Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly and a pressure relief mechanism, the housing has a wall portion. The electrode assembly is housed within the housing. The pressure relief mechanism is provided on the wall portion, and the pressure relief mechanism is configured to release internal pressure of the battery cells. The wall portion is provided with a first surface facing the electrode assembly, the first surface is provided with an abutting portion in a protruding mode, the abutting portion abuts against the electrode assembly in the thickness direction of the wall portion so that an exhaust channel can be formed between the electrode assembly and the first surface, and the exhaust channel is configured to guide gas in the shell to the pressure relief mechanism. The battery monomer can relieve the phenomenon that the electrode assembly blocks or blocks the pressure relief mechanism so as to improve the internal exhaust smoothness of the battery monomer when thermal runaway occurs, so that the pressure relief rate of the battery monomer can be improved, the explosion or burst risk caused by untimely pressure relief of the battery monomer can be reduced, and the service life of the battery monomer is prolonged. And the use reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. Among them, batteries, as core components of new energy vehicles, have higher requirements in terms of reliability.

[0003] In battery technology, in order to ensure the safety of battery cells, a pressure relief mechanism for releasing the internal pressure of the battery cells is generally provided on the outer shell of the battery cells, so that when thermal runaway occurs in the battery cells, the pressure relief mechanism can be actuated and release the internal pressure of the battery cells. However, the pressure relief rate of existing battery cells when thermal runaway occurs is low, which makes the battery cells have the risk of explosion or burst due to untimely pressure relief, resulting in low reliability of the battery cells. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the reliability of the battery cell.

[0005] In the first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly and a pressure relief mechanism; the shell has a wall portion; the electrode assembly is accommodated in the shell; the pressure relief mechanism is arranged on the wall portion, and the pressure relief mechanism is configured to release the internal pressure of the battery cell; wherein the wall portion has a first surface facing the electrode assembly, and the first surface is convexly provided with an abutment portion, and along the thickness direction of the wall portion, the abutment portion abuts against the electrode assembly to form an exhaust channel between the electrode assembly and the first surface, and the exhaust channel is configured to guide the gas inside the shell to the pressure relief mechanism.

[0006] In the above technical solution, an abutment portion is convexly provided on the first surface of the wall portion facing the electrode assembly, and the abutment portion can be abutted against the electrode assembly in the thickness direction of the wall portion, so that an exhaust channel can be formed between the electrode assembly and the first surface through the supporting effect of the abutment portion, so that the electrode assembly and the pressure relief mechanism are arranged at intervals, so that when thermal runaway occurs in the battery cell, the thermal runaway gas inside the shell can be guided to the pressure relief mechanism through the exhaust channel, so that when the pressure relief mechanism releases the internal pressure of the battery cell, the phenomenon of the electrode assembly blocking or clogging the pressure relief mechanism is effectively alleviated, so as to improve the internal exhaust smoothness of the battery cell when thermal runaway occurs, and then the pressure relief rate of the battery cell can be effectively improved, which is beneficial to reduce the risk of explosion or bursting of the battery cell caused by untimely pressure relief, so as to improve the reliability of the battery cell.

[0007] In some embodiments, in a plane perpendicular to the thickness direction of the wall portion, an orthographic projection of the abutting portion does not overlap with an orthographic projection of the pressure relief mechanism.

[0008] In the above technical solution, by setting the orthographic projections of the abutment portion and the pressure relief mechanism in a plane perpendicular to the thickness direction of the wall portion to be non-overlapping, so that the abutment portion does not cover or block the pressure relief mechanism, the phenomenon of the abutment portion blocking or clogging the pressure relief mechanism can be effectively alleviated, thereby improving the exhaust smoothness of the battery cell when thermal runaway occurs, which is beneficial to improving the pressure relief rate of the battery cell.

[0009] In some embodiments, a plurality of abutting portions are protruded from the first surface, and the plurality of abutting portions are arranged at intervals.

[0010] In the above technical solution, by protruding a plurality of abutting portions on the first surface and arranging the plurality of abutting portions at intervals, the effect of separating the electrode assembly and the pressure relief mechanism by the abutting portions is enhanced while the gas inside the outer shell can pass through the gaps between the plurality of abutting portions, which is beneficial to reduce the obstruction of the abutting portions to the gas inside the outer shell, thereby effectively improving the internal exhaust smoothness of the battery cell when thermal runaway occurs.

[0011] In some embodiments, a plurality of abutments are disposed around the pressure relief mechanism.

[0012] In the above technical solution, by arranging a plurality of abutment portions as a structure surrounding and spaced apart on the outer peripheral side of the pressure relief mechanism, the effect of the plurality of abutment portions separating the electrode assembly and the pressure relief mechanism can be further enhanced, so as to further alleviate the phenomenon that the electrode assembly blocks or obstructs the pressure relief mechanism, thereby helping to reduce the risk of explosion or burst of the battery cell caused by untimely pressure relief, so as to improve the reliability of the battery cell.

[0013] In some embodiments, the battery cell includes a plurality of electrode assemblies, and each electrode assembly abuts against at least one abutting portion along a thickness direction of the wall portion.

[0014] In the above technical solution, a plurality of electrode assemblies are accommodated in the outer shell of the battery cell, and each electrode assembly abuts against at least one abutting portion, so that while the capacity of the battery cell is increased, each electrode assembly and the pressure relief mechanism can be spaced apart in the thickness direction of the wall portion, so that when the pressure relief mechanism releases the internal pressure of the battery cell, the phenomenon of multiple electrode assemblies blocking or clogging the pressure relief mechanism is alleviated, thereby achieving a large-capacity battery cell while also improving the pressure relief effect and pressure relief rate of the battery cell, thereby improving the reliability of the battery cell.

[0015] In some embodiments, a plurality of electrode assemblies are stacked along a first direction; a plurality of rows of abutment portions arranged at intervals along the first direction are protruding from the first surface, each row of abutment portions includes a plurality of abutment portions arranged at intervals along a second direction, and the first direction, the second direction and the thickness direction of the wall portion are perpendicular to each other; wherein, along the thickness direction of the wall portion, a plurality of abutment portions in each row of abutment portions abut against one electrode assembly.

[0016] In the above technical solution, by arranging multiple electrode assemblies into a structure stacked along a first direction, and correspondingly protruding multiple rows of abutment portions arranged along the first direction on the first surface, and each row of abutment portions is provided with multiple abutment portions arranged at intervals along the second direction, each electrode assembly can abut against multiple abutment portions in a row to enhance the effect of the abutment portions separating the electrode assemblies and the pressure relief mechanism, which is beneficial to further alleviate the phenomenon that the electrode assemblies block or clog the pressure relief mechanism.

[0017] In some embodiments, a protrusion is formed at one end of the electrode assembly abutting against the abutting portion along the thickness direction of the wall portion, and the protrusion contacts the wall portion.

[0018] In the above technical solution, by providing a protrusion on one end of the electrode assembly that abuts against the abutting portion, and the protrusion contacts the wall portion, on the one hand, the contact area between the electrode assembly and the outer shell can be increased, which is beneficial to improving the heat dissipation effect of the battery cell; on the other hand, the contact area between the electrode assembly and the electrolyte contained in the outer shell can be increased, and the electrode assembly can be in contact with the electrolyte deposited on the wall portion, thereby improving the effect of the electrode assembly being infiltrated by the electrolyte, which is beneficial to improving the performance of the battery cell.

[0019] In some embodiments, in a plane perpendicular to the thickness direction of the wall portion, an orthographic projection of the protrusion does not overlap with an orthographic projection of the pressure relief mechanism.

[0020] In the above technical solution, the orthographic projections of the protrusion of the electrode assembly and the pressure relief mechanism in a plane perpendicular to the thickness direction of the wall are set to be non-overlapping, so that the protrusion of the electrode assembly does not cover or block the pressure relief mechanism, thereby effectively alleviating the phenomenon that the protrusion of the electrode assembly blocks or obstructs the pressure relief mechanism, thereby improving the exhaust smoothness of the battery cell when thermal runaway occurs, which is beneficial to improving the pressure relief rate of the battery cell.

[0021] In some embodiments, the electrode assembly includes a first pole piece and a second pole piece with opposite polarities, and at least one of the first pole piece and the second pole piece is formed with a protrusion.

[0022] In the above technical solution, a protrusion is formed in at least one of the first pole piece and the second pole piece of the electrode assembly so that the first pole piece and / or the second pole piece has a partially protruding structure, which is beneficial to increase the energy density of the battery cell.

[0023] In some embodiments, the abutment portion is integrally formed with the wall portion.

[0024] In the above technical solution, by arranging the abutting portion and the wall portion as an integrally formed structure, that is, the abutting portion and the wall portion are an integrated structure, it is beneficial to improve the structural stability and reliability of the abutting portion protruding on the first surface, so as to alleviate the phenomenon of the abutting portion falling off during use, and further help to improve the use stability of the battery cell.

[0025] In some embodiments, along the thickness direction of the wall portion, the wall portion has a second surface facing away from the electrode assembly, and a groove is formed on the second surface at a position corresponding to the abutting portion.

[0026] In the above technical solution, a groove is formed on the second surface of the wall portion away from the electrode assembly and at a position corresponding to the abutting portion, so that the abutting portion of the wall portion is a structure that can be formed by stamping, so as to form an abutting portion and a groove on both sides of the wall portion respectively, which is conducive to reducing the difficulty of protruding the abutting portion on the first surface of the wall portion, thereby reducing the difficulty of manufacturing the battery cell and improving the production efficiency of the battery cell.

[0027] In some embodiments, the abutting portion is separately disposed from the wall portion, and the abutting portion is connected to the first surface.

[0028] In the above technical solution, by arranging the abutting portion and the wall portion as a separate structure, that is, the abutting portion and the wall portion are a separate structure, and the abutting portion is connected to the first surface of the wall portion, the battery cell adopting this structure can reduce the difficulty of forming the abutting portion on the first surface, thereby reducing the difficulty of manufacturing the battery cell and improving the production efficiency of the battery cell.

[0029] In some embodiments, the outer shell includes a shell and an end cover; the shell includes an integrally formed first wall and a second wall, the first wall is arranged around the second wall, along the thickness direction of the wall portion, one end of the first wall is connected to the second wall, and the other end is enclosed to form an opening, the first wall and the second wall jointly define a accommodating cavity for accommodating the electrode assembly; the end cover closes the opening; the second wall is a wall portion.

[0030] In the above technical solution, by setting the wall portion of the outer shell as a second wall of the shell that is arranged opposite to the end cover in the thickness direction of the wall portion, the battery cell adopting this structure can make the wall portion equipped with the pressure relief mechanism away from the end cover, so that there is no direct connection relationship between the wall portion and the end cover, thereby alleviating the phenomenon that the stress generated when the shell and the end cover are assembled and connected to each other acts on the pressure relief mechanism, thereby reducing the risk of damage to the pressure relief mechanism or reduction in structural strength, and further alleviating the phenomenon of premature actuation of pressure relief of the pressure relief mechanism, thereby improving the service life and reliability of the battery cell.

[0031] In some embodiments, the housing includes a shell and an end cover; a receiving cavity with an opening is formed inside the shell, and the receiving cavity is used to receive the electrode assembly; the end cover closes the opening; wherein the end cover is a wall portion.

[0032] In the above technical solution, by setting the wall portion of the outer shell as an end cover for closing the opening of the shell, the battery cell adopting this structure is convenient for assembling the pressure relief mechanism to the wall portion, which is beneficial to reducing the difficulty of assembling the pressure relief mechanism to the wall portion, thereby reducing the difficulty of assembling the battery cell and improving the production efficiency of the battery cell.

[0033] In a second aspect, an embodiment of the present application further provides a battery, comprising the above-mentioned battery cell.

[0034] In some embodiments, along the thickness direction of the wall portion, the wall portion has a second surface facing away from the electrode assembly, and a groove is formed at a position of the second surface corresponding to the abutment portion; wherein the battery also includes a fixing member, the fixing member has a third surface facing the second surface in the thickness direction of the wall portion, and a snap-fit ​​portion is protruding from the third surface, and the snap-fit ​​portion is plugged into the groove.

[0035] In the above technical solution, a groove is formed on the wall of the shell away from the second surface of the electrode assembly and at a position corresponding to the abutment portion, so that the abutment portion on the wall can be a structure that can be formed by stamping, which is convenient for processing and manufacturing, and is conducive to reducing the difficulty of forming the abutment portion on the first surface of the wall. In addition, by convexly providing a clamping portion on the third surface of the fixing member facing the second surface, the clamping portion can be plugged and matched with the groove on the wall to achieve fastening and limiting the battery cell, which is conducive to improving the structural stability and reliability of the battery cell when assembled into the battery, so as to reduce the shaking or movement of the battery cell during use, and further effectively reduce the risk of displacement of the battery cell or collision with other components, so as to improve the stability and service life of the battery.

[0036] In some embodiments, a plurality of grooves are formed on the second surface, a plurality of clamping portions are protruded from the third surface, and each clamping portion is plugged into and matched with a groove.

[0037] In the above technical solution, by arranging a plurality of grooves on the second surface of the wall portion, and correspondingly arranging a plurality of snap-fitting portions on the third surface of the fixing member, each snap-fitting portion can be plugged into and matched with a groove, so that the battery cell can be assembled with the plurality of snap-fitting portions of the fixing member through the plurality of grooves on the wall portion, thereby facilitating further improving the effect of fastening and limiting the battery cell, further reducing the shaking or movement of the battery cell during use, and further reducing the risk of displacement of the battery cell or collision with other components, so as to improve the stability and service life of the battery.

[0038] In some embodiments, the second surface abuts the third surface.

[0039] In the above technical solution, by making the second surface of the wall portion and the third surface of the fixing member abut against each other, the wall portion is a structure that abuts against the fixing member, thereby further improving the assembly stability between the battery cell and the fixing member, and improving the effect of the mutual insertion and matching between the clamping portion and the groove. In addition, by setting the second surface of the wall portion and the third surface of the fixing member to a structure that abuts against each other, the size of the gap between the battery cell and the fixing member can be reduced, thereby saving the space jointly occupied by the battery cell and the fixing member in the thickness direction of the wall portion, which is conducive to improving the internal space utilization of the battery.

[0040] In some embodiments, an exhaust cavity is formed inside the fixing member, and a pressure relief port is provided on the third surface, and the pressure relief port is communicated with the exhaust cavity; wherein the pressure relief mechanism and the pressure relief port are arranged opposite to each other along the thickness direction of the wall portion.

[0041] In the above technical solution, an exhaust cavity is further provided inside the fixing part, and a pressure relief port which is interconnected with the exhaust cavity is provided on the third surface of the fixing part. By setting the pressure relief mechanism of the battery cell as a structure which is arranged opposite to the pressure relief port in the thickness direction of the wall portion, when thermal runaway occurs in the battery cell, the gas released by the pressure relief mechanism can directly enter the exhaust cavity through the pressure relief port, and be further discharged through the exhaust cavity. On the one hand, a battery adopting such a structure does not need to separately provide an exhaust component for the pressure relief mechanism arranged on the wall portion, which is conducive to reducing the difficulty of assembling the battery and reducing the manufacturing cost of the battery. On the other hand, it can improve the exhaust smoothness of the pressure relief mechanism arranged on the wall portion, which is conducive to alleviating the phenomenon that the pressure relief mechanism is blocked or blocked by the fixing part, so as to improve the pressure relief rate of the battery cell, thereby reducing the risk of explosion or bursting of the battery cell due to untimely pressure relief, so as to improve the reliability of the battery. In addition, the structure in which the clamping portion of the fixing part is inserted into the groove of the wall can also alleviate the phenomenon of battery cells moving when the pressure relief mechanism releases pressure, so as to reduce the risk of the pressure relief mechanism being misaligned with the pressure relief port due to the movement of the battery cells, thereby improving the stability and reliability of the pressure relief of the battery cells during thermal runaway.

[0042] In some embodiments, along the thickness direction of the wall portion, a projection of the pressure relief mechanism is located inside the pressure relief port.

[0043] In the above technical solution, by setting the projection of the pressure relief mechanism in the thickness direction of the wall to be located within the pressure relief port, the pressure relief port can receive the gas released from any position of the pressure relief mechanism, thereby further improving the exhaust smoothness of the pressure relief mechanism arranged on the wall, thereby further improving the pressure relief rate of the battery cell.

[0044] In some embodiments, a flow channel is formed inside the fixing member, and the flow channel is used to accommodate a heat exchange medium, and the heat exchange medium is configured to exchange heat with the battery cell.

[0045] In the above technical solution, a flow channel is further provided inside the fixing part so that the flow channel of the fixing part can accommodate a heat exchange medium for heat exchange with the battery cell, so that the fixing part can also play a role in managing the temperature of the battery cell. The battery adopting this structure can, on the one hand, integrate the thermal management component for managing the temperature of the battery cell into the fixing part, which is beneficial to reduce the difficulty of assembling the battery and the manufacturing cost of the battery. On the other hand, in the structure in which the clamping part of the fixing part is inserted into the groove of the wall part, the contact area between the battery cell and the fixing part can be increased, thereby increasing the heat exchange area between the battery cell and the fixing part, so as to enhance the effect of the fixing part in managing the temperature of the battery cell.

[0046] In some embodiments, along the thickness direction of the wall portion, both sides of the fixing member have a third surface, and both sides of the fixing member are provided with battery cells, and the second surfaces of the battery cells on both sides of the fixing member are arranged facing each other.

[0047] 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 battery cells can be arranged on both sides of the fixing member, so that the battery cells located on both sides of the fixing member can be fixed and limited by one fixing member, thereby enabling the battery cells located on both sides of the fixing member to share one fixing member. On the one hand, it can save the manufacturing cost of the battery and reduce the difficulty of assembling the battery. On the other hand, it can optimize the internal space of the battery to improve the utilization rate of the internal space of the battery.

[0048] In some embodiments, the battery includes a plurality of battery cells stacked along a first direction, the first direction being perpendicular to the thickness direction of the wall; wherein, along the thickness direction of the wall, the second surfaces of the plurality of battery cells are all arranged facing the third surface, and a clamping portion is protruding from the third surface corresponding to each battery cell.

[0049] In the above technical solution, the battery is provided with a plurality of battery cells stacked along a first direction, and a clamping portion is convexly provided on the third surface of the fixing member corresponding to each battery cell, so that the plurality of battery cells stacked along the first direction share one fixing member, and the plurality of battery cells are fastened to one fixing member. The battery adopting such a structure can, on the one hand, save the manufacturing cost of the battery and reduce the difficulty of assembling the battery, and can optimize the internal space of the battery; on the other hand, when the battery cell expands along the first direction during use, the change in the spacing between two adjacent battery cells in the first direction can be reduced, so that the torque or pulling force of the busbar component connected between the two adjacent battery cells can be absorbed and distributed by the fixing member, thereby reducing the pulling phenomenon between the battery cell and the busbar component, which is beneficial to reducing the risk of electrical connection failure between the battery cells, so as to improve the stability and service life of the battery.

[0050] In some embodiments, along the first direction, the housing has two opposite fourth surfaces, the fourth surface is the surface with the largest area among the outer surfaces of the housing, and the fourth surface is perpendicular to the first direction.

[0051] In the above technical solution, the fourth surface with the largest area on the outer surface of the shell is set to a structure that is perpendicular to the first direction, so that multiple battery cells are stacked in the thickness direction of the battery cells. The battery cells can be constrained and restricted in the direction of greater expansion through the fixing parts, so as to alleviate the pulling phenomenon between the battery cells and the busbar components in the direction of the greatest expansion of the battery cells, which is beneficial to further reduce the risk of electrical connection failure between the battery cells.

[0052] In some embodiments, the battery also includes a box body, an assembly space is formed inside the box body, the battery cells and the fixings are both accommodated in the assembly space, and the fixings are connected to the box body; wherein the box body includes a first box body and a second box body arranged along a first direction, the first box body and the second box body cover each other and jointly define the assembly space.

[0053] In the above technical solution, by arranging the relative first box body and the second box body into a structure arranged along the first direction and covering each other, 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 stacked along the first direction can be a structure lying flat in the box body. On the one hand, it is convenient for assembly and helps to reduce the difficulty of assembling the battery cells in the box body. On the other hand, the fixing parts can constrain and limit the plurality of battery cells in the direction of greater expansion, so as to alleviate the pulling phenomenon between the battery cells and the convergence components in the direction of the greatest expansion of the battery cells.

[0054] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell or battery, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0056] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0057] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0058] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0059] Figure 4 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0060] Figure 5 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0061] Figure 6 A front view of a shell of a housing provided in some embodiments of the present application facing the first surface in the thickness direction of the wall portion;

[0062] Figure 7 A partial cross-sectional view of a housing shell provided for some embodiments of the present application;

[0063] Figure 8 A front view of a shell of a housing provided for some embodiments of the present application facing the second surface in a thickness direction of the wall portion;

[0064] Fig. 9 A cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0065] Fig.10 A schematic diagram of assembling a battery cell and a fixing member provided in some embodiments of the present application;

[0066] Fig.11 A schematic diagram of the structure of a battery fixing member provided in some embodiments of the present application;

[0067] Fig.12 A cross-sectional view of a battery fixing member provided in some embodiments of the present application.

[0068] Icons: 1000-vehicle; 100-battery; 10-casing; 11-first casing body; 12-second casing body; 20-battery cell; 21-casing; 211-wall; 2111-first surface; 2112-abutting portion; 2113-second surface; 2114-groove; 212-casing; 2121-accommodating chamber; 2122-opening; 213-end cover; 214-fourth surface; 22-electrode assembly; 221-first pole ear; 222-second pole ear; 223-protrusion; 23-pressure relief mechanism; 24-exhaust channel; 25-electrode terminal; 26-current collecting member; 30-fixing member; 31-third surface; 32-clamping portion; 33-exhaust chamber; 34-pressure relief port; 35-flow channel; 200-controller; 300-motor; X-thickness direction of the wall; Y-first direction; Z-second direction. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0070] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0071] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0072] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0074] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0075] The term "plurality" used in the present application refers to two or more (including two).

[0076] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0077] 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 storage battery, etc., which is not limited in the embodiments of the present application.

[0078] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0079] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0080] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0081] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may 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 substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0082] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), 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 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and its modified compounds, etc.

[0083] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0084] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0085] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0086] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0087] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0088] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0089] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0090] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0091] In some embodiments, the separator is a separator membrane. There may be many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability may be selected.

[0092] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0093] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0094] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0095] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0096] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl 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, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may 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, methyltetrahydrofuran, diphenyl ether and crown ether.

[0097] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0098] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0099] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0100] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0101] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0102] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0103] In some embodiments, the electrode assembly is a laminate structure.

[0104] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0105] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0106] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0107] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0108] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0109] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0110] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0111] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0112] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes but is not limited to a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc.

[0113] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0114] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0115] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0116] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0117] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0118] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The development of battery technology must consider many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, the safety of the battery also needs to be considered.

[0119] For a general battery cell, the battery cell usually includes a shell and an electrode assembly contained in the shell, and a pressure relief mechanism is usually provided on the shell, so that the pressure relief mechanism can be broken when the battery cell has thermal runaway to release the internal pressure of the battery cell. In the process of using the battery cell, the electrode assembly is very easy to abut and cover the pressure relief mechanism, especially in the structure where the pressure relief mechanism is arranged at the bottom of the battery cell, that is, the pressure relief mechanism is located below the electrode assembly. When the battery cell has thermal runaway, the electrode assembly is very easy to block the pressure relief mechanism, so as to cause the pressure relief mechanism to be poor, so that the pressure relief rate of the battery cell is low when thermal runaway occurs, thereby causing the battery cell to have the risk of explosion or bursting due to untimely pressure relief, which is not conducive to improving the reliability of the battery cell.

[0120] Based on the above considerations, in order to solve the problem of low reliability of battery cells, an embodiment of the present application provides a battery cell, which includes a shell, an electrode assembly and a pressure relief mechanism. The shell has a wall portion. The electrode assembly is accommodated in the shell. The pressure relief mechanism is arranged on the wall portion, and the pressure relief mechanism is configured to release the internal pressure of the battery cell. The wall portion has a first surface facing the electrode assembly, and the first surface is convexly provided with an abutment portion. Along the thickness direction of the wall portion, the abutment portion abuts against the electrode assembly so that an exhaust channel is formed between the electrode assembly and the first surface, and the exhaust channel is configured to guide the gas inside the shell to the pressure relief mechanism.

[0121] In a battery cell of this structure, an abutment portion is protruded on the first surface of the wall portion facing the electrode assembly, and the abutment portion can be used for the electrode assembly to abut in the thickness direction of the wall portion, so that an exhaust channel can be formed between the electrode assembly and the first surface through the supporting effect of the abutment portion, so that the electrode assembly and the pressure relief mechanism are arranged at intervals, so that when thermal runaway occurs in the battery cell, the thermal runaway gas inside the outer shell can be guided to the pressure relief mechanism through the exhaust channel, so that when the pressure relief mechanism releases the internal pressure of the battery cell, the phenomenon of the electrode assembly blocking or clogging the pressure relief mechanism is effectively alleviated, so as to improve the internal exhaust smoothness of the battery cell when thermal runaway occurs, and then the pressure relief rate of the battery cell can be effectively improved, which is beneficial to reduce the risk of explosion or bursting of the battery cell caused by untimely pressure relief, so as to improve the reliability of the battery cell.

[0122] The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is helpful to alleviate the problem of explosion or burst of the battery cells due to untimely pressure relief, thereby improving the reliability of the battery cells.

[0123] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0124] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0125] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source or a power source for the vehicle 1000, etc. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0126] In some embodiments of the present application, the battery 100 can not only serve as an operating power source or a use power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0127] Please refer to Figure 2 and Figure 3 , Figure 2 The structure explosion diagram of the battery 100 provided in some embodiments of the present application is shown in FIG. Figure 3 The schematic diagram of the structure of the battery cell 20 provided in some embodiments of the present application. The battery 100 comprises a box body 10 and a battery cell 20 , and the battery cell 20 is used to be accommodated in the box body 10 .

[0128] The box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, and 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 jointly define an assembly space; the first box body 11 and the second box body 12 may 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.

[0129] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube. Figure 2 In the embodiment, the box body 10 is in the shape of a rectangular parallelepiped.

[0130] In the battery 100, the battery cell 20 disposed in the box 10 may be one or more. When there are more than one battery cell 20 disposed in the box 10, the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 may be accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules may be connected in series, in parallel, or in mixed connection to form a whole, and then the whole may be accommodated in the box 10.

[0131] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is used to connect the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0132] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in a rectangular parallelepiped, a cylinder, a prism or other shapes. For example, Figure 3 In the figure, the battery cell 20 is a rectangular parallelepiped structure.

[0133] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 4 This is an exploded view of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 5 A cross-sectional view of a battery cell 20 provided in some embodiments of the present application, Figure 6 A front view of the shell 212 of the housing 21 provided in some embodiments of the present application facing the first surface 2111 in the thickness direction X of the wall portion, Figure 7 A partial cross-sectional view of a shell 212 of a shell 21 provided in some embodiments of the present application. The present application provides a battery cell 20, which includes a shell 21, an electrode assembly 22 and a pressure relief mechanism 23. The shell 21 has a wall portion 211. The electrode assembly 22 is accommodated in the shell 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 of the battery cell 20. The wall portion 211 has a first surface 2111 facing the electrode assembly 22, and the first surface 2111 is convexly provided with an 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, and the exhaust channel 24 is configured to guide the gas inside the shell 21 to the pressure relief mechanism 23.

[0134] The housing 21 can also be used to contain electrolyte, such as electrolyte. The housing 21 can be in various structural forms. The housing 21 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0135] In some embodiments, the housing 21 may include a shell 212 and an end cap 213, wherein a accommodating cavity 2121 is formed inside the shell 212, and the accommodating cavity 2121 has an opening 2122, that is, the shell 212 is a hollow structure with one end open, and the end cap 213 covers the opening 2122 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0136] Optionally, the shell 212 includes an integrally formed first wall and a second wall, the first wall is arranged around the second wall, one end of the first wall is connected to the second wall, and the other end is enclosed to form an opening 2122, and the end cover 213 covers the opening 2122 and is arranged opposite to the second wall.

[0137] It should be noted that the wall portion 211 provided with the pressure relief mechanism 23 may be the end cover 213 of the housing 21, or may be one of the multiple walls of the housing 212. Figure 4 and Figure 5 In the embodiment, the wall portion 211 is a second wall of the housing 212 disposed opposite to the end cover 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 cover 213 and the wall portion 211, and is also the thickness direction of the end cover 213. Of course, in other embodiments, the wall portion 211 may also be the end cover 213 of the housing 21, or may also be a first wall of the housing 212 and the end cover 213 that are adjacent to and abut against each other.

[0138] When assembling the battery cell 20 , the electrode assembly 22 may be placed in the housing 212 first, and the housing 212 may be filled with electrolyte. The end cap 213 may then be placed on the opening 2122 of the housing 212 to seal the opening 2122 of the housing 212 .

[0139] The shell 212 can be in various shapes, such as a cylinder, a cuboid, etc. The shape of the shell 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, the shell 212 can be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the shell 212 can be a cuboid structure. Of course, the end cap 213 can also be in various structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 3 and Figure 4 In the embodiment, the housing 212 is a rectangular parallelepiped structure.

[0140] It is understandable that the outer shell 21 is not limited to the above structure, and the outer shell 21 may also be other structures. For example, the outer shell 21 includes a shell body 212 and two end caps 213. The shell body 212 is a hollow structure with openings 2122 on opposite sides. One end cap 213 corresponds to an opening 2122 of the shell body 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0141] In the embodiment of the present application, 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 pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0142] Optionally, the pressure relief mechanism 23 and the wall portion 211 of the housing 21 may be an integrally formed structure or a separately provided structure. If the pressure relief mechanism 23 and the wall portion 211 are a separate structure, the pressure relief mechanism 23 may be connected to the wall portion 211 by welding or the like, and correspondingly, the pressure relief mechanism 23 may be a pressure relief mechanism 23 such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve; if the pressure relief mechanism 23 and the wall portion 211 are an integrally formed structure, the pressure relief mechanism 23 is an area on the wall portion 211 where a weak structure is formed, for example, an area on the wall portion 211 where a notch groove is provided.

[0143] The wall portion 211 has a first surface 2111 facing the electrode assembly 22, and the first surface 2111 is protrudingly provided with abutment 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 2112 is arranged 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 2112 is connected to the first surface 2111.

[0144] Optionally, the abutting portion 2112 and the wall portion 211 may be an integrally formed structure, that is, the abutting portion 2112 and the wall portion 211 are an integral structure, or may be a split structure, that is, the abutting portion 2112 and the wall portion 211 are a split structure. Figure 7 , and please refer to Figure 8 , Figure 8 A front view of the shell 212 of the outer shell 21 provided in some embodiments of the present application faces the second surface 2113 in the thickness direction X of the wall portion, the abutment portion 2112 and the wall portion 211 are an integrally formed structure, 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 and at a position corresponding to the abutment portion 2112, so that the abutment portion 2112 protruding from the first surface 2111 is an integrated structure that can be formed by a stamping process.

[0145] Along the thickness direction X of the wall, 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 to say, the abutting portion 2112 supports and separates 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, so that an exhaust gap is formed between the electrode assembly 22 and the first surface 2111 of the wall 211, and the exhaust gap is the exhaust channel 24 formed between the electrode assembly 22 and the first surface 2111 of the wall 211.

[0146] The exhaust channel 24 is configured to guide the gas inside the outer shell 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 channel 24 can be connected to the outside of the outer shell 21 through the pressure relief mechanism 23, so that the gas inside the outer shell 21 can pass through the exhaust channel 24 and the pressure relief mechanism 23 in sequence and then be discharged to the outside of the outer shell 21.

[0147] It should be noted that the electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs. The structure of the electrode assembly 22 can be various. For example, the electrode assembly 22 can be a winding structure formed by winding a first pole piece, a separator, and a second pole piece, or a stacked structure formed by stacking a first pole piece, a separator, and a second pole piece. The polarities of the first pole piece and the second pole piece are opposite, that is, the first pole piece and the second pole piece are respectively the positive pole piece and the negative pole piece of the electrode assembly 22.

[0148] Exemplarily, the isolation member is an isolation membrane, and a main material of the isolation membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0149] A first pole ear 221 is formed at one end of the first pole piece, and a second pole ear 222 is formed at one end of the second pole piece. The first pole ear 221 and the second pole ear 222 are respectively used for inputting or outputting the positive electrode and the negative electrode of the electrode assembly 22 . If the first electrode sheet is a positive electrode sheet, the first electrode ear 221 is used to output the positive electrode of the electrode assembly 22, and the first electrode ear 221 is a component formed by mutually stacking and connecting the regions of the first electrode sheet that are not coated with the positive electrode active material layer. Correspondingly, if the second electrode sheet is a negative electrode sheet, the second electrode ear 222 is used to output the negative electrode of the electrode assembly 22, and the second electrode ear 222 is a component formed by mutually stacking and connecting the regions of the second electrode sheet that are not coated with the negative electrode active material layer; conversely, if the first electrode sheet is a negative electrode sheet, the first electrode ear 221 is used to output the negative electrode of the electrode assembly 22, and the first electrode ear 221 is a component formed by mutually stacking and connecting the regions of the first electrode sheet that are not coated with the negative electrode active material layer. Correspondingly, if the second electrode sheet is a positive electrode sheet, the second electrode ear 222 is used to output the positive electrode of the electrode assembly 22, and the second electrode ear 222 is a component formed by mutually stacking and connecting the regions of the second electrode sheet that are not coated with the positive electrode active material layer.

[0150] Exemplarily, the material of the first electrode tab 221 may be copper or aluminum, and similarly, the material of the second electrode tab 222 may also be copper or aluminum.

[0151] Optionally, the number of electrode assemblies 22 contained in the housing 21 may be one or more. Figure 4 In the embodiment, two electrode assemblies 22 are arranged in the housing 21 of the battery cell 20, and 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 assemblies 22 accommodated in the housing 21 may be one, three, four, five, six, seven or eight, etc. Among them, the thickness direction X of the wall portion 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.

[0152] In some embodiments, see Figure 3 and Figure 4 As shown, 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 .

[0153] It should be noted that the electrode terminal 25 is insulated and installed on the housing 21 , that is, no electrical connection is formed between the electrode terminal 25 and the housing 21 .

[0154] Among them, Figure 3 and Figure 4In the embodiment, the battery cell 20 includes two electrode terminals 25 , which are electrically connected to the first electrode tab 221 and the second electrode tab 222 of the electrode assembly 22 , respectively, so as to realize the input or output of the positive electrode and the negative electrode of the battery cell 20 .

[0155] Optionally, the electrode terminal 25 may be made of a variety of materials. For example, the electrode terminal 25 may be made of copper, iron, aluminum, steel, or aluminum alloy.

[0156] For example, in Figure 4 In the embodiment, the two electrode terminals 25 are both insulated and mounted on the end cap 213 of the housing 21, and the two electrode terminals 25 are arranged at intervals along the second direction Z. Correspondingly, the first pole tab 221 and the second pole tab 222 are both formed at one end of the electrode assembly 22 facing the end cap 213 in the thickness direction X of the wall, and the first pole tab 221 and the second pole tab 222 are arranged at intervals along the second direction Z. When the wall 211 is a second wall of the housing 212 disposed opposite to the end cap 213 in the thickness direction X of the wall, the electrode terminals 25 and the pressure relief mechanism 23 are respectively disposed at the two ends of the housing 21 in the thickness direction X of the wall. Of course, the structure of the battery cell 20 is not limited thereto. In other embodiments, the two electrode terminals 25 may also be both 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.

[0157] In some embodiments, see Figure 4 and Figure 5 As shown, the battery cell 20 may also include two current collecting components 26, both of which are disposed in the outer shell 21, and the two current collecting components 26 are arranged at intervals along the second direction Z, one current collecting component 26 is used to connect one electrode terminal 25 and a first pole ear 221 in a plurality of electrode assemblies 22, and the other current collecting component 26 is used to connect another electrode terminal 25 and a second pole ear 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 is beneficial to reduce the assembly difficulty between the first pole ear 221 and the electrode terminal 25 and between the second pole ear 222 and the electrode terminal 25.

[0158] Exemplarily, the material of the current collecting component 26 may be various, for example, the material of the current collecting component 26 may be copper, iron, aluminum, steel or aluminum alloy.

[0159] In the present embodiment, an abutment portion 2112 is protruded on the first surface 2111 of the wall portion 211 facing the electrode assembly 22, and the abutment portion 2112 can be abutted against the electrode assembly 22 in the thickness direction X of the wall portion, so that the exhaust channel 24 can be formed between the electrode assembly 22 and the first surface 2111 through the supporting effect of the abutment portion 2112, so that the electrode assembly 22 and the pressure relief mechanism 23 are arranged at intervals, so that when the battery cell 20 has thermal runaway, the thermal runaway gas inside the shell 21 can be guided to the pressure relief mechanism 23 through the exhaust channel 24, so that when the pressure relief mechanism 23 releases the internal pressure of the battery cell 20, the phenomenon that the electrode assembly 22 blocks or obstructs the pressure relief mechanism 23 is effectively alleviated, so as to improve the internal exhaust smoothness of the battery cell 20 when thermal runaway occurs, and then the pressure relief rate of the battery cell 20 can be effectively improved, which is beneficial to reduce the risk of explosion or bursting of the battery cell 20 caused by untimely pressure relief, so as to improve the reliability of the battery cell 20.

[0160] According to some embodiments of the present application, see Figure 5 and Figure 6 As shown, in a plane perpendicular to the thickness direction X of the wall, the orthographic projection of the abutment portion 2112 does not overlap with the orthographic projection of the pressure relief mechanism 23. In other words, the projection of the abutment portion 2112 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, that is, the abutment portion 2112 does not cover the pressure relief mechanism 23 in the thickness direction X of the wall.

[0161] In this embodiment, 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 are arranged to be non-overlapping, so that the abutment portion 2112 does not cover or block the pressure relief mechanism 23. This can effectively alleviate the phenomenon that the abutment portion 2112 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.

[0162] According to some embodiments of the present application, see Figure 6 and Figure 7 As shown, a plurality of abutting portions 2112 are protrudingly formed on the first surface 2111 , and the plurality of abutting portions 2112 are arranged at intervals.

[0163] The plurality of abutting portions 2112 are arranged at intervals, that is, in any direction perpendicular to the thickness direction X of the wall portion, the plurality of abutting portions 2112 do not contact each other, and a gap is formed between every two abutting portions 2112 .

[0164] For example, in Figure 6 In the embodiment, the abutting portion 2112 is a strip-shaped structure extending along the second direction Z. In other embodiments, the abutting portion 2112 may also be an arc-shaped structure, an “S”-shaped structure, a “V”-shaped structure, or the like.

[0165] For example, in Figure 6 In the embodiment, four abutting portions 2112 are convexly provided on the first surface 2111, and the four abutting portions 2112 include two rows of abutting portions 2112 arranged at intervals along the first direction Y, and each row of abutting portions 2112 includes two abutting portions 2112 arranged at intervals along the second direction Z, so that the four abutting portions 2112 are arranged in an array. Of course, in other embodiments, the number of abutting portions 2112 convexly provided on the first surface 2111 may also be one, two, three, five, six, etc.

[0166] In this embodiment, a plurality of abutment portions 2112 are protruded on the first surface 2111, and the plurality of abutment portions 2112 are spaced apart, thereby improving the effect of the abutment portions 2112 in separating the electrode assembly 22 and the pressure relief mechanism 23, while also enabling the gas inside the outer shell 21 to pass through the gaps between the plurality of abutment portions 2112, thereby helping to reduce the blocking phenomenon of the abutment portions 2112 on the gas inside the outer shell 21, thereby effectively improving the internal exhaust smoothness of the battery cell 20 when thermal runaway occurs.

[0167] In some embodiments, see Figure 6 As shown, a plurality of abutment portions 2112 are arranged around the pressure relief mechanism 23. In other words, the plurality of abutment portions 2112 are arranged at intervals on the outer side of the pressure relief mechanism 23 along the circumferential direction of the pressure relief mechanism 23.

[0168] In this embodiment, by setting a plurality of abutment portions 2112 as a structure surrounding and spaced apart on the outer peripheral side of the pressure relief mechanism 23, the effect of the plurality of abutment portions 2112 in separating the electrode assembly 22 and the pressure relief mechanism 23 can be further enhanced, so as to further alleviate the phenomenon that the electrode assembly 22 blocks or obstructs the pressure relief mechanism 23, thereby helping to reduce the risk of explosion or bursting of the battery cell 20 caused by untimely pressure relief, so as to improve the reliability of the battery cell 20.

[0169] According to some embodiments of the present application, see Figure 4 , Figure 5 and Figure 6 As shown, the battery cell 20 includes a plurality of electrode assemblies 22 , and along the thickness direction X of the wall portion, each electrode assembly 22 abuts against at least one abutting portion 2112 .

[0170] Exemplarily, two electrode assemblies 22 are disposed in the outer shell 21 of the battery cell 20, and the two electrode assemblies 22 are stacked along the first direction Y. Of course, in other embodiments, the plurality of electrode assemblies 22 may also be stacked along the second direction Z. Similarly, the number of electrode assemblies 22 in the outer shell 21 may also be three, four or five, etc.

[0171] Among them, each electrode component 22 abuts against at least one abutment portion 2112, that is, the first surface 2111 is protruding with multiple abutment portions 2112, the number of abutment portions 2112 is greater than or equal to the number of electrode components 22, and each electrode component 22 abuts against at least one abutment portion 2112, that is, each electrode component 22 can be abutted against only one abutment portion 2112, or can be abutted against multiple abutment portions 2112.

[0172] In this embodiment, a plurality of electrode assemblies 22 are accommodated in the outer shell 21 of the battery cell 20, and each electrode assembly 22 abuts against at least one abutting portion 2112, so that while increasing the capacity of the battery cell 20, each electrode assembly 22 and the pressure relief mechanism 23 can be spaced apart in the thickness direction X of the wall, so that when the pressure relief mechanism 23 releases the internal pressure of the battery cell 20, the phenomenon of the plurality of electrode assemblies 22 blocking or clogging the pressure relief mechanism 23 is alleviated, thereby achieving a large-capacity battery cell 20 while also improving the pressure relief effect and pressure relief rate of the battery cell 20, so as to improve the reliability of the battery cell 20.

[0173] In some embodiments, see Figure 4 , Figure 5 and Figure 6 As shown, a plurality of electrode assemblies 22 are stacked along the first direction Y. A plurality of rows of abutment portions 2112 arranged at intervals along the first direction Y are convexly provided on the first surface 2111, and each row of abutment portions 2112 includes a plurality of abutment portions 2112 arranged at intervals along the 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 of abutment portions 2112 abut against one electrode assembly 22.

[0174] Among them, 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 protrudingly provided on the first surface 2111, and each row of abutment portions 2112 is arranged corresponding to one electrode assembly 22, so that multiple abutment portions 2112 in each row of abutment portions 2112 are used for abutment against one electrode assembly 22.

[0175] For example, in Figure 4 and Figure 6In the figure, the battery cell 20 includes two electrode assemblies 22 stacked along a first direction Y. Correspondingly, two rows of abutment portions 2112 arranged at intervals along the first direction Y are protruding from the first surface 2111. Each row of abutment portions 2112 includes two abutment portions 2112 arranged at intervals along a second direction Z, so 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 another 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, five, etc.

[0176] In this embodiment, by arranging multiple electrode assemblies 22 to be stacked along the first direction Y, and correspondingly protruding 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 assembly 22 can abut against a row of multiple abutment portions 2112 to enhance the function of the abutment portions 2112 in separating the electrode assembly 22 and the pressure relief mechanism 23, which is beneficial to further alleviate the phenomenon that the electrode assembly 22 blocks or obstructs the pressure relief mechanism 23.

[0177] According to some embodiments of the present application, referring to Fig. 9 , Fig. 9 The cross-sectional view of the battery cell 20 provided in some other embodiments of the present application. Along the thickness direction X of the wall portion, a protrusion 223 is formed at one end of the electrode assembly 22 abutting against the abutting portion 2112 , and the protrusion 223 contacts the wall portion 211 .

[0178] A protrusion 223 is formed on one end of the electrode assembly 22 that abuts against the abutting portion 2112 , that is, the protrusion 223 is formed on the end surface of the electrode assembly 22 that abuts against the abutting portion 2112 .

[0179] 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 in which a portion of the electrode assembly 22 abuts against the wall portion 211 .

[0180] It should be noted that the protrusion 223 is a part of the first pole piece or the second pole piece of the electrode assembly 22 , that is, the protrusion 223 also includes active materials for performing electrochemical reactions.

[0181] It should be noted that in the embodiment where a plurality of abutting portions 2112 are protrudingly provided on the first surface 2111 and the plurality of abutting portions 2112 are disposed around the pressure relief mechanism 23 , the protrusion 223 is located outside the plurality of abutting portions 2112 .

[0182] In this embodiment, a protrusion 223 is provided on one end of the electrode assembly 22 that abuts against the abutting portion 2112, and the protrusion 223 is in contact with the wall portion 211. On the one hand, the contact area between the electrode assembly 22 and the outer shell 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 shell 21 can be increased, and the electrode assembly 22 can be in contact with the electrolyte deposited on the wall portion 211, thereby improving the effect of the electrode assembly 22 being infiltrated by the electrolyte, which is beneficial to improving the performance of the battery cell 20.

[0183] In some embodiments, see Fig. 9 As shown, in a plane perpendicular to the thickness direction X of the wall, the orthographic projection of the protrusion 223 does not overlap with the orthographic projection of the pressure relief mechanism 23. In other words, 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, that is, the protrusion 223 does not cover the pressure relief mechanism 23 in the thickness direction X of the wall.

[0184] In this embodiment, the projections of the protrusion 223 of the electrode assembly 22 and the pressure relief mechanism 23 in the plane perpendicular to the thickness direction X of the wall are arranged to be non-overlapping, so that the protrusion 223 of the electrode assembly 22 does not cover or block the pressure relief mechanism 23. This can effectively alleviate 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.

[0185] In some embodiments, the electrode assembly 22 includes a first pole piece and a second pole piece with opposite polarities, and at least one of the first pole piece and the second pole piece is formed with a protrusion 223 .

[0186] Exemplarily, in an embodiment of the present application, the first pole piece and the second pole piece are wound to form an electrode assembly 22 of a wound structure, and correspondingly, protrusions 223 are formed on both the first pole piece and the second pole piece, that is, the protrusion 223 includes both a portion of the first pole piece and a portion of the second pole piece.

[0187] In this embodiment, a protrusion 223 is formed in at least one of the first pole piece and the second pole piece of the electrode assembly 22 so that the first pole piece and / or the second pole piece has a partially protruding structure, thereby facilitating increasing the energy density of the battery cell 20 .

[0188] According to some embodiments of the present application, see Figure 6 and Figure 7 As shown, the abutment portion 2112 is integrally formed with the wall portion 211. That is, the abutment portion 2112 is a structure formed by the wall portion 211 through an integral forming process, such as stamping, casting or milling.

[0189] In this embodiment, the abutment portion 2112 and the wall portion 211 are arranged as an integrally formed structure, that is, the abutment portion 2112 and the wall portion 211 are an integral structure, which is beneficial to improving the structural stability and reliability of the abutment portion 2112 protruding from the first surface 2111, thereby alleviating the phenomenon of the abutment portion 2112 falling off during use, and further beneficial to improving the use stability of the battery cell 20.

[0190] In some embodiments, see Figure 7 and Figure 8 As shown, along the thickness direction X of the wall portion, the wall portion 211 has a second surface 2113 away from the electrode assembly 22 , and a groove 2114 is formed on the second surface 2113 at a position corresponding to the abutting portion 2112 .

[0191] Among them, the groove 2114 and the abutment portion 2112 are structures that correspond one to one in the thickness direction X of the wall portion, that is, a groove 2114 is formed on the second surface 2113 at the position corresponding to each abutment portion 2112. It should be noted that in an embodiment in which a plurality of abutment portions 2112 are formed on the first surface 2111, a plurality of grooves 2114 are also correspondingly formed on the second surface 2113, and the positions of the grooves 2114 and the abutment portions 2112 are relative and the number is the same.

[0192] Exemplarily, the abutment portion 2112 disposed on the first surface 2111 of the wall portion 211 facing the electrode assembly 22 is formed by a stamping process, so as to form the abutment portion 2112 on the first surface 2111 of the wall portion 211 facing the electrode assembly 22, and to form a groove 2114 on the second surface 2113 of the wall portion 211 facing away from the electrode assembly 22 and at a position corresponding to the abutment portion 2112. Of course, the processing method of the abutment portion 2112 disposed on the first surface 2111 of the wall portion 211 facing the electrode assembly 22 is not limited thereto. In other embodiments, the abutment portion 2112 disposed 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.

[0193] In this embodiment, a groove 2114 is formed 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, so that the abutment portion 2112 of the wall portion 211 is a structure that can be formed by stamping, so that the abutment portion 2112 and the groove 2114 are respectively 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 difficulty of manufacturing the battery cell 20 and improving the production efficiency of the battery cell 20.

[0194] It should be noted that the structure of the battery cell 20 is not limited thereto. In some embodiments, the battery cell 20 may also have other structures. For example, the abutting portion 2112 and the wall portion 211 are separately provided, and the abutting portion 2112 is connected to the first surface 2111 .

[0195] Exemplarily, the abutting portion 2112 may be connected to the first surface 2111 of the wall portion 211 by bonding, welding, bolting or other structures.

[0196] In this embodiment, the abutment portion 2112 and the wall portion 211 are arranged as a split structure, that is, the abutment portion 2112 and the wall portion 211 are a split structure, and the abutment portion 2112 is connected to the first surface 2111 of the wall portion 211. The battery cell 20 adopting this structure can reduce the difficulty of forming the abutment portion 2112 on the first surface 2111, thereby reducing the difficulty of manufacturing the battery cell 20 and improving the production efficiency of the battery cell 20.

[0197] According to some embodiments of the present application, see Figure 3 , Figure 4 and Figure 5 As shown, the housing 21 may include a shell 212 and an end cap 213. The shell 212 includes an integrally formed first wall and a second wall, the first wall is arranged around 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 is enclosed to form an opening 2122, the first wall and the second wall jointly define a housing cavity 2121 for accommodating the electrode assembly 22, the end cap 213 closes the opening 2122, and the second wall is the wall portion 211.

[0198] The shell 212 includes an integrally formed first wall and a second wall, that is, the shell 212 is manufactured by an integral molding process, such as an integral molding process such as stamping, casting or extrusion molding, that is, the first wall and the second wall of the shell 212 are an integral structure.

[0199] The second wall is the wall portion 211, that is, the wall portion 211 is a wall of the shell 212 arranged opposite to the end cover 213 in the thickness direction X of the wall portion, and correspondingly, the pressure relief mechanism 23 is arranged on the second wall of the shell 212, and correspondingly, the second wall has a first surface 2111 facing the electrode assembly 22, and abutment 2112 is protruding from the side of the second wall facing the electrode assembly 22.

[0200] In the present embodiment, by setting the wall portion 211 of the outer shell 21 as the second wall of the shell 212 which is arranged opposite to the end cover 213 in the thickness direction X of the wall portion, the battery cell 20 adopting such a structure can make the wall portion 211 equipped with the pressure relief mechanism 23 away from the end cover 213, so that there is no direct connection relationship between the wall portion 211 and the end cover 213, thereby alleviating the phenomenon that the stress generated when the shell 212 and the end cover 213 are assembled and connected to each other acts on the pressure relief mechanism 23, thereby reducing the risk of the pressure relief mechanism 23 being damaged or the structural strength being reduced, and further alleviating the phenomenon that the pressure relief mechanism 23 is actuated to release the pressure in advance, thereby improving the service life and reliability of the battery cell 20.

[0201] It should be noted that the structure of the battery cell 20 is not limited thereto. In some embodiments, the battery cell 20 may also be other structures. For example, the housing 21 may include a shell 212 and an end cover 213. The interior of the shell 212 forms a receiving cavity 2121 having an opening 2122. The receiving cavity 2121 is used to receive the electrode assembly 22. The end cover 213 closes the opening 2122. The end cover 213 is a wall portion 211. In other words, the pressure relief mechanism 23 is disposed on the end cover 213 of the housing 21. Correspondingly, the end cover 213 has a first surface 2111 facing the electrode assembly 22, and a side of the end cover 213 facing the electrode assembly 22 is convexly provided with an abutment portion 2112.

[0202] In this embodiment, by setting the wall portion 211 of the outer shell 21 as the end cover 213 of the outer shell 21 for closing the opening 2122 of the shell 212, the battery cell 20 adopting this structure is convenient for assembling the pressure relief mechanism 23 onto the wall portion 211, which is beneficial to reduce the difficulty of assembling the pressure relief mechanism 23 onto the wall portion 211, thereby reducing the difficulty of assembling the battery cell 20 and improving the production efficiency of the battery cell 20.

[0203] According to some embodiments of the present application, see Figure 2 As shown, the present application also provides a battery 100, and the battery 100 includes a battery cell 20 of any of the above solutions.

[0204] The battery 100 may further include a box body 10 , in which the battery cells 20 are accommodated.

[0205] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12 . The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20 .

[0206] 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 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures both with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0207] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a cuboid. Figure 2 In the embodiment, the box body 10 is a rectangular parallelepiped structure.

[0208] Optionally, the number of battery cells 20 disposed in the box body 10 may be one or more. Figure 2 In the embodiment, a plurality of battery cells 20 are arranged in the box 10 of the battery 100, and the plurality of battery cells 20 can be connected in series, in parallel or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are both connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by first connecting the plurality of battery cells 20 in series, in parallel or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 10.

[0209] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0210] It should be noted that, in some embodiments, the battery 100 may not be provided with a box 10, and the battery 100 includes a plurality of battery cells 20, and the battery 100 composed of a plurality of battery cells 20 may be directly assembled on an electrical device to provide electrical energy to the electrical device through the plurality of battery cells 20. In other words, the box 10 may be used as a part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the box 10 may be used as a part of the chassis structure of the vehicle 1000, for example, a part of the box 10 may become at least a part of the floor of the vehicle 1000, or a part of the box 10 may become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.

[0211] According to some embodiments of the present application, referring to Figure 2 , Figure 7 and Figure 8 , and please refer to Fig.10 and Fig.11 , Fig.10Schematic diagram of the assembly of the battery cell 20 and the fixing member 30 provided in some embodiments of the present application, Fig.11 A schematic diagram of the structure of the fixing member 30 of the battery 100 provided in some embodiments of the present application. Along the thickness direction X of the wall, the wall 211 has a second surface 2113 away from the electrode assembly 22, and a groove 2114 is formed at the position of the second surface 2113 corresponding to the abutment portion 2112. The battery 100 also includes a fixing member 30, and the fixing member 30 has a third surface 31 facing the second surface 2113 in the thickness direction X of the wall, and a clamping portion 32 is convexly provided on the third surface 31, and the clamping portion 32 is plugged into the groove 2114.

[0212] The fixing member 30 is disposed in the box body 10 and connected to the box body 10 so as to fix the fixing member 30 in the box body 10 .

[0213] The fixing part 30 has a third surface 31 facing the second surface 2113 in the thickness direction X of the wall, that is, the surface of the fixing part 30 facing the second surface 2113 in the thickness direction X of the wall is the third surface 31, that is, the fixing part 30 has a third surface 31 formed on at least one side in the thickness direction X of the wall, and the third surface 31 faces the second surface 2113.

[0214] The third surface 31 is provided with a protruding clamping portion 32, which is plugged into the groove 2114. That is, the third surface 31 is provided with a clamping portion 32, and the clamping portion 32 can be inserted into the groove 2114 of the battery cell 20 along the thickness direction X of the wall portion to clamp the battery cell 20 to the fixing member 30.

[0215] In this embodiment, a groove 2114 is formed at a position of the wall portion 211 of the housing 21 away from the second surface 2113 of the electrode assembly 22 and corresponding to the abutting portion 2112, so that the abutting portion 2112 on the wall portion 211 is a structure that can be formed by stamping, which is convenient for processing and manufacturing, and is conducive to reducing the difficulty of forming the abutting portion 2112 on the first surface 2111 of the wall portion 211. In addition, a clamping portion 32 is convexly provided on the third surface 31 of the fixing member 30 facing the second surface 2113, so that the clamping portion 32 can be plugged and matched with the groove 2114 on the wall portion 211, so as to achieve fastening and limiting of the battery cell 20, thereby facilitating the structural stability and reliability of the battery cell 20 assembled into the battery 100, reducing the shaking or swaying of the battery cell 20 during use, and thus effectively reducing the risk of displacement of the battery cell 20 or collision with other components, so as to improve the stability and service life of the battery 100.

[0216] According to some embodiments of the present application, see Figure 7 , Figure 8 , Fig.10 and Fig.11 As shown, the second surface 2113 is formed with a plurality of grooves 2114 , and the third surface 31 is protruding with a plurality of clamping portions 32 , and each clamping portion 32 is plug-fitted with a groove 2114 .

[0217] Each of the clamping portions 32 is plugged into a groove 2114 , that is, the clamping portions 32 disposed on the third surface 31 and the grooves 2114 disposed on the second surface 2113 are in a one-to-one correspondence.

[0218] For example, in Figure 8 In the embodiment, four grooves 2114 are provided on the second surface 2113 of each battery cell 20. Fig.11 In the embodiment, four clamping portions 32 are protruded from the area where the third surface 31 of the fixing member 30 and the second surface 2113 of each battery cell 20 are arranged opposite to each other, and each clamping portion 32 is clamped in one groove 2114 .

[0219] In this embodiment, a plurality of grooves 2114 are provided on the second surface 2113 of the wall portion 211, and a plurality of snap-fitting portions 32 are correspondingly provided on the third surface 31 of the fixing member 30, so that each snap-fitting portion 32 can be plugged into and matched with a groove 2114, so that the battery cell 20 can be assembled with the plurality of snap-fitting portions 32 of the fixing member 30 through the plurality of grooves 2114 on the wall portion 211, thereby facilitating further improving the effect of fastening and limiting the battery cell 20, further reducing the shaking or movement of the battery cell 20 during use, and further reducing the risk of displacement of the battery cell 20 or collision with other components, so as to improve the stability and service life of the battery 100.

[0220] In some embodiments, see Fig.10 As shown, 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.

[0221] In this embodiment, by making the second surface 2113 of the wall portion 211 and the third surface 31 of the fixing member 30 abut against each other, the wall portion 211 is a structure that abuts against the fixing member 30, thereby further improving the assembly stability between the battery cell 20 and the fixing member 30, and improving the effect of the mutual plug-in cooperation between the clamping portion 32 and the groove 2114. In addition, by setting the second surface 2113 of the wall portion 211 and the third surface 31 of the fixing member 30 to a structure that abuts against each other, the size of the gap between the battery cell 20 and the fixing member 30 can be reduced, thereby saving the space jointly occupied by the battery cell 20 and the fixing member 30 in the thickness direction X of the wall portion, which is conducive to improving the internal space utilization rate of the battery 100.

[0222] According to some embodiments of the present application, referring to Figure 5 , Figure 8 , Fig.10 and Fig.11 , and please refer to Fig.12 , Fig.12 The cross-sectional view of the fixing member 30 of the battery 100 provided in some embodiments of the present application. An exhaust cavity 33 is formed inside the fixing member 30, and a pressure relief port 34 is provided on the third surface 31, and the pressure relief port 34 is connected to the exhaust cavity 33. Along the thickness direction X of the wall, the pressure relief mechanism 23 and the pressure relief port 34 are arranged opposite to each other.

[0223] The fixing member 30 is a structure extending along the second direction Z, and the exhaust cavity 33 passes through both ends of the fixing member 30 along the second direction Z, so as to discharge the gas in the exhaust cavity 33 out of the box body 10 .

[0224] A pressure relief port 34 is provided on the third surface 31, and the pressure relief port 34 is connected to the exhaust chamber 33. That is to say, a pressure relief port 34 is provided on the fixing member 30, and two ends of the pressure relief port 34 in the thickness direction X of the wall portion respectively penetrate the third surface 31 and the cavity wall surface of the exhaust chamber 33, so that the pressure relief port 34 is formed on the third surface 31 and is connected to the exhaust chamber 33.

[0225] Along the thickness direction X of the wall, the pressure relief mechanism 23 and the pressure relief port 34 are arranged opposite to each other, that is, the pressure relief mechanism 23 is arranged facing the pressure relief port 34 in the thickness direction X of the wall, that is, at least part of the projection of the pressure relief mechanism 23 in the thickness direction X of the wall is located in 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.

[0226] In this embodiment, the interior of the fixing member 30 is further provided with an exhaust cavity 33, and a pressure relief port 34 communicating with the exhaust cavity 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, when the battery cell 20 has thermal runaway, the gas released by the pressure relief mechanism 23 can directly enter the exhaust cavity 33 through the pressure relief port 34, and further be discharged through the exhaust cavity 33. The battery 100 with such a structure is There is no need to separately set an exhaust component for the pressure relief mechanism 23 arranged on the wall 211, which is conducive to reducing the difficulty of assembling the battery 100 and the manufacturing cost of the battery 100. On the other hand, it can improve the exhaust smoothness of the pressure relief mechanism 23 arranged on the wall 211, which is conducive to alleviating the phenomenon that the pressure relief mechanism 23 is blocked or blocked by the fixing member 30, so as to improve the pressure relief rate of the battery cell 20, thereby reducing the risk of explosion or burst of the battery cell 20 caused by untimely pressure relief, so as to improve the reliability of the battery 100. In addition, in the structure where the clamping portion 32 of the fixing member 30 is inserted into the groove 2114 of the wall 211, it can also alleviate the phenomenon that the battery cell 20 moves when the pressure relief mechanism 23 releases pressure, so as to reduce the risk that the pressure relief mechanism 23 is misaligned with the pressure relief port 34 due to the movement of the battery cell 20, thereby improving the stability and reliability of the pressure relief of the battery cell 20 during thermal runaway.

[0227] In some embodiments, along the thickness direction X of the wall, the projection of the pressure relief mechanism 23 is located inside the pressure relief port 34. 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.

[0228] In this embodiment, by setting the projection of the pressure relief mechanism 23 in the thickness direction X of the wall to be located within the pressure relief port 34, the pressure relief port 34 can receive the gas released from any position of the pressure relief mechanism 23, thereby further improving the exhaust smoothness of the pressure relief mechanism 23 arranged on the wall 211, thereby further improving the pressure relief rate of the battery cell 20.

[0229] According to some embodiments of the present application, see Fig.12 As shown, a flow channel 35 may be formed inside the fixing member 30 . The flow channel 35 is used to accommodate a heat exchange medium. The heat exchange medium is configured to perform heat exchange with the battery cell 20 .

[0230] In the embodiment where the exhaust cavity 33 is formed inside the fixing member 30 , the flow channel 35 formed inside the fixing member 30 is not connected to the exhaust cavity 33 , that is, the flow channel 35 is formed in the cavity wall of the exhaust cavity 33 .

[0231] The flow channel 35 is used to accommodate a heat exchange medium, and the heat exchange medium 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 .

[0232] Exemplarily, the heat exchange medium may be a gas, such as air or hydrogen, and the fluid medium may be a liquid, such as water, a salt water solution or liquid nitrogen.

[0233] In the present embodiment, a flow channel 35 is further provided inside the fixing member 30 so that the flow channel 35 of the fixing member 30 can accommodate a heat exchange medium for heat exchange with the battery cell 20, so that the fixing member 30 can also play a role in managing the temperature of the battery cell 20. The battery 100 adopting such a structure can, on the one hand, integrate the thermal management component for managing the temperature of the battery cell 20 into the fixing member 30, which is beneficial to reduce the difficulty of assembling the battery 100 and to reduce the manufacturing cost of the battery 100. On the other hand, in the structure in which the clamping portion 32 of the fixing member 30 is inserted into the groove 2114 of the wall portion 211, the contact area between the battery cell 20 and the fixing member 30 can be increased, thereby increasing the heat exchange area between the battery cell 20 and the fixing member 30, so as to enhance the effect of the fixing member 30 in managing the temperature of the battery cell 20.

[0234] According to some embodiments of the present application, see Fig.10 , Fig.11 and Fig.12 As shown, along the thickness direction X of the wall portion, both sides of the fixing member 30 have the third surface 31, and both sides of the fixing member 30 are provided with battery cells 20, and the second surfaces 2113 of the battery cells 20 located on both sides of the fixing member 30 are arranged facing each other. That is to say, in 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 located on both sides of the fixing member 30 are arranged facing each other, so that the second surfaces 2113 of the battery cells 20 located on both sides of the fixing member 30 are respectively arranged facing the two third surfaces 31 on both sides of the fixing member 30.

[0235] In this embodiment, the fixing member 30 has a third surface 31 on both sides of the wall in the thickness direction X, so that the battery cells 20 can be arranged on both sides of the fixing member 30, so that the battery cells 20 located on both sides of the fixing member 30 can be fixed and limited by one fixing member 30, and then 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 difficulty of assembling the battery 100. On the other hand, it can optimize the internal space of the battery 100 to improve the internal space utilization of the battery 100.

[0236] According to some embodiments of the present application, see Figure 8 , Fig.10 and Fig.11 As shown, the battery 100 includes a plurality of battery cells 20 stacked along a first direction Y, and the first direction Y is perpendicular to the thickness direction X of the wall. Along the thickness direction X of the wall, the second surfaces 2113 of the plurality of battery cells 20 are all arranged facing the third surface 31, and the third surface 31 is provided with a protruding clamping portion 32 corresponding to each battery cell 20.

[0237] Among them, the second surfaces 2113 of the multiple battery cells 20 are all arranged to face the third surface 31, and the third surface 31 corresponds to each battery cell 20 and is convexly provided with a clamping portion 32. That is to say, the second surfaces 2113 of the multiple battery cells 20 stacked along the first direction Y are all structures arranged facing the third surface 31 of the fixing member 30, so that the pressure relief mechanisms 23 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, and the third surface 31 of the fixing member 30 corresponds to the area of ​​each battery cell 20 stacked along the first direction Y and is convexly provided with a clamping portion 32, so that the multiple battery cells 20 stacked along the first direction Y can be clamped and fixed on a fixing member 30.

[0238] For example, in Fig.10 In the figure, the battery 100 includes a plurality of groups of battery cells 20 arranged along a second direction Z, each group of battery cells 20 includes a plurality of battery cells 20 stacked along a first direction Y, and in the thickness direction X of the wall portion, a plurality of groups of battery cells 20 are arranged on both sides of the fixing member 30, and correspondingly, a third surface 31 of the fixing member 30 is arranged to face the second surfaces 2113 of the plurality of battery cells 20 located on one side of the fixing member 30, and another third surface 31 of the fixing member 30 is arranged to face the second surfaces 2113 of the plurality of battery cells 20 located on the other side of the fixing member 30.

[0239] For example, in Fig.10 In the embodiment, 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.

[0240] In the present embodiment, the battery 100 is provided with a plurality of battery cells 20 stacked along a first direction Y, and a clamping portion 32 is convexly provided on the third surface 31 of the fixing member 30 corresponding to each battery cell 20, so that the plurality of battery cells 20 stacked along the first direction Y share one fixing member 30, and the plurality of battery cells 20 are fastened to one fixing member 30. The battery 100 adopting such a structure can, on the one hand, save the manufacturing cost of the battery 100 and reduce the difficulty of assembling the battery 100, and can optimize the internal space of the battery 100; on the other hand, when the battery cell 20 expands along the first direction Y during use, the change in the spacing between two adjacent battery cells 20 in the first direction Y can be reduced, so that the torque or tension of the busbar component connected between the two adjacent battery cells 20 can be absorbed and distributed by the fixing member 30, thereby reducing the pulling phenomenon between the battery cell 20 and the busbar component, which is beneficial to reducing the risk of electrical connection failure between the battery cells 20, so as to improve the use stability and service life of the battery 100.

[0241] In some embodiments, see Figure 3 and Fig.10 As shown, along the first direction Y, the housing 21 has two opposite fourth surfaces 214 , the fourth surface 214 is the surface with the largest area among the outer surfaces of the housing 21 , and the fourth surface 214 is perpendicular to the first direction Y.

[0242] The housing 21 has two opposite fourth surfaces 214 , which are the surfaces with the largest area among the outer surfaces of the housing 21 . That is, the two fourth surfaces 214 are the outer surfaces of the housing 21 on both sides in the thickness direction of the battery cell 20 .

[0243] The fourth surface 214 is perpendicular to the first direction Y. That is, among the plurality of battery cells 20 stacked along the first direction Y, the fourth surfaces 214 between two adjacent battery cells 20 are arranged in the first direction Y facing each other and abutting against each other.

[0244] In this embodiment, the fourth surface 214 with the largest area on the outer surface of the shell 21 is set to a structure that is perpendicular to the first direction Y, so that the multiple battery cells 20 are stacked in the thickness direction of the battery cells 20, so that the battery cells 20 can be constrained and restricted in the direction of greater expansion through the fixing parts 30, so as to alleviate the pulling phenomenon between the battery cells 20 and the busbar components in the direction of the greatest expansion of the battery cells 20, which is beneficial to further reduce the risk of electrical connection failure between the battery cells 20.

[0245] According to some embodiments of the present application, see Figure 2As shown, the battery 100 may further include a box body 10, an assembly space is formed inside the box body 10, 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 box body 10. The box body 10 includes a first box body 11 and a second box body 12 arranged along a first direction Y, and the first box body 11 and the second box body 12 cover each other and jointly define the assembly space.

[0246] It should be noted that, in some embodiments, the battery 100 may not be provided with the box 10, and the battery 100 including the fixing member 30 and the battery cell 20 may be directly assembled and assembled to the electrical device, and correspondingly, the fixing member 30 is fixed to the electrical device, thereby providing electrical energy to the electrical device. In other words, the box 10 may be used as a part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the box 10 may be used as a part of the chassis structure of the vehicle 1000, for example, a part of the box 10 may become at least a part of the floor of the vehicle 1000, or a part of the box 10 may become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.

[0247] In this embodiment, by setting the relative first box body 11 and the second box body 12 to be arranged along the first direction Y and cover 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, so that the multiple battery cells 20 stacked along the first direction Y can be a structure lying flat in the box body 10. On the one hand, it is easy to assemble and helps to reduce the difficulty of assembling the battery cells 20 in the box body 10. On the other hand, the fixing parts 30 can constrain and limit the multiple battery cells 20 in the direction of greater expansion, so as to alleviate the pulling phenomenon between the battery cells 20 and the convergence components in the direction of the maximum expansion of the battery cells 20.

[0248] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery cell 20 or the battery 100 of any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0249] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 or the battery 100 .

[0250] According to some embodiments of the present application, see Figures 3 to 8As shown, the present application provides a battery cell 20, which includes a shell 21, an electrode assembly 22 and a pressure relief mechanism 23. The shell 21 has a wall portion 211, and the shell 21 includes a shell 212 and an end cover 213. The shell 212 includes an integrally formed first wall and a second wall. The first wall is arranged around 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 is enclosed to form an opening 2122. The first wall and the second wall jointly define a housing cavity 2121, and the end cover 213 closes the opening 2122. The second wall is the wall portion 211. The electrode assembly 22 is accommodated in the housing cavity 2121. There are multiple electrode assemblies 22, and the multiple electrode assemblies 22 are stacked along the first direction Y. 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 of the battery cell 20. Among them, 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 away from the electrode assembly 22, and the first surface 2111 is convexly provided with multiple rows of abutment portions 2112 arranged at intervals along the first direction Y, and each row of abutment portions 2112 includes multiple abutment portions 2112 arranged at intervals along the second direction Z, and the abutment portions 2112 are integrally formed with the wall portion 211, and a groove 2114 is formed at the position of the second surface 2113 corresponding to the abutment portion 2112, and 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, and 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 portion, the orthographic projection of the abutting portion 2112 does not overlap with the orthographic projection of the pressure relief mechanism 23 .

[0251] According to some embodiments of the present application, see Figures 2 to 8 as well as Figures 10 to 12As shown, the present application also provides a battery 100, which includes a case 10, a battery cell 20 and a fixing member 30. An assembly space is formed inside the case 10, and 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 case 10. The case 10 includes a first box body 11 and a second box body 12 arranged along a first direction Y, and the first box body 11 and the second box body 12 cover each other and jointly define an assembly space. The battery cell 20 includes a shell 21, an electrode assembly 22 and a pressure relief mechanism 23. The shell 21 has a wall portion 211. The electrode assembly 22 is accommodated in the accommodating cavity 2121. 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 of the battery cell 20. Along the thickness direction X of the wall, the wall 211 has a first surface 2111 facing the electrode assembly 22 and a second surface 2113 away from the electrode assembly 22. The first surface 2111 is provided with abutting portions 2112. Along the thickness direction X of the wall, the abutting portions 2112 abut against the electrode assembly 22, so that an exhaust passage 24 is formed between the electrode assembly 22 and the first surface 2111. The exhaust passage 24 is configured to guide the gas inside the housing 21 to the pressure relief mechanism 23. The second surface 2113 is provided with a groove 2114 at a position corresponding to the abutting portion 2112. The fixing member 30 has a third surface 31 facing the second surface 2113 in the thickness direction X of the wall. The third surface 31 abuts against the second surface 2113, and a clamping portion 32 is provided on the third surface 31. The clamping portion 32 is plugged into the groove 2114. The second surface 2113 is formed with a plurality of grooves 2114, and the third surface 31 is provided with a plurality of snap-fitting portions 32, each snap-fitting portion 32 being plugged into and matched with a groove 2114. An exhaust cavity 33 is formed inside the fixing member 30, and a pressure relief port 34 is provided on the third surface 31, the pressure relief port 34 is connected to the exhaust cavity 33, and the projection of the pressure relief mechanism 23 is located inside the pressure relief port 34 along the thickness direction X of the wall. A flow channel 35 is formed in the cavity wall of the exhaust cavity 33 of the fixing member 30, and the flow channel 35 is used to accommodate a heat exchange medium, and the heat exchange medium is configured to exchange heat with the battery cell 20. The box 10 contains a plurality of battery cells 20 arranged along the second direction Z, each battery cell 20 includes a plurality of battery cells 20 stacked along the first direction Y, and in the thickness direction X of the wall, a plurality of battery cells 20 are arranged on both sides of the fixing member 30, and both sides of the fixing member 30 have a third surface 31, and the second surfaces 2113 of the battery cells 20 located on both sides of the fixing member 30 are arranged facing each other, and the third surface 31 is provided with a convex clamping portion 32 corresponding to each battery cell 20. Along the first direction Y, the outer shell 21 has two opposite fourth surfaces 214, which are the largest surfaces in the outer surface of the outer shell 21, and the fourth surface 214 is perpendicular to the first direction Y, and the thickness direction X of the wall, the first direction Y and the second direction Z are perpendicular to each other.

[0252] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0253] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: a housing having a wall portion; an electrode assembly, contained in the housing; as well as a pressure relief mechanism, disposed on the wall portion, the pressure relief mechanism being configured to release internal pressure of the battery cell; Among them, the wall portion has a first surface facing the electrode assembly, and the first surface is protruding with an abutment portion. Along the thickness direction of the wall portion, the abutment portion abuts against the electrode assembly to form an exhaust channel between the electrode assembly and the first surface, and the exhaust channel is configured to guide the gas inside the outer shell to the pressure relief mechanism.

2. The battery cell according to claim 1, characterized in that: In a plane perpendicular to the thickness direction of the wall portion, an orthographic projection of the abutting portion does not overlap with an orthographic projection of the pressure relief mechanism.

3. The battery cell according to claim 1, characterized in that: A plurality of the abutting portions are protrudingly provided on the first surface, and the plurality of the abutting portions are arranged at intervals.

4. The battery cell according to claim 3, characterized in that: A plurality of abutment portions are arranged around the pressure relief mechanism.

5. The battery cell according to claim 3, characterized in that: The battery cell includes a plurality of the electrode assemblies, and each of the electrode assemblies abuts against at least one of the abutting portions along a thickness direction of the wall portion.

6. The battery cell according to claim 5, characterized in that: A plurality of the electrode assemblies are stacked along a first direction; The first surface is provided with a plurality of rows of abutment portions arranged at intervals along the first direction, each row of abutment portions includes a plurality of abutment portions arranged at intervals along the second direction, and the first direction, the second direction and the thickness direction of the wall portion are perpendicular to each other; Wherein, along the thickness direction of the wall portion, a plurality of the abutting portions in each row of abutting portions abut against one of the electrode assemblies.

7. The battery cell according to any one of claims 1 to 6, characterized in that: A protrusion is formed on one end of the electrode assembly against which the abutting portion abuts along the thickness direction of the wall portion, and the protrusion contacts the wall portion.

8. The battery cell according to claim 7, characterized in that: In a plane perpendicular to the thickness direction of the wall portion, an orthographic projection of the protrusion does not overlap with an orthographic projection of the pressure relief mechanism.

9. The battery cell according to claim 7, characterized in that: The electrode assembly includes a first pole piece and a second pole piece with opposite polarities, and at least one of the first pole piece and the second pole piece is formed with the protrusion.

10. The battery cell according to any one of claims 1 to 6, characterized in that: The abutting portion is integrally formed with the wall portion.

11. The battery cell according to claim 10, characterized in that: Along the thickness direction of the wall portion, the wall portion has a second surface away from the electrode assembly, and a groove is formed on the second surface at a position corresponding to the abutting portion.

12. The battery cell according to any one of claims 1 to 6, characterized in that: The abutting portion is separately provided from the wall portion, and the abutting portion is connected to the first surface.

13. The battery cell according to any one of claims 1 to 6, characterized in that: The housing comprises: A shell, comprising an integrally formed first wall and a second wall, wherein the first wall is arranged around the second wall, along the thickness direction of the wall portion, one end of the first wall is connected to the second wall, and the other end is enclosed to form an opening, and the first wall and the second wall jointly define a receiving cavity for receiving the electrode assembly; an end cap for closing the opening; Wherein, the second wall is the wall portion.

14. The battery cell according to any one of claims 1 to 6, characterized in that: The housing comprises: A shell body, wherein a receiving cavity with an opening is formed inside, and the receiving cavity is used to receive the electrode assembly; an end cap for closing the opening; Wherein, the end cover is the wall portion.

15. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 14.

16. The battery according to claim 15, characterized in that Along the thickness direction of the wall portion, the wall portion has a second surface away from the electrode assembly, and a groove is formed on the second surface at a position corresponding to the abutting portion; Wherein, the battery also includes a fixing member, and the fixing member has a third surface arranged facing the second surface in the thickness direction of the wall portion, and the third surface is convexly provided with a clamping portion, and the clamping portion is plug-fitted with the groove.

17. The battery according to claim 16, characterized in that The second surface is formed with a plurality of grooves, the third surface is convexly provided with a plurality of the clamping parts, and each of the clamping parts is plug-fitted with one of the grooves.

18. The battery according to claim 16, characterized in that The second surface abuts against the third surface.

19. The battery according to claim 16, characterized in that An exhaust cavity is formed inside the fixing member, and a pressure relief port is provided on the third surface, the pressure relief port being in communication with the exhaust cavity; Wherein, along the thickness direction of the wall portion, the pressure relief mechanism and the pressure relief port are arranged opposite to each other.

20. The battery according to claim 19, characterized in that Along the thickness direction of the wall portion, the projection of the pressure relief mechanism is located inside the pressure relief port.

21. The battery according to claim 16, characterized in that A flow channel is formed inside the fixing member, and the flow channel is used to accommodate a heat exchange medium, and the heat exchange medium is configured to exchange heat with the battery cell.

22. The battery according to claim 16, characterized in that Along the thickness direction of the wall portion, both sides of the fixing member have the third surface, and both sides of the fixing member are provided with the battery cells, and the second surfaces of the battery cells on both sides of the fixing member are arranged facing each other.

23. The battery according to any one of claims 16 to 22, characterized in that The battery includes a plurality of battery cells stacked along a first direction, the first direction being perpendicular to a thickness direction of the wall portion; Wherein, along the thickness direction of the wall portion, the second surfaces of the plurality of battery cells are arranged facing the third surface, and the third surface is provided with the clamping portion protrudingly corresponding to each of the battery cells.

24. The battery according to claim 23, characterized in that Along the first direction, the housing has two opposite fourth surfaces, the fourth surfaces are surfaces with the largest area among the outer surfaces of the housing, and the fourth surfaces are perpendicular to the first direction.

25. The battery according to claim 23, characterized in that The battery further comprises a box body, an assembly space is formed inside the box body, the battery cell and the fixing member are both accommodated in the assembly space, and the fixing member is connected to the box body; The box body includes a first box body and a second box body arranged along the first direction, and the first box body and the second box body cover each other and jointly define the assembly space.

26. An electrical device, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 14 or a battery according to any one of claims 15 to 25, wherein the battery cell is used to provide electrical energy.

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