Battery and electric device

Abstract

The utility model provides a battery and a power utilization device, and belongs to the technical field of batteries. The battery comprises a box body, a battery monomer group and a supporting piece, the box body comprises a bottom plate. The battery monomer group is accommodated in the box body, the battery monomer group comprises at least one battery monomer, the battery monomer comprises a shell, an electrode terminal and a pressure relief mechanism, the shell is provided with a wall part, the wall part and the bottom plate are arranged in the thickness direction of the bottom plate, and the electrode terminal and the pressure relief mechanism are arranged on the shell; at least one of the electrode terminal and the pressure relief mechanism is provided on the wall portion. The supporting piece is arranged between the wall part and the bottom plate and connected to the wall part. In the thickness direction of the base plate, the support has a first surface facing away from the wall portion, and the first surface is closer to the base plate than the electrode terminal and the pressure relief mechanism. The electrode terminal or the pressure relief mechanism of the single battery can be protected through the supporting piece, so that the risk that the single battery is impacted and damaged is reduced, the service life of the battery is prolonged, and the use reliability of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to 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. The battery consists of a box and a battery cell contained in the box. As a core component of new energy vehicles, batteries have high requirements in terms of service life and reliability. Among them, the battery usually includes a box and a plurality of battery cells contained in the box. The outer shell of the battery cell is provided with electrode terminals for inputting or outputting electrical energy. The electrode terminals protrude from the outer surface of the outer shell, and the outer shell of the battery cell is also provided with a pressure relief mechanism for releasing internal pressure. However, when the existing battery is impacted during use, it is very easy to cause the electrode terminals or pressure relief mechanisms of the battery cells to be damaged, so as to cause the battery cells to be damaged, thereby shortening the service life of the battery and reducing the reliability of use. Utility Model Content

[0003] The embodiments of the present application provide a battery and an electrical device, which can effectively improve the service life and reliability of the battery.

[0004] In a first aspect, an embodiment of the present application provides a battery, comprising a case, a battery cell group and a support; the case comprises a bottom plate; the battery cell group is accommodated in the case, the battery cell group comprises at least one battery cell, the battery cell comprises an outer shell, an electrode terminal and a pressure relief mechanism, the outer shell has a wall portion, along the thickness direction of the bottom plate, the wall portion and the bottom plate are arranged facing each other, the electrode terminal and the pressure relief mechanism are both arranged on the outer shell, and at least one of the electrode terminal and the pressure relief mechanism is arranged on the wall portion; the support member is arranged between the wall portion and the bottom plate and connected to the wall portion; wherein, along the thickness direction of the bottom plate, the support member has a first surface facing away from the wall portion, and the first surface is closer to the bottom plate than the electrode terminal and the pressure relief mechanism.

[0005] In the above technical solution, the box body has a bottom plate located at the bottom of the battery cell, the wall portion of the shell is arranged facing the bottom plate, and at least one of the electrode terminal and the pressure relief mechanism of the battery cell is arranged on the wall portion, so that at least one of the electrode terminal and the pressure relief mechanism is arranged on the side of the shell facing the bottom plate, and a support member is arranged between the bottom plate of the box body and the wall portion of the shell, the support member is connected to the wall portion, and the first surface of the support member facing away from the wall portion is closer to the bottom plate than the electrode terminal and the pressure relief mechanism. On the one hand, when the battery is subjected to a bottom ball hitting test or a bottom impact during use, the support member can play a certain supporting role on the bottom plate of the box body, so as to improve the deformation resistance of the bottom plate when subjected to external impact. This helps to reduce the phenomenon of impact or collision of battery cells due to deformation of the bottom plate. On the other hand, when the bottom plate of the box is impacted or deformed, the impact force on the bottom plate can be preferentially contacted with the support member, and the impact force on the bottom plate can be dispersed through the support member to increase the force-bearing area, thereby alleviating the phenomenon of the impact force on the bottom plate being concentrated on the battery cell, thereby reducing the local force concentration on the battery cell, thereby enhancing the protection of the electrode terminal or pressure relief mechanism of the battery cell, and further effectively reducing the risk of damage to the electrode terminal or pressure relief mechanism of the battery cell by impact, and can reduce the risk of leakage or fire and explosion of the battery cell, which is beneficial to improving the service life and reliability of the battery.

[0006] In some embodiments, along the thickness direction of the bottom plate, the first surface abuts against the bottom plate.

[0007] In the above technical solution, by abutting the first surface against the bottom plate, the support member is made to be a structure in which the two sides in the thickness direction of the bottom plate are respectively abutted against the wall of the outer shell and the bottom plate of the box body. The battery adopting this structure can reduce the size of the gap between the support member and the bottom plate. On the one hand, it can improve the internal space utilization rate of the battery, which is beneficial to improve the energy density of the battery. On the other hand, it can improve the supporting effect of the support member on the bottom plate, so as to further improve the deformation resistance of the bottom plate when subjected to external impact, which is beneficial to reduce the phenomenon of impact or collision of the battery cell due to deformation of the bottom plate.

[0008] In some embodiments, the battery cell group includes multiple battery cells, which are stacked along a first direction, and the first direction is perpendicular to the thickness direction of the base plate; wherein the support member extends along the first direction, and the support member is connected to the wall portions of the outer shells of the multiple battery cells in the battery cell group.

[0009] In the above technical solution, the battery cell group is provided with a plurality of battery cells stacked along a first direction. By setting the support member as a structure extending along the first direction, and the support member is connected to the walls of the plurality of battery cells of the battery cell group, the support member can support and protect the plurality of battery cells in the battery cell group, thereby improving the battery capacity while supporting and protecting the plurality of battery cells of the battery cell group through one support member, without the need to provide a support member for each battery cell, thereby effectively reducing the manufacturing cost of the battery, and helping to reduce the difficulty of assembling the battery, so as to improve the assembly efficiency of the battery.

[0010] In some embodiments, the battery includes multiple battery cell groups, and the multiple battery cell groups are arranged along a second direction, and the second direction is perpendicular to the thickness direction of the base plate and the first direction; wherein, along the second direction, each two adjacent battery cell groups share a support member, and the support member is connected to the wall portions of the outer shells of the battery cells of the two adjacent battery cell groups.

[0011] In the above technical solution, by sharing a support member between every two adjacent battery cell groups in the second direction, and the support member is connected to the wall portions of multiple battery cells in the two adjacent battery cell groups, the battery adopting this structure can, on the one hand, support and protect multiple battery cells in two adjacent battery cell groups by means of one support member, which is beneficial to reducing the manufacturing cost of the battery; on the other hand, the support member can distribute the impact force received by the bottom plate to the multiple battery cells in the two adjacent battery cell groups, thereby further alleviating the phenomenon that the impact force received by the bottom plate is concentrated on the battery cells, so as to further reduce the situation that the local force concentration on the battery cells, and further enhance the protection of the electrode terminals or the pressure relief mechanism of the battery cells, so as to reduce the risk of the electrode terminals or the pressure relief mechanism of the battery cells being damaged by the impact.

[0012] In some embodiments, a cavity is formed inside the support member, and the cavity passes through both ends of the support member along the first direction.

[0013] In the above technical solution, a cavity is provided inside the support member, and the cavity is provided as a structure that passes through both ends of the support member along a first direction, thereby reducing the weight of the support member and enabling the support member to have the ability to collapse and absorb energy when subjected to a large impact force. At the same time, the difficulty of forming the cavity of the support member can be reduced, which is beneficial to reducing the difficulty of manufacturing the support member.

[0014] In some embodiments, a cavity is formed inside the support member.

[0015] In the above technical solution, by setting a cavity inside the support member, on the one hand, the weight of the support member can be reduced, which is beneficial to improving the energy density of the battery. On the other hand, the support member has the ability to collapse and absorb energy when subjected to a large impact force, which is beneficial to improving the protection effect of the support member on the battery cell.

[0016] In some embodiments, the support member is adhesively connected to the wall portion.

[0017] In the above technical solution, an adhesive connection structure is used to connect the support member and the wall of the outer shell. On the one hand, it is easy to assemble and helps to reduce the difficulty of connecting the support member and the wall of the outer shell. On the other hand, it can achieve the connection and assembly between the support member and the wall of the outer shell without affecting the battery cell, which helps to alleviate the phenomenon of the support member damaging the battery cell.

[0018] In some embodiments, the elastic modulus of the material of the support member is greater than or equal to 1000 MPa.

[0019] In the above technical solution, by setting the elastic modulus of the material of the support member to be greater than or equal to 1000 MPa, the support member has sufficient rigidity, so that the supporting effect of the support member between the base plate and the battery cell can be improved when the base plate is deformed by impact, and the support member has sufficient anti-deformation ability, so that the support member can better distribute and disperse the impact force it receives.

[0020] In some embodiments, the support member is made of insulating material.

[0021] In the above technical solution, by setting the support member to be an insulating material, the battery cell will not form a circuit connection with the support member, thereby reducing the risk of short circuit inside the battery and improving the reliability of the battery.

[0022] In some embodiments, the pressure relief mechanism is disposed on the wall portion; wherein, in a plane perpendicular to the thickness direction of the bottom plate, the orthographic projection of the pressure relief mechanism does not overlap with the orthographic projection of the support member.

[0023] In the above technical solution, the pressure relief mechanism and the support member are arranged so that their orthographic projections in a plane perpendicular to the thickness direction of the base plate do not overlap, so that the support member does not cover or block the pressure relief mechanism in the thickness direction of the base plate, thereby reducing the blocking and interference effects of the support member on the pressure relief mechanism, thereby improving the smoothness of the pressure relief mechanism in releasing the internal pressure of the battery cell.

[0024] In some embodiments, the electrode terminals and the pressure relief mechanism are both disposed on the wall.

[0025] In the above technical solution, by arranging both the electrode terminal and the pressure relief mechanism on the wall, the electrode terminal and the pressure relief mechanism are both located at one end of the outer shell of the battery cell facing the bottom plate in the thickness direction of the bottom plate, thereby facilitating assembly and manufacturing, and the support member can simultaneously support and protect the electrode terminal and the pressure relief mechanism.

[0026] In some embodiments, the electrode terminal is disposed on the wall; wherein the battery further comprises a buffer member, which is disposed between the electrode terminal and the bottom plate along the thickness direction of the bottom plate, and at least a portion of the projection of the electrode terminal is located within the buffer member.

[0027] In the above technical solution, the battery is further provided with a buffer member, which is arranged between the electrode terminal and the bottom plate in the thickness direction of the bottom plate, and the buffer member covers at least a portion of the electrode terminal in the thickness direction of the bottom plate. On the one hand, the buffer member can absorb the impact force transmitted by the bottom plate when the bottom plate is deformed by impact, so as to reduce the impact force acting on the electrode terminal, thereby being able to buffer and protect the electrode terminal, so as to further reduce the risk of the battery cell being damaged by impact, which is beneficial to improving the service life and reliability of the battery. On the other hand, the buffer member can further increase the supporting effect on the bottom plate when the bottom plate is deformed by impact, so as to further improve the deformation resistance of the bottom plate when subjected to external impact, thereby helping to reduce the phenomenon of impact or collision of the battery cell due to deformation of the bottom plate.

[0028] In some embodiments, the buffer member covers the electrode terminal along a thickness direction of the bottom plate.

[0029] In the above technical solution, by setting the buffer member to a structure covering the electrode terminal in the thickness direction of the base plate, the projection of the electrode terminal in the thickness direction of the base plate is entirely located within the buffer member, which is beneficial to further enhance the buffering and protective effect of the buffer member on the electrode terminal.

[0030] In some embodiments, the battery also includes a busbar component; the busbar component is arranged in the box body, and along the thickness direction of the bottom plate, the busbar component is connected to one end of the electrode terminal facing the bottom plate to electrically connect the battery cells; wherein, along the thickness direction of the bottom plate, the first surface is closer to the bottom plate than the busbar component, and the buffer is arranged between the busbar component and the bottom plate.

[0031] In the above technical solution, a busbar is also provided in the battery box, and the busbar is connected to the electrode terminal to realize the input or output of the electric energy of the battery cell, wherein, by connecting the busbar to the end of the electrode terminal facing the bottom plate, and arranging the buffer between the busbar and the bottom plate, on the one hand, it is convenient to assemble and connect the busbar with the electrode terminal, which is conducive to reducing the difficulty of assembly between the busbar and the electrode terminal, and on the other hand, the buffer can also play a certain buffering and protective role on the busbar. In addition, by arranging the first surface closer to the bottom plate than the busbar, the support can also play a certain supporting and protective role on the busbar.

[0032] In some embodiments, along the thickness direction of the bottom plate, two sides of the buffer member abut against the collecting component and the bottom plate respectively.

[0033] In the above technical solution, by setting the two sides of the buffer member in the thickness direction of the bottom plate to respectively abut against the collector component and the bottom plate, the size of the gap between the buffer member and the bottom plate can be reduced. On the one hand, the internal space utilization of the battery can be improved, which is beneficial to improving the energy density of the battery. On the other hand, the buffering effect of the buffer member on the collector component and the electrode terminal can be improved, and the supporting effect of the buffer member on the bottom plate can be further improved, so as to further improve the deformation resistance of the bottom plate when subjected to external impact, which is beneficial to reduce the phenomenon of impact or collision of the battery cell due to deformation of the bottom plate.

[0034] In some embodiments, the battery cell group includes a plurality of battery cells, the plurality of battery cells are stacked along a first direction, a busbar component connects electrode terminals of the plurality of battery cells, and the first direction is perpendicular to a thickness direction of a base plate; wherein the buffer extends along the first direction, and along the thickness direction of the base plate, the buffer covers the electrode terminals of the plurality of battery cells.

[0035] In the above technical solution, the battery cell group is provided with a plurality of battery cells stacked along a first direction, and the current collecting component connects the electrode terminals of the plurality of battery cells to realize parallel or series connection between the plurality of battery cells, and the structure is simple and easy to realize. Among them, by setting the buffer member as a structure extending along the first direction, and the buffer member covers the electrode terminals of the plurality of battery cells in the thickness direction of the bottom plate, the buffer member can buffer and protect the electrode terminals of the plurality of battery cells in the battery cell group, so that there is no need to set a buffer member corresponding to the electrode terminal of each battery cell, which is conducive to reducing the manufacturing cost of the battery, and is conducive to reducing the difficulty of assembling the battery, so as to improve the assembly efficiency of the battery.

[0036] In some embodiments, a battery cell includes two electrode terminals with opposite polarities, the two electrode terminals are respectively a first electrode terminal and a second electrode terminal, the first electrode terminal and the second electrode terminal are arranged on the wall portion at intervals along a second direction, and the second direction is perpendicular to the thickness direction of the base plate and the first direction; wherein, two buffer members are correspondingly arranged in the battery cell group, the two buffer members are arranged at intervals along the second direction, and along the thickness direction of the base plate, one buffer member covers the first electrode terminals of multiple battery cells, and the other buffer member covers the second electrode terminals of multiple battery cells.

[0037] In the above technical solution, each battery cell is provided with a first electrode terminal and a second electrode terminal with opposite polarities to respectively input or output the positive and negative electrodes of the battery cell. Two buffer components are provided corresponding to each battery cell group, and one buffer component covers the first electrode terminals of multiple battery cells, and the other buffer component covers the second electrode terminals of multiple battery cells, so that the first electrode terminals and the second electrode terminals of the battery cells are buffered and protected respectively by the two buffer components. The structure is simple and easy to assemble.

[0038] In some embodiments, the buffer is connected to the busbar component.

[0039] In the above technical solution, the buffer is connected to the busbar component to improve the reliability of the buffer being set between the base plate and the busbar component. On the one hand, it is convenient to assemble the buffer between the base plate and the busbar component, and the buffer, the busbar component and the battery cell group can be assembled into a whole before being assembled into the box body, which is beneficial to reduce the difficulty of assembling the buffer and improve the assembly efficiency of the battery. On the other hand, it can reduce the phenomenon of the buffer falling off between the base plate and the busbar component, so as to improve the stability of battery use.

[0040] In some embodiments, the buffer is adhesively connected to the busbar component.

[0041] In the above technical scheme, the buffer component and the runner component are connected by an adhesive connection structure. On the one hand, it is easy to assemble and helps to reduce the difficulty of connection between the buffer component and the runner component. On the other hand, it can achieve the connection and assembly between the buffer component and the runner component without affecting the runner component, which helps to alleviate the phenomenon of the buffer component damaging the runner component.

[0042] In some embodiments, the elastic modulus of the material of the buffer is greater than or equal to 3 MPa and less than or equal to 100 MPa.

[0043] In the above technical solution, the elastic modulus of the material of the buffer is greater than or equal to 3MPa and less than or equal to 100MPa. On the one hand, by setting the elastic modulus of the material of the buffer to be greater than or equal to 3MPa, the phenomenon that the buffer is too soft and the buffer absorbs the impact force poorly can be alleviated, and the phenomenon that the buffer is not effective in allocating and dispersing the impact force can be alleviated. On the other hand, by setting the elastic modulus of the material of the buffer to be less than or equal to 100MPa, the phenomenon that the stiffness of the buffer is too large and the impact force directly transmitted to the electrode terminal can be alleviated, which is beneficial to improve the buffering and protection effect of the buffer on the electrode terminal.

[0044] In some embodiments, the buffer is made of insulating material.

[0045] In the above technical solution, by setting the buffer to be an insulating material, the electrode terminals of the battery cell will not form a circuit connection with the buffer, thereby reducing the risk of short circuit inside the battery and improving the reliability of the battery.

[0046] In some embodiments, the pressure relief mechanism is disposed on the wall portion; wherein, in a plane perpendicular to the thickness direction of the bottom plate, the orthographic projection of the pressure relief mechanism does not overlap with the orthographic projection of the buffer component.

[0047] In the above technical solution, the pressure relief mechanism and the buffer are arranged so that their orthographic projections in a plane perpendicular to the thickness direction of the base plate do not overlap, so that the buffer does not cover or block the pressure relief mechanism in the thickness direction of the base plate, thereby reducing the blocking and interference effects of the buffer on the pressure relief mechanism, thereby improving the smoothness of the pressure relief mechanism in releasing the internal pressure of the battery cell.

[0048] In some embodiments, the box body further includes a top plate; the top plate and the bottom plate are arranged opposite to each other along the thickness direction of the bottom plate and are respectively located on both sides of the battery cell; wherein, along the thickness direction of the bottom plate, the outer shell is connected to the top plate.

[0049] In the above technical solution, by connecting the outer shell of the battery cell to the top plate of the box body, so as to realize a structure in which the battery cell is suspended in the box body, on the one hand, the bearing force of the bottom plate can be reduced, which is beneficial to improving the bearing effect of the bottom plate; on the other hand, the phenomenon that the battery cell is pressed against the bottom plate by the support member can be alleviated, thereby optimizing the stress condition of the support member, and further improving the support and protection effect of the support member on the battery cell when the bottom plate is impacted.

[0050] In some embodiments, the outer shell is adhesively connected to the top plate.

[0051] In the above technical solution, an adhesive connection structure is used to connect the outer shell of the battery cell and the top plate of the box body. On the one hand, it is easy to assemble and helps to reduce the difficulty of connecting the outer shell of the battery cell and the top plate of the box body. On the other hand, it can achieve the connection and assembly between the outer shell of the battery cell and the top plate of the box body without affecting the battery cell, which helps to alleviate the phenomenon of battery cell damage.

[0052] In some embodiments, the outer shell includes a shell and an end cover; a housing cavity with an opening is formed inside the shell, the housing cavity is used to accommodate the electrode assembly, and the opening is located at one end of the shell facing the bottom plate in the thickness direction of the bottom plate; the end cover closes the opening; wherein the end cover is a wall portion.

[0053] In the above technical solution, by setting the wall portion of the shell as an end cover for closing the opening of the shell, the battery cell adopting this structure is convenient for assembling the electrode terminal or the pressure relief mechanism on the end cover, and can reduce the difficulty of electrically connecting the electrode terminal and the electrode assembly to each other, thereby helping to reduce the manufacturing difficulty of the battery cell and improve the production efficiency of the battery cell.

[0054] In some embodiments, the outer shell includes a shell and an end cover; the shell includes an integrally formed side wall and a wall portion, the side wall is arranged around the wall portion, and along the thickness direction of the bottom plate, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, and the side wall and the wall portion jointly define a accommodating cavity for accommodating the electrode assembly; the end cover closes the opening.

[0055] In the above technical solution, by setting the wall portion of the shell as the bottom 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 realize that the area of ​​the shell where the electrode terminal or the pressure relief mechanism is arranged is far away from the end cover. On the one hand, it can alleviate the phenomenon that the pulling or twisting force of other components on the electrode terminal directly acts on the end cover, so as to reduce the risk of connection failure between the end cover and the shell, which is beneficial to reducing the risk of leakage of the battery cell during use. On the other hand, it can alleviate the phenomenon that the stress generated by the connection between the end cover and the shell acts on the pressure relief mechanism, so as to reduce the phenomenon that the pressure relief mechanism is damaged or the valve is actuated in advance, which is beneficial to improve the service life and reliability of the battery cell.

[0056] In a second aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery, wherein the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] 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.

[0058] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0059] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0060] Figure 3 A schematic diagram of the structure of a battery (after removing the bottom plate) provided in some embodiments of the present application;

[0061] Figure 4 A cross-sectional view of a battery provided for some embodiments of the present application;

[0062] Figure 5 for Figure 4 A partial enlarged view of the battery at A shown;

[0063] Figure 6 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0064] Figure 7 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0065] Figure 8 A schematic diagram of the structure of a battery support provided in some embodiments of the present application;

[0066] Fig. 9 for Figure 4 A partial enlarged view of point B of the battery shown.

[0067] Icons: 1000-vehicle; 100-battery; 10-casing; 11-bottom plate; 12-top plate; 13-frame; 20-battery cell group; 21-battery cell; 211-shell; 2111-wall; 2112-shell; 2112a-opening; 2113-end cover; 212-electrode terminal; 213-pressure relief mechanism; 214-electrode assembly; 2141-ear; 215-current collecting member; 30-support; 31-first surface; 32-cavity; 33-assembly hole; 40-collecting component; 50-electrode output seat; 60-buffer; 200-controller; 300-motor; X-thickness direction of the bottom plate; Y-first direction; Z-second direction. DETAILED DESCRIPTION

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] The term "plurality" used in the present application refers to two or more (including two).

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.).

[0081] 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 0.05 O2) and its modified compounds, etc.

[0082] 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.

[0083] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0084] 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.).

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0097] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0098] 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.

[0099] 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.

[0100] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0101] 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.

[0102] In some embodiments, the electrode assembly is a laminate structure.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0117] 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.

[0118] For a general battery, the battery usually includes a box body and a plurality of battery cells contained in the box body. The battery cells include an outer shell and electrode terminals arranged on the outer shell. The electrode terminals of the plurality of battery cells are connected by a busbar component to realize the series connection or parallel connection between the plurality of battery cells in the battery. The outer shell of the battery cell is also provided with a pressure relief mechanism, which is used to release the internal pressure of the battery cell to reduce the risk of explosion of the battery cell due to thermal runaway. However, since the operating conditions of the battery are relatively complex and are often impacted by the external environment, the box body is very easy to be squeezed and deformed after being impacted by the external environment. The phenomenon of bumping or directly transmitting the impact force to the battery cell, and it is very easy to cause impact and bump on the pressure relief mechanism on the outer shell of the battery cell and the protruding electrode terminal, especially in the structure where the battery cell is placed upside down in the box, that is, the electrode terminals and the pressure relief mechanism of the battery cell are located at the bottom of the battery cell, which makes it very easy to cause damage to the electrode terminals and the pressure relief mechanism of the battery cell when the bottom of the battery is impacted or the bottom ball hitting test is carried out, resulting in the risk of damage or leakage of the battery cell, and even the risk of fire and explosion during use, which is not conducive to improving the service life and reliability of the battery.

[0119] Based on the above considerations, in order to solve the problems of short battery life and low reliability in use, an embodiment of the present application provides a battery, which includes a case, a battery cell group and a support. The case includes a bottom plate. The battery cell group is accommodated in the case, and the battery cell group includes at least one battery cell. The battery cell includes a shell, an electrode terminal and a pressure relief mechanism. The shell has a wall portion, and along the thickness direction of the bottom plate, the wall portion and the bottom plate are arranged facing each other. The electrode terminal and the pressure relief mechanism are both arranged on the shell, and at least one of the electrode terminal and the pressure relief mechanism is arranged on the wall portion. The support member is arranged between the wall portion and the bottom plate and is connected to the wall portion. Along the thickness direction of the bottom plate, the support member has a first surface facing away from the wall portion, and the first surface is closer to the bottom plate than the electrode terminal and the pressure relief mechanism.

[0120] In a battery of this structure, the box body has a bottom plate located at the bottom of the battery cell, the wall portion of the shell is arranged facing the bottom plate, and at least one of the electrode terminal and the pressure relief mechanism of the battery cell is arranged on the wall portion, so that at least one of the electrode terminal and the pressure relief mechanism is arranged on the side of the shell facing the bottom plate, and a support member is arranged between the bottom plate of the box body and the wall portion of the shell, the support member is connected to the wall portion, and the first surface of the support member facing away from the wall portion is closer to the bottom plate than the electrode terminal and the pressure relief mechanism. On the one hand, when the battery is subjected to a bottom ball hitting test or a bottom impact during use, the support member can play a certain supporting role on the bottom plate of the box body, so as to improve the deformation resistance of the bottom plate when subjected to external impact. This helps to reduce the phenomenon of impact or collision of battery cells due to deformation of the bottom plate. On the other hand, when the bottom plate of the box is impacted or deformed, the impact force on the bottom plate can be preferentially contacted with the support member, and the impact force on the bottom plate can be dispersed through the support member to increase the force-bearing area, thereby alleviating the phenomenon of the impact force on the bottom plate being concentrated on the battery cell, thereby reducing the local force concentration on the battery cell, thereby enhancing the protection of the electrode terminal or pressure relief mechanism of the battery cell, and further effectively reducing the risk of damage to the electrode terminal or pressure relief mechanism of the battery cell by impact, and can reduce the risk of leakage or fire and explosion of the battery cell, which is beneficial to improving the service life and reliability of the battery.

[0121] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery disclosed in the present application can be used to form the electrical device, which is helpful to alleviate the problem of damage to the battery cells due to impact during use, thereby improving the service life and reliability of the battery.

[0122] 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.

[0123] 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.

[0124] Please refer to Figure 1 , Figure 1 A 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.

[0125] 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.

[0126] According to some embodiments of the present application, referring to Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 2 The structure explosion diagram of the battery 100 provided in some embodiments of the present application is shown in FIG. Figure 3 This is a schematic diagram of the structure of a battery 100 (after removing the bottom plate 11) provided in some embodiments of the present application. Figure 4 A cross-sectional view of a battery 100 provided in some embodiments of the present application, Figure 5 for Figure 4 The enlarged view of the part A of the battery 100 is shown. Figure 6A schematic diagram of the structure of a battery cell 21 provided in some embodiments of the present application. The present application provides a battery 100, which includes a case 10, a battery cell group 20 and a support member 30. The case 10 includes a bottom plate 11. The battery cell group 20 is accommodated in the case 10, and the battery cell group 20 includes at least one battery cell 21, and the battery cell 21 includes a shell 211, an electrode terminal 212 and a pressure relief mechanism 213. The shell 211 has a wall portion 2111, and along the thickness direction X of the bottom plate, the wall portion 2111 is arranged facing the bottom plate 11, and the electrode terminal 212 and the pressure relief mechanism 213 are both arranged on the shell 211, and at least one of the electrode terminal 212 and the pressure relief mechanism 213 is arranged on the wall portion 2111. The support member 30 is arranged between the wall portion 2111 and the bottom plate 11 and connected to the wall portion 2111. Along the thickness direction X of the bottom plate, the support member 30 has a first surface 31 away from the wall portion 2111 , and the first surface 31 is closer to the bottom plate 11 than the electrode terminal 212 and the pressure relief mechanism 213 .

[0127] The box 10 is used to provide an assembly space for the battery cells 21, and the box 10 can adopt a variety of structures. Figure 2 In the figure, the box body 10 includes a bottom plate 11, a top plate 12 and a frame body 13. The frame body 13 is a hollow structure with both ends open in the thickness direction X of the bottom plate, that is, the frame body 13 is an annular structure surrounding the outer side of the battery cell group 20. The bottom plate 11 and the top plate 12 are relatively arranged along the thickness direction X of the bottom plate, and the bottom plate 11 and the top plate 12 are respectively connected to the two sides of the frame body 13 in the thickness direction X of the bottom plate, so that the bottom plate 11, the top plate 12 and the frame body 13 jointly define an assembly space for accommodating the battery cell 21.

[0128] Along the thickness direction X of the bottom plate, the bottom plate 11 plays a supporting role for the battery cell group 20 or other components in the battery 100. That is, the thickness direction X of the bottom plate is the gravity direction or is approximately the gravity direction, and the bottom plate 11 is located at the bottom of the battery cell 21 in the thickness direction X of the bottom plate. Correspondingly, the top plate 12 is located at the top of the battery cell 21.

[0129] Exemplarily, the bottom plate 11 , the top plate 12 and the frame 13 are separately arranged and connected to facilitate assembly of components such as the battery cells 21 in the box 10 .

[0130] Optionally, the base plate 11 can be connected to one side of the frame 13 in the thickness direction X of the base plate by bonding, welding, bolting or other structures. Similarly, the top plate 12 can also be connected to the side of the frame 13 in the thickness direction X of the base plate away from the base plate 11 by bonding, welding, bolting or other structures.

[0131] It should be noted that, in some embodiments, the structure of the box body 10 can be multiple. For example, the bottom plate 11 and the frame body 13 can be an integrally formed structure, and correspondingly, the top plate 12 and the frame body 13 can be separately arranged. Of course, the top plate 12 and the frame body 13 can also be an integrally formed structure, and correspondingly, the bottom plate 11 and the frame body 13 can be separately arranged.

[0132] Of course, the box 10 can also be in various shapes, such as a cylinder, a cuboid, or a cube. Figure 2 and Figure 3 The height direction of the box 10 is the thickness direction X of the bottom plate, the width direction of the box 10 is the first direction Y, the length direction of the box 10 is the second direction Z, and the thickness direction X of the bottom plate, the first direction Y and the second direction Z are perpendicular to each other.

[0133] Optionally, in the battery 100, the battery cell group 20 contained in the box 10 may be one or more. When there are more than one battery cell group 20 disposed in the box 10, the multiple battery cell groups 20 may be connected in series, in parallel, or in mixed connection, where mixed connection means that the multiple battery cell groups 20 are connected in both series and in parallel.

[0134] For example, in Figure 2 and Figure 3 In the embodiment, the battery 100 may include a plurality of battery cell groups 20 , and the plurality of battery cell groups 20 are arranged along the second direction Z.

[0135] Similarly, the battery cell group 20 includes at least one battery cell 21, that is, each battery cell group 20 may include one or more battery cells 21. When the battery cell group 20 includes multiple battery cells 21, the multiple battery cells 21 may be connected in series, in parallel, or in a mixed connection.

[0136] For example, in Figure 2 and Figure 3 In the embodiment, the battery 100 includes a plurality of battery cell groups 20 arranged along a second direction Z, and each battery cell group 20 includes a plurality of battery cells 21 stacked along a first direction Y, so that the plurality of battery cells 21 are assembled in an arranged structure in the box body 10. Exemplarily, the first direction Y is the thickness direction of the battery cell 21, so that the plurality of battery cells 21 in the battery cell group 20 are stacked along the thickness direction of the battery cell 21.

[0137] In some embodiments, see Figure 2 and Figure 3As shown, the battery 100 may also include a busbar component 40, which is used to electrically connect multiple battery cells 21 in the battery cell group 20 to achieve series connection or parallel connection between the multiple battery cells 21 in the battery cell group 20, and the busbar component 40 is also used to electrically connect two adjacent battery cell groups 20 to achieve series connection or parallel connection between two adjacent battery cell groups 20, wherein the busbar component 40 is connected to the electrode terminal 212 of the battery cell 21.

[0138] In some embodiments, see Figure 2 and Figure 3 As shown, the battery 100 may further include an electrode output seat 50 , which is installed in the box body 10 . The electrode output seat 50 is connected to the busbar component 40 to output or input electrical energy of the battery 100 .

[0139] Optionally, each battery cell 21 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 21 may be in a rectangular parallelepiped, a cylinder, a prism or other shapes. Figure 6 In the figure, the battery cell 21 is a rectangular parallelepiped structure. Correspondingly, the thickness direction X of the bottom plate is also the height direction of the battery cell 21, the first direction Y is also the thickness direction of the battery cell 21, and the second direction Z is also the length direction of the battery cell 21.

[0140] In the embodiment of the present application, the housing 211 can also be used to contain electrolyte, such as electrolyte. The housing 211 can be in various structural forms. The material of the housing 211 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0141] Among them, refer to Figure 6 , and please refer to Figure 7 , Figure 7 An exploded view of the structure of a battery cell 21 provided for some embodiments of the present application. The battery cell 21 also includes an electrode assembly 214, which is accommodated in the housing 211, and the electrode assembly 214 is electrically connected to the electrode terminal 212 to achieve the input or output of electrical energy of the battery cell 21. The housing 211 may include a shell 2112 and an end cover 2113, a housing cavity is formed inside the shell 2112, and an opening 2112a is formed at one end of the housing cavity, that is, the shell 2112 is a hollow structure with one end open, and the end cover 2113 covers the opening 2112a of the shell 2112 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 214 and the electrolyte.

[0142] Optionally, the wall portion 2111 on which the electrode terminal 212 or the pressure relief mechanism 213 is disposed may be an end cap 2113, or may be one of the multiple walls of the housing 2112. Figure 6 and Figure 7 As shown, the wall portion 2111 may also be the end cover 2113 of the housing 211, and correspondingly, the opening 2112a is located at one end of the housing 2112 facing the bottom plate 11 of the box body 10 in the thickness direction X of the bottom plate, so that the thickness direction X of the bottom plate is the thickness direction of the wall portion 2111, and also the thickness direction of the end cover 2113. Of course, in other embodiments, the wall portion 2111 may also be the bottom wall of the housing 2112 arranged opposite to the end cover 2113 in the thickness direction X of the bottom plate, and correspondingly, the thickness direction X of the bottom plate is the arrangement direction of the end cover 2113 and the wall portion 2111, and similarly, the wall portion 2111 may also be the side wall of the housing 2112 and the end cover 2113 adjacent to and abutting against each other.

[0143] Along the thickness direction X of the bottom plate, the wall portion 2111 is disposed facing the bottom plate 11 , that is, the wall of one end of the housing 211 of the battery cell 21 facing the bottom plate 11 in the thickness direction X of the bottom plate is the wall portion 2111 .

[0144] When assembling the battery cell 21 , the electrode assembly 214 may be placed in the housing 2112 first, and the housing 2112 may be filled with electrolyte. The end cap 2113 may then be placed on the opening 2112 a of the housing 2112 to seal the opening 2112 a of the housing 2112 .

[0145] The shell 2112 can be in various shapes, such as a cylinder, a cuboid, etc. The shape of the shell 2112 can be determined according to the specific shape of the electrode assembly 214. For example, if the electrode assembly 214 is a cylindrical structure, the shell 2112 can be a cylindrical structure; if the electrode assembly 214 is a cuboid structure, the shell 2112 can be a cuboid structure. Of course, the end cap 2113 can also be a variety of structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 6 and Figure 7 In the embodiment, the shell 2112 is a rectangular parallelepiped structure.

[0146] It is understandable that the outer shell 211 is not limited to the above structure, and the outer shell 211 may also be other structures. For example, the outer shell 211 includes a shell body 2112 and two end caps 2113. The shell body 2112 is a hollow structure with openings 2112a on opposite sides. One end cap 2113 corresponds to an opening 2112a of the shell body 2112 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 214 and the electrolyte.

[0147] The electrode assembly 214 is a component in the battery cell 21 where electrochemical reactions occur. The structure of the electrode assembly 214 can be of various types. For example, the electrode assembly 214 can be a wound structure formed by winding a positive electrode sheet, an isolation member, and a negative electrode sheet, or a stacked structure formed by stacking a positive electrode sheet, an isolation member, and a negative electrode sheet.

[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] Among them, a pole ear 2141 is formed at one end of the electrode assembly 214, and the pole ear 2141 is used to input or output the positive electrode or negative electrode of the electrode assembly 214, and the pole ear 2141 is used to connect to the electrode terminal 212 to achieve electrical connection between the electrode assembly 214 and the electrode terminal 212. It should be noted that the pole ear 2141 of the electrode assembly 214 is a component formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer, or a component formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer. If the pole ear 2141 is used to output the positive electrode of the electrode assembly 214, the pole ear 2141 is a component formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if the pole ear 2141 is used to output the negative electrode of the electrode assembly 214, the pole ear 2141 is a component formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer.

[0150] Optionally, the number of electrode assemblies 214 contained in the housing 211 may be one or more. Figure 7 In the embodiment, the outer shell 211 of the battery cell 21 is provided with two electrode assemblies 214, and the two electrode assemblies 214 are stacked along the first direction Y, that is, the two electrode assemblies 214 are stacked along the thickness direction of the battery cell 21. Of course, in other embodiments, the electrode assemblies 214 accommodated in the outer shell 211 can be one, three, four, five, six, seven or eight, etc.

[0151] In the embodiment of the present application, the electrode terminal 212 serves to output or input electrical energy of the battery cell 21 . The electrode terminal 212 is insulated and mounted on the shell 211 and protrudes from the outer surface of the shell 211 , that is, no electrical connection is formed between the electrode terminal 212 and the shell 211 .

[0152] For example, in Figure 5 and Figure 6In the embodiment, the electrode terminal 212 is insulated and mounted on the wall portion 2111 and protrudes from the side of the wall portion 2111 facing the bottom plate 11 in the thickness direction X of the bottom plate, that is, no electrical connection is formed between the electrode terminal 212 and the wall portion 2111, and the electrode terminal 212 protrudes from the surface of the side of the wall portion 2111 facing the bottom plate 11 along the thickness direction X of the bottom plate toward the bottom plate 11. Similarly, the material of the electrode terminal 212 can also be a variety of materials, for example, the material of the electrode terminal 212 can be copper, iron, aluminum, steel, aluminum alloy, etc.

[0153] Optionally, the electrode terminal 212 may be directly connected to the electrode ear 2141 of the electrode assembly 214 , for example, by welding or abutment, or may be indirectly connected to the electrode ear 2141 of the electrode assembly 214 through other components.

[0154] In some embodiments, see Figure 7 As shown, the battery cell 21 may further include a current collecting member 215 disposed in the housing 211 , and the current collecting member 215 connects the electrode terminal 212 and the tab 2141 of the electrode assembly 214 to achieve electrical connection between the electrode assembly 214 and the electrode terminal 212 .

[0155] Exemplarily, the current collecting member 215 is welded to the electrode terminal 212, and the current collecting member 215 is welded to the pole tab 2141 of the electrode assembly 214. Of course, in other embodiments, the current collecting member 215 may also be a structure that abuts against the electrode terminal 212, and similarly, the current collecting member 215 may also be a structure that abuts against the pole tab 2141 of the electrode assembly 214.

[0156] exist Figure 6 and Figure 7 In the figure, the battery cell 21 includes two electrode terminals 212 and two current collecting components 215, the two electrode terminals 212 are arranged on the wall 2111 at intervals along the second direction Z, and the two current collecting components 215 are arranged in the shell 211 at intervals along the second direction Z. Correspondingly, each electrode assembly 214 has two pole ears 2141, the two pole ears 2141 are arranged at intervals along the second direction Z, and the polarities of the two pole ears 2141 are opposite. The two electrode terminals 212 are electrically connected to the two pole ears 2141 of the electrode assembly 214 through the two current collecting components 215, respectively, so as to realize the input or output of the positive and negative electrodes of the battery cell 21, that is, the two electrode terminals 212 are respectively used to output or input the positive and negative electrodes of the battery cell 21, and correspondingly, the two pole ears 2141 are respectively the positive pole ear and the negative pole ear of the electrode assembly 214.

[0157] In the embodiment of the present application, the pressure relief mechanism 213 serves to release the pressure inside the battery cell 21 when the internal pressure or temperature of the battery cell 21 reaches a predetermined value.

[0158] At least one of the electrode terminal 212 and the pressure relief mechanism 213 is disposed on the wall portion 2111, that is, only one of the electrode terminal 212 and the pressure relief mechanism 213 may be disposed on the wall portion 2111, or both of them may be disposed on the wall portion 2111. Figure 5 and Figure 6 In the embodiment, the pressure relief mechanism 213 is also arranged on the wall portion 2111, that is, the electrode terminal 212 and the pressure relief mechanism 213 are both arranged on the wall portion 2111. Figure 7 In the embodiment, the wall portion 2111 is an end cover 2113 , and correspondingly, the electrode terminal 212 and the pressure relief mechanism 213 are both disposed on the end cover 2113 of the housing 211 .

[0159] It should be noted that, in other embodiments, only the electrode terminal 212 may be arranged on the wall portion 2111, and the pressure relief mechanism 213 may be arranged on other walls of the shell 211. Of course, only the pressure relief mechanism 213 may be arranged on the wall portion 2111, and the electrode terminal 212 may be arranged on other walls of the shell 211.

[0160] Optionally, the pressure relief mechanism 213 and the housing 211 may be an integrally formed structure or a separately set structure. If the pressure relief mechanism 213 and the housing 211 are a separate structure, the pressure relief mechanism 213 may be connected to the housing 211 by welding or the like, and correspondingly, the pressure relief mechanism 213 may be a pressure relief component 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 213 and the housing 211 are an integrally formed structure, the pressure relief mechanism 213 is an area on the housing 211 where a weak structure is formed, for example, an area on the housing 211 where a notch groove is set.

[0161] In the embodiment of the present application, the support member 30 is disposed between the bottom plate 11 of the box body 10 and the wall portion 2111 of the outer shell 211 of the battery cell 21 in the thickness direction X of the bottom plate, and the support member 30 is connected to the wall portion 2111 to play a supporting role between the bottom plate 11 of the box body 10 and the wall portion 2111 of the outer shell 211 of the battery cell 21. The material of the support member 30 can be a variety of materials, and the support member 30 can be an insulating material, such as carbon fiber, epoxy resin, polyurethane resin, plastic or ceramic, etc. Of course, the support member 30 can also be a metal material, such as copper, iron, aluminum, steel, aluminum alloy, etc. It should be noted that when the support member 30 is made of metal, an insulating film needs to be coated on the outer surface of the support member 30 to insulate and isolate the support member 30 from other components such as the battery cell 21 and the box body 10.

[0162] Optionally, the connection structure between the support member 30 and the wall portion 2111 may be various, such as bonding, bolting, or clamping.

[0163] Along the thickness direction X of the bottom plate, the support member 30 has a first surface 31 facing away from the wall portion 2111, and the first surface 31 is closer to the bottom plate 11 than the electrode terminal 212 and the pressure relief mechanism 213. That is, in the thickness direction X of the bottom plate, the first surface 31 of the support member 30 is located between the bottom plate 11 and the electrode terminal 212, and between the bottom plate 11 and the pressure relief mechanism 213, so that when the bottom plate 11 and the first surface 31 of the support member 30 are in contact or not in contact with each other, the electrode terminal 212 and the pressure relief mechanism 213 are both spaced apart from the bottom plate 11 in the thickness direction X of the bottom plate, that is, the electrode terminal 212 and the pressure relief mechanism 213 are both at a distance from the bottom plate 11 in the thickness direction X of the bottom plate.

[0164] It should be noted that, when only the electrode terminal 212 is arranged on the wall portion 2111, the first surface 31 is closer to the bottom plate 11 than the electrode terminal 212 in the thickness direction X of the bottom plate; when only the pressure relief mechanism 213 is arranged on the wall portion 2111, the first surface 31 is closer to the bottom plate 11 than the pressure relief mechanism 213 in the thickness direction X of the bottom plate; if both the electrode terminal 212 and the pressure relief mechanism 213 are arranged on the wall portion 2111, the first surface 31 is closer to the bottom plate 11 than the electrode terminal 212 and the pressure relief mechanism 213 in the thickness direction X of the bottom plate.

[0165] In the present embodiment, the box body 10 has a bottom plate 11 located at the bottom of the battery cell 21, the wall portion 2111 of the outer shell 211 is arranged facing the bottom plate 11, and at least one of the electrode terminal 212 and the pressure relief mechanism 213 of the battery cell 21 is arranged on the wall portion 2111, so that at least one of the electrode terminal 212 and the pressure relief mechanism 213 is arranged on the side of the outer shell 211 facing the bottom plate 11, and a support member 30 is arranged between the bottom plate 11 of the box body 10 and the wall portion 2111 of the outer shell 211, the support member 30 is connected to the wall portion 2111, and the first surface 31 of the support member 30 facing away from the wall portion 2111 is closer to the bottom plate 11 than the electrode terminal 212 and the pressure relief mechanism 213. The battery 100 adopting this structure can play a certain supporting role on the bottom plate 11 of the box body 10 through the support member 30 when the battery 100 is subjected to a bottom ball hitting test or a bottom impact during use, so as to prevent the battery 100 from being damaged. The deformation resistance of the bottom plate 11 when subjected to external impact is improved, which is beneficial to reduce the phenomenon of impact or collision of the battery cell 21 due to deformation of the bottom plate 11. On the other hand, when the bottom plate 11 of the box body 10 is impacted or deformed, the impact force exerted on the bottom plate 11 can be preferentially contacted with the support member 30, and the impact force exerted on the bottom plate 11 can be dispersed through the support member 30 to increase the force bearing area, so as to alleviate the phenomenon that the impact force exerted on the bottom plate 11 is concentrated on the battery cell 21, thereby reducing the local force concentration on the battery cell 21, so as to enhance the protection of the electrode terminal 212 or the pressure relief mechanism 213 of the battery cell 21, and further effectively reduce the risk of the electrode terminal 212 or the pressure relief mechanism 213 of the battery cell 21 being damaged by impact, and can reduce the risk of leakage or fire and explosion of the battery cell 21, which is beneficial to improve the service life and reliability of the battery 100.

[0166] According to some embodiments of the present application, referring to Figure 4 and Figure 5 , and please refer to Figure 8 , Figure 8 Schematic diagram of the structure of the support member 30 of the battery 100 provided in some embodiments of the present application. Along the thickness direction X of the bottom plate, the first surface 31 abuts against the bottom plate 11. In other words, the two sides of the support member 30 in the thickness direction X of the bottom plate abut against the bottom plate 11 and the wall portion 2111 respectively.

[0167] In this embodiment, by abutting the first surface 31 against the bottom plate 11, the support member 30 is configured to be a structure in which the two sides in the thickness direction X of the bottom plate are respectively abutted against the wall portion 2111 of the outer shell 211 and the bottom plate 11 of the box body 10. The battery 100 adopting this structure can reduce the size of the gap between the support member 30 and the bottom plate 11. On the one hand, it can improve the internal space utilization rate of the battery 100, which is beneficial to improving the energy density of the battery 100. On the other hand, it can improve the supporting effect of the support member 30 on the bottom plate 11, so as to further improve the deformation resistance of the bottom plate 11 when subjected to external impact, thereby helping to reduce the phenomenon of impact or collision of the battery cell 21 due to deformation of the bottom plate 11.

[0168] According to some embodiments of the present application, see Figure 2 , Figure 3 and Figure 5 As shown, the battery cell group 20 includes a plurality of battery cells 21, which are stacked along a first direction Y, and the first direction Y is perpendicular to the thickness direction X of the bottom plate. The support member 30 extends along the first direction Y, and the support member 30 is connected to the wall portions 2111 of the housings 211 of the plurality of battery cells 21 in the battery cell group 20.

[0169] The battery cell group 20 includes a plurality of battery cells 21 , and the plurality of battery cells 21 are stacked along a first direction Y. That is, each battery cell group 20 is composed of a plurality of battery cell groups 20 stacked along the first direction Y.

[0170] For example, in Figure 2 and Figure 3 In the embodiment, the battery cell group 20 includes four battery cells 21 stacked along the first direction Y. Of course, in other embodiments, the battery cell group 20 may also include two, three, five or six battery cells 21 stacked along the first direction Y.

[0171] The support member 30 is connected to the wall portion 2111 of the outer shell 211 of the multiple battery cells 21 in the battery cell group 20, that is, the support member 30 is arranged between the multiple battery cells 21 in the battery cell group 20 and the bottom plate 11, and the support member 30 is connected to the wall portion 2111 of the outer shell 211 of the multiple battery cells 21 in the battery cell group 20, so that the multiple battery cells 21 in the battery cell group 20 can share one support member 30.

[0172] In the present embodiment, the battery cell group 20 is provided with a plurality of battery cells 21 stacked along a first direction Y. By setting the support member 30 as a structure extending along the first direction Y, and the support member 30 is connected to the wall portions 2111 of the plurality of battery cells 21 of the battery cell group 20, the support member 30 can support and protect the plurality of battery cells 21 in the battery cell group 20, thereby improving the capacity of the battery 100 while supporting and protecting the plurality of battery cells 21 of the battery cell group 20 by one support member 30, without providing a support member 30 for each battery cell 21, thereby effectively reducing the manufacturing cost of the battery 100, and helping to reduce the difficulty of assembling the battery 100, so as to improve the assembly efficiency of the battery 100.

[0173] In some embodiments, see Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the battery 100 includes a plurality of battery cell groups 20, and the plurality of battery cell groups 20 are arranged along a second direction Z, and the second direction Z is perpendicular to the thickness direction X of the bottom plate and the first direction Y. Along the second direction Z, every two adjacent battery cell groups 20 share a support member 30, and the support member 30 is connected to the wall portions 2111 of the outer shells 211 of the battery cells 21 of the two adjacent battery cell groups 20.

[0174] The battery 100 includes a plurality of battery cell groups 20 , and the plurality of battery cell groups 20 are arranged along the second direction Z. That is, the battery 100 is provided with a plurality of battery cells 21 arranged in an array.

[0175] For example, in Figure 2 and Figure 3 In the embodiment, the battery 100 includes six battery cell groups 20 arranged along the second direction Z. Of course, in other embodiments, the battery 100 may also include two, three, four, five or seven battery cell groups 20 arranged along the second direction Z.

[0176] Along the second direction Z, each two adjacent battery cell groups 20 share a support member 30, and the support member 30 is connected to the wall portion 2111 of the housing 211 of the battery cells 21 of the two adjacent battery cell groups 20. Figure 5In the embodiment, the support member 30 arranged between two adjacent battery cell groups 20 can support and protect the multiple battery cells 21 in the two adjacent battery cell groups 20, and the support member 30 is connected to the wall portion 2111 of the outer shell 211 of the battery cell 21 of the two adjacent battery cell groups 20, that is, a part of the support member 30 located between the two adjacent battery cell groups 20 is used to support the multiple battery cells 21 in one battery cell group 20, and the other part is used to support the multiple battery cells 21 in the other battery cell group 20.

[0177] In the present embodiment, by sharing one support member 30 between every two adjacent battery cell groups 20 in the second direction Z, and the support member 30 is connected to the wall portions 2111 of the multiple battery cells 21 in the two adjacent battery cell groups 20, the battery 100 adopting this structure can, on the one hand, support and protect the multiple battery cells 21 of the two adjacent battery cell groups 20 by one support member 30, which is beneficial to reducing the manufacturing cost of the battery 100, and on the other hand, the support member 30 can distribute the impact force on the bottom plate 11 to the multiple battery cells 21 of the two adjacent battery cell groups 20, thereby further alleviating the phenomenon that the impact force on the bottom plate 11 is concentrated on the battery cell 21, so as to further reduce the local force concentration of the battery cell 21, and further enhance the protection of the electrode terminal 212 or the pressure relief mechanism 213 of the battery cell 21, so as to reduce the risk of the electrode terminal 212 or the pressure relief mechanism 213 of the battery cell 21 being damaged by the impact.

[0178] According to some embodiments of the present application, see Figure 2 , Figure 5 and Figure 8 As shown, a cavity 32 is formed inside the support member 30. In other words, the support member 30 is a hollow structure.

[0179] It should be noted that, in other embodiments, reinforcing ribs may be further provided in the cavity 32 of the support member 30 , and the reinforcing ribs are connected to the wall surface of the cavity 32 to enhance the structural strength of the support member 30 .

[0180] In this embodiment, by setting a cavity 32 inside the support member 30, on the one hand, the weight of the support member 30 can be reduced, which is beneficial to improving the energy density of the battery 100; on the other hand, the support member 30 has the ability to collapse and absorb energy when subjected to a large impact force, which is beneficial to improving the protection effect of the support member 30 on the battery cell 21.

[0181] In some embodiments, see Figure 2 and Figure 8As shown, a cavity 32 is formed inside the support member 30, and the cavity 32 passes through both ends of the support member 30 along the first direction Y. In other words, the cavity 32 is a structure extending along the first direction Y, and the cavity 32 passes through the end surfaces of both ends of the support member 30 in the first direction Y.

[0182] Alternatively, see Figure 2 and Figure 8 As shown, the support member 30 is also provided with an assembly hole 33, which passes through the support member 30 along the thickness direction X of the bottom plate, and is connected to the cavity 32. The assembly hole 33 is used for inserting bolts so that the support member 30 can also be screwed to the box body 10 by bolts.

[0183] Exemplarily, two assembly holes 33 are provided on the support member 30 , and the two assembly holes 33 are respectively located at two ends of the support member 30 in the first direction Y, and the support member 30 is screwed to the frame 13 of the box body 10 by bolts.

[0184] In this embodiment, a cavity 32 is provided inside the support member 30, and the cavity 32 is provided as a structure that passes through both ends of the support member 30 along the first direction Y, thereby reducing the weight of the support member 30 and enabling the support member 30 to have the ability to collapse and absorb energy when subjected to a large impact force. At the same time, the molding difficulty of the cavity 32 of the support member 30 can be reduced, which is beneficial to reducing the manufacturing difficulty of the support member 30.

[0185] According to some embodiments of the present application, the support member 30 is adhesively connected to the wall portion 2111 .

[0186] Exemplarily, the support member 30 may be bonded to the wall portion 2111 by glue, double-sided tape or hot melt adhesive.

[0187] In this embodiment, the support member 30 and the wall portion 2111 of the outer shell 211 are connected by an adhesive connection structure. On the one hand, it is easy to assemble and helps to reduce the difficulty of connecting the support member 30 and the wall portion 2111 of the outer shell 211. On the other hand, it can achieve the connection and assembly between the support member 30 and the wall portion 2111 of the outer shell 211 without affecting the battery cell 21, which helps to alleviate the phenomenon that the support member 30 damages the battery cell 21.

[0188] According to some embodiments of the present application, the elastic modulus of the material of the support member 30 is greater than or equal to 1000 MPa.

[0189] Exemplarily, the elastic modulus of the material of the support member 30 may be 1000 MPa, 1010 MPa, 1050 MPa, 1100 MPa, 1200 MPa, 1300 MPa, 1500 MPa, 1600 MPa, 1800 MPa, 2000 MPa, 2100 MPa, 2200 MPa, 2500 MPa or 3000 MPa, etc.

[0190] Exemplarily, the material of the support member 30 may be carbon fiber, epoxy resin, polyurethane resin, or the like.

[0191] In this embodiment, by setting the elastic modulus of the material of the support member 30 to be greater than or equal to 1000 MPa, the support member 30 has sufficient rigidity, so that the supporting effect of the support member 30 between the base plate 11 and the battery cell 21 can be improved when the base plate 11 is deformed by impact, and the support member 30 has sufficient anti-deformation ability, so that the support member 30 can better distribute and disperse the impact force.

[0192] According to some embodiments of the present application, the support member 30 is made of insulating material.

[0193] It should be noted that in other embodiments, the support member 30 may also be made of metal, such as copper, iron, aluminum or aluminum alloy. When the support member 30 is made of metal, an insulating film needs to be coated on the outer surface of the support member 30 to insulate and isolate the support member 30 from the outer shell 211 of the battery cell 21.

[0194] In this embodiment, by setting the support member 30 to be an insulating material, the battery cell 21 will not form a circuit connection with the support member 30, thereby reducing the risk of short circuit inside the battery 100 and improving the reliability of the battery 100.

[0195] According to some embodiments of the present application, see Figure 3 , Figure 5 and Figure 6 As shown, the pressure relief mechanism 213 is disposed on the wall portion 2111 , and in a plane perpendicular to the thickness direction X of the bottom plate, the orthographic projection of the pressure relief mechanism 213 does not overlap with the orthographic projection of the support member 30 .

[0196] The pressure relief mechanism 213 is arranged on the wall portion 2111 , that is, the pressure relief mechanism 213 is arranged on one end of the outer shell 211 of the battery cell 21 facing the bottom plate 11 in the thickness direction X of the bottom plate. In other words, the pressure relief mechanism 213 is arranged facing the bottom plate 11 in the thickness direction X of the bottom plate.

[0197] In a plane perpendicular to the thickness direction X of the base plate, the orthographic projection of the pressure relief mechanism 213 does not overlap with the orthographic projection of the support member 30, that is, in the thickness direction X of the base plate, the projection of the pressure relief mechanism 213 does not overlap with the projection of the support member 30, and the pressure relief mechanism 213 and the support member 30 do not cover each other.

[0198] In this embodiment, the pressure relief mechanism 213 and the support member 30 are arranged so that their orthographic projections in a plane perpendicular to the thickness direction X of the base plate do not overlap, so that the support member 30 does not cover or block the pressure relief mechanism 213 in the thickness direction X of the base plate, thereby reducing the blocking and interference effects of the support member 30 on the pressure relief mechanism 213, thereby improving the smoothness of the pressure relief mechanism 213 in releasing the internal pressure of the battery cell 21.

[0199] According to some embodiments of the present application, see Figure 5 and Figure 6 As shown, the electrode terminal 212 and the pressure relief mechanism 213 are both arranged on the wall portion 2111. That is, the electrode terminal 212 and the pressure relief mechanism 213 are both arranged on one end of the housing 211 of the battery cell 21 facing the bottom plate 11 in the thickness direction X of the bottom plate, that is, the electrode terminal 212 and the pressure relief mechanism 213 are both arranged facing the bottom plate 11 in the thickness direction X of the bottom plate.

[0200] In this embodiment, the electrode terminal 212 and the pressure relief mechanism 213 are both arranged on the wall portion 2111, so that the electrode terminal 212 and the pressure relief mechanism 213 are both located at one end of the outer shell 211 of the battery cell 21 facing the bottom plate 11 in the thickness direction X of the bottom plate, thereby facilitating assembly and manufacturing, and the support member 30 can simultaneously support and protect the electrode terminal 212 and the pressure relief mechanism 213.

[0201] According to some embodiments of the present application, referring to Figure 2 , Figure 3 and Figure 6 , and please refer to Fig. 9 , Fig. 9 for Figure 4 The battery 100 is shown in a partially enlarged view of the B portion. The electrode terminal 212 is disposed on the wall portion 2111 , and the battery 100 may further include a buffer 60 , which is disposed between the electrode terminal 212 and the bottom plate 11 along the thickness direction X of the bottom plate, and at least a portion of the projection of the electrode terminal 212 is located in the buffer 60 .

[0202] The buffer member 60 is disposed between the electrode terminal 212 and the bottom plate 11 along the thickness direction X of the bottom plate, that is, the buffer member 60 is disposed on a side of the electrode terminal 212 facing the bottom plate 11 in the thickness direction X of the bottom plate.

[0203] At least a portion of the projection of the electrode terminal 212 is located within the buffer member 60 , that is, the buffer member 60 covers at least a portion of the electrode terminal 212 in the thickness direction X of the bottom plate.

[0204] In the present embodiment, the battery 100 is further provided with a buffer member 60. By arranging the buffer member 60 between the electrode terminal 212 and the bottom plate 11 in the thickness direction X of the bottom plate, and the buffer member 60 covering at least a portion of the electrode terminal 212 in the thickness direction X of the bottom plate, on the one hand, the buffer member 60 can absorb the impact force transmitted by the bottom plate 11 when the bottom plate 11 is deformed by impact, so as to reduce the impact force acting on the electrode terminal 212, thereby being able to buffer and protect the electrode terminal 212, so as to further reduce the risk of the battery cell 21 being damaged by impact, which is beneficial to improving the service life and reliability of the battery 100. On the other hand, the buffer member 60 can further increase the supporting effect on the bottom plate 11 when the bottom plate 11 is deformed by impact, so as to further improve the deformation resistance of the bottom plate 11 when subjected to external impact, thereby being beneficial to reducing the phenomenon of impact or collision of the battery cell 21 due to deformation of the bottom plate 11.

[0205] In some embodiments, see Figure 3 and Fig. 9 As shown, along the thickness direction X of the bottom plate, the buffer member 60 covers the electrode terminal 212 . That is, the projection of the electrode terminal 212 along the thickness direction X of the bottom plate is entirely located within the buffer member 60 .

[0206] In this embodiment, the buffer member 60 is configured to cover the electrode terminal 212 in the thickness direction X of the base plate, so that the projection of the electrode terminal 212 in the thickness direction X of the base plate is entirely located within the buffer member 60, thereby facilitating further enhancing the buffering and protective effect of the buffer member 60 on the electrode terminal 212.

[0207] According to some embodiments of the present application, see Figure 2 and Fig. 9 As shown, the battery 100 may further include a busbar component 40, which is disposed in the box body 10, and along the thickness direction X of the bottom plate, the busbar component 40 is connected to one end of the electrode terminal 212 facing the bottom plate 11 to electrically connect the battery cell 21. Along the thickness direction X of the bottom plate, the first surface 31 is closer to the bottom plate 11 than the busbar component 40, and the buffer 60 is disposed between the busbar component 40 and the bottom plate 11.

[0208] The busbar component 40 serves to connect the electrode terminals 212 of the plurality of battery cells 21 in the battery cell group 20 to realize the series connection or parallel connection between the plurality of battery cells 21. Figure 2In the embodiment, two electrode terminals 212 with opposite polarities in every two battery cells 21 are connected through a busbar 40 to realize the series connection between multiple battery cells 21. Correspondingly, an electrode output seat 50 for connecting to the busbar 40 is also provided in the box 10 of the battery 100 to output or input the electric energy of the battery 100 through the electrode output seat 50.

[0209] Optionally, the material of the busbar component 40 can be various, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0210] Along the thickness direction X of the base plate, the busbar component 40 is connected to the end of the electrode terminal 212 facing the base plate 11, that is, the busbar component 40 is located between the electrode terminal 212 and the base plate 11 in the thickness direction X of the base plate, and the busbar component 40 is connected to the electrode terminal 212. Exemplarily, the busbar component 40 is welded to the electrode terminal 212.

[0211] Along the thickness direction X of the base plate, the first surface 31 is closer to the base plate 11 than the convergence component 40, that is, in the thickness direction X of the base plate, the first surface 31 of the support member 30 is located between the base plate 11 and the convergence component 40, so that when the base plate 11 and the first surface 31 of the support member 30 are in contact or not in contact with each other, the convergence component 40 and the base plate 11 are both spaced-apart structures, that is, there is a distance between the convergence component 40 and the base plate 11 in the thickness direction X of the base plate.

[0212] The buffer member 60 is disposed between the busbar member 40 and the bottom plate 11 along the thickness direction X of the bottom plate. That is, the buffer member 60 is disposed on a side of the busbar member 40 away from the electrode terminal 212 in the thickness direction X of the bottom plate.

[0213] It should be noted that, in other embodiments, the busbar component 40 may also be connected to the outer peripheral surface of the electrode terminal 212, so that the busbar component 40 is not located between the electrode terminal 212 and the base plate 11. In this embodiment, the buffer component 60 is a structure directly arranged between the electrode terminal 212 and the base plate 11, or the buffer component 60 is directly connected to the end of the electrode terminal 212 facing the base plate 11.

[0214] In this embodiment, a busbar component 40 is further provided in the box body 10 of the battery 100. The busbar component 40 is connected to the electrode terminal 212 to realize the input or output of the electric energy of the battery cell 21. The busbar component 40 is connected to the end of the electrode terminal 212 facing the bottom plate 11, and the buffer 60 is provided between the busbar component 40 and the bottom plate 11. On the one hand, it is convenient to assemble and connect the busbar component 40 with the electrode terminal 212, which is conducive to reducing the difficulty of assembling between the busbar component 40 and the electrode terminal 212. On the other hand, the buffer 60 can also play a certain buffering and protective role on the busbar component 40. In addition, by setting the first surface 31 to be closer to the bottom plate 11 than the busbar component 40, the support member 30 can also play a certain supporting and protective role on the busbar component 40.

[0215] In some embodiments, see Fig. 9 As shown, along the thickness direction X of the bottom plate, two sides of the buffer member 60 abut against the flow collecting component 40 and the bottom plate 11 respectively.

[0216] In this embodiment, by setting the two sides of the buffer 60 in the thickness direction X of the bottom plate to abut against the collector part 40 and the bottom plate 11 respectively, the size of the gap between the buffer 60 and the bottom plate 11 can be reduced. On the one hand, the internal space utilization rate of the battery 100 can be improved, which is beneficial to improving the energy density of the battery 100. On the other hand, the buffering effect of the buffer 60 on the collector part 40 and the electrode terminal 212 can be improved, and the supporting effect of the buffer 60 on the bottom plate 11 can be further improved, so as to further improve the deformation resistance of the bottom plate 11 when subjected to external impact, which is beneficial to reduce the phenomenon of impact or collision of the battery cell 21 due to deformation of the bottom plate 11.

[0217] According to some embodiments of the present application, see Figure 2 , Figure 3 and Figure 4 As shown, the battery cell group 20 includes a plurality of battery cells 21, and the plurality of battery cells 21 are stacked along a first direction Y. The busbar component 40 connects the electrode terminals 212 of the plurality of battery cells 21, and the first direction Y is perpendicular to the thickness direction X of the bottom plate. The buffer 60 extends along the first direction Y, and along the thickness direction X of the bottom plate, the buffer 60 covers the electrode terminals 212 of the plurality of battery cells 21.

[0218] Among them, along the thickness direction X of the bottom plate, the buffer member 60 covers the electrode terminals 212 of multiple battery cells 21, that is, the buffer member 60 is arranged between the electrode terminals 212 of multiple battery cells 21 in the battery cell group 20 and the bottom plate 11, and the buffer member 60 can cover the electrode terminals 212 of multiple battery cells 21 in the thickness direction X of the bottom plate, so that multiple battery cells 21 of the battery cell group 20 can share one buffer member 60.

[0219] In this embodiment, the battery cell group 20 is provided with a plurality of battery cells 21 stacked along the first direction Y, and the busbar component 40 connects the electrode terminals 212 of the plurality of battery cells 21 to achieve parallel or series connection between the plurality of battery cells 21, and the structure is simple and easy to implement. Among them, by setting the buffer 60 as a structure extending along the first direction Y, and the buffer 60 covers the electrode terminals 212 of the plurality of battery cells 21 in the thickness direction X of the bottom plate, the buffer 60 can buffer and protect the electrode terminals 212 of the plurality of battery cells 21 in the battery cell group 20, so that there is no need to set a buffer 60 corresponding to the electrode terminal 212 of each battery cell 21, which is conducive to reducing the manufacturing cost of the battery 100, and is conducive to reducing the difficulty of assembling the battery 100, so as to improve the assembly efficiency of the battery 100.

[0220] In some embodiments, see Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the battery cell 21 includes two electrode terminals 212 with opposite polarities, the two electrode terminals 212 are respectively a first electrode terminal 212 and a second electrode terminal 212, the first electrode terminal 212 and the second electrode terminal 212 are arranged on the wall portion 2111 at intervals along the second direction Z, and the second direction Z is perpendicular to the thickness direction X of the bottom plate and the first direction Y. The battery cell group 20 is correspondingly provided with two buffers 60, the two buffers 60 are arranged at intervals along the second direction Z, and along the thickness direction X of the bottom plate, one buffer 60 covers the first electrode terminals 212 of multiple battery cells 21, and the other buffer 60 covers the second electrode terminals 212 of multiple battery cells 21.

[0221] The battery cell group 20 is provided with two buffer members 60 , which are arranged at intervals along the second direction Z. That is, two buffer members 60 are provided between each battery cell group 20 and the bottom plate 11 , and the two buffer members 60 are arranged at intervals along the second direction Z.

[0222] Along the thickness direction X of the bottom plate, one buffer 60 covers the first electrode terminals 212 of multiple battery cells 21, and another buffer 60 covers the second electrode terminals 212 of multiple battery cells 21. That is to say, the multiple electrode terminals 212 with the same polarity in the multiple battery cells 21 of the battery cell group 20 share one buffer 60, that is, the multiple electrode terminals 212 with the same polarity in the multiple battery cells 21 of the battery cell group 20 are covered by one buffer 60 in the thickness direction X of the bottom plate.

[0223] It should be noted that, in other embodiments, each battery cell group 20 may also be provided with only one buffer 60 , and one buffer 60 covers the first electrode terminals 212 and the second electrode terminals 212 of the plurality of battery cells 21 of the battery cell group 20 in the thickness direction X of the bottom plate.

[0224] In the present embodiment, each battery cell 21 is provided with a first electrode terminal 212 and a second electrode terminal 212 with opposite polarities to respectively input or output the positive and negative electrodes of the battery cell 21. Two buffer components 60 are provided corresponding to each battery cell group 20, and one buffer component 60 covers the first electrode terminals 212 of multiple battery cells 21, and the other buffer component 60 covers the second electrode terminals 212 of multiple battery cells 21, so that the first electrode terminals 212 and the second electrode terminals 212 of the battery cells 21 are buffered and protected respectively by the two buffer components 60. The structure is simple and easy to assemble.

[0225] According to some embodiments of the present application, see Fig. 9 As shown, the buffer member 60 is connected to the busbar component 40 .

[0226] Optionally, the connection structure between the buffer member 60 and the flow collecting component 40 may be various, such as bonding, bolting, or clamping.

[0227] It should be noted that, in other embodiments, the buffer member 60 may be a structure connected to the base plate 11, or a structure connected to both the base plate 11 and the runner component 40. Of course, the buffer member 60 may also be a structure that is only located between the base plate 11 and the runner component 40, and is not connected to either the runner component 40 or the base plate 11.

[0228] In this embodiment, the buffer 60 is connected to the convergence component 40 to improve the reliability of the buffer 60 set between the bottom plate 11 and the convergence component 40. On the one hand, it is convenient to assemble the buffer 60 between the bottom plate 11 and the convergence component 40, and the buffer 60, the convergence component 40 and the battery cell group 20 can be assembled into a whole before being assembled into the box body 10, which is beneficial to reduce the difficulty of assembling the buffer 60 and improve the assembly efficiency of the battery 100. On the other hand, it can reduce the phenomenon of the buffer 60 falling off from between the bottom plate 11 and the convergence component 40, so as to improve the stability of the battery 100.

[0229] In some embodiments, the buffer member 60 is bonded to the busbar component 40 .

[0230] Exemplarily, the buffer member 60 may be bonded to the busbar component 40 by glue, double-sided tape or hot melt adhesive.

[0231] In this embodiment, the buffer 60 and the convergence component 40 are connected by an adhesive connection structure. On the one hand, it is easy to assemble and helps to reduce the difficulty of connecting between the buffer 60 and the convergence component 40. On the other hand, it can achieve the connection and assembly between the buffer 60 and the convergence component 40 without affecting the convergence component 40, which helps to alleviate the phenomenon that the buffer 60 damages the convergence component 40.

[0232] According to some embodiments of the present application, the elastic modulus of the material of the buffer 60 is greater than or equal to 3 MPa and less than or equal to 100 MPa.

[0233] Exemplarily, the elastic modulus of the material of the buffer 60 can be 3MPa, 5MPa, 8MPa, 10MPa, 12MPa, 15MPa, 18MPa, 20MPa, 25MPa, 30MPa, 35MPa, 40MPa, 45MPa, 50MPa, 55MPa, 60MPa, 65MPa, 70MPa, 75MPa, 80MPa, 85MPa, 90MPa, 95MPa or 100MPa, etc.

[0234] Exemplarily, the material of the buffer 60 may be rubber, silicone or plastic.

[0235] In the present embodiment, the elastic modulus of the material of the buffer 60 is greater than or equal to 3 MPa and less than or equal to 100 MPa. On the one hand, by setting the elastic modulus of the material of the buffer 60 to be greater than or equal to 3 MPa, the phenomenon that the buffer 60 is too soft and the buffer 60 does not absorb the impact force well can be alleviated, and the phenomenon that the buffer 60 does not distribute and disperse the impact force well can be alleviated. On the other hand, by setting the elastic modulus of the material of the buffer 60 to be less than or equal to 100 MPa, the phenomenon that the buffer 60 is too stiff and the impact force directly transmitted to the electrode terminal 212 can be alleviated, which is beneficial to improve the buffering and protection effect of the buffer 60 on the electrode terminal 212.

[0236] According to some embodiments of the present application, the buffer 60 is made of insulating material.

[0237] In this embodiment, the buffer 60 is made of insulating material so that the electrode terminal 212 of the battery cell 21 will not form a circuit connection with the buffer 60, thereby reducing the risk of short circuit inside the battery 100 and improving the reliability of the battery 100.

[0238] According to some embodiments of the present application, see Figure 3 and Figure 5 As shown, the pressure relief mechanism 213 is disposed on the wall portion 2111 , and in a plane perpendicular to the thickness direction X of the bottom plate, the orthographic projection of the pressure relief mechanism 213 does not overlap with the orthographic projection of the buffer member 60 .

[0239] Among them, in the plane perpendicular to the thickness direction X of the base plate, the orthographic projection of the pressure relief mechanism 213 does not overlap with the orthographic projection of the buffer 60, and in the thickness direction X of the base plate, the projection of the pressure relief mechanism 213 does not overlap with the projection of the buffer 60, and the pressure relief mechanism 213 and the buffer 60 do not cover each other.

[0240] In this embodiment, the pressure relief mechanism 213 and the buffer member 60 are arranged so that their orthographic projections in a plane perpendicular to the thickness direction X of the base plate do not overlap, so that the buffer member 60 does not cover or block the pressure relief mechanism 213 in the thickness direction X of the base plate, thereby reducing the blocking and interference effects of the buffer member 60 on the pressure relief mechanism 213, thereby improving the smoothness of the pressure relief mechanism 213 in releasing the internal pressure of the battery cell 21.

[0241] According to some embodiments of the present application, see Figure 2 , Figure 4 and Figure 5 As shown, the box 10 may further include a top plate 12, which is disposed opposite to the bottom plate 11 along the thickness direction X of the bottom plate and is respectively located on both sides of the battery cell 21. The housing 211 is connected to the top plate 12 along the thickness direction X of the bottom plate.

[0242] The top of the box body 10 is a wall of the box body 10 located above the battery cell 21 in the thickness direction X of the bottom plate, so that the top plate 12 and the bottom plate 11 are respectively located on both sides of the battery cell 21 in the thickness direction X of the bottom plate.

[0243] The housing 211 is connected to the top plate 12 , that is, the battery cell 21 is suspended in the box body 10 , so that the gravity of the battery cell 21 acts on the top plate 12 .

[0244] Optionally, the connection structure between the outer shell 211 of the battery cell 21 and the top plate 12 of the box body 10 can be various, such as welding, bonding or bolting.

[0245] For example, in Figure 5 In the figure, the bottom wall of the shell 2112 of the outer shell 211 opposite to the wall portion 2111 in the thickness direction X of the bottom plate is connected to the top plate 12, that is, the end of the outer shell 211 away from the bottom plate 11 in the thickness direction X of the bottom plate is connected to the top plate 12.

[0246] In this embodiment, the outer shell 211 of the battery cell 21 is connected to the top plate 12 of the box body 10 to realize a structure in which the battery cell 21 is suspended in the box body 10. On the one hand, the bearing force on the bottom plate 11 can be reduced, which is beneficial to improving the bearing effect of the bottom plate 11. On the other hand, the phenomenon that the battery cell 21 is pressed against the bottom plate 11 by the support member 30 can be alleviated, thereby optimizing the stress condition of the support member 30, and further improving the support and protection effect of the support member 30 on the battery cell 21 when the bottom plate 11 is impacted.

[0247] In some embodiments, the housing 211 is adhesively connected to the top plate 12 .

[0248] Exemplarily, the housing 211 may be bonded to the top plate 12 by glue, double-sided tape or hot melt adhesive.

[0249] In this embodiment, an adhesive connection structure is used to connect the outer shell 211 of the battery cell 21 and the top plate 12 of the box body 10. On the one hand, it is easy to assemble and helps to reduce the difficulty of connecting the outer shell 211 of the battery cell 21 and the top plate 12 of the box body 10. On the other hand, it can achieve the connection and assembly between the outer shell 211 of the battery cell 21 and the top plate 12 of the box body 10 without affecting the battery cell 21, which helps to alleviate the phenomenon of damage to the battery cell 21.

[0250] According to some embodiments of the present application, see Figure 5 , Figure 6 and Figure 7 As shown, the housing 211 may include a housing 2112 and an end cap 2113. The housing 2112 has an accommodating cavity with an opening 2112a formed inside, and the accommodating cavity is used to accommodate the electrode assembly 214. The opening 2112a is located at one end of the housing 2112 facing the bottom plate 11 in the thickness direction X of the bottom plate. The end cap 2113 closes the opening 2112a, and the end cap 2113 is a wall portion 2111.

[0251] The end cover 2113 is a wall portion 2111 , that is, at least one of the electrode terminal 212 or the pressure relief mechanism 213 is assembled on the end cover 2113 , and the end cover 2113 is disposed facing the bottom plate 11 in the thickness direction X of the bottom plate.

[0252] In this embodiment, by setting the wall portion 2111 of the outer shell 211 as the end cover 2113 of the outer shell 211 for closing the opening 2112a, the battery cell 21 adopting this structure is convenient for assembling the electrode terminal 212 or the pressure relief mechanism 213 on the end cover 2113, and can reduce the difficulty of electrically connecting the electrode terminal 212 and the electrode assembly 214 to each other, thereby helping to reduce the manufacturing difficulty of the battery cell 21 and improve the production efficiency of the battery cell 21.

[0253] It should be noted that the structure of the battery cell 21 is not limited thereto. In other embodiments, the battery cell 21 may also be other structures. For example, the housing 211 may include a shell 2112 and an end cap 2113. The shell 2112 includes an integrally formed side wall and a wall portion 2111. The side wall is arranged around the wall portion 2111. Along the thickness direction X of the bottom plate, one end of the side wall is connected to the wall portion 2111, and the other end is enclosed to form an opening 2112a. The side wall and the wall portion 2111 jointly define a receiving cavity for accommodating the electrode assembly 214, and the end cap 2113 closes the opening 2112a. In other words, at least one of the electrode terminal 212 or the pressure relief mechanism 213 is assembled on the bottom wall of the shell 2112 that is arranged opposite to the end cap 2113 in the thickness direction X of the bottom plate, and the bottom wall of the shell 2112 is arranged facing the bottom plate 11 in the thickness direction X of the bottom plate.

[0254] In the present embodiment, by setting the wall portion 2111 of the outer shell 211 as the bottom wall of the shell 2112 which is arranged opposite to the end cover 2113 in the thickness direction of the wall portion 2111, the battery cell 21 adopting such a structure can realize that the area of ​​the outer shell 211 where the electrode terminal 212 or the pressure relief mechanism 213 is arranged is far away from the end cover 2113. On the one hand, it can alleviate the phenomenon that the force of pulling or twisting the electrode terminal 212 by other components directly acts on the end cover 2113, so as to reduce the risk of connection failure between the end cover 2113 and the shell 2112, which is beneficial to reducing the risk of leakage of the battery cell 21 during use. On the other hand, it can alleviate the phenomenon that the stress generated by the connection between the end cover 2113 and the shell 2112 acts on the pressure relief mechanism 213, so as to reduce the phenomenon that the pressure relief mechanism 213 is damaged or the valve is actuated in advance, which is beneficial to improving the service life and reliability of the battery cell 21.

[0255] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery 100 of any of the above solutions, and the battery 100 is used to provide electrical energy to the electrical device.

[0256] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0257] According to some embodiments of the present application, see Figures 2 to 9As shown, the present application provides a battery 100, which includes a box 10, a battery cell group 20, a support member 30, a current collecting member 40 and a buffer member 60. The box 10 includes a bottom plate 11, a top plate 12 and a frame 13. The frame 13 is a hollow structure with both ends open in the thickness direction X of the bottom plate. The bottom plate 11 and the top plate 12 are arranged opposite to each other in the thickness direction X of the bottom plate, and the bottom plate 11 and the top plate 12 are respectively connected to the two sides of the frame 13 in the thickness direction X of the bottom plate, so that the bottom plate 11, the top plate 12 and the frame 13 jointly define an assembly space for accommodating the battery cell group 20. There are multiple battery cell groups 20, and the multiple battery cell groups 20 are all accommodated in the box 10. The multiple battery cell groups 20 are arranged along the second direction Z. Each battery cell group 20 includes multiple battery cells 21 stacked along the first direction Y. The thickness direction X of the bottom plate, the first direction Y and the second direction Z are perpendicular to each other. The battery cell 21 includes a shell 211, an electrode terminal 212, a pressure relief mechanism 213 and an electrode assembly 214. The shell 211 has a wall portion 2111. The shell 211 includes a shell 2112 and an end cover 2113. The shell 2112 has an accommodation cavity with an opening 2112a formed inside. The accommodation cavity is used to accommodate the electrode assembly 214. The opening 2112a is located at one end of the shell 2112 facing the bottom plate 11 in the thickness direction X of the bottom plate. The end cover 2113 closes the opening 2112a. The end cover 2113 is a wall portion 2111. Along the thickness direction X of the bottom plate, the wall portion 2111 is arranged facing the bottom plate 11, and the end of the shell 211 away from the bottom plate 11 is bonded to the top plate 12. The electrode terminal 212 and the pressure relief mechanism 213 are both arranged on the wall portion 2111. The electrode terminal 212 is electrically connected to the electrode assembly 214. The pressure relief mechanism 213 is configured to release the internal pressure of the battery cell 21. The battery cell 21 includes two electrode terminals 212 with opposite polarities, the two electrode terminals 212 are respectively a first electrode terminal 212 and a second electrode terminal 212, and the first electrode terminal 212 and the second electrode terminal 212 are arranged on the wall portion 2111 at intervals along the second direction Z. The busbar component 40 connects the electrode terminals 212 of the plurality of battery cells 21 to electrically connect the plurality of battery cells 21, and along the thickness direction X of the bottom plate, the busbar component 40 is connected to one end of the electrode terminal 212 facing the bottom plate 11. The support member 30 is arranged between the wall portion 2111 and the bottom plate 11 and is bonded to the wall portion 2111, and along the thickness direction X of the bottom plate, the support member 30 has a first surface 31 facing away from the wall portion 2111, the first surface 31 abuts against the bottom plate 11, and the first surface 31 is closer to the bottom plate 11 than the electrode terminal 212, the pressure relief mechanism 213 and the busbar component 40. The support member 30 extends along the first direction Y, and the support member 30 is connected to the wall portions 2111 of the housings 211 of the plurality of battery cells 21 in the battery cell group 20 .Along the second direction Z, each two adjacent battery cell groups 20 share a support member 30, and the support member 30 is connected to the wall 2111 of the outer shell 211 of the battery cell 21 of the two adjacent battery cell groups 20. In the plane perpendicular to the thickness direction X of the bottom plate, the orthographic projection of the pressure relief mechanism 213 does not overlap with the orthographic projection of the support member 30. A cavity 32 is formed inside the support member 30, and the cavity 32 passes through both ends of the support member 30 along the first direction Y. The support member 30 is made of an insulating material, and the elastic modulus of the material of the support member 30 is greater than or equal to 1000 MPa. Two buffer members 60 are correspondingly arranged for each battery cell group 20, and the buffer member 60 is arranged between the confluence component 40 and the bottom plate 11, and the buffer member 60 is bonded to the side of the confluence component 40 facing the bottom plate 11. Along the thickness direction X of the bottom plate, the two sides of the buffer 60 are respectively in contact with the converging component 40 and the bottom plate 11, one buffer 60 covers the first electrode terminals 212 of the plurality of battery cells 21, and the other buffer 60 covers the second electrode terminals 212 of the plurality of battery cells 21. In a plane perpendicular to the thickness direction X of the bottom plate, the orthographic projection of the pressure relief mechanism 213 does not overlap with the orthographic projection of the buffer 60. The buffer 60 is made of an insulating material, and the elastic modulus of the material of the buffer 60 is greater than or equal to 3 MPa and less than or equal to 100 MPa.

[0258] 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.

[0259] 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, characterized in that: include: The box body, including the bottom plate; A battery cell group is contained in the box, the battery cell group includes at least one battery cell, the battery cell includes a shell, an electrode terminal and a pressure relief mechanism, the shell has a wall portion, along the thickness direction of the bottom plate, the wall portion and the bottom plate are arranged facing each other, the electrode terminal and the pressure relief mechanism are both arranged on the shell, and at least one of the electrode terminal and the pressure relief mechanism is arranged on the wall portion; as well as A support member, disposed between the wall portion and the bottom plate and connected to the wall portion; Wherein, along the thickness direction of the bottom plate, the support member has a first surface away from the wall portion, and the first surface is closer to the bottom plate than the electrode terminal and the pressure relief mechanism.

2. The battery according to claim 1, characterized in that Along the thickness direction of the bottom plate, the first surface abuts against the bottom plate.

3. The battery according to claim 1, characterized in that The battery cell group includes a plurality of battery cells, and the plurality of battery cells are stacked along a first direction, and the first direction is perpendicular to a thickness direction of the bottom plate; The support member extends along the first direction, and the support member is connected to the wall portions of the outer shells of the plurality of battery cells in the battery cell group.

4. The battery according to claim 3, characterized in that The battery comprises a plurality of battery cell groups, and the plurality of battery cell groups are arranged along a second direction, and the second direction is perpendicular to the thickness direction of the bottom plate and the first direction; Wherein, along the second direction, every two adjacent battery cell groups share one supporting member, and the supporting member is connected to the wall portions of the outer shells of the battery cells of the two adjacent battery cell groups.

5. The battery according to claim 3, characterized in that A cavity is formed inside the support member, and the cavity passes through two ends of the support member along the first direction.

6. The battery according to claim 1, characterized in that A cavity is formed inside the support member.

7. The battery according to claim 1, characterized in that The support member is bonded to the wall portion.

8. The battery according to claim 1, characterized in that The elastic modulus of the material of the support member is greater than or equal to 1000 MPa.

9. The battery according to claim 1, characterized in that The supporting member is made of insulating material.

10. The battery according to claim 1, characterized in that The pressure relief mechanism is arranged on the wall portion; Wherein, in a plane perpendicular to the thickness direction of the bottom plate, the orthographic projection of the pressure relief mechanism does not overlap with the orthographic projection of the support member.

11. The battery according to claim 1, characterized in that The electrode terminal and the pressure relief mechanism are both arranged on the wall portion.

12. The battery according to any one of claims 1 to 11, characterized in that The electrode terminal is disposed on the wall portion; The battery further comprises a buffer member, which is arranged between the electrode terminal and the bottom plate along the thickness direction of the bottom plate, and at least a part of the projection of the electrode terminal is located in the buffer member.

13. The battery according to claim 12, characterized in that The buffer member covers the electrode terminal along a thickness direction of the bottom plate.

14. The battery according to claim 12, characterized in that The battery also includes: A current collecting component is disposed in the box body, and along the thickness direction of the bottom plate, the current collecting component is connected to one end of the electrode terminal facing the bottom plate to electrically connect the battery cells; Wherein, along the thickness direction of the bottom plate, the first surface is closer to the bottom plate than the flow collecting component, and the buffer is arranged between the flow collecting component and the bottom plate.

15. The battery according to claim 14, characterized in that Along the thickness direction of the bottom plate, two sides of the buffer member are respectively in contact with the flow collecting component and the bottom plate.

16. The battery according to claim 14, characterized in that The battery cell group includes a plurality of battery cells, the plurality of battery cells are stacked along a first direction, the busbar component connects the electrode terminals of the plurality of battery cells, and the first direction is perpendicular to the thickness direction of the bottom plate; The buffer member extends along the first direction, and covers the electrode terminals of the plurality of battery cells along the thickness direction of the bottom plate.

17. The battery according to claim 16, characterized in that The battery cell comprises two electrode terminals with opposite polarities, the two electrode terminals are respectively a first electrode terminal and a second electrode terminal, the first electrode terminal and the second electrode terminal are arranged on the wall portion at intervals along a second direction, and the second direction is perpendicular to the thickness direction of the bottom plate and the first direction; Among them, the battery cell group is correspondingly provided with two buffer members, the two buffer members are arranged at intervals along the second direction, and along the thickness direction of the bottom plate, one buffer member covers the first electrode terminals of multiple battery cells, and the other buffer member covers the second electrode terminals of multiple battery cells.

18. The battery according to claim 14, characterized in that The buffer is connected to the flow collecting component.

19. The battery according to claim 18, characterized in that The buffer is bonded to the flow collecting component.

20. The battery according to claim 12, characterized in that The elastic modulus of the material of the buffer component is greater than or equal to 3 MPa and less than or equal to 100 MPa.

21. The battery according to claim 12, characterized in that The buffer is made of insulating material.

22. The battery according to claim 12, characterized in that The pressure relief mechanism is arranged on the wall portion; Wherein, in a plane perpendicular to the thickness direction of the bottom plate, the orthographic projection of the pressure relief mechanism and the orthographic projection of the buffer component do not overlap.

23. The battery according to any one of claims 1 to 11, characterized in that The box also includes: A top plate, arranged opposite to the bottom plate along the thickness direction of the bottom plate and respectively located on both sides of the battery cell; Wherein, along the thickness direction of the bottom plate, the shell is connected to the top plate.

24. The battery according to claim 23, characterized in that The shell is bonded to the top plate.

25. The battery according to any one of claims 1 to 11, characterized in that The housing comprises: A shell, wherein a receiving cavity with an opening is formed inside, the receiving cavity is used to receive the electrode assembly, and the opening is located at one end of the shell facing the bottom plate in the thickness direction of the bottom plate; an end cap for closing the opening; Wherein, the end cover is the wall portion.

26. The battery according to any one of claims 1 to 11, characterized in that The housing comprises: The shell comprises an integrally formed side wall and the wall portion, wherein the side wall is arranged around the wall portion, and along the thickness direction of the bottom plate, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, and the side wall and the wall portion jointly define a receiving cavity for receiving the electrode assembly; An end cap closes the opening.

27. An electrical device, characterized in that: The invention comprises a battery as claimed in any one of claims 1 to 26, wherein the battery is used to provide electrical energy.

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