Battery housing, battery, power consumption device, battery manufacturing method and apparatus

Abstract

The embodiments of the present application provide a battery housing, a battery, a power consumption device, and a manufacturing method and apparatus for a battery. The battery housing includes an electrical cavity, a thermal management member, and a collection cavity for collecting exhaust from the battery cell provided with the pressure relief mechanism when the pressure relief mechanism is activated, where the thermal management member is used to isolate the electrical cavity from the collection cavity, and a pressure relief area is provided on the thermal management member, and the exhaust collected by the collection cavity is discharged through the pressure relief area. The technical solutions of the embodiments of the present application can improve the safety of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and particularly to a battery housing, a battery, a power consumption device, a battery manufacturing method, and a battery manufacturing apparatus.

Background Art

[0002] Energy conservation and reduction of pollutant emissions are the keys to the sustainable development of the automotive industry. In such a case, electric vehicles have become an important component of the sustainable development of the automotive industry due to their energy conservation and environmental protection advantages. Also, for electric vehicles, battery technology is an important factor related to their development.

[0003] In the development of battery technology, in addition to improving the performance of batteries, safety issues are also one of the problems that cannot be ignored. If the safety issues of a battery cannot be guaranteed, this battery cannot be used. Therefore, how to reinforce the safety of batteries is one of the technical problems that urgently need to be solved in battery technology.

Summary of the Invention

Problems to be Solved by the Invention

[0004] This application provides a battery housing, a battery, a power consumption device, a battery manufacturing method, and a battery manufacturing apparatus that can improve the safety of batteries.

Means for Solving the Problems

[0005] According to a first aspect, a battery housing is provided. The battery housing is an electrical cavity for accommodating a plurality of battery cells, and at least one of the plurality of battery cells includes a pressure relief mechanism. The pressure relief mechanism is used to operate to release the internal pressure when the internal pressure or temperature of the battery cell in which the pressure relief mechanism is provided reaches a threshold value. The battery housing includes: the electrical cavity; a thermal management member for accommodating a fluid to adjust the temperature of the plurality of battery cells; and a collection cavity for collecting discharges from the battery cell in which the pressure relief mechanism is provided when the pressure relief mechanism operates. Here, the thermal management member is used to isolate the electrical cavity from the collection cavity. A pressure relief area is provided on the thermal management member, and the discharges collected by the collection cavity are discharged through the pressure relief area.

[0006] The battery housing of the embodiment of the present application separates the electrical cavity for accommodating battery cells from the collection cavity for collecting discharges by using a thermal management member. When the pressure relief mechanism operates, the discharges of the battery cell enter the collection cavity and do not enter or slightly enter the electrical cavity, so that there is no short circuit between the electrical connection members in the electrical cavity, thereby improving the safety of the battery. At the same time, after the discharges generated after the battery cell runs away are discharged into the collection cavity, they are discharged to the outside of the collection cavity through the pressure relief area, thereby extending the discharge path of the discharges, effectively reducing the temperature of the discharges, reducing the influence of the discharges on the external environment of the battery, and further improving the safety of the battery.

[0007] In some embodiments, the pressure relief area is installed offset from the pressure relief mechanism.

[0008] The pressure release area in the embodiments of the present application is an area installed on the heat management member and not corresponding to the pressure release mechanism. That is, the position of the pressure release area is offset from the position of the pressure release mechanism. By shifting the positions of the two, the emissions in the collection cavity can pass through the pressure release area and be smoothly discharged to the outside of the collection cavity, thereby achieving the effect of extending the exhaust path, effectively reducing the temperature of the emissions, reducing the impact of the emissions on the external environment of the battery, and further improving the safety of the battery.

[0009] In some embodiments, the pressure release area is a pressure release hole, and the emissions collected by the collection cavity are discharged through the pressure release hole. Or the pressure release area is a fragile area, and the emissions collected by the collection cavity are discharged after breaking through the fragile area.

[0010] Optionally, the pressure release area in the embodiments of the present application may be a pressure release hole. At this time, the emissions in the collection cavity can pass through the pressure release hole and be directly discharged. Or the pressure release area in the embodiments of the present application may be a fragile area, and when the pressure or temperature in the collection cavity reaches a certain threshold value, it can break through the fragile area and be discharged.

[0011] In some embodiments, the electrical cavity includes a first pressure balance mechanism for balancing the pressure inside and outside the housing, and the emissions pass through the pressure release area and then are discharged to the outside of the housing through the first pressure balance mechanism.

[0012] The emissions in the collection cavity according to the embodiments of the present application can pass through the pressure release area and then be further discharged to the outside of the housing through the first pressure balance mechanism. By installing the first pressure balance mechanism, the emissions can be timely discharged from the electrical cavity, and the impact of the emissions on other battery cells can be reduced.

[0013] Optionally, the first pressure balance mechanism in the embodiments of the present application may be one or more, and the number thereof can be set according to the actual situation, and the embodiments of the present application do not limit this.

[0014] In some embodiments, the electric cavity includes a first sub-cavity and a second sub-cavity. The second sub-cavity is installed adjacent to the first sub-cavity. The first sub-cavity is used to accommodate the plurality of battery cells. The first pressure balance mechanism is installed on the outer wall of the second sub-cavity. The exhaust gas collected by the collection cavity enters the second sub-cavity through the pressure release area and is discharged to the outside of the housing through the first pressure balance mechanism.

[0015] After the exhaust gas in the collection cavity passes through the pressure release area, it can enter a second sub-cavity isolated from the first sub-cavity for accommodating battery cells. By providing the second sub-cavity as an exhaust buffer area for the exhaust gas, the exhaust gas can be isolated from the plurality of battery cells, and the influence of the exhaust gas on the battery cells in the first sub-cavity can be reduced.

[0016] In some embodiments, the pressure release area is installed in the area corresponding to the second sub-cavity of the heat management member.

[0017] By installing the pressure release area corresponding to the second sub-cavity, the exhaust gas in the collection cavity can enter the second sub-cavity after passing through the pressure release area, thereby further buffering the exhaust gas, achieving the effect of extending the exhaust path, effectively reducing the temperature of the exhaust gas, reducing the influence of the exhaust gas on the external environment of the battery, and further improving the safety of the battery.

[0018] In some embodiments, a second pressure balance mechanism is installed on the common wall between the first sub-cavity and the second sub-cavity, and the second pressure balance mechanism is used to balance the pressure between the first sub-cavity and the second sub-cavity.

[0019] In the embodiments of the present application, when the internal pressure of the first sub-cavity is greater than the pressure of the external environment, if the internal pressure cannot be timely discharged outside the housing, it may cause damage to the mechanical components of the battery. In the embodiments of the present application, by installing the second pressure balance mechanism, the pressure of the first sub-cavity passes through the second pressure balance mechanism and is discharged into the second sub-cavity, and can be discharged through the first pressure balance mechanism installed on the outer wall of the second sub-cavity, thereby maintaining the internal temperature or pressure in the first sub-cavity in a normal state, thereby ensuring the safety of the battery. At the same time, by allowing the internal temperature or pressure of the first sub-cavity to escape into the second sub-cavity, a buffer area can be provided for the discharge of the discharged matter, thereby further reducing the temperature of the discharged matter and reducing the impact of the discharged matter on the external environment of the battery, thereby further improving the safety of the battery.

[0020] In some embodiments, the second pressure balance mechanism is opened and closed in one direction, and the second pressure balance mechanism is used to release the internal pressure into the second sub-cavity when the pressure or temperature in the first sub-cavity reaches a certain threshold.

[0021] The second pressure balance mechanism in the embodiments of the present application is opened and closed in one direction, which can release the pressure in the first sub-cavity into the second sub-cavity, thereby ensuring the balance of the pressure between the first sub-cavity and the second sub-cavity, and at the same time, the discharged matter can only escape from the first sub-cavity into the second sub-cavity, preventing the discharged matter in the second sub-cavity from entering the first sub-cavity and affecting the safety of the battery cell.

[0022] In some embodiments, the first sub-cavity and the second sub-cavity communicate with each other only through the second pressure balance mechanism.

[0023] By arranging the first sub-cavity and the second sub-cavity to communicate with each other only through the second pressure balance mechanism, when thermal runaway occurs, the gas in the second sub-cavity will not enter the first sub-cavity through other paths, preventing the influence of high-temperature exhaust on the battery cells in the first sub-cavity where thermal runaway has not occurred.

[0024] In some embodiments, a third pressure balance mechanism is installed on the walls of the first sub-cavity other than the common wall with the second sub-cavity. The third pressure balance mechanism is used to release the internal pressure to the outside of the housing when the pressure or temperature in the first sub-cavity reaches a certain threshold value.

[0025] The third pressure balance mechanism in the embodiments of the present application can timely discharge the pressure in the first sub-cavity and maintain the internal and external air pressures of the first sub-cavity and the second sub-cavity in a normal state, thereby ensuring the safety of the battery.

[0026] In some embodiments, a hollow cross beam is installed in the electrical cavity. The second wall of the second sub-cavity is formed by at least a part of the hollow cross beam. A fourth pressure balance mechanism is installed on the second wall. The exhaust collected by the collection cavity enters the hollow cross beam through the pressure release area, then enters the second sub-cavity through the fourth pressure balance mechanism, and is finally discharged to the outside of the housing through the first pressure balance mechanism.

[0027] By installing a hollow cross beam and a fourth pressure balance mechanism on the second wall of the hollow cross beam, after the emissions in the collection cavity enter the hollow cross beam through the pressure release area, they pass through the fourth pressure balance mechanism and enter the second sub-cavity. After the pressure and temperature in the second sub-cavity reach a certain threshold value, they are discharged to the outside of the housing, thereby ensuring the pressure balance inside and outside the battery and improving the safety of the battery.

[0028] In some embodiments, a hollow cross beam for connection to the outer wall of the electrical cavity is installed in the electrical cavity, and a fifth pressure balance mechanism is installed on the outer wall of the electrical cavity. The emissions collected by the collection cavity enter the hollow cross beam through the pressure release area and are discharged to the outside of the housing through the fifth pressure balance mechanism.

[0029] In the embodiments of the present application, the emissions in the collection cavity can enter the hollow cross beam after passing through the pressure release area and be discharged through the fifth pressure balance mechanism on the outer wall of the electrical cavity connected to the hollow cross beam. By installing the hollow cross beam, the discharge path of the emissions in the collection cavity can be extended, providing sufficient time to effectively reduce the temperature of the emissions, reducing the impact of the emissions on the external environment of the battery, and thereby further improving the safety of the battery.

[0030] In some embodiments, the pressure release area is installed in the area corresponding to the hollow cross beam of the thermal management member.

[0031] By installing the pressure release area corresponding to the hollow cross beam, the exhaust in the collection cavity can pass through the pressure release area and enter the hollow cross beam, thereby further buffering the exhaust, achieving the effect of extending the exhaust path, effectively reducing the temperature of the exhaust, reducing the impact of the exhaust on the external environment of the battery, and thereby further improving the safety of the battery. Furthermore, there is no need to install an extra gas buffer space, and the space inside the hollow cross beam can be directly utilized, thereby improving the energy density of the battery.

[0032] In some embodiments, a temperature reduction material is installed in the hollow cross beam.

[0033] By installing a temperature reduction material in the hollow cross beam, on the one hand, the temperature of the exhaust can be reduced, and on the other hand, it can also play a role in protecting the side wall of the hollow cross beam.

[0034] In some embodiments, a temperature reduction material is installed on the surface of the heat management member that is separated from the plurality of battery cells.

[0035] By installing a temperature reduction material on the wall (i.e., the bottom wall) that is separated from the surface of the battery cell of the heat management member, the temperature of the exhaust discharged through the pressure release mechanism can be reduced, thereby reducing the impact of the exhaust on the external environment and improving the safety performance of the battery.

[0036] Optionally, the temperature reduction material installed on the bottom wall of the heat management member in the embodiments of the present application may be installed avoiding the pressure release mechanism and the above-mentioned pressure release area.

[0037] In some embodiments, the housing further includes a protective component for being located on the side of the heat management member that is separated from the battery cells, and the protective component and the heat management member form the collection cavity. Here, a temperature reduction material is installed on the protective component.

[0038] The collection cavity formed by the protective component and the heat management member can effectively collect and buffer the exhaust, and reduce its risk. At the same time, the protective component can protect the heat management member and prevent the heat management member from being damaged by foreign objects. Furthermore, by installing a temperature reduction material on the protective component, on the one hand, the temperature of the exhaust discharged from the pressure relief mechanism can be reduced, and on the other hand, the impact of the high-temperature exhaust on the bottom of the protective component can be reduced, and the protective component can be protected.

[0039] In some embodiments, the protective component and the heat management member are hermetically connected.

[0040] The protective component in the embodiment of the present application may be hermetically connected to the heat management member such that the exhaust in the collection cavity passes through the pressure relief area and then is discharged from the battery housing. Compared with the method in which the exhaust is directly discharged through the bottom wall of the protective component, the embodiment of the present application extends the exhaust discharge path, further reduces the temperature of the exhaust, reduces the impact of the exhaust on the external environment of the battery, and thereby can further improve the safety of the battery.

[0041] In some embodiments, the temperature reduction material installed on the protective component is installed in the area corresponding to the pressure relief mechanism of the protective component.

[0042] By installing the temperature reduction material on the protective component corresponding to the pressure relief mechanism, the temperature reduction effect of the exhaust can be improved, and a better protection effect on the bottom of the protective component can be achieved.

[0043] In some embodiments, the temperature reduction material is a phase change material.

[0044] Optionally, the temperature reduction material in the embodiment of the present application may be a phase change material. The phase change material can melt when contacting the high-temperature exhaust and reduce the temperature of the exhaust. As long as the temperature reduction effect can be achieved, the temperature reduction material in the embodiment of the present application may be other materials, and the embodiment of the present application does not limit this.

[0045] Optionally, for the phase change material in the embodiments of the present application, a coating method may be used to coat the phase change material on the surface of the exhaust path including the hollow cross beam, the heat management member and the protective component. Here, in the embodiments of the present application, a high temperature resistant material, such as mica paper, may be attached to the surface of the exhaust path to protect the surface of the exhaust path.

[0046] In some embodiments, the heat management member is configured such that when the pressure relief mechanism is activated, the exhaust can pass through the heat management member and enter the collection cavity.

[0047] Optionally, the heat management member in the embodiments of the present application may be broken so that the exhaust can pass through the heat management member and enter the collection cavity, or the heat management member may directly communicate with the collection cavity so that the exhaust can enter the collection cavity without breaking the heat management member.

[0048] In some embodiments, the heat management member has a common wall between the electrical cavity and the collection cavity.

[0049] As the common wall between the electrical cavity and the collection cavity, the heat management member can isolate the exhaust from the electrical cavity, thereby reducing the risk of the exhaust and improving the safety of the battery.

[0050] In some embodiments, the heat management member is configured to be broken so that the fluid flows out when the pressure relief mechanism is activated.

[0051] By configuring the heat management member to be broken so that the fluid can flow out, the temperature of the battery cell and the exhaust can be reduced using the fluid, thereby further improving the safety of the battery.

[0052] In some embodiments, the thermal management member includes a first heat conduction plate attached to the plurality of battery cells, a second heat conduction plate disposed on a side of the first heat conduction plate away from the battery cells, and a flow path formed between the first heat conduction plate and the second heat conduction plate through which the fluid flows here.

[0053] The thermal management member in the embodiments of the present application includes a first heat conduction plate and a second heat conduction plate. The first heat conduction plate and the second heat conduction plate can form a flow path for accommodating a fluid in the thermal management member, thereby realizing a temperature drop or heating of the battery cells.

[0054] In some embodiments, the flow path is not installed in the pressure relief area of the thermal management member.

[0055] By not installing a flow path at the position where the pressure relief area is located, it becomes easier for the discharge in the collection cavity to pass through the pressure relief area and be discharged.

[0056] According to a second aspect, a battery is provided, which includes a plurality of battery cells. At least one of the plurality of battery cells includes a pressure relief mechanism. The pressure relief mechanism is used to operate to release the internal pressure when the internal pressure or temperature of the battery cell in which the pressure relief mechanism is provided reaches a threshold value. The battery also includes the housing described in the first aspect.

[0057] According to a third aspect, a power consumption device is provided, which includes the battery described in the second aspect.

[0058] In some embodiments, the power consumption device is a vehicle, a ship, or an aircraft.

[0059] According to a fourth aspect, a method for manufacturing a battery is provided. The manufacturing method includes providing a plurality of battery cells, wherein at least one of the plurality of battery cells includes a pressure relief mechanism. The pressure relief mechanism is used to operate so as to release the internal pressure when the internal pressure or temperature of the battery cell in which the pressure relief mechanism is provided reaches a threshold value. The method also includes providing a housing, which includes an electrical cavity for accommodating the plurality of battery cells, a thermal management member for accommodating a fluid to adjust the temperature of the plurality of battery cells, and a collection cavity for collecting emissions from the battery cell in which the pressure relief mechanism is provided when the pressure relief mechanism operates. Here, the thermal management member is used to isolate the electrical cavity and the collection cavity, a pressure relief area is installed on the thermal management member, and the emissions collected by the collection cavity further pass through the pressure relief area and are discharged. The method further includes accommodating the plurality of battery cells in the electrical cavity.

[0060] According to a fifth aspect, a manufacturing apparatus for a battery is provided. The manufacturing apparatus includes a first providing module for providing a plurality of battery cells, wherein at least one of the plurality of battery cells includes a pressure relief mechanism. The pressure relief mechanism is used to operate so as to release the internal pressure when the internal pressure or temperature of the battery cell in which the pressure relief mechanism is provided reaches a threshold value. The manufacturing apparatus also includes a second providing module for providing a housing, which includes an electrical cavity for accommodating the plurality of battery cells, a thermal management member for accommodating a fluid to adjust the temperature of the plurality of battery cells, and a collection cavity for collecting emissions from the battery cell in which the pressure relief mechanism is provided when the pressure relief mechanism operates. Here, the thermal management member is used to isolate the electrical cavity and the collection cavity, a pressure relief area is installed on the thermal management member, and the emissions collected by the collection cavity further pass through the pressure relief area and are discharged. The manufacturing apparatus further includes an attachment module for accommodating the plurality of battery cells in the electrical cavity.

Brief Description of the Drawings

[0061] To more clearly illustrate the technical solutions of the embodiments of this application, the following briefly introduces the drawings that need to be used in the embodiments of this application. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, based on these drawings, other drawings can be obtained without creative efforts.

[0062]

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[0063] In the drawings, the drawings are not drawn to actual scale.

Modes for Carrying Out the Invention

[0064] Hereinafter, the embodiments of the present application will be described in more detail while associating the drawings with the examples. Hereinafter, the detailed description of the examples and the drawings are for exemplarily explaining the principle of the present application, but not for limiting the scope of the present application. That is, the present application is not limited to the described embodiments.

[0065] In the description of the present application, it should be noted that, unless otherwise specified, "a plurality of" means two or more (including two). The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is only for the convenience of description and simplification of the description of the present application, and does not indicate or imply that the mentioned device or element must have a specific orientation and be configured and operated in a specific orientation. Therefore, it should not be understood as a limitation to the present application. It should be noted that terms such as "first", "second", "third", etc. are only used for the purpose of description and should not be understood as indicating or implying relative importance. "Vertical" is not strictly vertical but within the allowable error range. "Parallel" is not strictly parallel but within the allowable error range.

[0066] The orientation terms appearing in the following description are all in the directions shown in the figures and do not limit the specific structure of the present application. In the description of the present application, it should be further noted that, unless specifically defined and limited, terms such as "attachment", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral connection. It may be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific situation.

[0067] In this application, the battery cell may include a primary battery, a secondary battery, and may be, for example, a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and the embodiments of this application do not limit this. The battery cell may exhibit a cylindrical body, a flat body, a cuboid, or other shapes, etc., and the embodiments of this application do not limit this either. The battery cell is generally divided into three types, namely, a cylindrical battery cell, a square battery cell, and a pouch battery cell, in a packaging manner, and the embodiments of this application do not limit this either.

[0068] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide a higher voltage and capacity. For example, the battery referred to in this application may be a battery pack, etc. The battery pack generally includes a housing for packaging one or more battery cells. The housing can avoid the influence of liquid or other foreign substances on the charging or discharging of the battery cell.

[0069] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes 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 electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector without the positive electrode active material layer protrudes from the current collector already coated with the positive electrode active material layer, and the current collector without the positive electrode active material layer is used as the 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 cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, 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. The current collector without the negative electrode active material layer protrudes from the current collector already coated with the negative electrode active material layer, and the current collector without the negative electrode active material layer is used as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. To ensure that it does not fuse even when a large current flows, the number of positive electrode tabs is plural and they are laminated, and the number of negative electrode tabs is plural and they are laminated. The material of the separator may be polypropylene (PP) or polyethylene (PE), etc. Note that the electrode assembly may have a wound structure or a laminated structure, and the embodiments of the present application are not limited thereto. The development of battery technology needs to consider multiple design factors simultaneously, such as performance parameters like energy density, cycle life, discharge capacity, charge and discharge rate, etc., and also needs to consider the safety of the battery.

[0070] For a battery, the main safety hazards stem from the charging and discharging processes. To improve the safety performance of the battery, a pressure relief mechanism is generally installed in the battery cell. The pressure relief mechanism is an element or component that operates to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold value. This predetermined threshold value can be adjusted according to different design requirements. The predetermined threshold value may depend on one or more of the materials of the positive electrode plate, negative electrode plate, electrolyte, and separator in the battery cell. The pressure relief mechanism may employ a pressure-sensitive or temperature-sensitive element or component, that is, when the internal pressure or temperature of the battery cell reaches the predetermined threshold value, the pressure relief mechanism operates to form a channel through which the internal pressure or temperature can be released.

[0071] As used in this application, "operation" means that the internal pressure and temperature of the battery cell are released due to the occurrence of an operation in the pressure relief mechanism. The operations occurring in the pressure relief mechanism may include, but are not limited to, the destruction, tearing, or melting of at least a part of the pressure relief mechanism. After the pressure relief mechanism operates, the high-temperature and high-pressure substances inside the battery cell are discharged from the pressure relief mechanism to the outside as emissions. In this way, when the pressure or temperature is controllable, the pressure of the battery cell can be released, thereby avoiding the occurrence of potentially more serious accidents.

[0072] The emissions from the battery cell mentioned in this application include, but are not limited to, the electrolyte, fragments of the dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, and flames.

[0073] The pressure relief mechanism on the battery cell has an important impact on the safety of the battery. For example, when phenomena such as short circuit or overcharging occur in the battery cell, thermal runaway may occur inside the battery cell, causing the pressure or temperature to rise rapidly. In such a case, the operation of the pressure relief mechanism can release the internal pressure and temperature to the outside, preventing the explosion and ignition of the battery cell.

[0074] In the current design proposal of the pressure relief mechanism, attention is mainly paid to releasing the high pressure and high heat inside the battery cell, that is, discharging the above-mentioned discharge products to the outside of the battery cell. However, the flame, smoke, gas, etc. generated after the battery cell runs away can instantaneously reach a temperature of over 1000°C. If the current discharge method is adopted, the discharge products will directly impact the bottom of the battery housing, easily ablate the corrosion-resistant coating at the bottom of the housing, form a high-temperature hot spot, very easily ignite the mixture of combustible gas and air, cause a fire, and it is easy to deposit high-temperature particles on the exhaust path, increase the temperature of other battery cells, and further cause a thermal runaway event, so there is a safety risk.

[0075] In view of this, the embodiment of the present application provides a technical solution, which separates the electrical cavity for accommodating the battery cell using a heat management member and the collection cavity for collecting the discharge products. When the pressure relief mechanism operates, the discharge products of the battery cell enter the collection cavity and do not enter or only slightly enter the electrical cavity, so that they will not conduct and short-circuit with the electrical connection members in the electrical cavity, thereby improving the safety of the battery. At the same time, after the discharge products generated after the battery cell runs away are discharged into the collection cavity, they pass through the pressure relief area and are discharged to the outside of the battery. By extending the discharge path of the discharge products, the temperature of the discharge products can be effectively reduced, the impact on the external environment of the battery caused by the discharge products can be reduced, and thereby the safety of the battery can be further improved.

[0076] The thermal management member is used to isolate an electrical cavity and a collection cavity such that the electrical cavity and the collection cavity are installed on both sides of the thermal management member. This thermal management member may contain a fluid to regulate the temperature of a plurality of battery cells. The fluid here may be a liquid or a gas, and regulating the temperature means heating or cooling a plurality of battery cells. When cooling or reducing the temperature of the battery cells, this thermal management member is used to contain a cooling fluid to lower the temperature of the plurality of battery cells. Also, the thermal management member may be used to heat the plurality of battery cells to raise their temperature, and the embodiments of the present application are not limited thereto. Optionally, the fluid may circulate to achieve a better temperature regulation effect. Optionally, the fluid may be water, a mixture of water and ethylene glycol, air, or the like.

[0077] The electrical cavity referred to in the present application may be used to accommodate a plurality of battery cells and busbar members. The electrical cavity may be sealed or unsealed. The electrical cavity provides an installation space for the battery cells and busbar members. In some embodiments, the electrical cavity may further be provided with a structure for fixing the battery cells. The shape of the electrical cavity may be determined by the number and shape of the battery cells and busbar members to be accommodated. In some embodiments, the electrical cavity may be a quadrilateral having six walls. The busbar member referred to in the present application is used to achieve electrical connection, such as parallel connection, series connection, or series-parallel connection, between a plurality of battery cells. The busbar member can achieve electrical connection between the battery cells by connecting the electrode terminals of the battery cells. In some embodiments, the busbar member may be fixed to the electrode terminals of the battery cells by welding.

[0078] The collection cavity referred to in this application is used to collect emissions and may be sealed or unsealed. In some embodiments, air or other gases may be included in the collection cavity. Optionally, a liquid, such as a cooling medium, may be included in the collection cavity, or a member for containing this liquid may be installed, so as to further lower the temperature of the emissions entering the collection cavity. Further optionally, the gas or liquid in the collection cavity circulates and flows.

[0079] The technical solutions described in the embodiments of this application are all applicable to various devices using batteries, such as mobile phones, portable devices, notebook computers, battery-powered vehicles, electric toys, power tools, electric vehicles, ships, and aircraft, etc. For example, aircraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0080] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but are also applicable to all devices using batteries. However, for the sake of brevity of description, the following embodiments will all be described by taking electric vehicles as examples.

[0081] For example, as shown in FIG. 1, it is a schematic structural diagram of a vehicle 1 according to an embodiment of this application. The vehicle 1 may be a fuel-powered vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle, etc. A motor 40, a controller 30, and a battery 10 may be installed inside the vehicle 1. 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, the front, or the rear of the vehicle 1. The battery 10 may be used to supply power to the vehicle 1. For example, the battery 10 may be used as the operating power supply of the vehicle 1 and used in the circuit system of the vehicle 1. For example, it is used for the starting, navigation, and operating power consumption requirements during the operation of the vehicle 1. In another embodiment of this application, the battery 10 can not only be used as the operating power supply of the vehicle 1, but also as the driving power supply of the vehicle 1 to provide driving power to the vehicle 1 instead of, or partly instead of, fuel oil or natural gas.

[0082] To meet different power consumption requirements, the battery of the present application may include a plurality of battery cells, where the plurality of battery cells may be connected in series, in parallel, or in a series-parallel combination, and the series-parallel connection is a mixture of series connection and parallel connection. The battery may be called a battery pack. Optionally, a plurality of battery cells are first connected in series, in parallel, or in a series-parallel combination to form a battery module, and then a plurality of battery modules are further connected in series, in parallel, or in a series-parallel combination to form a battery. That is, a plurality of battery cells may directly form a battery, or first form a battery module and then form a battery with the battery module.

[0083] For example, as shown in FIG. 2, it is a schematic structural diagram of the battery 10 of one embodiment of the present application. The battery 10 may include a plurality of battery cells 20. The battery 10 may further include a housing, the interior of the housing is a hollow structure, and the plurality of battery cells 20 are accommodated in the housing. As shown in FIG. 2, the housing may include two parts, hereinafter referred to as the first part 111 and the second part 112 respectively, and the first part 111 and the second part 112 are engaged. The shapes of the first part 111 and the second part 112 may be determined by the shape of the combination of the battery cells 20, and both the first part 111 and the second part 112 may have an opening. For example, both the first part 111 and the second part 112 may be hollow rectangular parallelepipeds and only one surface of each is an opening surface. The opening of the first part 111 and the opening of the second part 112 are arranged opposite to each other, and the first part 111 and the second part 112 are engaged with each other to form a housing having a sealed chamber. After the plurality of battery cells 20 are connected in parallel, in series, or in a series-parallel combination with each other and combined, they are placed in the housing formed by the engagement of the first part 111 and the second part 112.

[0084] Optionally, the battery 10 may further include other structures, which will not be described further herein. For example, the battery 10 may further include a busbar member for realizing an electrical connection between a plurality of battery cells, such as a parallel connection, a series connection, or a series-parallel connection. Specifically, the busbar member can realize an electrical connection between the battery cells by connecting the electrode terminals of the battery cells. Further, the busbar member can be fixed to the electrode terminals of the battery cells by welding. The electrical energy of the plurality of battery cells can be further drawn out through the housing via a conductive mechanism.

[0085] According to different power demands, the number of battery cells may be set to any value. The plurality of battery cells may be connected in series, in parallel, or in a series-parallel connection manner to achieve a relatively large capacity or power. Since the number of battery cells included in each battery 10 may be relatively large, in order to facilitate installation, the battery cells may be grouped and installed, and the battery cells in each group may form a battery module 200. The number of battery cells included in the battery module 200 is not limited and may be set according to demand. For example, FIG. 3 shows an example of a battery module. The battery may include a plurality of battery modules that can be connected in series, in parallel, or in a series-parallel connection manner.

[0086] As shown in FIG. 4, it is a schematic structural diagram of the battery cell 20 of the embodiment of the present application. The battery cell 20 includes one or more electrode assemblies 22, a case 211, and a cover plate 212. The case 211 and the cover plate 212 form a housing 21. The wall of the case 211 and the cover plate 212 are both called the wall of the battery cell 20. This battery cell 20 may further include two electrode terminals 214, and the two electrode terminals 214 may be installed on the cover plate 212. The cover plate 212 is generally flat, and the two electrode terminals 214 are fixed on the flat surface of the cover plate 212, and the two electrode terminals 214 are a positive electrode terminal 214a and a negative electrode terminal 214b respectively. One connection component 23 for realizing the electrical connection between the electrode assembly 22 and the electrode terminal 214 is respectively installed at each electrode terminal 214 and is located between the cover plate 212 and the electrode assembly 22.

[0087] As shown in FIG. 4, each electrode assembly 22 has a first tab 221a and a second tab 222a. The first tab 221a and the second tab 222a have opposite polarities. The first tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal via one connection component 23, and the second tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal via another connection component 23. In this battery cell 20, according to the actual usage requirements, one or more electrode assemblies 22 may be installed. As shown in FIG. 4, four independent electrode assemblies 22 are installed in the battery cell 20.

[0088] As shown in FIG. 5, it is a schematic structural diagram of the battery cell 20 including a pressure relief mechanism 213 according to another embodiment of the present application. The case 211, the cover plate 212, the electrode assembly 22, and the connection component 23 in FIG. 5 are the same as those in FIG. 4. For the sake of brevity, they will not be described further here.

[0089] A pressure relief mechanism 213 may be further installed in the battery cell shown in FIG. 5. In FIG. 5, the pressure relief mechanism 213 is installed on the bottom wall of the battery cell 20, that is, on the wall 21a in FIG. 5. Here, the pressure relief mechanism 213 may be a part of the wall 21a or may have a separate structure from the wall 21a, and may be fixed on the wall 21a by, for example, welding. When the pressure relief mechanism 213 is a part of the wall 21a, for example, the pressure relief mechanism 213 may be formed by making a cut on the wall 21a. The thickness of the wall 21a corresponding to this cut is smaller than the thickness of other regions of the pressure relief mechanism 213 except for the cut portion. The cut portion is the weakest position of the pressure relief mechanism 213. When the gas generated from the battery cell 20 is too much and the internal pressure of the case 211 rises to reach the threshold value, or when the temperature inside the battery cell 20 rises to reach the threshold value due to the heat generated by the internal reaction of the battery cell 20, the pressure relief mechanism 213 breaks at the cut portion, thereby communicating the inside and outside of the case 211, and the gas pressure and temperature are released to the outside due to the breakage of the pressure relief mechanism 213, and the explosion of the battery cell 20 can be further avoided.

[0090] In FIG. 5, the description is given by taking the example that the pressure relief mechanism 213 is located on the bottom wall of the battery cell 20. It should be understood that the pressure relief mechanism 213 in the embodiments of the present application may be located on the side wall of the case 211, or may be located on the cover plate 212, or may be located at the position where two walls of the case 211 intersect. The embodiments of the present application are not limited thereto.

[0091] The pressure relief mechanism 213 may have various possible pressure relief structures, and the embodiments of the present application are not limited thereto. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism configured to be melted when the internal temperature of the battery cell 20 where the pressure relief mechanism 213 is provided reaches the threshold value, and / or the pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism configured to break when the internal air pressure of the battery cell 20 where the pressure relief mechanism 213 is provided reaches the threshold value.

[0092] FIG. 6 shows a schematic diagram of a battery according to an embodiment of the present application. As shown in FIG. 6, the housing 11 may include an electrical cavity 11a, a collection cavity 11b, and a thermal management member 13.

[0093] In the current design of the discharge after the runaway of the battery cell, the discharged substances are generally discharged outside the battery immediately after passing through the collection cavity. However, since the temperature of the discharged substances is too high, the destruction of the collection cavity may be relatively large. The accumulation of high-temperature discharged substances is likely to cause a thermal runaway event, and the discharged substances passing through the collection cavity and discharged outside the battery have a relatively large impact on the external environment. The embodiment of the present application proposes a battery housing for these problems, separates the electrical cavity for accommodating the battery cell and the collection cavity for collecting the discharged substances by using a thermal management member. When the pressure relief mechanism operates, the discharged substances of the battery cell enter the collection cavity and do not enter or slightly enter the electrical cavity, so that they do not conduct and short-circuit with the electrical connection members in the electrical cavity, thereby improving the safety of the battery. At the same time, after the discharged substances generated after the battery cell runs away are discharged into the collection cavity, they are discharged outside the battery through the pressure relief area. By extending the discharge path of the discharged substances, the temperature of the discharged substances can be effectively reduced, and the impact of the discharged substances on the external environment of the battery can be reduced, thereby further improving the safety of the battery.

[0094] Here, the electrical cavity 11a is used to accommodate a plurality of battery cells 20, at least one of the plurality of battery cells 20 includes a pressure relief mechanism 213, and the pressure relief mechanism 213 is used to operate to release the internal pressure when the internal pressure or temperature of the battery cell 20 in which the pressure relief mechanism 213 is provided reaches a threshold value. The thermal management member 13 is used to accommodate a fluid to adjust the temperature of the plurality of battery cells 20, and the collection cavity 11b is used to collect the discharge from the battery cell 20 in which the pressure relief mechanism 213 is provided when the pressure relief mechanism 213 operates. Here, the thermal management member 13 is used to isolate the electrical cavity 11a and the collection cavity 11b, and the pressure relief mechanism 213 is installed on the thermal management member 13. The discharge collected by the collection cavity 11b is discharged through the pressure relief area.

[0095] Optionally, the electrical cavity 11a in the embodiments of the present application may also be used to accommodate the bus bar member 12, and the bus bar member 12 is used to realize the electrical connection of a plurality of battery cells 20. The bus bar member 12 can realize the electrical connection between the battery cells 20 by connecting the electrode terminals 214 of the battery cells 20.

[0096] For the convenience of description, in the following related description of the pressure relief mechanism 213, the battery cell 20 involved refers to the battery cell 20 in which the pressure relief mechanism 213 is provided. For example, the battery cell 20 may be the battery cell 20 in FIG. 5.

[0097] When reducing the temperature of the battery cell 20, the thermal management member 13 in the embodiments of the present application may accommodate a cooling medium to adjust the temperature of the plurality of battery cells 20. At this time, the thermal management member 13 may be referred to as a cooling member, a cooling system, a cooling plate, etc. Also, the thermal management member 13 may be used for heating, and the embodiments of the present application are not limited thereto. Optionally, the fluid may circulate to achieve a better temperature adjustment effect.

[0098] As one implementation method, in the embodiment of the present application, in the pressure relief area, the flow path is not installed in the heat management member 13.

[0099] By not installing a flow path at the corresponding position in the pressure relief area, it is possible to more easily allow the discharge in the collection cavity 11b to pass through the pressure relief area and be discharged from the collection cavity 11b.

[0100] In the embodiment of the present application, the heat management member 13 is used to isolate the electrical cavity 11a and the collection cavity 11b. The "isolation" mentioned here means separation, and it does not have to be airtight. That is, the electrical cavity 11a that houses a plurality of battery cells 20 and the collection cavity 11b that collects the discharge are separated. In this way, when the pressure relief mechanism 213 operates, the discharge of the battery cell 20 enters the collection cavity 11b and does not enter or only slightly enters the electrical cavity 11a, thereby not affecting the electrical connection in the electrical cavity 11a, and thus improving the safety of the battery.

[0101] Optionally, in one embodiment of the present application, the heat management member 13 has a common wall between the electrical cavity 11a and the collection cavity 11b. As shown in FIG. 6, the heat management member 13 may simultaneously be one wall of the electrical cavity 11a and one wall of the collection cavity 11b. That is, the heat management member 13 (or a part thereof) may directly serve as the common wall between the electrical cavity 11a and the collection cavity. In this way, the discharge of the battery cell 20 can pass through the heat management member 13 and enter the collection cavity 11b, and due to the presence of the heat management member 13, the discharge can be isolated from the electrical cavity 11a as much as possible, thereby reducing the risk of the discharge and improving the safety of the battery.

[0102] As an example, the heat management member 13 in the embodiments of the present application may include a first heat conduction plate and a second heat conduction plate as shown in FIGS. 7a to 7c. Here, FIG. 7a is a schematic plan view of one battery in the embodiments of the present application, FIG. 7b is a cross-sectional view of the housing in the embodiments of the present application along the A-A' direction, and FIG. 7c is a local detailed view corresponding to B in FIG. 7b.

[0103] As shown in FIGS. 7a to 7c, the heat management member 13 in the embodiments of the present application may include a first heat conduction plate 131 attached to a plurality of battery cells 20, a second heat conduction plate 132 disposed on the side of the first heat conduction plate 131 away from the battery cells 20, and a flow path 133 formed between the first heat conduction plate 131 and the second heat conduction plate 132 so that a fluid flows therethrough.

[0104] Optionally, the first heat conduction plate 131 in the embodiments of the present application may not be directly attached to the battery cells 20, and a heat insulation mat or the like may be installed between the first heat conduction plate 131 and the plurality of battery cells 20, and the present application is not limited thereto.

[0105] As shown in FIG. 7c, the first heat conduction plate 131 and the second heat conduction plate 132 may form a flow path 133 for accommodating a fluid. The first heat conduction plate 131 is located on the side close to the electrical cavity 11a of the second heat conduction plate 132 and is attached to the wall 21a.

[0106] Optionally, the materials of the first heat conduction plate 131 and the second heat conduction plate 132 may be metals. For example, aluminum or steel.

[0107] It should be understood that the above only exemplarily describes one implementation manner of the heat management member 13, and the embodiments of the present application are not limited thereto.

[0108] In the current discharge scheme of battery emissions, after the emissions enter the collection cavity 11b, they are directly discharged outside the battery 10. At this time, since the temperature of the emissions is extremely high, there is a possibility of damaging the bottom of the battery housing 11. High-temperature emissions are likely to accumulate and cause thermal runaway. Moreover, after the high-temperature emissions are discharged from the battery 10, the threat to the external environment of the battery 10 is relatively large.

[0109] Based on this, due to the pressure relief area installed on the heat management member 13 in the embodiment of the present application, the emissions collected in the collection cavity 11b can be discharged outside the collection cavity 11b after passing through the pressure relief area.

[0110] By the method of installing the pressure relief area on the heat management member 13, the discharge path of the emissions collected in the collection cavity 11b can be extended, and the temperature of the emissions can be further reduced. Thereby, the influence on the external environment caused by the high-temperature emissions can be reduced, and the safety of the battery can be improved.

[0111] As one implementation method, the pressure relief area in the embodiment of the present application may be installed offset from the pressure relief mechanism 213.

[0112] By installing the pressure relief area offset from the pressure relief mechanism 213, the exhaust path can be extended, and the temperature of the emissions can be further reduced.

[0113] In the embodiment of the present application, being installed offset may mean that they are not installed corresponding to each other in position, but rather are offset from each other.

[0114] Optionally, the pressure relief area is a pressure relief hole, and the emissions collected by the collection cavity 11b pass through the pressure relief hole and are discharged, or the pressure relief area is a fragile area, and the emissions collected by the collection cavity 11b may be discharged after breaking the fragile area.

[0115] For example, when the pressure relief area is a pressure relief hole, the discharge in the collection cavity 11b can pass directly through the pressure relief hole, enter a specific exhaust path, and then be discharged from the battery housing 11. When the pressure relief area is a fragile area, for example, the fragile area can be thinned on the heat management member 13, or a material different from other areas on the heat management member 13, such as a material with a lower melting point, can be used in the area where the fragile area is located. When the temperature or pressure of the discharge in the collection cavity 11b reaches a certain threshold value, it can break through the fragile area, enter a specific discharge path, and be discharged from the battery housing 11.

[0116] It should be understood that the pressure relief hole and the fragile area in the embodiments of the present application are only examples for describing possible implementation manners of the pressure relief area, but the embodiments of the present application are not limited thereto.

[0117] As an example, the electrical cavity 11a in the embodiments of the present application may include a first pressure balance mechanism for balancing the pressure inside and outside the housing. After passing through the pressure relief area, the discharge is discharged to the outside of the housing through the first pressure balance mechanism. The discharge in the collection cavity 11b can enter a specific exhaust path after passing through the pressure relief area and be discharged to the outside of the housing 11 through the first pressure balance mechanism.

[0118] By installing the first pressure balance mechanism, the discharge can be discharged from the electrical cavity in a timely manner, and the influence of the discharge on other battery cells can be reduced.

[0119] It should be understood that the pressure balance mechanism in the embodiments of the present application means that the housing 11 can balance the pressures on both sides of the pressure balance mechanism by opening and closing the pressure balance mechanism. This first pressure balance mechanism may be opened and closed in one direction. At this time, the first pressure balance mechanism can release the internal pressure of the battery housing 11 to the outside of the battery housing 11, or this first pressure balance mechanism may be opened and closed in both directions, thereby balancing the pressures inside and outside the battery housing 11. The present application is not limited thereto.

[0120] Optionally, the first pressure balance mechanism in the embodiments of the present application may be one or more, and the number can be set according to the actual situation. The embodiments of the present application are not limited thereto.

[0121] Optionally, the first pressure balance mechanism in the embodiments of the present application may be a pressure relief valve, or other balance mechanisms that can balance the pressures inside and outside the housing 11, or the first pressure balance mechanism in the embodiments of the present application may be a through hole.

[0122] The emissions in the collection cavity 11b are discharged to the outside of the housing 11 through the pressure relief area and the first pressure balance mechanism, extending the exhaust path of the emissions, further reducing the temperature of the emissions, and reducing the impact of the high-temperature emissions on the battery housing 11 and the external environment, thereby improving the safety of the battery.

[0123] Optionally, in the embodiments of the present application, the emissions in the collection cavity 11b can enter a specific exhaust path after passing through the pressure relief area and then be discharged to the outside of the battery housing 11 through the first pressure balance structure. Here, this specific exhaust path may include a chamber separated from and independent of the chamber for accommodating the battery cells, or may enter the inside of the hollow cross beam after passing through the pressure relief area.

[0124] The following describes these two implementation methods.

[0125] As a first type of implementation method, the electric cavity 11a in the embodiment of the present application may include a first sub-cavity 111a and a second sub-cavity 112a. Here, the first sub-cavity 111a is used to accommodate a plurality of battery cells 20, and the second sub-cavity 112a is installed adjacent to the first sub-cavity 111a. A first pressure balance mechanism 15 is installed on the outer wall of the second sub-cavity 112a. The exhaust gas collected by the collection cavity 11b enters the second sub-cavity 112a through the pressure release area and is discharged to the outside of the housing 11 through the first pressure balance mechanism 15.

[0126] As shown in FIGS. 8a to 8b, where FIG. 8a is an exploded view of one battery in the embodiment of the present application, and FIG. 8b is a schematic plan view corresponding to the battery in FIG. 8a. As shown in FIG. 8a, the electric cavity 11a may include a first sub-cavity 111a and a second sub-cavity 112a. The first sub-cavity 111a may be used to accommodate a plurality of battery cells 20. Here, the first sub-cavity 111a and the second sub-cavity 112a are spaces isolated from each other, preventing the exhaust gas entering the second sub-cavity 112a from entering the first sub-cavity 111a that houses the battery cells 20, thereby ensuring the safety performance of the battery.

[0127] It should be understood that in the embodiment of the present application, only one second sub-cavity 112a is described as an example, but its specific number and position can be set according to the actual situation, and the embodiment of the present application is not limited thereto. Also, in the embodiment of the present application, an example is shown in which the first sub-cavity 111a may be divided into four parts by the hollow cross beam 113a in the electric cavity 11a, but the embodiment of the present application is not limited thereto.

[0128] To ensure that the emissions in the collection cavity 11b smoothly enter the second sub-cavity 112a, a pressure relief hole 14 may be installed on the heat management member 13, or it may be a thinned and fragile area. The embodiments of the present application are not limited thereto.

[0129] Optionally, this pressure relief hole 14 is installed in the area corresponding to the second sub-cavity 112a on the heat management member 13. In this way, the emissions in the collection cavity 11b can enter the second sub-cavity 112a through the pressure relief hole 14.

[0130] Furthermore, in order for the emissions that have entered the second sub-cavity 112a to be discharged outside the housing 11, a first pressure balance mechanism 15 may be installed on the outer wall of the second sub-cavity 112a. The emissions collected in the collection cavity 11b pass through the pressure relief hole 14 and then enter the second sub-cavity 112a. After the pressure or temperature in the second sub-cavity 112a reaches a certain threshold value, they can be discharged from the first pressure balance mechanism 15 installed on the outer wall of the second sub-cavity 112a to the outside of the battery housing.

[0131] In the embodiments of the present application, by installing the second sub-cavity 112a in the electrical cavity 11a, a buffer area for emissions can be set, the emissions can be isolated from the plurality of battery cells, and the influence of the emissions on the battery cells in the first sub-cavity 111a can be reduced.

[0132] The housing 11 in the embodiments of the present application may further include a top cover, for example, the top cover 114 shown in FIG. 8a. Here, this top cover 114 may correspond to the first portion 111 in FIG. 2. The electrical cavity 11a and the collection cavity 11b may correspond to the second portion 112 in FIG. 2 as a whole. Alternatively, optionally, the top cover 114 may correspond only to the upper surface in the first portion 111 in FIG. 2. The portion composed of the peripheral portion of the first portion 111 and the second portion 112 may correspond to the whole composed of the electrical cavity 11a and the collection cavity 11b. Specifically, it can be set according to the actual situation, and the embodiments of the present application are not limited thereto.

[0133] When the battery cell undergoes thermal runaway, the battery cell 20 can generally discharge the internal pressure and temperature through the corresponding pressure relief mechanism 213. However, in some specific scenarios, when the battery cell 20 undergoes thermal runaway, the pressure inside the battery cell 20 is not discharged from the pressure relief mechanism 213, but escapes from other positions of the case 211 and is discharged into the electrical cavity 11a. As a result, the internal pressure and temperature in the electrical cavity 11a increase. If the gas cannot be discharged outside the battery 10 in a timely manner, the internal pressure of the battery 10 will increase, and the mechanical components of the battery 10 will be damaged. Or, in scenarios such as when the elevation of the battery 10 changes, if it leads to a change in the pressure inside and outside the battery 10, the pressure inside and outside the electrical cavity 11a may not be able to quickly recover to a balanced state.

[0134] In response to the above problems, in the embodiments of the present application, a second pressure balance mechanism 16 may be installed on the common wall between the first sub-cavity 111a and the second sub-cavity 112a. The second pressure balance mechanism 16 may be used to balance the pressure between the first sub-cavity 111a and the second sub-cavity 112a.

[0135] FIG. 9 shows a schematic plan view of a battery in which a second pressure balance mechanism of an embodiment of the present application is installed. Here, FIG. 9 may be a schematic view in the case where one second sub-cavity 112a is installed corresponding to the housing 11.

[0136] It should be understood that the above only exemplarily describes the arrangement method of the second pressure balance mechanism, and the embodiments of the present application are not limited thereto.

[0137] As shown in FIG. 9, one second pressure balance mechanism 16 may be installed on the common wall of the first sub-cavity 111a and the second sub-cavity 112a.

[0138] When the exhaust gas generated by the battery cell 20 is not discharged through the pressure release mechanism 213 but is discharged through other positions of the case 211, after the pressure and temperature in the first sub-cavity 111a reach a certain threshold value, the exhaust gas in the first sub-cavity 111a can be discharged into the second sub-cavity 112a through the second pressure balance mechanism 16. Then, after the pressure or temperature in the second sub-cavity 112a reaches a certain threshold value, the exhaust gas can be discharged through the first pressure balance mechanism 15.

[0139] Optionally, the second pressure balance mechanism 16 in the embodiment of the present application is opened and closed in one direction, and the second pressure balance mechanism 16 is used to release the internal pressure to the second sub-cavity 112a when the pressure or temperature in the first sub-cavity 111a reaches a certain threshold value.

[0140] As one implementation manner, the first sub-cavity 111a and the second sub-cavity 112a in the embodiment of the present application may communicate with each other only through the second pressure balance mechanism 16.

[0141] By arranging the first sub-cavity 111a and the second sub-cavity 112a to communicate only through the second pressure balance mechanism 16, when the battery cell 20 undergoes thermal runaway, the emissions in the second sub-cavity 112a cannot enter the first sub-cavity 111a through other paths, preventing the emissions at high temperature from affecting the battery cells 20 that are not in thermal runaway within the first sub-cavity 111a.

[0142] It should be understood that the above takes the example of the battery cell 20 undergoing thermal runaway and releasing pressure. However, the embodiments of the present application may also be applied when the internal and external pressure balance is disrupted due to changes in the external environment of the battery 10, and the present application is not limited thereto.

[0143] In the embodiments of the present application, the second pressure balance mechanism 16 is installed in the first sub-cavity 111a that houses the battery cell 20. When the battery cell 20 runs away, the emissions that have not been discharged through the pressure release mechanism 213 can be smoothly discharged into the second sub-cavity 112a through the second pressure balance mechanism 16, and then discharged outside the battery 10 through the first pressure balance mechanism 15. On the other hand, it ensures that the internal pressure of the electrical cavity 11a is discharged in a timely manner, avoiding the occurrence of disaster problems due to the internal temperature or pressure of the battery 10 being too high. Also, it can extend the discharge path of the emissions, reduce the temperature of the emissions, and reduce the impact of the emissions on the external environment, thereby further improving the safety of the battery.

[0144] As one implementation method, in the embodiments of the present application, a third pressure balance mechanism is installed on the walls of the first sub-cavity 111a other than the common wall with the second sub-cavity 112a. The third pressure balance mechanism is used to release the internal pressure to the outside of the housing 11 when the pressure or temperature in the first sub-cavity 111a reaches a certain threshold value.

[0145] By installing a third pressure balance mechanism on other walls of the first sub-cavity 111a except for the common wall with the second sub-cavity 112a, the internal pressure and temperature of the battery cell 20 in the first sub-cavity 111a that has experienced thermal runaway can be timely discharged through the third pressure balance mechanism, thereby balancing the internal and external air pressures between the first sub-cavity 111a and the second sub-cavity 112a.

[0146] Optionally, a hollow cross beam 113a may be installed in the electrical cavity 11a in the embodiments of the present application. The first wall of the second sub-cavity 112a is formed by at least a part of the hollow cross beam. A fourth pressure balance mechanism is installed on the first wall. The discharge material collected by the collection cavity enters the hollow cross beam through the pressure release area, then enters the second sub-cavity through the fourth pressure balance mechanism, and is further discharged to the outside of the housing through the first pressure balance mechanism.

[0147] Specifically, as shown in FIG. 10, a fourth pressure balance mechanism 17 is installed on the common first wall 20a between the hollow cross beam 113a and the second sub-cavity 112a. The discharge material that enters the hollow cross beam 113a through the pressure release hole 14 can enter the second sub-cavity 112a through the fourth pressure balance mechanism 17. When the internal pressure and temperature in the second sub-cavity 112a reach a certain threshold value, it is discharged to the outside of the battery housing 11 through the first pressure balance mechanism 15, thereby balancing the air pressure inside and outside the battery.

[0148] Optionally, the above-mentioned hollow cross beam 113a and the hollow cross beam 113a in the following text may refer to the same hollow cross beam, or they may be different hollow cross beams. The present application is not limited thereto.

[0149] As a second implementation method, a hollow cross beam 113a for connection to the outer wall of the electric cavity 11a may be installed in the electric cavity 11a in the embodiment of the present application. A fifth pressure balance mechanism 18 is installed on the outer wall of the electric cavity 11a. The exhaust discharged by the collection cavity 11b passes through the pressure release area and enters the hollow cross beam 113a, and is discharged to the outside of the housing 11 through the fifth pressure balance mechanism 18.

[0150] It should be understood that the outer wall of the housing 11 related to the embodiment of the present application may be a wall that directly contacts the air outside the housing 11.

[0151] As shown in FIGS. 11a to 11c, where FIG. 11a is an exploded view of another battery in the embodiment of the present application, FIG. 11b is a schematic plan view corresponding to the battery in FIG. 11a, and FIG. 11c is an exploded view corresponding to the heat management member and the hollow cross beam in FIG. 11a. As shown in FIG. 11a, the electric cavity 11a may include one or more hollow cross beams 113a that can partition a plurality of battery cells 20. Here, the one or more hollow cross beams 113a may include hollow cross beams 113a installed along the arrangement direction of a plurality of adjacent battery cells, and may also include hollow cross beams 113a perpendicular to the arrangement direction of the battery cells.

[0152] Correspondingly, a pressure release area, such as the pressure release hole 14 shown in FIG. 11c, or a fragile area, may be installed at a position corresponding to the bottom of the hollow cross beam 113a on the heat management member 13. In this way, the exhaust in the collection cavity 11b can enter the hollow cross beam 113a through the pressure release hole 14. Optionally, when the heat management member 13 in the embodiment of the present application includes a first heat conduction plate 131 and a second heat conduction plate 132, pressure release holes 14 corresponding to the hollow cross beam 113a are installed in both the first heat conduction plate 131 and the second heat conduction plate 132.

[0153] It should be understood that FIG. 11c only exemplarily describes one way in which one hollow cross beam 113a in the housing 11 corresponds to the pressure relief hole 14 on the heat management member 13. For other hollow cross beams 113a in the embodiments of the present application, they may correspond to the pressure relief holes 14 at other positions on the heat management member 13 such that the exhaust gas in the collection cavity 11b enters into the hollow cross beam 113a through the pressure relief hole 14. The present application is not limited thereto.

[0154] Optionally, in the embodiments of the present application, the pressure relief hole 14 is installed corresponding to the hollow cross beam 113a. For example, by drilling a hole at the bottom of the hollow cross beam 113a, the pressure relief hole 14 and the hollow cross beam 113a may be communicated with each other. Or, the hollow cross beam 113a may not be provided with a bottom wall, and the heat management member 13 may directly serve as its bottom wall. The embodiments of the present application are not limited thereto.

[0155] Furthermore, a fifth pressure balance mechanism 18 may be installed on the outer wall of the housing 11. After the exhaust gas collected by the collection cavity 11b passes through the pressure relief hole 14 and enters into the hollow cross beam 113a, when the internal pressure or temperature of the hollow cross beam 113a reaches a certain threshold value, it can be discharged to the outside of the battery housing 11 through the fifth pressure balance mechanism 18 on the outer wall.

[0156] It should be understood that between the plurality of hollow cross beams 113a in the embodiments of the present application and the outer wall where the fifth pressure balance mechanism 18 is installed, they are in communication with each other.

[0157] Here, FIG. 12a shows a cross-sectional view of the housing of the embodiment of the present application along the A-A' direction in FIG. 11b, and FIG. 12b is a local detailed view corresponding to the hollow cross beam 113a in FIG. 12a.

[0158] In an embodiment of the present application, a hollow cross beam 113a communicating with each other is installed, and a fifth pressure balance mechanism 18 is installed on the outer wall of the housing 11, so as to lengthen the exhaust path of the exhaust gas collected in the collection cavity 11b, reduce the influence of the exhaust gas on the collection cavity 11b, further lower the temperature of the exhaust gas, reduce the influence of the high-temperature exhaust gas on the external environment, thereby improving the safety performance of the battery.

[0159] It should be understood that the above two methods of extending the exhaust path by the second sub-cavity 112a and the hollow cross beam 113a may be implemented alone or both may be implemented simultaneously, and the embodiments of the present application are not limited thereto.

[0160] As one implementation method, in an embodiment of the present application, the collection cavity 11b may be formed by the heat management member 13 and the protective component. For example, as shown in FIG. 13, the housing 11 further includes a protective component 115. The protective component 115 is used to protect the heat management member 13, and the protective component 115 and the heat management member 13 form the collection cavity 11b.

[0161] Since the collection cavity 11b formed by the protective component 115 and the heat management member 13 does not occupy the space for accommodating the battery cells, a relatively large collection cavity 11b may be installed, thereby effectively collecting and buffering the exhaust gas and reducing its risk.

[0162] Optionally, in an embodiment of the present application, a fluid, such as a cooling medium, may be further installed in the collection cavity 11b, or a member for accommodating this fluid may be installed, thereby further reducing the temperature of the exhaust gas entering the collection cavity 11b.

[0163] Optionally, in an embodiment of the present application, the collection cavity 11b may be a sealed chamber. For example, the connection part between the protective component 115 and the heat management member 13 may be sealed with a sealing member.

[0164] In order to further reduce the influence of high-temperature exhaust on the exhaust path, a temperature-lowering material may also be installed on the surface of the hollow cross beam 113a and / or the heat management member 13 (for example, the surface separated from the plurality of battery cells 20 of the heat management member 13) and / or the protective component 115 in the embodiments of the present application.

[0165] Here, the temperature-lowering material installed on the heat management member 13 may be installed on its bottom wall and avoid the positions corresponding to the pressure release mechanism 213 and the positions corresponding to the pressure release area. In this way, the temperature-lowering material installed on the bottom wall of the heat management member 13 can lower the temperature of the exhaust entering the collection cavity 11b after passing through the heat management member 13, thereby reducing the influence of the high-temperature exhaust on the housing 11 and further reducing the influence of the high-temperature exhaust on the external environment of the battery 10.

[0166] As shown in FIGS. 14a to 14d, where FIG. 14a is a cross-sectional view taken along the A-A' direction in FIG. 8b, FIG. 14b is a local detailed view corresponding to D in FIG. 14a, FIG. 14c is a schematic layout diagram of the temperature-lowering material on the heat management member, and FIG. 14d is an exploded view of the temperature-lowering material and the heat management member. As shown in FIGS. 14b and 14c, the temperature-lowering material 60 is disposed on the bottom wall of the heat management member 13 and may be offset from the positions corresponding to the pressure release mechanism 213 and the pressure release hole 14. Here, when the heat management member 13 includes the first heat conduction plate 131 and the second heat conduction plate 132, the temperature-lowering material 60 is installed at the bottom of the second heat conduction plate 132.

[0167] As one implementation method, the temperature-lowering material may be installed at a position corresponding to the pressure release mechanism 213 on the protective component 115.

[0168] FIG. 15 shows a schematic diagram of a cooling material installed on one of the protective components of the present application. Here, FIG. 15 is a local detailed view corresponding to position E in FIG. 11a. As shown in FIG. 15, the cooling material 60 may be installed at a position corresponding to the pressure relief mechanism 213 on the protective component 115. In this way, the emissions discharged from the pressure relief mechanism 213 can be directly cooled in temperature by the cooling material on the protective component 115, thereby reducing the impact on the housing 11 caused by the high-temperature emissions and further reducing the impact on the external environment of the battery 10 caused by the high-temperature emissions.

[0169] Optionally, in the embodiments of the present application, a cooling material may be installed inside the hollow cross beam 113a, and the embodiments of the present application are not limited to a specific arrangement method.

[0170] It should be understood that the above only exemplarily lists the arrangement methods of a plurality of cooling materials, and the present application is not limited to its specific arrangement method.

[0171] Optionally, the cooling material adopted in the embodiments of the present application may be a phase change material (PCM) coating. The phase change material can melt after contacting the high-temperature emissions and reduce the temperature of the emissions.

[0172] Optionally, in the embodiments of the present application, a high-temperature resistant material, such as mica paper, etc., may be attached to the bottom walls of the protective component 115 and the heat management member 13. By attaching the high-temperature resistant material, the impact on the surface of the exhaust path caused by the high-temperature emissions can be reduced.

[0173] Optionally, the cooling material in the embodiments of the present application may be installed on the high-temperature resistant material, thereby achieving a temperature reduction of the emissions and protecting the surface of the region through which the emissions pass.

[0174] As one implementation, in the embodiment of the present application, the thermal management member 13 may be configured such that when the pressure relief mechanism 213 operates, the exhaust can pass through the thermal management member 13 and enter the collection cavity 11b.

[0175] Optionally, when the pressure relief mechanism 213 operates, the thermal management member 13 may be destroyed. For example, a weak area may be provided on the thermal management member 13, and the weak area may be destroyed, so that the exhaust can pass through the thermal management member 13 and enter the collection cavity 11b.

[0176] It should be understood that in addition to a destructible structure (such as the above-mentioned weak area) being provided on the thermal management member 13 when the pressure relief mechanism 213 operates, a destruction device may be provided on the pressure relief mechanism 213. The destruction device is used to destroy the thermal management member 13 when the pressure relief mechanism 213 operates so that the fluid can be discharged from the inside of the thermal management member 13. For example, the destruction device may be a spike, but the embodiment of the present application is not limited thereto.

[0177] Alternatively or optionally, through holes corresponding to the pressure relief mechanism 213 may be provided on the thermal management member 13. After the pressure relief mechanism 213 operates, the exhaust can enter the collection cavity 11b through the through holes on the thermal management member 13.

[0178] The following describes two cases of the above-mentioned thermal management member 13 respectively.

[0179] To ensure that the battery cell can discharge the exhaust to the outside when the pressure relief mechanism opens smoothly, a retreat structure may be provided on the surface of the thermal management member 13 of the present application close to the battery cell 20, which is configured to provide a space allowing the operation of the pressure relief mechanism 213.

[0180] As one embodiment, here, the thermal management member 13 may be attached to a plurality of battery cells 20 so as to form a retreat cavity between the retreat structure and the pressure relief mechanism 213.

[0181] FIG. 16 shows a schematic view of the retraction structure of the embodiment of the present application being a retraction cavity. Here, specifically, this retraction cavity 134 may be the retraction cavity 134 formed by the first region 131a of the first heat conduction plate 131 in the embodiment of the present application being recessed into the second heat conduction plate 132. The first region 131a is connected to the second heat conduction plate 132. Specifically, FIG. 7c may be referred to. In this way, there is no flow path in the bottom wall of the retraction cavity 134, and a flow path 133 is formed around the retraction cavity 134, facilitating being destroyed by the discharge of the pressure relief mechanism.

[0182] Optionally, the retraction cavity 134 includes a retraction bottom wall and a retraction side wall surrounding the retraction cavity 134.

[0183] As another embodiment, the retraction structure is a through hole penetrating the heat management member 13, and the retraction side wall of the retraction structure is the hole wall of the through hole.

[0184] FIG. 17 shows a schematic view of the retraction structure of the embodiment of the present application being a through hole. As shown in FIG. 17, this retraction structure is a through hole 137. The through hole 137 can, on the one hand, be used as a retraction structure, and on the other hand, when the pressure relief mechanism 213 operates, the discharge from the battery cell 20 where the pressure relief mechanism 213 is provided can pass through the through hole 137 and enter the collection cavity 11b.

[0185] Optionally, the through hole 137 may be installed facing the pressure relief mechanism 213.

[0186] By installing the through hole 137 corresponding to the pressure relief mechanism 213, a deformation space can be provided for the pressure relief mechanism 213, so that when the pressure relief mechanism 213 operates, the discharge can be discharged into the collection cavity 11b through the through hole 137.

[0187] As one implementation, the thermal management member 13 in the embodiment of the present application may be configured to be destroyed so that the fluid flows out when the pressure relief mechanism operates.

[0188] Corresponding to the above-described retreat cavity 134 and through hole 137, the side walls of the retreat cavity 134 and the through hole 137 may both be destroyed. Specifically, when the pressure relief mechanism 213 operates, the discharge of the battery cell 20 rushes into the retreat cavity 134 or the through hole 137. Since the discharge is a high-pressure and high-temperature discharge, when the discharge passes through the retreat cavity 134 or the through hole 137, the hole walls of the retreat cavity 134 or the through hole 137 also melt, and the fluid is discharged from the inside of the thermal management member 13, thereby reducing the temperature of the discharge.

[0189] By discharging the fluid from the inside of the thermal management member 13, the heat of the battery cell 20 can be absorbed, the temperature of the discharge can be reduced, and the danger of the discharge can be further reduced. In such a case, the fluid and the discharge cooled by the fluid enter the collection cavity 11b together. Since the temperature of the discharge of the battery cell 20 can be rapidly reduced by cooling the fluid, the danger of the discharge entering the collection cavity 11b has already been significantly reduced, and it will not have a relatively large impact on other parts of the battery (for example, other battery cells 20). Thereby, the destructiveness caused by the abnormality of a single battery cell 20 can be quickly suppressed, and the possibility of the battery explosion can be reduced.

[0190] As one implementation, the battery 10 in the embodiment of the present application includes a plurality of battery cells 20, and at least one of these plurality of battery cells 20 includes a pressure relief mechanism 213. The pressure relief mechanism 213 is used to operate to release the internal pressure when the internal pressure or temperature of the battery cell 20 where the pressure relief mechanism 213 is provided reaches a threshold value. It may include a plurality of battery cells 20 and the housing 11 in each of the above embodiments.

[0191] One embodiment of the present application further provides a power consumption device, which may include the battery 10 in each of the above embodiments. Optionally, the power consumption device may be a vehicle 1, a ship, or an aircraft.

[0192] The above text describes the housing of the battery, the battery, and the power consumption device of the embodiments of the present application. The following describes the manufacturing method and device of the battery of the embodiments of the present application. For parts not described in detail here, reference may be made to the above embodiments.

[0193] FIG. 18 shows a schematic flowchart of a battery manufacturing method 300 according to an embodiment of the present application. As shown in FIG. 18, this method 300 may include the following steps.

[0194] In S310, a plurality of battery cells 20 are provided, and at least one battery cell 20 among the plurality of battery cells 20 includes a pressure relief mechanism 213. The pressure relief mechanism 213 is used to operate to release the internal pressure when the internal pressure or temperature of the battery cell 20 where the pressure relief mechanism 213 is provided reaches a threshold value.

[0195] In S320, a housing 11 is provided. The housing 11 includes an electrical cavity 11a for accommodating the plurality of battery cells 20, a thermal management member 13 for accommodating a fluid to adjust the temperature of the plurality of battery cells 20, and a collection cavity 11b for collecting the discharge from the battery cell 20 where the pressure relief mechanism 213 is provided when the pressure relief mechanism 213 operates.

[0196] In S330, here, the thermal management member 13 is used to isolate the electrical cavity 11a and the collection cavity 11b. A pressure relief area is installed on the thermal management member 13, and the discharge collected by the collection cavity 11b is discharged through the pressure relief area.

[0197] In S340, the plurality of battery cells 20 are accommodated in the electrical cavity 11a.

[0198] FIG. 19 shows a schematic block diagram of a battery manufacturing apparatus 400 according to an embodiment of the present application. As shown in FIG. 19, the battery manufacturing apparatus 400 may include a first providing module 410, a second providing module 420, and an attaching module 430.

[0199] The first providing module 410 is used to provide a plurality of battery cells 20. At least one of the plurality of battery cells 20 includes a pressure relief mechanism 213. The pressure relief mechanism 213 is used to operate so as to release the internal pressure when the internal pressure or temperature of the battery cell 20 in which the pressure relief mechanism 213 is provided reaches a threshold value.

[0200] The second providing module 420 is used to provide a housing 11. The housing 11 includes an electrical cavity 11a for accommodating the plurality of battery cells 20, a thermal management member 13 for accommodating a fluid to adjust the temperature of the plurality of battery cells 20, and a collection cavity 11b for collecting discharges from the battery cell 20 in which the pressure relief mechanism 213 is provided when the pressure relief mechanism 213 operates. Here, the thermal management member 13 is used to isolate the electrical cavity 11a and the collection cavity 11b. A pressure relief area is installed on the thermal management member 13, and the discharges collected by the collection cavity 11b are further discharged through the pressure relief area.

[0201] The attaching module 430 is used to accommodate the plurality of battery cells 20 in the electrical cavity 11b.

[0202] The present application has been described with reference to preferred embodiments. However, various improvements may be made without departing from the scope of the present application, and members thereof may be replaced with equivalents. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Description of Symbols

[0203] 1 Vehicle 10 Battery 11 Housing 11a Electrical Cavity 11b Collection Cavity 12 Busbar Member 13 Thermal Management Member 14 Pressure Relief Hole 15 First Pressure Balance Mechanism 16 Second Pressure Balance Mechanism 17 Fourth Pressure Balance Mechanism 18 Fifth Pressure Balance Mechanism 20 Battery Cell 20a First Wall 21 Housing 21a Wall 22 Electrode Assembly 23 Connecting Component 30 Controller 40 Motor 60 Cooling Material 111 First Part 111a First Sub - Cavity 112 Second Part 112a Second Sub - Cavity 113a Hollow Cross - Beam 114 Top Cover 115 Protective Component 131 First Heat Conductive Plate 131a First Region 132 Second Heat Conductive Plate 133 Flow Path 134 Retreating Cavity 137 Through - Hole 200 Battery Module 211 Case 212 Cover Plate 213 Pressure Relief Mechanism 214 Electrode Terminal 214a Positive Electrode Terminal 214b Negative Electrode Terminal 221a First Tab Second tab 222a Manufacturing apparatus 400 First providing module 410 Second providing module 420 Attachment module 430

Claims

1. A battery housing, an electrical cavity for accommodating a plurality of battery cells, wherein at least one of the plurality of battery cells includes a pressure relief mechanism, and the pressure relief mechanism is used to operate to release the internal pressure when the internal pressure or temperature of the battery cell in which the pressure relief mechanism is provided reaches a threshold value; an electrical cavity, a thermal management member for accommodating a fluid to adjust the temperature of the plurality of battery cells; a collection cavity for collecting emissions from the battery cell in which the pressure relief mechanism is provided when the pressure relief mechanism operates, wherein the thermal management member is used to isolate the electrical cavity from the collection cavity, a pressure relief area is installed on the thermal management member, and the emissions collected by the collection cavity pass through the pressure relief area and are discharged to the outside of the collection cavity, wherein the thermal management member is configured such that when the pressure relief mechanism operates, the emissions can pass through the thermal management member and enter the collection cavity, the housing.

2. The housing according to claim 1, wherein the pressure relief area is installed offset from the pressure relief mechanism.

3. The pressure relief area is a pressure relief hole, and the emissions collected by the collection cavity are discharged through the pressure relief hole, or The pressure relief area is a fragile area, and the emissions collected by the collection cavity are discharged after breaking the fragile area. The housing according to claim 1 or 2.

4. The electrical cavity includes a first pressure balance mechanism for balancing the pressure inside and outside the housing, and the emissions pass through the pressure relief area and are then discharged to the outside of the housing through the first pressure balance mechanism. The housing according to any one of claims 1 to 3.

5. The electrical cavity includes a first sub-cavity and a second sub-cavity. The first sub-cavity is used to accommodate the plurality of battery cells, and the second sub-cavity is installed adjacent to the first sub-cavity. The first pressure balance mechanism is installed on the outer wall of the second sub-cavity. The emissions collected by the collection cavity enter the second sub-cavity through the pressure relief area and are discharged to the outside of the housing through the first pressure balance mechanism. The housing according to claim 4.

6. The pressure relief area is installed in an area corresponding to the second sub-cavity of the heat management member, the housing according to claim 5.

7. A second pressure balance mechanism is installed on a common wall between the first sub-cavity and the second sub-cavity, and the second pressure balance mechanism is used to balance the pressure between the first sub-cavity and the second sub-cavity, the housing according to claim 5 or 6.

8. The second pressure balance mechanism opens and closes in one direction, and the second pressure balance mechanism is used to release the internal pressure to the second sub-cavity when the pressure or temperature in the first sub-cavity reaches a certain threshold value, the housing according to claim 7.

9. The first sub-cavity and the second sub-cavity communicate with each other only through the second pressure balance mechanism, the housing according to claim 8.

10. A third pressure balance mechanism is installed on another wall of the first sub-cavity except the common wall with the second sub-cavity, and the third pressure balance mechanism is used to release the internal pressure to the outside of the housing when the pressure or temperature in the first sub-cavity reaches a certain threshold value, the housing according to any one of claims 5 to 9.

11. A hollow cross beam is installed in the electrical cavity, the first wall of the second sub-cavity is formed by at least a part of the hollow cross beam, a fourth pressure balance mechanism is installed on the first wall, the discharge collected by the collection cavity passes through the pressure relief area and enters the hollow cross beam, and further passes through the fourth pressure balance mechanism and enters the second sub-cavity, and further passes through the first pressure balance mechanism and is discharged to the outside of the housing, the housing according to any one of claims 5 to 10.

12. A hollow cross beam for connecting to the outer wall of the electrical cavity is installed in the electrical cavity, a fifth pressure balance mechanism is installed on the outer wall of the electrical cavity, the discharge collected by the collection cavity passes through the pressure relief area and enters the hollow cross beam, and passes through the fifth pressure balance mechanism and is discharged to the outside of the housing, the housing according to any one of claims 1 to 3.

13. The pressure relief area is installed in the area corresponding to the hollow cross beam of the heat management member, and the housing according to claim 11 or 12.

14. In the hollow cross beam, a temperature reduction material is installed, and the housing according to any one of claims 11 to 13.

15. On the surface of the heat management member that is separated from the battery cell, a temperature reduction material is installed, and the housing according to any one of claims 1 to 14.

16. The housing is further includes a protective component located on the side of the heat management member that is separated from the battery cell, the protective component and the heat management member form the collection cavity, and a temperature reduction material is installed on the protective component, and the housing according to any one of claims 1 to 15.

17. The protective component and the heat management member are hermetically connected, and the housing according to claim 16.

18. The temperature reduction material installed on the protective component is installed in the area corresponding to the pressure relief mechanism of the protective component, and the housing according to claim 16 or 17.

19. The temperature reduction material is a phase change material, and the housing according to any one of claims 14 to 18.

20. The heat management member has a common wall between the electrical cavity and the collection cavity, and the housing according to any one of claims 1 to 19.

21. The heat management member is configured to be destroyed so that the fluid flows out when the pressure relief mechanism operates, and the housing according to any one of claims 1 to 20.

22. The heat management member is a first heat conduction plate attached to the plurality of battery cells, a second heat conduction plate disposed on the side of the first heat conduction plate that is separated from the battery cell, and a flow path formed so that the fluid flows between the first heat conduction plate and the second heat conduction plate, and the housing according to any one of claims 1 to 21.

23. The heat management member does not have the flow path installed in the pressure relief area, and the housing according to claim 22.

24. A battery, a plurality of battery cells, at least one of the plurality of battery cells includes a pressure relief mechanism, the pressure relief mechanism is used to operate to release the internal pressure when the internal pressure or temperature of the battery cell provided with the pressure relief mechanism reaches a threshold value, and a plurality of battery cells, and a housing according to any one of claims 1 to 23.

25. A power consumption device including the battery according to claim 24.

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