Battery cell, battery, and electric device

Abstract

A battery cell (20), a battery (100), and an electric device, relating to the technical field of batteries. The battery cell (20) comprises a casing (21), electrode assemblies (22), and a pressure relief mechanism (23). The casing (21) comprises a wall portion (211). The electrode assemblies (22) are accommodated in the casing (21). The pressure relief mechanism (23) is arranged on the wall portion (211), and the pressure relief mechanism (23) is configured to release the internal pressure from the battery cell (20). The wall portion (211) has a first surface (2111) facing the electrode assemblies (22); abutting portions (2112) protrude from the first surface (2111); along a thickness direction (X) of the wall portion (211), the abutting portions (2112) abut against the electrode assemblies (22), so that an exhaust channel (24) is formed between the electrode assemblies (22) and the first surface (2111); and the exhaust channel (24) is configured to guide the gas inside the casing (21) to the pressure relief mechanism (23). The battery cell (20) can mitigate the phenomenon of the electrode assemblies (22) blocking or clogging the pressure relief mechanism (23), so as to enhance the internal exhaust smoothness of the battery cell (20) during thermal runaway, such that the pressure relief rate of the battery cell (20) can be increased, thereby facilitating reduction of the risk of explosion or bursting of the battery cell (20) caused by untimely pressure relief, improving the operational reliability of the battery cell (20).

Description

Battery cell, battery and electric device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 2024211742146, filed May 27, 2024, entitled “Battery cell, battery and electric device,” the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0004] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing, among which, batteries as core components of new energy vehicles have higher requirements in terms of use reliability.

[0005] In the battery technology, in order to ensure the safety of the battery cell, a pressure relief mechanism for relieving the internal pressure of the battery cell is generally provided on the shell of the battery cell, so that when the battery cell is in thermal runaway, the pressure relief mechanism can be actuated and relieve the internal pressure of the battery cell. However, the existing battery cell has a low pressure relief rate when it is in thermal runaway, which causes the battery cell to be at risk of explosion or bursting due to untimely pressure relief, thereby resulting in low use reliability of the battery cell.

[0006] SUMMARY

[0007] The embodiments of the present application provide a battery cell, a battery and an electric device, which can effectively improve the use reliability of the battery cell.

[0008] In a first aspect, the embodiments of the present application provide a battery cell, comprising a shell, an electrode assembly and a pressure relief mechanism; the shell has a wall portion; the electrode assembly is contained in the shell; the pressure relief mechanism is arranged on the wall portion, and the pressure relief mechanism is configured to relieve the internal pressure of the battery cell; wherein the wall portion has a first surface facing the electrode assembly, the first surface is provided with an abutting portion, and along the thickness direction of the wall portion, the abutting portion abuts against the electrode assembly, so that an exhaust passage is formed between the electrode assembly and the first surface, and the exhaust passage is configured to guide the gas inside the shell to the pressure relief mechanism.

[0009] In the technical solution, the abutting portion is protruded on the first surface of the wall portion facing the electrode assembly, and the abutting portion can abut against the electrode assembly in the thickness direction of the wall portion. The abutting portion can support the electrode assembly to form an exhaust passage between the electrode assembly and the first surface, so that the electrode assembly is spaced apart from the pressure relief mechanism. When the battery monomer is in thermal runaway, the thermal runaway gas in the shell can be guided to the pressure relief mechanism through the exhaust passage. When the pressure relief mechanism releases the internal pressure of the battery monomer, the phenomenon that the electrode assembly blocks or blocks the pressure relief mechanism is effectively alleviated. The internal exhaust of the battery monomer in thermal runaway is smooth, and the pressure relief rate of the battery monomer is effectively improved. The risk of explosion or burst of the battery monomer due to untimely pressure relief is reduced, and the use reliability of the battery monomer is improved.

[0010] In some embodiments, in a plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the abutting portion does not overlap the orthographic projection of the pressure relief mechanism.

[0011] In the technical solution, the orthographic projections of the abutting portion and the pressure relief mechanism in a plane perpendicular to the thickness direction of the wall portion are arranged to be mutually non-overlapping. The abutting portion does not cover or block the pressure relief mechanism, so that the phenomenon that the abutting portion blocks or blocks the pressure relief mechanism is effectively alleviated. The exhaust of the battery monomer in thermal runaway is smooth, and the pressure relief rate of the battery monomer is improved.

[0012] In some embodiments, the first surface protrudes a plurality of abutting portions, and the plurality of abutting portions are arranged at intervals.

[0013] In the technical solution, a plurality of abutting portions are protruded on the first surface, and the plurality of abutting portions are arranged at intervals. The effect of separating the electrode assembly and the pressure relief mechanism is improved, and the gas in the shell can pass through the gap between the plurality of abutting portions. The phenomenon that the abutting portion blocks the gas in the shell is reduced, and the internal exhaust of the battery monomer in thermal runaway is effectively improved.

[0014] In some embodiments, the plurality of abutting portions are arranged around the pressure relief mechanism.

[0015] In the technical solution, the plurality of abutting portions are arranged around and at intervals on the outer circumferential side of the pressure relief mechanism. The effect of separating the electrode assembly and the pressure relief mechanism is further improved, the phenomenon that the electrode assembly blocks or blocks the pressure relief mechanism is further alleviated, and the risk of explosion or burst of the battery monomer due to untimely pressure relief is reduced. The use reliability of the battery monomer is improved.

[0016] In some embodiments, the battery monomer includes a plurality of electrode assemblies, and each electrode assembly abuts against at least one abutting portion in the thickness direction of the wall portion.

[0017] In the technical solution, the shell of the battery monomer contains multiple electrode assemblies, and each electrode assembly is in abutment with at least one abutment part, so that the capacity of the battery monomer is improved, and each electrode assembly is spaced apart from the pressure relief mechanism in the thickness direction of the wall part, so that the phenomenon of the multiple electrode assemblies blocking or plugging the pressure relief mechanism is alleviated when the pressure relief mechanism releases the internal pressure of the battery monomer, and the pressure relief effect and the pressure relief rate of the battery monomer are improved, thereby improving the use reliability of the battery monomer.

[0018] In some embodiments, the multiple electrode assemblies are stacked along a first direction; the first surface protrudes with multiple rows of abutment parts arranged along the first direction, each row of abutment parts includes multiple abutment parts arranged along a second direction, the first direction, the second direction and the thickness direction of the wall part are perpendicular to each other; and along the thickness direction of the wall part, the multiple abutment parts in each row of abutment parts are in abutment with one electrode assembly.

[0019] In the technical solution, the multiple electrode assemblies are stacked along a first direction; the first surface protrudes with multiple rows of abutment parts arranged along the first direction, each row of abutment parts includes multiple abutment parts arranged along a second direction, the first direction, the second direction and the thickness direction of the wall part are perpendicular to each other; and along the thickness direction of the wall part, the multiple abutment parts in each row of abutment parts are in abutment with one electrode assembly.

[0020] In some embodiments, along the thickness direction of the wall part, the end of the electrode assembly in abutment with the abutment part is formed with a protrusion, and the protrusion is in contact with the wall part.

[0021] In the technical solution, the protrusion is provided on the end of the electrode assembly in abutment with the abutment part, and the protrusion is in contact with the wall part. On the one hand, the contact area between the electrode assembly and the shell is increased, which is beneficial to improve the heat dissipation effect of the battery monomer. On the other hand, the contact area between the electrode assembly and the electrolyte contained in the shell is increased, and the electrode assembly can contact the electrolyte deposited on the wall part, thereby improving the effect of the electrode assembly being soaked by the electrolyte, and further improving the use performance of the battery monomer.

[0022] In some embodiments, in a plane perpendicular to the thickness direction of the wall part, the orthographic projection of the protrusion does not overlap with the orthographic projection of the pressure relief mechanism.

[0023] In the technical solution, the protrusion of the electrode assembly and the relief mechanism are arranged not to overlap in the vertical direction of the thickness of the wall, so that the protrusion of the electrode assembly does not cover or block the relief mechanism, thereby effectively alleviating the phenomenon that the protrusion of the electrode assembly blocks or clogs the relief mechanism, improving the smoothness of the battery cell when thermal runaway occurs, and facilitating the improvement of the relief rate of the battery cell.

[0024] In some embodiments, the electrode assembly includes first and second polar plates with opposite polarities, and at least one of the first and second polar plates is formed with a protrusion.

[0025] In the technical solution, the protrusion is formed in at least one of the first and second polar plates of the electrode assembly, so that the first and / or second polar plate is partially protruding, thereby facilitating the increase of the energy density of the battery cell.

[0026] In some embodiments, the abutting portion is integrally formed with the wall.

[0027] In the technical solution, the abutting portion and the wall are integrally formed, i.e., the abutting portion and the wall are an integral structure, thereby facilitating the improvement of the stability and reliability of the structure of the abutting portion protruding on the first surface, alleviating the phenomenon of the abutting portion falling off during use, and thereby facilitating the improvement of the use stability of the battery cell.

[0028] In some embodiments, along the thickness direction of the wall, the second surface of the wall away from the electrode assembly is formed with a groove corresponding to the position of the abutting portion.

[0029] In the technical solution, the groove is formed on the second surface of the wall away from the electrode assembly and corresponding to the position of the abutting portion, so that the abutting portion of the wall is a structure that can be formed by stamping, facilitating the reduction of the difficulty of protruding the abutting portion on the first surface of the wall, thereby reducing the manufacturing difficulty of the battery cell, and improving the production efficiency of the battery cell.

[0030] In some embodiments, the abutting portion is separately provided from the wall and connected to the first surface.

[0031] In the technical solution, the abutting portion and the wall are separately provided, i.e., the abutting portion and the wall are a separate structure, and the abutting portion is connected to the first surface of the wall, so that the battery cell with this structure can reduce the difficulty of forming the abutting portion on the first surface, thereby reducing the manufacturing difficulty of the battery cell, and improving the production efficiency of the battery cell.

[0032] In some embodiments, the shell comprises a shell body and an end cover; the shell body comprises a first wall and a second wall which are integrally formed, the first wall is arranged around the second wall, one end of the first wall is connected to the second wall in the thickness direction of the wall, and the other end of the first wall is closed to form an opening, and the first wall and the second wall jointly define a receiving cavity for accommodating the electrode assembly; the end cover closes the opening; and the second wall is the wall.

[0033] In the above technical solution, by arranging the wall of the shell as the second wall of the shell body opposite to the end cover in the thickness direction of the wall, the battery monomer with this structure can make the wall equipped with the pressure relief mechanism away from the end cover, so that there is no direct connection relationship between the wall and the end cover, thereby relieving the stress generated when the shell body and the end cover are assembled and connected from acting on the pressure relief mechanism, reducing the risk of damage or structural strength reduction of the pressure relief mechanism, and further relieving the phenomenon of premature actuation of the pressure relief mechanism, thereby improving the service life and use reliability of the battery monomer.

[0034] In some embodiments, the shell comprises a shell body and an end cover; the shell body comprises a first wall and a second wall which are integrally formed, the first wall is arranged around the second wall, one end of the first wall is connected to the second wall in the thickness direction of the wall, and the other end of the first wall is closed to form an opening, and the first wall and the second wall jointly define a receiving cavity for accommodating the electrode assembly; the end cover closes the opening; and the second wall is the wall.

[0035] In the above technical solution, by arranging the wall of the shell as the second wall of the shell body opposite to the end cover in the thickness direction of the wall, the battery monomer with this structure can make the wall equipped with the pressure relief mechanism away from the end cover, so that there is no direct connection relationship between the wall and the end cover, thereby relieving the stress generated when the shell body and the end cover are assembled and connected from acting on the pressure relief mechanism, reducing the risk of damage or structural strength reduction of the pressure relief mechanism, and further relieving the phenomenon of premature actuation of the pressure relief mechanism, thereby improving the service life and use reliability of the battery monomer.

[0036] In a second aspect, the embodiments of the present application also provide a battery comprising the above battery monomer.

[0037] In some embodiments, in the thickness direction of the wall, the wall has a second surface facing away from the electrode assembly, and a groove is formed in the second surface corresponding to the position of the abutting portion; wherein the battery comprises a fixing member, the fixing member has a third surface facing the second surface in the thickness direction of the wall, and the third surface is provided with a clamping portion, and the clamping portion is inserted and matched with the groove.

[0038] In the technical scheme, the abutting portion on the wall portion is a structure formed by stamping, facilitating processing and manufacturing, and reducing the difficulty of forming the abutting portion on the first surface of the wall portion. In addition, the clamping portion is inserted into the groove on the wall portion to fasten and position the battery monomer, thereby improving the structural stability and reliability of the battery monomer assembled into the battery, reducing the phenomenon of shaking or shifting of the battery monomer during use, and effectively reducing the risk of displacement or collision of the battery monomer with other components, thereby improving the use stability and service life of the battery.

[0039] In some embodiments, the second surface is formed with a plurality of grooves, and the third surface is provided with a plurality of clamping portions, each clamping portion being inserted into a groove.

[0040] In the technical scheme, a plurality of grooves are provided on the second surface of the wall portion, and a plurality of clamping portions are provided on the third surface of the fixing member, so that each clamping portion is inserted into a groove, and the battery monomer is assembled by the plurality of grooves on the wall portion and the plurality of clamping portions of the fixing member, thereby further improving the effect of fastening and positioning the battery monomer, further reducing the phenomenon of shaking or shifting of the battery monomer during use, and further reducing the risk of displacement or collision of the battery monomer with other components, thereby improving the use stability and service life of the battery.

[0041] In some embodiments, the second surface and the third surface abut.

[0042] In the technical scheme, the second surface of the wall portion and the third surface of the fixing member abut each other, so that the wall portion is a structure abutting on the fixing member, thereby further improving the assembly stability between the battery monomer and the fixing member, and improving the effect of the clamping portion and the groove being inserted into each other. In addition, by arranging the second surface of the wall portion and the third surface of the fixing member to abut each other, the size of the gap between the battery monomer and the fixing member can be reduced, thereby saving the space occupied by the battery monomer and the fixing member in the thickness direction of the wall portion, and improving the internal space utilization of the battery.

[0043] In some embodiments, the fixing member is internally formed with an exhaust cavity, and the third surface is provided with a pressure relief opening communicating with the exhaust cavity; wherein, along the thickness direction of the wall portion, the pressure relief mechanism is arranged opposite to the pressure relief opening.

[0044] In the technical scheme, the inner part of the fixing member is further provided with an exhaust cavity, and the third surface of the fixing member is provided with a pressure relief port in communication with the exhaust cavity. By arranging the pressure relief mechanism of the battery monomer to be opposite to the pressure relief port in the thickness direction of the wall part, the gas discharged by the pressure relief mechanism when the battery monomer is in thermal runaway can directly enter the exhaust cavity through the pressure relief port and be discharged through the exhaust cavity. The battery with such a structure can reduce the assembly difficulty of the battery and the manufacturing cost of the battery, improve the exhaust smoothness of the pressure relief mechanism arranged on the wall part, and reduce the risk of explosion or burst of the battery monomer due to delayed pressure relief, thereby improving the use reliability of the battery.

[0045] In some embodiments, the projection of the pressure relief mechanism in the thickness direction of the wall part is located in the pressure relief port.

[0046] In the technical scheme, by arranging the projection of the pressure relief mechanism in the thickness direction of the wall part to be located in the pressure relief port, the pressure relief port can receive the gas discharged by the pressure relief mechanism at any position, thereby further improving the exhaust smoothness of the pressure relief mechanism arranged on the wall part and further improving the pressure relief rate of the battery monomer.

[0047] In some embodiments, the inner part of the fixing member is formed with a flow channel for accommodating a heat exchange medium configured to exchange heat with the battery monomer.

[0048] In the technical scheme, the inner part of the fixing member is further provided with a flow channel, so that the flow channel of the fixing member can accommodate a heat exchange medium for heat exchange with the battery monomer, so that the fixing member can also function to manage the temperature of the battery monomer. The battery with such a structure can integrate the heat management component for managing the temperature of the battery monomer on the fixing member, thereby reducing the assembly difficulty of the battery and the manufacturing cost of the battery. In addition, in the structure in which the clamping part of the fixing member is inserted into the groove of the wall part, the contact area between the battery monomer and the fixing member can be increased, thereby increasing the heat exchange area between the battery monomer and the fixing member and improving the effect of the fixing member on managing the temperature of the battery monomer.

[0049] In some embodiments, the fixing member has a third surface on both sides in the thickness direction of the wall portion, and the battery monomers are arranged on both sides of the fixing member, and the second surfaces of the battery monomers on both sides of the fixing member face the arrangement.

[0050] In the above technical solution, the fixing member has a third surface on both sides in the thickness direction of the wall portion, so that the battery monomers can be arranged on both sides of the fixing member, and the fixing member can fix and limit the battery monomers on both sides of the fixing member, thereby realizing that the battery monomers on both sides of the fixing member share one fixing member, which can save the manufacturing cost of the battery, reduce the assembly difficulty of the battery, optimize the internal space of the battery, and improve the utilization rate of the internal space of the battery.

[0051] In some embodiments, the battery comprises a plurality of battery monomers arranged in a stacking manner along a first direction, and the first direction is perpendicular to the thickness direction of the wall portion; wherein, along the thickness direction of the wall portion, the second surfaces of the plurality of battery monomers are arranged to face the third surface, and the third surface protrudes a clamping portion corresponding to each battery monomer.

[0052] In the above technical solution, the battery is provided with a plurality of battery monomers arranged in a stacking manner along a first direction, and the third surface of the fixing member protrudes a clamping portion corresponding to each battery monomer, so that the plurality of battery monomers share one fixing member, and the plurality of battery monomers are fastened on one fixing member. The battery with this structure can save the manufacturing cost of the battery, reduce the assembly difficulty of the battery, optimize the internal space of the battery, reduce the change of the interval between adjacent two battery monomers in the first direction when the battery monomers expand in the first direction, absorb and share the torque or tension of the current collecting component connected between adjacent two battery monomers through the fixing member, thereby reducing the pulling phenomenon between the battery monomers and the current collecting component, reducing the risk of electrical connection failure between the battery monomers, and improving the use stability and service life of the battery.

[0053] In some embodiments, along the first direction, the shell has two opposite fourth surfaces, the fourth surface is the largest surface among the outer surfaces of the shell, and the fourth surface is perpendicular to the first direction.

[0054] In the above technical solution, the fourth surface, which is the largest surface among the outer surfaces of the shell, is arranged to be perpendicular to the first direction, so that the plurality of battery monomers are arranged in a stacking manner along the thickness direction of the battery monomer, and the fixing member can also constrain and limit the battery monomers in the direction of the largest expansion, thereby alleviating the pulling phenomenon between the battery monomers and the current collecting component in the direction of the largest expansion of the battery monomers, and further reducing the risk of electrical connection failure between the battery monomers.

[0055] In some embodiments, the battery further comprises a box body, an assembly space is formed in an interior of the box body, the battery cell and the fixing member are both accommodated in the assembly space, and the fixing member is connected with the box body; wherein the box body comprises a first box body and a second box body arranged along a first direction, and the first box body and the second box body are mutually overlapped and jointly define the assembly space.

[0056] In the above technical solution, by arranging the first box body and the second box body opposite to each other along the first direction and mutually overlapped, the arrangement direction of the first box body and the second box body is the same as the stacking direction of the plurality of battery cells, so that the plurality of battery cells arranged along the first direction can be arranged in a flat manner in the box body, on the one hand, facilitating assembly and being conducive to reducing the difficulty of assembling the battery cell in the box body, and on the other hand, the fixing member can constrain and limit the plurality of battery cells in the direction of maximum expansion, so as to alleviate the pulling phenomenon of the battery cell and the current collecting component in the direction of maximum expansion of the battery cell.

[0057] In a third aspect, the embodiments of the present application further provide a power utilization device comprising the battery cell or the battery described above, and the battery cell is used to provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0059] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0060] FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

[0061] FIG. 3 is a structural schematic diagram of a battery cell according to some embodiments of the present application;

[0062] FIG. 4 is an exploded view of a battery cell according to some embodiments of the present application;

[0063] FIG. 5 is a sectional view of a battery cell according to some embodiments of the present application;

[0064] FIG. 6 is a front view of a shell of a housing facing a first surface in a thickness direction of a wall portion according to some embodiments of the present application;

[0065] FIG. 7 is a partial sectional view of a shell of a housing according to some embodiments of the present application;

[0066] Figure 8 is a front view of the housing of the outer casing provided in some embodiments of this application, facing the second surface in the thickness direction of the wall portion;

[0067] Figure 9 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0068] Figure 10 is an assembly diagram of the battery cell and the fastener provided in some embodiments of this application;

[0069] Figure 11 is a schematic diagram of the structure of the battery fixing component provided in some embodiments of this application;

[0070] Figure 12 is a cross-sectional view of a battery holder provided in some embodiments of this application.

[0071] Icons: 1000 - Vehicle; 100 - Battery; 10 - Housing; 11 - First Housing Body; 12 - Second Housing Body; 20 - Battery Cell; 21 - Shell; 211 - Wall; 2111 - First Surface; 2112 - Abutting Part; 2113 - Second Surface; 2114 - Groove; 212 - Housing; 2121 - Receiving Cavity; 2122 - Opening; 213 - End Cap; 214 - Fourth Surface; 22 - Electrode Assembly; 221 - First Tab; 222 - Second Tab; 223 - Protrusion; 23 - Pressure Relief Mechanism; 24 - Exhaust Channel; 25 - Electrode Terminal; 26 - Current Collector; 30 - Fixing Member; 31 - Third Surface; 32 - Snap-fit ​​Part; 33 - Exhaust Chamber; 34 - Pressure Relief Port; 35 - Flow Channel; 200 - Controller; 300 - Motor; X - Thickness Direction of Wall; Y - First Direction; Z - Second Direction. Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0073] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0074] Reference to "an embodiment" or "the embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment.

[0075] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be directly connected, or indirectly connected through intermediate medium, it can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0076] In this application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0077] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the application.

[0078] "Multiple" appearing in this application means more than two (including two).

[0079] In the embodiments of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0080] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the application are not limited in this regard.

[0081] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0082] In some embodiments, the cathode can be a cathode sheet, which can include a cathode current collector and a cathode active material disposed on at least one surface of the cathode current collector.

[0083] As an example, the cathode current collector has two surfaces opposite in the thickness direction thereof, and the cathode active material is disposed on either one or both of the two opposite surfaces of the cathode current collector.

[0084] As an example, the cathode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0085] As an example, the cathode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery cathode active material can also be used. These cathode active materials can be used alone only one or two or more thereof can be used in combination. As an example of the lithium-containing phosphate, at least one of lithium iron phosphate (such as LiFeP04(also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon can be included, but is not limited thereto. As an example of the lithium transition metal oxide, at least one of lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2(also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2(also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2(also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2O2(also can be referred to as NCM 622 LiNi 0.8 Co 0.1 Mn 0.1 O2(also can be referred to as NCM 811 LiNi 0.85 Co 0.15 Al 0.05 O2) and modified compounds thereof.

[0086] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. When the foam metal is used as the positive electrode, the foam metal surface can not be provided with the positive electrode active material, or of course can be provided with the positive electrode active material. As an example, the foam metal can be filled or / and deposited with a lithium source material, a potassium metal or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0087] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0088] As an example, the negative electrode current collector can employ a metal foil, a foam metal or a composite current collector. For example, as the metal foil, silver surface treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, nickel or titanium, or the like can be employed. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0089] As an example, the negative electrode sheet can include the negative electrode current collector and the negative electrode active material provided on at least one surface of the negative electrode current collector.

[0090] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector.

[0091] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative active material can also be used. These negative active materials can be used alone or in combination of two or more.

[0092] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0093] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0094] In some embodiments, the separator is a separator film. The separator film can be of various types, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0095] As an example, the material of the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0096] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive and negative electrodes.

[0097] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0098] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium boric oxalate, lithium difluoroboric dioxalate, and lithium tetrafluorophosphoric oxalate.

[0099] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from ether solvents. The ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0100] In some embodiments, the gel electrolyte includes a polymer as a skeleton network of the electrolyte, and an ionic liquid-lithium salt.

[0101] In some embodiments, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0102] As an example, the polymer solid electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, or the like.

[0103] As an example, the inorganic solid electrolyte can include one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), and a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0104] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0105] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0106] In some embodiments, the electrode assembly is a stacked structure.

[0107] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0108] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked, and one positive electrode sheet can be interposed between adjacent folded segments.

[0109] As an example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded segments that are stacked.

[0110] As an example, the separators can be provided in plurality, each provided between any adjacent positive electrode sheet or negative electrode sheet.

[0111] As an example, the separators can be provided in plurality, each provided between any adjacent positive electrode sheet or negative electrode sheet.

[0112] In some embodiments, the electrode assembly can have a shape of a cylinder, a flat, a polygonal prism, or the like.

[0113] In some embodiments, the electrode assembly can be provided with tabs, which can lead current out of the electrode assembly. The tabs can include positive tabs and negative tabs.

[0114] In some embodiments, the battery cell can include a housing. The housing can be used to enclose components such as the electrode assembly and the electrolyte. The housing can be a steel case, an aluminum case, a plastic case (e.g., polypropylene), a composite metal case (e.g., a copper-aluminum composite case), an aluminum-plastic film, or the like.

[0115] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, including but not limited to a square battery cell, a blade battery cell, a polygonal prism battery cell (e.g., a hexagonal prism battery cell), or the like.

[0116] A battery as referred to in embodiments of the present application can refer to a single physical module that includes one or more battery cells to provide a higher voltage and capacity.

[0117] In some embodiments, the battery can be a battery module, in which a plurality of battery cells are arranged and fixed to form a battery module.

[0118] In some embodiments, the battery can be a battery pack, which includes a box and battery cells, and the battery cells or battery modules are contained in the box.

[0119] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, part of the box can be at least part of a floor of the vehicle, or part of the box can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0120] In some embodiments, the battery can be an energy storage device. The energy storage device can include an energy storage container, an energy storage cabinet, or the like.

[0121] Batteries possess outstanding advantages such as high energy density, low environmental pollution, high power density, long lifespan, wide applicability, and low self-discharge coefficient, making them a crucial component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, battery safety must also be taken into account.

[0122] For a typical battery cell, it usually consists of a casing and electrode assemblies housed within the casing. The casing typically includes a pressure relief mechanism that can rupture in the event of thermal runaway to release internal pressure. During use, the electrode assemblies are highly susceptible to coming into contact with and covering the pressure relief mechanism, especially in structures where the mechanism is located at the bottom of the battery cell, below the electrode assemblies. In the event of thermal runaway, the electrode assemblies can easily block the pressure relief mechanism, hindering pressure release. This results in a lower pressure release rate during thermal runaway, increasing the risk of explosion or rupture due to delayed pressure release, thus negatively impacting the reliability of the battery cell.

[0123] Based on the above considerations, in order to solve the problem of low reliability in the use of individual battery cells, embodiments of this application provide a battery cell including a casing, an electrode assembly, and a pressure relief mechanism. The casing has a wall. The electrode assembly is housed within the casing. The pressure relief mechanism is disposed in the wall and configured to release the internal pressure of the battery cell. The wall has a first surface facing the electrode assembly, and the first surface has a protruding abutment portion that abuts against the electrode assembly along the thickness direction of the wall, thereby forming an exhaust channel between the electrode assembly and the first surface. The exhaust channel is configured to guide gas inside the casing to the pressure relief mechanism.

[0124] In this type of battery cell, a protruding abutment portion is provided on the first surface of the wall facing the electrode assembly. This abutment portion allows the electrode assembly to abut against the wall in the thickness direction. The support of the abutment portion enables the formation of an exhaust channel between the electrode assembly and the first surface. This allows the electrode assembly and the pressure relief mechanism to be arranged at intervals. When the battery cell experiences thermal runaway, the exhaust channel can guide the thermal runaway gas inside the casing to the pressure relief mechanism. This effectively alleviates the phenomenon of the electrode assembly blocking or clogging the pressure relief mechanism when the pressure relief mechanism releases the internal pressure of the battery cell, thereby improving the smoothness of internal exhaust when the battery cell experiences thermal runaway. This effectively increases the pressure relief rate of the battery cell, which helps to reduce the risk of explosion or bursting caused by untimely pressure relief, thus improving the reliability of the battery cell.

[0125] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and batteries disclosed in this application. This helps to mitigate the problem of battery cells exploding or bursting due to untimely pressure release, thereby improving the reliability of the battery cells.

[0126] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0127] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0128] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is installed inside the vehicle 1000. The battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0129] In some embodiments of this application, the battery 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0130] Please refer to Figures 2 and 3. Figure 2 is an exploded view of the battery 100 provided in some embodiments of this application, and Figure 3 is a schematic diagram of the battery cell 20 provided in some embodiments of this application. The battery 100 includes a housing 10 and a battery cell 20, which is housed within the housing 10.

[0131] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0132] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in Figure 2, the shape of the box 10 is a cuboid.

[0133] In battery 100, there can be one or more battery cells 20 disposed within housing 10. When there are multiple battery cells 20 disposed within housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of multiple battery cells 20 is housed within housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within housing 10.

[0134] In some embodiments, the battery 100 may also include other structures. For example, the battery 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0135] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in Figure 3, the battery cell 20 has a cuboid structure.

[0136] According to some embodiments of this application, referring to FIG3, and further referring to FIG4, 5, 6 and 7, FIG4 is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application, FIG5 is a cross-sectional view of a battery cell 20 provided in some embodiments of this application, FIG6 is a front view of the housing 212 of the outer casing 21 provided in some embodiments of this application facing the first surface 2111 in the thickness direction X of the wall portion, and FIG7 is a partial cross-sectional view of the housing 212 of the outer casing 21 provided in some embodiments of this application. This application provides a battery cell 20, which includes an outer casing 21, an electrode assembly 22 and a pressure relief mechanism 23. The outer casing 21 has a wall portion 211. The electrode assembly 22 is housed within the outer casing 21. The pressure relief mechanism 23 is disposed on the wall portion 211 and is configured to release the internal pressure of the battery cell 20. The wall portion 211 has a first surface 2111 facing the electrode assembly 22. The first surface 2111 has a protruding abutment portion 2112. Along the thickness direction X of the wall portion, the abutment portion 2112 abuts against the electrode assembly 22, so that an exhaust channel 24 is formed between the electrode assembly 22 and the first surface 2111. The exhaust channel 24 is configured to guide the gas inside the housing 21 to the pressure relief mechanism 23.

[0137] The outer shell 21 can also be used to contain electrolytes, such as electrolyte solutions. The outer shell 21 can have various structural forms. The outer shell 21 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0138] In some embodiments, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity 2121 with an opening 2122. That is, the housing 212 is a hollow structure with one end open. The end cap 213 covers the opening 2122 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0139] Optionally, the housing 212 includes an integrally formed first wall and a second wall, the first wall surrounding the second wall, one end of the first wall being connected to the second wall, and the other end forming an opening 2122, and an end cap 213 covering the opening 2122 and disposed opposite to the second wall.

[0140] It should be noted that the wall portion 211 with the pressure relief mechanism 23 can be the end cap 213 of the outer shell 21, or it can be one of the multiple walls of the housing 212. For example, in Figures 4 and 5, the wall portion 211 is the second wall of the housing 212 that is disposed opposite to the end cap 213 in the thickness direction X of the wall portion. Correspondingly, the thickness direction X of the wall portion is the arrangement direction of the end cap 213 and the wall portion 211, and also the thickness direction of the end cap 213. Of course, in other embodiments, the wall portion 211 can also be the end cap 213 of the outer shell 21, or it can be the first wall of the housing 212 that is adjacent to and abuts against the end cap 213.

[0141] When assembling the battery cell 20, the electrode assembly 22 can be placed into the housing 212 first, and the electrolyte can be filled into the housing 212. Then, the end cap 213 can be placed on the opening 2122 of the housing 212 to close the opening 2122 of the housing 212.

[0142] The housing 212 can have various shapes, such as a cylinder or a cuboid. The shape of the housing 212 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, then the housing 212 can be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, then the housing 212 can be a cuboid structure. Of course, the end cap 213 can also have various structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figures 3 and 4, the housing 212 is a cuboid structure.

[0143] Understandably, the housing 21 is not limited to the structure described above. The housing 21 can also be other structures. For example, the housing 21 includes a shell 212 and two end caps 213. The shell 212 is a hollow structure with openings 2122 on opposite sides. One end cap 213 is fitted onto one opening 2122 of the shell 212 to form a sealed connection, thereby forming a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0144] In this embodiment, the pressure relief mechanism 23 is disposed on the wall portion 211, and the pressure relief mechanism 23 is configured to release the internal pressure of the battery cell 20. That is, the pressure relief mechanism 23 is used to release the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0145] Optionally, the pressure relief mechanism 23 and the wall portion 211 of the outer casing 21 can be an integrally formed structure or a separate structure. If the pressure relief mechanism 23 and the wall portion 211 are separate structures, the pressure relief mechanism 23 can be connected to the wall portion 211 by welding or other means. Correspondingly, the pressure relief mechanism 23 can be a pressure relief mechanism 23 such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve, or safety valve. If the pressure relief mechanism 23 and the wall portion 211 are an integrally formed structure, the pressure relief mechanism 23 is a region on the wall portion 211 with a weak structure, such as a region on the wall portion 211 with a groove.

[0146] The wall portion 211 has a first surface 2111 facing the electrode assembly 22. The first surface 2111 has a protruding abutment portion 2112. That is, the surface of the wall portion 211 facing the electrode assembly 22 is the first surface 2111, and the first surface 2111 is the inner surface of the wall portion 211. Correspondingly, the abutment portion 2112 is disposed on the side of the wall portion 211 facing the electrode assembly 22 in the thickness direction X of the wall portion, and the abutment portion 2112 is connected to the first surface 2111.

[0147] Optionally, the abutment portion 2112 and the wall portion 211 can be integrally formed, i.e., the abutment portion 2112 and the wall portion 211 are an integral structure, or they can be separate structures, i.e., the abutment portion 2112 and the wall portion 211 are separate structures. For example, referring to FIG7 and further referring to FIG8, FIG8 is a front view of the housing 212 of the housing 21 provided in some embodiments of the present application facing the second surface 2113 in the thickness direction X of the wall portion. The abutment portion 2112 and the wall portion 211 are integrally formed, and a groove 2114 is also formed on the second surface 2113 of the wall portion 211 on the side away from the electrode assembly 22 in the thickness direction X of the wall portion, corresponding to the position of the abutment portion 2112, so that the abutment portion 2112 protruding on the first surface 2111 is an integral structure that can be formed by a stamping process.

[0148] Along the thickness direction X of the wall portion, the abutting portion 2112 abuts against the electrode assembly 22, so that an exhaust channel 24 is formed between the electrode assembly 22 and the first surface 2111. That is, the abutting portion 2112 plays a supporting and separating role between the first surface 2111 and the electrode assembly 22, so that the electrode assembly 22 and the pressure relief mechanism 23 can be arranged at intervals in the thickness direction X of the wall portion, so that an exhaust gap is formed between the electrode assembly 22 and the first surface 2111 of the wall portion 211. This exhaust gap is the exhaust channel 24 formed between the electrode assembly 22 and the first surface 2111 of the wall portion 211.

[0149] The exhaust passage 24 is configured to guide the gas inside the housing 21 to the pressure relief mechanism 23. That is, when the pressure relief mechanism 23 opens the valve and releases the internal pressure of the battery cell 20, the exhaust passage 24 can be connected to the outside of the housing 21 through the pressure relief mechanism 23, so that the gas inside the housing 21 can be discharged to the outside of the housing 21 after passing through the exhaust passage 24 and the pressure relief mechanism 23 in sequence.

[0150] It should be noted that the electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction takes place. The structure of the electrode assembly 22 can be various. For example, the electrode assembly 22 can be a wound structure formed by winding a first electrode, a separator, and a second electrode, or a stacked structure formed by arranging the first electrode, a separator, and a second electrode in layers. In this case, the first electrode and the second electrode have opposite polarities, that is, the first electrode and the second electrode are the positive electrode and the negative electrode of the electrode assembly 22, respectively.

[0151] For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0152] The first electrode has a first tab 221 at one end, and the second electrode has a second tab 222 at one end. The first tab 221 and the second tab 222 are used as the positive and negative electrodes of the input or output electrode assembly 22, respectively. If the first electrode is a positive electrode, then the first tab 221 is used as the positive electrode of the output electrode assembly 22. The first tab 221 is a component formed by stacking and connecting the areas of the first electrode that are not coated with a positive electrode active material layer. Correspondingly, if the second electrode is a negative electrode, then the second tab 222 is used as the negative electrode of the output electrode assembly 22. The second tab 222 is a component formed by stacking and connecting the areas of the second electrode that are not coated with a negative electrode active material layer. Conversely, if the first electrode is a negative electrode, then the first tab 221 is used as the negative electrode of the output electrode assembly 22. The first tab 221 is a component formed by stacking and connecting the areas of the first electrode that are not coated with a negative electrode active material layer. Correspondingly, if the second electrode is a positive electrode, then the second tab 222 is used as the positive electrode of the output electrode assembly 22. The second tab 222 is a component formed by stacking and connecting the areas of the second electrode that are not coated with a positive electrode active material layer.

[0153] For example, the material of the first electrode 221 can be copper or aluminum, and similarly, the material of the second electrode 222 can also be copper or aluminum.

[0154] Optionally, the electrode assembly 22 housed within the housing 21 can be one or more. For example, in Figure 4, two electrode assemblies 22 are disposed within the housing 21 of the battery cell 20. The two electrode assemblies 22 are stacked along the first direction Y, that is, the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the electrode assembly 22 housed within the housing 21 can be one, three, four, five, six, seven, or eight, etc. Wherein, the thickness direction X of the wall is the height direction of the battery cell 20, the first direction Y is the thickness direction of the battery cell 20, and the second direction Z is the length direction of the battery cell 20.

[0155] In some embodiments, as shown in Figures 3 and 4, the battery cell 20 may further include an electrode terminal 25, which is insulated and mounted on the housing 21 and is used to be electrically connected to the electrode assembly 22 to output or input electrical energy of the battery cell 20.

[0156] It should be noted that the electrode terminal 25 is insulated and mounted on the housing 21, meaning that there is no electrical connection between the electrode terminal 25 and the housing 21.

[0157] In Figures 3 and 4, the battery cell 20 includes two electrode terminals 25, which are electrically connected to the first tab 221 and the second tab 222 of the electrode assembly 22, respectively, to realize the input or output of the positive and negative electrodes of the battery cell 20.

[0158] Alternatively, the electrode terminal 25 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0159] For example, in Figure 4, both electrode terminals 25 are insulatedly mounted on the end cap 213 of the housing 21, and the two electrode terminals 25 are spaced apart along the second direction Z. Correspondingly, the first tab 221 and the second tab 222 are both formed on the end of the electrode assembly 22 facing the end cap 213 in the thickness direction X of the wall portion, and the first tab 221 and the second tab 222 are spaced apart along the second direction Z. When the wall portion 211 is the second wall of the housing 212 that is opposite to the end cap 213 in the thickness direction X of the wall portion, the electrode terminals 25 and the pressure relief mechanism 23 are respectively disposed at both ends of the housing 21 in the thickness direction X of the wall portion. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, both electrode terminals 25 may be mounted on the housing 212, or one electrode terminal 25 may be disposed on the end cap 213 of the housing 21, and the other electrode terminal 25 may be disposed on the housing 212 of the housing 21.

[0160] In some embodiments, as shown in Figures 4 and 5, the battery cell 20 may further include two current collectors 26, both of which are disposed within the housing 21 and are arranged at intervals along the second direction Z. One current collector 26 is used to connect an electrode terminal 25 to a first tab 221 in a plurality of electrode assemblies 22, and the other current collector 26 is used to connect another electrode terminal 25 to a second tab 222 in a plurality of electrode assemblies 22, so as to realize the electrical connection between the electrode terminal 25 and the electrode assembly 22, which helps to reduce the assembly difficulty between the first tab 221 and the electrode terminal 25 and between the second tab 222 and the electrode terminal 25.

[0161] For example, the material of the current collector 26 can be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0162] In this embodiment, by providing a protruding abutment portion 2112 on the first surface 2111 of the wall portion 211 facing the electrode assembly 22, and by providing the abutment portion 2112 for the electrode assembly 22 to abut against in the thickness direction X of the wall portion, the supporting effect of the abutment portion 2112 enables the formation of an exhaust channel 24 between the electrode assembly 22 and the first surface 2111. This allows the electrode assembly 22 and the pressure relief mechanism 23 to be arranged at intervals. Thus, when the battery cell 20 experiences thermal runaway, the exhaust channel 24 can guide the thermal runaway gas inside the casing 21 to the pressure relief mechanism 23. This effectively alleviates the phenomenon of the electrode assembly 22 blocking or clogging the pressure relief mechanism 23 when the pressure relief mechanism 23 releases the internal pressure of the battery cell 20, thereby improving the smoothness of internal exhaust of the battery cell 20 when thermal runaway occurs. This effectively improves the pressure relief rate of the battery cell 20, which helps to reduce the risk of explosion or bursting of the battery cell 20 due to untimely pressure relief, thereby improving the reliability of the battery cell 20.

[0163] According to some embodiments of this application, referring to Figures 5 and 6, in a plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the abutment portion 2112 does not overlap with the orthographic projection of the pressure relief mechanism 23. That is, the projection of the abutment portion 2112 in the thickness direction X of the wall portion does not overlap with the projection of the pressure relief mechanism 23 in the thickness direction X of the wall portion; i.e., the abutment portion 2112 does not cover the pressure relief mechanism 23 in the thickness direction X of the wall portion.

[0164] In this embodiment, by setting the orthographic projections of the abutment portion 2112 and the pressure relief mechanism 23 in a plane perpendicular to the thickness direction X of the wall portion to be non-overlapping, the abutment portion 2112 does not cover or block the pressure relief mechanism 23, thereby effectively alleviating the phenomenon of the abutment portion 2112 blocking or clogging the pressure relief mechanism 23, thereby improving the exhaust smoothness of the battery cell 20 when thermal runaway occurs, which is beneficial to improving the pressure relief rate of the battery cell 20.

[0165] According to some embodiments of this application, as shown in Figures 6 and 7, a plurality of abutment portions 2112 are protruded from the first surface 2111, and the plurality of abutment portions 2112 are spaced apart.

[0166] The multiple abutting parts 2112 are spaced apart, meaning that in any direction perpendicular to the thickness direction X of the wall, the multiple abutting parts 2112 do not contact each other, and a gap is formed between every two abutting parts 2112.

[0167] For example, in FIG6, the abutment portion 2112 is a strip structure extending along the second direction Z. In other embodiments, the abutment portion 2112 may also be an arc-shaped structure, an "S"-shaped structure, or a "V"-shaped structure, etc.

[0168] For example, in Figure 6, four abutment portions 2112 are protruding on the first surface 2111. The four abutment portions 2112 include two rows of abutment portions 2112 spaced apart along the first direction Y, and each row of abutment portions 2112 includes two abutment portions 2112 spaced apart along the second direction Z, so that the four abutment portions 2112 are arranged in an array. Of course, in other embodiments, the number of abutment portions 2112 protruding on the first surface 2111 can also be one, two, three, five, or six, etc.

[0169] In this embodiment, by providing a plurality of abutment portions 2112 on the first surface 2111 and spacing the plurality of abutment portions 2112 apart, the abutment portions 2112 can improve the effect of separating the electrode assembly 22 and the pressure relief mechanism 23, while also allowing the gas inside the casing 21 to pass through the gaps between the plurality of abutment portions 2112. This helps to reduce the obstruction of the gas inside the casing 21 by the abutment portions 2112, thereby effectively improving the smoothness of internal venting of the battery cell 20 when thermal runaway occurs.

[0170] In some embodiments, as shown in FIG6, a plurality of abutment portions 2112 are disposed around the pressure relief mechanism 23. That is, the plurality of abutment portions 2112 are arranged at intervals along the circumference of the pressure relief mechanism 23 on the outer side of the pressure relief mechanism 23.

[0171] In this embodiment, by setting multiple abutment portions 2112 to be arranged around and spaced apart on the outer periphery of the pressure relief mechanism 23, the effect of the multiple abutment portions 2112 separating the electrode assembly 22 and the pressure relief mechanism 23 can be further improved, thereby further alleviating the phenomenon of the electrode assembly 22 blocking or clogging the pressure relief mechanism 23, which in turn helps to reduce the risk of explosion or bursting of the battery cell 20 due to untimely pressure relief, thereby improving the reliability of the battery cell 20.

[0172] According to some embodiments of this application, as shown in Figures 4, 5 and 6, the battery cell 20 includes a plurality of electrode assemblies 22, and each electrode assembly 22 abuts against at least one abutting portion 2112 along the thickness direction X of the wall.

[0173] For example, two electrode assemblies 22 are disposed inside the housing 21 of the battery cell 20, and the two electrode assemblies 22 are stacked along the first direction Y. Of course, in other embodiments, multiple electrode assemblies 22 may also be stacked along the second direction Z. Similarly, the number of electrode assemblies 22 inside the housing 21 may be three, four or five, etc.

[0174] Each electrode assembly 22 abuts against at least one abutting part 2112, that is, the first surface 2111 is provided with a plurality of abutting parts 2112, the number of abutting parts 2112 is greater than or equal to the number of electrode assemblies 22, and each electrode assembly 22 abuts against at least one abutting part 2112. In other words, each electrode assembly 22 may abut against only one abutting part 2112 or abut against multiple abutting parts 2112.

[0175] In this embodiment, the outer casing 21 of the battery cell 20 contains a plurality of electrode components 22, and each electrode component 22 abuts against at least one abutment portion 2112. This not only increases the capacity of the battery cell 20, but also allows each electrode component 22 and the pressure relief mechanism 23 to be spaced apart in the thickness direction X of the wall. This alleviates the phenomenon of multiple electrode components 22 blocking or clogging the pressure relief mechanism 23 when the pressure relief mechanism 23 releases the internal pressure of the battery cell 20. As a result, while achieving a large-capacity battery cell 20, the pressure relief effect and pressure relief rate of the battery cell 20 can also be improved, thereby improving the reliability of the battery cell 20.

[0176] In some embodiments, referring to Figures 4, 5, and 6, a plurality of electrode assemblies 22 are stacked along a first direction Y. A first surface 2111 is provided with multiple rows of abutment portions 2112 spaced apart along the first direction Y. Each row of abutment portions 2112 includes a plurality of abutment portions 2112 spaced apart along a second direction Z. The first direction Y, the second direction Z, and the thickness direction X of the wall are perpendicular to each other. Along the thickness direction X of the wall, a plurality of abutment portions 2112 in each row abut against one electrode assembly 22.

[0177] In this configuration, multiple abutment portions 2112 in each row of abutment portions 2112 abut against one electrode assembly 22. That is, multiple rows of abutment portions 2112 are protruding on the first surface 2111, and each row of abutment portions 2112 is correspondingly arranged with one electrode assembly 22, so that multiple abutment portions 2112 in each row of abutment portions 2112 are used for one electrode assembly 22 to abut against.

[0178] For example, in Figures 4 and 6, the battery cell 20 includes two electrode assemblies 22 stacked along the first direction Y. Correspondingly, the first surface 2111 is provided with two rows of abutment portions 2112 arranged at intervals along the first direction Y. Each row of abutment portions 2112 includes two abutment portions 2112 arranged at intervals along the second direction Z, such that the two abutment portions 2112 of one row of abutment portions 2112 abut against one electrode assembly 22, and the two abutment portions 2112 of the other row of abutment portions 2112 abut against another electrode assembly 22. Of course, in other embodiments, the number of abutment portions 2112 in each row of abutment portions 2112 may also be three, four or five, etc.

[0179] In this embodiment, by setting multiple electrode components 22 to be stacked along the first direction Y, and correspondingly providing multiple rows of abutment portions 2112 arranged along the first direction Y on the first surface 2111, and each row of abutment portions 2112 is provided with multiple abutment portions 2112 arranged at intervals along the second direction Z, each electrode component 22 can abut against multiple abutment portions 2112 in a row, thereby enhancing the function of the abutment portions 2112 in separating the electrode component 22 and the pressure relief mechanism 23, which is beneficial to further alleviate the phenomenon of the electrode component 22 blocking or clogging the pressure relief mechanism 23.

[0180] According to some embodiments of this application, referring to FIG9, FIG9 is a cross-sectional view of a battery cell 20 provided in some embodiments of this application. Along the thickness direction X of the wall portion, a protrusion 223 is formed at the end of the electrode assembly 22 that abuts against the abutment portion 2112, and the protrusion 223 contacts the wall portion 211.

[0181] Among them, a protrusion 223 is formed on the end of the electrode assembly 22 that abuts against the abutment portion 2112, that is, the protrusion 223 is formed on the end face of the end of the electrode assembly 22 that abuts against the abutment portion 2112.

[0182] The protrusion 223 contacts the wall portion 211, that is, the protrusion 223 and the wall portion 211 abut against each other, so that the electrode assembly 22 is a structure that partially abuts against the wall portion 211.

[0183] It should be noted that the protrusion 223 is part of the first or second electrode of the electrode assembly 22, that is, the protrusion 223 also includes active material for carrying out electrochemical reactions.

[0184] It should be noted that in the embodiment where a plurality of abutment portions 2112 are provided on the first surface 2111 and the plurality of abutment portions 2112 are arranged around the pressure relief mechanism 23, the protrusion 223 is located on the outside of the plurality of abutment portions 2112.

[0185] In this embodiment, by providing a protrusion 223 at one end of the electrode assembly 22 that abuts against the abutment portion 2112, and having the protrusion 223 in contact with the wall portion 211, the contact area between the electrode assembly 22 and the outer casing 21 can be increased, which is beneficial to improving the heat dissipation effect of the battery cell 20. On the other hand, the contact area between the electrode assembly 22 and the electrolyte contained in the outer casing 21 can be increased, and the electrode assembly 22 can come into contact with the electrolyte deposited on the wall portion 211, thereby improving the effect of the electrode assembly 22 being wetted by the electrolyte, which in turn is beneficial to improving the performance of the battery cell 20.

[0186] In some embodiments, referring to FIG9, the orthographic projection of the protrusion 223 and the orthographic projection of the pressure relief mechanism 23 do not overlap in the plane perpendicular to the thickness direction X of the wall. That is, the projection of the protrusion 223 in the thickness direction X of the wall does not overlap with the projection of the pressure relief mechanism 23 in the thickness direction X of the wall, i.e., the protrusion 223 does not cover the pressure relief mechanism 23 in the thickness direction X of the wall.

[0187] In this embodiment, by setting the orthographic projections of the protrusion 223 of the electrode assembly 22 and the pressure relief mechanism 23 in a plane perpendicular to the thickness direction X of the wall to be non-overlapping, the protrusion 223 of the electrode assembly 22 does not cover or block the pressure relief mechanism 23, thereby effectively alleviating the phenomenon that the protrusion 223 of the electrode assembly 22 blocks or obstructs the pressure relief mechanism 23, thereby improving the exhaust smoothness of the battery cell 20 when thermal runaway occurs, which is beneficial to improving the pressure relief rate of the battery cell 20.

[0188] In some embodiments, the electrode assembly 22 includes a first electrode and a second electrode with opposite polarities, at least one of which has a protrusion 223.

[0189] For example, in the embodiments of this application, the first electrode and the second electrode are wound together to form an electrode assembly 22 with a wound structure. Correspondingly, protrusions 223 are formed on both the first electrode and the second electrode. That is, the protrusions 223 include both the portion of the first electrode and the portion of the second electrode.

[0190] In this embodiment, by forming a protrusion 223 in at least one of the first electrode and the second electrode of the electrode assembly 22, so that the first electrode and / or the second electrode are partially protruding structures, it is beneficial to increase the energy density of the battery cell 20.

[0191] According to some embodiments of this application, as shown in Figures 6 and 7, the abutment portion 2112 is integrally formed with the wall portion 211. That is, the abutment portion 2112 is a structure formed by an integral forming process of the wall portion 211, such as stamping, casting, or milling.

[0192] In this embodiment, by setting the abutment portion 2112 and the wall portion 211 as an integrally formed structure, that is, the abutment portion 2112 and the wall portion 211 are an integral structure, it is beneficial to improve the structural stability and reliability of the abutment portion 2112 protruding on the first surface 2111, so as to alleviate the phenomenon of the abutment portion 2112 falling off during use, and thus improve the stability of the battery cell 20 in use.

[0193] In some embodiments, as shown in Figures 7 and 8, along the thickness direction X of the wall portion, the wall portion 211 has a second surface 2113 facing away from the electrode assembly 22, and a groove 2114 is formed on the second surface 2113 at the position corresponding to the abutment portion 2112.

[0194] In this embodiment, the grooves 2114 and the abutments 2112 are one-to-one corresponding structures in the thickness direction X of the wall. That is, the second surface 2113 has a groove 2114 at the position of each abutment 2112. It should be noted that in the embodiment where multiple abutments 2112 are formed on the first surface 2111, multiple grooves 2114 are also formed on the second surface 2113, and the grooves 2114 and the abutments 2112 are opposite in position and the same in number.

[0195] For example, the abutment portion 2112 provided on the first surface 2111 of the wall portion 211 facing the electrode assembly 22 is formed by a stamping process, so that the abutment portion 2112 is formed on the first surface 2111 on the side of the wall portion 211 facing the electrode assembly 22, and a groove 2114 is formed on the second surface 2113 of the wall portion 211 facing away from the electrode assembly 22 at a position corresponding to the abutment portion 2112. Of course, the processing method of the abutment portion 2112 provided on the first surface 2111 of the wall portion 211 facing the electrode assembly 22 is not limited to this. In other embodiments, the abutment portion 2112 provided on the first surface 2111 of the wall portion 211 facing the electrode assembly 22 can also be formed by a processing process such as casting or milling.

[0196] In this embodiment, by forming a groove 2114 on the second surface 2113 of the wall portion 211 away from the electrode assembly 22 and at a position corresponding to the abutment portion 2112, the abutment portion 2112 of the wall portion 211 is a structure that can be formed by stamping. This allows the abutment portion 2112 and the groove 2114 to be formed on both sides of the wall portion 211, which helps to reduce the difficulty of protruding the abutment portion 2112 on the first surface 2111 of the wall portion 211, thereby reducing the manufacturing difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0197] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures, such as the abutment portion 2112 and the wall portion 211 being separately provided, and the abutment portion 2112 being connected to the first surface 2111.

[0198] For example, the abutment portion 2112 can be connected to the first surface 2111 of the wall portion 211 by means of adhesive bonding, welding or bolting.

[0199] In this embodiment, by setting the abutment portion 2112 and the wall portion 211 as separate structures, that is, the abutment portion 2112 and the wall portion 211 are separate structures, and the abutment portion 2112 is connected to the first surface 2111 of the wall portion 211, the battery cell 20 with this structure can reduce the difficulty of forming the abutment portion 2112 on the first surface 2111, thereby reducing the manufacturing difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0200] According to some embodiments of this application, referring to Figures 3, 4, and 5, the housing 21 may include a housing 212 and an end cap 213. The housing 212 includes an integrally formed first wall and a second wall. The first wall surrounds the second wall. Along the thickness direction X of the wall portion, one end of the first wall is connected to the second wall, and the other end forms an opening 2122. The first wall and the second wall together define a receiving cavity 2121 for accommodating the electrode assembly 22. The end cap 213 closes the opening 2122, and the second wall is a wall portion 211.

[0201] The shell 212 includes an integrally formed first wall and a second wall, meaning that the shell 212 is manufactured using an integral forming process, such as stamping, casting, or extrusion molding. In other words, the first wall and the second wall of the shell 212 are an integral structure.

[0202] The second wall is a wall portion 211, which is a wall of the housing 212 that is opposite to the end cap 213 in the thickness direction X of the wall portion. Correspondingly, the pressure relief mechanism 23 is provided on the second wall of the housing 212. Correspondingly, the second wall has a first surface 2111 facing the electrode assembly 22, and the side of the second wall facing the electrode assembly 22 has a protruding abutment portion 2112.

[0203] In this embodiment, by setting the wall portion 211 of the outer casing 21 as the second wall of the casing 212 that is opposite to the end cap 213 in the thickness direction X of the wall portion, the battery cell 20 with this structure can make the wall portion 211 equipped with the pressure relief mechanism 23 far away from the end cap 213, so that there is no direct connection between the wall portion 211 and the end cap 213. This can alleviate the phenomenon that the stress generated when the casing 212 and the end cap 213 are assembled and connected to each other is applied to the pressure relief mechanism 23, thereby reducing the risk of the pressure relief mechanism 23 being damaged or its structural strength decreasing. This can further alleviate the phenomenon of premature pressure relief caused by the pressure relief mechanism 23, thereby improving the service life and reliability of the battery cell 20.

[0204] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the outer casing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity 2121 with an opening 2122 for accommodating the electrode assembly 22. The end cap 213 closes the opening 2122 and is a wall portion 211. That is, the pressure relief mechanism 23 is provided on the end cap 213 of the outer casing 21. Correspondingly, the end cap 213 has a first surface 2111 facing the electrode assembly 22, and the side of the end cap 213 facing the electrode assembly 22 has a protruding abutment portion 2112.

[0205] In this embodiment, by setting the wall portion 211 of the outer casing 21 as an end cap 213 for closing the opening 2122 of the casing 212, the battery cell 20 with this structure is easy to assemble the pressure relief mechanism 23 onto the wall portion 211, which helps to reduce the assembly difficulty of assembling the pressure relief mechanism 23 onto the wall portion 211, thereby reducing the assembly difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0206] According to some embodiments of this application, as shown in FIG2, this application also provides a battery 100, which includes a battery cell 20 of any of the above schemes.

[0207] The battery 100 may also include a housing 10, in which the battery cells 20 are housed.

[0208] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0209] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0210] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in Figure 2, the box 10 is a cuboid structure.

[0211] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, in Figure 2, the housing 100 of the battery 100 contains multiple battery cells 20. These multiple battery cells 20 can be connected in series, parallel, or a combination thereof. A combination thereof means that some of the multiple battery cells 20 are connected in series and others in parallel. Multiple battery cells 20 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or a combination thereof to form a battery module, and then these battery modules are connected in series, parallel, or a combination thereof to form a whole, which is then housed within the housing 10.

[0212] The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0213] It should be noted that in some embodiments, the battery 100 may not have a housing 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of multiple battery cells 20 can be directly mounted onto an electrical device to provide power to the electrical device through the multiple battery cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0214] According to some embodiments of this application, referring to Figures 2, 7, and 8, and further referring to Figures 10 and 11, Figure 10 is an assembly diagram of the battery cell 20 and the fixing member 30 provided in some embodiments of this application, and Figure 11 is a structural diagram of the fixing member 30 of the battery 100 provided in some embodiments of this application. Along the thickness direction X of the wall portion, the wall portion 211 has a second surface 2113 facing away from the electrode assembly 22, and a groove 2114 is formed on the second surface 2113 corresponding to the position of the abutment portion 2112. The battery 100 includes a fixing member 30, and the fixing member 30 has a third surface 31 in the thickness direction X of the wall portion facing the second surface 2113. The third surface 31 has a protruding snap-fit ​​portion 32, which is inserted into the groove 2114.

[0215] The fastener 30 is disposed inside the housing 10 and connected to the housing 10 to fix the fastener 30 inside the housing 10.

[0216] The fastener 30 has a third surface 31 in the thickness direction X of the wall portion, which is disposed facing the second surface 2113. That is, the surface of the fastener 30 in the thickness direction X of the wall portion that is disposed facing each other with the second surface 2113 is the third surface 31. In other words, the fastener 30 has a third surface 31 formed on at least one side in the thickness direction X of the wall portion, and the third surface 31 is disposed facing the second surface 2113.

[0217] The third surface 31 is provided with a snap-fit ​​part 32, which is engaged with the groove 2114. That is, the third surface 31 is provided with a snap-fit ​​part 32, and the snap-fit ​​part 32 can be inserted into the groove 2114 of the battery cell 20 along the thickness direction X of the wall to snap the battery cell 20 onto the fixing member 30.

[0218] In this embodiment, by forming a groove 2114 on the second surface 2113 of the wall portion 211 of the outer casing 21, which is opposite to the electrode assembly 22 and corresponds to the abutment portion 2112, the abutment portion 2112 on the wall portion 211 can be formed by stamping, which is convenient for processing and manufacturing and helps to reduce the difficulty of forming the abutment portion 2112 on the first surface 2111 of the wall portion 211. In addition, by providing a locking portion 32 on the third surface 31 of the fastener 30 facing the second surface 2113, the locking portion 32 can be inserted and engaged with the groove 2114 on the wall portion 211 to fasten and limit the battery cell 20. This helps to improve the structural stability and reliability of the battery cell 20 assembled into the battery 100, thereby reducing the phenomenon of shaking or shifting of the battery cell 20 during use. This effectively reduces the risk of the battery cell 20 shifting or colliding with other components, thereby improving the stability and service life of the battery 100.

[0219] According to some embodiments of this application, as shown in Figures 7, 8, 10 and 11, a plurality of grooves 2114 are formed on the second surface 2113, and a plurality of snap-fit ​​portions 32 are protruding on the third surface 31, each snap-fit ​​portion 32 being inserted into and engaged with a groove 2114.

[0220] Each snap-fit ​​part 32 is inserted into a groove 2114, that is, the snap-fit ​​parts 32 provided on the third surface 31 and the grooves 2114 provided on the second surface 2113 are in a one-to-one correspondence.

[0221] For example, in FIG8, four grooves 2114 are provided on the second surface 2113 of each battery cell 20. Correspondingly, in FIG11, four snap-fit ​​parts 32 are provided on the area of ​​the third surface 31 of the fastener 30 opposite to the second surface 2113 of each battery cell 20. Each snap-fit ​​part 32 is snapped into a groove 2114.

[0222] In this embodiment, by providing multiple grooves 2114 on the second surface 2113 of the wall portion 211 and providing multiple latching portions 32 on the third surface 31 of the fixing member 30, each latching portion 32 can be inserted into a groove 2114, so that the battery cell 20 can be assembled with the multiple latching portions 32 of the fixing member 30 through the multiple grooves 2114 on the wall portion 211. This helps to further improve the effect of fastening and limiting the battery cell 20, thereby further reducing the phenomenon of shaking or shifting of the battery cell 20 during use, and further reducing the risk of displacement or collision with other components of the battery cell 20, thereby improving the stability and service life of the battery 100.

[0223] In some embodiments, as shown in FIG10, the second surface 2113 abuts against the third surface 31. That is, the wall portion 211 of the battery cell 20 abuts against the third surface 31 of the fixing member 30 in the thickness direction X of the wall portion.

[0224] In this embodiment, by abutting the second surface 2113 of the wall portion 211 against the third surface 31 of the fastener 30, the wall portion 211 is designed to abut against the fastener 30. This further improves the assembly stability between the battery cell 20 and the fastener 30, and enhances the interlocking effect between the snap-fit ​​portion 32 and the groove 2114. Furthermore, by setting the second surface 2113 of the wall portion 211 and the third surface 31 of the fastener 30 to abut against each other, the gap between the battery cell 20 and the fastener 30 can be reduced. This saves the space shared by the battery cell 20 and the fastener 30 in the thickness direction X of the wall portion, thus improving the utilization rate of the internal space of the battery 100.

[0225] According to some embodiments of this application, referring to Figures 5, 8, 10, and 11, and further referring to Figure 12, which is a cross-sectional view of the fixing member 30 of the battery 100 provided in some embodiments of this application. An exhaust chamber 33 is formed inside the fixing member 30, and a pressure relief port 34 is provided on the third surface 31, communicating with the exhaust chamber 33. Along the thickness direction X of the wall portion, a pressure relief mechanism 23 is disposed opposite to the pressure relief port 34.

[0226] The fixing member 30 is a structure that extends along the second direction Z, and the exhaust chamber 33 extends through both ends of the fixing member 30 along the second direction Z, so as to discharge the gas in the exhaust chamber 33 out of the housing 10.

[0227] A pressure relief port 34 is provided on the third surface 31. The pressure relief port 34 is connected to the exhaust chamber 33. That is, the fixing member 30 is provided with a pressure relief port 34, and the two ends of the pressure relief port 34 in the thickness direction X of the wall penetrate the cavity wall of the third surface 31 and the exhaust chamber 33 respectively, so that the pressure relief port 34 is formed on the third surface 31 and is connected to the exhaust chamber 33.

[0228] Along the thickness direction X of the wall, the pressure relief mechanism 23 is arranged opposite to the pressure relief port 34, that is, the pressure relief mechanism 23 is arranged facing the pressure relief port 34 in the thickness direction X of the wall. In other words, at least part of the projection of the pressure relief mechanism 23 in the thickness direction X of the wall is located inside the pressure relief port 34, so that the gas released by the pressure relief mechanism 23 can enter the exhaust chamber 33 through the pressure relief port 34.

[0229] In this embodiment, the fixing member 30 is further provided with an exhaust chamber 33 inside, and a pressure relief port 34 communicating with the exhaust chamber 33 is provided on the third surface 31 of the fixing member 30. By setting the pressure relief mechanism 23 of the battery cell 20 to be arranged opposite to the pressure relief port 34 in the thickness direction X of the wall, the gas released by the pressure relief mechanism 23 when the battery cell 20 experiences thermal runaway can directly enter the exhaust chamber 33 through the pressure relief port 34 and be further discharged through the exhaust chamber 33. The battery 100 with this structure has the following advantages: The elimination of the need for a separate venting component for the pressure relief mechanism 23 mounted on the wall portion 211 reduces the assembly difficulty and manufacturing cost of the battery 100. Furthermore, it improves the venting smoothness of the pressure relief mechanism 23 mounted on the wall portion 211, mitigating the possibility of it being blocked or obstructed by the fixing member 30. This increases the pressure relief rate of the battery cell 20, thereby reducing the risk of explosion or rupture due to untimely pressure relief and improving the reliability of the battery 100. In addition, the structure where the snap-fit ​​portion 32 of the fixing member 30 is inserted into the groove 2114 of the wall portion 211 also mitigates the phenomenon of the battery cell 20 shifting during pressure relief by the pressure relief mechanism 23. This reduces the risk of misalignment between the pressure relief mechanism 23 and the pressure relief port 34 due to the shifting of the battery cell 20, thus improving the stability and reliability of pressure relief of the battery cell 20 during thermal runaway.

[0230] In some embodiments, the projection of the pressure relief mechanism 23 is located within the pressure relief port 34 along the thickness direction X of the wall. That is, in a plane perpendicular to the thickness direction X of the wall, the orthographic projection of the wall surface of the pressure relief port 34 surrounds the outside of the orthographic projection of the pressure relief mechanism 23.

[0231] In this embodiment, by setting the projection of the pressure relief mechanism 23 in the thickness direction X of the wall portion to be located inside the pressure relief port 34, the pressure relief port 34 can receive gas released from any position of the pressure relief mechanism 23, thereby further improving the exhaust smoothness of the pressure relief mechanism 23 provided on the wall portion 211, so as to further improve the pressure relief rate of the battery cell 20.

[0232] According to some embodiments of this application, as shown in FIG12, a flow channel 35 may also be formed inside the fixing member 30. The flow channel 35 is used to accommodate a heat exchange medium, which is configured to exchange heat with the battery cell 20.

[0233] In one embodiment where an exhaust chamber 33 is formed inside the fixing member 30, the flow channel 35 formed inside the fixing member 30 is not connected to the exhaust chamber 33, that is, the flow channel 35 is formed inside the cavity wall of the exhaust chamber 33.

[0234] The flow channel 35 is used to contain the heat exchange medium, which is configured to exchange heat with the battery cell 20. That is, the heat exchange medium can exchange heat with the battery cell 20 through the fixing member 30 to manage the temperature of the battery cell 20.

[0235] For example, the heat exchange medium can be a gas, such as air or hydrogen, and the fluid medium can be a liquid, such as water, a salt solution, or liquid nitrogen.

[0236] In this embodiment, by providing a flow channel 35 inside the fixing member 30, the flow channel 35 of the fixing member 30 can accommodate the heat exchange medium for heat exchange with the battery cell 20, so that the fixing member 30 can also play the role of managing the temperature of the battery cell 20. The battery 100 with this structure can integrate the heat management component for managing the temperature of the battery cell 20 onto the fixing member 30, which helps to reduce the assembly difficulty of the battery 100 and the manufacturing cost of the battery 100. On the other hand, the structure in which the snap-fit ​​portion 32 of the fixing member 30 is inserted into the groove 2114 of the wall portion 211 can also increase the contact area between the battery cell 20 and the fixing member 30, thereby increasing the heat exchange area between the battery cell 20 and the fixing member 30, so as to improve the effect of the fixing member 30 in managing the temperature of the battery cell 20.

[0237] According to some embodiments of this application, referring to Figures 10, 11, and 12, along the thickness direction X of the wall portion, both sides of the fixing member 30 have a third surface 31, and both sides of the fixing member 30 are provided with battery cells 20, with the second surfaces 2113 of the battery cells 20 on both sides of the fixing member 30 facing each other. That is, along the thickness direction X of the wall portion, both sides of the fixing member 30 are provided with battery cells 20, and the second surfaces 2113 of the battery cells 20 on both sides of the fixing member 30 face each other, such that the second surfaces 2113 of the battery cells 20 on both sides of the fixing member 30 face the two third surfaces 31 on both sides of the fixing member 30 respectively.

[0238] In this embodiment, the fixing member 30 has a third surface 31 on both sides of the wall thickness direction X, so that battery cells 20 can be provided on both sides of the fixing member 30. The battery cells 20 located on both sides of the fixing member 30 can be fixed and limited by one fixing member 30, so that the battery cells 20 located on both sides of the fixing member 30 can share one fixing member 30. On the one hand, it can save the manufacturing cost of the battery 100 and reduce the assembly difficulty of the battery 100. On the other hand, it can optimize the internal space of the battery 100 and improve the internal space utilization rate of the battery 100.

[0239] According to some embodiments of this application, referring to Figures 8, 10, and 11, the battery 100 includes a plurality of battery cells 20 stacked along a first direction Y, which is perpendicular to the thickness direction X of the wall portion. Along the thickness direction X of the wall portion, the second surfaces 2113 of the plurality of battery cells 20 are all facing the third surface 31, and the third surface 31 has a protruding snap-fit ​​portion 32 corresponding to each battery cell 20.

[0240] In this configuration, the second surfaces 2113 of multiple battery cells 20 are all facing the third surface 31. The third surface 31 is provided with a snap-fit ​​portion 32 for each battery cell 20. In other words, the second surfaces 2113 of the multiple battery cells 20 stacked along the first direction Y are all arranged facing the third surface 31 of the fixing member 30. This allows the pressure relief mechanism 23 of the multiple battery cells 20 stacked along the first direction Y to be arranged facing the third surface 31 of the fixing member 30. Furthermore, the third surface 31 of the fixing member 30 is provided with a snap-fit ​​portion 32 for each area of ​​the battery cell 20 stacked along the first direction Y, so that the multiple battery cells 20 stacked along the first direction Y can be snap-fitted and fixed onto one fixing member 30.

[0241] For example, in FIG10, the battery 100 includes multiple sets of battery cells 20 arranged along the second direction Z. Each set of battery cells 20 includes multiple battery cells 20 stacked along the first direction Y. In the thickness direction X of the wall, multiple sets of battery cells 20 are provided on both sides of the fixing member 30. Correspondingly, one third surface 31 of the fixing member 30 faces the second surface 2113 of the multiple battery cells 20 located on one side of the fixing member 30, and the other third surface 31 of the fixing member 30 faces the second surface 2113 of the multiple battery cells 20 located on the other side of the fixing member 30.

[0242] For example, in FIG10, each group of battery cells 20 includes two battery cells 20 stacked along the first direction Y. Of course, in other embodiments, each group of battery cells 20 may also include three, four, five or six battery cells 20 stacked along the first direction Y.

[0243] In this embodiment, the battery 100 is provided with a plurality of battery cells 20 stacked along the first direction Y, and the third surface 31 of the fixing member 30 is provided with a snap-fit ​​portion 32 for each battery cell 20, so that the plurality of battery cells 20 stacked along the first direction Y share a fixing member 30, and the plurality of battery cells 20 are fastened to a fixing member 30. The battery 100 with this structure can save the manufacturing cost of the battery 100 and reduce the assembly difficulty of the battery 100, and can optimize the internal space of the battery 100. On the other hand, when the battery cells 20 expand along the first direction Y during use, it can reduce the change in the distance between two adjacent battery cells 20 in the first direction Y, so that the torque or tension of the busbar connecting the two adjacent battery cells 20 can be absorbed and distributed by the fixing member 30, thereby reducing the pulling phenomenon between the battery cells 20 and the busbar, which helps to reduce the risk of electrical connection failure between the battery cells 20, thereby improving the stability and service life of the battery 100.

[0244] In some embodiments, as shown in Figures 3 and 10, the outer casing 21 has two opposing fourth surfaces 214 along the first direction Y. The fourth surface 214 is the surface with the largest area among the outer surfaces of the outer casing 21, and the fourth surface 214 is perpendicular to the first direction Y.

[0245] The outer casing 21 has two opposing fourth surfaces 214, which are the surfaces with the largest area on the outer surface of the outer casing 21. In other words, the two fourth surfaces 214 are the outer surfaces of the outer casing 21 on both sides in the thickness direction of the battery cell 20.

[0246] The fourth surface 214 is perpendicular to the first direction Y. That is, among the multiple battery cells 20 stacked along the first direction Y, the fourth surface 214 between two adjacent battery cells 20 is arranged facing each other in the first direction Y and abutting against each other.

[0247] In this embodiment, by setting the fourth surface 214 with the largest area on the outer surface of the housing 21 to be perpendicular to the first direction Y, the multiple battery cells 20 are stacked along the thickness direction of the battery cells 20. Thus, the fastener 30 can also constrain and restrict the battery cells 20 in the direction of greater expansion, thereby alleviating the pulling phenomenon between the battery cells 20 and the busbar component in the direction of the greatest expansion of the battery cells 20, which helps to further reduce the risk of electrical connection failure between the battery cells 20.

[0248] According to some embodiments of this application, referring to FIG2, the battery 100 may further include a housing 10, the interior of which is formed an assembly space. The battery cell 20 and the fixing member 30 are both accommodated in the assembly space, and the fixing member 30 is connected to the housing 10. The housing 10 includes a first housing body 11 and a second housing body 12 arranged along a first direction Y. The first housing body 11 and the second housing body 12 cover each other and jointly define the assembly space.

[0249] It should be noted that in some embodiments, the battery 100 may not have a housing 10. The battery 100, including the fixing member 30 and the battery cells 20, can be directly assembled and installed onto the electrical device. Correspondingly, the fixing member 30 is fixed to the electrical device, thereby providing power to the electrical device. That is to say, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0250] In this embodiment, by setting the opposing first box body 11 and second box body 12 as arranged along the first direction Y and covering each other, the arrangement direction of the first box body 11 and the second box body 12 is the same as the stacking direction of the multiple battery cells 20. This allows the multiple battery cells 20 stacked along the first direction Y to be arranged flat inside the box body 10. On the one hand, this facilitates assembly and reduces the difficulty of assembling the battery cells 20 inside the box body 10. On the other hand, the fastener 30 can constrain and restrict the multiple battery cells 20 in the direction of greater expansion, thereby alleviating the pulling phenomenon between the battery cells 20 and the busbar component in the direction of the greatest expansion of the battery cells 20.

[0251] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 or a battery 100 of any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0252] The electrical device can be any of the aforementioned devices or systems that use battery cell 20 or battery 100.

[0253] According to some embodiments of this application, referring to Figures 3 to 8, this application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, and a pressure relief mechanism 23. The housing 21 has a wall portion 211 and includes a shell 212 and an end cap 213. The shell 212 includes an integrally formed first wall and a second wall. The first wall surrounds the second wall. Along the thickness direction X of the wall portion, one end of the first wall is connected to the second wall, and the other end forms an opening 2122. The first wall and the second wall together define a receiving cavity 2121. The end cap 213 closes the opening 2122. The second wall is the wall portion 211. The electrode assembly 22 is received within the receiving cavity 2121. Multiple electrode assemblies 22 are stacked along the first direction Y. The pressure relief mechanism 23 is disposed on the wall portion 211 and is configured to release the internal pressure of the battery cell 20. Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2111 facing the electrode assembly 22 and a second surface 2113 facing away from the electrode assembly 22. The first surface 2111 has multiple rows of abutment portions 2112 arranged at intervals along the first direction Y. Each row of abutment portions 2112 includes multiple abutment portions 2112 arranged at intervals along the second direction Z. The abutment portions 2112 are integrally formed with the wall portion 211. The second surface 2113 has grooves 2114 formed at the positions of the abutment portions 2112. The first direction Y, the second direction Z, and the thickness direction X of the wall portion are perpendicular to each other. Multiple abutment portions 2112 in each row of abutment portions 2112 abut against one electrode assembly 22, so that an exhaust channel 24 is formed between the electrode assembly 22 and the first surface 2111. The exhaust channel 24 is configured to guide the gas inside the housing 21 to the pressure relief mechanism 23. In a plane perpendicular to the thickness direction X of the wall, the orthographic projection of the contact portion 2112 does not overlap with the orthographic projection of the pressure relief mechanism 23.

[0254] According to some embodiments of this application, referring to Figures 2 to 8 and Figures 10 to 12, this application also provides a battery 100, which includes a housing 10, a battery cell 20, and a fixing member 30. An assembly space is formed inside the housing 10, within which the battery cell 20 and the fixing member 30 are both accommodated, and the fixing member 30 is connected to the housing 10. The housing 10 includes a first housing body 11 and a second housing body 12 arranged along a first direction Y, the first housing body 11 and the second housing body 12 overlapping each other and jointly defining the assembly space. The battery cell 20 includes a housing 21, an electrode assembly 22, and a pressure relief mechanism 23. The housing 21 has a wall portion 211. The electrode assembly 22 is accommodated within a receiving cavity 2121. The pressure relief mechanism 23 is disposed on the wall portion 211 and is configured to release the internal pressure of the battery cell 20. Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2111 facing the electrode assembly 22 and a second surface 2113 facing away from the electrode assembly 22. The first surface 2111 has a protruding abutment portion 2112, which abuts against the electrode assembly 22 along the thickness direction X of the wall portion, so that an exhaust channel 24 is formed between the electrode assembly 22 and the first surface 2111. The exhaust channel 24 is configured to guide the gas inside the housing 21 to the pressure relief mechanism 23. The second surface 2113 has a groove 2114 corresponding to the position of the abutment portion 2112. The fastener 30 has a third surface 31 in the thickness direction X of the wall portion, which faces the second surface 2113. The third surface 31 abuts against the second surface 2113, and the third surface 31 has a protruding snap-fit ​​portion 32, which is inserted into the groove 2114. The second surface 2113 has multiple grooves 2114, and the third surface 31 has multiple latching portions 32 protruding from it, each latching portion 32 engaging with a groove 2114. An exhaust chamber 33 is formed inside the fixing member 30, and a pressure relief port 34 is provided on the third surface 31, communicating with the exhaust chamber 33. Along the thickness direction X of the wall, the projection of the pressure relief mechanism 23 is located within the pressure relief port 34. A flow channel 35 is formed within the cavity wall of the exhaust chamber 33 of the fixing member 30, the flow channel 35 being used to contain a heat exchange medium configured to exchange heat with the battery cell 20. The housing 10 contains multiple sets of battery cells 20 arranged along the second direction Z. Each set of battery cells 20 includes multiple battery cells 20 stacked along the first direction Y. In the thickness direction X of the wall, multiple sets of battery cells 20 are arranged on both sides of the fixing member 30. Both sides of the fixing member 30 have a third surface 31. The second surfaces 2113 of the battery cells 20 located on both sides of the fixing member 30 face each other. The third surface 31 is provided with a snap-fit ​​part 32 for each battery cell 20.Along the first direction Y, the outer shell 21 has two opposing fourth surfaces 214. The fourth surface 214 is the surface with the largest area among the outer surfaces of the outer shell 21. The fourth surface 214 is perpendicular to the first direction Y. The thickness direction X of the wall, the first direction Y, and the second direction Z are all perpendicular to each other.

[0255] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0256] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, comprising: a housing having a wall portion; an electrode assembly accommodated in the housing; and a pressure relief mechanism provided to the wall portion, the pressure relief mechanism being configured to release internal pressure of the battery cell; wherein the wall portion has a first surface facing the electrode assembly, the first surface being provided with an abutting portion, the abutting portion being abutted against the electrode assembly along a thickness direction of the wall portion to form an exhaust passage between the electrode assembly and the first surface, the exhaust passage being configured to guide gas inside the housing to the pressure relief mechanism. A projection of the abutting portion in a plane perpendicular to the thickness direction of the wall portion does not overlap a projection of the pressure relief mechanism.

2. The battery cell of claim 1, wherein, The first surface is provided with a plurality of the abutting portions, the plurality of the abutting portions being spaced apart.

3. The battery cell of claim 1 or 2, wherein, The plurality of the abutting portions are provided around the pressure relief mechanism.

4. The battery cell of claim 3, wherein, The battery cell includes a plurality of the electrode assemblies, each of the electrode assemblies being abutted against at least one of the abutting portions along the thickness direction of the wall portion.

5. The battery cell of claim 3 or 4, wherein, The plurality of the electrode assemblies are stacked along a first direction; 6. The battery cell of claim 5, wherein, The first surface is provided with a plurality of rows of the abutting portions spaced apart along the first direction, each row of the abutting portions including a plurality of the abutting portions spaced apart along a second direction, the first direction, the second direction, and the thickness direction of the wall portion being perpendicular to each other; wherein the plurality of the abutting portions in each row of the abutting portions are abutted against one of the electrode assemblies along the thickness direction of the wall portion. The electrode assembly is formed with a protrusion at an end abutted against the abutting portion along the thickness direction of the wall portion, the protrusion being in contact with the wall portion.

7. The battery cell of any one of claims 1-6, wherein, A projection of the protrusion in a plane perpendicular to the thickness direction of the wall portion does not overlap a projection of the pressure relief mechanism.

8. The battery cell of claim 7, wherein, The electrode assembly includes first and second polar plates having opposite polarities, at least one of the first and second polar plates being formed with the protrusion.

9. The battery cell of claim 7 or 8, wherein, The abutting portion is integrally formed with the wall portion.

10. The battery cell of any one of claims 1-9, wherein, The wall portion has a second surface facing away from the electrode assembly along the thickness direction of the wall portion, the second surface being formed with a groove corresponding to a position of the abutting portion.

11. The battery cell of claim 10, wherein, The abutting portion is separately provided from the wall portion and connected to the first surface.

12. The battery cell of any one of claims 1-9, wherein, The housing includes:

13. The battery cell of any one of claims 1-12, wherein, a housing body including integrally formed first and second walls, the first wall being provided around the second wall, one end of the first wall being connected to the second wall along the thickness direction of the wall portion, and the other end of the first wall being enclosed to form an opening, the first and second walls jointly defining an accommodation cavity for accommodating the electrode assembly; an end cover closing the opening; wherein the second wall is the wall portion. The housing includes:

14. The battery cell of any one of claims 1-12, wherein, a housing body internally formed with an accommodation cavity having an opening, the accommodation cavity being for accommodating the electrode assembly; an end cover closing the opening; wherein the end cover is the wall portion. 15.A battery including the battery cell according to any one of claims 1 to 14. The wall portion has a second surface facing away from the electrode assembly along the thickness direction of the wall portion, the second surface being formed with a groove corresponding to a position of the abutting portion.

16. The battery of claim 15, wherein, ​ The battery includes a fixing member having a third surface facing the second surface in the thickness direction of the wall portion, the third surface being provided with a clamping portion.

17. The battery of claim 16, wherein, The second surface is formed with a plurality of grooves, and the third surface is provided with a plurality of clamping portions, each of which is inserted into a groove.

18. The battery of claim 16 or 17, wherein, The second surface abuts against the third surface.

19. The battery of any one of claims 16-18, wherein, The fixing member is internally formed with an exhaust cavity, and the third surface is provided with a pressure relief port communicating with the exhaust cavity. The pressure relief mechanism is arranged opposite the pressure relief port in the thickness direction of the wall portion.

20. The battery of claim 19, wherein, The projection of the pressure relief mechanism is located in the pressure relief port in the thickness direction of the wall portion.

21. The battery of any one of claims 16-20, wherein, The fixing member is internally formed with a flow channel for accommodating a heat exchange medium configured to exchange heat with the battery monomer.

22. The battery of any one of claims 16-21, wherein, Both sides of the fixing member have the third surface in the thickness direction of the wall portion, and the battery monomer is arranged on both sides of the fixing member, and the second surface of the battery monomer on both sides of the fixing member faces the third surface.

23. The battery of any one of claims 16-22, wherein, The battery includes a plurality of battery monomers arranged in a first direction, and the first direction is perpendicular to the thickness direction of the wall portion. The second surface of each of the plurality of battery monomers faces the third surface in the thickness direction of the wall portion, and the third surface is provided with the clamping portion corresponding to each of the battery monomers.

24. The battery of claim 23, wherein, In the first direction, the shell has two opposite fourth surfaces, which are the largest surfaces of the outer surface of the shell, and the fourth surface is perpendicular to the first direction.

25. The battery of claim 23 or 24, wherein, The battery further includes a box, and the box is internally formed with an assembly space, and the battery monomer and the fixing member are accommodated in the assembly space, and the fixing member is connected with the box. The box includes a first box body and a second box body arranged in the first direction, and the first box body and the second box body are overlapped with each other and jointly define the assembly space.

26. An electrical device comprising the battery monomer of any one of claims 1-14 or the battery of any one of claims 15-25, the battery monomer being used to provide electrical energy.

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