Battery, electrical device, method for preparing battery, and device for preparing battery

Abstract

Provided are a battery, an electrical device, and a method and device for preparing a battery. The battery includes: a first battery cell and a second battery cell, the pressure relief mechanism of the first battery cell and the pressure relief mechanism of the second battery cell are arranged opposite to each other along a first direction; a box body for accommodating the first battery cell and the second battery cell; and a partition component for separating the first battery cell and the second battery cell in the first direction, the partition component including a first wall and a second wall arranged opposite to each other, the first wall being provided with a first through hole, the second wall being provided with a second through hole, a first protective member attached to the first wall, the first protective member having a first weak portion arranged opposite to the first through hole, and a second protective member attached to the second wall, the second protective member having a second weak portion arranged opposite to the second through hole, wherein, in a cross section perpendicular to the first direction, the area of ​​the first weak portion is larger than the first through hole, and the area of ​​the second weak portion is larger than the second through hole.

Description

Technical Field

[0001] The present application relates to the field of energy storage devices, and more particularly, to a battery, an electrical device, a method for preparing a battery, and a device for preparing a battery. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of the industry's sustainable development. Battery technology, in turn, is a crucial factor in the development of electric vehicles.

[0003] With the continuous development of battery technology, higher requirements are placed on battery performance, and it is hoped that the battery can take multiple design factors into consideration at the same time. Summary of the Invention

[0004] The present application provides a battery, an electrical device, a method for preparing a battery, and an apparatus for preparing a battery to improve the safety of the battery.

[0005] In a first aspect, a battery is provided, comprising: a first battery cell and a second battery cell, the pressure relief mechanism of the first battery cell and the pressure relief mechanism of the second battery cell being arranged opposite to each other along a first direction; a box body for accommodating the first battery cell and the second battery cell; and a partition component for separating the first battery cell and the second battery cell in the first direction, the partition component comprising a first wall and a second wall arranged opposite to each other, the first wall being provided with a first through hole, the second wall being provided with a second through hole, the first through hole being used to guide the discharge discharged from the pressure relief mechanism of the first battery cell, the second through hole being used to guide the discharge discharged from the pressure relief mechanism of the second battery cell, a first protective member being attached to the first wall, the first protective member having a first weak portion arranged opposite to the first through hole, a second protective member being attached to the second wall, the second protective member having a second weak portion arranged opposite to the second through hole, wherein, in a cross section perpendicular to the first direction, the area of ​​the first weak portion is larger than the first through hole, and the area of ​​the second weak portion is larger than the second through hole.

[0006] In batteries, when a battery cell experiences thermal runaway or damage, high-temperature, high-pressure emissions are released from the cell's pressure relief mechanism. If the pressure relief mechanism is located between two adjacent battery cells, the heat generated by the thermally runaway cell can be further transferred to the other cell located opposite it, causing thermal runaway to spread and potentially cause severe thermal runaway, even fires and explosions.

[0007] The technical solution of the present application is to set a partition component between the first battery cell and the second battery cell in the first direction in which the pressure relief mechanisms of the first battery cell and the second battery cell are relatively arranged, so that the partition component can be used to achieve heat insulation and fire protection when thermal runaway occurs in the battery cell. Moreover, the first through hole and the second through hole are used to guide the emissions ejected from the adjacent pressure relief mechanisms into the interior of the partition component, so that the emissions can be easily guided to be discharged. Furthermore, the structure of the first protective component and the second protective component mentioned above can prevent the emissions entering the partition component from the first through hole from reaching the second battery cell via the second through hole, and prevent the emissions entering the partition component from the second through hole from reaching the first battery cell via the first through hole. This prevents the above-mentioned problem of thermal runaway diffusion from occurring.

[0008] In some embodiments, the first protective member is positioned in close contact with the first wall, and the second protective member is positioned in close contact with the second wall. This allows, for example, for emissions entering the partition through the first through-hole to impact the second protective member, allowing the second protective member to be supported by the closely attached second wall, further ensuring the structural rigidity of the second protective member. This prevents emissions entering through the first through-hole from breaking through the second protective member and reaching the second battery cell. The same applies to the first protective member.

[0009] In some embodiments, the first weak portion is provided by forming a notch in the first protective member or configuring the thickness of the first weak portion to be thinner than other portions of the first protective member, and the second weak portion is provided by forming a notch in the second protective member or configuring the thickness of the second weak portion to be thinner than other portions of the second protective member. By forming the first weak portion in this way, the emissions ejected from the pressure relief mechanism of the first battery cell can impact the first weak portion from the first through hole, which is smaller than the area of ​​the first weak portion, and open it, so that it can enter the partition component. Since the second weak portion is larger than the area of ​​the second through hole, the emissions entering from the first through hole will not break open the second weak portion, thereby preventing the emissions entering from the first through hole from causing adverse effects on the second battery cell and preventing the spread of thermal runaway. The function of the second weak portion is the same.

[0010] In some embodiments, along the first direction, the projection of the first weak portion covers the projection of the first through hole, and the projection of the second weak portion covers the projection of the second through hole, thereby further ensuring that the first weak portion and the second weak portion will not be partially damaged.

[0011] In some embodiments, the housing has an upper cover and a housing shell connected in a second direction, and the first and second battery cells are accommodated in the space enclosed by the upper cover and the housing shell. The second direction is orthogonal to the first direction, and the partition member is sealed to the upper cover and the housing shell. In some embodiments, the first wall, the second wall, the upper cover, and the housing shell together surround and form an exhaust passage for the flow of the exhaust. In order to prevent the exhaust entering the space within the partition member from the first through hole and the second through hole from flowing along the exhaust passage and leaking out of the partition member again, the partition member is sealed from the upper cover and the housing shell. This sealing can be achieved, for example, by applying a sealant or providing a sealing liner.

[0012] In some embodiments, an exhaust member is formed in the housing at a position opposite the outlet of the exhaust duct. The exhaust member is used to discharge the exhaust flowing in the exhaust duct to the exterior of the housing. The exhaust duct, formed by the first wall, second wall, upper cover, and housing, has an outlet along its extension direction, and the exhaust member is disposed in the housing at a position opposite the outlet. This allows the exhaust that reaches the outlet through the exhaust duct to be efficiently discharged outside the housing.

[0013] In some embodiments, the partition member further includes a connecting member for connecting the first wall and the second wall. This can enhance the rigidity of the partition member as a whole. The partition member can also be formed integrally.

[0014] In some embodiments, the housing has an upper cover and a housing shell connected in a second direction, the second direction being orthogonal to the first direction. Connecting members are formed at both the top and bottom of the partition member in the second direction, with the top connecting member being sealed to the upper cover, and the bottom connecting member being sealed to the housing shell. That is, the partition member is formed in a square shape. Compared to a case where no top or bottom connecting member is formed, the area of ​​the sealed connection is increased, thereby enhancing not only the overall rigidity of the partition member but also the sealing performance.

[0015] In some embodiments, the partition component further includes: a first support member for supporting the first protective member; and a second support member for supporting the second protective member. In some embodiments, the first support member is connected to the first wall, and the second support member is connected to the second wall. Thus, even if the partition component only has the first and second walls without a connecting component, the first and second support members of the partition component can be used to stably support the first and second protective members, ensuring the structural stability of the first and second protective members.

[0016] In some embodiments, the partition component further includes: a first support member for supporting the first protective member; and a second support member for supporting the second protective member. The first support member is connected to the first wall and / or the connecting member, and the second support member is connected to the second wall and / or the connecting member. Thus, when the partition component has a first wall, a second wall, and a connecting member, the first and second support members provided on the partition component and / or the connecting member can be used to stably support the first and second protective members, thereby ensuring the structural stability of the first and second protective members.

[0017] In some embodiments, a slot is formed between the first wall and the first support member for the first guard member to slide, thereby positioning the first guard member. A slot is formed between the second wall and the second support member for the second guard member to slide, thereby positioning the second guard member. Thus, during installation, the first and second guard members can slide along the slots to the appropriate installation positions, thereby improving positioning accuracy. Furthermore, even when the partition member is long along its extension direction, the first and second guard members can be properly positioned.

[0018] In some embodiments, the first and second protective members are connected via a protective connector. This improves the rigidity of the first and second protective members. In some embodiments, the first protective member, the protective connector, and the second protective member are integrally formed. This facilitates processing and improves productivity.

[0019] In a second aspect, an electrical device is provided, comprising: the battery according to the first aspect. The battery is used to provide electrical energy.

[0020] In a third aspect, a method for preparing a battery is provided, comprising: providing a first battery cell and a second battery cell, the pressure relief mechanism of the first battery cell and the pressure relief mechanism of the second battery cell being arranged opposite to each other along a first direction; providing a box body, the box body accommodating the first battery cell and the second battery cell; providing a partition component, the partition component being used to separate the first battery cell and the second battery cell in the first direction, the partition component comprising a first wall and a second wall being arranged opposite to each other, the first wall being provided with a first through hole, the second wall being provided with a second through hole, the first through hole being used to guide the discharge discharged from the pressure relief mechanism of the first battery cell, and the second through hole being used to guide the discharge discharged from the pressure relief mechanism of the second battery cell; providing a first protective member, the first protective member being attached to the first wall, the first protective member having a first weak portion arranged opposite to the first through hole; and providing a second protective member, the second protective member being attached to the second wall, the second protective member having a second weak portion arranged opposite to the second through hole, wherein, in a cross section perpendicular to the first direction, the area of ​​the first weak portion is larger than the first through hole, and the area of ​​the second weak portion is larger than the second through hole.

[0021] In a fourth aspect, a device for preparing a battery is provided, comprising: a first providing module for providing a first battery cell and a second battery cell, the pressure relief mechanism of the first battery cell and the pressure relief mechanism of the second battery cell being arranged opposite to each other along a first direction; a second providing module for providing a box body, the box body accommodating the first battery cell and the second battery cell; a third providing module for providing a partition component, the partition component being used to separate the first battery cell and the second battery cell in the first direction, the partition component comprising a first wall and a second wall arranged opposite to each other, the first wall being provided with a first through hole, the second wall being provided with a second through hole, the first through hole being used to guide the discharge discharged from the pressure relief mechanism of the first battery cell, and the second through hole being used to guide the discharge discharged from the pressure relief mechanism of the second battery cell Emissions discharged by the pressure relief mechanism of the battery cell; a fourth providing module for providing a first protective member, the first protective member having a first weak portion; and a fifth providing module for providing a second protective member, the second protective member having a second weak portion; an installation module, attaching the first protective member to the first wall so that the first weak portion of the first protective member is arranged opposite to the first through hole, attaching the second protective member to the second wall so that the second weak portion of the second protective member is arranged opposite to the second through hole, and installing the partition component and the battery cell to the box body, wherein, in a cross-section perpendicular to the first direction, the area of ​​the first weak portion is larger than the first through hole, and the area of ​​the second weak portion is larger than the second through hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A schematic diagram of a vehicle according to an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of a battery according to one embodiment of the present application;

[0025] FIG3( a ) is a perspective schematic diagram of the structure of two battery cells and a partition member located between the two battery cells;

[0026] FIG3( b ) is a perspective view of the structure of the partition member in FIG3( a ) as viewed from the second wall side;

[0027] FIG4( a ) is a cross-sectional view taken along line II of FIG3( a );

[0028] FIG4( b ) is a schematic diagram showing the dimensional relationship between the projections of the first through hole and the first weak portion along the first direction;

[0029] FIG5( a ) is a schematic structural diagram of an exhaust passage when the partition member is composed of a first wall and a second wall;

[0030] FIG5( b ) is a schematic structural diagram of the partition component in FIG5( a );

[0031] Figure 6 Another embodiment of the structure of the partition member;

[0032] Figure 7 A further embodiment of the structure of the partition member;

[0033] Figure 8 A schematic flow chart of a method for preparing a battery according to one embodiment of the present application;

[0034] Figure 9 A schematic block diagram of an apparatus for preparing a battery according to one embodiment of the present application. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0037] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0039] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0040] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0041] The battery mentioned in the embodiments of this application refers to a single physical module including multiple battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack.

[0042] A battery cell comprises an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises 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 current collector uncoated with the positive active material layer protrudes from the current collector coated with the positive active material layer, and the current collector uncoated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises 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 current collector uncoated with the negative active material layer protrudes from the current collector coated with the negative active material layer, and the current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure high current flow without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of PP or PE, among other materials. Furthermore, the electrode assembly can be a wound or laminated structure, although the present invention is not limited thereto.

[0043] The development of battery technology must take into account multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery safety must also be considered.

[0044] Currently, electric vehicle batteries often require dozens or even thousands of battery cells. When a battery cell experiences thermal runaway or damage, it can release high-temperature, high-pressure emissions through the cell's pressure relief mechanism. If the pressure relief mechanism is located between two adjacent battery cells, the heat generated by the thermally runaway cell can be further transferred to the opposite cell, causing thermal runaway to spread and potentially cause serious thermal runaway, even fires and explosions.

[0045] In view of this, the present application provides a technical solution, a battery comprising: a first battery cell and a second battery cell, the pressure relief mechanism of the first battery cell and the pressure relief mechanism of the second battery cell being arranged opposite to each other along a first direction; a box body for accommodating the first battery cell and the second battery cell; and a partition component for separating the first battery cell and the second battery cell in the first direction, the partition component comprising a first wall and a second wall arranged opposite to each other, the first wall being provided with a first through hole, the second wall being provided with a second through hole, the first through hole being used to guide the discharge discharged from the pressure relief mechanism of the first battery cell, the second through hole being used to guide the discharge discharged from the pressure relief mechanism of the second battery cell, a first protective member being attached to the first wall, the first protective member having a first weak portion arranged opposite to the first through hole, a second protective member being attached to the second wall, the second protective member having a second weak portion arranged opposite to the second through hole, wherein, in a cross section perpendicular to the first direction, the area of ​​the first weak portion is larger than the first through hole, and the area of ​​the second weak portion is larger than the second through hole.

[0046] By providing a partition component between the first battery cell and the second battery cell in the first direction in which the pressure relief mechanisms of the first battery cell and the second battery cell are relatively arranged, the partition component can be used to achieve heat insulation and fire protection when thermal runaway occurs in the battery cell. Moreover, the first through hole and the second through hole can be used to guide the emissions ejected from the adjacent pressure relief mechanisms into the interior of the partition component, and the exhaust can also be discharged from the end of the partition component, thereby easily guiding the emissions to be discharged, thereby improving the overall safety of the battery. Furthermore, the structure of the first protective member and the second protective member described above can prevent emissions entering the partition component from the first through hole from reaching the second battery cell via the second through hole, and emissions entering the partition component from the second through hole from reaching the first battery cell via the first through hole. This prevents the problem of thermal runaway diffusion.

[0047] An embodiment of the present application provides an electrical device, wherein a battery is used to provide electrical energy.

[0048] The technical solutions described in the embodiments of the present application are applicable to various battery-using devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0049] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0050] For example, Figure 1 As shown, it is a structural schematic diagram of a vehicle 100 according to an embodiment of the present application. The vehicle 100 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 2, a controller 3 and a battery 1 can be provided inside the vehicle 100. The controller 3 is used to control the battery 1 to supply power to the motor 2. For example, a battery 1 can be provided at the bottom, front or rear of the vehicle 100. The battery 1 can be used to power the vehicle 100. For example, the battery 1 can be used as an operating power source for the vehicle 100, for the circuit system of the vehicle 100, for example, for the working power requirements of the vehicle 100 during startup, navigation and operation. In another embodiment of the present application, the battery 1 can not only be used as an operating power source for the vehicle 100, but also as a driving power source for the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0051] In order to meet different power requirements, the battery 1 may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series and parallel connection.

[0052] For example, Figure 2 The figure shows a schematic diagram of the three-dimensional structure of a battery 1 according to an embodiment of the present application. The battery 1 includes a box body 50, the interior of the box body 50 is a hollow structure, and a battery cell 10' is accommodated in the box body 50. Figure 2 As shown, the box body 50 may include two parts, which are respectively referred to as the upper cover 51 and the box shell 52. The upper cover 51 and the box shell 52 are buckled together. The shape of the upper cover 51 and the box shell 52 may be determined according to the shape of the combination of multiple battery cells 10'. For example, the upper cover 51 and the box shell 52 may both be hollow rectangular parallelepipeds and each may have only one open face, the opening of the upper cover 51 and the opening of the box shell 52 may be arranged relative to each other, and the upper cover 51 and the box shell 52 may be buckled together to form a box body 50 with a closed chamber. The upper cover 51 may also be a rectangular parallelepiped with an opening and the box shell 52 may be plate-shaped, or the box shell 52 may be a rectangular parallelepiped with an opening and the upper cover 51 may be plate-shaped, and the upper cover 51 and the box shell 52 may be arranged relative to each other and buckled to form a box body 50 with a closed chamber.

[0053] like Figure 2As shown, a plurality of battery cells 10' are housed in the box 50, and the plurality of battery cells 10' can be arranged along a first direction X and a third direction Y, wherein the first direction X is orthogonal to the third direction Y. That is, the plurality of battery cells 10' in the battery 1 can be arranged in a matrix structure. The plurality of battery cells 10' are connected in parallel, in series, or in a mixed combination, and are placed in the box 20 formed by the upper cover 21 and the box shell 22 being fastened together. Optionally, the battery 1 can also have only two battery cells 10', and the pressure relief mechanisms of the two battery cells 10' are arranged relative to each other in the first direction X.

[0054] Figure 3(a) shows a perspective schematic diagram of a structure in which the pressure relief mechanisms of two battery cells 10' are arranged opposite each other in the first direction X, with a partition member 30 disposed between the two battery cells 10'. Figure 3(b) shows a perspective schematic diagram of the partition member 30 in Figure 3(a) as viewed from the second wall 32. Figure 4(a) is a cross-sectional view taken along line II of Figure 3(a). Figure 4(b) is a schematic diagram illustrating the dimensional relationship between the projections of the first through-hole 33 and the first weakened portion 42 along the first direction X.

[0055] Figures 3(a) and 3(b) illustrate a battery 1 having a first battery cell 10 and a second battery cell 20. The first pressure relief mechanism 11 of the first battery cell 10 and the second pressure relief mechanism 21 of the second battery cell 20 are arranged opposite each other along a first direction X. A partition member 30 is located between the first battery cell 10 and the second battery cell 20 in the first direction X, separating the first battery cell 10 from the second battery cell 20. The partition member 30 includes a first wall 31 and a second wall 32 disposed opposite each other. The first wall 31 is provided with a first through-hole 33, and the second wall 32 is provided with a second through-hole 34. The first through-hole 33 is used to guide exhaust from the first pressure relief mechanism 11 into the space within the partition member 30, and the second through-hole 34 is used to guide exhaust from the second pressure relief mechanism 21 into the space within the partition member 30. A first protective member 40 is attached to the first wall 31. The first protective member 40 has a first weakened portion 42 disposed opposite the first through-hole 33. A second protective member 41 is attached to the second wall 32 and has a second weak portion 43 disposed opposite the second through hole 34. In a cross section perpendicular to the first direction X, the first weak portion 42 has a larger area than the first through hole 33, and the second weak portion 43 has a larger area than the second through hole 34.

[0056] Thus, by providing the separator 30 between the first battery cell 10 and the second battery cell 20, the separator 30 can provide thermal insulation and fire protection when thermal runaway occurs in the first battery cell 10 or the second battery cell 20. The first through-hole 33 and the second through-hole 34 direct the exhaust ejected from the first pressure relief mechanism 11 or the second pressure relief mechanism 21 into the space within the separator 30, thereby facilitating exhaust gas flow. Furthermore, because the area of ​​the first weak portion 42 is larger than that of the first through-hole 33, and the area of ​​the second weak portion 43 is larger than that of the second through-hole 34 in a cross-section perpendicular to the first direction X, exhaust entering the separator 30 from the first through-hole 33 is prevented from reaching the second battery cell 20 via the second through-hole 34, and exhaust entering the separator 30 from the second through-hole 34 is prevented from reaching the first battery cell 10 via the first through-hole 33, thereby preventing thermal runaway from spreading.

[0057] The pressure relief mechanism (such as the first pressure relief mechanism 11 and the second pressure relief mechanism 21) 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 10' 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 10'. 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 a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the first battery cell 10 and / or the second battery cell 20 reaches a predetermined threshold, the first pressure relief mechanism 11 and / or the second pressure relief mechanism 12 performs an action or the weak structure provided in the first pressure relief mechanism 11 and / or the second pressure relief mechanism 12 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0058] The "activation" mentioned in this application refers to the action of the pressure relief mechanism or its activation to a certain state, so that the internal pressure and temperature of the battery cell 10' can be released. The action produced by the first pressure relief mechanism 11 and / or the second pressure relief mechanism 12 may include but is not limited to: at least a part of the first pressure relief mechanism 11 and / or the second pressure relief mechanism 12 is broken, shattered, torn or opened, etc. When the first pressure relief mechanism 11 and / or the second pressure relief mechanism 12 is actuated, the high-temperature and high-pressure substances inside the battery cell 10' will be discharged outward from the actuated part as emissions. In this way, the first battery cell 10 and / or the second battery cell 20 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

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

[0060] Regarding the dimensional relationship between the first weak portion 42 and the first through hole 33, and between the second weak portion 43 and the second through hole 34, as shown in FIG4(b), preferably, along the first direction X, the projection of the first weak portion 42 overlaps the projection of the first through hole 33, and preferably, the projection of the second weak portion 43 overlaps the projection of the second through hole 34. This further ensures that the first weak portion 42 will not partially open due to the impact of the discharge ejected from the second pressure relief mechanism 12 of the second battery cell 20, and that the second weak portion 43 will not partially open due to the impact of the discharge ejected from the first pressure relief mechanism 11 of the first battery cell 10.

[0061] Here, a "weak portion" refers to a portion that is easily damaged when impacted. For example, the first weak portion 42 is provided by forming a notch in the first protective member 40 or by configuring the thickness of the first weak portion 42 to be thinner than the rest of the first protective member 40. The second weak portion 43 is provided by forming a notch in the second protective member 41 or by configuring the thickness of the second weak portion 43 to be thinner than the rest of the second protective member 41. As a result, the exhaust ejected from the first pressure relief mechanism 11 can impact the first weak portion 42 through the first through hole 33 and enter the space within the partition member 30. The exhaust ejected from the second pressure relief mechanism 21 can impact the second weak portion 43 through the second through hole 34 and enter the space within the partition member 30.

[0062] In addition, FIG4(b) shows that both the first through hole 33 and the first weak portion 42 are circular, but the present application is not limited to this. The first through hole 33 and the first weak portion 42 may also be shapes other than circular, such as rectangular, square, pentagonal, elliptical, etc. FIG4(b) only shows the dimensional relationship between the first through hole 33 and the first weak portion 42, but the dimensional relationship between the second through hole 34 and the second weak portion 43 is the same.

[0063] As shown in Figures 3(a), 3(b), and 4(a), the first protective member 40 is disposed in close contact with the first wall 31, and the second protective member 41 is disposed in close contact with the second wall 32. By minimizing the distance between the first protective member 40 and the first wall 31 in the first direction X, and minimizing the distance between the second protective member 41 and the second wall 32 in the first direction X, the first protective member 40 can be supported by the closely contacting first wall 31, and the second protective member 41 can be supported by the closely contacting second wall 32. Thus, for example, when emissions entering the partition member 30 from the first through-hole 33 impact the second protective member 41, the second wall 32 can support the second protective member 41, ensuring the structural rigidity of the second protective member 41, so that emissions entering from the first through-hole 33 will not break through the second weak portion 43 and reach the second battery cell 20. The same applies to the first protective member 40. That is, when the emissions entering the partition component 30 from the second through hole 34 impact the first protective member 40, the first wall 31 can support the first protective member 40, ensuring the structural rigidity of the first protective member 40, so that the emissions entering from the second through hole 34 will not break through the first weak portion 42 and reach the first battery cell 10.

[0064] FIG3( b ) and FIG4( a ) show a structure in which the partition member 30 includes a first wall 31, a second wall 32, and a connecting member 35. The connecting member 35 connects the first wall 31 and the second wall 32. This structure enhances the rigidity of the partition member 30 as a whole and allows the partition member 30 to be integrally formed, thereby improving productivity.

[0065] However, the present application is not limited to this. The partition member 30 may also comprise only the first wall 31 and the second wall 32. Figure 5(a) shows a schematic diagram of the structure of the exhaust passage 60 when the partition member 30 comprises the first wall 31 and the second wall 32, omitting the through-holes and weak portions. Figure 5(b) shows a schematic diagram of the structure of the partition member 30 in Figure 5(a).

[0066] As shown in FIG5(a), the box body 50 has an upper cover 51 and a box shell 52 connected in the second direction Z. The first wall 31, the second wall 32, the upper cover 51 and the box shell 52 together surround and form an exhaust channel 60 for the flow of exhaust gases. In order to prevent the exhaust gases entering the space inside the partition member 30 from the first through hole 33 and the second through hole 34 from flowing along the exhaust channel 60 and leaking out of the partition member 30 again, the partition member 30 is sealed with the upper cover 51 and the box shell 52. This sealing can be achieved, for example, by applying a sealant or providing a sealing liner (not shown). In addition, Figure 2, an exhaust member 70 is formed at a position of the housing 50 opposite to the outlet of the exhaust duct 60. The exhaust member 70 is used to discharge exhaust flowing in the exhaust duct 60 to the outside of the housing 50. Thus, exhaust reaching the outlet through the exhaust duct 60 can be efficiently discharged to the outside of the housing 50, thereby improving the overall safety of the battery 1.

[0067] Furthermore, as shown in FIG5(a), the partition member 30 further includes a first support member 36 for supporting the first guard member 40, and a second support member 37 for supporting the second guard member 41. The first support member 36 is connected to the first wall 31, and the second support member 37 is connected to the second wall 32. Thus, the first and second guard members 40, 41 can be stably supported by the first and second support members 36, 37 of the partition member 30.

[0068] As shown in FIG5(b), in the partition member 30, a groove 38 for sliding the first protective member 40 is formed between the first wall 31 and the first support member 36, for positioning the first protective member 40, and a groove 38 for sliding the second protective member 41 is formed between the second wall 32 and the second support member 37, for positioning the second protective member 41. As a result, during installation, the first protective member 40 and the second protective member 41 can be slid along the grooves 38 to the appropriate installation positions, respectively, which can improve positioning accuracy. Furthermore, when the partition member 30 is long along its extension direction, i.e., the third direction Y, the first protective member 40 and the second protective member 41 can also be well placed in the appropriate installation positions.

[0069] like Figure 6 FIG. 1 shows another embodiment of the structure of the partition member 30 .

[0070] In the present application, the partition member 30 may include a connecting member 35, which is used to connect the first wall 31 and the second wall 32. As long as the connecting member 35 can connect the first wall 31 and the second wall 32 and avoid the first through hole 33, the second through hole 34, the first protective member 40, and the second protective member 41, its location in the second direction Z is not particularly limited. For example, Figure 6 As shown, connecting members 35 are formed at both the top and bottom of the partition member 30 in the second direction Z. The top connecting member 35 is sealedly connected to the upper cover 51, and the bottom connecting member 35 is sealedly connected to the box shell 52. In other words, the partition member 30 is formed in a square shape. Compared to the case shown in FIG5( a ) without the top and bottom connecting members 35 , the area of ​​the sealed connection is larger, which not only enhances the overall rigidity of the partition member 30 but also improves the sealing performance.

[0071] exist Figure 6In the embodiment, the partition member 30 further includes a first support member 36 for supporting the first protective member 40 and a second support member 37 for supporting the second protective member 41. The first support member 36 and the second support member 37 are both connected to the bottom connecting member 35. The arrangement positions of the first support member 36 and the second support member 37 are not limited thereto; the first support member 36 may be connected to the first wall 31 and / or the connecting member 35, and the second support member 37 may be connected to the second wall 32 and / or the connecting member 35.

[0072] like Figure 6 As shown, in order to improve the rigidity of the first protective member 40 and the second protective member 41, the first protective member 40 and the second protective member 41 can be connected via a protective connector 44. In this case, the first protective member 40, the protective connector 44 and the second protective member 41 can be formed integrally, thereby facilitating processing and improving productivity.

[0073] like Figure 7 FIG. 2 shows another embodiment of the structure of the partition member 30, in which the first support member 36 and the second support member 37 are not formed. The partition member 30 is formed with connecting members 35 at the top and bottom, respectively, forming an overall U-shaped structure. The first protective member 40 and the second protective member 41 are connected by a protective connecting member 44 at the top and a protective connecting member 44 at the bottom. When this structure is adopted, the first protective member 40, the second protective member 41, and the protective connecting member 44 can be fixed to the inner surfaces of the partition member 30 by bonding, etc.

[0074] An embodiment of the present application further provides an electrical device, which may include the battery 1 in the aforementioned embodiments. The battery 1 is used in the electrical device to provide electrical energy.

[0075] The above describes the battery and electrical device of the embodiments of the present application. The following describes the method and device for preparing the battery of the embodiments of the present application. For the parts not described in detail, please refer to the aforementioned embodiments.

[0076] Figure 8 FIG. 4 is a schematic flow chart of a method 400 for preparing a battery according to an embodiment of the present application. Figure 8 As shown, the method 400 may include:

[0077] 410 , providing a first battery cell 10 and a second battery cell 20 , wherein the pressure relief mechanism of the first battery cell 10 and the pressure relief mechanism of the second battery cell 20 are arranged opposite to each other along a first direction X;

[0078] 420 , providing a box 50 , the box 50 accommodating the first battery cell 10 and the second battery cell 20 ;

[0079] 430, providing a partition member 30, the partition member 30 is used to separate the first battery cell 10 and the second battery cell 20 in the first direction X, the partition member 30 includes a first wall 31 and a second wall 32 arranged opposite to each other, the first wall 31 is provided with a first through hole 33, and the second wall 32 is provided with a second through hole 34, the first through hole 33 is used to guide the exhaust discharged from the pressure relief mechanism of the first battery cell 10, and the second through hole 34 is used to guide the exhaust discharged from the pressure relief mechanism of the second battery cell 20;

[0080] 440 , providing a first protective member 40 , the first protective member 40 being attached to the first wall 31 , the first protective member 40 having a first weak portion 42 disposed opposite to the first through hole 31 ; and

[0081] 450, providing a second protective member 41, the second protective member 41 is attached to the second wall 32, and the second protective member 41 has a second weak portion 43 arranged opposite to the second through hole 34,

[0082] In the cross section perpendicular to the first direction X, the area of ​​the first weak portion 42 is larger than that of the first through hole 33 , and the area of ​​the second weak portion 43 is larger than that of the second through hole 34 .

[0083] Figure 9 FIG. 5 is a schematic block diagram of a device 500 for preparing a battery according to an embodiment of the present application. Figure 9 As shown, the apparatus 500 for preparing a battery may include:

[0084] A first providing module 510 is configured to provide a first battery cell 10 and a second battery cell 20 , wherein the pressure relief mechanism of the first battery cell 10 and the pressure relief mechanism of the second battery cell 20 are arranged opposite to each other along a first direction X;

[0085] A second providing module 520 is used to provide a box 50 , the box 50 receiving the first battery cell 10 and the second battery cell 20 ;

[0086] A third providing module 530 is configured to provide a partition member 30 , the partition member 30 being configured to separate the first battery cell 10 from the second battery cell 20 in the first direction X. The partition member 30 includes a first wall 31 and a second wall 32 disposed opposite each other. The first wall 31 is provided with a first through hole 33 , and the second wall 32 is provided with a second through hole 34 . The first through hole 33 is configured to guide exhaust discharged from the pressure relief mechanism of the first battery cell 10 , and the second through hole 34 is configured to guide exhaust discharged from the pressure relief mechanism of the second battery cell 20 .

[0087] A fourth providing module 540 is configured to provide a first protective member 40 having a first weak portion 42 ; and

[0088] A fifth providing module 550 is configured to provide a second protective member 41 , wherein the second protective member 41 has a second weak portion 43 ;

[0089] The mounting module 560 is used to attach the first protective member 40 to the first wall 31 so that the first weak portion 42 of the first protective member 40 is opposite to the first through hole 33. The second protective member 41 is attached to the second wall 32 so that the second weak portion 43 of the second protective member 41 is opposite to the second through hole 34. The partition member 30 and the battery cell 10 are mounted on the box body 50.

[0090] In the cross section perpendicular to the first direction X, the area of ​​the first weak portion 42 is larger than that of the first through hole 33 , and the area of ​​the second weak portion 43 is larger than that of the second through hole 34 .

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: A first battery cell and a second battery cell, wherein the pressure relief mechanism of the first battery cell and the pressure relief mechanism of the second battery cell are arranged opposite to each other along a first direction; a box body for accommodating the first battery cell and the second battery cell; and a partition member for separating the first battery cell and the second battery cell in the first direction, The partition member includes a first wall and a second wall disposed opposite to each other, the first wall being provided with a first through hole, and the second wall being provided with a second through hole, the first through hole being used to guide the discharge discharged from the pressure relief mechanism of the first battery cell, and the second through hole being used to guide the discharge discharged from the pressure relief mechanism of the second battery cell, a first protective member attached to the first wall, the first protective member having a first weak portion disposed opposite to the first through hole; a second protective member attached to the second wall, the second protective member having a second weak portion disposed opposite to the second through hole; In the cross section perpendicular to the first direction, the area of ​​the first weak portion is larger than that of the first through hole, and the area of ​​the second weak portion is larger than that of the second through hole.

2. The battery according to claim 1, characterized in that The first protective component is disposed closely to the first wall, and the second protective component is disposed closely to the second wall.

3. The battery according to claim 1, characterized in that The first weak portion is provided by forming a notch in the first protective member or configuring the first weak portion to be thinner than other portions of the first protective member. The second weak portion is provided by forming a notch in the second protective member or configuring the second weak portion to be thinner than other portions of the second protective member.

4. The battery according to claim 1, characterized in that Along the first direction, the projection of the first weak portion covers the projection of the first through hole, and the projection of the second weak portion covers the projection of the second through hole.

5. The battery according to claim 1, characterized in that The box body has an upper cover and a box shell connected in a second direction, and the first battery cell and the second battery cell are accommodated in a space surrounded by the upper cover and the box shell. The second direction is orthogonal to the first direction. The partition component is sealed and connected to the upper cover and the box shell.

6. The battery according to claim 5, characterized in that The first wall, the second wall, the upper cover and the box shell together surround and form an exhaust passage for the exhaust to flow.

7. The battery according to claim 6, characterized in that An exhaust member is formed in the housing at a position opposite to an outlet of the exhaust passage. The exhaust member is configured to discharge the exhaust flowing in the exhaust passage to the outside of the housing.

8. The battery according to any one of claims 1 to 7, characterized in that The partition member further includes a connecting member configured to connect the first wall and the second wall.

9. The battery according to claim 8, characterized in that The box body has an upper cover and a box shell connected in a second direction, and the second direction is orthogonal to the first direction. The connecting parts are formed at the top and bottom of the partition part in the second direction, and the connecting part at the top is sealed and connected to the upper cover, while the connecting part at the bottom is sealed and connected to the box shell.

10. The battery according to any one of claims 1 to 7, characterized in that The partition member further includes: a first supporting member for supporting the first guard member; and a second supporting member for supporting the second guard member.

11. The battery according to claim 10, characterized in that The first supporting member is connected to the first wall, The second supporting member is connected to the second wall.

12. The battery according to claim 8, characterized in that The partition member further includes: a first supporting member for supporting the first guard member; and a second supporting member for supporting the second guard member.

13. The battery according to claim 12, characterized in that The first supporting member is connected to the first wall and / or the connecting component, The second supporting member is connected to the first wall and / or the connecting component.

14. The battery according to claim 10, characterized in that A groove for sliding the first guard member is formed between the first wall and the first supporting member, for positioning the first guard member. A groove for sliding the second guard member is formed between the second wall and the second supporting member for positioning the second guard member.

15. The battery according to any one of claims 1 to 7, characterized in that The first guarding member and the second guarding member are connected via a guarding connection member.

16. The battery according to claim 15, characterized in that The first protective member, the protective connector and the second protective member are formed integrally.

17. An electrical device, characterized in that: It comprises the battery according to any one of claims 1 to 16, which is used to provide electrical energy.

18. A method for preparing a battery, characterized in that: include: Providing a first battery cell and a second battery cell, wherein the pressure relief mechanism of the first battery cell and the pressure relief mechanism of the second battery cell are arranged opposite to each other along a first direction; Providing a box body, wherein the box body accommodates the first battery cell and the second battery cell; providing a partition member for separating the first battery cell and the second battery cell in the first direction, the partition member comprising a first wall and a second wall disposed opposite to each other, the first wall being provided with a first through hole, the second wall being provided with a second through hole, the first through hole being used to guide exhaust discharged from a pressure relief mechanism of the first battery cell, and the second through hole being used to guide exhaust discharged from the pressure relief mechanism of the second battery cell; providing a first protective member, the first protective member being attached to the first wall, the first protective member having a first weakened portion disposed opposite to the first through hole; and providing a second protective member, the second protective member being attached to the second wall, the second protective member having a second weakened portion disposed opposite the second through hole; In the cross section perpendicular to the first direction, the area of ​​the first weak portion is larger than that of the first through hole, and the area of ​​the second weak portion is larger than that of the second through hole.

19. A device for preparing a battery, characterized in that: include: A first providing module is configured to provide a first battery cell and a second battery cell, wherein the pressure relief mechanism of the first battery cell and the pressure relief mechanism of the second battery cell are arranged opposite to each other along a first direction; A second providing module is used to provide a box body, wherein the box body accommodates the first battery cell and the second battery cell; a third providing module, configured to provide a partition member, the partition member being configured to separate the first battery cell from the second battery cell in the first direction, the partition member comprising a first wall and a second wall disposed opposite to each other, the first wall being provided with a first through hole, the second wall being provided with a second through hole, the first through hole being configured to guide exhaust discharged from the pressure relief mechanism of the first battery cell, and the second through hole being configured to guide exhaust discharged from the pressure relief mechanism of the second battery cell; a fourth providing module, configured to provide a first protective member, wherein the first protective member has a first weak portion; and a fifth providing module, configured to provide a second protective member, wherein the second protective member has a second weak portion; The module is installed by attaching the first protective member to the first wall so that the first weak portion of the first protective member is opposite to the first through hole, attaching the second protective member to the second wall so that the second weak portion of the second protective member is opposite to the second through hole, and installing the partition member and the battery cell to the box body. In the cross section perpendicular to the first direction, the area of ​​the first weak portion is larger than that of the first through hole, and the area of ​​the second weak portion is larger than that of the second through hole.

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