Battery monomer, battery and electric device

Abstract

The utility model is applicable to the technical field of batteries, and provides a single battery, a battery and a power utilization device, the power utilization device comprises the single battery or the battery, the battery comprises the single battery, and the single battery comprises an electrode assembly, a shell assembly, a first pressure relief mechanism, an electrode terminal, an adapter and a limiting structure. The shell assembly is provided with a first part and a second part which are oppositely arranged; the electrode assembly is arranged between the first component and the second component, and the first component and the electrode assembly are spaced to form a first exhaust space; the first pressure relief mechanism is arranged on the first component and is communicated with the first exhaust space; the electrode terminal is arranged on the second part; the adapter is conducted and connected to the electrode assembly and the electrode terminal; the limiting structure is connected to the second component and used for limiting the adapter in the direction away from the first component. The adapter is limited by the limiting structure along the direction far away from the first component, so that the problem that the electrode assembly collapses towards the first component can be improved, and the directional pressure relief effect of the battery monomer can be improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and more specifically, relates to a battery cell, a battery and an electrical device. Background Art

[0002] In the related art, a battery cell generally includes a shell assembly and an electrode assembly disposed in the shell assembly, and an exhaust space is generally formed between the shell assembly and the electrode assembly. When the battery cell thermally runs away, the high-temperature and high-pressure gas generated by the electrode assembly can flow through the exhaust space to the pressure relief mechanism to achieve directional pressure relief.

[0003] In some cases, when a battery cell experiences thermal runaway, the electrode assembly tends to collapse toward the shell assembly under the pressure generated by the thermal runaway, thereby reducing or even blocking the exhaust space between the electrode assembly and the shell assembly. In this way, it is difficult for the high-temperature and high-pressure gas generated by the electrode assembly to flow through the exhaust space to the pressure relief mechanism, and thus it is difficult to release pressure in a directional manner through the pressure relief mechanism, affecting the directional pressure relief effect of the battery cell. Utility Model Content

[0004] In view of the above problems, the embodiments of the present application provide a battery cell, a battery and an electrical device, which can improve the technical problem of poor directional pressure relief effect of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, including:

[0006] A housing assembly includes a first component and a second component that are arranged opposite to each other;

[0007] The electrode assembly is disposed between the first component and the second component, and the first component and the electrode assembly are spaced apart to form a first exhaust space;

[0008] A first pressure relief mechanism is disposed on the first component and communicated with the first exhaust space;

[0009] An electrode terminal is disposed on the second component;

[0010] A transition piece, conductively connected to the electrode assembly and the electrode terminal;

[0011] The limiting structure is connected to the second component and is used to limit the adapter in a direction away from the first component.

[0012] The battery cell provided in the embodiment of the present application is connected to the second component through a limiting structure, and the adapter is limited in a direction away from the first component, so that under the limiting action of the limiting structure, the adapter is limited in a direction away from the first component, and then under the conductive connection between the adapter and the electrode assembly, the electrode assembly is limited in a direction away from the first component, so that the electrode assembly is away from the first component. In this way, the problem of the electrode assembly collapsing toward the first component and reducing or even blocking the first exhaust space can be improved, and the high-temperature and high-pressure gas generated when the battery cell is in thermal runaway can be helped to flow through the first exhaust space to the first pressure relief mechanism, so as to be directional pressure relief through the first pressure relief mechanism, thereby improving the directional pressure relief effect of the battery cell.

[0013] In some embodiments, the second component includes:

[0014] a first wall, disposed opposite to the first component;

[0015] The first insulating member is arranged between the first wall and the electrode assembly, and the adapter is arranged on a side of the first insulating member away from the first wall; the limiting structure is connected to the first wall and / or the first insulating member.

[0016] The limiting structure can be connected only to the first wall, only to the first insulating member, or to the first wall and the first insulating member, so that the setting of the limiting structure on the second component is very flexible and easy to implement.

[0017] In some embodiments, the limiting structure includes:

[0018] A first limiting member connected to the second member;

[0019] The second limiting member is connected to the first limiting member and is at least partially located on a side of the adapter member facing the first member to limit the adapter member.

[0020] By at least part of the second limiting member being located on the side of the adapter close to the first component, at least part of the second limiting member can be opposite to the adapter along the first direction, so that the second limiting member can abut against the adapter away from the first component along the first direction to limit the adapter.

[0021] In some embodiments, the first stopper and the second stopper are integrally connected;

[0022] Alternatively, the first limiting member and the second limiting member are detachably connected.

[0023] Such a configuration makes the molding of the limiting structure very simple and easy to implement. Alternatively, it is convenient to install the limiting structure on the second component and to realize the limiting function of the limiting structure on the adapter, thereby facilitating the assembly of the battery cell.

[0024] In some embodiments, at least one limiting structure constitutes a group of limiting structures, and a group of limiting structures is used to limit a transition piece; the sizes of the limiting structure and the transition piece satisfy the following relationship:

[0025] 0.002<S1 / S2<0.4;

[0026] Among them, S1 is the projection area of ​​all second limiting members of a group of limiting structures projected onto the adapter along the first direction, and S2 is the projection area of ​​one adapter along the first direction; the first direction is parallel to the distribution direction of the first component and the second component.

[0027] On the one hand, the limiting strength of the limiting structure on the adapter can be improved, thereby improving the problem of the electrode assembly collapsing toward the first component and reducing or even blocking the first exhaust space. On the other hand, a larger exhaust space can be provided between the electrode assembly and the second component without being blocked by the limiting structure, which is beneficial to the flow of high-temperature and high-pressure gas generated when the battery cell is in thermal runaway, thereby facilitating the directional pressure relief effect of the battery cell and reducing the risk of explosion of the battery cell.

[0028] In some embodiments, 0.07<S1 / S2<0.3.

[0029] Such an arrangement facilitates improving the directional pressure relief effect of the battery cell.

[0030] In some embodiments, the second component includes:

[0031] a first wall, disposed opposite to the first component;

[0032] A first insulating member is disposed between the first wall and the electrode assembly, and the adapter is disposed on a side of the first insulating member away from the first wall;

[0033] Among them, the first limiter is plugged into the first insulating member and the first wall in sequence; or, the first limiter is passed through the first insulating member or plugged into the first insulating member and connected to the first wall; or, the first limiter is connected to the first insulating member; or, the first limiter is plugged into the first insulating member.

[0034] By adopting the above technical solution, the connection operation between the first limiting member and the second member is very flexible and easy to implement.

[0035] In some embodiments, the limiting structure includes a plurality of first limiting members spaced apart and distributed in the second component, and opposite ends of at least some of the second limiting members are respectively connected to corresponding first limiting members.

[0036] Such an arrangement enables the opposite ends of the second limiting member to be fixed to the second component by the first limiting member, thereby increasing the limiting strength of the second limiting member on the adapter, thereby greatly improving the problem of the electrode assembly collapsing toward the first component and reducing or even blocking the first exhaust space, thereby facilitating improving the directional pressure relief effect of the battery cell.

[0037] In some embodiments, the first limiting member includes a first connecting portion connected to the second component and a first hook portion arranged on the first connecting portion, and the second limiting member includes a second connecting portion and a second hook portion arranged on the second connecting portion, and the first hook portion and the second hook portion are engaged with each other to form the limiting of the first limiting member and the second limiting member in the distribution direction of the first component and the second component.

[0038] In this way, the first limiting member and the second limiting member can be mutually engaged through the first hook and the second hook, so that the first limiting member and the second limiting member can be detachably connected, which facilitates the assembly of the limiting structure on the second component.

[0039] In some embodiments, the second component is provided with a groove, and at least a portion of the adapter is disposed in the groove; the limiting structure is disposed on the inner wall of the groove, and limits the adapter in the groove.

[0040] By at least partially arranging the limiting structure on the inner wall of the groove, the limiting structure can abut against the side of the adapter facing the first component, so that the limiting structure can limit the adapter.

[0041] In some embodiments, the battery cell comprises:

[0042] The first electrode terminal is an electrode terminal;

[0043] A second electrode terminal is disposed on the first component or the second component;

[0044] The first adapter is a adapter and is conductively connected to the first electrode terminal and the electrode assembly;

[0045] A second adapter, conductively connected to the second electrode terminal and the electrode assembly;

[0046] The first limiting structure is a limiting structure and is connected to the second component and is used to limit the first adapter along a direction away from the first component.

[0047] Such an arrangement enables the two electrode terminals of the battery cell to be located at the same end or at two opposite ends.

[0048] In some embodiments, the second adapter is an adapter; the second electrode terminal is an electrode terminal, and is spaced apart from the first electrode terminal and disposed in the second component;

[0049] The battery cell also includes a second limiting structure, which is spaced apart from the first limiting structure and connected to the second component. The second limiting structure is a limiting structure and is used to limit the second adapter in a direction away from the first component.

[0050] In this way, the limiting strength of the limiting structure on the electrode assembly can be improved, thereby greatly improving the problem of the electrode assembly collapsing toward the first component and reducing or even blocking the first exhaust space, thereby improving the directional pressure relief effect of the battery cell.

[0051] In some embodiments, the second electrode terminal is disposed on the first component, and the second component and the electrode assembly are spaced apart to form a second exhaust space; the second component is provided with a second pressure relief mechanism connected to the second exhaust space;

[0052] The battery cell further includes a third limiting structure, which is connected to the first component and is used to limit the second adapter in a direction away from the second component.

[0053] The second adapter is limited to the first component by the third limiting structure, so that the electrode assembly can be driven away from the second component by the second adapter, thereby improving the problem that the second exhaust space is blocked by the electrode assembly, which affects the directional pressure relief effect of the second pressure relief mechanism.

[0054] In a second aspect, an embodiment of the present application provides a battery, including a battery cell.

[0055] The battery provided in the embodiment of the present application can improve the directional pressure relief effect of the battery by adopting the battery monomer involved above, thereby improving the reliability of the battery.

[0056] In a third aspect, an embodiment of the present application provides an electrical device, including a battery cell or a battery.

[0057] The electrical device provided in the embodiment of the present application can improve the reliability of the battery by adopting the battery cells or batteries involved above, and further improve the reliability of the electrical device.

[0058] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art 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 these drawings without paying any creative labor.

[0060] Figure 1 A schematic diagram of a vehicle provided for some embodiments of the present application;

[0061] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0062] Figure 3 A schematic diagram of a battery cell provided for some embodiments of the present application;

[0063] Figure 4 for Figure 3 Sectional view of AA in the middle;

[0064] Figure 5 A cross-sectional view of a battery cell provided for some other embodiments of the present application;

[0065] Figure 6 An exploded view of a battery cell provided for some embodiments of the present application;

[0066] Figure 7 for Figure 6 The enlarged view of point B in the middle;

[0067] Figure 8 A partial schematic diagram of a battery cell provided in some embodiments of the present application;

[0068] Fig. 9 for Figure 8 Schematic diagram of the decomposition of

[0069] Fig.10 Partial schematic diagram of a battery cell provided for some other embodiments of the present application;

[0070] Fig.11 for Fig.10 Enlarged view of point C in the middle;

[0071] Fig.12 A partial schematic diagram of a battery cell provided in some other embodiments of the present application;

[0072] Fig.13 for Fig.12 The enlarged view of point D in the middle;

[0073] Fig.14 A partial schematic diagram of a battery cell provided in some further embodiments of the present application;

[0074] Fig.15 for Fig.14 Enlarged view of point E in the middle;

[0075] Fig.16 for Figure 8 A schematic projection diagram of a transfer member and a corresponding second limiting member is shown.

[0076] Among them, the reference numerals in the figure are:

[0077] 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-battery cell; 20-housing; 201-accommodation space; 21-first part; 22-second part; 101-first exhaust space; 102-second exhaust space; 11-electrode assembly; 12-housing assembly; 1201-slot; 1202-groove; 121-first component; 1211-second wall; 1212-second insulating member; 122-second component; 1221-first wall; 1222-first insulating member; 1 3-electrode terminal; 13a-first electrode terminal; 13b-second electrode terminal; 14-adapter; 14a-first adaptor; 14b-second adaptor; 15-limiting structure; 15a-first limiting structure; 15b-second limiting structure; 151-first limiting member; 1511-first connecting portion; 1512-first hook portion; 152-second limiting member; 1521-second connecting portion; 1522-second hook portion; 16-first pressure relief mechanism; 17-second pressure relief mechanism; Z-first direction; Y-second direction. DETAILED DESCRIPTION

[0078] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0079] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and 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 should not be understood as a limitation on the present application.

[0080] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0081] In the description of the present application, "plurality" means more than two, and unless otherwise clearly and specifically defined, "more than two" includes two. Accordingly, "multiple groups" means more than two groups, including two groups.

[0082] In the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0083] In the description of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0084] 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.

[0085] In the related art, a battery cell generally includes a shell assembly and an electrode assembly disposed in the shell assembly. The shell assembly is provided with a pressure relief mechanism, and a venting space connected to the pressure relief mechanism is generally formed between the shell assembly and the electrode assembly. When the battery cell thermally runs away, the high-temperature and high-pressure gas generated by the electrode assembly can flow to the pressure relief mechanism through the venting space to achieve directional pressure relief.

[0086] In some cases, when a battery cell experiences thermal runaway, the electrode assembly is prone to collapse toward the shell assembly under the pressure generated by the thermal runaway, thereby reducing or even blocking the exhaust space between the electrode assembly and the shell assembly. In this way, it is difficult for the high-temperature and high-pressure gas generated by the electrode assembly to flow through the exhaust space to the pressure relief mechanism, and thus it is difficult to release pressure in a directional manner through the pressure relief mechanism, which will affect the directional pressure relief effect of the battery cell and easily cause the battery cell to explode.

[0087] For example, in some examples, an insulating spacer is provided between the bottom wall of the shell assembly and the electrode assembly, and the insulating spacer supports the electrode assembly so that the above-mentioned exhaust space is formed between the bottom wall of the shell assembly and the electrode assembly. In addition, a pressure relief mechanism is provided on the bottom wall of the shell assembly. When thermal runaway occurs in the battery cell, the insulating spacer is easily melted under the action of high temperature and loses its mechanical properties, so as to lose its supporting effect on the electrode assembly. Under the high pressure of thermal runaway and the gravity of the electrode assembly, the electrode assembly will collapse downward, thereby reducing or even blocking the exhaust space. In this way, it is difficult for the high-temperature and high-pressure gas generated by the electrode assembly to flow to the pressure relief mechanism through the exhaust space, and thus it is difficult to directionally relieve pressure through the pressure relief mechanism, affecting the directional pressure relief effect of the battery cell.

[0088] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery, and an electrical device, which are connected to the second component through a limiting structure, and the adapter is limited in the direction away from the first component, so that under the limiting action of the limiting structure, the adapter is limited in the direction away from the first component, and then under the relationship of the conductive connection between the adapter and the electrode assembly, the electrode assembly is limited in the direction away from the first component, so that the electrode assembly is away from the first component. In this way, the problem of the electrode assembly collapsing toward the first component and reducing or even blocking the first exhaust space can be improved, and the high-temperature and high-pressure gas generated when the battery cell is thermally runaway can be helped to flow through the first exhaust space to the first pressure relief mechanism, so as to be directional pressure relief through the first pressure relief mechanism, thereby improving the directional pressure relief effect of the battery cell.

[0089] In some embodiments, the battery cells and batteries involved in the embodiments of the present application can be used in electrical devices that use the battery cells or batteries as power sources.

[0090] The electrical devices involved in the embodiments of the present application may be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, vehicles, ships, spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like. According to the power source, the vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like. According to the drive mode, the vehicle may be a front-wheel drive vehicle, a rear-wheel drive vehicle, or a four-wheel drive vehicle.

[0091] In other embodiments, the battery cells and batteries involved in the embodiments of the present application may also be used in energy storage devices, wherein the energy storage devices may be energy storage containers, energy storage cabinets, and the like.

[0092] The battery involved in the embodiment of the present application can be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid connection through a busbar component. Hybrid connection means that multiple battery cells are connected in both series and in parallel.

[0093] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. As an example, the multiple battery cells may be fixed by cable ties or the like to form a battery module. As an example, the multiple battery cells may also be fixed by end plates, side plates, or the like to form a battery module.

[0094] In other embodiments, the battery may be a battery pack, which may include a box and a battery cell. As an example, the battery cell may be directly accommodated in the box. As an example, the battery cell may also be formed into a battery module first and then accommodated in the box.

[0095] The battery cell involved in the embodiments of the present application refers to the smallest unit for storing and outputting electric energy. The battery cell may be a secondary battery or a primary battery. The battery cell may be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell may be cylindrical, flat, rectangular, or in other shapes.

[0096] For ease of description, the embodiments of the present application are described using an electrical device as a vehicle as an example.

[0097] In some embodiments, see Figure 1 , Figure 1Schematic diagram of a vehicle 1000 provided for some embodiments of the present application. The above-mentioned battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0098] In some embodiments, the battery 100 can be used not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0099] In some embodiments, see Figure 2 , Figure 2 The exploded view of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 20 and a plurality of battery cells 10. The box body 20 is a structure having a receiving space 201 inside, and the box body 20 can adopt a variety of structures. In some embodiments, the box body 20 can include a first part 21 and a second part 22, and the first part 21 and the second part 22 cover each other and jointly define the receiving space 201.

[0100] The first part 21 may be a hollow structure with an opening at one end, and the second part 22 may be a plate-like structure, and the second part 22 covers the opening side of the first part 21, so that the first part 21 and the second part 22 together define the above-mentioned accommodation space 201. Alternatively, please refer to Figure 2 The first part 21 and the second part 22 can both be hollow structures with an opening at one end, and the opening side of the first part 21 covers the opening side of the second part 22, so that the first part 21 and the second part 22 jointly define the above-mentioned accommodating space 201.

[0101] The box body 20 composed of the first part 21 and the second part 22 can be in various shapes, such as a cylinder, a cuboid, etc.

[0102] In some embodiments, see Figure 2, multiple battery cells 10 can be connected in series, in parallel or in a mixed connection to form a whole, and then the whole formed by the multiple battery cells 10 is directly accommodated in the above-mentioned accommodation space 201 of the box body 20. In other embodiments, multiple battery cells 10 can also be connected in series, in parallel or in a mixed connection first, and arranged and fixed to form a battery module, and the battery module is accommodated in the above-mentioned accommodation space 201 of the box body 20. In some other embodiments, multiple battery cells 10 can also be connected in series, in parallel or in a mixed connection first, and arranged and fixed to form multiple battery modules, and multiple battery modules are then connected in series, in parallel or in a mixed connection to form a whole, and accommodated in the above-mentioned accommodation space 201 of the box body 20.

[0103] In some embodiments, the box 20 of the battery 100 can be used as part of the chassis structure of the vehicle 1000. For example, part of the box 20 can become at least a part of the chassis of the vehicle 1000, or part of the box 20 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0104] In some embodiments, please refer to Figures 3 to 5 , Figure 3 A top view of a battery cell 10 provided in some embodiments of the present application, specifically, Figure 3 A schematic diagram of a battery cell 10 provided in some embodiments of the present application from a perspective of a first direction ZZ mentioned below, Figure 4 for Figure 3 Section view along AA, Figure 5 The cross-sectional view of a battery cell 10 provided in some other embodiments of the present application. The battery cell 10 may include an electrode assembly 11 and a housing assembly 12 .

[0105] The electrode assembly 11 is a component in the battery cell 10 where electrochemical reactions occur. The electrode assembly 11 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 11, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear. The pole ear of the positive electrode sheet is the positive pole ear, and the pole ear of the negative electrode sheet is the negative pole ear. The positive pole ear and the negative pole ear can be located together at one end of the main body or respectively at two opposite ends of the main body.

[0106] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0107] In some cases, the electrode assembly 11 may also be referred to as a bare cell, a wound body, a laminated body, etc.

[0108] In some embodiments, the battery cell 10 may further include an electrolyte, which plays a role in conducting ions between the positive electrode plate and the negative electrode plate. The electrolyte involved in the embodiments of the present application may be liquid, gel or solid.

[0109] The housing assembly 12 is an assembly for defining an internal environment of the battery cell 10 .

[0110] In some embodiments, please refer to Figures 3 to 5 The shell assembly 12 may include a shell and an end cap. The shell and the end cap are components for jointly defining the internal environment of the battery cell 10. The internal environment defined by the shell and the end cap is used to accommodate the electrode assembly 11 and the electrolyte. Among them, the shell and the end cap may be independent components. Specifically, the shell has an opening, and the end cap is arranged at the opening of the shell to jointly define the internal environment of the battery cell 10 with the shell, and to isolate the internal environment of the battery cell 10 from the external environment. Alternatively, the shell and the end cap may also be an integrated structure. Specifically, a common connection surface may be formed between the end cap and the shell before the electrode assembly 11 is placed in the shell. When the electrode assembly 11 needs to be packaged after the electrode assembly 11 is placed in the shell, the end cap is closed with the shell.

[0111] Among them, Figure 3 and Figure 4 As shown, the number of end caps can be one. Alternatively, Figure 5 As shown, the number of the end covers may also be two, and the two end covers are respectively arranged at two opposite ends of the shell.

[0112] The shell may be cylindrical, square, or other shapes, which may be determined according to the specific shape and size of the electrode assembly 11. In addition, the shell and the end cap may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like.

[0113] In some embodiments, please refer to Figures 3 to 5 The battery cell 10 may further include an electrode terminal 13. The electrode terminal 13 refers to a component having a conductive property, and the electrode terminal 13 serves as a current transmission end of the battery cell 10 for transmitting current. The electrode terminal 13 may be, but is not limited to, a pole.

[0114] The electrode terminal 13 is conductively connected to the electrode assembly 11. Specifically, the electrode terminal 13 is conductively connected to the tab of the electrode assembly 11. The electrode terminal 13 can be directly conductively connected to the tab by welding, bonding, etc.; or, an adapter 14 can be provided between the electrode terminal 13 and the tab, and the adapter 14 realizes the conversion between the electrode terminal 13 and the tab so as to enable current flow, thereby indirectly realizing the conductive connection between the electrode terminal 13 and the tab.

[0115] The adapter 14 refers to a metal structure with conductive properties, such as but not limited to a copper busbar.

[0116] In some embodiments, please refer to Figures 3 to 5 The electrode terminal 13 is provided in two, and the two electrode terminals 13 are respectively a positive electrode terminal 13 and a negative electrode terminal 13 . The positive electrode terminal 13 is conductively connected to the positive electrode tab of the electrode assembly 11 , and the negative electrode terminal 13 is conductively connected to the negative electrode tab of the electrode assembly 11 .

[0117] In some embodiments, the electrode terminal 13 is disposed on the housing assembly 12. Specifically, the electrode terminal 13 can be disposed on the housing of the housing assembly 12, or on the end cap of the housing assembly 12, such as Figures 3 to 5 As shown. The positive electrode terminal 13 and the negative electrode terminal 13 can be provided on the housing at the same time; or, as shown Figures 3 to 5 As shown, the positive electrode terminal 13 and the negative electrode terminal 13 are both disposed on the end cover; or, one of the positive electrode terminal 13 and the negative electrode terminal 13 is disposed on the shell, and the other is disposed on the end cover.

[0118] Among them, Figure 3 and Figure 4 As shown, the positive electrode terminal 13 and the negative electrode terminal 13 can be disposed at the same end of the housing assembly 12. Alternatively, as Figure 5 As shown, the positive electrode terminal 13 and the negative electrode terminal 13 may be disposed at opposite ends of the housing assembly 12 .

[0119] In some embodiments, please refer to Figures 3 to 5 The housing assembly 12 may further include a lower plastic, which is disposed in the internal environment defined by the housing and the end cover. The lower plastic is a plastic part, which is mainly used to be disposed in the internal environment of the battery cell 10 to provide insulation.

[0120] like Figures 3 to 5 As shown, the lower plastic is disposed between the end cap and the electrode assembly 11 to achieve insulation between the end cap and the electrode assembly 11; and the lower plastic is also disposed between the end cap and the adapter 14 to achieve insulation between the end cap and the adapter 14. Alternatively, the lower plastic is disposed between the housing and the electrode assembly 11 to achieve insulation between the housing and the electrode assembly 11; and the lower plastic is also disposed between the housing and the adapter 14 to achieve insulation between the housing and the adapter 14.

[0121] Among them, Figure 3 and Figure 4As shown, when the positive electrode terminal 13 and the negative electrode terminal 13 are arranged at the same end of the shell assembly 12, the positive electrode tab and the negative electrode tab of the electrode assembly 11 are located at the same end of the electrode assembly 11, and one end of the electrode assembly 11 is provided with an adapter 14 and a lower plastic. Specifically, the end of the electrode assembly 11 having the positive electrode tab and the negative electrode tab is provided with a lower plastic. Figure 5 As shown, when the positive electrode terminal 13 and the negative electrode terminal 13 can be separately disposed at opposite ends of the shell assembly 12, the positive electrode tab and the negative electrode tab of the electrode assembly 11 are respectively located at opposite ends of the electrode assembly 11, and the opposite ends of the electrode assembly 11 are both provided with a transition piece 14 and a lower plastic. Specifically, the end of the electrode assembly 11 having the positive electrode tab and the end of the electrode assembly 11 having the negative electrode tab can both be provided with a lower plastic.

[0122] Please also read Figures 4 to 7 , and combined with other drawings. Among them, Figure 6 This is a schematic diagram of an exploded view of a battery cell 10 provided in some embodiments of the present application. Figure 7 for Figure 6 Enlarged view of point B in the figure. The battery cell 10 provided in the embodiment of the present application includes an electrode assembly 11, a shell assembly 12, an electrode terminal 13, an adapter 14, a first pressure relief mechanism 16 and a limiting structure 15. The electrode assembly 11 and the adapter 14 are both arranged in the shell assembly 12. The shell assembly 12 is provided with a first component 121 and a second component 122 that are arranged opposite to each other, the electrode assembly 11 is arranged between the first component 121 and the second component 122, and the first component 121 and the electrode assembly 11 are spaced to form a first exhaust space 101. The first pressure relief mechanism 16 is arranged in the first component 121, and the first pressure relief mechanism 16 is connected to the first exhaust space 101. The electrode terminal 13 is arranged in the second component 122, and the adapter 14 is conductively connected to the electrode assembly 11 and the electrode terminal 13. The limiting structure 15 is connected to the second component 122, and is used to limit the adapter 14 in a direction away from the first component 121.

[0123] The first component 121 and the second component 122 refer to two parts of the housing assembly 12. Figure 4 and Figure 5 As shown, the first component 121 and the second component 122 are arranged at opposite ends of the housing assembly 12 along the first direction Z, that is, the first component 121 and the second component 122 are arranged opposite to each other along the first direction Z. In the first direction Z, the electrode assembly 11 is located between the first component 121 and the second component 122. The first direction Z is the distribution direction of the first component 121 and the second component 122, and is Figure 4 and Figure 5 In some cases, the first direction Z may be a length direction or a height direction of the battery cell 10 .

[0124] The first component 121 may include a second wall 1211, such as Figure 4 As shown; the first component 121 may also include a second wall 1211 and a second insulating member 1212 disposed on one side of the second wall 1211 close to the electrode assembly 11, such as Figure 5 As shown. The second wall 1211 is a solid wall of the housing assembly 12. The second wall 1211 can be one of the solid walls of the housing of the housing assembly 12, such as Figure 4 The second wall 1211 may also be an end cover of the housing assembly 12, such as Figure 5 As shown. The second insulating member 1212 refers to a component with insulating properties, which may be, but is not limited to, lower plastic. The second insulating member 1212 may be disposed between the second wall 1211 and the electrode assembly 11 to achieve insulation between the second wall 1211 and the electrode assembly 11. The second insulating member 1212 may also be disposed between the second wall 1211 and the adapter 14 to achieve insulation between the adapter 14 and the second wall 1211.

[0125] The second component 122 may include a first wall 1221 and a first insulating member 1222 as described below. Figures 4 to 7 As shown, the second component 122 may also only include the first wall 1221 mentioned below. The definitions of the first wall 1221 and the first insulating member 1222 will be explained in the corresponding parts below, and will not be repeated here.

[0126] The first exhaust space 101 refers to a space formed by the first component 121 and the electrode assembly 11, and is mainly used for gas exhaust. Specifically, the first component 121 and the electrode assembly 11 are spaced along the first direction Z to form the first exhaust space 101.

[0127] The first pressure relief mechanism 16 is a pressure relief mechanism that can release the internal pressure of the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a threshold value. For example, when the battery cell 10 is working normally, the gas pressure inside the battery cell 10 is less than the opening pressure value of the pressure relief mechanism, the pressure relief mechanism is in a closed state, and the gas inside the battery cell 10 is not connected to the gas outside. When the battery cell 10 has thermal runaway due to internal and external factors such as overcharge, overdischarge, overheating, and mechanical collision, a large amount of high-temperature and high-pressure gas is generated inside the battery cell 10, making the pressure inside the battery cell 10 greater than the opening pressure value of the pressure relief mechanism, and the pressure relief mechanism changes from a closed state to an open state, and the high-temperature and high-pressure gas inside the battery cell 10 can be discharged to the outside of the battery cell 10 through the pressure relief mechanism.

[0128] like Figure 4As shown, when the first component 121 includes the second wall 1211, the first pressure relief mechanism 16 is disposed on the second wall 1211. When the first component 121 includes the second wall 1211 and the second insulating member 1212, the first pressure relief mechanism 16 can be disposed on the second wall 1211, as shown in FIG. Figure 5 As shown; the first pressure relief mechanism 16 can also be arranged on the second wall 1211 and the second insulating member 1212 at the same time.

[0129] For example, the first pressure relief mechanism 16 is disposed on the second wall 1211. Figure 4 As shown, the first pressure relief mechanism 16 can be a weak structure provided on the second wall 1211; or, the first pressure relief mechanism 16 can also be a pressure valve, etc. When the first pressure relief mechanism 16 is a weak structure, the structural strength of the first pressure relief mechanism 16 is lower than the structural strength of the end cover and other positions of the shell. In this way, when the battery cell 10 has thermal runaway, the high-temperature and high-pressure gas generated by the battery cell 10 can break through the first pressure relief mechanism 16 to be released outside the battery cell 10.

[0130] As an example, the first pressure relief mechanism 16 can be integrally formed with the second wall 1211. For example, the first pressure relief mechanism 16 is a notch provided on the second wall 1211. As another example, the first pressure relief mechanism 16 can also be separately provided and connected with the second wall 1211.

[0131] The first exhaust space 101 is connected to the first pressure relief mechanism 16, which means that the gas in the first exhaust space 101 can flow to the first pressure relief mechanism 16. As an example, Figure 4 As shown, the first pressure relief mechanism 16 is exposed to the first exhaust space 101. In this way, the high-temperature and high-pressure gas generated when the battery cell 10 is in thermal runaway can flow to the first pressure relief mechanism 16 through the first exhaust space 101, and be released and directional pressure relief through the first pressure relief mechanism 16, which is conducive to improving the reliability of the battery 100.

[0132] The adapter 14 is conductively connected to the electrode assembly 11 and the electrode terminal 13, which means that the adapter 14 is conductively connected to the electrode terminal 13, and the adapter 14 is conductively connected to the electrode assembly 11. The adapter 14 is conductively connected to the electrode terminal 13, which means that the adapter 14 is connected to the electrode terminal 13, and the adapter 14 is electrically conductive to the electrode terminal 13. The adapter 14 is conductively connected to the electrode assembly 11, which means that the adapter 14 is connected to the electrode assembly 11, and the adapter 14 is electrically conductive to the electrode assembly 11. Based on this, the adapter 14 can achieve overcurrent between the electrode assembly 11 and the electrode terminal 13. Among them, the above-mentioned conductive connection method may include but is not limited to one or more of welding, bonding and the like. Welding may include but is not limited to one or more of laser welding, ultrasonic welding, penetration welding and the like. Among them, the adapter 14 is conductively connected to the electrode assembly 11, specifically, the adapter 14 is conductively connected to the pole ear of the electrode assembly 11.

[0133] The electrode terminal 13 involved in the embodiment of the present application can be a positive electrode terminal 13 or a negative electrode terminal 13. When the electrode terminal 13 is a positive electrode terminal 13, the adapter 14 is conductively connected to the positive electrode terminal 13 and the positive electrode tab of the electrode assembly 11. When the electrode terminal 13 is a negative electrode terminal 13, the adapter 14 is conductively connected to the negative electrode terminal 13 and the negative electrode tab of the electrode assembly 11. When the number of electrode terminals 13 is two, the two electrode terminals 13 can be a positive electrode terminal 13 and a negative electrode terminal 13, respectively.

[0134] When the second component 122 only includes the first wall 1221 mentioned below, the electrode terminal 13 is arranged on the second component 122, which means that the electrode terminal 13 is arranged on the first wall 1221. When the second component 122 includes the first wall 1221 and the first insulating member 1222 mentioned below, as Figures 4 to 7 As shown, the electrode terminal 13 is disposed on the second component 122 , and the electrode terminal 13 may be disposed on the first wall 1221 , or the electrode terminal 13 is disposed on the first insulating member 1222 , or the electrode terminal 13 is disposed on the first wall 1221 and the first insulating member 1222 .

[0135] The limiting structure 15 refers to a structure used to limit the electrode assembly 11 .

[0136] The limiting structure 15 is connected to the second component 122, specifically, the limiting structure 15 can be connected to any component of the second component 122. When the second component 122 only includes the first wall 1221 mentioned below, the limiting structure 15 can be connected to the first wall 1221. When the second component 122 includes the first wall 1221 and the first insulating member 1222 mentioned below, Figures 4 to 7As shown, the limiting structure 15 can be connected to the first wall 1221 , can be connected to the first insulating member 1222 , or can be connected to the first wall 1221 and the first insulating member 1222 .

[0137] The limiting structure 15 is used to limit the adapter 14 in the direction away from the first component 121, which means that the limiting structure 15 is used to limit the adapter 14 in the direction away from the first component 121 in the first direction Z. The limiting structure 15 can be connected to the adapter 14, so that the adapter 14 is limited in the direction away from the first component 121 under the connection of the limiting structure 15, thereby driving the electrode assembly 11 to be limited in the direction away from the first component 121; or, the limiting structure 15 can also be at least partially located on the side of the adapter 14 facing the first component 121, so that the adapter 14 can abut against the limiting structure 15 to be limited in the direction away from the first component 121, thereby enabling the electrode assembly 11 to be limited in the direction away from the first component 121.

[0138] The battery cell 10 provided in the embodiment of the present application is connected to the second component 122 through the limiting structure 15, and the adapter 14 is limited in the direction away from the first component 121, so that under the limiting action of the limiting structure 15, the adapter 14 can be limited in the direction away from the first component 121, and then the electrode assembly 11 is limited in the direction away from the first component 121 under the relationship of the conductive connection between the electrode assembly 11 and the adapter 14, so that the electrode assembly 11 is away from the first component 121. In this way, the problem that the electrode assembly 11 collapses toward the first component 121 and reduces or even blocks the first exhaust space 101 can be improved, so that the first exhaust space 101 has better exhaust performance, which helps the high-temperature and high-pressure gas generated when the battery cell 10 is thermally runaway to flow through the first exhaust space 101 to the first pressure relief mechanism 16, so as to be directional pressure relief through the first pressure relief mechanism 16. Thereby, the directional pressure relief effect of the battery cell 10 can be improved, so that the reliability of the battery 100 can be improved.

[0139] In some embodiments, please refer to Figures 4 to 7 , and in combination with other drawings. The second component 122 includes a first wall 1221 and a first insulating member 1222. The first wall 1221 is arranged opposite to the first component 121. The first insulating member 1222 is arranged between the first wall 1221 and the electrode assembly 11, and the adapter 14 is arranged on a side of the first insulating member 1222 away from the first wall 1221.

[0140] The first wall 1221 is a solid wall of the housing assembly 12. The first wall 1221 may be an end cap, such as Figures 4 to 7 As shown, the first wall 1221 may also be a solid wall of the housing. The first wall 1221 and the first component 121 are arranged opposite to each other along the first direction Z.

[0141] The first insulating member 1222 is a component with insulating properties, and the first insulating member 1222 may be, but is not limited to, lower plastic. The first insulating member 1222 is disposed between the first wall 1221 and the electrode assembly 11, and is used to achieve insulation between the first wall 1221 and the electrode assembly 11. The adapter 14 is disposed on a side of the first insulating member 1222 away from the first wall 1221, so that the first insulating member 1222 is also disposed between the first wall 1221 and the adapter 14, and is used to achieve insulation between the first wall 1221 and the adapter 14.

[0142] Among some possible designs, such as Fig.12 and Fig.13 As shown, the limiting structure 15 is only connected to the first wall 1221. Alternatively, in some other possible designs, such as Fig.10 , Fig.11 , Fig.14 and Fig.15 As shown, the limiting structure 15 is only connected to the first insulating member 1222. Alternatively, in some other possible designs, such as Figure 8 and Fig. 9 As shown, the limiting structure 15 is connected to the first wall 1221 and the first insulating member 1222 . Based on this, the limiting structure 15 limits the adapter 14 on the first insulating member 1222 in a direction away from the first component 121 .

[0143] in, Figure 8 A partial schematic diagram of a battery cell 10 provided in some embodiments of the present application, Fig. 9 for Figure 8 Schematic diagram of the decomposition. Fig.10 Partial schematic diagram of a battery cell 10 provided in some other embodiments of the present application, Fig.11 for Fig.10 Enlarged view of point C in the middle. Fig.12 A partial schematic diagram of a battery cell 10 provided in some embodiments of the present application, Fig.13 for Fig.12 Enlarged view of point D in the middle. Fig.14 A partial schematic diagram of a battery cell 10 provided in some embodiments of the present application, Fig.15 for Fig.14 Enlarged view of point E in the middle.

[0144] The limiting structure 15 can be connected only to the first wall 1221, only to the first insulating member 1222, or to the first wall 1221 and the first insulating member 1222, so that the setting of the limiting structure 15 on the second member 122 is very flexible and easy to implement.

[0145] In some embodiments, please refer to Figures 7 to 13, and in combination with other drawings. The limiting structure 15 includes a first limiting member 151 and a second limiting member 152. The first limiting member 151 is connected to the second component 122, and the second limiting member 152 is connected to the first limiting member 151. At least part of the second limiting member 152 is located on the side of the adapter 14 facing the first component 121 to limit the adapter 14.

[0146] The first limiting member 151 and the second limiting member 152 are respectively two parts of the limiting structure 15 .

[0147] The first stopper 151 is a portion of the stopper structure 15 used to connect the second component 122. Specifically, the first stopper 151 may be connected only to the first wall 1221, only to the first insulating member 1222, or to both the first wall 1221 and the first insulating member 1222.

[0148] Among them, the second stopper 152 is the part of the stopper structure 15 that is mainly used to stop the adapter 14. Specifically, at least part of the second stopper 152 is located on the side of the adapter 14 close to the first component 121, that is, at least part of the second stopper 152 is located on the side of the adapter 14 away from the second component 122, so that the adapter 14 can lean against the second stopper 152 toward the first component 121, so that it cannot continue to move toward the first component 121 under the limitation of the second stopper 152. In this way, the adapter 14 can be limited in the direction away from the first component 121, thereby achieving the limitation of the electrode assembly 11, so as to improve the problem that the electrode assembly 11 collapses toward the first component 121 and reduces or even blocks the first exhaust space 101, so as to improve the directional pressure relief effect of the battery cell 10.

[0149] Among them, at least a portion of the second limit member 152 is located on a side of the adapter 14 close to the first component 121, so that at least a portion of the second limit member 152 can be opposite to the adapter 14 along the first direction Z, so that the second limit member 152 can be away from the first component 121 along the first direction Z and abut against the adapter 14, thereby limiting the adapter 14.

[0150] In some embodiments, at least a portion of the limiting structure 15 is an insulating structure to avoid the problem of conduction between the electrode assembly 11 and the shell assembly 12 caused by the setting of the limiting structure 15 .

[0151] As an example, the second limiting member 152 of the limiting structure 15 is an insulating structure. As another example, the first limiting member 151 and the second limiting member 152 of the limiting structure 15 are both insulating structures.

[0152] In some embodiments, please refer to Figures 7 to 11 , and in combination with other drawings. The first stopper 151 and the second stopper 152 are connected as one piece.

[0153] When both the first limiting member 151 and the second limiting member 152 are plastic members, the first limiting member 151 and the second limiting member 152 can be integrally connected by injection molding.

[0154] Such an arrangement makes the forming method of the limiting structure 15 very simple and easy to implement.

[0155] Alternatively, in other embodiments, please refer to Fig.12 and Fig.13 , and in combination with other drawings. The first stopper 151 and the second stopper 152 are detachably connected.

[0156] With such arrangement, after the adapter 14 is installed to the first insulating member 1222, the second stopper 152 can be connected to the first stopper 151, so that at least a portion of the second stopper 152 can be located on the side of the adapter 14 away from the second component 122, thereby achieving the limit position of the adapter 14. Therefore, it is convenient to install the stopper structure 15 on the second component 122, and it is convenient to realize the limit position function of the stopper structure 15 on the adapter 14, and further, it is convenient to assemble the battery cell 10.

[0157] In some embodiments, please refer to Figures 8 to 16 , and combined with other drawings. Fig.16 for Figure 8 Schematic diagram of projection of one adapter 14 and the second limiting member 152 along the first direction Z. At least one limiting structure 15 constitutes a group of limiting structures 15 , and a group of limiting structures 15 is used to limit one adapter 14 .

[0158] The dimensions of the limiting structure 15 and the adapter 14 satisfy the following relationship:

[0159] 0.002<S1 / S2<0.4;

[0160] S1 is the projection area of ​​all second limiting members 152 of a group of limiting structures 15 projected onto the adapter 14 along the first direction Z, and S2 is the projection area of ​​one adapter 14 along the first direction Z. The first direction Z is parallel to the distribution direction of the first component 121 and the second component 122 .

[0161] It can be understood that a group of limiting structures 15 can include one limiting structure 15, that is, one adapter 14 is limited by one limiting structure 15; a group of limiting structures 15 can also include multiple limiting structures 15, and one adapter 14 is limited by a group of multiple limiting structures 15. As an example, Figure 8 , Fig. 9 , Fig.12 , Fig.13 , Fig.14 and Fig.15 As shown, a group of limiting structures 15 includes one limiting structure 15, that is, one adapter 14 is limited by one limiting structure 15. As another example, Fig.10 and Fig.11 As shown, a group of limiting structures 15 includes multiple limiting structures 15 , that is, one adapter 14 is limited by multiple limiting structures 15 .

[0162] As an example, Figure 8 and Fig.16 As shown, Fig.16 for Figure 8 The schematic diagram of the projection of an adapter 14 and the corresponding second position-limiting member 152 along the first direction Z is shown. The shadow area indicated by S1 is the projection area of ​​all the second position-limiting members 152 of a group of position-limiting structures 15 projected onto the adapter 14 along the first direction Z, and the area is S1. The shadow area indicated by S2 is the projection area of ​​one adapter 14 along the first direction Z, and the area is S2, including the area overlapping with the shadow area indicated by S1.

[0163] The area of ​​the projection of the second position-limiting member 152 onto the adapter 14 along the first direction Z refers to the area of ​​a portion of the second position-limiting member 152 that is opposite to the adapter 14 along the first direction Z.

[0164] S1 / S2 can be 0.005, 0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, 0.055, 0.06, 0.065, 0.07, 0.08, 0.09, 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, 0.35, 0.38, etc.

[0165] By adopting the above technical solution, on the one hand, the portion of all the second limiting members 152 of a group of limiting structures 15 that is used to be opposite to the adapter 14 along the first direction Z has a larger area, so that the limiting strength of the limiting structure 15 on the adapter 14 can be improved, and then the problem of the electrode assembly 11 collapsing toward the first component 121 and reducing or even blocking the first exhaust space 101 can be improved, which helps to improve the directional pressure relief effect of the battery cell 10. On the other hand, a larger exhaust space can also be provided between the electrode assembly 11 and the second component 122, which will not be blocked by the limiting structure 15, which is conducive to the flow of high-temperature and high-pressure gas generated when the battery cell 10 is in thermal runaway, and then it is convenient to improve the directional pressure relief effect of the battery cell 10 and reduce the explosion risk of the battery cell 10.

[0166] In some embodiments, 0.07<S1 / S2<0.3.

[0167] For example, S1 / S2 can be 0.075, 0.08, 0.085, 0.09, 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, etc.

[0168] Such an arrangement can improve the directional pressure relief effect of the battery cell 10 .

[0169] In some embodiments, please refer to Figures 8 to 13 , and in combination with other drawings. The second component 122 includes a first wall 1221 and a first insulating member 1222. The first wall 1221 is arranged opposite to the first component 121. The first insulating member 1222 is arranged between the first wall 1221 and the electrode assembly 11, and the adapter 14 is arranged on a side of the first insulating member 1222 away from the first wall 1221.

[0170] Among some possible designs, such as Figure 8 and Fig. 9 As shown, the first stopper 151 is sequentially inserted into the first insulating member 1222 and the first wall 1221, so that the first stopper 151 is connected to the first insulating member 1222 and the first wall 1221, and the first stopper 151 is fixedly connected to the second member 122. As an example, the first insulating member 1222 is provided with a slot 1201 through it along the first direction Z, and the first stopper 151 can be sequentially inserted into the slot 1201 of the first insulating member 1222 and the first wall 1221 along the first direction Z, so as to respectively have an interference fit with the slot 1201 of the first insulating member 1222 and the first wall 1221, thereby achieving the first stopper 151 fixedly connected to the first insulating member 1222 and the first wall 1221, respectively.

[0171] Or, in some other possible designs, such as Fig.12 and Fig.13 As shown, the first stopper 151 is disposed through the first insulating member 1222 and connected to the first wall 1221, so that the first stopper 151 is connected to the first wall 1221, thereby achieving a fixed connection between the first stopper 151 and the second member 122. The first stopper 151 and the first wall 1221 can be connected as one piece, or can be connected separately by bolt fixing, riveting, or the like.

[0172] Alternatively, in some other possible designs, the first stopper 151 is plugged into the first insulating member 1222 and connected to the first wall 1221, so that the first stopper 151 is connected to the first wall 1221 and the first insulating member 1222, and the first stopper 151 is fixedly connected to the second member 122. The first stopper 151 and the first wall 1221 can be connected as one piece, or can be connected separately by bolting, riveting, etc. As an example, the first stopper 151 is plugged into the first insulating member 1222 and has an interference fit with the first insulating member 1222 to achieve a fixed connection between the first stopper 151 and the first insulating member 1222.

[0173] Or, in some other possible designs, such as Fig.10 and Fig.11 As shown, the first stopper 151 is connected to the first insulating member 1222 to achieve fixed connection between the first stopper 151 and the second member 122. The first stopper 151 and the first insulating member 1222 can be integrally connected by integral injection molding or separately connected by bolts, riveting, etc.

[0174] Alternatively, in some other possible designs, the first stopper 151 is plugged into the first insulating member 1222 to achieve a fixed connection between the first stopper 151 and the second member 122. As an example, the first stopper 151 is plugged into the first insulating member 1222 and has an interference fit with the first insulating member 1222 to achieve a fixed connection between the first stopper 151 and the first insulating member 1222.

[0175] By adopting the above technical solution, the connection operation between the first limiting member 151 and the second member 122 is very flexible and easy to implement.

[0176] In some embodiments, please refer to Fig.12 and Fig.13 , and in combination with other drawings. The limiting structure 15 includes a plurality of first limiting members 151, and the plurality of first limiting members 151 are spaced and distributed in the second component 122. At least two opposite ends of some of the second limiting members 152 are connected to the corresponding first limiting members 151 respectively.

[0177] At least two opposite ends of some of the second limiting members 152 are respectively connected to the corresponding first limiting members 151 , which means that among the opposite ends of at least one second limiting member 152 , one end is connected to at least one first limiting member 151 , and the other end is connected to at least one first limiting member 151 .

[0178] Such a configuration enables the opposite ends of the second limiting member 152 to be fixed to the second component 122 by the first limiting member 151, thereby increasing the limiting strength of the second limiting member 152 on the adapter 14, thereby greatly improving the problem of the electrode assembly 11 collapsing toward the first component 121 and reducing or even blocking the first exhaust space 101, thereby facilitating improving the directional pressure relief effect of the battery cell 10.

[0179] Among them, the opposite ends of the second limiting member 152 can be fixed on the second component 122 through the first limiting member 151, so that the area of ​​the second limiting member 152 relative to the adapter 14 along the first direction Z can be larger, which is beneficial to improving the limiting strength of the limiting structure 15 on the adapter 14.

[0180] In some embodiments, please refer to Fig.12 and Fig.13 , and in combination with other drawings. The first limiting member 151 includes a first connecting portion 1511 and a first hook portion 1512. The first connecting portion 1511 is connected to the second component 122, and the first hook portion 1512 is arranged on the first connecting portion 1511. The second limiting member 152 includes a second connecting portion 1521 and a second hook portion 1522, and the second hook portion 1522 is arranged on the second connecting portion 1521. The first hook portion 1512 and the second hook portion 1522 are mutually engaged to form the limiting of the first limiting member 151 and the second limiting member 152 in the first direction Z. Among them, the first direction Z is parallel to the distribution direction of the first component 121 and the second component 122.

[0181] The first connection portion 1511 is connected to the first wall 1221 of the second component 122 ; or, the first connection portion 1511 is connected to the first insulating member 1222 of the second component 122 ; or, the first connection portion 1511 is connected to the first wall 1221 of the second component 122 and the first insulating member 1222 .

[0182] At least a portion of the second connection portion 1521 is located on a side of the adapter 14 away from the second component 122, so that at least a portion of the second connection portion 1521 is opposite to the adapter 14 along the first direction Z, so that the second connection portion 1521 can limit the adapter 14, and further limit the electrode assembly 11 in the direction away from the first component 121 along the first direction Z.

[0183] The first limiting member 151 and the second limiting member 152 can be mutually engaged through the first hook 1512 and the second hook 1522 , so that the first limiting member 151 and the second limiting member 152 can be detachably connected, thereby facilitating the assembly of the limiting structure 15 on the second component 122 .

[0184] In some embodiments, please refer to Fig.14 and Fig.15, and in combination with other drawings. The second component 122 is provided with a groove 1202, and at least a portion of the adapter 14 is disposed in the groove 1202. The limiting structure 15 is disposed on the inner wall of the groove 1202, and limits the adapter 14 in the groove 1202.

[0185] Specifically, the first insulating member 1222 of the second component 122 is recessed along the first direction Z toward one side of the first component 121 to form a groove 1202 , and at least a portion of the adapter 14 is located in the groove 1202 .

[0186] By at least partially disposing the limiting structure 15 on the inner wall of the groove 1202 , the limiting structure 15 can abut against the side of the adapter 14 facing the first component 121 , so that the limiting structure 15 can limit the adapter 14 .

[0187] The limiting structure 15 may be integrally provided on the inner wall of the groove 1202 , that is, the limiting structure 15 is integrally connected to the first insulating member 1222 .

[0188] In some embodiments, please refer to Figures 4 to 15 , and combined with other drawings. The battery cell 10 includes a first electrode terminal 13a, a second electrode terminal 13b, a first adapter 14a, a second adapter 14b and a first limiting structure 15a. The first electrode terminal 13a is the above-mentioned electrode terminal 13, and the first adapter 14a is the above-mentioned adapter 14. The first adapter 14a is conductively connected to the first electrode terminal 13a and the electrode assembly 11, and the second adapter 14b is conductively connected to the second electrode terminal 13b and the electrode assembly 11. Among them, the first electrode terminal 13a is the positive electrode terminal 13, and the second electrode terminal 13b is the negative electrode terminal 13; or, the first electrode terminal 13a is the negative electrode terminal 13, and the second electrode terminal 13b is the positive electrode terminal 13.

[0189] The battery cell 10 may further include a first limiting structure 15a, which is the above-mentioned limiting structure 15. The first limiting structure 15a is connected to the second component 122, and is used to limit the first adapter 14a in a direction away from the first component 121. It can be understood that the first adapter 14a is arranged between the second component 122 and the electrode assembly 11, and the first limiting structure 15a is connected to the second component 122, and limits the first adapter 14a in the second component 122 in a direction away from the first component 121 along the first direction Z, so that the electrode assembly 11 is also limited in a direction away from the first component 121 under the drive of the first adapter 14a, which can improve the problem that the electrode assembly 11 collapses toward the first component 121 and reduces or even blocks the first exhaust space 101, thereby improving the directional pressure relief effect of the battery cell 10.

[0190] Among some possible designs, such as Figure 4 As shown, the first electrode terminal 13a and the second electrode terminal 13b are spaced apart in the second component 122, that is, the first electrode terminal 13a and the second electrode terminal 13b are disposed at the same end of the housing assembly 12. Based on this, the first adapter 14a and the second adapter 14b are spaced apart between the electrode assembly 11 and the second component 122.

[0191] Or, in some other possible designs, such as Figure 5 As shown, the first electrode terminal 13a is disposed on the second component 122, and the second electrode terminal 13b is disposed on the first component 121. That is, the first electrode terminal 13a and the second electrode terminal 13b are disposed at opposite ends of the housing component 12. Based on this, the first adapter 14a and the second adapter 14b are located at opposite ends of the electrode component 11, the first adapter 14a is located between the second component 122 and the electrode component 11, and the second adapter 14b is located between the first component 121 and the electrode component 11.

[0192] Such arrangement enables the two electrode terminals 13 of the battery cell 10 to be located at the same end or at two opposite ends.

[0193] In some embodiments, please refer to Figure 4 , Fig.10 and Fig.11 , and combined with other drawings. The second adapter 14b is the above-mentioned adapter 14. The second electrode terminal 13b is also the above-mentioned electrode terminal 13, and the first electrode terminal 13a and the second electrode terminal 13b are arranged at intervals in the second component 122. Based on this, the first adapter 14a and the second adapter 14b are arranged at intervals between the electrode assembly 11 and the second component 122.

[0194] The battery cell 10 may further include a second limiting structure 15b, which is the above-mentioned limiting structure 15. The second limiting structure 15b is connected to the second component 122 at intervals from the first limiting structure 15a, and is used to limit the second adapter 14b in a direction away from the first component 121.

[0195] In this way, the first limiting structure 15a limits the first adapter 14a to the second component 122 in the direction away from the first component 121 along the first direction Z, so that the electrode assembly 11 is also limited in the direction away from the first component 121 along the first direction Z under the drive of the first adapter 14a. In addition, the second limiting structure 15b limits the second adapter 14b to the second component 122 in the direction away from the first component 121 along the first direction Z, so that the electrode assembly 11 is also limited in the direction away from the first component 121 along the first direction Z under the drive of the second adapter 14b. Therefore, the limiting strength of the limiting structure 15 on the electrode assembly 11 can be improved, so that the problem of the electrode assembly 11 collapsing toward the first component 121 and reducing or even blocking the first exhaust space 101 can be greatly improved, thereby improving the directional pressure relief effect of the battery cell 10.

[0196] Specifically, Figure 4 , Figures 8 to 15 As shown, the first electrode terminal 13a and the second electrode terminal 13b are arranged in the second component 122 at intervals along the second direction Y. Correspondingly, the first adapter 14a and the second adapter 14b are also distributed in the housing assembly 12 at intervals along the second direction Y. The second direction Y is perpendicular to the first direction Z.

[0197] in, Figures 8 to 15 , the X axis, Y axis and Z axis are the coordinate axes of the spatial coordinate system, the X axis is perpendicular to the Y axis, the X axis is perpendicular to the Z axis, and the Y axis is perpendicular to the Z axis. The second direction Y is parallel to the Y axis shown in the figure.

[0198] In some embodiments, see Figure 5 , and in combination with other drawings. The first electrode terminal 13a is disposed on the second component 122, and the second electrode terminal 13b is disposed on the first component 121. That is, the first electrode terminal 13a and the second electrode terminal 13b are disposed at opposite ends of the housing component 12. Based on this, the first adapter 14a and the second adapter 14b are located at opposite ends of the electrode component 11, the first adapter 14a is located between the second component 122 and the electrode component 11, and the second adapter 14b is located between the first component 121 and the electrode component 11.

[0199] The second component 122 and the electrode assembly 11 are spaced apart to form a second exhaust space 102 . Specifically, the second component 122 and the electrode assembly 11 are spaced apart along the first direction Z to form the second exhaust space 102 .

[0200] The battery cell 10 further includes a third limiting structure, which is connected to the first component 121 and limits the second adapter 14b to the first component 121. The third limiting structure is connected to the first component 121, and the scheme of how to limit the second adapter 14b to the first component 121 is the same as the scheme of how the limiting structure 15 is connected to the second component 122 and how to limit the adapter 14 to the second component 122, and the specifics can be referred to, and will not be repeated here.

[0201] The second adapter 14b is limited to the first component 121 by the third limiting structure, so that the electrode assembly 11 can be driven by the second adapter 14b to move away from the second component 122. In this way, the problem of the electrode assembly 11 collapsing toward the second component 122 and reducing or even blocking the second exhaust space 102 can be improved, thereby improving the directional pressure relief effect of the battery cell 10.

[0202] It can be understood that the first limiting structure 15a and the third limiting structure are used to achieve the limitation of the electrode assembly 11 in two opposite directions, which can improve the problem of collapse of the electrode assembly 11 leading to reduction or even blockage of the first exhaust space 101 and the second exhaust space 102, thereby facilitating the improvement of the directional pressure relief effect of the battery cell 10.

[0203] In some embodiments, see Figure 5 The second component 122 is provided with a second pressure relief mechanism 17 , and the second exhaust space 102 is connected to the second pressure relief mechanism 17 .

[0204] The second pressure relief mechanism 17 is a pressure relief mechanism capable of releasing the internal pressure of the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a threshold. That is, the second pressure relief mechanism 17 has the same structure as the first pressure relief mechanism 16, and the details can be referred to, and will not be repeated here.

[0205] The second pressure relief mechanism 17 can be arranged on the first wall 1221, such as Figure 5 As shown; the second pressure relief mechanism 17 can also be arranged on the first wall 1221 and the first insulating member 1222 at the same time.

[0206] For example, the second pressure relief mechanism 17 is disposed on the first wall 1221. Figure 5 As shown, the second pressure relief mechanism 17 can be a weak structure provided on the first wall 1221; or, the second pressure relief mechanism 17 can also be a pressure valve, etc. When the second pressure relief mechanism 17 is a weak structure, the structural strength of the second pressure relief mechanism 17 is lower than the structural strength of the end cover and other positions of the shell. In this way, when the battery cell 10 has thermal runaway, the high-temperature and high-pressure gas generated by the battery cell 10 can break through the second pressure relief mechanism 17 to be released outside the battery cell 10.

[0207] As an example, the second pressure relief mechanism 17 can be integrally formed with the first wall 1221. For example, the second pressure relief mechanism 17 is a notch provided on the first wall 1221. As another example, the second pressure relief mechanism 17 can also be separately provided and connected with the first wall 1221.

[0208] The second exhaust space 102 is connected to the second pressure relief mechanism 17, which means that the gas in the second exhaust space 102 can flow to the second pressure relief mechanism 17. As an example, Figure 5 As shown, the second pressure relief mechanism 17 is exposed to the second exhaust space 102 .

[0209] With such arrangement, high-temperature and high-pressure gas generated when the battery cell 10 thermally runs away can flow to the second pressure relief mechanism 17 through the second exhaust space 102 , and be released and directionally relieved through the second pressure relief mechanism 17 , which is beneficial to improving the reliability of the battery 100 .

[0210] Based on this, the high-temperature and high-pressure gas generated when the battery cell 10 is in thermal runaway can be discharged to the first pressure relief mechanism 16 through the first exhaust space 101, and released and directionally relieved through the first pressure relief mechanism 16; it can also be discharged to the second pressure relief mechanism 17 through the second exhaust space 102, and released and directionally relieved through the second pressure relief mechanism 17. In this way, the directional pressure relief effect of the battery cell 10 can be greatly improved.

[0211] See also Figure 2 , and in combination with other drawings. The battery 100 provided in the embodiment of the present application includes a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 in the previous embodiment, which will not be repeated here.

[0212] The battery 100 provided in the embodiment of the present application can improve the directional pressure relief effect of the battery 100 by adopting the battery cell 10 involved above, thereby improving the reliability of the battery 100.

[0213] See also Figure 1 The electric device provided in the embodiment of the present application includes a battery cell 10 or a battery 100. The battery cell 10 and the battery 100 in the present embodiment are the same as the battery cell 10 and the battery 100 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 and the battery 100 in the previous embodiment, which will not be repeated here.

[0214] The electric device provided in the embodiment of the present application can improve the reliability of the battery 100 by adopting the battery cell 10 or the battery 100 involved above, and further improve the reliability of the electric device.

[0215] As one of the embodiments of this application, Figure 4 , Figures 8 to 15 As shown, the battery cell 10 includes a housing assembly 12, an electrode assembly 11, a first electrode terminal 13a, a second electrode terminal 13b, a first adapter 14a, a second adapter 14b, a first limiting structure 15a and a second limiting structure 15b. The housing assembly 12 is provided with a first component 121 and a second component 122 which are arranged opposite to each other along a first direction Z. The first component 121 includes a second wall 1211, and the second wall 1211 is provided with a first pressure relief mechanism 16. The second component 122 includes a first wall 1221 and a first insulating member 1222, the first wall 1221 and the second wall 1211 are arranged opposite to each other along the first direction Z, the first insulating member 1222 is arranged on the side of the first wall 1221 facing the second wall 1211 along the first direction Z, and the first wall 1221 is an end cover. The second wall 1211 and the electrode assembly 11 are spaced along the first direction Z to form a first exhaust space 101, and the first pressure relief mechanism 16 is exposed to the first exhaust space 101. The first electrode terminal 13a and the second electrode terminal 13b are spaced apart on the first wall 1221, the first adapter 14a and the second adapter 14b are spaced apart in the housing assembly 12, and the first adapter 14a is conductively connected to the first electrode terminal 13a and the positive electrode tab of the electrode assembly 11, and the second adapter 14b is conductively connected to the second electrode terminal 13b and the negative electrode tab of the electrode assembly 11. The first limiting structure 15a and the second limiting structure 15b are spaced apart on the second component 122. At least a portion of the first limiting structure 15a is located on a side of the first adapter 14a along the first direction Z toward the first component 121 to limit the first adapter 14a. At least a portion of the second limiting structure 15b is located on a side of the second adapter 14b along the first direction Z toward the first component 121 to limit the second adapter 14b.

[0216] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A housing assembly includes a first component and a second component that are arranged opposite to each other; An electrode assembly is disposed between the first component and the second component, and the first component and the electrode assembly are spaced apart to form a first exhaust space; a first pressure relief mechanism, disposed on the first component and connected to the first exhaust space; an electrode terminal, disposed on the second component; A transition piece, conductively connected to the electrode assembly and the electrode terminal; The limiting structure is connected to the second component and is used to limit the adapter in a direction away from the first component.

2. The battery cell according to claim 1, characterized in that: The second component comprises: a first wall, disposed opposite to the first component; The first insulating member is arranged between the first wall and the electrode assembly, and the adapter is arranged on a side of the first insulating member away from the first wall; the limiting structure is connected to the first wall and / or the first insulating member.

3. The battery cell according to claim 1, characterized in that: The limiting structure comprises: a first limiting member connected to the second member; The second limiting member is connected to the first limiting member and is at least partially located on a side of the adapter member facing the first component to limit the adapter member.

4. The battery cell according to claim 3, characterized in that: The first limiting member and the second limiting member are integrally connected; or, the first limiting member and the second limiting member are detachably connected.

5. The battery cell according to claim 3, characterized in that: At least one of the limiting structures constitutes a group of the limiting structures, and a group of the limiting structures is used to limit one of the adapters; the sizes of the limiting structures and the adapter satisfy the following relationship: 0.002<S1 / S2<0.4; Among them, S1 is the projection area of ​​all the second limiting members of a group of the limiting structures projected onto the adapter along the first direction, and S2 is the projection area of ​​one of the adapters along the first direction; the first direction is parallel to the distribution direction of the first components and the second components.

6. The battery cell according to claim 5, characterized in that: 0.07<S1 / S2<0.

3.

7. The battery cell according to claim 3, characterized in that: The second component comprises: a first wall, disposed opposite to the first component; A first insulating member is disposed between the first wall and the electrode assembly, and the adapter is disposed on a side of the first insulating member away from the first wall; Among them, the first limiting member is plugged into the first insulating member and the first wall in sequence; or, the first limiting member is passed through the first insulating member or plugged into the first insulating member and connected to the first wall; or, the first limiting member is connected to the first insulating member; or, the first limiting member is plugged into the first insulating member.

8. The battery cell according to claim 3, characterized in that: The limiting structure includes a plurality of the first limiting members spaced apart and distributed on the second component, and opposite ends of at least some of the second limiting members are respectively connected to corresponding first limiting members.

9. The battery cell according to claim 8, characterized in that: The first limiting member includes a first connecting portion connected to the second component and a first hook portion arranged on the first connecting portion, and the second limiting member includes a second connecting portion and a second hook portion arranged on the second connecting portion, and the first hook portion and the second hook portion are engaged with each other to form the limiting of the first limiting member and the second limiting member in the distribution direction of the first component and the second component.

10. The battery cell according to any one of claims 1 to 6, characterized in that: The second component is provided with a groove, and at least a portion of the adapter is disposed in the groove; the limiting structure is disposed on the inner wall of the groove, and limits the adapter in the groove.

11. The battery cell according to any one of claims 1 to 9, characterized in that: The battery cell comprises: a first electrode terminal, which is the electrode terminal and is disposed on the second component; A second electrode terminal is provided on the first component or the second component; A first adapter, which is the adapter and is conductively connected to the first electrode terminal and the electrode assembly; a second adapter, conductively connected to the second electrode terminal and the electrode assembly; The first limiting structure is the limiting structure, and is connected to the second component and is used to limit the first adapter along a direction away from the first component.

12. The battery cell according to claim 11, characterized in that: The second adapter is the adapter; the second electrode terminal is the electrode terminal, and is spaced apart from the first electrode terminal and arranged in the second component; The battery cell further includes a second limiting structure, which is spaced apart from the first limiting structure and connected to the second component. The second limiting structure is the limiting structure and is used to limit the second adapter in a direction away from the first component.

13. The battery cell according to claim 11, characterized in that: The second electrode terminal is disposed on the first component, and the second component and the electrode assembly are spaced apart to form a second exhaust space; the second component is provided with a second pressure relief mechanism connected to the second exhaust space; The battery cell further includes a third limiting structure, which is connected to the first component and is used to limit the second adapter in a direction away from the second component.

14. A battery, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 13.

15. An electrical device, characterized in that: Comprising a battery cell according to any one of claims 1 to 13; or comprising a battery according to claim 14.

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