Batteries and power-consuming devices

Abstract

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

Description

[Technical Field]

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

[0002] With the continuous advancements in battery technology, various new energy industries that utilize batteries as energy storage devices are rapidly developing. In the development of battery technology, in addition to improving battery performance, safety issues are also one that cannot be ignored. If battery safety cannot be ensured, the battery cannot be used. Therefore, how to improve battery safety is one of the technical problems that must be solved urgently in battery technology. [Overview of the project]

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

[0004] According to a first embodiment, a battery is provided, comprising a housing including an electrical cavity, a battery cell housed in the electrical cavity, the battery cell having a pressure relief mechanism installed on its first wall, and an attachment structure attached to the first wall, the attachment structure having a relief region, the relief region being used to provide deformation space for the pressure relief mechanism of at least one of the battery cells, the relief region satisfying 0.3 ≤ S2 / (n*S1) ≤ 8.5, where S1 is the projected area of ​​the pressure relief mechanism in the direction perpendicular to the first wall, S2 is the projected area of ​​the relief region in the direction perpendicular to the first wall, n is the number of pressure relief mechanisms corresponding to the relief region, and n is a positive integer.

[0005] Therefore, by reasonably setting the area of the escape region of the accessory structure, the battery of the embodiment of the present application can improve the safety of the battery. Specifically, if the setting of S2 / (n*S1) is too small, although the area of the pressure relief mechanism is relatively large, there may be a situation where the area of the escape region corresponding to this pressure relief mechanism is relatively small. In this way, on the one hand, this escape region may not be able to provide sufficient deformation space for the pressure relief mechanism, whereby at least a part of the pressure relief mechanism is shielded by the escape region and cannot operate normally, and furthermore, the discharge inside the battery cell cannot be discharged in a timely manner. On the other hand, when the pressure relief mechanism can operate normally, due to the relatively small area of the escape region, there may be a situation where the discharge cannot quickly pass through this escape region and be discharged. That is, there is a discharge bottleneck in this escape region, and similarly, the discharge inside the battery cell cannot be discharged in a timely manner. Therefore, both of these situations may cause heat diffusion after the battery cell undergoes thermal runaway, further causing the explosion of the battery and affecting the safety of the battery.

[0006] Conversely, if the setting of S2 / (n*S1) is too large, there may be a situation where the area of the pressure relief mechanism is too small, or the area of the escape region corresponding to this pressure relief mechanism is too large. If the area of the pressure relief mechanism is too small, the discharge inside the battery cell cannot be discharged from the battery cell in a timely and rapid manner, and furthermore, it will cause heat diffusion after the battery cell undergoes thermal runaway, further causing the explosion of the battery and affecting the safety of the battery. If the area of the escape region is too large, it will reduce the rigidity and strength of the accessory structure where this escape region is located, affecting the performance of this accessory structure. For example, it may affect the supporting effect of this accessory structure on the battery cell.

[0007] In some embodiments, this escape region satisfies 0.8 ≦ S2 / (n*S1) ≦ 4, thereby rationalizing the setting of the area of the pressure relief mechanism, facilitating timely discharge of the emissions of the battery cell through this pressure relief mechanism, preventing the area of the escape region from being too small, further avoiding affecting the normal operation of the pressure relief mechanism and the discharge of emissions, and also preventing the area of the escape region from being too large, ensuring the strength and rigidity of the attached structure where this escape region is located, and further improving the safety and stability of the battery.

[0008] In some embodiments, the range of the value of the projected area S1 of this pressure relief mechanism in the direction perpendicular to this first wall is [50 mm 2 , 3000 mm 2 . If the setting of the area S1 is too large, the area of the pressure relief mechanism located on the first wall is too large, reducing the strength of this first wall, that is, reducing the strength of the housing of the battery cell, and further affecting the structural strength and stability of this battery cell. Conversely, if the setting of the area S1 is too small, the area of this pressure relief mechanism is too small. When the battery cell undergoes thermal runaway, emissions need to be discharged through this pressure relief mechanism. Therefore, if the area of the pressure relief mechanism is too small, the emissions of the battery cell cannot be discharged in a timely manner, causing heat diffusion between battery cells and further potentially causing an explosion of the battery.

[0009] In some embodiments, the projected area S2 of this escape region in the direction perpendicular to this first wall is 50 mm 2 ≦ S2 / n ≦ 10000 mm 2The following conditions must be met. If the value of S2 / n is set too high, the area of ​​the region corresponding to one of the pressure release mechanisms in this relief region will be too large, increasing the total area of ​​the relief region on this attached structure, and further affecting the strength of this attached structure, for example, affecting the support function of this attached structure for the battery cells, and further affecting the structural strength and stability of the battery. Conversely, if the value of S2 / n is set too low, the area of ​​the region corresponding to one of the pressure release mechanisms in this relief region will be too small, potentially shielding at least some of the pressure release mechanisms, further affecting the normal operation of these pressure release mechanisms, and failing to provide sufficient deformation space for these mechanisms, thereby affecting the discharge of waste from the battery cells, making it easier to cause heat diffusion between battery cells, and further potentially causing the battery to explode.

[0010] In some embodiments, this relief region corresponds to multiple pressure relief mechanisms. By making each relief region correspond to multiple pressure relief mechanisms, the number of relief regions to be installed can be reduced, making it easier to manufacture, and reducing the difficulty of assembly as it is not necessary to have a one-to-one correspondence between the pressure relief mechanisms and the relief regions during assembly.

[0011] In some embodiments, the electrical cavity includes a second wall, the first wall facing the second wall. The pressure relief mechanism of the battery cells faces the second wall of the electrical cavity and not other battery cells, thereby facilitating the installation of relief structures in the walls of the electrical cavity and providing relief space for deformation of the pressure relief mechanism, improving the space utilization rate of the battery and reducing the risk that a thermally runaway battery cell will cause thermal runaway in other battery cells, thereby improving the safety of the battery.

[0012] In some embodiments, this attachment structure includes this second wall. By rationally setting the size of the escape area in this second wall, waste can be discharged in a timely and rapid manner, preventing heat diffusion and explosion, and improving the safety of the battery.

[0013] In some embodiments, the relief region includes a through-hole penetrating the second wall, with the penetrating direction being the thickness direction of the second wall, and the through-hole is used to allow waste discharged from the pressure relief mechanism to be discharged from the electrical cavity through the through-hole when the pressure relief mechanism is in operation. The relief region includes a through-hole installed in the second wall, which is easy to machine on the one hand, and on the other hand, the through-hole provides deformation space for the pressure relief mechanism and also allows waste discharged from the pressure relief mechanism to be rapidly discharged through the through-hole.

[0014] In some embodiments, a sealing structure is installed in this second wall to seal the through-hole, and this sealing structure is destroyed when the pressure relief mechanism is activated, allowing the discharge to pass through the through-hole.

[0015] If this relief area includes a through-hole, it may expose the pressure release mechanism, which in turn makes the mechanism more susceptible to external environmental influences during battery use and could potentially lead to its failure. Therefore, the installed seal structure can, on the one hand, maintain the sealing performance of the electrical cavity during normal use of the battery cell and protect the pressure release mechanism from external environmental influences, and on the other hand, if thermal runaway occurs in the battery cell, this seal structure can be destroyed in a timely manner, exposing the through-hole, allowing the battery cell's waste to be discharged through this through-hole from the electrical cavity, thus avoiding thermal runaway and improving battery safety.

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

[0017] In some embodiments, this relief region includes a groove in which the opening of the second wall faces the pressure relief mechanism, and this groove is used to break when the pressure relief mechanism is in operation, allowing the discharged material from the pressure relief mechanism to pass through the second wall and be discharged from the electrical cavity. The opening of the groove faces the pressure relief mechanism, and the interior of the groove can provide a deformation space for the pressure relief mechanism, thereby facilitating the operation of the pressure relief mechanism and the discharge of material.

[0018] In some embodiments, the battery further includes a connecting structure installed between the first wall and the second wall, and the attached structure includes this connecting structure. By installing the connecting structure between the first wall and the second wall, on the one hand, when thermal runaway is not occurring in the battery cell, this connecting structure can provide relative fixation between the first wall and the second wall and sealing between the first wall and the second wall, and on the other hand, the attached structure may include this connecting structure, that is, this connecting structure includes a relief region, which can avoid shielding the pressure release mechanism of this connecting structure, thereby allowing discharge of waste to proceed smoothly.

[0019] In some embodiments, the connection structure is provided with a relief opening corresponding to the pressure relief mechanism, and the relief region includes this relief opening. The relief opening can provide a deformation space when the pressure relief mechanism is operating, thereby preventing the connection structure from obstructing the pressure relief mechanism and delaying its operation, and allowing the discharged material through the pressure relief mechanism to be quickly discharged through the relief opening.

[0020] In some embodiments, this connection structure is used to prevent waste discharged from the pressure relief mechanism from entering the electrical cavity when the pressure relief mechanism is operating. This connection structure may also serve as a sealant, and in particular, when the pressure relief mechanism is operating, the connection structure is positioned between the first wall and the second wall, preventing waste from entering the electrical cavity through this connection structure. In this way, waste that has passed through the pressure relief mechanism can be discharged directly from the electrical cavity through the relief opening and the second wall of the connection structure, respectively, preventing short circuits in the battery cells of the electrical cavity and causing heat diffusion and ultimately explosion after the waste enters the electrical cavity. Furthermore, the waste can be collected intensively, making it easier to process the waste intensively, avoiding the waste affecting other components in the battery, and improving the safety of the battery.

[0021] In some embodiments, this connection structure is used to discharge waste from the pressure relief mechanism into the electrical cavity when the pressure relief mechanism is operating. This connection structure reduces the sealing requirements and is easy to implement. It allows some waste to be discharged into the electrical cavity through the connection structure, while some waste is discharged from the electrical cavity through the connection structure and the second wall, thereby increasing the discharge rate and reducing the risk of battery explosion. It also enables directional and dispersed discharge, avoiding the impact of waste on other components and improving the safety and stability of the battery.

[0022] In some embodiments, the connection structure is provided with a channel for discharging waste discharged from the pressure relief mechanism into the electrical cavity when the pressure relief mechanism is operating. The waste discharged through the pressure relief mechanism can be discharged into the electrical cavity via the channel, and by rationally positioning the channel in this way, directional discharge of the waste can be achieved, reducing the impact of the waste on individual components within the electrical cavity and further improving the safety of the battery.

[0023] In some embodiments, this connection structure is used to break when the pressure relief mechanism is activated, forming a gap between the first wall and the second wall, which is used to discharge waste from the pressure relief mechanism into the electrical cavity. By rationally selecting the material of the connection structure, an appropriate melting point for the connection structure can be obtained, so that the connection structure breaks when the pressure relief mechanism is activated, further forming a gap and thereby discharging waste into the electrical cavity, thus eliminating the need to install additional structures in the connection structure, making it simpler and also ensuring the sealing performance of the battery cell during normal use.

[0024] In some embodiments, the battery further includes a collection cavity for collecting waste from the battery cells when the pressure release mechanism is operating. This collection cavity can intensively collect and / or process the waste and further discharge it outside the battery. For example, the collection cavity may contain a liquid such as a cooling medium, or a component containing this liquid may be installed to further cool the waste entering the collection cavity.

[0025] In some embodiments, the battery further includes an isolation member for isolating the electrical cavity from the collection cavity. By isolating the electrical cavity from the collection cavity using the isolation member, that is, the electrical cavity housing the battery cells and busbar members and the collection cavity collecting waste are separated to avoid mutual influence between the two.

[0026] In some embodiments, this isolation member is formed as at least part of the second wall. Thus, the discharged material after passing through the pressure relief mechanism may be discharged from the electrical cavity through the isolation member, or it may be discharged directly into, for example, the collection cavity.

[0027] According to a second embodiment, a power-consuming device is provided, which includes a battery as described in the first embodiment, and which is for providing electrical energy to the power-consuming device.

[0028] In some embodiments, the power-consuming device is a vehicle, a ship, or an aerospace aircraft. [Brief explanation of the drawing]

[0029] [Figure 1] This is a schematic diagram of the structure of a vehicle disclosed in one embodiment of this application. [Figure 2] This is a schematic diagram of the structure of a battery disclosed in one embodiment of this application. [Figure 3] This is a schematic diagram of the disassembled structure of a battery disclosed in one embodiment of this application. [Figure 4] This is a schematic diagram of the local structure of a battery disclosed in one embodiment of this application. [Figure 5] This is a schematic diagram of the local structure of another battery disclosed in one embodiment of this application. [Figure 6] This is a schematic diagram of the local structure of yet another battery disclosed in one embodiment of this application. [Figure 7] This is a schematic diagram of the structure of another battery disclosed in one embodiment of this application. [Figure 8] This is a schematic diagram of the structure of yet another battery disclosed in one embodiment of this application. [Figure 9] This is a schematic diagram of the disassembled structure of another battery disclosed in one embodiment of this application. [Figure 10] This is a schematic diagram of the local structure of another battery disclosed in one embodiment of this application.

[0030] In drawings, the drawings are not drawn to the actual scale. [Modes for carrying out the invention]

[0031] The embodiments of this application will be described in more detail below, linking them with the drawings and examples. The detailed descriptions of the embodiments and drawings below are for illustrative purposes to illustrate the principles of this application, but are not intended to limit the scope of this application; in other words, this application is not limited to the embodiments described.

[0032] In the description of this application, unless otherwise specified, the meaning of "multiple" is two or more. The directions or positional relationships indicated by terms such as "up," "down," "left," "right," "inside," and "outside" are merely for the convenience and simplification of the description in this application and do not indicate or imply that the mentioned devices or elements have a specific direction or must be configured and operated in a specific direction, and should not be understood as limitations on this application. Furthermore, terms such as "first," "second," and "third" are used solely for descriptive purposes and should not be understood as indicating or implying relative importance. "Perpendicular" does not mean perpendicular in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range.

[0033] The directional terms appearing in the following description all refer to the directions shown in the diagrams and do not limit the specific structure of this application. Furthermore, unless explicitly defined or limited, the terms “attachment,” “connection,” and “connection” in this application should be understood in a broad sense, and may include, for example, a fixed connection, a removable connection, or an integral connection; a direct connection or an indirect connection via an intermediate medium. Those skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0034] In the embodiments of this application, the same reference numerals indicate the same component, and for the sake of brevity, detailed descriptions of the same component are omitted in different embodiments. It should be understood that the dimensions such as thickness, aspect ratio of various components in the embodiments of this application shown in the drawings, and the dimensions such as thickness, aspect ratio of the overall assembly device, are illustrative only and do not constitute any limitation of this application.

[0035] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flattened, rectangular, or have other shapes, and the embodiments of this application are not limited thereto. Battery cells are generally classified into three types based on their packaging: cylindrical battery cells, rectangular battery cells, and pouch battery cells, and the embodiments of this application are not limited thereto.

[0036] The battery referred to in the embodiments of this application is a single physical module comprising one or more battery cells that provides 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 matter from affecting the charging or discharging of the battery cells.

[0037] A battery cell includes an electrode assembly and an electrolyte, and the electrode assembly consists of a positive electrode plate, a negative electrode plate, and a separator. The battery cell operates mainly by the movement of metal ions between the positive and negative electrode plates. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer being coated on the surface of the positive electrode current collector, the current collector without the positive electrode active material layer protruding from the current collector with the positive electrode active material layer, and the current collector without the positive electrode active material layer being called a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode plate 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. Current collectors without the negative electrode active material layer protrude from current collectors with the negative electrode active material layer, and these current collectors without the negative electrode active material layer are designated as negative electrode tabs. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. Multiple positive electrode tabs are stacked to prevent melting even when a large current is applied, and multiple negative electrode tabs are stacked. The separator material may be polypropylene (PP) or polyethylene (PE), etc. The electrode assembly may have a wound structure or a laminated structure, and the embodiments of this application are not limited to these.

[0038] The development of battery technology requires the simultaneous consideration of a wide range of design elements, such as energy density, cycle life, discharge capacity, and charge / discharge ratio, as well as battery safety. The main safety risks for batteries stem from the charging and discharging processes. To improve battery safety, battery cells are generally equipped with pressure relief mechanisms. A pressure relief mechanism is an element or component that activates when the internal pressure or temperature of the battery cell reaches a predetermined threshold to release that internal pressure or temperature. This predetermined threshold may be adjusted according to different design requirements. For example, this threshold may depend on one or more materials among the positive electrode plate, negative electrode plate, electrolyte, and separator in the battery cell. The pressure relief mechanism may employ pressure-sensitive or temperature-sensitive elements or components; that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism activates to form a passage through which the internal pressure or temperature can be released.

[0039] In the case of a pressure relief mechanism, a certain deformation space is required when it operates. This deformation space is the space inside or outside the pressure relief mechanism in the direction of operation (i.e., the direction of failure) when the pressure relief mechanism operates (for example, when at least a part of the pressure relief mechanism is destroyed). Therefore, how this deformation space is positioned is particularly important for this pressure relief mechanism.

[0040] Embodiments of this application provide a battery and a power-consuming device, the battery comprising a housing, battery cells and an attached structure, wherein the battery cells are housed in an electrical cavity of the housing, a pressure relief mechanism is installed on the first wall of the battery cells, and the attached structure is attached to the first wall. A relief region is provided in the attached structure, which can provide deformation space for the pressure relief mechanism of at least one battery cell, and the relief region satisfies 0.3 ≤ S2 / (n*S1) ≤ 8.5, where S1 is the projected area of ​​the pressure relief mechanism in the direction perpendicular to the first wall, S2 is the projected area of ​​the relief region in the direction perpendicular to the first wall, n is the number of pressure relief mechanisms corresponding to the relief region, and n is a positive integer. By rationally setting the size of the area of ​​this relief region, the safety of the battery can be improved.

[0041] If the setting of S2 / (n*S1) is too small, there may be a situation where the area of ​​the pressure release mechanism is relatively large, but the area of ​​the relief region corresponding to this pressure release mechanism is relatively small. In this way, on the one hand, this relief region may not be able to provide sufficient deformation space for the pressure release mechanism, and as a result, at least a part of the pressure release mechanism may be shielded by the relief region, preventing it from operating normally, and furthermore, the discharge of waste from inside the battery cell will not be expelled in a timely manner. On the other hand, if the pressure release mechanism operates normally, because the area of ​​the relief region is relatively small, the waste may pass through this relief region quickly and not be expelled. In other words, a discharge bottleneck exists in this relief region, and similarly, the waste from inside the battery cell will not be expelled in a timely manner. Therefore, in both of these situations, thermal diffusion may occur after the battery cell experiences thermal runaway, further causing the battery to explode and affecting the safety of the battery.

[0042] Conversely, if the setting of S2 / (n*S1) is too large, there is a possibility that the area of ​​the pressure release mechanism is too small, or that the area of ​​the relief region corresponding to this pressure release mechanism is too large. If the area of ​​the pressure release mechanism is too small, waste products inside the battery cell will not be discharged from the battery cell in a timely and rapid manner, and furthermore, after the battery cell experiences thermal runaway, it will cause thermal diffusion, which may lead to the battery exploding and affect the safety of the battery. If the area of ​​the relief region is too large, it will reduce the rigidity and strength of the attached structure where this relief region is located, affecting the performance of this attached structure, and for example, it may affect the support function of this attached structure for the battery cell.

[0043] The technical solutions described in the embodiments of this application are applicable to a variety of power-consuming devices that use batteries.

[0044] Power-consuming devices may include vehicles, mobile phones, portable devices, laptop computers, ships, aerospace vehicles, electric toys, and power tools. Vehicles may be fuel-powered vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or range-extender vehicles. Aerospace vehicles include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiments of this application do not particularly limit the power-consuming devices described above.

[0045] In the following embodiments, for the sake of explanation, we will use a vehicle as an example of the power-consuming device.

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

[0047] To meet different power usage demands, a battery may include multiple battery cells, which may be connected in series, in parallel, or in a series-parallel configuration, where series-parallel is a combination of series and parallel connections. The battery may also be called a battery pack. For example, multiple battery cells may first be connected in series, in parallel, or in a series-parallel configuration to form a battery module, and these battery modules may then be further connected in series, in parallel, or in a series-parallel configuration to form a battery. In other words, multiple battery cells may directly form a battery, or they may first form battery modules, and then the battery modules may form a battery.

[0048] Figure 2 shows a schematic diagram of the structure of the battery 10 according to the embodiment of this application. Figure 3 shows a schematic diagram of the exploded structure of the battery 10 according to the embodiment of this application, and for example, the battery 10 shown in Figure 3 may be the battery 10 shown in Figure 2. As shown in Figures 2 and 3, the battery 10 according to the embodiment of this application includes a housing 11 including an electrical cavity 11a, a battery cell 20 housed in the electrical cavity 11a, the battery cell 20 having a pressure relief mechanism 211 installed on a first wall 21 of the battery cell 20, and an attachment structure 13 attached to the first wall 21, the attachment structure 13 having a relief region 131, the relief region 131 being used to provide deformation space for the pressure relief mechanism 211 of at least one of the battery cell 20, and the relief region 131 satisfying 0.3 ≤ S2 / (n*S1) ≤ 8.5. Here, S1 is the projected area of ​​the pressure relief mechanism 211 in the direction perpendicular to the first wall 21, S2 is the projected area of ​​the relief region 131 in the direction perpendicular to the first wall 21, n is the number of pressure relief mechanisms 211 corresponding to the relief region 131, and n is a positive integer.

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

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

[0051] As used in this application, “operation” refers to the operation or activation of the pressure release mechanism 211 to a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. Possible operations of the pressure release mechanism 211 may include, but are not limited to, rupture, shattering, tearing, or opening of at least a portion of the pressure release mechanism 211. When the pressure release mechanism 211 is operated, the high-temperature, high-pressure material inside the battery cell 20 is discharged as waste from the activated part. This method allows for pressure and temperature release in the battery cell 20 under controllable pressure or temperature, thereby avoiding the occurrence of potential and more serious accidents.

[0052] The emissions from the battery cell 20 referred to in this application include, but are not limited to, the electrolyte, dissolved or fragmented positive and negative electrode plates, separator fragments, high-temperature and high-pressure gases generated by the reaction, and flames.

[0053] The pressure relief mechanism 211 in the embodiment of this application is installed on the first wall 21 of the battery cell 20, and the pressure relief mechanism 211 may be part of the first wall 21, or it may be a separate structure from the first wall 21, or it may be fixed to the first wall 21 by means of welding, for example. For example, if the pressure relief mechanism 211 is part of the first wall 21, the pressure relief mechanism 211 may be formed by making a cut in the first wall 21, and the thickness of the first wall 21 corresponding to this cut is smaller than the thickness of the area of ​​the pressure relief mechanism 211 other than the cut. The cut is the weakest point of the pressure relief mechanism 211. When the amount of gas generated by the battery cell 20 becomes too large and the internal pressure rises to a threshold, or when heat is generated by a reaction inside the battery cell 20 and the internal temperature rises to a threshold, the pressure release mechanism 211 ruptures at the notch, causing communication between the inside and outside of the battery cell 20. The gas pressure and temperature are released to the outside by the rupture of the pressure release mechanism 211, further preventing the battery cell 20 from exploding.

[0054] Furthermore, for example, the pressure relief mechanism 211 may be a separate structure from the first wall 21, and the pressure relief mechanism 211 can take the form of an explosion-proof valve, air valve, pressure relief valve or safety valve, and can specifically employ a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 211 performs an action, or a vulnerable structure provided in the pressure relief mechanism 211 is destroyed, thereby forming an opening or passage for releasing the internal pressure or temperature.

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

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

[0057] Specifically, if the setting of S2 / (n*S1) is too small, for example, less than 0.3, there is a possibility that the area of ​​the pressure release mechanism 211 is relatively large, but the area of ​​the relief region 131 corresponding to this pressure release mechanism 211 is relatively small. In this way, on the one hand, this relief region 131 may not be able to provide sufficient deformation space for the pressure release mechanism 211, and as a result, at least a part of the pressure release mechanism 211 may be shielded by the relief region 131, preventing it from operating normally, and furthermore, the discharged material inside the battery cell 20 will not be discharged in a timely manner. On the other hand, if the pressure release mechanism 211 can operate normally, because the area of ​​the relief region 131 is relatively small, the discharged material may pass through this relief region 131 quickly and not be discharged. That is, a discharge bottleneck exists in this relief region 131, and similarly, the discharged material inside the battery cell 20 will not be discharged in a timely manner. Therefore, in both of these situations, thermal diffusion may occur after the battery cell 20 experiences thermal runaway, further causing the battery 10 to explode and affecting the safety of the battery 10.

[0058] Conversely, if the setting of S2 / (n*S1) is too large, for example, greater than 8.5, there is a possibility that the area of ​​the pressure release mechanism 211 is too small, or that the area of ​​the relief region 131 corresponding to the pressure release mechanism 211 is too large. If the area of ​​the pressure release mechanism 211 is too small, the waste products inside the battery cell 20 will not be discharged from the battery cell 20 in a timely and rapid manner, and furthermore, after the battery cell 20 experiences thermal runaway, it will cause thermal diffusion, which may lead to the explosion of the battery 10 and affect the safety of the battery 10. If the area of ​​the relief region 131 is too large, it will reduce the rigidity and strength of the attached structure 13 where this relief region 131 is located, affecting the performance of the attached structure 13, and for example, it may affect the support function of the attached structure 13 for the battery cell 20.

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

[0060] Figures 4 to 6 show schematic diagrams of several possible local structures of the battery 10 according to embodiments of this application. As shown in Figures 4 to 6, here we take the example that the electrical cavity 11a of the housing 11 of the battery 10 contains a plurality of battery cells 20. Specifically, the electrical cavity 11a may contain a plurality of sets of battery cells 20 arranged along a second direction Y, for example, Figures 4 to 6 take the example that the electrical cavity 11a contains two sets of battery cells 20, and each set of battery cells 20 contains a plurality of battery cells 20 arranged along a first direction X, for example, Figures 4 to 6 take the example that each set of battery cells 20 contains eight battery cells 20. It should be understood that the first direction X is perpendicular to the second direction Y, and the embodiments of this application take the example that both this first direction X and the second direction Y are perpendicular to a third direction Z, where this third direction Z may be the height direction of the housing 11 of the battery 10.

[0061] As shown in Figures 4 to 6, in order to clearly show the correspondence between the pressure release mechanism 211 of the battery cell 20 and the relief region 131 of the attached structure 13, only schematic diagrams of one set of battery cells 20 are shown in Figures 4 to 6, and the other set of battery cells 20 is not shown. Specifically, in the embodiments of this application, the projection of the pressure release mechanism 211 in a direction perpendicular to the first wall 21 is marked as 211', for example, in the embodiments of this application, the direction perpendicular to the first wall 21 is taken as the third direction Z, and the projection 211' of this pressure release mechanism 211 in the direction perpendicular to the first wall 21 of the attached structure 13 is taken as an example. Similarly, if the projection of the relief region 131 in a direction perpendicular to the first wall 21 is taken as the projection of the attached structure 13, then this projection is the relief region 131 itself, and therefore, in this application, the projection of the relief region 131 in a direction perpendicular to the first wall 21 is still marked as 131.

[0062] It should be understood that the attached structure 13 of the embodiment of this application may be provided with at least one relief region 131, and each relief region 131 may correspond to the pressure release mechanism 211 of at least one battery cell 20, and the embodiment of this application takes the example of providing one pressure release mechanism 211 for each battery cell 20.

[0063] Selectively, as shown in Figure 4, a plurality of relief regions 131 may be provided on the attached structure 13 of the embodiment of this application, and the plurality of relief regions 131 correspond one-to-one with the pressure release mechanisms 211 of the plurality of battery cells 20, that is, each relief region 131 corresponds to one pressure release mechanism 211. In this way, one relief region 131 corresponding to each pressure release mechanism 211 may be provided, and there may not be a corresponding relief region 131 between adjacent pressure release mechanisms 211, thereby saving the total area of ​​relief regions 131 on the attached structure 13, and further increasing the strength and rigidity of the attached structure 13, thereby improving the stability of the battery 10.

[0064] Selectively, unlike in Figure 4, as shown in Figure 5, at least one relief region 131 may be installed in the attached structure 13 of the embodiment of this application, and each relief region 131 corresponds to a plurality of pressure relief mechanisms 211. In this way, each relief region 131 can be made to correspond to a plurality of pressure relief mechanisms 211, thereby reducing the number of relief regions 131 to be installed, making it easier to manufacture, and reducing the difficulty of assembly as it is not necessary to make a one-to-one correspondence between the pressure relief mechanisms 211 and the relief regions 131 during assembly.

[0065] Selectively, as shown in Figures 5 and 6, multiple relief regions 131 may be installed in the attached structure 13, and each relief region 131 may correspond to one or more pressure relief mechanisms 211, and the number of pressure relief mechanisms 211 corresponding to different relief regions 131 may be the same or different. Specifically, as shown in Figure 5, the number of pressure relief mechanisms 211 corresponding to multiple relief regions 131 may be the same, for example, each relief region 131 may correspond to a pressure relief mechanism 211 of a set of battery cells 20, making it easy to manufacture. Alternatively, as shown in Figure 6, the number of pressure relief mechanisms 211 corresponding to multiple relief regions 131 may vary. For example, if there are many sets of battery cells 20 arranged along the first direction X, the multiple relief regions 131 may be arranged to correspond to one set of battery cells 20. The number of pressure relief mechanisms 211 corresponding to each relief region 131 may vary, thereby reducing the total area of ​​the relief regions 131 of the attached structure 13, improving the strength and rigidity of the attached structure 13, and improving the stability of the battery 10.

[0066] As shown in Figures 2 to 6, the shape of the relief region 131 in the embodiment of this application may be set according to the actual application. For example, the shape of the relief region 131 may be set according to the shape and number of corresponding pressure relief mechanisms 211. For example, if the relief region 131 corresponds one-to-one with a pressure relief mechanism 211, the shape of the relief region 131 may be the same as that of the pressure relief mechanism 211. Furthermore, for example, if the relief region 131 corresponds to multiple pressure relief mechanisms 211, the relief region 131 may be set to a rectangle, which is easier to manufacture, but the embodiment of this application is not limited thereto.

[0067] It should be understood that, as shown in FIGS. 2 to 6, the range of the value of the area S1 of the projection 211' in the direction perpendicular to the first wall 21 of the pressure relief mechanism 211 may be set according to the actual application. For example, if the setting of the area S1 is too large, the area of the pressure relief mechanism 211 located on the first wall 21 is too large, reducing the strength of this first wall 21, that is, reducing the strength of the housing of the battery cell 20, and further affecting the structural strength and stability of this battery cell 20. Conversely, if the setting of the area S1 is too small, the area of this pressure relief mechanism 211 is too small. When the battery cell 20 undergoes thermal runaway, it is necessary to discharge the exhaust through this pressure relief mechanism 211. Therefore, if the area of the pressure relief mechanism 211 is too small, the exhaust of the battery cell 20 cannot be discharged in a timely manner, causing heat diffusion between the battery cells 20 and further potentially causing an explosion of the battery 10.

[0068] Therefore, it is not preferable that the setting of this area S1 is too large or too small. For example, the range of the value of the area S1 of the projection 211' in the direction perpendicular to the first wall 21 of the pressure relief mechanism 211 is [50 mm 2 , 3000 mm 2 , and further for example, the range of the value of the area S1 can be set to [200 mm 2 , 1500 mm 2 , whereby the performance of this pressure relief mechanism 211 is more excellent. Specifically, this area S1 is generally 50 mm 2 , 100 mm 2 , 150 mm 2 ,​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​, 1500mm 2 , 1800mm 2 , 2000mm 2 , 2500mm 2 , 2800mm 2 or 3000mm 2 It can also be used as a setting.

[0069] It should be understood that the projected area S2 of the relief region 131 in the embodiment of this application in the direction perpendicular to the first wall 21 may be set according to the actual application, and the size of this area S2 is related to the number n of pressure relief mechanisms 211 corresponding to this relief region 131. Specifically, the area of ​​the relief region 131 can be adjusted by rationally setting the value of S2 / n. For example, if the value of S2 / n is set too large, the area of ​​the region corresponding to one pressure relief mechanism 211 in this relief region 131 will be too large, increasing the total area of ​​the relief region 131 on the attached structure 13, further affecting the strength of the attached structure 13, for example, affecting the support function of the attached structure 13 for the battery cell 20, and further affecting the structural strength and stability of the battery 10. Conversely, if the value of S2 / n is set too small, the area of ​​the region corresponding to one of the pressure relief mechanisms 211 in this relief region 131 will be too small, potentially shielding at least some of the pressure relief mechanisms 211. Furthermore, this will affect the normal operation of the pressure relief mechanism 211 and will not provide it with sufficient deformation space, thereby affecting the discharge of waste from the battery cells 20, making it easier to cause heat diffusion between the battery cells 20, and potentially causing the battery 10 to explode.

[0070] Therefore, it is undesirable for this area S2 to be too large or too small. For example, the projected area S2 in the direction perpendicular to the first wall 21 of the escape region 131 should be 50 mm². 2 ≤S2 / n ≤10000mm 2 Satisfying the conditions, and furthermore, for example, this area S2 is further 250 mm 2 ≤S2 / n ≤6000mm 2 This can be satisfied. Specifically, the value of S2 / n is generally 50 mm 2 , 100mm 2 , 150mm2 , 200mm 2 , 250mm 2 , 300mm 2 , 350mm 2 , 400mm 2 , 450mm 2 , 500mm 2 , 600mm 2 , 700mm 2 , 800mm 2 , 900mm 2 , 1000mm 2 , 1200mm 2 , 1500mm 2 , 1920mm 2 , 2000mm 2 , 2380mm 2 , 3000mm 2 , 4000mm 2 , 5000mm 2 , 5500mm 2 , 6000mm 2 , 7000mm 2 , 8000mm 2 , 9000mm 2 Or 10,000 mm 2 It can also be used as a setting.

[0071] The above describes the correspondence between the relief region 131 of the attached structure 13 of this application and the pressure relief mechanism 211, while linking the drawings. Below, the attached structure 13 of this application will be described in detail, while linking the drawings.

[0072] As shown in Figures 2 to 5, the housing 11 of the embodiment of this application includes an electrical cavity 11a which may be used to house battery cells 20, and may also be used to house other members, for example, a busbar member 30, i.e., the electrical cavity 11a provides mounting space for the battery cells 20 and the busbar member 30. The busbar member 30 is used to realize electrical connections between a plurality of battery cells 20, for example, parallel connections, series connections, or series-parallel connections. The busbar member 30 can realize electrical connections between battery cells 20 by connecting the electrode terminals 212 of the battery cells 20. In some embodiments, the busbar member 30 may be fixed to the electrode terminals 212 of the battery cells 20 by welding.

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

[0074] It should be understood that each electrode terminal 212 in the embodiments of this application may be installed on any one wall, and multiple electrode terminals 212 may be installed on the same wall or different walls of the battery cell 20. For example, as shown in Figures 2 to 6, each battery cell 20 may contain two electrode terminals 212, and these two electrode terminals 212 may be located on the same wall. Specifically, these two electrode terminals 212 may be located on a wall opposite the first wall 21, so that when the pressure release mechanism 211 of the first wall 21 is activated, it does not affect the two electrode terminals 212, or the effect on the two electrode terminals 212 is small, thus avoiding a short circuit between the battery cells 20. Alternatively, contrary to what is shown in Figures 2 to 6, the two electrode terminals 212 included in the battery cell 20 may be located on other walls, and the embodiments of this application are not limited thereto.

[0075] Furthermore, for example, taking the example that each battery cell 20 similarly includes two electrode terminals 212, these two electrode terminals 212 may be located on different walls, as shown in Figures 2 to 6. For example, the two electrode terminals 212 of the battery cell 20 may be located on two opposing walls of the battery cell 20. Alternatively, the two electrode terminals 212 of the battery cell 20 may be located on two intersecting walls, and the embodiments of this application are not limited thereto.

[0076] Selectively, as shown in Figures 2 to 6, the electrical cavity 11a may differ, and the housing 11 of the embodiments of this application may further include a collection cavity 11b for collecting and / or processing waste discharged through the pressure relief mechanism 211 when the pressure relief mechanism 211 is operating. For example, the collection cavity 11b can collect waste from the battery cell 20 when the pressure relief mechanism 211 is operating and further discharge the waste to the outside of the battery 10. The collection cavity 11b is used to collect waste and may be sealed or unsealed. In some embodiments, the collection cavity 11b may contain air or other gases. Selectively, the collection cavity 11b may contain a liquid, such as a cooling medium, or a component containing this liquid may be installed to further cool the waste entering the collection cavity 11b. Further selectively, the gas or liquid in the collection cavity 11b may circulate.

[0077] Selectively, as shown in Figures 2 to 6, the battery 10 of the embodiment of this application further includes an isolation member 114 for isolating the electrical cavity 11a and the collection cavity 11b. Herein, “isolation” means separation and does not necessarily have to be sealed. Specifically, the isolation member 114 is used to isolate the electrical cavity 11a and the collection cavity 11b, that is, the electrical cavity 11a for housing the battery cells 20 and the collection cavity 11b for collecting waste are separated from each other.

[0078] In the embodiments of this application, the isolation member 114 may include a wall shared by the electrical cavity 11a and the collection cavity 11b. As shown in Figures 2 to 6, the isolation member 114 (or a part thereof) may also be a wall shared by the electrical cavity 11a and the collection cavity 11b. In this way, the distance between the electrical cavity 11a and the collection cavity 11b can be reduced as much as possible, saving space and improving the space utilization rate of the housing 11.

[0079] Selectively, the isolation member 114 in the embodiments of this application may be a thermal management member for regulating the temperature of the battery cell 20. Specifically, the isolation member 114 may be used to contain a fluid for regulating the temperature of the battery cell 20. When cooling the battery cell 20, the isolation member 114 can contain a cooling medium to regulate the temperature of the battery cell 20, in which case the isolation member 114 may be called a cooling member, cooling system, or cooling plate. The isolation member 114 may also be used for heating, and the embodiments of this application are not limited to this. Selectively, the fluid in the isolation member 114 may circulate to achieve a better temperature control effect.

[0080] It should be understood that the housing 11 of the embodiments of this application can be realized in various ways, and the embodiments of this application are not limited thereto. For example, taking Figures 2 to 6 as examples, the housing 11 may include a first cover body 110 having an opening over the electrical cavity 11a, and a separator 114 covering the opening of this first cover body 110, and thus the wall for forming the electrical cavity 11a includes this first cover body 110 and this separator 114. Here, this first cover body 110 may be realized in various ways. For example, the first cover body 110 may be a hollow, one-piece structure with an open end, or the first cover body 110 may include a first portion 111 and a second portion 112 having openings on opposite sides, the first portion 111 covering one side opening of the second portion 112, thereby forming the first cover body 110 with an open end, and the isolation member 114 covering the other side opening of the second portion 112, thereby forming the electrical cavity 11a. With respect to the corresponding collection cavity 11b, the housing 11 may further include a protective member 115 for protecting the isolation member 114, the protective member 115 and the isolation member 114 forming the collection cavity 11b, i.e., the wall of the collection cavity 11b includes the protective member 115 and the isolation member 114.

[0081] Furthermore, unlike the configuration shown in Figures 2 to 6 above, the housing 11 may include a sealed second cover body, which may be used to form an electrical cavity 11a, or an isolation member 114 may be installed inside the cover body to isolate the electrical cavity 11a from the inside of the cover body, and further isolate the collection cavity 11b. Here, this second cover body can be realized in various ways, for example, it may include a third part and a fourth part, with the fourth part having an opening on one side to form a semi-closed structure, the isolation member 114 being installed inside the fourth part, and the third part covering the opening of the fourth part to further form a sealed second cover body.

[0082] For the sake of clarity, this application primarily describes the housing 11 shown in Figures 2 to 6 as an example, and the embodiments of this application are not limited thereto. Specifically, the battery 10 of the embodiments of this application may include a housing 11, which includes a first cover body 110, an isolation member 114, and a protective member 115, wherein the first cover body 110 and the isolation member 114 are used to form an electrical cavity 11a, and the isolation member 114 and the protective member 115 are used to form a collection cavity 11b. The first cover body 110 further includes a first portion 111 and a second portion 112 having openings on opposite sides, wherein the first portion 111 is used to cover one opening of the second portion 112, thereby forming a first cover body 110 with one end open, and the isolation member 114 is used to cover the other opening of the second portion 112, thereby forming an electrical cavity 11a.

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

[0084] In the embodiments of this application, as shown in Figures 2 to 6, the electrical cavity 11a includes a second wall 12, and the first wall 21 faces the second wall 12. Specifically, the pressure relief mechanism 211 of the battery cell 20 faces the second wall 12 of the electrical cavity 11a and not other battery cells 20, thereby making it easier to install a relief structure on the wall of the electrical cavity 11a and providing relief space for deformation of the pressure relief mechanism 211. This improves the space utilization rate of the battery 10 and reduces the risk of a battery cell 20 experiencing thermal runaway causing thermal runaway in other battery cells 20, thereby improving the safety of the battery 10.

[0085] For example, in Figures 2 to 6, the first wall 21 of the battery cell 20 where the pressure relief mechanism 211 is located faces the isolation member 114, meaning the isolation member 114 is used to form at least a portion of the second wall 12. Specifically, as shown in Figures 2 to 6, the pressure relief mechanism 211 is installed on the first wall 21 of the battery cell 20, which is the bottom wall of the battery cell 20, and the isolation member 114 is used as at least a portion of the second wall 12 of the electrical cavity 11a, with the first wall 21 facing the isolation member 114. In this way, the discharged material that has passed through the pressure relief mechanism 211 can be discharged from the electrical cavity 11a via the isolation member 114. For the sake of clarity, the embodiments of this application mainly use the example of the second wall 12 being the isolation member 114, but the embodiments of this application are not limited thereto.

[0086] For example, this second wall 12 may be any other wall of the electrical cavity 11a of the enclosure 11. For example, this second wall 12 may also be any one of the walls of the second portion 112.

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

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

[0089] For the sake of clarity, the embodiments of this application primarily use the isolation member 114 as the second wall 12, but the embodiments are not limited thereto. The relevant descriptions also apply to cases where the beam 113 is used as the second wall 12 or the wall of another electrical cavity 11a is used as the second wall 12. For brevity, no further explanation is provided here.

[0090] In the embodiments of this application, the attached structure 13 includes a second wall 12, which may have a relief area 131. This relief area 131 corresponds to a pressure release mechanism 211 of at least one battery cell 20, thereby allowing the discharged material that has passed through the pressure release mechanism 211 to be further discharged through the relief area 131 of the second wall 12. By rationally setting the size of the area of ​​the relief area 131 in the second wall 12, the discharged material can be discharged in a timely and rapid manner, preventing heat diffusion and explosion, and improving the safety of the battery 10. Furthermore, if the second wall 12 is an isolation member 114, the waste can be discharged to the collection cavity 11b via the isolation member 114. Also, if the isolation member 114 is a thermal management member, by rationally setting the area of ​​the escape region 131, for example, it is undesirable for the area of ​​the escape region 131 to be too large. An excessively large escape region 131 can avoid excessively reducing the space of the flow path for accommodating the fluid of the thermal management member, and further, it can avoid affecting the efficiency of temperature control of the thermal management member.

[0091] It should be understood that the relief region 131 in the embodiment of this application can be realized in various ways. For example, as shown in Figures 2 to 6, the relief region 131 includes a through hole 121 that penetrates the second wall 12, with the penetration direction being the thickness direction of the second wall 12, and the through hole 121 is used to discharge waste materials discharged from the pressure relief mechanism 211 through the through hole 121 to the electrical cavity 11a when the pressure relief mechanism 211 is operating. The relief region 131 includes a through hole 121 installed in the second wall 12, which is easy to machine on the one hand, and on the other hand, the through hole 121 provides deformation space for the pressure relief mechanism 211, and at the same time allows waste materials discharged through the pressure relief mechanism 211 to be rapidly discharged through the through hole 121.

[0092] Selectively, Figure 7 shows another schematic diagram of the battery 10 of the embodiment of this application, and as shown in Figure 7, the difference from the battery 10 shown in Figure 2 is that this battery 10 may further include a seal structure 122. Specifically, as shown in Figure 7, the seal structure 122 is installed in the second wall 12 and is used to seal the through hole 121 and is used to break when the pressure release mechanism 211 is activated to allow discharge to pass through the through hole 121. If this relief region 131 includes the through hole 121, the pressure release mechanism 211 is exposed, thereby making the pressure release mechanism 211 susceptible to external environmental influences during the use of the battery 10, and potentially causing the pressure release mechanism 211 to fail. Therefore, the installed seal structure 122 can, on the one hand, maintain the sealing performance of the electrical cavity 11a during the normal operation of the battery cell 20 and protect the pressure release mechanism 211 from being affected by the external environment, and on the other hand, if thermal runaway occurs in the battery cell 20, the seal structure 122 can be destroyed in a timely manner, exposing the through-hole 121, and the waste from the battery cell 20 can be discharged from the electrical cavity 11a through this through-hole 121, thereby avoiding thermal runaway and improving the safety of the battery 10.

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

[0094] Selectively, the relief region 131 of the embodiment of this application may be implemented in other ways. Figure 8 shows yet another schematic diagram of the battery 10 of the embodiment of this application, and as shown in Figure 8, this relief region 131 may be implemented in the form of a groove. Specifically, the relief region 131 includes a groove 123 in which the opening of the second wall 12 faces the pressure release mechanism 211, and the groove 123 is used to break when the pressure release mechanism 211 is activated, allowing the discharged material from the pressure release mechanism 211 to pass through the second wall 12 and be discharged from the electrical cavity 11a. Thus, the opening of the groove 123 faces the pressure release mechanism 211, and the interior of the groove 123 can provide the pressure release mechanism 211 with deformation space, thereby facilitating the operation of the pressure release mechanism 211 and the discharge of material.

[0095] It should be understood that if the attached structure 13 in which the escape region 131 is located includes a second wall 12, the second wall 12 and the first wall 21 may be in direct contact, or other structures may be installed between them. For example, a connecting structure may be installed between the second wall 12 and the first wall 21, used to connect and fix the second wall 12 and the first wall 21.

[0096] Figure 9 shows a schematic diagram of another exploded structure of the battery 10 of the embodiment of this application. Unlike Figure 3, as shown in Figure 9, the battery 10 further includes a connecting structure 14 installed between the first wall 21 and the second wall 12. The attached structure 13 includes the connecting structure 14. By installing the connecting structure 14 between the first wall 21 and the second wall 12, on the one hand, when thermal runaway is not occurring in the battery cell 20, this connecting structure 14 can provide relative fixation between the first wall 21 and the second wall 12 and sealing between the first wall 21 and the second wall 12, and on the other hand, the attached structure 13 may include this connecting structure 14, that is, this connecting structure 14 includes a relief region 131, which can avoid shielding of the connecting structure 14 from the pressure release mechanism 211, thereby allowing discharge of waste to proceed smoothly.

[0097] For example, as shown in Figure 9, a relief opening 141 corresponding to the pressure relief mechanism 211 is provided in the connection structure 14, and the relief region 131 includes the relief opening 141. The relief opening 141 can provide a deformation space when the pressure relief mechanism 211 is operating, thereby preventing the connection structure 14 from shielding the pressure relief mechanism 211 and causing the operation of the pressure relief mechanism 211 to be delayed, and allowing the discharged material that has passed through the pressure relief mechanism 211 to be quickly discharged through the relief opening 141.

[0098] It should be understood that the connection structure 14 in the embodiment of this application can be implemented in various ways. For example, the connection structure 14 is used to prevent waste discharged from the pressure relief mechanism 211 from entering the electrical cavity 11a when the pressure relief mechanism 211 is operating. This connection structure 14 may also serve as a sealing material, and in particular, when the pressure relief mechanism 211 is operating, the connection structure 14 is located between the first wall 21 and the second wall 12, and can prevent waste from entering the electrical cavity 11a through this connection structure 14. In this way, the discharged material that has passed through the pressure relief mechanism 211 can be directly discharged from the electrical cavity 11a through the relief opening 141 and the second wall 12 of the connection structure 14, respectively, and can be directly discharged to, for example, the collection cavity 11b. This prevents the battery cells 20 in the electrical cavity 11a from short-circuiting and causing heat diffusion and ultimately an explosion after the discharged material enters the electrical cavity 11a. Furthermore, the discharged material can be collected intensively, making it easier to process intensively, preventing the discharged material from affecting other components in the battery 10, and improving the safety of the battery 10.

[0099] Furthermore, for example, the connection structure 14 is used to discharge waste from the pressure relief mechanism 211 into the electrical cavity 11a when the pressure relief mechanism 211 is operating. In this way, the requirements for the sealing performance of the connection structure 14 can be reduced and made easier to implement. Moreover, by discharging some waste into the electrical cavity 11a via the connection structure 14, and simultaneously discharging some waste from the electrical cavity 11a via the connection structure 14 and the second wall 12, the discharge speed can be increased, reducing the risk of the battery 10 exploding. In addition, directional and dispersed discharge can be achieved, avoiding the impact of waste on other components and improving the safety and stability of the battery 10.

[0100] Discharging waste into the electrical cavity 11a via this connection structure 14 can be achieved in various ways. For example, Figure 10 shows a schematic local structure of a battery 10 according to an embodiment of this application, and the battery 10 shown in Figure 10 may be the same as the battery 10 shown in Figure 9, and the direction shown in Figure 10 is the opposite of the direction shown in Figure 9. As shown in Figure 10, the connection structure 14 is provided with a flow path 142 for discharging waste discharged from the pressure relief mechanism 211 into the electrical cavity 11a when the pressure relief mechanism 211 is operating. Waste discharged via the pressure relief mechanism 211 can be discharged into the electrical cavity 11a via the flow path 142, and by rationally setting the position of this flow path 142 in this way, directional discharge of waste can be achieved, reducing the impact of waste on individual components in the electrical cavity 11a and further improving the safety of the battery 10.

[0101] Specifically, as shown in Figure 10, the flow path 142 of the embodiment of this application includes through holes and / or grooves that penetrate the connecting structure 14, making it easy to manufacture and allowing discharged material to pass through quickly.

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

[0103] It should be understood that a filler may be placed in the flow path 142, and by rationally setting the melting point of this filler, it is used to seal the flow path 142 when the pressure relief mechanism 211 is not operating, and when the pressure relief mechanism 211 is operating, it is destroyed, for example, melted, thereby allowing the flow in the flow path 142 to conduct, thereby improving the sealing performance of the electrical cavity 11a when thermal runaway is not occurring in the battery cell 20, and preventing the battery cell 20 from being affected or destroyed. Here, the material of the filler may be selected according to the actual application, for example, the material of the filler may include foam adhesive and / or plastic, but the embodiments of this application are not limited thereto.

[0104] In the embodiments of this application, the flow path 142 is an example in which a groove is installed in the connecting structure 14. As shown in Figure 10, the connecting structure 14 may include a plurality of flow paths 142, and these plurality of flow paths 142 may include grooves installed on the surface of the connecting structure 14 facing the first wall 21, i.e., grooves whose opening faces the surface of the first wall 21, and / or grooves installed on the surface of the connecting structure 14 facing the second wall 12, i.e., grooves whose opening faces the second wall 12. For example, in Figure 10, the flow path 142 is an example in which a groove is installed on the surface of the connecting structure 14 facing the second wall 12, i.e., the opening of the groove faces the second wall 12.

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

[0106] It should be understood that the extension direction of the flow path 142 in the embodiment of this application may be set according to the actual application. For example, the extension direction of the flow path 142 can be rationally set according to the positional relationship between the electrode terminals 212 of the battery cell 20 and the pressure release mechanism 211, thereby avoiding the influence of discharge on the electrode terminals 212 and the busbar member 30 connected to the electrode terminals 212.

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

[0108] Furthermore, as shown in Figure 10, if the electrode terminal 212 is located on another wall, for example, on a wall intersecting the first wall 21, or on the first wall 21, the direction of the flow path 142 can be rationally set to avoid the impact of discharge on the electrode terminal 212, for example, by avoiding short circuits between different busbar members 30 connecting the electrode terminal 212 due to metal debris in the discharge, and further improving the safety of the battery 10.

[0109] Selectively, the connection structure 14 may be installed in other ways. For example, the connection structure 14 may be used to break apart when the pressure relief mechanism 211 is activated, forming a gap between the first wall 21 and the second wall 12, and this gap may be used to discharge waste from the pressure relief mechanism 211 into the electrical cavity 11a. By rationally selecting the material of the connection structure 14, an appropriate melting point for the connection structure 14 can be obtained, so that the connection structure 14 breaks apart when the pressure relief mechanism 211 is activated, further forming a gap, thereby discharging waste into the electrical cavity 11a, thus eliminating the need to install additional structures on the connection structure 14, which is simpler and can also ensure the sealing performance of the battery cell 20 during normal use.

[0110] Specifically, in the embodiments of this application, the failure of the connection structure 14 may include the failure of at least a portion of the connection structure 14. For example, when the pressure relief mechanism 211 is activated, the connection structure 14 may be destroyed only externally, with some internal members of the exposed connection structure 14 remaining intact, or the internal structure of the connection structure 14 may be destroyed, for example, the connection structure 14 may be a multilayer structure, with some structural layers in the multilayer structure being destroyed, or the connection structure 14 may be destroyed entirely, and the embodiments of this application are not limited thereto.

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

[0112] Selectively, the connection structure 14 may include a heat conduction pad installed between the first wall 21 and the second wall 12, which can dissipate heat from the battery cell 20 during the operation of the battery 10. For example, if the second wall 12 is a thermal management member, the heat conduction pad can transfer the heat from the battery cell 20 to the thermal management member, thereby timely adjustment of the temperature of the battery cell 20 and ensuring the normal operation of the battery cell 20. For example, as shown in Figure 10, the connection structure 14 may include a heat conduction pad, which may be a portion where a plurality of second flow channels 142b in the Y direction extending along the second direction Y in the figure are installed.

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

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

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

[0116] It should be understood that the materials for the thermal conductive pad, gasket, and adhesive in the embodiments of this application may all be selected according to the actual application. For example, the material for the thermal conductive pad may include thermally conductive silica gel. Furthermore, for example, the material for the gasket may include at least one of silicone rubber, polypropylene (PP), soluble polytetrafluoroethylene (PFA), and polyimide (PI). For example, the material for the adhesive may include at least one of epoxy structural adhesives, acrylate structural adhesives, polyimide structural adhesives, maleimide structural adhesives, polyurethane structural adhesives, and acrylic adhesives. Furthermore, for example, the material for the adhesive layer may include a polymer adhesive and a thermal conductive material, the material for the polymer adhesive may include at least one of epoxy resin, organic silica gel, and polyimide, and the thermal conductive material may include at least one of Al2O3, ZnO, BeO, AlN, Si3N4, BN, SiC, B4C, carbon nanotubes, and graphite nanosheets, and the embodiments of this application are not limited thereto.

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

[0118] Specifically, if the setting of S2 / (n*S1) is too small, for example, less than 0.3, there is a possibility that the area of ​​the pressure release mechanism 211 is relatively large, but the area of ​​the relief region 131 corresponding to this pressure release mechanism 211 is relatively small. In this way, on the one hand, the relief region 131 may not be able to provide sufficient deformation space for the pressure release mechanism 211, and as a result, at least a part of the pressure release mechanism 211 may be shielded by the relief region 131, preventing it from operating normally, and furthermore, the discharged material inside the battery cell 20 will not be discharged in a timely manner. On the other hand, if the pressure release mechanism 211 can operate normally, because the area of ​​the relief region 131 is relatively small, the discharged material may pass through this relief region 131 quickly and not be discharged, that is, a discharge bottleneck exists in this relief region 131, and similarly, the discharged material inside the battery cell 20 will not be discharged in a timely manner. Therefore, in both of these situations, thermal diffusion may occur after the battery cell 20 experiences thermal runaway, further causing the battery 10 to explode and affecting the safety of the battery 10.

[0119] Conversely, if the setting of S2 / (n*S1) is too large, for example, greater than 8.5, there is a possibility that the area of ​​the pressure release mechanism 211 is too small, or that the area of ​​the relief region 131 corresponding to the pressure release mechanism 211 is too large. If the area of ​​the pressure release mechanism 211 is too small, the waste products inside the battery cell 20 will not be discharged from the battery cell 20 in a timely and rapid manner, and furthermore, after the battery cell 20 experiences thermal runaway, it will cause thermal diffusion, which may lead to the explosion of the battery 10 and affect the safety of the battery 10. If the area of ​​the relief region 131 is too large, it will reduce the rigidity and strength of the attached structure 13 where this relief region 131 is located, affecting the performance of the attached structure 13, and for example, it may affect the support function of the attached structure 13 for the battery cell 20.

[0120] While this application has been described with reference to preferred embodiments, various improvements and replacements of equivalent components can be made therewith without departing from the scope of this application. In particular, unless there is a structural conflict, each technical feature referred to in each embodiment may be combined in any manner. This application is not limited to the specific embodiments disclosed in the specification, but includes all technical ideas that fall within the scope of the claims.

Claims

1. It is a battery, A housing (11) including an electrical cavity (11a), A battery cell (20) housed in the electrical cavity (11a), wherein a pressure release mechanism (211) is installed on the first wall (21) of the battery cell (20), The attached structure (13) is attached to the first wall (21), and the attached structure (13) is provided with at least one relief region (131), the relief region (131) is used to provide deformation space for the pressure release mechanism (211) of at least one of the battery cells (20), and the relief region (131) satisfies 0.3 ≤ S2 / (n * S1) ≤ 8.

5. Here, S1 is the projected area of ​​the pressure relief mechanism (211) in a direction perpendicular to the first wall (21), S2 is the projected area of ​​the relief region (131) in a direction perpendicular to the first wall (21), n ​​is the number of pressure relief mechanisms (211) corresponding to the relief region (131), and n is a positive integer. At least one of the relief regions (131) corresponds to a plurality of the pressure relief mechanisms (211), The electrical cavity (11a) includes a second wall (12), and the first wall (21) faces the second wall (12). The attached structure (13) includes the second wall (12), The battery is characterized in that the relief region (131) includes a through hole (121) that penetrates the second wall (12), the direction of penetration is the thickness direction of the second wall (12), and the through hole (121) is used to discharge waste materials discharged from the pressure relief mechanism (211) through the through hole (121) to the electrical cavity (11a) when the pressure relief mechanism (211) is in operation.

2. The battery according to claim 1, characterized in that the escape region (131) satisfies 0.8 ≤ S2 / (n * S1) ≤ 4.

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

4. The projected area S2 of the escape region (131) in the direction perpendicular to the first wall (21) is 50 mm 2 ≤S² / n ≤10000mm 2 A battery according to claim 1 or 2, characterized in that it satisfies the following conditions.

5. The battery according to claim 1, characterized in that a sealing structure (122) is installed on the second wall (12), the sealing structure (122) is used to seal the through hole (121), and the sealing structure (122) is destroyed when the pressure release mechanism (211) is activated to allow the discharged material to pass through the through hole (121).

6. The sealing structure (122) is installed on the surface of the second wall (12) facing the first wall (21), and / or The battery according to claim 5, characterized in that the sealing structure (122) is installed on the surface of the second wall (12) which is separated from the first wall (21).

7. The battery according to claim 1, wherein the relief region (131) includes a groove (123) in which the opening of the second wall (12) faces the pressure release mechanism (211), and the groove (123) is destroyed when the pressure release mechanism (211) is in operation and is used to allow waste discharged from the pressure release mechanism (211) to pass through the second wall (12) and be discharged from the electrical cavity (11a).

8. The aforementioned battery is The battery according to claim 1, further comprising a connecting structure (14) installed between the first wall (21) and the second wall (12), wherein the attached structure (13) includes the connecting structure (14).

9. The battery according to claim 8, wherein the connection structure (14) is provided with a relief opening (141) corresponding to the pressure release mechanism (211), and the relief region (131) includes the relief opening (141).

10. The battery according to claim 8, characterized in that the connection structure (14) is used to prevent waste discharged from the pressure relief mechanism (211) from entering the electrical cavity (11a) when the pressure relief mechanism (211) is operating.

11. The battery according to claim 8, characterized in that the connection structure (14) is used to discharge waste materials discharged from the pressure relief mechanism (211) into the electrical cavity (11a) when the pressure relief mechanism (211) is operating.

12. The battery according to claim 11, wherein the connection structure (14) is provided with a flow path (142) for discharging waste discharged from the pressure relief mechanism (211) into the electrical cavity (11a) when the pressure relief mechanism (211) is in operation.

13. The battery according to claim 11, characterized in that the connection structure (14) is destroyed when the pressure relief mechanism (211) is in operation to form a gap between the first wall (21) and the second wall (12), and the gap is used to discharge waste materials discharged from the pressure relief mechanism (211) into the electrical cavity (11a).

14. The aforementioned battery is The battery according to claim 1, further comprising a collection cavity (11b) for collecting waste from the battery cell (20) when the pressure release mechanism (211) is in operation.

15. The aforementioned battery is The battery according to claim 14, further comprising an isolation member (114) for separating the electrical cavity (11a) and the collection cavity (11b).

16. The battery according to claim 15, characterized in that the isolation member (114) is formed as at least a part of the second wall (12).

17. It is a power-consuming device, A power-consuming device comprising a battery according to claim 1 or 2, wherein the battery is used to provide electrical energy to the power-consuming device.

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