Battery, electrical device, method and device for preparing battery

Abstract

The embodiments of the present application provide a battery, an electrical device, a method and an apparatus for preparing a battery, wherein the battery comprises: a battery cell, including a pressure relief mechanism, the pressure relief mechanism being arranged on the first wall of the battery cell, the pressure relief mechanism being used to actuate to release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value; a thermal management component being used to contain a fluid to adjust the temperature of the battery cell, the first surface of the thermal management component being attached to the first wall, the thermal management component being provided with a pressure relief hole opposite to the pressure relief mechanism, so that when the pressure relief mechanism is actuated, the exhaust discharged from the battery cell can be discharged through the pressure relief hole through the thermal management component; a baffle being used to cover a portion of the pressure relief hole, so that when the pressure relief mechanism is actuated, the exhaust direction of the exhaust entering the pressure relief hole is changed. The battery, the electrical device, the method and the apparatus for preparing a battery provided by the embodiments of the present application can enhance the safety of the battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery, an electrical device, and a method and device for preparing a battery. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, in addition to improving battery performance, safety is also an issue that cannot be ignored. If the safety of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to enhance the safety of the battery is a technical problem that needs to be solved urgently in battery technology. Summary of the invention

[0004] The present application provides a battery, an electrical device, and a method and device for preparing a battery, which can enhance the safety of the battery.

[0005] In a first aspect, a battery is provided, comprising: a battery cell, comprising a pressure relief mechanism, the pressure relief mechanism being arranged on a first wall of the battery cell, the pressure relief mechanism being used to actuate to release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value; a thermal management component being used to contain a fluid to regulate the temperature of the battery cell, the first surface of the thermal management component being attached to the first wall, the thermal management component being provided with a pressure relief hole opposite to the pressure relief mechanism, so that when the pressure relief mechanism is actuated, emissions discharged from the battery cell can be discharged through the pressure relief hole through the thermal management component; and a baffle being used to cover a portion of the pressure relief hole so as to change the discharge direction of the emissions entering the pressure relief hole when the pressure relief mechanism is actuated.

[0006] Therefore, the battery in the embodiment of the present application, by providing a baffle on the thermal management component to block a portion of the pressure relief hole, when the pressure relief mechanism is actuated, after the emissions discharged from the battery cell enter the pressure relief hole, and before or after passing through the pressure relief hole, the emissions may directly contact the baffle and be reflected on the surface of the baffle, thereby changing the original emission direction of the emissions, so that more high-temperature emissions can contact the thermal management component to achieve a better cooling effect, and avoid as much as possible the situation where the high-temperature emissions flow too smoothly when passing through the pressure relief hole and cannot fully contact the thermal management component.

[0007] In some embodiments, a maximum distance between the baffle and the first wall is greater than a minimum distance from the upper surface to the first wall.

[0008] The thermal management component contains fluid, and the distance between the baffle and the wall with the pressure relief mechanism is farther than the thermal management component, so that the emissions passing through the pressure relief hole are reflected after contacting the baffle, so as to ensure that more emissions contact the thermal management component, thereby achieving a better cooling effect.

[0009] In some embodiments, the baffle is inclined relative to the axis of the pressure relief hole, and gradually approaches the axis of the pressure relief hole along the direction away from the first wall, so that the exhaust can impact the hole wall of the pressure relief hole when the pressure relief mechanism is actuated.

[0010] In some embodiments, the angle between the baffle and the axis of the pressure relief hole ranges from 20° to 40°.

[0011] If the angle is set too large, the baffle will block too large an area of ​​the pressure relief hole, blocking the pressure relief hole and affecting the passage of emissions discharged from the battery cell when the pressure relief mechanism is actuated, which may lead to poor exhaust and further cause the battery cell to explode. On the contrary, if the angle is set too small, it will also affect the reflection effect of the emissions on the baffle surface. Therefore, the angle is usually set in the range of 20° to 40° to achieve the best effect.

[0012] In some embodiments, the pressure relief hole is surrounded by two baffles that are oppositely arranged.

[0013] In some embodiments, the ratio of the area of ​​the pressure relief hole blocked by the baffle to the area of ​​the pressure relief hole is not less than 0.5 and not greater than 0.8, which will not hinder the discharge of emissions and allow the emissions to contact the thermal management component over a large area after being reflected on the baffle surface.

[0014] In some embodiments, the surface roughness of the baffle is less than or equal to 0.1 μm.

[0015] Considering that if the baffle surface is too rough, high-temperature particles in the exhaust may accumulate on the surface of the baffle and cannot rebound, thereby affecting the effect of the baffle, the surface of the baffle should usually be set to a relatively smooth surface.

[0016] In some embodiments, the baffle is disposed on a second surface of the thermal management component, the second surface is opposite to the first surface or the second surface is a hole wall of the pressure relief hole.

[0017] In some embodiments, the battery further includes: an electrical cavity for accommodating a plurality of the battery cells; and a collecting cavity for collecting emissions discharged from the battery cells and emissions from the thermal management component when the pressure relief mechanism is actuated; wherein the thermal management component is used to isolate the electrical cavity and the collecting cavity.

[0018] In some embodiments, the battery further includes: a protection member, the protection member is used to protect the thermal management component, and the protection member and the thermal management component form the collection cavity.

[0019] In some embodiments, the protective member includes a bottom wall and a plurality of side walls to form a hollow structure with an opening at one end, and the heat management component covers the opening to form the collection chamber.

[0020] In some embodiments, along the axis of the pressure relief hole, one end of the baffle away from the first wall abuts against the bottom wall of the protective component.

[0021] At least one battery cell is arranged on the surface of the thermal management component. By placing one end of the baffle against the bottom wall of the protective component, the thermal management component can be supported to ensure the distance between the thermal management component and the bottom wall of the protective component, thereby ensuring the space of the collection chamber, thereby avoiding explosion in the collection chamber.

[0022] In addition, in the case where two opposite baffles are set in each pressure relief hole, if the lower end of the baffle is pressed against the bottom wall of the protective component, the high-temperature exhaust can be discharged into two opposite channels under the action of the baffle after passing through the pressure relief hole. In particular, the high-temperature gas in the high-temperature exhaust can be concentrated and divided into two channels by the baffle after entering the collection chamber, further increasing the possibility of the high-temperature gas melting the lower surface of the thermal management component, so that the thermal management component can be destroyed on a large area, and the internal fluid can flow out in large quantities, thereby improving the cooling effect.

[0023] In some embodiments, the thermal management component is configured to be destroyed by the discharge after the discharge direction is changed when the pressure relief mechanism is actuated, so that the fluid is discharged from the interior of the thermal management component.

[0024] In some embodiments, a temperature-sensitive material is disposed on the thermal management component, and the temperature-sensitive material is configured to be melted by the exhaust when the pressure relief mechanism is actuated, so that the fluid is discharged from the interior of the thermal management component.

[0025] In some embodiments, the temperature sensitive material is disposed on a region of the thermal management component that faces the exhaust of the battery cell.

[0026] For example, the temperature-sensitive material can be set on the wall of the pressure relief hole, or can be set around the pressure relief hole on the first surface of the thermal management component, so that when the discharge in the battery cell passes through the pressure relief hole, the temperature-sensitive material can be melted, so that the fluid in the thermal management component can be discharged smoothly, thereby better cooling.

[0027] In a second aspect, an electrical device is provided, comprising: the battery in the first aspect, used for providing electrical energy.

[0028] In some embodiments, the electrical equipment is a vehicle, a ship or a spacecraft.

[0029] In a third aspect, a method for preparing a battery is provided, comprising: providing a battery cell, the battery cell comprising a pressure relief mechanism, the pressure relief mechanism being arranged on a first wall of the battery cell, the pressure relief mechanism being used to actuate to release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value; providing a thermal management component, the thermal management component being used to contain a fluid to regulate the temperature of the battery cell, the first surface of the thermal management component being attached to the first wall, the thermal management component being provided with a pressure relief hole opposite to the pressure relief mechanism, so that when the pressure relief mechanism is actuated, emissions discharged from the battery cell can be discharged through the pressure relief hole through the thermal management component; providing a baffle, the baffle being used to block a portion of the pressure relief hole, so that the discharge direction of the emissions entering the pressure relief hole is changed when the pressure relief mechanism is actuated.

[0030] In a fourth aspect, a device for preparing a battery is provided, comprising a module for executing the method of the third aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a structural schematic diagram of a vehicle disclosed in an embodiment of the present application;

[0032] Figure 2 is a schematic diagram of the structure of a battery disclosed in one embodiment of the present application;

[0033] Figure 3 is a structural schematic diagram of a battery module disclosed in an embodiment of the present application;

[0034] Figure 4 An exploded view of a battery cell disclosed in one embodiment of the present application;

[0035] Figure 5 is an exploded diagram of a battery cell and a thermal management component disclosed in one embodiment of the present application;

[0036] Figure 6 is an exploded view of a thermal management component and a baffle disclosed in an embodiment of the present application;

[0037] Figure 7 is a top view of a thermal management component provided with a baffle disclosed in one embodiment of the present application;

[0038] Figure 8 is a bottom view of a thermal management component provided with a baffle disclosed in one embodiment of the present application;

[0039] Fig. 9is a cross-sectional view of a battery cell, a thermal management component and a baffle disclosed in an embodiment of the present application;

[0040] Fig.10 is a cross-sectional view of another battery cell, a thermal management component and a baffle disclosed in an embodiment of the present application;

[0041] Fig.11 is a schematic diagram of the structure of a battery disclosed in one embodiment of the present application;

[0042] Fig.12 is an exploded view of an electrical cavity disclosed in an embodiment of the present application;

[0043] Fig.13 is an exploded view of another electrical cavity disclosed in an embodiment of the present application;

[0044] Fig.14 It is a schematic diagram of a box structure of a battery disclosed in an embodiment of the present application;

[0045] Fig.15 It is a schematic diagram of the box structure of another battery disclosed in an embodiment of the present application;

[0046] Fig.16 is an exploded diagram of a battery disclosed in one embodiment of the present application;

[0047] Fig.17 is a cross-sectional view of a thermal management component, a baffle, and a protective member disclosed in an embodiment of the present application;

[0048] Fig.18 is a schematic flow chart of a method for preparing a battery disclosed in an embodiment of the present application;

[0049] Fig.19 is a schematic block diagram of a device for preparing a battery disclosed in an embodiment of the present application;

[0050] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0051] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0052] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two (including two); the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0053] The directional words appearing in the following description are all 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 also be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect" and "attach" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0054] In the present application, battery cells may include primary batteries and secondary batteries, such as lithium-ion batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application.

[0055] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. A battery pack generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0056] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer. The current collector not coated with the negative electrode active material layer serves 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. In order to ensure that a large current can pass without melting, the number of positive pole ears is multiple and stacked together, and the number of negative pole ears is multiple and stacked together. The material of the diaphragm can be PP or PE, etc. In addition, the electrode assembly can be a winding structure or a laminated structure, and the embodiments of the present application are not limited to this. The development of battery technology must consider many design factors at the same time, such as performance parameters such as energy density, cycle life, discharge capacity, and charge and discharge rate. In addition, the safety of the battery also needs to be considered.

[0057] For batteries, the main safety hazards come from the charging and discharging process. In order to improve the safety performance of the battery, a pressure relief mechanism is generally provided for the battery cell. The pressure relief mechanism refers to an element or component that is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. The predetermined threshold can be adjusted according to different design requirements. The predetermined threshold may depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte and isolation membrane in the battery cell. The pressure relief mechanism can adopt, for example, pressure-sensitive or temperature-sensitive elements or components, that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism is actuated to form a channel for the internal pressure or temperature to be released.

[0058] The "activation" mentioned in this application refers to the action of the pressure relief mechanism, so that the internal pressure and temperature of the battery cell can be released. The action of the pressure relief mechanism may include but is not limited to: at least a part of the pressure relief mechanism is broken, torn or melted, etc. After the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged from the pressure relief mechanism as emissions. In this way, the battery cell can be depressurized under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0059] The emissions from the battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the isolation membrane, high-temperature and high-pressure gas generated by the reaction, flames, etc.

[0060] The pressure relief mechanism on the battery cell has an important impact on the safety of the battery. For example, when a short circuit or overcharge occurs in a battery cell, thermal runaway may occur inside the battery cell, causing a sudden increase in pressure or temperature. In this case, the pressure relief mechanism can be activated to release the internal pressure and temperature to prevent the battery cell from exploding or catching fire.

[0061] In the current design of the pressure relief mechanism, the main focus is on releasing the high pressure and high heat inside the battery cell, that is, discharging the emissions to the outside of the battery cell. However, in order to ensure the output voltage or current of the battery, multiple battery cells are often required and the multiple battery cells are electrically connected through a busbar. The emissions discharged from the inside of the battery cell may cause the remaining battery cells to short-circuit. For example, when the discharged metal chips are electrically connected to the two busbars, it will cause the battery to short-circuit, thus posing a safety hazard. In addition, the high-temperature and high-pressure emissions are discharged in the direction of the pressure relief mechanism set in the battery cell, and can be more specifically discharged in the direction toward the area where the pressure relief mechanism is actuated. The power and destructive force of such emissions may be great, and may even be sufficient to break through one or more structures in that direction, causing further safety problems.

[0062] In view of this, an embodiment of the present application provides a thermal management component in the battery, the surface of the thermal management component is attached to the surface of the battery cell provided with a pressure relief mechanism, and a pressure relief area may also be provided on the thermal management component, for example, the pressure relief area may be a pressure relief hole.

[0063] On the one hand, the thermal management component is used to contain a fluid to adjust the temperature of multiple battery cells. The fluid here can be a liquid or a gas, and adjusting the temperature refers to heating or cooling multiple battery cells. In the case of cooling or lowering the temperature of the battery cells, the thermal management component is used to contain a cooling fluid to lower the temperature of multiple battery cells. At this time, the thermal management component can also be called a cooling component, a cooling system or a cooling plate, etc., and the fluid contained therein can also be called a cooling medium or a cooling fluid, more specifically, a coolant or a cooling gas. In addition, the thermal management component can also be used for heating to increase the temperature of multiple battery cells, which is not limited in the embodiments of the present application. Optionally, the fluid can be circulating to achieve a better temperature regulation effect. Optionally, the fluid can be water, a mixture of water and ethylene glycol, or air, etc.

[0064] On the other hand, when the pressure relief mechanism is actuated, the exhaust discharged from the battery cell can be discharged through the pressure relief hole of the thermal management component, and the thermal management component can also cool the battery cell to avoid explosion of the battery cell.

[0065] The busbar is used to realize electrical connection between multiple battery cells, such as parallel connection, series connection or mixed connection. The busbar can realize electrical connection between battery cells by connecting the electrode terminals of the battery cells. In some embodiments, the busbar can be fixed to the electrode terminals of the battery cells by welding. Corresponding to the "high-voltage cavity", the electrical connection formed by the busbar can also be called "high-voltage connection".

[0066] The technical solutions described in the embodiments of the present application are applicable to various devices that use batteries, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0067] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0068] For example, Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery 10 may be arranged inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 40. For example, a battery 10 may be arranged at the bottom, front or 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 an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0069] In order to meet different power requirements, the battery may include multiple battery cells, wherein the multiple battery cells may be connected in series, in parallel, or in a hybrid connection, wherein the hybrid connection refers to a mixture of series and parallel connections. The battery may also be referred to as a battery pack. Optionally, multiple battery cells may be connected in series, in parallel, or in a hybrid connection to form a battery module, and multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form a battery. In other words, multiple battery cells may be directly connected to form a battery, or may be first connected to form a battery module, and then the battery module may be connected to form a battery.

[0070] For example, Figure 2 As shown in FIG. 1 , it is a schematic diagram of the structure of a battery 10 according to an embodiment of the present application. The battery 10 may include at least one battery module 200. The battery module 200 includes a plurality of battery cells 20. The battery 10 may also include a box body, the interior of the box body is a hollow structure, and the plurality of battery cells 20 are accommodated in the box body. Figure 2 As shown, the box body may include two parts, which are respectively referred to as a first part 111 and a second part 112, and the first part 111 and the second part 112 are buckled together. The shapes of the first part 111 and the second part 112 may be determined according to the shape of the battery module 200 combination, and at least one of the first part 111 and the second part 112 has an opening. For example, Figure 2 As shown, the first part 111 and the second part 112 can both be hollow cuboids and each have only one open face, 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 buckled together to form a box with a closed chamber. Figure 2 As shown, only one of the first part 111 and the second part 112 may be a hollow cuboid with an opening, and the other may be a plate-shaped to cover the opening. For example, here, the second part 112 is a hollow cuboid with only one face as an opening face, and the first part 111 is a plate-shaped example, then the first part 111 covers the opening of the second part 112 to form a box with a closed chamber, which can be used to accommodate multiple battery cells 20. Multiple battery cells 20 are connected in parallel, in series, or in a mixed combination and placed in the box formed by the first part 111 and the second part 112 being buckled together.

[0071] Optionally, the battery 10 may also include other structures, which are not described one by one here. For example, the battery 10 may also include a busbar component, which is used to realize the electrical connection between multiple battery cells 20, such as parallel connection, series connection or mixed connection. Specifically, the busbar component can realize the electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of multiple battery cells 20 can be further led out through the box through the conductive mechanism.

[0072] According to different power requirements, the number of battery cells 20 in the battery module 200 can be set to any value. Multiple battery cells 20 can be connected in series, parallel or mixed to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, in order to facilitate installation, the battery cells 20 are grouped and each group of battery cells 20 constitutes a battery module 200. The number of battery cells 20 included in the battery module 200 is not limited and can be set according to requirements. For example, Figure 3is an example of a battery module 200. The battery may include a plurality of battery modules 200, and the battery modules 200 may be connected in series, in parallel, or in a mixed manner.

[0073] Figure 4 This is a schematic diagram of the structure of a battery cell 20 according to an embodiment of the present application. The battery cell 20 includes one or more electrode assemblies 22, a shell 211 and a cover plate 212. The shell 211 and the cover plate 212 form a shell 21. The wall of the shell 211 and the cover plate 212 are both called the wall of the battery cell 20. The shell 211 is determined according to the shape of the one or more electrode assemblies 22 after being combined. For example, the shell 211 can be a hollow cuboid or a cube or a cylinder, and one of the faces of the shell 211 has an opening so that one or more electrode assemblies 22 can be placed in the shell 211. For example, when the shell 211 is a hollow cuboid or a cube, one of the planes of the shell 211 is an open surface, that is, the plane does not have a wall body so that the inside and outside of the shell 211 are connected. When the shell 211 can be a hollow cylinder, the end face of the shell 211 is an open face, that is, the end face does not have a wall body so that the inside and outside of the shell 211 are connected. The cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The housing 211 is filled with electrolyte, such as electrolyte solution.

[0074] The battery cell 20 may also include two electrode terminals 214, which may be disposed on the cover plate 212. The cover plate 212 is generally in the shape of a flat plate, and the two electrode terminals 214 are fixed on the flat surface of the cover plate 212, and the two electrode terminals 214 are respectively a first electrode terminal 214a and a second electrode terminal 214b. The polarities of the two electrode terminals 214 are opposite. For example, when the first electrode terminal 214a is a positive electrode terminal, the second electrode terminal 214b is a negative electrode terminal. Each electrode terminal 214 is provided with a corresponding connecting member 23, which is located between the cover plate 212 and the electrode assembly 22, and is used to electrically connect the electrode assembly 22 and the electrode terminal 214.

[0075] like Figure 4 As shown, each electrode assembly 22 has a first pole tab 221a and a second pole tab 222a. The polarities of the first pole tab 221a and the second pole tab 222a are opposite. For example, when the first pole tab 221a is a positive pole tab, the second pole tab 222a is a negative pole tab. The first pole tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal through a connecting member 23, and the second pole tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal through another connecting member 23. For example, the positive electrode terminal 214a is connected to the positive pole tab through a connecting member 23, and the negative electrode terminal 214b is connected to the negative pole tab through another connecting member 23.

[0076] In the battery cell 20, the electrode assembly 22 can be provided as a single electrode assembly or multiple electrode assemblies according to actual use requirements. Figure 4 As shown, four independent electrode assemblies 22 are disposed in the battery cell 20 .

[0077] like Figure 4 As shown, a pressure relief mechanism 213 may be further provided on a wall of the battery cell 20 , for example, the pressure relief mechanism 213 may be provided on the first wall 21 a of the battery cell 20 . Figure 4 The first wall 21a in the battery cell 20 is separated from the housing 211, that is, the bottom side of the housing 211 has an opening, and the first wall 21a covers the bottom side opening and is connected to the housing 211, and the connection method can be welding or gluing. Alternatively, the first wall 21a and the housing 211 can also be an integrated structure. The pressure relief mechanism 213 is used to actuate to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold.

[0078] The pressure relief mechanism 213 may be a part of the first wall 21a, or may be a separate structure from the first wall 21a, and may be fixed to the first wall 21a by, for example, welding. When the pressure relief mechanism 213 is a part of the first wall 21a, for example, the pressure relief mechanism 213 may be formed by providing a notch on the first wall 21a, and the thickness of the first wall 21a corresponding to the notch is less than the thickness of the pressure relief mechanism 213 in other areas except the notch. The notch is the weakest position of the pressure relief mechanism 213. When the battery cell 20 generates too much gas, causing the internal pressure of the shell 211 to rise and reach a threshold, or the internal reaction of the battery cell 20 generates heat, causing the internal temperature of the battery cell 20 to rise and reach a threshold, the pressure relief mechanism 213 may rupture at the notch, causing the shell 211 to communicate with the inside and outside, and the gas pressure and temperature are released outward through the rupture of the pressure relief mechanism 213, thereby preventing the battery cell 20 from exploding.

[0079] Optionally, in one embodiment of the present application, Figure 4 As shown, in the case where the pressure relief mechanism 213 is disposed on the first wall 21 a of the battery cell 20 , the second wall of the battery cell 20 is provided with the electrode terminal 214 , and the second wall is different from the first wall 21 a .

[0080] Optionally, the second wall is disposed opposite to the first wall 21 a. For example, the first wall 21 a may be a bottom wall of the battery cell 20, and the second wall may be a cover plate 212 of the battery cell 20.

[0081] By arranging the pressure relief mechanism 213 and the electrode terminal 214 on different walls of the battery cell 20, when the pressure relief mechanism 213 is actuated, the discharge of the battery cell 20 can be further away from the electrode terminal 214, thereby reducing the impact of the discharge on the electrode terminal 214 and the busbar component, thereby enhancing the safety of the battery.

[0082] Furthermore, when the electrode terminal 214 is disposed on the cover plate 212 of the battery cell 20, the pressure relief mechanism 213 is disposed on the bottom wall of the battery cell 20, so that when the pressure relief mechanism 213 is actuated, the discharge of the battery cell 20 is discharged to the bottom of the battery 10. In this way, on the one hand, the danger of the discharge can be reduced by using the thermal management component at the bottom of the battery 10, and on the other hand, when the battery 10 is disposed in a vehicle, the bottom of the battery 10 is usually away from the passengers, thereby reducing the harm to the passengers.

[0083] The pressure relief mechanism 213 may be any possible pressure relief structure, which is not limited in the embodiments of the present application. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and / or, the pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0084] In order to adjust the temperature of the battery cell 20, a thermal management component can be provided under the battery cell 20. Specifically, the thermal management component can be used to contain a fluid to adjust the temperature of the battery cell 20, and when the pressure relief mechanism 213 is actuated, the thermal management component can cool down the exhaust from the battery cell 20 provided with the pressure relief mechanism 213.

[0085] Optionally, a pressure relief area may also be provided on the thermal management component. For example, the pressure relief area may be a pressure relief hole. Thus, when the pressure relief mechanism 213 is actuated, the pressure relief mechanism 213 opens to discharge the emissions in the battery cell 20. The emissions may also be discharged through the pressure relief hole through the thermal management component.

[0086] However, when the pressure relief mechanism 213 is actuated, the discharged exhaust is discharged through the pressure relief hole of the thermal management component at a too fast speed, which causes the fluid contained in the thermal management component to be unable to effectively cool the exhaust. Therefore, how to effectively discharge the exhaust and cool it down quickly is a problem that is difficult to solve in the current design of the battery cell 20.

[0087] Therefore, an embodiment of the present application provides a battery that can solve the above problems.

[0088] Figure 5 A partial exploded view of the battery 10 in the embodiment of the present application is shown. Figure 5 As shown, the battery 10 includes: at least one battery cell 20, and the battery cell 20 hereinafter is taken as an example of any battery cell 20 included in the battery 10, that is, the battery cell 20 can be Figure 1-4 The battery cell 20 is suitable for the above Figure 1-4For the sake of brevity, the relevant description of the battery cell 20 is not repeated here. Specifically, the battery cell 20 includes a pressure relief mechanism 213, which is arranged on the first wall 21a of the battery cell 20, and is used to actuate to release the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0089] like Figure 5 As shown, the battery 10 further includes: a thermal management component 13, which is used to contain a fluid to adjust the temperature of the battery cell 20. The thermal management component 13 is applicable to the relevant description of the thermal management component above, and for the sake of brevity, it is not repeated here. Specifically, the first surface 1321 of the thermal management component 13 is attached to the first wall 21a of the battery cell 20, and the thermal management component 13 is provided with a pressure relief hole 131 opposite to the pressure relief mechanism 213, so that when the pressure relief mechanism 213 is actuated, the exhaust discharged from the battery cell 20 can be discharged through the pressure relief hole 131 through the thermal management component 13.

[0090] In the embodiments of the present application, Figure 5 As shown, the battery 10 further includes a baffle 14, which is used to cover a portion of the pressure relief hole 131 so as to change the discharge direction of the exhaust entering the pressure relief hole 131 when the pressure relief mechanism 213 is actuated.

[0091] Therefore, the battery 10 of the embodiment of the present application is provided with a baffle 14 on the thermal management component 13, so that the baffle 14 blocks a part of the pressure relief hole 131. In this way, when the pressure relief mechanism 213 is actuated, after the emissions discharged from the battery cell 20 enter the pressure relief hole 131, and before or after passing through the pressure relief hole 131, the emissions may directly contact the baffle 14 and be reflected on the surface of the baffle 14, thereby changing the original emission direction of the emissions, so that more high-temperature emissions impact the thermal management component 13, so that the thermal management component 13 can cool down more emissions; in addition, more high-temperature emissions may also widen the area of ​​the high-temperature emissions melting the thermal management component 13, and the thermal management component 13 may be more fully destroyed by the high-temperature emissions, which ensures that enough fluid in the thermal management component 13 can flow out smoothly to achieve a better cooling effect, and avoids as much as possible the situation where the high-temperature emissions directly pass through the pressure relief hole 131 and may not impact or melt the thermal management component 13.

[0092] It should be understood that the thermal management component 13 of the embodiment of the present application is used to accommodate fluid to adjust the temperature of multiple battery cells 20. In the case of cooling the battery cells 20, the thermal management component 13 can accommodate a cooling medium to adjust the temperature of multiple battery cells 20. At this time, the thermal management component 13 can also be called a cooling component, a cooling system or a cooling plate. In addition, the thermal management component 13 can also be used for heating, which is not limited in the embodiment of the present application. Optionally, the fluid can be circulated to achieve a better temperature regulation effect.

[0093] Figure 6 This is an exploded view of the thermal management component 13 of the embodiment of the present application. Figure 7 1 is a top view of the thermal management component 13 of the embodiment of the present application. Figure 8 FIG. 1 is a bottom view of the thermal management component 13 of the embodiment of the present application. Figures 6 to 8 As shown, the thermal management component 13 of the embodiment of the present application may be provided with a flow channel 134, which is used to accommodate fluid, so that when the pressure relief mechanism 213 is actuated, the exhaust discharged from the battery cell 20 through the pressure relief mechanism 213 can destroy the flow channel 134, so that the fluid in the flow channel 134 is discharged, thereby cooling the exhaust.

[0094] Specifically, Figures 6 to 8 As shown, the thermal management component 13 may include a first thermal conductive plate 132 and a second thermal conductive plate 133, the first thermal conductive plate 132 is disposed between the second thermal conductive plate 133 and the first wall 21a of the battery cell 20, and the first thermal conductive plate 132 is attached to the first wall 21a, and the first thermal conductive plate 132 and the second thermal conductive plate 133 are connected. The upper surface of the first thermal conductive plate 132 is the first surface 1321 of the thermal management component 13, and the first surface 1321 is attached to the first wall 21a of the battery cell 20.

[0095] It should be understood that in the embodiment of the present application, the first surface 1321 is attached to the first wall 21a of the battery cell 20 by the first surface 1321 directly contacting the first wall 21a, or by the first surface 1321 contacting the first wall 21a through thermal conductive glue or other substances to achieve heat exchange between the first surface 1321 and the first wall 21a of the battery cell 20.

[0096] For the pressure relief hole 131 provided on the heat management component 13, as shown in FIG. Figures 6 to 8 As shown, through holes with corresponding positions can be respectively provided on the first heat conducting plate 132 and the second heat conducting plate 133 to form a pressure relief hole 131, that is, the pressure relief hole 131 passes through the first heat conducting plate 132 and the second heat conducting plate 133 respectively.

[0097] Alternatively, if Figure 6As shown, the first heat conducting plate 132 may further include a second groove 1322 opening away from the second heat conducting plate 133 , and a through hole is provided on the bottom wall of the second groove 1322 to form a pressure relief hole 131 on the first heat conducting plate 132 . Among them, the aperture of the second groove 1322 can gradually increase in the direction away from the second heat conducting plate 133, that is, the hole wall of the second groove 1322 is inclined relative to the axis of the pressure relief hole 131, so that when the battery cell 20 is thermally runaway, the emissions discharged through the pressure relief mechanism 213 can contact more side walls of the second groove 1322, so that more emissions can be cooled by the thermal management component 13. For example, the side walls of the second groove 1322 can be set as the walls of the flow channel 134, then when the emissions contact the side walls of the second groove 1322, the liquid in the flow channel 134 can cool the emissions. Furthermore, the emissions can also melt the side walls of the second groove 1322, so that the fluid in the flow channel 134 flows out and cools the emissions.

[0098] The flow channel 134 provided on the heat management component 13 can be realized by providing a groove on the second heat conducting plate 133 or the first heat conducting plate 132. Specifically, taking the groove provided on the second heat conducting plate 133 as an example, Figures 6 to 8 As shown, the second heat conducting plate 133 is provided with a first groove 1331 opening toward the first heat conducting plate 132 . When the first heat conducting plate 132 and the second heat conducting plate 133 are arranged in close proximity, the first heat conducting plate 132 covers the opening of the first groove 1331 , thereby forming a hollow structure, which is the flow channel 134 .

[0099] Optionally, the shape, size and position of the flow channel 134 in the embodiment of the present application can be flexibly set according to actual applications. For example, Figure 6 and Figure 8 The flow channels 134 in the embodiment are all configured in strip shape, but Figure 6 and Figure 8 The sizes of the flow channels 134 at different positions may be different, but the embodiments of the present application are not limited thereto.

[0100] Taking into account that the emissions passing through the pressure relief mechanism 213 are discharged through the pressure relief hole 131 on the thermal management component 13, in order to enable the fluid in the thermal management component 13 to better cool down the emissions, or further, in order to enable the thermal management component 13 to be destroyed by the emissions so that the internal fluid can be discharged smoothly, the flow channel 134 on the thermal management component 13 is usually arranged around the pressure relief hole 131, so that the emissions passing through the pressure relief hole 131 can directly contact the flow channel 134 to be cooled by the fluid in the flow channel 134. Furthermore, the flow channel 134 can be damaged over a large area when the emissions contact the flow channel 134, so that more fluid in the flow channel 134 can be discharged smoothly.

[0101] In addition, in order to make the thermal management component 13 easy to be destroyed, a temperature-sensitive material can also be provided on the thermal management component 13. When the pressure relief mechanism 213 is actuated, the temperature-sensitive material can be melted by the discharge of the battery cell 20 to discharge the internal fluid from the interior of the thermal management component 13.

[0102] Optionally, the temperature-sensitive material may be disposed on the area of ​​the thermal management component 13 facing the discharge of the battery cell 20. For example, the temperature-sensitive material may be disposed around the pressure relief hole 131 on the first surface 1321 of the thermal management component 13. For another example, the temperature-sensitive material may also be disposed on the hole wall of the pressure relief hole 131. Moreover, the area where the temperature-sensitive material is disposed may be the wall of the flow channel 134, so that the discharge discharged from the battery cell 20 directly contacts the temperature-sensitive material and melts the temperature-sensitive material, so that the thermal management component 13 is destroyed. For example, the flow channel 134 of the thermal management component 13 is destroyed, and the internal fluid flows out to cool the discharge.

[0103] In order to enable the discharge of the battery cell 20 to contact or destroy the flow channel over as large an area as possible when the pressure relief mechanism 213 is actuated, the battery 10 of the embodiment of the present application further includes a baffle 14 to change the discharge direction of the discharge entering the pressure relief hole 131 .

[0104] Specifically, Figures 6 to 8 As shown, the baffle 14 can be set at any position around the pressure relief hole 131, so that the baffle 14 blocks a part of the pressure relief hole 131. For example, the ratio of the area of ​​the pressure relief hole 131 blocked by the baffle 14 to the total area of ​​the pressure relief hole 131 is generally in the range of 0.5 to 0.8, but the embodiment of the present application is not limited thereto. Figure 7 Taking the baffle 14 as an example, the width D1 of the baffle 14 may be equal to, smaller than, or larger than the width D2 of the pressure relief hole 131 .

[0105] In addition, the number and position of the baffles 14 in the embodiment of the present application can be flexibly set according to practical applications. For example, Figures 6 to 8 It is taken as an example that two baffles 14 are provided corresponding to each pressure relief hole 131 , but more or fewer baffles may also be provided, and the embodiments of the present application are not limited thereto.

[0106] The following will describe the arrangement of the baffle 14 by way of example with reference to the accompanying drawings.

[0107] Fig. 9 A battery cell 20 and a thermal management component 13 are shown. Figure 7 The cross-sectional view along the AA' direction is shown in FIG. Fig. 9 For example, only one baffle 14 is provided in each pressure relief hole 131; Fig.10Another battery cell 20 and a thermal management component 13 are shown along Figure 7 The cross-sectional view along the AA' direction is shown in FIG. Fig.10 For example, two baffles 14 are provided for each pressure relief hole 131. Fig. 9 and Fig.10 As shown, the baffle 14 in the embodiment of the present application can be located on the second surface of the thermal management component 13, and the second surface can be any surface of the thermal management component 13, that is, the baffle 14 can be arranged in the pressure relief hole 131 or can also be located outside the pressure relief hole 131. For example, Fig. 9 The baffle 14 is disposed in the pressure relief hole 131, and the baffle 14 is connected to the first heat conducting plate 132 of the heat management component 13, that is, the baffle 14 is disposed on the hole wall of the pressure relief hole 131; and Fig.10 The baffle 14 is disposed outside the pressure relief hole 131 , and the baffle 14 is connected to the second heat conducting plate 133 of the heat management component 13 , but the embodiments of the present application are not limited thereto.

[0108] In some embodiments, the maximum distance between the baffle 14 and the first wall 21a of the battery cell 20 is greater than the minimum distance from the flow channel 134 to the first wall 21a, so that the emissions can be reflected on the surface of the baffle 14 and change their emission direction, so that the reflected emissions can be directed toward the thermal management component 13, so that more emissions can contact the thermal management component 13, so as to achieve the effect of the thermal management component 13 cooling more emissions; further, the emission direction of the emissions is changed by the baffle 14, so that more emissions can impact the thermal management component 13, which may cause the flow channel 134 on the thermal management component 13 to be damaged, thereby causing the fluid inside the flow channel 134 to flow out and cool the emissions.

[0109] Specifically, the baffle 14 of the embodiment of the present application is usually arranged obliquely relative to the axis 1311 of the pressure relief hole 131. Figures 9 and 10 As shown, the baffle 14 is inclined relative to the axis 1311 of the pressure relief hole 131, and in the direction away from the first wall 21a, the baffle 14 gradually approaches the axis 1311 of the pressure relief hole 131, so that when the pressure relief mechanism 213 is actuated, the exhaust can be reflected by the baffle 14 and impact toward the hole wall of the pressure relief hole 131, so that more exhaust impacts the thermal management component 13, and then the exhaust can be more fully in contact with the thermal management component 13, which is more conducive to cooling.

[0110] Optionally, when the baffle 14 of the embodiment of the present application is tilted relative to the axis 1311 of the pressure relief hole 131, the angle θ between the baffle 14 and the axis 1311 of the pressure relief hole 131 can be set according to the actual application. However, if the angle θ is set too large, the baffle 14 will block too large an area of ​​the pressure relief hole 131, which will block the pressure relief hole 131 and affect the passage of the exhaust discharged by the battery cell 20 when the pressure relief mechanism 213 is actuated, which may lead to poor exhaust and further cause the battery cell 20 to explode; on the contrary, if the angle θ is set too small, it will also affect the reflection effect of the exhaust on the surface of the baffle 14. Therefore, the value range of the angle θ is usually set to 20° to 40° to achieve the best effect.

[0111] The material of the baffle 14 in the embodiment of the present application can be flexibly set according to the actual application. For example, the baffle 14 can be made of the same material as the thermal management component 13, for example, both can be set to aluminum alloy material, and the baffle 14 and the thermal management component 13 are fixed by welding.

[0112] In addition, the surface of the baffle 14 in the embodiment of the present application should be set to a relatively smooth surface. If it is too rough, the high-temperature particles in the exhaust may accumulate on the surface of the baffle 14 and cannot rebound, thereby affecting the effect of the baffle 14. For example, the surface roughness of the baffle 14 can be set to be less than or equal to 0.1 μm, and the surface roughness can be the arithmetic mean deviation (Ra) of the profile, but the embodiment of the present application is not limited thereto.

[0113] Optionally, the battery 10 of the embodiment of the present application may further include an electrical chamber 11a and a collecting chamber 11b. The battery 10 provided with the electrical chamber 11a, the collecting chamber 11b and the thermal management component 13 will be described in detail below in conjunction with the accompanying drawings.

[0114] Fig.11 FIG. 1 is a schematic diagram of a box 11 of a battery 10 according to an embodiment of the present application. Fig.11 As shown, the housing 11 of the embodiment of the present application may include an electrical chamber 11a, a collecting chamber 11b and a heat management component 13. The heat management component 13 is used to isolate the electrical chamber 11a and the collecting chamber 11b. The so-called "isolation" here means separation, which may not be sealed.

[0115] The electrical cavity 11a is used to accommodate the plurality of battery cells 20 and the busbar 12. The electrical cavity 11a provides a space for accommodating the battery cells 20 and the busbar 12, and the shape of the electrical cavity 11a may be determined according to the plurality of battery cells 20 and the busbar 12.

[0116] The busbar 12 is used to realize electrical connection of a plurality of battery cells 20. The busbar 12 can realize electrical connection between the battery cells 20 by connecting the electrode terminals 214 of the battery cells 20.

[0117] At least one battery cell 20 among the plurality of battery cells 20 may include a pressure relief mechanism 213 for actuating to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0118] For ease of description, the battery cell 20 involved in the following description of the pressure relief mechanism 213 refers to the battery cell 20 provided with the pressure relief mechanism 213. For example, the battery cell 20 may be Figure 4 The battery cell 20 in the embodiment.

[0119] The collecting chamber 11 b is used to collect the exhaust from the battery cell 20 provided with the pressure relief mechanism 213 when the pressure relief mechanism 213 is actuated.

[0120] In the embodiment of the present application, the heat management component 13 is used to isolate the electrical chamber 11a and the collection chamber 11b. That is, the electrical chamber 11a that accommodates multiple battery cells 20 and the confluence component 12 is separated from the collection chamber 11b that collects the emissions. In this way, when the pressure relief mechanism 213 is actuated, the emissions of the battery cells 20 enter the collection chamber 11b, but will not enter or enter a small amount of the electrical chamber 11a, so that the electrical connection in the electrical chamber 11a will not be affected, thereby enhancing the safety of the battery.

[0121] Optionally, in one embodiment of the present application, the heat management component 13 has a wall shared by the electrical cavity 11a and the collecting cavity 11b. Fig.11 As shown, the thermal management component 13 can be a wall of the electrical cavity 11a and a wall of the collecting cavity 11b at the same time. In other words, the thermal management component 13 (or a part thereof) can directly serve as a wall shared by the electrical cavity 11a and the collecting cavity 11b, so that the emissions of the battery cells 20 can enter the collecting cavity 11b through the thermal management component 13. At the same time, due to the presence of the thermal management component 13, the emissions can be isolated from the electrical cavity 11a as much as possible, thereby reducing the danger of the emissions and enhancing the safety of the battery.

[0122] Optionally, in one embodiment of the present application, the electrical cavity 11a may be formed by a cover body with an opening and a heat management component 13. For example, Fig.12 An exploded view of the electrical cavity 11a of the embodiment of the present application is shown. Fig.12 As shown, the box body 11 may include a cover body 110 having an opening (eg Fig.12 The cover body 110 with an opening is a semi-enclosed chamber, and has an opening communicating with the outside. The heat management component 13 covers the opening to form a chamber, namely, the electrical chamber 11a.

[0123] Optionally, the cover body 110 may also be composed of multiple parts, for example, Fig.13 Another exploded view of the electrical cavity 11a of the embodiment of the present application is shown, and the housing 110 may include a first portion 111 and a second portion 112. The second portion 112 has openings on both sides, that is, the second portion 112 has only walls around it, the first portion 111 covers one opening of the second portion 112, and the thermal management component 13 covers the other opening of the second portion 112, thereby forming the electrical cavity 11a.

[0124] Fig.13 An example of this can be found in Figure 2 Specifically, Figure 2 The bottom wall of the second part 112 in the embodiment is replaced by the heat management component 13, and the heat management component 13 is used as a wall of the electrical cavity 11a, thereby forming Fig.13 In other words, the electrical cavity 11a in Figure 2 The bottom wall of the second part 112 is removed, that is, a ring wall with openings on both sides is formed, and the first part 111 and the heat management component 13 respectively cover the openings on both sides of the second part 112 to form a chamber, that is, the electrical chamber 11a.

[0125] Optionally, in one embodiment of the present application, the collection chamber 11b may be formed by a heat management component 13 and a protective member. Fig.14 A schematic diagram of a box 11 according to an embodiment of the present application is shown, wherein: Fig.14 The electrical cavity 11b in the Fig.12 The electrical cavity 11b shown; Fig.15 Another schematic diagram of the box 11 of the embodiment of the present application is shown, wherein: Fig.15 The electrical cavity 11b in the Fig.13 The electrical cavity 11b shown. Fig.14 and Fig.15 As shown, the housing 11 further includes a protection member 115. The protection member 115 is used to protect the heat management component 13, and the protection member 115 and the heat management component 13 form a collection chamber 11b.

[0126] The collecting chamber 11b formed by the protective member 115 and the thermal management component 13 does not occupy the space that can accommodate the battery cells, so a larger collecting chamber 11b can be provided, thereby effectively collecting and buffering the emissions and reducing their danger.

[0127] Optionally, in one embodiment of the present application, a fluid, such as a cooling medium, may be provided in the collecting chamber 11b, or a component for containing the fluid may be provided to further cool the exhaust entering the collecting chamber 11b.

[0128] Optionally, in one embodiment of the present application, the collecting chamber 11b may be a sealed chamber. For example, the connection between the protective member 115 and the heat management component 13 may be sealed by a sealing member.

[0129] Optionally, in one embodiment of the present application, the collecting chamber 11 b may not be a sealed chamber. For example, the collecting chamber 11 b may be in communication with the outside air, so that a portion of the exhaust may be further discharged to the outside of the box body 11 .

[0130] In the above embodiment, the heat management component 13 covers the opening of the cover body 110 to form the electrical chamber 11a, and the heat management component 13 and the protective member 115 form the collection chamber 11b. Optionally, the heat management component 13 can also directly separate the closed box 11 into the electrical chamber 11a and the collection chamber 11b without providing an additional protective member 115.

[0131] For example, in one embodiment of the present application, Fig.13 For example, the cover body 110 may include a first portion 111 and a second portion 112, wherein the first portion 111 and the second portion 112 are both hollow structures with an opening on one side, and can form a semi-enclosed structure respectively. The thermal management component 13 can be arranged inside the second portion 112, and the first portion 111 covers the opening of the second portion 112. In other words, the thermal management component 13 can be first arranged in the semi-enclosed second portion 112 to isolate the collection chamber 11b, and then the first portion 111 covers the opening of the second portion 112 to form the electrical chamber 11a. In this way, by comparison Fig.15 It can be known that the protection member 115 can be replaced by the bottom wall of the second portion 112 to form the collecting chamber 11 b.

[0132] For the sake of convenience, the following description will take the case where the collecting chamber 11 b is formed by the protective member 115 as an example.

[0133] Optionally, when using Fig.10 When the baffle 14 is arranged in the manner shown, one end of the baffle 14 away from the heat management component 13 can abut against the protective member 115 .

[0134] Fig.16 An exploded view of a battery 10 having a protective member 115 according to an embodiment of the present application is shown. Fig.17 FIG. 1 shows a cross-sectional view of the protective member 115 and the thermal management component 13. Fig.16 and Fig.17 As shown, the protective member 115 and the heat management component 13 form a collection chamber 11b. The protective member 115 includes a bottom wall 1511 and a plurality of side walls 1512 to form a hollow structure with one end open, and the heat management component 13 covers the opening to form the collection chamber 11b.

[0135] When the baffle plate 14 at least partially extends outside the pressure relief hole 131, the end of the baffle plate 14 away from the first wall 21a abuts against the bottom wall 1511 of the protective member 115 in the direction along the axis 1311 of the pressure relief hole 131. Fig.17 As shown, the baffle 14 may extend from the heat management component 13 to the protection member 115 , and one end of the baffle 14 away from the heat management component 14 abuts against the bottom wall 1511 of the protection member 115 .

[0136] The baffle 14 is pressed against the bottom wall of the protective member 115, which can support the heat management component 13 and maintain the distance between the heat management component 13 and the protective member 115, so that the space of the collection chamber 11b will not be squeezed and deformed, thereby reducing the possibility of the battery 10 exploding due to the compression of the space of the collection chamber 11b. In addition, in the case where two opposite baffles 14 are set in each pressure relief hole 131, if the lower end of the baffle 14 is pressed against the bottom wall 1511 of the protective member 115, the high-temperature exhaust can be discharged into two opposite channels under the action of the two baffles 14 after passing through the pressure relief hole 131, especially the high-temperature gas in the high-temperature exhaust can be concentrated and divided into two channels by the baffle 14 after entering the collection chamber 11b, further increasing the possibility of the high-temperature gas melting the second heat conducting plate 133 of the heat management component 14, so that the heat management component 13 can be destroyed on a large scale, and the internal fluid flows out in large quantities, thereby improving the cooling effect.

[0137] The above describes the battery and electrical equipment of the embodiments of the present application. The following describes the method and device for preparing the battery of the embodiments of the present application. For the parts not described in detail, please refer to the aforementioned embodiments.

[0138] Fig.18 FIG. 3 is a schematic flow chart of a method 300 for preparing a battery according to an embodiment of the present application. Fig.18 As shown, the method 300 may include: S310, providing a battery cell, the battery cell including a pressure relief mechanism, the pressure relief mechanism being disposed on a first wall of the battery cell, the pressure relief mechanism being used to actuate to release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value; S320, providing a thermal management component, the thermal management component being used to contain a fluid to regulate the temperature of the battery cell, the first surface of the thermal management component being attached to the first wall, the thermal management component being provided with a pressure relief hole opposite to the pressure relief mechanism, so that when the pressure relief mechanism is actuated, emissions discharged from the battery cell can be discharged through the pressure relief hole through the thermal management component; S330, providing a baffle, the baffle being used to cover a portion of the pressure relief hole, so that when the pressure relief mechanism is actuated, the discharge direction of the emissions entering the pressure relief hole is changed.

[0139] Fig.19FIG. 4 is a schematic block diagram of a device 400 for preparing a battery according to an embodiment of the present application. Fig.19 As shown, the device 400 may include: a providing module 410. The providing module 710 is used to: provide a battery cell, the battery cell includes a pressure relief mechanism, the pressure relief mechanism is arranged on the first wall of the battery cell, the pressure relief mechanism is used to actuate to release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold; provide a thermal management component, the thermal management component is used to contain a fluid to adjust the temperature of the battery cell, the first surface of the thermal management component is attached to the first wall, the thermal management component is provided with a pressure relief hole opposite to the pressure relief mechanism, so that when the pressure relief mechanism is actuated, the exhaust discharged from the battery cell can be discharged through the pressure relief hole through the thermal management component; provide a baffle, the baffle is used to cover a part of the pressure relief hole, so that when the pressure relief mechanism is actuated, the exhaust direction of the exhaust entering the pressure relief hole is changed.

[0140] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, characterized in that: include: A battery cell (20), comprising a pressure relief mechanism (213), wherein the pressure relief mechanism (213) is arranged on a first wall (21a) of the battery cell (20), and the pressure relief mechanism (213) is used to actuate to release the internal pressure when the internal pressure or temperature of the battery cell (20) reaches a threshold value; a heat management component (13) for containing a fluid to adjust the temperature of the battery cell (20); a first surface (1321) of the heat management component (13) being attached to the first wall (21a); ​​and the heat management component (13) being provided with a pressure relief hole (131) opposite to the pressure relief mechanism (213), so that when the pressure relief mechanism (213) is actuated, the exhaust discharged from the battery cell (20) can be discharged through the pressure relief hole (131) and through the heat management component (13); A baffle (14) is used to cover a portion of the pressure relief hole (131) so as to change the discharge direction of the discharge entering the pressure relief hole (131) when the pressure relief mechanism (213) is actuated.

2. The battery according to claim 1, characterized in that The maximum distance between the baffle (14) and the first wall (21a) is greater than the minimum distance from the first surface (1321) to the first wall (21a).

3. The battery according to claim 1, characterized in that The baffle plate (14) is inclined relative to the axis (1311) of the pressure relief hole (131), and along a direction away from the first wall (21a), the baffle plate (14) gradually approaches the axis (1311) of the pressure relief hole (131), so that when the pressure relief mechanism (213) is actuated, the discharge can impact toward the hole wall of the pressure relief hole (131).

4. The battery according to claim 3, characterized in that The angle between the baffle (14) and the axis (1311) of the pressure relief hole (131) is in the range of 20° to 40°.

5. The battery according to claim 1, characterized in that The pressure relief hole (131) is surrounded by two baffles (14) arranged opposite to each other.

6. The battery according to claim 1, characterized in that The ratio of the area of ​​the pressure relief hole (131) blocked by the baffle (14) to the area of ​​the pressure relief hole (131) is not less than 0.5 and not greater than 0.

8.

7. The battery according to claim 1, characterized in that The surface roughness of the baffle (14) is less than or equal to 0.1 μm.

8. The battery according to claim 1, characterized in that The baffle (14) is arranged on a second surface of the heat management component (13), the second surface being opposite to the first surface (1321) or the second surface being the hole wall of the pressure relief hole (131).

9. The battery according to any one of claims 1 to 8, characterized in that The battery also includes: An electrical chamber (11a) for accommodating a plurality of battery cells (20); a collecting chamber (11b) for collecting emissions discharged from the battery cell (20) and emissions from the thermal management component (13) when the pressure relief mechanism (213) is actuated; Wherein, the heat management component (13) is used to isolate the electrical cavity (11a) and the collecting cavity (11b).

10. The battery according to claim 9, characterized in that The battery also includes: A protective component (115), the protective component (115) is used to protect the thermal management component (13), and the protective component (115) and the thermal management component (13) form the collection chamber (11b).

11. The battery according to claim 10, characterized in that The protective member (115) comprises a bottom wall (1511) and a plurality of side walls (1512) to form a hollow structure with one end open, and the heat management component (13) covers the opening to form the collection chamber (11b).

12. The battery according to claim 11, characterized in that Along the axis (1311) of the pressure relief hole (131), one end of the baffle (14) away from the first wall (21a) abuts against the bottom wall (1511) of the protective component (115).

13. The battery according to any one of claims 1 to 8, characterized in that The heat management component (13) is used to be destroyed by the discharge after the discharge direction is changed when the pressure relief mechanism (213) is actuated, so that the fluid is discharged from the interior of the heat management component (13).

14. The battery according to claim 13, characterized in that A temperature-sensitive material is provided on the thermal management component (13), and the temperature-sensitive material is configured to be melted by the exhaust when the pressure relief mechanism (213) is actuated, so that the fluid is discharged from the interior of the thermal management component (13).

15. The battery according to claim 14, characterized in that The temperature-sensitive material is arranged on a region of the heat management component (13) facing the discharge of the battery cell (20).

16. An electrical device, characterized in that: include: The battery according to any one of claims 1 to 15, wherein the battery is used to provide electrical energy to the electrical device.

17. A method for preparing a battery, characterized in that: include: Providing a battery cell, the battery cell comprising a pressure relief mechanism, the pressure relief mechanism being disposed on a first wall of the battery cell, the pressure relief mechanism being configured to be actuated to release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value; providing a thermal management component, the thermal management component being used to contain a fluid to adjust the temperature of the battery cell, the first surface of the thermal management component being attached to the first wall, the thermal management component being provided with a pressure relief hole opposite to the pressure relief mechanism, so that when the pressure relief mechanism is actuated, the exhaust discharged from the battery cell can be discharged through the pressure relief hole through the thermal management component; A baffle is provided, the baffle being used to cover a portion of the pressure relief hole so as to change a discharge direction of the discharge entering the pressure relief hole when the pressure relief mechanism is actuated.

18. A device for preparing a battery, characterized in that: include: A providing module is provided, wherein the providing module is used for: Providing a battery cell, the battery cell comprising a pressure relief mechanism, the pressure relief mechanism being disposed on a first wall of the battery cell, the pressure relief mechanism being configured to be actuated to release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value; providing a thermal management component, the thermal management component being used to contain a fluid to adjust the temperature of the battery cell, the first surface of the thermal management component being attached to the first wall, the thermal management component being provided with a pressure relief hole opposite to the pressure relief mechanism, so that when the pressure relief mechanism is actuated, the exhaust discharged from the battery cell can be discharged through the pressure relief hole through the thermal management component; A baffle is provided, the baffle being used to cover a portion of the pressure relief hole so as to change a discharge direction of the discharge entering the pressure relief hole when the pressure relief mechanism is actuated.

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