Battery monomer and manufacturing equipment thereof, battery and electric equipment

Abstract

The embodiment of the utility model provides a battery monomer (20), manufacturing equipment (400) thereof, a battery (10) and electric equipment (1), so as to improve the performance of a pressure relief mechanism (23) on the battery monomer (20). The battery cell (20) comprises: a case (21); the plurality of electrode assemblies (22) are accommodated in the shell (21); and a pressure relief mechanism (23) which is arranged on a first wall (213) of the shell (21) and is located at a position on the first wall (213) opposite to a middle area between two adjacent electrode assemblies (22) in the plurality of electrode assemblies (22), and the pressure relief mechanism (23) is used for releasing the internal pressure of the battery monomer (20) when the internal pressure of the battery monomer (20) exceeds a threshold value.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery cell, its manufacturing equipment, a battery, and an electrical device. Background Art

[0002] Lithium-ion batteries have the advantages of small volume, high energy density, long cycle life, and long storage time, and are widely used in some fields such as electronic devices, electric transportation vehicles, and electric toys. For example, they are widely used in mobile phones, laptops, electric bicycles, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools.

[0003] With the continuous development of lithium-ion battery technology, higher requirements are also put forward for the safety performance of lithium-ion batteries. The pressure relief mechanism on a lithium-ion battery has an important impact on the safety performance of the lithium-ion battery. For example, when short circuit, overcharge, etc. occur in a lithium-ion battery, it may cause thermal runaway inside the lithium-ion battery and then a sudden increase in internal pressure. At this time, the pressure relief mechanism is required to release the internal pressure outward, thereby preventing the lithium-ion battery from exploding. Therefore, the design of the pressure relief mechanism is extremely important. Summary of the Utility Model

[0004] The present application provides a battery cell, its manufacturing equipment, a battery, and an electrical device to improve the performance of the pressure relief mechanism on the battery cell.

[0005] In a first aspect, a battery cell is provided, including: a housing; a plurality of electrode assemblies accommodated in the housing; and a pressure relief mechanism disposed on a first wall of the housing and located at a position opposite to a region between two adjacent electrode assemblies among the plurality of electrode assemblies, the pressure relief mechanism being configured to release the internal pressure of the battery cell when the internal pressure of the battery cell exceeds a threshold.

[0006] The battery cell of the present application includes a plurality of electrode assemblies, and a pressure relief mechanism is disposed on the first wall of the housing of the battery cell. The pressure relief mechanism is configured to release the internal pressure of the battery cell when the internal pressure of the battery cell exceeds a threshold. Among them, the pressure relief mechanism is located at a position opposite to a region between two adjacent electrode assemblies among the plurality of electrode assemblies. In this way, when the internal pressure of the battery cell reaches the threshold, the path available for the internal pressure to be released formed by the pressure relief mechanism is shorter, which is beneficial to the release of pressure and improves the safety of the battery cell.

[0007] In one implementation, the battery cell is a cuboid, and the pressure relief mechanism is located at a position opposite to a region between the two adjacent electrode assemblies arranged along the length direction of the battery cell on the first wall.

[0008] In this embodiment, the battery cell may be a cuboid, which includes an electrode assembly arranged along the length direction. Since the housing of the battery cell is relatively long, it is not conducive to the release of the internal pressure of the battery cell. Therefore, the pressure relief mechanism is arranged at a position on the first wall opposite to the area between two adjacent electrode assemblies arranged along the length direction of the battery cell, so that when the internal pressure of the battery cell exceeds the threshold, an effective path for the release of the internal pressure can be formed through the pressure relief mechanism, solving the problem that it is difficult to relieve pressure for a long battery cell.

[0009] In one implementation, the electrode assembly includes a first electrode tab and a second electrode tab, and the first electrode tab and the second electrode tab are wound around a winding axis, and the winding axis is parallel to the length direction of the battery cell; or, the electrode assembly includes a plurality of first electrode tabs and a plurality of second electrode tabs, and the plurality of first electrode tabs and the plurality of second electrode tabs are alternately stacked along a second direction, and the second direction is perpendicular to the length direction; or, the electrode assembly includes a first electrode tab and a plurality of second electrode tabs, the first electrode tab includes a plurality of stacked segments and a plurality of bent segments, the bent segments are used to connect two adjacent stacked segments, and the plurality of second electrode tabs and the plurality of stacked segments are alternately stacked along a second direction, and the second direction is perpendicular to the length direction.

[0010] In this embodiment, since the winding axis of the first electrode tab and the second electrode tab of the electrode assembly is parallel to the length direction of the battery cell, or the stacking direction of the first electrode tab and the second electrode tab of the electrode assembly is perpendicular to the length direction of the battery cell, most of the gas generated by the electrode assembly is discharged along the end of the first electrode tab in the length direction and the end of the second electrode tab in the length direction, and a gap for the gas to pass through is formed between the end of the first electrode tab in the length direction and the end of the second electrode tab in the length direction. The pressure relief mechanism is located at a position on the first wall opposite to the area between the first electrode assembly and the second electrode assembly arranged along the length direction. When the internal pressure of the battery cell exceeds the threshold, the gas can pass through the gap and act on the pressure relief mechanism to actuated the pressure relief mechanism, thereby releasing the internal pressure.

[0011] In one implementation, two electrode tabs of the electrode assembly are arranged on the first end face of the electrode assembly, the first end face is perpendicular to the length direction of the battery cell, and the electrode tabs of two adjacent electrode assemblies face opposite directions and both face the outside of the battery cell.

[0012] In this embodiment, the electrode tabs of two adjacent electrode assemblies can be respectively located at two end faces in the length direction of the battery cell, which is convenient for connecting the electrode terminals of the battery cell.

[0013] In one implementation, the housing has a first opening and a second opening opposite to each other along the length direction of the battery cell. The battery cell further includes a first end cap and a second end cap, and the first end cap and the second end cap are respectively used to cover the first opening and the second opening.

[0014] In this embodiment, the housing of the battery cell can have a first opening and a second opening along the length direction of the battery cell, and the battery cell further includes a first end cap and a second end cap respectively used to cover the first opening and the second opening, thereby facilitating the electrode assembly to enter the housing and simplifying the assembly process of the battery cell.

[0015] In one implementation, insulation is provided between the two adjacent electrode assemblies arranged along the length direction of the battery cell; a positive electrode terminal and a negative electrode terminal of the battery cell are provided on the first end cap, and are used to lead out the electrical energy of one of the two adjacent electrode assemblies; a positive electrode terminal and a negative electrode terminal of the battery cell are provided on the second end cap, and are used to lead out the electrical energy of the other of the two adjacent electrode assemblies.

[0016] In this embodiment, a positive electrode terminal and a negative electrode terminal of the battery cell are provided on both the first end cap and the second end cap. Since a set of electrode terminals are provided on both the first end cap and the second end cap, and insulation is provided between the adjacent electrode assemblies arranged along the length direction of the battery cell, therefore, the two sets of electrode terminals can respectively conduct the current of different electrode assemblies, so as to reduce the current flowing between the electrode assemblies, reduce the heat generated by the battery cell, and improve the charge and discharge performance of the battery cell.

[0017] In one implementation, the thickness of the first wall is greater than the thickness of the other walls of the housing except the first wall.

[0018] In this embodiment, the thickness of the first wall of the housing for setting the pressure relief mechanism is thicker than that of the other walls, thereby improving the welding reliability of the pressure relief mechanism, and making the first wall not easily deformed, so that the pressure relief mechanism is less affected by creep caused by the internal pressure. Furthermore, the bursting pressure of the pressure relief mechanism is less affected by this creep, so that the pressure relief mechanism can effectively release the internal pressure when the internal pressure is greater than the threshold. At the same time, reducing the thickness of the other walls also reduces the manufacturing cost of the housing.

[0019] In one implementation, the thickness at the effective position of the pressure relief mechanism is less than the thickness of the housing, and the effective position is the position where the pressure relief mechanism preferentially opens.

[0020] In this embodiment, by setting the thickness at the effective position of the pressure relief mechanism to be less than the thickness of the housing, when the internal pressure of the battery cell is greater than the threshold value, the pressure relief mechanism can be preferentially opened, thereby providing an effective pressure relief path.

[0021] In one implementation, the thickness of the pressure relief mechanism is greater than or equal to 0.01 mm and less than or equal to 0.5 mm.

[0022] When the thickness of the pressure relief mechanism is relatively large, it may not be able to be preferentially opened. When the thickness of the pressure relief mechanism is relatively small, the assembly difficulty increases, and it is easily damaged during the assembly process. The setting of the thickness of the pressure relief mechanism should consider the situation of the internal pressure of the battery cell. Generally, it should be matched with the above-mentioned threshold value so that the pressure relief mechanism can be preferentially opened when the internal pressure of the battery cell exceeds the threshold value. For example, the thickness of the pressure relief mechanism is set between 0.01 mm and 0.5 mm.

[0023] In one implementation, a notch is provided on the pressure relief mechanism, and the thickness of the pressure relief mechanism is the remaining thickness of the notch.

[0024] In this embodiment, a notch is provided on the pressure relief mechanism. When the internal pressure of the battery cell exceeds the threshold value, the pressure relief mechanism is preferentially opened through the notch, and the manufacturing process is simple and has a better pressure relief effect. At this time, the thickness of the pressure relief mechanism is the remaining thickness of the notch.

[0025] In one implementation, the thickness of the first wall is greater than or equal to 0.2 mm and less than or equal to 3 mm.

[0026] A relatively large thickness of the first wall will bring additional costs, and a relatively small thickness is likely to cause the bursting pressure of the pressure relief mechanism to be affected by creep caused by the internal pressure of the battery cell. Therefore, the thickness should be set within a suitable range, such as between 0.2 mm and 3 mm.

[0027] In one implementation, the thickness of the other walls of the housing except the first wall is greater than or equal to 0.2 mm and less than or equal to 1 mm.

[0028] A relatively large thickness of the other walls of the housing except the first wall will bring additional costs, and a relatively small thickness cannot ensure the structural stability of the battery cell. Therefore, the thickness of the other walls should be set within a suitable range, such as between 0.2 mm and 1 mm.

[0029] In one implementation, the first wall is the bottom wall of the housing.

[0030] In this embodiment, the first wall provided with the pressure relief mechanism is the bottom wall of the housing. That is to say, the pressure relief mechanism faces downward. In this way, when the battery is placed under the seat of the vehicle, the pressure relief mechanism can be away from the passengers, enabling the internal pressure of the battery cell to be discharged downward, reducing the risk of harm to the passengers.

[0031] In a second aspect, a battery is provided, including a plurality of battery cells described in the first aspect or any implementation manner of the first aspect, and the battery cells are used to provide electrical energy.

[0032] In a third aspect, an electrical device is provided, including a plurality of battery cells described in the first aspect or any implementation manner of the first aspect, and the battery cells are used to provide electrical energy.

[0033] In a fourth aspect, a manufacturing method of a battery cell is provided, including: providing a housing and a plurality of electrode assemblies, wherein a pressure relief mechanism is provided on the first wall of the housing, and the pressure relief mechanism is used to discharge the internal pressure of the battery cell when the internal pressure of the battery cell exceeds a threshold; accommodating the plurality of electrode assemblies in the housing so that the pressure relief mechanism is located at a position on the first wall opposite to the region between two adjacent electrode assemblies among the plurality of electrode assemblies.

[0034] In a fifth aspect, a manufacturing device of a battery cell is provided, including: a providing module, configured to provide a housing and a plurality of electrode assemblies, wherein a pressure relief mechanism is provided on the first wall of the housing, and the pressure relief mechanism is used to discharge the internal pressure of the battery cell when the internal pressure of the battery cell exceeds a threshold; an assembling module, configured to accommodate the plurality of electrode assemblies in the housing so that the pressure relief mechanism is located at a position on the first wall opposite to the region between two adjacent electrode assemblies among the plurality of electrode assemblies. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the drawings without creative efforts.

[0036] Figure 1 It is a schematic structural diagram of a vehicle according to an embodiment of the present application;

[0037] Figure 2 It is a schematic structural diagram of a battery according to an embodiment of the present application;

[0038] Figure 3 It is a schematic structural diagram of a battery cell according to an embodiment of the present application;

[0039] Figure 4 is Figure 3 a schematic diagram of the pressure relief path inside the battery cell shown;

[0040] Figure 5 is Figure 3 and Figure 4 a schematic diagram of the explosion of the battery cell shown;

[0041] Figure 6 a schematic structural diagram of an electrode assembly according to an embodiment of the present application;

[0042] Figure 7 a schematic structural diagram of another electrode assembly according to an embodiment of the present application;

[0043] Figure 8 a schematic structural diagram of yet another electrode assembly according to an embodiment of the present application;

[0044] Figure 9 a schematic structural diagram of the battery cell according to an embodiment of the present application;

[0045] Figure 10 a schematic diagram of the first wall of the battery cell according to an embodiment of the present application;

[0046] Figure 11 is Figure 10 a cross-sectional view of the battery cell shown along the A-A direction;

[0047] Figure 12 is Figure 11 an enlarged view of the partial area B of the battery cell shown;

[0048] Figure 13 a schematic flow chart of the manufacturing method of the battery cell according to an embodiment of the present application;

[0049] Figure 14 a schematic block diagram of the manufacturing equipment of the battery cell according to an embodiment of the present application.

[0050] In the drawings, the drawings are not drawn to actual scale. Detailed Embodiments

[0051] The following further describes in detail the embodiments of the present application in conjunction with the drawings and examples. The detailed descriptions and drawings of the following examples are used to exemplarily 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, the meaning of "a plurality of" is more than two; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed 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.

[0053] The orientation terms appearing in the following description are all 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 also be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" 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 those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0054] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings in the embodiments of the present application, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to the present application.

[0055] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the embodiments of the present application do not limit this. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of the present application do not limit this either. Generally, the battery cells are divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application do not limit this either.

[0056] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack, etc. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquids or other foreign substances from affecting the charging or discharging of the battery cells.

[0057] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode plate, a negative electrode plate, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector without the coated positive active material layer protrudes from the positive current collector with the coated positive active material layer. The positive current collector without the coated positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode plate includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector without the coated negative active material layer protrudes from the negative current collector with the coated negative active material layer. The negative current collector without the coated negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can pass through without fusing, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be polypropylene (PP) or polyethylene (PE), etc.

[0058] A pressure relief mechanism can be provided on the battery cell. The pressure relief mechanism is used to release the internal pressure of the battery cell when the internal pressure of the battery cell reaches a threshold value. When the internal pressure of the battery cell reaches the threshold value, a path for releasing the internal pressure can be formed through the pressure relief mechanism. As the number of electrode assemblies in the battery cell increases or decreases, the pressure relief path inside the battery cell becomes correspondingly longer, directly affecting the pressure relief effect.

[0059] Therefore, an embodiment of the present application provides a battery cell. The battery cell includes multiple electrode assemblies, and a pressure relief mechanism is provided on the first wall of the outer shell of the battery cell. Among them, the pressure relief mechanism is located at a position on the first wall opposite to the area between two adjacent electrode assemblies among the multiple electrode assemblies. In this way, when the internal pressure of the battery cell reaches the threshold value, the path for releasing the internal pressure formed through the pressure relief mechanism is shorter, which is beneficial to the release of pressure and improves the safety of the battery cell.

[0060] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using batteries.

[0061] The electrical equipment can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a stationary or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a planer, etc. The embodiments of the present application do not impose special restrictions on the above electrical equipment.

[0062] For the convenience of description, the following embodiments will take the electrical equipment as a vehicle as an example for description.

[0063] For example, as Figure 1 shown, it is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range electric vehicle, etc. A motor 40, a controller 30 and a battery 10 can be arranged inside the vehicle 1, and the controller 30 is used to control the battery 10 to supply power to the motor 40. For example, the battery 10 can be arranged at the bottom, the front end or the rear end of the vehicle 1. The battery 10 can be used for power supply of the vehicle 1. For example, the battery 10 can be used as the operating power source of the vehicle 1 for the circuit system of the vehicle 1, for example, for the working power requirements during the start, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 can not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1 to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1. The battery 10 can also be called a battery pack.

[0064] To meet different power usage requirements, the battery 10 can include a plurality of battery cells 20, and the plurality of battery cells 20 can be connected in series, parallel or in a hybrid connection, where the hybrid connection means a combination of series and parallel connections.

[0065] For example, Figure 2 shows a schematic structural diagram of a battery 10 according to an embodiment of the present application. The battery 10 can include a plurality of battery cells 20. The battery 10 can also include a box body 11, and the inside of the box body 11 is a hollow structure, and the plurality of battery cells 20 are accommodated in the box body 11. Figure 2 shows a possible implementation manner of the box body 11 according to an embodiment of the present application, as Figure 2As shown, the box body 11 can include two parts, which are respectively referred to as the first box body part 111 and the second box body part 112 here, and the first box body part 111 and the second box body part 112 are snapped together. The shapes of the first box body part 111 and the second box body part 112 can be determined according to the shape after combining a plurality of battery cells 20, and at least one of the first box body part 111 and the second box body part 112 has an opening. For example, as Figure 2 shown, both the first box body part 111 and the second box body part 112 can be hollow cuboids and each has only one open face. The openings of the first box body part 111 and the second box body part 112 are arranged opposite to each other, and the first box body part 111 and the second box body part 112 are snapped together to form a box body 11 with a closed chamber.

[0066] For another example, different from Figure 2 shown, only one of the first box body part 111 and the second box body part 112 can be a hollow cuboid with an opening, and the other can be plate-shaped to cover the opening. For example, here the second box body part 112 is a hollow cuboid and has only one open face, and the first box body part 111 is plate-shaped. Then the first box body part 111 covers the opening of the second box body part 112 to form a box body 11 with a closed chamber, and this chamber can be used to accommodate a plurality of battery cells 20. After a plurality of battery cells 20 are connected in parallel, in series or in a mixed connection, they are placed in the box body 11 formed after the first box body part 111 and the second box body part 112 are snapped together.

[0067] In some embodiments, the battery 10 may further include other structures, which will not be elaborated here. For example, the battery 10 may further include a busbar component, and the busbar component is used to achieve electrical connection between a plurality of battery cells 20, such as in parallel, in series or in a mixed connection. Specifically, the busbar component can achieve electrical connection between 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 a plurality of battery cells 20 can be further led out through a conductive mechanism through the box body 11.

[0068] According to different power requirements, the number of battery cells 20 in the battery 10 can be set to any value. A plurality of battery cells 20 can be connected in series, in parallel or in a mixed connection to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be relatively large, for the convenience of installation, the battery cells 20 are grouped, and each group of battery cells 20 forms 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. That is to say, a plurality of battery cells 20 can directly form the battery 10, or they can first form a battery module, and then the battery module forms the battery 10.

[0069] Figures 3 to 5The battery cell 20 according to an embodiment of the present application is shown. Among them, Figure 4 is Figure 3 a schematic diagram of a pressure relief path for the internal pressure of the battery cell 20 shown; Figure 5 is Figure 3 and Figure 4 a schematic diagram of the explosion of the battery cell 20 shown.

[0070] As Figures 3 to 5 shown, the battery cell 20 according to an embodiment of the present application includes a housing 21, a plurality of electrode assemblies 22, and a pressure relief mechanism 23. Among them, the plurality of electrode assemblies 22 are accommodated in the housing 21. The pressure relief mechanism 23 is disposed on the first wall 213 of the housing 21 and is located at a position opposite to the region between two adjacent electrode assemblies 22 among the plurality of electrode assemblies 22 on the first wall 213. The pressure relief mechanism 23 is configured to relieve the internal pressure of the battery cell 20 when the internal pressure of the battery cell 20 exceeds a threshold.

[0071] The embodiment of the present application does not limit the number of the plurality of electrode assemblies 22 included in the battery cell 20. For example, the battery cell 20 may include two electrode assemblies 22. In this case, the two electrode assemblies 22 may be arranged along the length direction X of the battery cell 20; for another example, the battery cell 20 may include multiple groups of electrode assemblies 22, and the multiple groups of electrode assemblies 22 may be arranged along the thickness direction Y of the battery cell 20, where each group of electrode assemblies 22 includes two electrode assemblies 22 arranged along the length direction X of the battery cell 20; for another example, the battery cell 20 may include more than two electrode assemblies 22, and these electrode assemblies 22 are arranged along the length direction X of the battery cell 20.

[0072] Hereinafter, taking the battery cell 20 including two electrode assemblies 22 and the two electrode assemblies 22 being arranged along the length direction X of the battery cell 20 as an example, the battery cell 20 according to an embodiment of the present application will be described.

[0073] When the battery cell 20 undergoes thermal runaway, its internal pressure will exceed the threshold. The pressure relief mechanism 23 can be actuated when the internal pressure of the battery cell reaches the threshold, forming a path for the internal pressure to be relieved, so as to relieve the internal pressure and reduce the risk of explosion of the battery cell 20, and improve the safety of the battery cell 20.

[0074] For the battery cell 20 according to an embodiment of the present application, for example, as Figures 3 to 5 shown, the pressure relief mechanism 23 can be disposed at a position opposite to the region between the first wall and the second electrode assembly 222 arranged along the length direction X on the first wall 213. Among them, Figure 4 the arrow in represents the pressure relief path. When the internal pressure of the battery cell 20 is greater than the threshold, the pressure relief mechanism 23 is actuated, and the internal pressure is relieved to the outside of the battery cell 20 along the arrow direction, achieving rapid pressure relief.Figure 4 The two square dashed boxes in

[0075] The above-mentioned "actuation" means that the pressure relief mechanism 23 generates an action, so that the internal pressure of the battery cell 20 can be released. The generation of the action of the pressure relief mechanism 23 includes but is not limited to at least a part of the pressure relief mechanism 23 breaking, melting, splitting, etc. When the pressure relief mechanism 23 is actuated, the internal pressure of the battery cell 20 will be released from the part where the pressure relief mechanism 23 is actuated, and may carry high-temperature and high-pressure excrement, such as electrolyte, fragments of the positive and negative electrode plates or separators that are dissolved or split, high-temperature and high-pressure gas or flame generated by the reaction, etc.

[0076] The embodiment of the present application does not limit the shape of the battery cell 20. For example, the battery cell 20 can be a cuboid, which includes electrode assemblies 22 arranged along the length direction X.

[0077] When the battery cell 20 is a cuboid, since the housing 21 of the battery cell 20 is relatively long, it is not conducive to the release of the internal pressure of the battery cell 20. Therefore, in one implementation, the pressure relief mechanism 23 is located at a position on the first wall 213 of the housing 21 opposite to the region between two adjacent electrode assemblies arranged along the length direction X of the battery cell 20, so that when the internal pressure of the battery cell 20 exceeds the threshold value, an effective path for the release of the internal pressure is formed through the pressure relief mechanism 23, solving the problem that it is not easy to relieve pressure for a long battery cell.

[0078] For example, as Figures 3 to 5 shown, the battery cell 20 is a cuboid, which includes a first electrode assembly 221 and a second electrode assembly 222. The first electrode assembly 221 and the second electrode assembly 222 are arranged along the length direction X of the battery cell 20. The pressure relief mechanism 23 is located at a position on the first wall 213 opposite to the region between the first electrode assembly 221 and the second electrode assembly 222 arranged along the length direction X.

[0079] In one implementation, an insulating sheet 24 is provided between two adjacent electrode assemblies 22. For example, as Figure 5 shown, an insulating sheet 24 is provided between the first electrode assembly 221 and the second electrode assembly 222 to reduce the possibility of contact between the first electrode assembly 221 and the second electrode assembly 222, reduce the risk of short circuit, and improve the safety of the battery cell 20.

[0080] In one implementation, the two tabs of the electrode assembly 22 are arranged on the first end face 223 of the electrode assembly 22. The first end face 223 is perpendicular to the length direction X of the battery cell 20. The tabs of two adjacent electrode assemblies 22 face opposite directions and both face the outside of the battery cell 20.

[0081] For example, as Figure 5 shown by the first electrode assembly 221, the tab 2212 of the first electrode assembly 221 is disposed on the first end face 223 of the first electrode assembly 221. The first end face 223 is perpendicular to the length direction X and faces the outside of the battery cell 20. The tab 2212 includes a first tab 2212a and a second tab 2212b, where one of the first tab 2212a and the second tab 2212b is a positive tab and the other is a negative tab. Similarly, for the second electrode assembly 222, the tab of the second electrode assembly 222 is disposed on the end face perpendicular to the length direction X of the second electrode assembly 222 and faces the outside of the battery cell 20. For the sake of brevity, it is not shown here.

[0082] It can be seen that by disposing the tabs of two adjacent electrode assemblies 22 on two end faces of the battery cell 20 in the length direction X respectively, it is convenient to connect the electrode terminals 241 of the battery cell 20.

[0083] In one implementation, as Figure 5 shown, the housing 21 has a first opening 2213 and a second opening 2214 opposite to each other along the length direction X of the battery cell 20. The battery cell 20 further includes a first end cap 2121 and a second end cap 2122, and the first end cap 2121 and the second end cap 2122 are respectively used to cover the first opening 2213 and the second opening 2214.

[0084] Since the housing 21 of the battery cell 20 has a first opening 2213 and a second opening 2214 along the length direction X of the battery cell 20, and the battery cell 20 further includes a first end cap 2121 and a second end cap 2122 respectively used to cover the first opening 2213 and the second opening 2214, it is convenient for the electrode assembly 22 to be inserted into the housing, simplifying the assembly process of the battery cell 20.

[0085] In one implementation, insulation is provided between two adjacent electrode assemblies 22 arranged along the length direction X of the battery cell 20; positive and negative electrode terminals of the battery cell 20 are provided on the first end cap 2121 for leading out the electrical energy of one of the two adjacent electrode assemblies 22; positive and negative electrode terminals of the battery cell 20 are provided on the second end cap 2122 for leading out the electrical energy of the other of the two adjacent electrode assemblies 22.

[0086] Since the positive electrode terminals and negative electrode terminals of the battery cell 20 are both provided on the first end cover 2121 and the second end cover 2122, that is, a set of electrode terminals is provided on both the first end cover 2121 and the second end cover 2122, and the adjacent electrode assemblies 22 arranged along the length direction X of the battery cell 20 are insulated from each other. Therefore, the two sets of electrode terminals can conduct the currents of different electrode assemblies 22 respectively, so as to reduce the current flowing between the electrode assemblies 22, reduce the heat generated by the battery cell, and improve the charge and discharge performance of the battery cell 20.

[0087] For example, as Figure 5 shown, a set of electrode terminals 241 of the battery cell 20 is provided on the first end cover 2121, including a first electrode terminal 241a and a second electrode terminal 241b; similarly, a set of electrode terminals 241 of the battery cell 20 is also provided on the second end cover 2122, including a first electrode terminal 241a and a second electrode terminal 241b. For the sake of simplicity, Figure 5 the electrode terminals 241 on the second end cover 2122 are not shown in the figure. Among them, one of the first electrode terminal 241a and the second electrode terminal 241b is a positive electrode terminal, and the other is a negative electrode terminal. The electrode terminals 241 on the first end cover 2121 and the electrode terminals 241 on the second end cover 2122 can conduct the currents of the first electrode assembly 221 and the second electrode assembly 222 respectively, so as to reduce the current flowing between the first electrode assembly 221 and the second electrode assembly 222, reduce the heat generated by the battery cell 20, and improve the charge and discharge performance of the battery cell 20.

[0088] In one implementation, as Figure 5 shown, the housing 21 further includes a partition 25 covering the first wall 213 of the housing 21 to isolate the surfaces of the plurality of electrode assemblies 22 from the housing 21.

[0089] In one implementation, as Figure 5 shown, the first wall 213 of the housing 21 is the wall with a smaller area on the housing 21. Since the first electrode assembly 221 and the second electrode assembly 222 will expand and squeeze the partition 25 covering the first wall 213 during the charging process, causing the deformation of the partition 25, and then causing the deformation of the pressure relief mechanism 23. Among them, the smaller the area, the smaller the expansion force received, and the smaller the degree of deformation. By arranging the pressure relief mechanism 23 on the first wall 213 with a smaller area on the housing 21, the deformation of the pressure relief mechanism 23 can be reduced, the risk of fatigue damage of the pressure relief mechanism 23 can be reduced, and the safety of the battery cell 20 can be improved.

[0090] The embodiments of the present application do not limit the type of the electrode assembly 22. For example, as Figure 6As shown, the electrode assembly 22 includes a first electrode tab 224 and a second electrode tab 225. The first electrode tab 224 and the second electrode tab 225 are wound around a winding axis, and the winding axis is parallel to the length direction X of the battery cell 20. For another example, as Figure 7 shown, the electrode assembly 22 includes a plurality of first electrode tabs 224 and a plurality of second electrode tabs 225. The plurality of first electrode tabs 224 and the plurality of second electrode tabs 225 are alternately stacked along the second direction Y, and the second direction Y is perpendicular to the length direction X of the battery cell 20. For another example, as Figure 8 shown, the electrode assembly 22 includes a first electrode tab 224 and a plurality of second electrode tabs 225. The first electrode tab 224 includes a plurality of stacked segments 224a and a plurality of bent segments 224b. The bent segments 224b are used to connect two adjacent stacked segments 224a. The plurality of second electrode tabs 225 and the plurality of stacked segments 224a are alternately stacked along the second direction Y, and the second direction Y is perpendicular to the length direction X of the electrode assembly 22.

[0091] Since the winding axis of the first electrode tab 224 and the second electrode tab 225 of the electrode assembly 22 is parallel to the length direction X of the battery cell 20, or the stacking direction of the first electrode tab 224 and the second electrode tab 225 of the electrode assembly 22 is perpendicular to its length direction X, most of the gas generated by the electrode assembly 22 is discharged along the ends of the first electrode tab in the length direction X and the ends of the second electrode tab in the length direction X. A gap for the gas to pass through is formed between the ends of the first electrode tab 224 in the length direction X and the ends of the second electrode tab 225 in the length direction X. The pressure relief mechanism 23 is located at a position on the first wall 213 corresponding to the region between the first electrode assembly 221 and the second electrode assembly 222 arranged along the length direction X. When the internal pressure of the battery cell 20 exceeds the threshold, the gas can pass through the gap and act on the pressure relief mechanism 23 to actuated the pressure relief mechanism 23, thereby releasing the internal pressure.

[0092] Wherein, one of the first electrode tab 224 and the second electrode tab 225 is a positive electrode tab, and the other is a negative electrode tab. Figure 6 and Figure 7 taking the second electrode tab 225 as the negative electrode tab and the first electrode tab 224 as the positive electrode tab as an example; Figure 8 taking the second electrode tab 225 as the positive electrode tab and the first electrode tab 224 as the negative electrode tab as an example. In one implementation, as Figures 6 to 8 shown, the electrode assembly 22 further includes a separator 226 for insulating and isolating the first electrode tab 224 and the second electrode tab 225.

[0093] In one implementation, as Figure 9As shown, the first wall 213 of the housing 21 is the bottom wall of the housing 21. That is to say, the pressure relief mechanism 23 faces downward. In this way, when the battery 10 is placed under the seat of the vehicle 1, the pressure relief mechanism 23 can be away from the passengers, enabling the internal pressure of the battery cell 20 to be discharged downward, reducing the risk of injury to the passengers.

[0094] To further improve the performance of the pressure relief mechanism 23, the present application also designs the thicknesses of the pressure relief mechanism 23 and the housing 21. Hereinafter, a specific description will be given in conjunction with Figures 10 to 12 this.

[0095] Figure 10 Fig. shows the first wall 213, on which the pressure relief mechanism 23 is provided. Figure 11 It is Figure 10 a cross-sectional view of the battery cell 20 shown along the A-A direction. Figure 12 It is Figure 11 an enlarged view of the partial area B of the battery cell 20 shown.

[0096] In one implementation, the thickness of the first wall 213 of the housing 21 is greater than the thicknesses of the other walls of the housing 21 except the first wall 213. For example, as Figure 11 shown, the thickness of the first wall 213 is greater than the thicknesses of the second wall 214, the third wall 215, and the fourth wall 216 of the housing 21 except the first wall 213. Since the thickness of the first wall 213 of the housing 21 where the pressure relief mechanism 23 is provided is thicker than the other walls of the housing 21 except the first wall 213, the thicker first wall 213 makes the welding reliability of the pressure relief mechanism 23 higher, and makes the first wall 213 not easily deformed, so that the pressure relief mechanism 23 is less affected by the creep caused by the internal pressure of the battery cell 20. Furthermore, the bursting pressure of the pressure relief mechanism 23 is less affected by this creep, enabling the pressure relief mechanism 23 to effectively discharge the internal pressure when the internal pressure is greater than the threshold. At the same time, reducing the thickness of the other walls also reduces the manufacturing cost of the housing 21.

[0097] In one implementation, the thickness of the pressure relief mechanism 23 is less than the thickness of the housing 21. The thickness of the pressure relief mechanism 23 is the thickness at the effective position of the pressure relief mechanism 23, and this effective position is the position where the pressure relief mechanism 23 preferentially opens. In this way, by setting the thickness of the pressure relief mechanism 23 to be less than the thickness of the housing 21, when the internal pressure of the battery cell 20 is greater than the threshold, the pressure relief mechanism 23 can preferentially open, thereby providing an effective path for pressure discharge.

[0098] For example, as Figure 11 and Figure 12As shown, the thickness of the first wall 213 of the housing 21 is greater than the thicknesses of the other walls of the housing 21 except the first wall 213, and the thickness of the pressure relief mechanism 23 is less than the thicknesses of the other walls of the housing 21 except the first wall 213. Assuming the thicknesses of the pressure relief mechanism 23, the first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 are T0, T1, T2, T3, and T4 respectively, the relationship between the thickness of the housing 21 and the thickness of the pressure relief mechanism 23 satisfies T0 < T2 = T3 = T4 < T1. Correspondingly, assuming the maximum pressures that the pressure relief mechanism 23, the first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 can withstand are P0, P1, P2, P3, and P4 respectively, then P0 < P2 = P3 = P4 < P1.

[0099] It can be seen that when the relationship between the thickness of the housing 21 and the thickness of the pressure relief mechanism 23 satisfies the above relationship, on the one hand, since the thickness of the pressure relief mechanism 23 is less than the thicknesses of the other walls of the housing 21, when the internal pressure of the battery cell 20 is greater than the threshold value, the pressure relief mechanism 23 can be opened preferentially, thereby providing an effective path for pressure relief; on the other hand, increasing the thickness of the first wall 213 can improve the welding reliability of the pressure relief mechanism 23 on the first wall 213 and make the first wall 213 not easily deformed, so that the pressure relief mechanism 23 is less affected by creep caused by the internal pressure, and further the bursting pressure of the pressure relief mechanism 23 is less affected by this creep, enabling the pressure relief mechanism 23 to effectively release the internal pressure when the internal pressure is greater than the threshold value. At the same time, reducing the thicknesses of the other walls also reduces the manufacturing cost of the housing 21.

[0100] Here, the thickness of the pressure relief mechanism 23 is the thickness at the effective position of the pressure relief mechanism 23, and the effective position is the position on the pressure relief mechanism 23 that is preferentially opened. For example, in one implementation, as Figure 12 shown, a notch 231 is provided on the pressure relief mechanism 23, and the thickness of the pressure relief mechanism 23 is the remaining thickness of the notch 231. When the internal pressure of the battery cell 20 exceeds the threshold value, the pressure relief mechanism 23 is preferentially opened through the notch 231, and the manufacturing process is simple and has a better pressure relief effect. At this time, the position where the notch 231 is located is the effective position of the pressure relief mechanism 23, and the thickness of the pressure relief mechanism 23 is the remaining thickness of the notch 231.

[0101] The above description is given by taking the battery cell 20 including the housing 21 and two end caps as an example. At this time, the housing 21 includes four walls, and the thickness of the first wall 213 among them is greater than the thicknesses of the other three walls. It should be understood that when the battery cell 20 includes the housing 21 and one end cap, the housing 21 includes five walls, and the thickness of the first wall 213 provided with the pressure relief mechanism 23 can be greater than the thicknesses of the other four walls.

[0102] The embodiments of the present application do not limit the form of the pressure relief mechanism 23. The pressure relief mechanism 23 may be a component relatively independent of the first wall 213. For example, an opening is provided on the first wall 213, the pressure relief mechanism 23 covers the opening, and a notch 231 is provided on the pressure relief mechanism 23; alternatively, the pressure relief mechanism 23 may also be a notch 231 directly formed on the first wall 213.

[0103] In order to avoid affecting the pressure relief performance of the pressure relief mechanism 23 during the assembly process, in one implementation, the pressure relief mechanism 23 is recessed into the first wall 213 of the housing 21, that is, buried in the first wall 213, so as to avoid the impact on the pressure relief mechanism 23 caused by collision, etc. during the assembly process of the pressure relief mechanism 23 and the housing 21.

[0104] When the thickness of the pressure relief mechanism 23 is relatively large, it may prevent it from opening preferentially. When the thickness of the pressure relief mechanism 23 is relatively small, the assembly difficulty increases, and it is easily damaged during the assembly process. The thickness of the pressure relief mechanism 23 should be set considering the internal pressure of the battery cell 20. Generally, it should match the above-mentioned threshold value so that the pressure relief mechanism can open preferentially when the internal pressure of the battery cell exceeds the threshold value. For example, in one implementation, the thickness T0 of the pressure relief mechanism 23 is greater than or equal to 0.01 mm and less than or equal to 0.5 mm.

[0105] A relatively large thickness of the first wall 213 will bring additional costs, and a relatively small thickness is likely to cause the bursting pressure of the pressure relief mechanism 23 to be affected by creep caused by the internal pressure of the battery cell 20. Therefore, its thickness should be set within a suitable range. For example, in one implementation, the thickness T1 of the first wall is greater than or equal to 0.2 mm and less than or equal to 3 mm.

[0106] A relatively large thickness of the other walls of the housing 21 except the first wall 213 will bring additional costs, and a relatively small thickness cannot ensure the structural stability of the battery cell 20. Therefore, the thickness of the other walls should also be set within a suitable range. For example, in one implementation, the thickness of the other walls of the housing 21 except the first wall 213 is greater than or equal to 0.2 mm and less than or equal to 1 mm.

[0107] In one possible specific implementation of the above battery cell 20, the pressure relief mechanism 23 on the battery cell 20 is provided on the first wall 213 of the housing 21, and the first wall 213 is the bottom wall of the housing 21. The pressure relief mechanism 23 is located at a position opposite to the area between two adjacent electrode assemblies 22 arranged along the length direction X of the battery cell 20 on the first wall 213. A notch 231 is provided on the pressure relief mechanism 23. Among them, the thickness of the first wall is greater than the thickness of the other walls of the housing except the first wall, and the remaining thickness of the notch 231 is less than the thickness of the housing 21.

[0108] As can be seen from the above description, the pressure relief mechanism 23 on the battery cell 20 of the embodiment of the present application is provided on the first wall 213 of the housing 21 and is located at a position on the first wall 213 opposite to the area between two adjacent electrode assemblies 22. When the internal pressure of the battery cell 20 reaches the threshold, the path formed by the pressure relief mechanism 23 for discharging the internal pressure is relatively short, which is beneficial to the discharge of the pressure, enabling the pressure relief mechanism 23 to have better performance and improving the safety of the battery cell 20.

[0109] The above has described the battery cell 20, the battery 10 and the electrical equipment such as the vehicle 1 of the embodiment of the present application. Next, the manufacturing method and manufacturing equipment of the battery cell 20 of the embodiment of the present application will be described. For parts not described in detail, reference can be made to the foregoing embodiments.

[0110] Figure 13 The schematic flowchart of the manufacturing method 300 of the battery cell 20 of the embodiment of the present application is shown. As Figure 13 shown, the manufacturing method 300 includes: providing a housing 21 and a plurality of electrode assemblies 22. A pressure relief mechanism 23 is provided on the first wall 213 of the housing 21. The pressure relief mechanism 23 is used to discharge the internal pressure of the battery cell 20 when the internal pressure of the battery cell 20 exceeds the threshold; accommodating the plurality of electrode assemblies 22 in the housing 21 so that the pressure relief mechanism 23 is located at a position on the first wall 213 opposite to the area between two adjacent electrode assemblies 22 among the plurality of electrode assemblies 22.

[0111] Figure 14 The schematic block diagram of the manufacturing equipment 400 of the battery cell 20 of the embodiment of the present application is shown. As Figure 14 shown, the equipment 400 includes: a providing module 410 for providing a housing 21 and a plurality of electrode assemblies. A pressure relief mechanism 23 is provided on the first wall 213 of the housing 21. The pressure relief mechanism 23 is used to discharge the internal pressure of the battery cell 20 when the internal pressure of the battery cell 20 exceeds the threshold; an assembling module 420 for accommodating the plurality of electrode assemblies 22 in the housing 21 so that the pressure relief mechanism 23 is located at a position on the first wall 213 opposite to the area between two adjacent electrode assemblies 22 among the plurality of electrode assemblies 22.

[0112] For the structure of the battery cell 20 manufactured by the above manufacturing method 300 and manufacturing equipment 400, reference can be made to the battery cell 20 in the above various implementation manners. For the sake of brevity, it will not be elaborated here.

[0113] It should be noted that, without conflict, the methods in the above various implementation manners can be combined with each other.

[0114] Although the present application has been described with reference to preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features 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 falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, it includes: a housing (21), including opposite openings and having a receiving space formed by a plurality of walls; a plurality of electrode assemblies (22), received in the receiving space; and, a pressure relief mechanism (23), disposed on a first wall (213) of the housing (21) and located at a position opposite to the middle between two adjacent electrode assemblies (22) among the plurality of electrode assemblies (22) on the first wall (213), the first wall (213) being the wall with the smallest area among the plurality of walls of the housing (21), and the pressure relief mechanism (23) is used to release the internal pressure of the battery cell when the internal pressure of the battery cell exceeds a threshold.

2. The battery cell according to claim 1, characterized in that, the battery cell is a cuboid, and the pressure relief mechanism (23) is located at a position opposite to a region between the two adjacent electrode assemblies (22) arranged along the length direction (X) of the battery cell on the first wall (213).

3. The battery cell according to claim 2, characterized in that, the electrode assembly (22) includes a first pole piece (224) and a second pole piece (225), the first pole piece (224) and the second pole piece (225) are wound around a winding axis, and the winding axis is parallel to the length direction (X) of the battery cell; or, the electrode assembly (22) includes a plurality of first pole pieces (224) and a plurality of second pole pieces (225), the plurality of first pole pieces (224) and the plurality of second pole pieces (225) are alternately stacked along a second direction (Y), and the second direction (Y) is perpendicular to the length direction (X); or, the electrode assembly (22) includes a first pole piece (224) and a plurality of second pole pieces (225), the first pole piece (224) includes a plurality of stacked segments (224a) and a plurality of bent segments (224b), the bent segments (224b) are used to connect two adjacent stacked segments (224a), and the plurality of second pole pieces (225) and the plurality of stacked segments (224a) are alternately stacked along a second direction (Y), and the second direction (Y) is perpendicular to the length direction (X).

4. The battery cell according to any one of claims 1 to 3, characterized in that, two tab ears of the electrode assembly (22) are disposed on a first end face (223) of the electrode assembly (22), the first end face (223) is perpendicular to the length direction (X) of the battery cell, the tab ears of two adjacent electrode assemblies (22) face opposite directions and both face the outside of the battery cell.

5. The battery cell according to any one of claims 1 to 3, characterized in that, The opening includes a first opening (2213) and a second opening (2214) that are opposite to each other along the length direction (X) of the battery cell. The battery cell further includes a first end cap (2121) and a second end cap (2122), and the first end cap (2121) and the second end cap (2122) are respectively used to cover the first opening (2213) and the second opening (2214).

6. The battery cell according to claim 5, wherein, insulation is provided between the two adjacent electrode assemblies (22) arranged along the length direction (X) of the battery cell, a positive electrode terminal and a negative electrode terminal of the battery cell are provided on the first end cap (2121) for leading out the electrical energy of one of the two adjacent electrode assemblies (22); a positive electrode terminal and a negative electrode terminal of the battery cell are provided on the second end cap (2122) for leading out the electrical energy of the other of the two adjacent electrode assemblies (22).

7. The battery cell according to any one of claims 1 to 3, wherein, the thickness of the first wall (213) is greater than the thicknesses of the other walls of the housing (21) except the first wall (213).

8. The battery cell according to any one of claims 1 to 3, wherein, the thickness at the effective position of the pressure relief mechanism (23) is less than the thickness of the housing (21), and the effective position is the position where the pressure relief mechanism (23) preferentially opens.

9. The battery cell according to claim 8, wherein, the thickness of the pressure relief mechanism (23) is greater than or equal to 0.01 mm and less than or equal to 0.5 mm.

10. The battery cell according to claim 8, wherein, a notch (231) is provided on the pressure relief mechanism (23), and the thickness of the pressure relief mechanism (23) is the remaining thickness of the notch (231).

11. The battery cell according to any one of claims 1 to 3, wherein, the thickness of the first wall (213) is greater than or equal to 0.2 mm and less than or equal to 3 mm.

12. The battery cell according to any one of claims 1 to 3, wherein, the thicknesses of the other walls of the housing (21) except the first wall (213) are greater than or equal to 0.2 mm and less than or equal to 1 mm.

13. The battery cell according to any one of claims 1 to 3, wherein, the first wall (213) is the bottom wall of the housing (21).

14. A battery, wherein, it includes: a plurality of battery cells according to any one of claims 1 to 13, and the battery cells are used to provide electrical energy.

15. An electrical device, wherein, it includes: a plurality of battery cells according to any one of claims 1 to 13, and the battery cells are used to provide electrical energy.

16. A manufacturing device for a battery cell, wherein, it includes: A providing module (410) for providing a housing (21) and a plurality of electrode assemblies (22), wherein a pressure relief mechanism (23) is provided on a first wall (213) of the housing (21), and wherein the first wall (213) is the wall with the smallest area among the plurality of walls of the housing (21) having opposite openings, and the pressure relief mechanism (23) is configured to release the internal pressure of the battery cell when the internal pressure of the battery cell exceeds a threshold value; An assembling module (420) for accommodating the plurality of electrode assemblies (22) within the housing (21) such that the pressure relief mechanism (23) is located at a position on the first wall (213) opposite to the region between two adjacent electrode assemblies (22) among the plurality of electrode assemblies (22).

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