Battery and method for manufacturing the same, manufacturing equipment and power-using device

Abstract

The embodiment of the present application provides a battery and a manufacturing method, manufacturing equipment and electrical device thereof, wherein the battery comprises: at least one battery layer (10'), each battery layer (10') comprises a plurality of battery cells (1) arranged side by side along a first direction (x), each battery cell (1) in the plurality of battery cells (1) comprises a shell (11) and an end cover (12) connected to each other; and at least one limiting member (2) arranged corresponding to the at least one battery layer (10') and covering the shell (11) to limit the movement of the corresponding battery layer (10') along a third direction (z), the third direction (z) being perpendicular to the at least one battery layer (10'), the at least one limiting member (2) comprising a first limiting member (2'), a weak area (21) being provided on the first limiting member (2'), the weak area (21) being configured to release pressure of the battery cell (1) through an area of ​​the shell (11) corresponding to the weak area (21) when the internal pressure of the battery cell (1) reaches a first threshold.

Description

Technical Field

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

[0002] Lithium-ion and other batteries are widely used in various devices due to their advantages such as high energy density, high power density, many cycles and long storage time.

[0003] In order to obtain more electrical energy, the battery connects multiple cylindrical battery cells in parallel and / or in series. In the related art, in order to release the pressure inside the battery cell in time when the battery thermal runaway occurs, a pressure relief mechanism is set on the end cover of each battery cell, so that when the battery thermal runaway occurs, the discharge inside the battery cell can be discharged through the pressure relief mechanism to avoid potential more serious accidents. However, in actual use, it is found that this type of battery is difficult to achieve a better exhaust effect, and the safety needs to be improved. Summary of the invention

[0004] The purpose of this application is to improve the safety of the battery during operation.

[0005] According to a first aspect of the present application, a battery is provided, comprising:

[0006] at least one battery layer, each of the at least one battery layer comprising a plurality of battery cells arranged side by side along a first direction, each of the plurality of battery cells comprising a housing and an end cover connected to each other; and

[0007] At least one limiter is arranged corresponding to at least one battery layer and covers the shell to limit the movement of the corresponding battery layer along a third direction, and the third direction is perpendicular to at least one battery layer. The at least one limiter includes a first limiter, and a weak area is provided on the first limiter. The weak area is configured to release pressure from the battery cell through the area of ​​the shell corresponding to the weak area when the internal pressure of the battery cell reaches a first threshold.

[0008] In the above scheme, a weak area is set on the first stopper of at least one stopper, and the weak area is configured to release pressure from the battery cell through the area corresponding to the shell and the weak area when the internal pressure of the battery cell reaches the first threshold. When such a battery has thermal runaway, the limiting effect of the first stopper on the shell in the weak area is reduced, and the emissions generated by the pressure release can be discharged from the battery cell through the area corresponding to the shell and the weak area. This method of achieving pressure release through the shell of the battery cell is conducive to increasing the area of ​​the pressure release area, ensuring that the internal emissions of the battery cell are discharged stably and smoothly, preventing instantaneous explosion and fire, and improving the safety of the battery during operation.

[0009] In some embodiments, the battery includes a plurality of battery layers stacked along a third direction, and a first limiting member is disposed between each two adjacent battery layers.

[0010] In the above solution, when thermal runaway occurs, the battery can ensure that the battery cells in each battery layer can release pressure through the area corresponding to the weak area, thereby improving the safety of the battery operation.

[0011] In some embodiments, the weak area is configured to form a channel for the exhaust of the battery cell to be discharged outward when the battery cell is depressurized.

[0012] In the above scheme, the weak area not only reduces the limiting effect on the shell, allowing the battery cell to release pressure at the position corresponding to the weak area on the shell, but also allows the emissions to be discharged to the outside of the battery in time after the battery cell is depressurized, which is beneficial to quickly release the pressure and heat inside the battery cell and improve the reliability of the battery operation.

[0013] In some embodiments, at least one of the limiting members is a first limiting member, and each of the first limiting members is provided with a weak area at the position where each battery cell in the corresponding battery layer is located.

[0014] In the above solution, when thermal runaway occurs in any battery cell, pressure can be released through the area corresponding to the shell and the weak area, thereby improving the safety of battery operation.

[0015] In some embodiments, a plurality of weak areas are arranged on the first limiting member at intervals along the first direction.

[0016] In the above solution, more battery cells in the same battery layer can release pressure through the area corresponding to the weak area.

[0017] In some embodiments, the weak area covers at least two adjacent battery cells along the first direction.

[0018] In the above scheme, when the size of the battery cell along the first direction is small, such as a cylindrical battery, at least two adjacent battery cells share a weak area, which can reduce the difficulty of processing and also help increase the pressure relief area of ​​the shell when the battery cell has thermal runaway. Moreover, for the embodiment in which the weak area is connected along the thickness direction of the first limiter during pressure relief, at least two adjacent battery cells share a channel for the discharge of the discharge to the outside, which can achieve rapid discharge.

[0019] In some embodiments, in a second direction, a size of the weak area is smaller than a size of the shell, and the second direction is perpendicular to a plane formed by the first direction and the third direction.

[0020] In the above solution, while allowing the battery cell to release pressure in the area corresponding to the weak area, a stable pressing force is provided to the battery cell in the area outside the weak area, so that the battery cell can achieve stable pressure release.

[0021] In some embodiments, in the second direction, the weak zone is provided in a middle region of the housing.

[0022] In the above scheme, on the one hand, this structure enables the stopper to reliably press the shell at both ends along the second direction, so that the battery cell is depressurized in the middle area of ​​the shell, which can improve the stability of pressure relief. On the other hand, in the second direction, the middle area of ​​the shell is less restrained by the end cover and is easier to deform. Therefore, the weak area is set corresponding to the middle area of ​​the shell in the second direction, which can make the area on the shell corresponding to the weak area easier to explode for pressure relief.

[0023] In some embodiments, a projection of the weakened area in a reference plane perpendicular to the third direction is rectangular.

[0024] In the above scheme, this structural form is conducive to increasing the area of ​​the weak zone, so as to increase the area of ​​the pressure relief area, ensure that the internal emissions of the battery cell are discharged stably and smoothly, prevent instantaneous explosion and fire, and improve the safety of the battery during operation.

[0025] In some embodiments, the weak area includes at least one of a through hole and a reduced thickness portion.

[0026] In the above scheme, when the weak area includes a through hole, it is easy to process, and when the battery has thermal runaway, since the first limiting member does not limit the shell of the battery cell in the area where the through hole is located, the area on the shell corresponding to the through hole is a strength weak area. When the internal pressure of the battery cell reaches a first threshold, the area on the shell corresponding to the through hole explodes, so that the emissions of the battery cell can be discharged stably and smoothly outside the battery cell, thereby improving the safety of the battery during operation.

[0027] In the above scheme, when the weak area includes a thickness reduction portion, the pressure of the battery cell pressure relief can be controlled by designing the thickness of the weak area, so as to set a suitable pressure relief pressure for the battery cell according to the working environment and safety requirements of the battery. The first limiter has a small restraining force on the shell of the battery cell in the area where the thickness reduction portion is located, so this area is an easy-to-explode area. When the internal pressure of the battery cell reaches the first threshold, the area on the shell corresponding to the thickness reduction portion explodes, so that the discharge of the battery cell is stably and smoothly discharged from the battery cell, thereby improving the safety of the battery during operation.

[0028] In some embodiments, there is a gap between adjacent battery cells in the same battery layer, and the gap is connected to the weak area.

[0029] In the above scheme, the gap forms a channel for the emissions generated when the battery cells are depressurized to be discharged outward, so as to achieve rapid pressure reduction and reduce the risk of chain reactions between adjacent battery cells during thermal runaway.

[0030] In some embodiments, a pressure relief mechanism is provided on the battery cell, and the pressure relief mechanism is configured to release pressure when the internal pressure of the battery cell reaches a first threshold.

[0031] In the above scheme, by arranging a pressure relief mechanism on the battery cell, when the pressure relief mechanism is arranged on the end cover or the shell in an area outside the weak area, when the internal pressure of the battery cell reaches a first threshold, the pressure can be released through the pressure relief mechanism and the area corresponding to the weak area on the shell at the same time, thereby increasing the total area of ​​the pressure relief channel and improving the pressure relief speed; when the pressure relief mechanism is arranged in the area corresponding to the weak area on the shell, when the internal pressure of the battery cell reaches the first threshold, the area corresponding to the weak area on the shell can be broken in a more controllable manner, thereby improving the pressure relief reliability.

[0032] In some embodiments, the area of ​​the weakened region is larger than the area of ​​the pressure relief mechanism.

[0033] In the above solution, when the battery cell is in thermal runaway, the area on the shell corresponding to the weak area can play a major role in pressure relief, and the pressure relief mechanism plays an auxiliary role in pressure relief.

[0034] In some embodiments, the pressure relief mechanism is disposed on the shell, and the pressure relief mechanism is disposed corresponding to the weak area.

[0035] In the above solution, when the internal pressure of the battery cell reaches the first threshold, the area on the shell corresponding to the weak area can be more easily broken through for pressure relief, and the pressure relief pressure can be more controllable, thereby improving the reliability of pressure relief.

[0036] In some embodiments, at least one stopper is made of metal material.

[0037] In the above solution, at least one limiter is made of metal material to improve the rigidity of the limiter and provide reliable pressing force to the battery cell shell, so that the battery cell can stably release pressure through the area on the shell corresponding to the weak area when thermal runaway occurs.

[0038] In some embodiments, an insulating film is provided between each of the at least one limiting member and an adjacent battery cell to insulate the limiting member from the battery cell.

[0039] In the above solution, an insulating film is provided between each of the at least one limiting member and the adjacent battery cell, which can ensure the insulation between the limiting member and the battery cell, prevent the battery cell from short circuiting, and improve the reliability of the battery operation.

[0040] In some embodiments, the battery cell is cylindrical, and each of the at least one limiting member is provided with a recessed portion, which is configured to accommodate the battery cell to limit movement of the battery cell along the first direction and the third direction.

[0041] In the above scheme, by providing a recessed portion on the limiting member, the movement of the battery cell along the first direction and the third direction can be more reliably limited to prevent the battery cell from vibrating during operation and moving, and it is convenient to maintain the gap L between adjacent battery cells in the same battery layer during assembly.

[0042] According to a second aspect of the present application, there is provided an electrical device, comprising the battery described in the above embodiment, wherein the battery is used to provide electrical energy to the electrical device.

[0043] In the above scheme, by using a battery that can achieve stable exhaust when thermal runaway occurs in the electrical device, it is possible to prevent the battery from exploding and catching fire, thereby improving the reliability and safety of the electrical device.

[0044] According to a third aspect of the present application, a method for manufacturing a battery is provided, comprising:

[0045] Assembling to form at least one battery layer, each of the at least one battery layer comprises a plurality of battery cells arranged side by side along a first direction, each of the plurality of battery cells comprises a housing and an end cover connected to each other;

[0046] Providing at least one stopper, the at least one stopper comprising a first stopper, the first stopper being provided with a weak area, the weak area being configured to release pressure from the battery cell through an area of ​​the housing corresponding to the weak area when the internal pressure of the battery cell reaches a first threshold;

[0047] At least one limiting member is disposed corresponding to at least one battery layer and covers the shell to limit the movement of the corresponding battery layer along a third direction perpendicular to the first direction, wherein the third direction is perpendicular to the at least one battery layer.

[0048] In the above scheme, when the battery produced by this manufacturing method suffers from thermal runaway, the limiting effect of the first limiting member on the shell in the weak area is smaller than that in other areas, and the area corresponding to the shell and the weak area ruptures first to release pressure, and the emissions generated by the pressure release can be discharged from the battery cell through the area corresponding to the shell and the weak area. This method of achieving pressure release through the shell of the battery cell is conducive to increasing the area of ​​the pressure release area, ensuring that the emissions inside the battery cell are discharged stably and smoothly, preventing instantaneous explosion and fire, and improving the safety of the battery during operation.

[0049] According to a fourth aspect of the present application, there is provided a battery manufacturing device, comprising:

[0050] A battery layer assembly device, configured to assemble and form at least one battery layer, each of the at least one battery layer comprises a plurality of battery cells arranged side by side along a first direction, each of the plurality of battery cells comprises a housing and an end cover connected to each other;

[0051] A stopper providing device configured to provide at least one stopper, wherein the at least one stopper includes a first stopper, and a weak area is provided on the first stopper, so that when the internal pressure of the battery cell reaches a first threshold, the battery cell is depressurized through an area of ​​the housing corresponding to the weak area; and

[0052] The battery assembly equipment is configured such that at least one limiting member is arranged corresponding to at least one battery layer and covers the shell to limit the movement of the corresponding battery layer along a third direction perpendicular to the first direction, and the third direction is perpendicular to at least one battery layer.

[0053] In the above scheme, when thermal runaway occurs in the battery produced by this manufacturing equipment, the limiting effect of the first limiter on the shell in the weak area is smaller than that in other areas, and the area corresponding to the shell and the weak area is ruptured first to release pressure, and the emissions generated by the pressure release can be discharged from the battery cell through the area corresponding to the shell and the weak area. This method of achieving pressure release through the shell of the battery cell is conducive to increasing the area of ​​the pressure release area, ensuring that the emissions inside the battery cell are discharged stably and smoothly, preventing instantaneous explosion and fire, and improving the safety of the battery during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0055] Figure 1 It is a schematic diagram of the structure of some embodiments of installing a battery in a vehicle using the present application.

[0056] Figure 2 This is a schematic diagram of the internal structure of the battery in some embodiments of the battery of the present application.

[0057] Figure 3 This is a schematic structural diagram of the first position-limiting member in some embodiments of the battery of the present application.

[0058] Figure 4 This is a top view of the internal structure of the battery in some embodiments of the battery of the present application.

[0059] Figure 5 for Figure 4 AA section view.

[0060] Figure 6 for Figure 5 Enlarged view of point B.

[0061] Figure 7 This is a top view of the internal structure of the battery in some other embodiments of the battery of the present application.

[0062] Figure 8 for Figure 7 Partial cross-sectional view of CC in.

[0063] Fig. 9 Schematic diagram of some embodiments of the battery manufacturing method of the present application.

[0064] Fig.10 Schematic diagram of the module composition of some embodiments of the battery manufacturing equipment of the present application.

[0065] In the drawings, the drawings are not drawn to scale.

[0066] Marking Description:

[0067] 100, vehicle; 101, axle; 102, wheel; 103, motor; 104, controller;

[0068] 200. Battery manufacturing equipment; 210. Battery layer assembly equipment; 220. Position limiter providing equipment; 230. Battery assembly equipment;

[0069] 10. Battery; 10', battery layer; 1. Battery cell; 11. Shell; 111. Pressure relief mechanism; 12. End cover; 121. Electrode terminal; 122. Liquid injection hole; 2. Stopper; 2', first stopper; 21. Weak area; 21', through hole; 22. Concave portion; 3. Insulating film. DETAILED DESCRIPTION

[0070] 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.

[0071] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than 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.

[0072] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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.

[0073] In order to clearly describe various directions in the following embodiments, various directions are defined below. Figure 2 Taking the coordinate system as an example, the first direction x is the arrangement direction of multiple battery cells 1 in each battery layer 10', and the second direction y is perpendicular to the first direction x in the plane where the battery layer 10' is located; the third direction z is perpendicular to the battery layer 10', that is, the third direction z is perpendicular to the first direction x and the second direction y.

[0074] Based on this orientation definition, descriptions of orientation or positional relationships indicated by "up", "down", "top", "bottom", "front", "back", "inside" and "outside" are used only to facilitate the description of the present application, and do not indicate or imply that the device referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the scope of protection of the present application.

[0075] As part of the invention process of this application, the inventor has conducted numerous tests and verifications and found that one of the reasons for the low safety of the battery is that when thermal runaway occurs in the battery cell, due to the small area of ​​the battery cell end cover, the opening of the pressure relief mechanism provided on the end cover is small, and the exhaust channel after the battery thermal runaway is small. The small exhaust channel makes the exhaust untimely, making the battery cell prone to explosion and fire.

[0076] Among them, 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 threshold design varies according to different design requirements. The 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 take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and can specifically adopt pressure-sensitive or temperature-sensitive elements or structures, that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action or the weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0077] The "actuation" mentioned in this application means that the pressure relief mechanism is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The action produced by the pressure relief mechanism may include but is not limited to: at least a part of the pressure relief mechanism is broken, shattered, torn or opened, etc. When the pressure relief mechanism is actuated, the internal discharge of the battery cell will be discharged outward from the actuated part. In this way, the pressure and temperature of the battery cell can be released under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0078] Among them, the emissions from battery cells mentioned here include but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of isolation membrane, high-temperature and high-pressure gases produced by the reaction (such as CH4, CO and other combustible gases), flames, etc.

[0079] In view of this, the present application intends to change the exhaust method of the battery when thermal runaway occurs, with the main purpose of improving the smoothness of the exhaust so that the gas inside the battery cell can be discharged stably.

[0080] The battery can be used in an electrical device, and the battery is configured to provide electrical energy to the electrical device. The electrical device can be a mobile phone, a portable device, a laptop computer, a battery car, an electric car, a ship, a spacecraft, an electric toy, an electric tool, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer.

[0081] like Figure 1As shown, the electrical device may be a vehicle 100, such as a new energy vehicle, which may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; or the device using the battery may also be a drone or a ship, etc. The vehicle 100 includes a battery 10, which is used to provide electrical energy for the operation of the vehicle. The battery 10 that can achieve stable exhaust when thermal runaway occurs can prevent explosion and fire, and can improve the reliability and safety of the operation of the electrical device.

[0082] The vehicle 100 also includes an axle 101, wheels 102 connected to the axle 101, a motor 103, a controller 104 and a battery 10. The motor 103 is used to drive the axle 101 to rotate, the controller 104 is used to control the operation of the motor 103, and the battery 10 is used to provide electrical energy for the operation of the motor 103 and other components in the vehicle.

[0083] The battery may include a box (not shown in the figure) and a battery cell. The box is a hollow structure and the battery cell is accommodated in the box. The box is used to provide a storage space for the battery cell. In some embodiments, the box may include a first part and a second part, and the first part and the second part cover each other to define a storage space for accommodating the battery cell. Of course, the connection between the first part and the second part can be sealed by a seal (not shown in the figure), and the seal may be a sealing ring, a sealant, etc.

[0084] In a battery, there can be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells is accommodated in a box; of course, multiple battery cells can also be connected in series, in parallel, or in a mixed connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in a box. The battery cell can be a secondary battery in cylindrical, square, or other shapes.

[0085] The battery cell may include a shell, an electrode assembly and an end cap. The shell has an opening, the electrode assembly is accommodated in the shell, and the end cap is used to close the opening of the shell. The electrode assembly may include a positive electrode sheet, a negative electrode sheet (not shown) and a separator (not shown). The electrode assembly may be a wound structure formed by winding the positive electrode sheet, the separator and the negative electrode sheet, or a stacked structure formed by stacking the positive electrode sheet, the separator and the negative electrode sheet. The electrode assembly also includes a positive electrode tab and a negative electrode tab, which may be a positive electrode current collector in the positive electrode sheet that is not coated with a positive electrode active material layer as the positive electrode tab, and may be a negative electrode current collector in the negative electrode sheet that is not coated with a negative electrode active material layer as the negative electrode tab.

[0086] In some embodiments, Figure 2As shown, the battery 10 includes: at least one battery layer 10 ′ and at least one stopper 2 .

[0087] The battery 10 may include one battery layer 10', or multiple battery layers 10' may be stacked along a third direction z, and the third direction z is perpendicular to at least one battery layer 10'. Each battery layer 10' in the at least one battery layer 10' includes multiple battery cells 1 arranged side by side along a first direction x, and each battery cell 1 in the multiple battery cells 1 includes a housing 11 and an end cover 12 connected to each other.

[0088] The following embodiments are described by taking a cylindrical battery cell 1 as an example. The axis of each battery cell 1 is consistent with the second direction y. The second direction y is perpendicular to the first direction x in the plane where the battery layer 10 ′ is located.

[0089] At least one limiting member 2 is disposed corresponding to at least one battery layer 10 ′ and covers the housing 11 to limit the corresponding battery layer 10 ′ from moving along a third direction z, which is perpendicular to the at least one battery layer 10 ′.

[0090] At least one stopper 2 includes a first stopper 2', and a weak area 21 is provided on the first stopper 2'. The weak area 21 is configured to release pressure from the battery cell 1 through an area of ​​the housing 11 corresponding to the weak area 21 when the internal pressure of the battery cell 1 reaches a first threshold. After the pressure is released, the discharge in the battery cell 1 is discharged from the housing 11.

[0091] The battery 10 of this embodiment is provided with a weak area 21 on the first stopper 2' in at least one stopper 2. The weak area 21 is configured to release pressure from the battery cell 1 through the area corresponding to the shell 11 and the weak area 21 when the internal pressure of the battery cell 1 reaches the first threshold. When thermal runaway occurs in this battery 10, the limiting effect of the first stopper 2' on the shell 11 in the weak area 21 is reduced compared with other areas. The area corresponding to the shell 11 and the weak area 21 is first ruptured to release pressure. The emissions generated by the pressure release can be discharged from the battery cell 1 through the area corresponding to the shell 11 and the weak area 21. This method of achieving pressure release through the shell 11 of the battery cell 1 is conducive to increasing the area of ​​the pressure release area, ensuring that the internal emissions of the battery cell 1 are discharged stably and smoothly, preventing instantaneous explosion and fire, and improving the safety of the battery 10 during operation.

[0092] For example, for a cylindrical battery cell 1, due to the small area of ​​the end cap 12, the opening of the pressure relief mechanism set on the end cap 12 is small, and the exhaust channel is small after the battery thermal runaway. The small exhaust channel makes the exhaust untimely, making the battery cell 1 prone to explosion and fire. In the embodiment of the present application, the pressure relief position during thermal runaway can be set on the shell 11. The shell 11 has a large area, which is conducive to increasing the area of ​​the pressure relief area, ensuring that the internal emissions of the battery cell 1 are discharged stably and smoothly, preventing instantaneous explosion and fire, and improving the safety of the battery 10 during operation. Therefore, the battery 10 of the present application is very suitable for battery cells 1 with smaller volumes, and the pressure relief mechanism can be eliminated on the end cap 12.

[0093] The limiting member 2 may be a limiting plate or a limiting block, etc. The shape and area of ​​the weak area 21 may be determined according to a thermal runaway test of a single battery cell 1 .

[0094] In some embodiments, the stopper 2 is arranged on the side of the battery layer 10' along the third direction z, and can be located on one side or both sides of the battery layer 10'. The stopper 2 arranged adjacent to a battery layer 10' is the stopper 2 corresponding to the battery layer 10'. The stopper 2 and the housing 11 can be in direct contact or an adhesive layer can be arranged between the two.

[0095] The weak area 21 in this embodiment may take one or a combination of the following forms, but is not limited thereto.

[0096] In one structural form, such as Figure 3 As shown, the weak area 21 includes a through hole 21'. The weak area 21 is formed by setting the through hole 21', which is easy to process, and when the battery 10 has thermal runaway, since the first limiter 2' does not limit the shell 11 of the battery cell 1 in the area where the through hole 21' is located, the area on the shell 11 corresponding to the through hole 21' is a strength weak area. When the internal pressure of the battery cell 1 reaches the first threshold, the area on the shell 11 corresponding to the through hole 21' explodes, so that the discharge of the battery cell 1 is stably and smoothly discharged from the battery cell 1, thereby improving the safety of the battery 10 during operation.

[0097] In another structural form, the weak area 21 includes a thickness reduction portion (not shown in the figure). The weak area 21 is formed by thinning the local thickness of the first limiter 2', and the pressure of the battery cell 1 can be controlled by designing the thickness of the weak area 21 to set a suitable pressure relief pressure for the battery cell 1 according to the working environment and safety requirements of the battery 10. The first limiter 2' has a small restraining force on the shell 11 of the battery cell 1 in the area where the thickness reduction portion is located, so this area is an explosion-prone area. When the internal pressure of the battery cell 1 reaches the first threshold, the area on the shell 11 corresponding to the thickness reduction portion explodes, so that the discharge of the battery cell 1 can be stably and smoothly discharged from the battery cell 1, thereby improving the safety of the battery 10 during operation.

[0098] In some embodiments, Figure 2 As shown, when the battery cell 1 is depressurized, the weak area 21 is configured to form a channel for the discharge of the battery cell 1 to be discharged outwardly when the battery cell 1 is depressurized. Here, the discharge outwardly means that the discharge of the battery cell 1 passes through the weak area 21 and is discharged to the opposite side of the first stopper 2', flows toward the outermost first stopper 2', and finally is discharged to the outside of the battery 10.

[0099] For example, when the weak area 21 is a through hole 21', the through hole 21' can directly form a channel for the discharge to be discharged when the battery cell 1 is depressurized. When the weak area 21 is a thickness reduction portion, the thickness reduction portion is destroyed when the battery cell 1 is depressurized, and penetrates the first stopper 2' in the thickness direction to form a channel for the discharge to be discharged.

[0100] In this embodiment, the weak area 21 not only reduces the limiting effect on the shell 11, allowing the battery cell 1 to release pressure at a position on the shell 11 corresponding to the weak area 21, but also allows the emissions to be discharged to the outside of the battery 10 in time after the battery cell 1 is depressurized, which is beneficial to quickly release the pressure and heat inside the battery cell 1 and improve the reliability of the battery 10.

[0101] In some embodiments, Figure 2 As shown, the battery 10 includes a plurality of battery layers 10' stacked along a third direction z, and a first stopper 2' is disposed between two adjacent battery layers 10'.

[0102] This embodiment can ensure that the battery cells 1 in each battery layer 10 ′ can release pressure through the area corresponding to the weak area 21 when thermal runaway occurs, thereby improving the safety of the battery 10 .

[0103] On this basis, the outer side surface of the outer battery layer 10' is also covered with a first limiter 2', which is equivalent to setting two first limiters 2' corresponding to the outer battery layer 10', so that the battery cells 1 in the outer battery layer 10' can release pressure through a larger area on the shell 11, thereby optimizing the pressure relief effect.

[0104] In some embodiments, Figure 2 As shown, at least one of the limiting members 2 is a first limiting member 2 ′, and each of the first limiting members 2 ′ is provided with a weak area 21 at the position where each battery cell 1 is located in the corresponding battery layer 10 ′.

[0105] This embodiment enables any battery cell 1 to release pressure through the area corresponding to the housing 11 and the weak area 21 when thermal runaway occurs, thereby improving the safety of the battery 10 .

[0106] In some embodiments, at least one stopper 2 includes a plurality of stoppers 2, the plurality of stoppers 2 include a first stopper 2' and a second stopper (not shown in the figure), and the second stopper is not provided with a weak area 21. By providing a weak area 21 on some of the stoppers 2, the pressure relief effect of some battery cells 1 can also be optimized, thereby improving the safety of the battery 10.

[0107] In some embodiments, Figure 2 As shown, a plurality of weak areas 21 are arranged at intervals along the first direction x on the first stopper 2'. This structure enables more battery cells 1 in the same battery layer 10' to release pressure through the areas corresponding to the weak areas 21. For example, the plurality of weak areas 21 can be arranged one-to-one corresponding to the plurality of battery cells 1 in the battery layer 10', or the plurality of battery cells 1 can correspond to the same weak area 21.

[0108] In some embodiments, only one weak area 21 may be provided on the first stopper 2 ′, and the weak area 21 may only cover a portion of the battery cells 1 , or cover all the battery cells 1 in the battery layer 10 ′.

[0109] In some embodiments, the weak area 21 covers at least two adjacent battery cells 1 along the first direction x, for example, the weak area 21 covers two, three or more adjacent battery cells 1. When the size of the battery cell 1 along the first direction x is small, such as a cylindrical battery, at least two adjacent battery cells 1 share a weak area 21, which can reduce the difficulty of processing and also help increase the pressure relief area of ​​the shell 11 when the battery cell 1 has thermal runaway. Moreover, for the embodiment in which the weak area 21 passes through the thickness direction of the first limiter 2' during pressure relief, at least two adjacent battery cells 1 share a channel for the discharge of emissions to the outside, which can achieve rapid discharge.

[0110] In some embodiments, Figures 2 to 4 As shown, in the second direction y, the size of the weak area 21 is smaller than the size of the housing 11, wherein the second direction y is perpendicular to the plane formed by the first direction x and the third direction z. This structure can provide a stable pressing force to the battery cell 1 in the area outside the weak area 21 while allowing the battery cell 1 to release pressure in the area corresponding to the weak area 21, so that the battery cell 1 can achieve stable pressure release.

[0111] In some embodiments, in the second direction y, the weak area 21 is provided in the middle area of ​​the shell 11. On the one hand, this structure enables the stopper 2 to reliably press the shell 11 at both ends along the second direction y, so that the battery cell 1 is depressurized in the middle area of ​​the shell 11, which can improve the stability of the pressure relief. On the other hand, in the second direction y, the middle area of ​​the shell 11 is less restrained by the end cover 12 and is easier to deform. Therefore, the weak area 21 is provided in correspondence with the middle area of ​​the shell 11 in the second direction y, which can make the area on the shell 11 corresponding to the weak area 21 easier to explode for pressure relief.

[0112] In some embodiments, Figures 2 to 4 As shown, the projection of the weak area 21 in the reference plane perpendicular to the third direction z is rectangular. This structural form is conducive to increasing the area of ​​the weak area 21, so as to increase the area of ​​the pressure relief area, ensure that the internal emissions of the battery cell 1 are discharged stably and smoothly, prevent instantaneous explosion and fire, and improve the safety of the battery 10 during operation. In some embodiments, the projection of the weak area 21 can also be circular, elliptical, triangular or other polygonal shapes.

[0113] In some embodiments, Figure 4 and Figure 5 As shown, there is a gap L between adjacent battery cells 1 in the same battery layer 10', and the gap L is connected to the weak area 21. For example, when the weak area 21 is a through hole 21', the gap L is connected to the through hole 21' to form an integral channel, so that the emissions generated by thermal runaway of the battery cell 1 can flow freely in the channel after breaking through the shell 11, so as to be quickly discharged from the battery 10. When the weak area 21 is a thickness reduction portion, the emissions generated by thermal runaway can reach the location of the weak area 21 through the gap L after breaking through the shell 11. Furthermore, the emissions can break through the thickness reduction portion to be quickly discharged from the battery 10.

[0114] The gap L in this embodiment forms a channel for the exhaust generated when the battery cell 1 is depressurized to be discharged to the outside, so as to achieve rapid pressure reduction and reduce the risk of chain reaction between adjacent battery cells 1 during thermal runaway.

[0115] In some embodiments, at least one limit member 2 is made of metal material, such as an aluminum limit member, to increase the rigidity of the limit member 2 and provide a reliable clamping force on the shell 11 of the battery cell 1, so that the battery cell 1 can stably release pressure through the area on the shell 11 corresponding to the weak area 21 when thermal runaway occurs.

[0116] like Figure 6As shown, an insulating film 3 is provided between each of the at least one stopper 2 and the adjacent battery cell 1 to insulate the stopper 2 from the battery cell 1. For example, the insulating film 3 may be a hot pressing film. This structure can ensure the insulation between the stopper 2 and the battery cell 1, prevent the battery cell 1 from short circuiting, and improve the reliability of the battery 10.

[0117] In some embodiments, Figure 5 and Figure 6 As shown, the battery cell 1 is cylindrical, and the axis of the battery cell 1 is consistent with the second direction y, and each of the at least one stopper 2 is provided with a recessed portion 22, and the recessed portion 22 is configured to accommodate the battery cell 1 to limit the movement of the battery cell 1 along the first direction x and the third direction z. If the battery layer 10' includes a plurality of battery cells 1, a plurality of recessed portions 22 are provided at intervals along the first direction x on the stopper 2 adjacent to the battery layer 10', and the plurality of recessed portions 22 are provided one-to-one correspondingly to the plurality of battery cells.

[0118] The limiting member 2 can be set as a corrugated plate by stamping or bending; or the concave portion 22 can be formed on the side surface of the limiting member 2 along the third direction z.

[0119] In some embodiments, in this embodiment, the movement of the battery cell 1 along the second direction y can be achieved by additionally setting a limiting structure at the end of the battery cell 1, or by limiting the movement of the battery cell 1 along the second direction y by the adhesive layer between the limiting member 2 and the battery cell 1, or by the pressing force of the limiting member 2 on the battery cell 1.

[0120] This embodiment can more reliably limit the movement of the battery cell 1 along the first direction x and the third direction z by providing a recessed portion 22 on the limiting member 2, so as to prevent the battery cell 1 from vibrating during operation and moving, and facilitate maintaining the gap L between adjacent battery cells 1 in the same battery layer 10' during assembly.

[0121] In some embodiments, Figure 7 and Figure 8 As shown, a pressure relief mechanism 111 is provided on the battery cell 1 , and the pressure relief mechanism 111 is configured to relieve pressure when the internal pressure of the battery cell 1 reaches a first threshold.

[0122] For example, the pressure relief mechanism 111 may be disposed on the housing 11 or the end cover 12 .

[0123] For example, the pressure relief mechanism 111 may be a notch provided on the inner or outer surface of the housing 11 or the end cover 12 to reduce the local thickness for easy pressure relief, such as Figure 8 As shown, the pressure relief mechanism 111 is disposed on the outer surface of the housing 11 ; alternatively, a region with a lower melting point is also disposed to form the pressure relief mechanism 111 .

[0124] This embodiment provides a pressure relief mechanism 111 on the battery cell 1. When the pressure relief mechanism 111 is provided on the end cover 12 or the shell 11 and is located outside the weak area 21, when the internal pressure of the battery cell 1 reaches a first threshold, pressure can be released simultaneously through the pressure relief mechanism 111 and the area on the shell 11 corresponding to the weak area 21, thereby increasing the total area of ​​the pressure relief channel and improving the pressure relief speed. When the pressure relief mechanism 111 is provided in the area on the shell 11 corresponding to the weak area 21, when the internal pressure of the battery cell 1 reaches the first threshold, the area on the shell 11 corresponding to the weak area 21 can be broken in a more controllable manner, thereby improving the pressure relief reliability.

[0125] In some embodiments, Figure 7 As shown, the area of ​​the weak area 21 is larger than the area of ​​the pressure relief mechanism 111. This embodiment enables the battery cell 1 to play a major pressure relief role through the area corresponding to the weak area 21 on the housing 11 when thermal runaway occurs, and the pressure relief mechanism 111 plays an auxiliary pressure relief role.

[0126] In some embodiments, Figure 7 As shown, the pressure relief mechanism 111 is disposed on the housing 11 , and the pressure relief mechanism 111 is disposed corresponding to the weak area 21 .

[0127] This embodiment can make the area on the shell 11 corresponding to the weak area 21 more easily ruptured for pressure relief when the internal pressure of the battery cell 1 reaches the first threshold, and make the pressure relief pressure more controllable, thereby improving the reliability of pressure relief.

[0128] In some specific embodiments, Figures 2 to 6 The battery 10 includes a plurality of battery layers 10' and a plurality of stoppers 2. The plurality of battery layers 10' are stacked along the third direction z. Each battery layer 10' includes a plurality of cylindrical battery cells 1 arranged side by side along the first direction x, and a gap L is maintained between adjacent battery cells 1. The axis of each battery cell 1 is consistent with the second direction y. The battery cell 1 includes a housing 11 and an end cover 12. The end cover 12 is provided with an electrode terminal 121 and a liquid injection hole 122.

[0129] Limiting members 2 are provided between adjacent battery layers 10' and on the outside of the outermost battery layer 10', and the multiple limiting members 2 are all first limiting members 2'. The limiting members 2 can use a wavy plate to form multiple recessed portions 22. The multiple recessed portions 22 are arranged one-to-one corresponding to the multiple battery cells 1 of the layer. Each battery layer 2 is restricted in movement along the third direction z by two adjacent limiting members 2, and the movement of the battery cells 1 along the first direction x is restricted by the recessed portions 22.

[0130] Each first stopper 2' is provided with a plurality of weak areas 21, and each battery cell 1 in the same battery layer 10' is covered by the weak area 21. The weak area 21 can be provided in the middle area of ​​the battery cell 1 along the second direction y. The weak area 21 can be provided as a through hole 21', for example, a rectangular through hole 21', and the through hole 21' can cover the housing 11 of at least two battery cells 1 along the first direction x. Figure 5 As shown, multiple battery cells 1 in adjacent battery layers 10' are staggered along the first direction x, which can reduce the thickness of the battery 10 along the third direction z and make the layout more compact. The weak areas 21 on adjacent first stoppers 2' can be arranged opposite each other in the first direction x, so that the discharge generated by the battery cells 1 in a certain battery layer 10' after pressure relief can directly pass through the gap L and reach the through hole 21' on the next first stopper 2' in a shorter path after being discharged from the through hole 21' at the corresponding position, which is conducive to the discharge of the discharge from the battery 10 through the through holes 21' on multiple first stoppers 2' in sequence. In some embodiments, the weak areas 21 on adjacent first stoppers 2' can also be staggered in the first direction x.

[0131] like Figure 7-Figure 8 As shown, a pressure relief mechanism 111 is provided at a position corresponding to the weak area 21 on the shell 11 of the battery cell 1, and the pressure relief mechanism 111 is configured to relieve pressure when the internal pressure of the battery cell 1 reaches a first threshold. For example, the pressure relief mechanism 111 is adapted to the shape of the weak area 21, and the area of ​​the pressure relief mechanism 111 may be smaller than the area of ​​the weak area 21. In some embodiments, the pressure relief mechanism 111 may also be provided on the end cover 12, on the shell 11 outside the weak area 21, or may be eliminated.

[0132] For example, the size of a cylindrical battery cell 1 is The projection size of the weak area 21 in the plane perpendicular to the third direction z is about 50*50 mm, and the gap L between adjacent battery cells 1 in the same battery layer 10 ′ is 6-8 mm.

[0133] Secondly, the present application provides a method for manufacturing a battery. In some embodiments, Fig. 9 As shown, the manufacturing method of the battery includes:

[0134] Step S110, assembling to form at least one battery layer 10', each battery layer 10' in the at least one battery layer 10' comprises a plurality of battery cells 1 arranged side by side along a first direction x, and each battery cell 1 in the plurality of battery cells 1 comprises a housing 11 and an end cover 12 connected to each other;

[0135] Step S120, providing at least one stopper 2, wherein the at least one stopper 2 includes a first stopper 2', wherein the first stopper 2' is provided with a weak area 21, and the weak area 21 is configured to release pressure from the battery cell 1 through an area of ​​the housing 11 corresponding to the weak area 21 when the internal pressure of the battery cell 1 reaches a first threshold;

[0136] Step S130, at least one limiting member 2 is disposed corresponding to at least one battery layer 10' and covers the shell 11 to limit the corresponding battery layer 10' from moving along a third direction z perpendicular to the first direction x, and the third direction z is perpendicular to at least one battery layer 10'.

[0137] There is no restriction on the execution order of steps S110 and S120 , and step S120 may be executed first, and then step S110 , and step S130 may be executed after steps S110 and S120 .

[0138] Finally, the present application also provides a battery manufacturing device 200. In some embodiments, as Fig.10 As shown, it includes: battery layer assembly equipment 210, limiter providing equipment 220 and battery assembly equipment 230. Among them:

[0139] The battery layer assembly equipment 210 is configured to assemble and form at least one battery layer 10', each battery layer 10' in the at least one battery layer 10' includes a plurality of battery cells 1 arranged side by side along a first direction x, and each battery cell 1 in the plurality of battery cells 1 includes a shell 11 and an end cover 12 that are connected to each other.

[0140] The limiting member providing device 220 is configured to provide at least one limiting member 2, wherein the at least one limiting member 2 includes a first limiting member 2', and a weak area 21 is provided on the first limiting member 2', so that when the internal pressure of the battery cell 1 reaches a first threshold, the battery cell 1 can release pressure through the area corresponding to the shell 11 and the weak area 21.

[0141] The battery assembly equipment 230 is configured such that at least one limit member 2 is arranged corresponding to at least one battery layer 10' and covers the shell 11 to limit the movement of the corresponding battery layer 10' along a third direction z perpendicular to the first direction x, and the third direction z is perpendicular to at least one battery layer 10'.

[0142] The battery manufacturing method and the battery manufacturing device 200 described above can enable the battery 10 to, when thermal runaway occurs,

[0143] The limiting effect of the first limiting member 2' on the shell 11 in the weak area 21 is smaller than that in other areas. The area corresponding to the shell 11 and the weak area 21 is ruptured first to release pressure, and the emissions generated by the pressure release can be discharged from the battery cell 1 through the area corresponding to the shell 11 and the weak area 21. This method of achieving pressure release through the shell 11 of the battery cell 1 is conducive to increasing the area of ​​the pressure release area, ensuring that the emissions inside the battery cell 1 are discharged stably and smoothly, preventing instantaneous explosion and fire, and improving the safety of the battery 10 during operation.

[0144] 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 (10), comprising: at least one battery layer (10'), each battery layer (10') of the at least one battery layer (10') comprising a plurality of battery cells (1) arranged side by side along a first direction (x), each battery cell (1) of the plurality of battery cells (1) comprising a housing (11) and an end cover (12) connected to each other; and At least one limiting member (2) is arranged corresponding to the at least one battery layer (10') and covers the shell (11) to limit the movement of the corresponding battery layer (10') along a third direction (z), the third direction (z) being perpendicular to the at least one battery layer (10'), the at least one limiting member (2) comprising a first limiting member (2'), the first limiting member (2') being provided with a weak area (21), the weak area (21) being configured to release pressure from the battery cell (1) through an area of ​​the shell (11) corresponding to the weak area (21) when the internal pressure of the battery cell (1) reaches a first threshold; The battery cell (1) is cylindrical, and each of the at least one limiting member (2) is provided with a recessed portion (22), wherein the recessed portion (22) is configured to accommodate the battery cell (1) so as to limit the movement of the battery cell (1) along the first direction (x) and the third direction (z).

2. The battery (10) according to claim 1, comprising a plurality of battery layers (10') stacked along the third direction (z), wherein the first limiting member (2') is disposed between two adjacent battery layers (10').

3. The battery (10) according to claim 1, wherein: The weak area (21) is configured to form a channel for the exhaust of the battery cell (1) to be discharged outward when the battery cell (1) is depressurized.

4. The battery (10) according to claim 1, wherein: The at least one limiting member (2) is the first limiting member (2'), and each of the first limiting members (2') is provided with the weak area (21) at the position where each of the battery cells (1) is located in the corresponding battery layer (10').

5. The battery (10) according to claim 1, wherein: A plurality of the weak areas (21) are arranged on the first limiting member (2') at intervals along the first direction (x).

6. The battery (10) according to any one of claims 1 to 5, wherein: The weak area (21) covers at least two adjacent battery cells (1) along the first direction (x).

7. The battery (10) according to any one of claims 1 to 5, wherein: In a second direction (y), a size of the weak area (21) is smaller than a size of the shell (11), wherein the second direction (y) is perpendicular to a plane formed by the first direction (x) and the third direction (z).

8. The battery (10) according to claim 7, wherein: In the second direction (y), the weak area (21) is arranged in a middle area of ​​the shell (11).

9. The battery (10) according to any one of claims 1 to 5, wherein: The projection of the weak area (21) in a reference plane perpendicular to the third direction (z) is rectangular.

10. The battery (10) according to any one of claims 1 to 5, wherein: The weak area (21) comprises at least one of a through hole (21') and a reduced thickness portion.

11. The battery (10) according to any one of claims 1 to 5, wherein: There is a gap (L) between adjacent battery cells (1) in the same battery layer (10'), and the gap (L) is connected to the weak area (21).

12. The battery (10) according to any one of claims 1 to 5, wherein: The battery cell (1) is provided with a pressure relief mechanism (111), and the pressure relief mechanism (111) is configured to relieve pressure when the internal pressure of the battery cell (1) reaches the first threshold value.

13. The battery (10) according to claim 12, wherein: The area of ​​the weak zone (21) is larger than the area of ​​the pressure relief mechanism (111).

14. The battery (10) according to claim 12, wherein: The pressure relief mechanism (111) is provided on the housing (11), and the pressure relief mechanism (111) is provided corresponding to the weak area (21).

15. The battery (10) according to any one of claims 1 to 5, wherein: The at least one limiting member (2) is made of metal material.

16. The battery (10) according to claim 15, wherein: An insulating film (3) is provided between each of the at least one limiting member (2) and the adjacent battery cell (1), so as to insulate the limiting member (2) from the battery cell (1).

17. An electrical device, comprising the battery (10) according to any one of claims 1 to 16, wherein the battery (10) is configured to provide electrical energy to the electrical device.

18. A method for manufacturing a battery, comprising: Assembling to form at least one battery layer (10'), each battery layer (10') in the at least one battery layer (10') comprising a plurality of battery cells (1) arranged side by side along a first direction (x), each battery cell (1) in the plurality of battery cells (1) comprising a housing (11) and an end cover (12) connected to each other; At least one limiting member (2) is provided, the at least one limiting member (2) comprising a first limiting member (2'), the first limiting member (2') being provided with a weak area (21), the weak area (21) being configured to release pressure from the battery cell (1) through an area of ​​the housing (11) corresponding to the weak area (21) when the internal pressure of the battery cell (1) reaches a first threshold; The at least one limiting member (2) is arranged corresponding to the at least one battery layer (10') and covers the housing (11) to limit the movement of the corresponding battery layer (10') along a third direction (z) perpendicular to the first direction (x), wherein the third direction (z) is perpendicular to the at least one battery layer (10'); The battery cell (1) is cylindrical, and each of the at least one limiting member (2) is provided with a recessed portion (22), wherein the recessed portion (22) is configured to accommodate the battery cell (1) so as to limit the movement of the battery cell (1) along the first direction (x) and the third direction (z).

19. A battery manufacturing device (200), comprising: A battery layer assembly device (210) is configured to assemble and form at least one battery layer (10'), each battery layer (10') in the at least one battery layer (10') comprising a plurality of battery cells (1) arranged side by side along a first direction (x), each battery cell (1) in the plurality of battery cells (1) comprising a housing (11) and an end cover (12) connected to each other; A position-limiting member providing device (220) is configured to provide at least one position-limiting member (2), the at least one position-limiting member (2) comprising a first position-limiting member (2'), the first position-limiting member (2') being provided with a weak area (21) so that when the internal pressure of the battery cell (1) reaches a first threshold, the battery cell (1) is depressurized through an area of ​​the housing (11) corresponding to the weak area (21); and A battery assembly device (230) configured such that the at least one stopper (2) is arranged corresponding to the at least one battery layer (10') and covers the housing (11) to limit the movement of the corresponding battery layer (10') along a third direction (z) perpendicular to the first direction (x), wherein the third direction (z) is perpendicular to the at least one battery layer (10'); The battery cell (1) is cylindrical, and each of the at least one limiting member (2) is provided with a recessed portion (22), wherein the recessed portion (22) is configured to accommodate the battery cell (1) so as to limit the movement of the battery cell (1) along the first direction (x) and the third direction (z).

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