131. This allows the sedimentation groove 138 to have a certain depth and to accommodate the waste discharged through the pressure reducing mechanism 213, preventing the waste from accumulating in other areas of the bottom wall 134, reducing the impact on the pressure reducing mechanism 213, and improving the safety of the battery 10.

[0149] Hereinafter, with reference to the drawings, 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. Figures 14 to 16 are each a schematic cross-sectional view of a battery 10 according to an embodiment of the present application. The battery 10 shown in Figures 14 to 16 may be the battery 10 shown in Figure 2, and the cross sections shown in Figures 14 to 16 are all cross-sectional views perpendicular to the third direction Y of the battery 10. For example, the cross sections shown in Figures 14 to 16 are perpendicular to the cross section shown in Figure 3 or Figure 4, and the cross sections shown in Figures 14 to 16 are parallel to the cross section shown in Figure 6 and the cross sections shown in Figures 10 to 13.

[0150] 14 to 16, one or more deposition grooves 138 are provided in the bottom wall 134 of the embodiment of the present application, and for any one deposition groove 138, the depth H1 of the deposition groove 138 is greater than the depth H2 of the area of ​​the bottom wall 134 other than the deposition groove 138. The depth H1 of the deposition groove 138 is the distance along the second direction Z between the bottom wall of the deposition groove 138 and the first wall 25, and the depth H2 of the area of ​​the bottom wall 134 other than the deposition 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 deposition groove 138 in the embodiment of the present application may be the average value, maximum value, or minimum value of the distance between all points on the bottom wall of the deposition 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 deposition groove 138 may be the average value, maximum value, or 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 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 FIGS. 14 and 15 , the deposition groove 138 on the bottom wall 134 of the relief cavity 131 is located at the end of the bottom wall 134 in the first direction X. In the present embodiment, because the sidewall size of the end of the relief cavity 131 in the first direction X is small, the high-temperature and high-pressure effluent discharged through the pressure reducing mechanism 213 is more likely to accumulate at the sidewall portion of the end of the relief cavity 131 in the first direction X. The deposition groove 138 is located at the end of the bottom wall 134 of the relief cavity 131 in the first direction X. On the one hand, the deposition groove 138 can accommodate the effluent, and most of the effluent accumulates in the deposition groove 138. On the other hand, the depth of the deposition groove 138 can reduce the thermal impact of the effluent on the battery cells 20, avoiding the occurrence of thermal diffusion and improving the safety of the battery 10.

[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 on the bottom wall 134 of the relief cavity 131 in the embodiments of the present application. In the embodiment of the present application, multiple deposition grooves 138 can be provided in different areas of the bottom wall 134 of the relief cavity 131 based on the amount of effluent accumulated in different areas of the bottom wall 134. The deposition grooves 138 have a certain depth and can accommodate the effluent discharged through the pressure reducing mechanism 213. Because the deposition grooves 138 are deep, when thermal runaway occurs in the battery cell 20, the deposition grooves 138 can be provided in multiple specific areas of the bottom wall 134 of the relief cavity 131 where there is a large amount of effluent. This can effectively prevent the effluent in the multiple specific areas from affecting the corresponding pressure reducing mechanism 213. This can avoid thermal diffusion caused by the effluent accumulating in the relief cavity 131. In other words, by controlling the effluent to be located in specific deposition grooves 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 include a plurality of deposition grooves 138 arranged at intervals along the first direction X, and the 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 activated, the discharged matter discharged through the pressure reduction mechanism 213 of the battery cell 20 can be deposited in the corresponding deposition groove 138, thereby avoiding thermal effects on other battery cells 20, preventing 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, setting the depths of the plurality of sedimentation grooves 138 to be the same facilitates processing and installation of the battery 10. 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 areas on the bottom wall 134, i.e., the depths of the plurality of sedimentation grooves 138 do not have to be equal. For example, since the size of the side wall 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 side wall of the end of the relief cavity 131 along the first direction X, and therefore a deep deposition groove 138 is provided in the relief cavity 131 near the end along the first direction X, and a shallow deposition groove 138 is provided in the relief cavity 131 near the center position of the bottom wall 134.

[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 be 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 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 ranges from [0.1 mm to 25 mm], and further, for example, the value 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 ranges from [3 mm to 20 mm]. If the distance H1 is set too small, it will be difficult to meet the actual needs of the battery 10. When thermal runaway occurs in a battery cell 20, the waste material discharged through the pressure reducing mechanism 213 will accumulate excessively in the deposition groove 138. If the distance between the waste material and the first wall 25 of the battery cell 20 is too small, it will affect the corresponding battery cell 20, and heat diffusion will easily occur between the multiple battery cells 20 corresponding to the deposition groove 138, which will also thermally affect other adjacent battery cells 20 and reduce the safety of the battery 10. If the distance H1 is set too large, the space utilization rate within the battery 10 will decrease and the processing costs 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 combining any two of the above values.

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

Claims

1. The battery pack 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 reducing mechanism (213) is installed in at least two battery cells (20) among the plurality of battery cells (20), and the pressure reducing mechanism (213) is installed in a first wall (25) of the battery cell (20); the support member (13) is attached to the first wall (25) to support the battery cells (20), the support member (13) includes at least one relief cavity (131) corresponding to at least two pressure reduction mechanisms (213) in the battery cell module (200), each of the at least one relief cavity (131) covers a set of the at least two pressure reduction mechanisms (213), and each of the at least one relief cavity (131) is used to provide a deformation space for operation of the set of the at least two pressure reduction mechanisms (213).

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

3. 3. The battery according to claim 2, wherein when the pressure reducing mechanism (213) is activated, 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).

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

5. 4. The battery according to claim 3, wherein 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 relief 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) is located opposite the first wall (25), the side wall (135) is connected to the bottom wall (134) and extends toward the first wall (25), and the weakened area (133) is located on the bottom wall (134) and / or the side wall (135).

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

9. The weakened area (133) satisfies the following: [0014] 7. The battery of claim 6, wherein 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: [Equation 15] 7. The battery of claim 6, wherein T1 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. 7. The battery of claim 6, wherein the thickness of the weakened area (133) is less than the thickness of the area of ​​the relief cavity (131) other than the weakened area (133).

12. 7. The battery according to claim 6, wherein the melting point of the material of the weakened area (133) is lower than the melting point of the material of the area of ​​the relief cavity (131) other than the weakened area (133).

13. 6. The battery of claim 5, wherein the weakened 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 discharged matter of the battery cell (20) to penetrate through the through-hole (136).

15. 15. The battery according to 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, wherein the sealing structure (137) is installed on an outer surface of the relief cavity (131) corresponding to the through hole (136).

17. 2. The battery of claim 1, wherein the relief cavity (131) includes a bottom wall (134) disposed opposite the first wall (25), and along a second direction, distances between at least two regions of the bottom wall (134) and a first plane on 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, the distance along the second direction between at least a portion of the bottom wall (134) and the first plane gradually decreases.

19. 19. 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 the center of the bottom wall (134) toward the end of the bottom wall (134).

20. 18. The battery of claim 17, wherein the bottom wall (134) includes an arcuate surface and / or a flat surface.

21. 18. The battery of claim 17, wherein the bottom wall (134) is provided with a precipitation groove (138) having an opening facing the first wall (25), and the distance between the bottom wall of the precipitation groove (138) and the first plane along the second direction is greater than the distance between the area of ​​the bottom wall (134) other than the precipitation groove (138) and the first plane.

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

23. 22. The battery of claim 21, wherein the bottom wall (134) is provided with a plurality of the deposition grooves (138) arranged at intervals along the first direction.

24. a collection cavity (11b) for collecting discharged matter from the battery cell (20) when the pressure reducing mechanism (213) is activated; 2. The battery according to claim 1, wherein said support member (13) is further used to separate said collecting cavity (11b) and said electrical cavity (11a).

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

26. 2. The battery according to claim 1, wherein 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 discharged matter from the battery cells (20) to pass through the support member (13) and be discharged from the housing (11) when the pressure reducing mechanism (213) is activated.

27. 10. The battery of claim 1, 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 used to supply electrical energy to said power consuming device.

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