Battery and electric apparatus

Abstract

Provided are a battery (100) and an electric apparatus, which belong to the technical field of batteries. The battery (100) comprises a case (10), battery cell groups (20) and support members (30). The case (10) comprises a bottom plate (11). The battery cell groups (20) are accommodated in the case (10), and each battery cell group comprises at least one battery cell (21), the battery cell (21) comprising a casing (211), electrode terminals (212) and a pressure relief mechanism (213). The casing (211) has a wall portion (2111), wherein the wall portion (2111) is arranged to face the bottom plate (11) in the thickness direction of the bottom plate (11); and both the electrode terminals (212) and the pressure relief mechanism (213) are disposed on the casing (211), and at least one of the electrode terminals (212) and the pressure relief mechanism (213) is disposed on the wall portion (2111). The support members (30) are arranged between the wall portion (2111) and the bottom plate (11) and are connected to the wall portion (2111), and in the thickness direction of the bottom plate (11), each support member (30) has a first surface (31) facing away from the wall portion (2111), wherein the first surface (31) is closer to the bottom plate (11) than the electrode terminals (212) and the pressure relief mechanism (213). The support members (30) can protect the electrode terminals (212) or the pressure relief mechanism (213) of the battery cell (21), so as to reduce the risk of the battery cell (21) being damaged by impact, thereby facilitating the improvement of the service life and use reliability of the battery (100).

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application 2024208550070 entitled "Battery and Power Consumption Device", filed on April 23, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and more specifically, to a battery and an electrical device. Background Technology

[0004] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. A battery consists of a casing and individual battery cells housed within it. As a core component of new energy vehicles, batteries have high requirements in terms of both lifespan and reliability. A battery typically includes a casing and multiple battery cells housed within it. The outer casing of each battery cell has electrode terminals for inputting or outputting electrical energy, protruding from the outer surface of the casing. The casing also includes a pressure relief mechanism for releasing internal pressure. However, existing batteries are highly susceptible to damage to the electrode terminals or pressure relief mechanism when subjected to impacts during use, leading to battery cell damage, short lifespan, and low reliability.

[0005] Summary of the Invention

[0006] This application provides a battery and an electrical device that can effectively improve the battery's lifespan and reliability.

[0007] In a first aspect, embodiments of this application provide a battery, including a housing, a battery cell assembly, and a support member; the housing includes a base plate; the battery cell assembly is housed within the housing, the battery cell assembly including at least one battery cell, the battery cell including a casing, electrode terminals, and a pressure relief mechanism, the casing having a wall portion, the wall portion facing the base plate along the thickness direction of the base plate, the electrode terminals and the pressure relief mechanism both being disposed on the casing, and at least one of the electrode terminals and the pressure relief mechanism being disposed on the wall portion; the support member is disposed between the wall portion and the base plate and connected to the wall portion; wherein, along the thickness direction of the base plate, the support member has a first surface facing away from the wall portion, the first surface being closer to the base plate than the electrode terminals and the pressure relief mechanism.

[0008] In the above technical solution, the housing has a bottom plate located at the bottom of the battery cell, and the wall of the outer casing faces the bottom plate. At least one of the electrode terminals and the pressure relief mechanism of the battery cell is disposed on the wall, such that at least one of the electrode terminals and the pressure relief mechanism is disposed on the side of the outer casing facing the bottom plate. By providing a support member between the bottom plate of the housing and the wall of the outer casing, the support member is connected to the wall, and the first surface of the support member facing away from the wall is closer to the bottom plate than the electrode terminals and the pressure relief mechanism. With this structure, the battery can provide some support to the bottom plate of the housing through the support member when the battery is subjected to bottom impact during bottom ball impact test or use, thereby improving the deformation resistance of the bottom plate under external impact. This helps reduce the impact or collision of battery cells caused by deformation of the base plate. On the other hand, when the base plate of the casing is impacted or deformed, the impact force on the base plate can first contact the support components, and the support components can disperse the impact force on the base plate, increasing the force-bearing area. This alleviates the phenomenon of the impact force on the base plate being concentrated on the battery cells, thereby reducing the local force concentration on the battery cells and improving the protection of the electrode terminals or pressure relief mechanisms of the battery cells. This effectively reduces the risk of impact damage to the electrode terminals or pressure relief mechanisms of the battery cells, and also reduces the risk of leakage, fire or explosion of the battery cells, which helps to improve the service life and reliability of the battery.

[0009] In some embodiments, the first surface abuts against the base plate along the thickness direction of the base plate.

[0010] In the above technical solution, by abutting the first surface against the base plate, the support member is structured such that its two sides abut against the wall of the outer shell and the base plate of the box respectively in the thickness direction of the base plate. The battery with this structure can reduce the gap between the support member and the base plate. On the one hand, it can improve the utilization rate of the battery's internal space, which is conducive to improving the battery's energy density. On the other hand, it can improve the support effect of the support member on the base plate, so as to further improve the base plate's resistance to deformation when subjected to external impact, thereby helping to reduce the phenomenon of impact or collision of battery cells due to deformation of the base plate.

[0011] In some embodiments, the battery cell assembly includes a plurality of battery cells stacked along a first direction perpendicular to the thickness direction of the base plate; wherein, a support extends along the first direction and is connected to the walls of the outer shells of the plurality of battery cells in the battery cell assembly.

[0012] In the above technical solution, the battery cell group is provided with multiple battery cells stacked along the first direction. By setting the support member as a structure extending along the first direction and connecting the support member to the walls of the multiple battery cells in the battery cell group, the support member can support and protect the multiple battery cells in the battery cell group. Thus, while increasing the battery capacity, multiple battery cells in the battery cell group can be supported and protected by a single support member, eliminating the need for a separate support member for each battery cell. This effectively reduces the battery manufacturing cost and helps to reduce the assembly difficulty of the battery, thereby improving the assembly efficiency of the battery.

[0013] In some embodiments, the battery includes a plurality of battery cell groups arranged along a second direction, which is perpendicular to the thickness direction of the base plate and the first direction; wherein, along the second direction, every two adjacent battery cell groups share a support member, and the support member is connected to the wall of the outer casing of the battery cells in the two adjacent battery cell groups.

[0014] In the above technical solution, by sharing a support member between every two adjacent battery cell groups in the second direction, and with the support member connected to the walls of multiple battery cells in the two adjacent battery cell groups, the battery with this structure can, on the one hand, support and protect multiple battery cells in two adjacent battery cell groups with a single support member, which helps to reduce the manufacturing cost of the battery. On the other hand, the support member can distribute the impact force on the base plate to multiple battery cells in the two adjacent battery cell groups, thereby further mitigating the phenomenon of the impact force on the base plate being concentrated on the battery cells, further reducing the local force concentration on the battery cells, and thus further improving the protection of the electrode terminals or pressure relief mechanism of the battery cells, thereby reducing the risk of the electrode terminals or pressure relief mechanism of the battery cells being damaged by impact.

[0015] In some embodiments, a cavity is formed inside the support member, and the cavity extends through both ends of the support member along a first direction.

[0016] In the above technical solution, by setting a cavity inside the support member and setting the cavity to extend through both ends of the support member along the first direction, the weight of the support member can be reduced and the support member can be made capable of collapsing and absorbing energy when subjected to a large impact force. At the same time, the molding difficulty of the cavity of the support member can be reduced, which is conducive to reducing the manufacturing difficulty of the support member.

[0017] In some embodiments, a cavity is formed inside the support member.

[0018] In the above technical solution, by setting a cavity inside the support, the weight of the support can be reduced, which is beneficial to improving the energy density of the battery. On the other hand, the support can have 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 on the battery cells.

[0019] In some embodiments, the support is bonded to the wall.

[0020] In the above technical solution, the structure of adhesive connection is used to connect the support and the wall of the shell. On the one hand, it is convenient to assemble and helps to reduce the connection difficulty between the support and the wall of the shell. On the other hand, it can ensure that the connection and assembly between the support and the wall of the shell does not affect the battery cells, which helps to alleviate the phenomenon of the support damaging the battery cells.

[0021] In some embodiments, the elastic modulus of the material of the support member is greater than or equal to 1000 MPa.

[0022] In the above technical solution, by setting the elastic modulus of the material of the support component to be greater than or equal to 1000MPa, the support component has sufficient rigidity, thereby improving the support effect between the base plate and the battery cell when the base plate is subjected to impact deformation, and making the support component have sufficient anti-deformation ability so that the support component can better distribute and disperse the impact force.

[0023] In some embodiments, the support is made of an insulating material.

[0024] In the above technical solution, by setting the support component as an insulating material, the battery cell will not form a circuit connection with the support component, thereby reducing the risk of short circuits inside the battery and improving the reliability of the battery.

[0025] In some embodiments, the pressure relief mechanism is disposed on the wall portion; wherein, in a plane perpendicular to the thickness direction of the base plate, the orthographic projection of the pressure relief mechanism does not overlap with the orthographic projection of the support member.

[0026] In the above technical solution, by setting the pressure relief mechanism and the support member to have non-overlapping orthogonal projections in a plane perpendicular to the thickness direction of the base plate, the support member does not cover or obstruct the pressure relief mechanism in the thickness direction of the base plate, thereby reducing the obstruction and interference of the support member on the pressure relief mechanism, and improving the smoothness of the pressure relief mechanism when releasing the internal pressure of the battery cell.

[0027] In some embodiments, both the electrode terminals and the pressure relief mechanism are disposed on the wall portion.

[0028] In the above technical solution, by setting both the electrode terminals and the pressure relief mechanism on the wall, the electrode terminals and the pressure relief mechanism are located at the end of the battery cell's casing facing the bottom plate in the thickness direction, which facilitates assembly and manufacturing. Furthermore, the support member can simultaneously support and protect the electrode terminals and the pressure relief mechanism.

[0029] In some embodiments, electrode terminals are disposed on the wall portion; wherein the battery further includes a buffer member disposed between the electrode terminals and the base plate along the thickness direction of the base plate, and at least a portion of the projection of the electrode terminals is located within the buffer member.

[0030] In the above technical solution, the battery is also provided with a buffer. By placing the buffer between the electrode terminals and the base plate in the thickness direction of the base plate, and covering at least a portion of the electrode terminals in the thickness direction of the base plate, the buffer can absorb the impact force transmitted by the base plate when the base plate is deformed by impact, thereby reducing the impact force acting on the electrode terminals. This can buffer and protect the electrode terminals, further reducing the risk of battery cells being damaged by impact, which is beneficial to improving the battery's service life and reliability. On the other hand, the buffer can also further increase the support effect on the base plate when the base plate is deformed by impact, thereby further improving the base plate's resistance to deformation when subjected to external impact, which is beneficial to reducing the phenomenon of impact or collision with battery cells due to base plate deformation.

[0031] In some embodiments, the buffer covers the electrode terminals along the thickness direction of the base plate.

[0032] In the above technical solution, by setting the buffer to cover the electrode terminals in the thickness direction of the base plate, the projection of the electrode terminals in the thickness direction of the base plate is entirely located within the buffer, which helps to further enhance the buffering and protection effect of the buffer on the electrode terminals.

[0033] In some embodiments, the battery further includes a current-combining component; the current-combining component is disposed in the housing and connected to the end of the electrode terminal facing the bottom plate along the thickness direction of the base plate to electrically connect the battery cell; wherein, along the thickness direction of the base plate, the first surface is closer to the base plate than the current-combining component, and a buffer is disposed between the current-combining component and the base plate.

[0034] In the above technical solution, a current-combining component is also provided inside the battery casing. By connecting the current-combining component to the electrode terminals, the input or output of electrical energy from the battery cells can be realized. Specifically, by connecting the current-combining component to the end of the electrode terminals facing the base plate, and placing a buffer between the current-combining component and the base plate, the assembly and connection of the current-combining component and the electrode terminals is facilitated, reducing the assembly difficulty. Furthermore, the buffer also provides a certain degree of cushioning and protection for the current-combining component. In addition, by setting the first surface closer to the base plate than the current-combining component, the support component also provides a certain degree of support and protection for the current-combining component.

[0035] In some embodiments, along the thickness direction of the base plate, the two sides of the buffer abut against the busbar and the base plate, respectively.

[0036] In the above technical solution, by setting the buffer to abut against the busbar and the base plate on both sides in the thickness direction of the base plate respectively, the gap between the buffer and the base plate can be reduced. On the one hand, it can improve the utilization rate of the internal space of the battery, which is conducive to improving the energy density of the battery. On the other hand, it can improve the buffering effect of the buffer on the busbar and the electrode terminals, and further improve the support effect of the buffer on the base plate, so as to further improve the deformation resistance of the base plate when subjected to external impact, thereby helping to reduce the phenomenon of impact or collision of battery cells due to deformation of the base plate.

[0037] In some embodiments, the battery cell assembly includes multiple battery cells stacked along a first direction, and a busbar connects the electrode terminals of the multiple battery cells. The first direction is perpendicular to the thickness direction of the base plate. A buffer extends along the first direction and covers the electrode terminals of the multiple battery cells along the thickness direction of the base plate.

[0038] In the above technical solution, the battery cell group is provided with multiple battery cells stacked along a first direction, and the busbar connects the electrode terminals of the multiple battery cells to realize parallel or series connection between the multiple battery cells. The structure is simple and easy to implement. Specifically, by setting the buffer to extend along the first direction and covering the electrode terminals of the multiple battery cells in the thickness direction of the base plate, the buffer can buffer and protect the electrode terminals of the multiple battery cells in the battery cell group. This eliminates the need for a separate buffer for each battery cell's electrode terminal, which helps reduce battery manufacturing costs and assembly difficulty, thereby improving battery assembly efficiency.

[0039] In some embodiments, a battery cell includes two electrode terminals with opposite polarities, namely a first electrode terminal and a second electrode terminal, which are spaced apart on the wall along a second direction perpendicular to the thickness direction of the base plate and the first direction; wherein, the battery cell group is provided with two buffer members, which are spaced apart along the second direction. 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.

[0040] In the above technical solution, each battery cell is provided with a first electrode terminal and a second electrode terminal with opposite polarities to input or output the positive and negative electrodes of the battery cell respectively. By providing two buffers for each battery cell group, one buffer covers the first electrode terminals of multiple battery cells and the other buffer 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 by the two buffers respectively. The structure is simple and easy to assemble.

[0041] In some embodiments, the buffer is connected to the busbar.

[0042] In the above technical solution, by connecting the buffer to the busbar component, the reliability of the buffer between the base plate and the busbar component is improved. On the one hand, it is convenient to assemble the buffer between the base plate and the busbar component, and the buffer, busbar component and battery cell assembly can be assembled into a whole before being assembled into the housing. This helps to reduce the assembly difficulty of 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, thereby improving the stability of the battery.

[0043] In some embodiments, the buffer is bonded to the busbar component.

[0044] In the above technical solution, the structure of adhesive connection is used to connect the buffer and the busbar component. On the one hand, it is easy to assemble and helps to reduce the difficulty of connecting the buffer and the busbar component. On the other hand, it can ensure that the connection and assembly between the buffer and the busbar component does not affect the busbar component, which helps to alleviate the phenomenon of the buffer damaging the busbar component.

[0045] In some embodiments, the elastic modulus of the buffer material is greater than or equal to 3 MPa and less than or equal to 100 MPa.

[0046] In the above technical solution, the elastic modulus of the buffer material 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 buffer material to be greater than or equal to 3MPa, the phenomenon that the buffer is too soft and therefore has poor effect in absorbing impact force can be alleviated, and the phenomenon that the buffer is not good at distributing and dispersing impact force can also be alleviated. On the other hand, by setting the elastic modulus of the buffer material to be less than or equal to 100MPa, the phenomenon that the buffer is too stiff and therefore directly transmits the impact force received to the electrode terminal can be alleviated, thereby improving the buffering and protection effect of the buffer on the electrode terminal.

[0047] In some embodiments, the buffer is made of insulating material.

[0048] In the above technical solution, by setting the buffer as 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.

[0049] In some embodiments, the pressure relief mechanism is disposed on the wall portion; wherein, in a plane perpendicular to the thickness direction of the base plate, the orthographic projection of the pressure relief mechanism does not overlap with the orthographic projection of the buffer.

[0050] In the above technical solution, by setting the pressure relief mechanism and the buffer to have non-overlapping orthogonal projections in a plane perpendicular to the thickness direction of the base plate, the buffer does not cover or obstruct the pressure relief mechanism in the thickness direction of the base plate, thereby reducing the obstruction and interference of the buffer on the pressure relief mechanism, and improving the smoothness of the pressure relief mechanism when releasing the internal pressure of the battery cell.

[0051] In some embodiments, the housing further includes a top plate; the top plate and the bottom plate are disposed opposite 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.

[0052] In the above technical solution, by connecting the outer shell of the battery cell to the top plate of the box, the battery cell is suspended inside the box. On the one hand, this reduces the load on the bottom plate and improves its load-bearing capacity. On the other hand, it alleviates the phenomenon of the battery cell being pressed against the bottom plate by the support, thereby optimizing the stress on the support and improving the support and protection of the battery cell when the bottom plate is impacted.

[0053] In some embodiments, the housing is bonded to the top plate.

[0054] In the above technical solution, the battery cell shell and the top plate of the box are connected by an adhesive connection. On the one hand, this facilitates assembly and reduces the difficulty of connecting the battery cell shell and the top plate of the box. On the other hand, it ensures that the connection and assembly between the battery cell shell and the top plate of the box does not affect the battery cell, which helps to alleviate the phenomenon of battery cell damage.

[0055] In some embodiments, the housing includes a housing and an end cap; the interior of the housing forms a receiving cavity with an opening for receiving an electrode assembly, the opening being located at one end of the housing facing the base plate in the thickness direction; the end cap closes the opening; wherein the end cap is a wall portion.

[0056] In the above technical solution, by setting the wall of the outer casing as an end cap for sealing the opening, the battery cell with this structure is easy to assemble electrode terminals or pressure relief mechanisms on the end cap, and can reduce the difficulty of electrical connection between electrode terminals and electrode components, thereby reducing the manufacturing difficulty of the battery cell and improving the production efficiency of the battery cell.

[0057] In some embodiments, the housing includes a housing and an end cap; the housing includes an integrally formed sidewall and a wall portion, the sidewall surrounding the wall portion, one end of the sidewall being connected to the wall portion along the thickness direction of the base plate, and the other end forming an opening, the sidewall and the wall portion together defining a receiving cavity for accommodating an electrode assembly; the end cap closes the opening.

[0058] In the above technical solution, by setting the wall of the outer casing as the bottom wall of the casing opposite to the end cap in the thickness direction of the wall, the battery cell with this structure can ensure that the area of ​​the outer casing where the electrode terminals or pressure relief mechanism are set is far away from the end cap. On the one hand, it can alleviate the phenomenon that the pulling or torsional force of other components on the electrode terminals is directly applied to the end cap, thereby reducing the risk of connection failure between the end cap and the casing and helping to reduce the risk of leakage during battery cell use. On the other hand, it can alleviate the phenomenon that the stress generated by the connection between the end cap and the casing is applied to the pressure relief mechanism, thereby reducing the phenomenon of damage to the pressure relief mechanism or premature valve opening, which in turn helps to improve the service life and reliability of the battery cell.

[0059] Secondly, embodiments of this application also provide an electrical device, including the battery described above, which is used to provide electrical energy. Attached Figure Description

[0060] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0061] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0062] Figure 2 is an exploded view of the battery structure provided in some embodiments of this application;

[0063] Figure 3 is a schematic diagram of the structure of a battery (after removing the base plate) provided in some embodiments of this application;

[0064] Figure 4 is a cross-sectional view of a battery provided in some embodiments of this application;

[0065] Figure 5 is a magnified view of part A of the battery shown in Figure 4;

[0066] Figure 6 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0067] Figure 7 is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0068] Figure 8 is a schematic diagram of the structure of the battery support provided in some embodiments of this application;

[0069] Figure 9 is a magnified view of part B of the battery shown in Figure 4.

[0070] Icons: 1000 - Vehicle; 100 - Battery; 10 - Housing; 11 - Base plate; 12 - Top plate; 13 - Frame; 20 - Battery cell pack; 21 - Battery cell; 211 - Housing; 2111 - Wall; 2112 - Housing; 2112a - Opening; 2113 - End cap; 212 - Electrode terminal; 213 - Pressure relief mechanism; 214 - Electrode assembly; 2141 - Tab; 215 - Current collector; 30 - Support; 31 - First surface; 32 - Cavity; 33 - Assembly hole; 40 - Current collector component; 50 - Electrode output seat; 60 - Buffer; 200 - Controller; 300 - Motor; X - Thickness direction of base plate; Y - First direction; Z - Second direction. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0072] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0073] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0074] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0075] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0076] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0077] In this application, "multiple" means two or more (including two).

[0078] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0079] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0080] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0081] In some embodiments, the positive electrode may be a positive electrode sheet, which 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.

[0082] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0083] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be 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. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0084] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide 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, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0085] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0086] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0087] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can 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.).

[0088] 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.

[0089] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0090] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0091] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0092] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0093] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0094] As an example, the material of the separator may include at least one of glass fiber, nonwoven 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 it may be attached to the surfaces of the positive and negative electrodes.

[0095] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0096] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0097] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0098] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0099] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0100] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0101] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0102] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0103] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0104] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0105] In some implementations, the electrode assembly is a stacked structure.

[0106] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0107] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0108] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0109] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0110] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0111] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0112] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0113] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0114] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0115] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0116] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0117] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0118] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0119] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0120] Batteries possess outstanding advantages such as high energy density, low environmental pollution, high power density, long lifespan, wide applicability, and low self-discharge coefficient, making them a crucial component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, battery safety must also be taken into account.

[0121] For a typical battery, it usually consists of a casing and multiple battery cells housed within the casing. Each battery cell includes a housing and electrode terminals on the housing. Connecting the electrode terminals of multiple battery cells via a busbar allows for series or parallel connection between the cells. The battery cell housing also features a pressure relief mechanism to release internal pressure and reduce the risk of explosion due to thermal runaway. However, due to the complex operating conditions of batteries, they are frequently subjected to impacts from the external environment, making the casing highly susceptible to compression after deformation from such impacts. Impacts can directly transfer force to individual battery cells, easily damaging the pressure relief mechanism and protruding electrode terminals on the battery cell's casing. This is especially true in structures where battery cells are placed upside down inside the casing, where the electrode terminals and pressure relief mechanism are located at the bottom of the battery cell. This makes it extremely easy for the bottom of the battery cell to be impacted or subjected to bottom ball impact tests, potentially leading to damage or leakage of the battery cell, or even fire or explosion during use. This negatively impacts the battery's lifespan and reliability.

[0122] Based on the above considerations, in order to solve the problems of short battery life and low reliability, this application provides a battery including a casing, a battery cell assembly, and a support member. The casing includes a base plate. The battery cell assembly is housed within the casing, and the battery cell assembly includes at least one battery cell. Each battery cell includes a housing, electrode terminals, and a pressure relief mechanism. The housing has a wall portion, which faces the base plate along its thickness direction. Both the electrode terminals and the pressure relief mechanism are disposed within the housing, and at least one of the electrode terminals and the pressure relief mechanism is disposed within the wall portion. The support member is disposed between the wall portion and the base plate and is connected to the wall portion. Along the thickness direction of the base plate, the support member has a first surface facing away from the wall portion, and this first surface is closer to the base plate than the electrode terminals and the pressure relief mechanism.

[0123] In this battery structure, the casing has a base plate located at the bottom of the individual battery cells. The outer wall faces the base plate, and at least one of the electrode terminals and pressure relief mechanism of the individual battery cells is disposed on the wall. This ensures that the side of the outer casing facing the base plate has both the electrode terminals and the pressure relief mechanism. A support member is provided between the base plate and the outer wall, connected to the wall. The first surface of the support member facing away from the wall is closer to the base plate than the electrode terminals and pressure relief mechanism. This battery structure allows the support member to provide some support to the base plate during bottom impact tests or use, thereby improving the base plate's resistance to deformation under external impact. This helps reduce the impact or collision of battery cells caused by deformation of the base plate. On the other hand, when the base plate of the casing is impacted or deformed, the impact force on the base plate can first contact the support components, and the support components can disperse the impact force on the base plate, increasing the force-bearing area. This alleviates the phenomenon of the impact force on the base plate being concentrated on the battery cells, thereby reducing the local force concentration on the battery cells and improving the protection of the electrode terminals or pressure relief mechanisms of the battery cells. This effectively reduces the risk of impact damage to the electrode terminals or pressure relief mechanisms of the battery cells, and also reduces the risk of leakage, fire or explosion of the battery cells, which helps to improve the service life and reliability of the battery.

[0124] The batteries disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system comprising such an electrical device can be constructed using batteries disclosed in this application. This helps to mitigate the problem of individual battery cells being damaged by impacts during use, thereby improving battery life and reliability.

[0125] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0126] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0127] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is installed inside the vehicle 1000. The battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0128] In some embodiments of this application, the battery 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0129] According to some embodiments of this application, referring to Figures 2, 3, 4, and 5, Figure 2 is an exploded view of the battery 100 provided in some embodiments of this application; Figure 3 is a structural schematic diagram of the battery 100 (after removing the bottom plate 11) provided in some embodiments of this application; Figure 4 is a cross-sectional view of the battery 100 provided in some embodiments of this application; Figure 5 is a partial enlarged view of point A of the battery 100 shown in Figure 4; and Figure 6 is a structural schematic diagram of the battery cell 21 provided in some embodiments of this application. This application provides a battery 100, which includes a housing 10, a battery cell group 20, and a support member 30. The housing 10 includes a bottom plate 11. A battery cell assembly 20 is housed within a casing 10. The battery cell assembly 20 includes at least one battery cell 21. Each battery cell 21 includes a housing 211, electrode terminals 212, and a pressure relief mechanism 213. The housing 211 has a wall portion 2111 facing the base plate 11 along the thickness direction X. Both the electrode terminals 212 and the pressure relief mechanism 213 are disposed within the housing 211, and at least one of the electrode terminals 212 and the pressure relief mechanism 213 is disposed within the wall portion 2111. A support member 30 is disposed between and connected to the wall portion 2111. Along the thickness direction X of the base plate, the support member 30 has a first surface 31 facing away from the wall portion 2111. The first surface 31 is closer to the base plate 11 than the electrode terminals 212 and the pressure relief mechanism 213.

[0130] The housing 10 provides assembly space for the battery cells 21, and the housing 10 can adopt various structures. In Figure 2, the housing 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, that is, the frame 13 is an annular structure surrounding the outside of the battery cell assembly 20. The bottom plate 11 and the top plate 12 are arranged opposite to each other 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 13 in the thickness direction X of the bottom plate, so that the bottom plate 11, the top plate 12, and the frame 13 together define the assembly space for accommodating the battery cells 21.

[0131] Along the thickness direction X of the base plate, the base plate 11 serves to support the battery cell group 20 or other components within the battery 100. That is, the thickness direction X of the base plate is the direction of gravity or approximately the direction of gravity, and the base plate 11 is located at the bottom of the battery cell 21 in the thickness direction X of the base plate. Correspondingly, the top plate 12 is located at the top of the battery cell 21.

[0132] For example, the bottom plate 11, the top plate 12 and the frame 13 are separate but connected structures to facilitate the assembly of components such as the battery cell 21 into the housing 10.

[0133] 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 means of bonding, welding or bolting. Similarly, the top plate 12 can also be connected to the side of the frame 13 away from the base plate 11 in the thickness direction X of the base plate by means of bonding, welding or bolting.

[0134] It should be noted that in some embodiments, the structure of the housing 10 can be various. For example, the bottom plate 11 and the frame 13 can be integrally formed, while the top plate 12 and the frame 13 can be separately formed. Of course, the top plate 12 and the frame 13 can also be integrally formed, while the bottom plate 11 and the frame 13 can be separately formed.

[0135] Of course, the box 10 can also be of various shapes, such as a cylinder, cuboid, or cube. For example, in Figures 2 and 3, the box 10 is a cuboid. The height direction of the box 10 is the thickness direction X of the base plate, the width direction of the box 10 is the first direction Y, and the length direction of the box 10 is the second direction Z. The thickness direction X of the base plate, the first direction Y, and the second direction Z are all perpendicular to each other.

[0136] Optionally, in the battery 100, there may be one or more battery cell groups 20 housed within the housing 10. When there are multiple battery cell groups 20 housed within the housing 10, the multiple battery cell groups 20 may be connected in series, in parallel, or in a mixed manner. A mixed manner means that the multiple battery cell groups 20 are connected in both series and parallel.

[0137] For example, in Figures 2 and 3, the battery 100 may include a plurality of battery cell groups 20 arranged along a second direction Z.

[0138] Similarly, the battery cell pack 20 includes at least one battery cell 21, meaning that each battery cell pack 20 may contain one or more battery cells 21. When the battery cell pack 20 includes multiple battery cells 21, the multiple battery cells 21 may be connected in series, parallel, or in a mixed configuration.

[0139] For example, in Figures 2 and 3, 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 arranged in an array and assembled within the housing 10. For example, the first direction Y is the thickness direction of the battery cells 21, such that the plurality of battery cells 21 in the battery cell group 20 are stacked along the thickness direction of the battery cells 21.

[0140] In some embodiments, as shown in Figures 2 and 3, the battery 100 may further include a busbar 40, which is used to electrically connect a plurality of battery cells 21 in the battery cell group 20 to realize series or parallel connection between the plurality of battery cells 21 in the battery cell group 20. The busbar 40 is also used to electrically connect two adjacent battery cell groups 20 to realize series or parallel connection between the two adjacent battery cell groups 20. The busbar 40 is connected to the electrode terminal 212 of the battery cell 21.

[0141] In some embodiments, as shown in Figures 2 and 3, the battery 100 may further include an electrode output socket 50, which is installed inside the housing 10 and connected to the busbar 40 to output or input electrical energy from the battery 100.

[0142] Optionally, each battery cell 21 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 21 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in Figure 6, the battery cell 21 is a cuboid structure. Correspondingly, the thickness direction X of the base 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.

[0143] In this embodiment, the outer casing 211 can also be used to contain an electrolyte, such as an electrolyte solution. The outer casing 211 can have various structural forms. The material of the outer casing 211 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0144] Referring to Figure 6, and further referring to Figure 7, Figure 7 is an exploded view of the structure of a battery cell 21 provided in some embodiments of this application. The battery cell 21 also includes an electrode assembly 214, which is housed within a housing 211 and electrically connected to electrode terminals 212 to enable the input or output of electrical energy from the battery cell 21. The housing 211 may include a shell 2112 and an end cap 2113. The shell 2112 has an internal cavity with an opening 2112a at one end, meaning the shell 2112 is a hollow structure with one open end. The end cap 2113 covers the opening 2112a of the shell 2112, forming a sealed connection to create a sealed space for accommodating the electrode assembly 214 and the electrolyte.

[0145] Optionally, the wall portion 2111 for setting the electrode terminal 212 or the pressure relief mechanism 213 can be an end cap 2113 or one of the multiple walls of the housing 2112. For example, referring to Figures 6 and 7, the wall portion 2111 can also be an end cap 2113 of the housing 211. Correspondingly, the opening 2112a is located at one end of the housing 2112 facing the bottom plate 11 of the box 10 in the thickness direction X of the bottom plate, such that the thickness direction X of the bottom plate is the thickness direction of both the wall portion 2111 and the end cap 2113. Of course, in other embodiments, the wall portion 2111 can also be a bottom wall of the housing 2112 disposed opposite to the end cap 2113 in the thickness direction X of the bottom plate. Correspondingly, the thickness direction X of the bottom plate is the arrangement direction of the end cap 2113 and the wall portion 2111. Similarly, the wall portion 2111 can also be a side wall adjacent to and abutting against the end cap 2113 of the housing 2112.

[0146] Along the thickness direction X of the base plate, the wall portion 2111 faces the base plate 11, that is, the wall of the outer casing 211 of the battery cell 21 facing the base plate 11 in the thickness direction X of the base plate is the wall portion 2111.

[0147] When assembling the battery cell 21, the electrode assembly 214 can be placed into the housing 2112 first, and the electrolyte can be filled into the housing 2112. Then, the end cap 2113 can be placed on the opening 2112a of the housing 2112 to close the opening 2112a of the housing 2112.

[0148] The housing 2112 can have various shapes, such as a cylinder or a cuboid. The shape of the housing 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, then the housing 2112 can be a cylindrical structure; if the electrode assembly 214 is a cuboid structure, then the housing 2112 can be a cuboid structure. Of course, the end cap 2113 can also have various structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figures 6 and 7, the housing 2112 is a cuboid structure.

[0149] Understandably, the housing 211 is not limited to the structure described above. The housing 211 can also be other structures. For example, the housing 211 includes a shell 2112 and two end caps 2113. The shell 2112 is a hollow structure with openings 2112a on opposite sides. One end cap 2113 is fitted onto one opening 2112a of the shell 2112 to form a sealed connection, thereby forming a sealed space for accommodating the electrode assembly 214 and the electrolyte.

[0150] Electrode assembly 214 is a component in battery cell 21 where electrochemical reactions occur. The structure of electrode assembly 214 can be various. For example, electrode assembly 214 can be a wound structure formed by winding positive electrode, separator and negative electrode, or a stacked structure formed by stacking positive electrode, separator and negative electrode.

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

[0152] One end of the electrode assembly 214 has a tab 2141, which is used to input or output the positive or negative electrode of the electrode assembly 214. The tab 2141 is used to connect with the electrode terminal 212 to realize the electrical connection between the electrode assembly 214 and the electrode terminal 212. It should be noted that the tab 2141 of the electrode assembly 214 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer, or a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer. If the tab 2141 is used to output the positive electrode of the electrode assembly 214, then the tab 2141 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer; if the tab 2141 is used to output the negative electrode of the electrode assembly 214, then the tab 2141 is a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer.

[0153] Optionally, the electrode assembly 214 housed within the housing 211 can be one or more. For example, in FIG7, the housing 211 of the battery cell 21 is provided with two electrode assemblies 214, which 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 assembly 214 housed within the housing 211 can be one, three, four, five, six, seven, or eight, etc.

[0154] In this embodiment, the electrode terminal 212 serves to output or input electrical energy from the battery cell 21. The electrode terminal 212 is insulatedly mounted on the housing 211 and protrudes from the outer surface of the housing 211, meaning that no electrical connection is formed between the electrode terminal 212 and the housing 211.

[0155] For example, in Figures 5 and 6, the electrode terminal 212 is insulatedly mounted on the wall portion 2111 and protrudes from the side of the wall portion 2111 facing the base plate 11 in the thickness direction X of the base 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 wall portion 2111 facing the base plate 11 in the thickness direction X of the base plate towards the base plate 11. Similarly, the material of the electrode terminal 212 can be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0156] Optionally, the electrode terminal 212 can be directly connected to the tab 2141 of the electrode assembly 214, such as by welding or abutting, or it can be indirectly connected to the tab 2141 of the electrode assembly 214 through other components.

[0157] In some embodiments, as shown in FIG7, the battery cell 21 may further include a current collector 215 disposed within the housing 211. The current collector 215 connects the electrode terminal 212 and the tab 2141 of the electrode assembly 214 to realize the electrical connection between the electrode assembly 214 and the electrode terminal 212.

[0158] For example, the current collector 215 is welded to the electrode terminal 212, and the current collector 215 is also welded to the tab 2141 of the electrode assembly 214. Of course, in other embodiments, the current collector 215 may also be a structure that abuts against the electrode terminal 212, and similarly, the current collector 215 may also be a structure that abuts against the tab 2141 of the electrode assembly 214.

[0159] In Figures 6 and 7, the battery cell 21 includes two electrode terminals 212 and two current collectors 215. The two electrode terminals 212 are spaced apart along the second direction Z on the wall portion 2111, and the two current collectors 215 are spaced apart along the second direction Z inside the housing 211. Correspondingly, each electrode assembly 214 has two tabs 2141, which are spaced apart along the second direction Z and have opposite polarities. The two electrode terminals 212 are electrically connected to the two tabs 2141 of the electrode assembly 214 through the two current collectors 215, respectively, 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 used to output or input the positive and negative electrodes of the battery cell 21, respectively. Correspondingly, the two tabs 2141 are the positive and negative tabs of the electrode assembly 214.

[0160] In this embodiment, the pressure relief mechanism 213 serves to release the internal pressure of the battery cell 21 when the internal pressure or temperature of the battery cell 21 reaches a predetermined value.

[0161] 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 may be disposed on the wall portion 2111. For example, in Figures 5 and 6, the pressure relief mechanism 213 is also disposed on the wall portion 2111, that is, both the electrode terminal 212 and the pressure relief mechanism 213 are disposed on the wall portion 2111. In Figure 7, the wall portion 2111 is an end cap 2113, and correspondingly, both the electrode terminal 212 and the pressure relief mechanism 213 are disposed on the end cap 2113 of the housing 211.

[0162] It should be noted that in other embodiments, only the electrode terminal 212 may be disposed on the wall portion 2111, while the pressure relief mechanism 213 may be disposed on other walls of the housing 211. Alternatively, only the pressure relief mechanism 213 may be disposed on the wall portion 2111, while the electrode terminal 212 may be disposed on other walls of the housing 211.

[0163] Optionally, the pressure relief mechanism 213 and the outer shell 211 can be an integrally formed structure or a separate structure. If the pressure relief mechanism 213 and the outer shell 211 are separate structures, the pressure relief mechanism 213 can be connected to the outer shell 211 by welding or other means. Correspondingly, the pressure relief mechanism 213 can be a pressure relief component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve, or safety valve. If the pressure relief mechanism 213 and the outer shell 211 are an integrally formed structure, the pressure relief mechanism 213 is a region on the outer shell 211 with a weak structure, such as a region on the outer shell 211 with a groove.

[0164] In this embodiment, the support member 30 is disposed in the thickness direction X of the base plate between the base plate 11 of the housing 10 and the wall portion 2111 of the outer shell 211 of the battery cell 21, and the support member 30 is connected to the wall portion 2111 to provide support between the base plate 11 of the housing 10 and the wall portion 2111 of the outer shell 211 of the battery cell 21. The support member 30 can be made of various materials. It can be an insulating material, such as carbon fiber, epoxy resin, polyurethane resin, plastic, or ceramic. Alternatively, it can be a metal material, such as copper, iron, aluminum, steel, or aluminum alloy. It should be noted that when the support member 30 is made of metal, an insulating film needs to be wrapped around its outer surface to insulate it from the battery cell 21 and other components such as the housing 10.

[0165] Optionally, the connection structure between the support member 30 and the wall portion 2111 can be various, such as adhesive bonding, bolting, or snap-fitting.

[0166] Along the thickness direction X of the base plate, the support member 30 has a first surface 31 facing away from the wall portion 2111. The first surface 31 is closer to the base plate 11 than the electrode terminal 212 and the pressure relief mechanism 213. 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 electrode terminal 212, and between the base plate 11 and the pressure relief mechanism 213. This ensures that when the base plate 11 and the first surface 31 of the support member 30 are in contact or not in contact, the electrode terminal 212 and the pressure relief mechanism 213 are spaced apart from the base plate 11 in the thickness direction X of the base plate. In other words, the electrode terminal 212 and the pressure relief mechanism 213 are both at a distance from the base plate 11 in the thickness direction X of the base plate.

[0167] It should be noted that when only the electrode terminal 212 is provided on the wall portion 2111, the first surface 31 is closer to the base plate 11 in the thickness direction X of the base plate than the electrode terminal 212. When only the pressure relief mechanism 213 is provided on the wall portion 2111, the first surface 31 is closer to the base plate 11 in the thickness direction X of the base plate than the pressure relief mechanism 213. If both the electrode terminal 212 and the pressure relief mechanism 213 are provided on the wall portion 2111, the first surface 31 is closer to the base plate 11 in the thickness direction X of the base plate than both the electrode terminal 212 and the pressure relief mechanism 213.

[0168] In this embodiment, the housing 10 has a bottom plate 11 located at the bottom of the battery cell 21. The wall portion 2111 of the outer casing 211 faces the bottom plate 11, and at least one of the electrode terminals 212 and the pressure relief mechanism 213 of the battery cell 21 is disposed on the wall portion 2111, such that at least one of the electrode terminals 212 and the pressure relief mechanism 213 is disposed on the side of the outer casing 211 facing the bottom plate 11. By providing a support member 30 between the bottom plate 11 of the housing 10 and the wall portion 2111 of the outer casing 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 terminals 212 and the pressure relief mechanism 213, the battery 100 with this structure can, on the one hand, provide a certain degree of support to the bottom plate 11 of the housing 10 when the battery 100 is subjected to bottom impact during bottom ball impact test or use, through the support member 30. Improving the deformation resistance of the base plate 11 under external impact helps reduce the impact or collision of the battery cell 21 caused by deformation of the base plate 11. On the other hand, when the base plate 11 of the housing 10 is impacted or deformed, the impact force on the base plate 11 can be made to contact the support member 30 first, and the impact force on the base plate 11 can be dispersed by the support member 30, increasing the force-bearing area, thereby alleviating the phenomenon of the impact force on the base plate 11 being concentrated on the battery cell 21. This reduces the local force concentration on the battery cell 21, thereby improving the protection of the electrode terminals 212 or pressure relief mechanism 213 of the battery cell 21. This effectively reduces the risk of impact damage to the electrode terminals 212 or pressure relief mechanism 213 of the battery cell 21, and reduces the risk of leakage, fire or explosion of the battery cell 21, which helps to improve the service life and reliability of the battery 100.

[0169] According to some embodiments of this application, referring to Figures 4 and 5, and further referring to Figure 8, Figure 8 is a structural schematic diagram of the support member 30 of the battery 100 provided in some embodiments of this application. Along the thickness direction X of the base plate, the first surface 31 abuts against the base plate 11. That is, the support member 30 abuts against the base plate 11 and the wall portion 2111 on both sides in the thickness direction X of the base plate, respectively.

[0170] In this embodiment, by abutting the first surface 31 against the base plate 11, the support member 30 is structured such that its two sides in the thickness direction X of the base plate abut against the wall portion 2111 of the outer shell 211 and the base plate 11 of the housing 10, respectively. The battery 100 with this structure can reduce the gap between the support member 30 and the base plate 11. On the one hand, it can improve the utilization rate of the internal space of the battery 100, which is conducive to improving the energy density of the battery 100. On the other hand, it can improve the support effect of the support member 30 on the base plate 11, so as to further improve the deformation resistance of the base 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 base plate 11.

[0171] According to some embodiments of this application, referring to Figures 2, 3, and 5, the battery cell assembly 20 includes a plurality of battery cells 21, which are stacked along a first direction Y, perpendicular to the thickness direction X of the base plate. A support member 30 extends along the first direction Y and is connected to the walls 2111 of the outer shells 211 of the plurality of battery cells 21 in the battery cell assembly 20.

[0172] The battery cell group 20 includes multiple battery cells 21, which are stacked along the first direction Y. That is, each battery cell group 20 is composed of multiple battery cell groups 20 stacked along the first direction Y.

[0173] For example, in Figures 2 and 3, 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.

[0174] 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 disposed between the multiple battery cells 21 in the battery cell group 20 and the base 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 a support member 30.

[0175] In this embodiment, the battery cell pack 20 is provided with a plurality of battery cells 21 stacked along the first direction Y. By setting the support member 30 as a structure extending along the first direction Y, and the support member 30 being connected to the wall portion 2111 of the plurality of battery cells 21 in the battery cell pack 20, the support member 30 can support and protect the plurality of battery cells 21 in the battery cell pack 20. Thus, while increasing the capacity of the battery 100, the support member 30 can be used to support and protect the plurality of battery cells 21 in the battery cell pack 20, without the need to set a support member 30 for each battery cell 21. This can effectively reduce the manufacturing cost of the battery 100 and help reduce the assembly difficulty of the battery 100, thereby improving the assembly efficiency of the battery 100.

[0176] In some embodiments, referring to Figures 2, 3, 4, and 5, the battery 100 includes a plurality of battery cell groups 20 arranged along a second direction Z, which is perpendicular to the thickness direction X and the first direction Y of the base plate. 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 portion 2111 of the outer casing 211 of the battery cells 21 of the two adjacent battery cell groups 20.

[0177] The battery 100 includes multiple battery cell groups 20, which are arranged along the second direction Z. In other words, the battery 100 contains multiple battery cells 21 arranged in a specific pattern.

[0178] For example, in Figures 2 and 3, 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.

[0179] Along the second direction Z, each pair of adjacent battery cell groups 20 shares a support member 30. The support member 30 is connected to the wall portion 2111 of the outer shell 211 of the battery cells 21 in the two adjacent battery cell groups 20. That is, in Figure 5, the support member 30 disposed between the two adjacent battery cell groups 20 can support and protect multiple battery cells 21 in the two adjacent battery cell groups 20. The support member 30 is connected to the wall portion 2111 of the outer shell 211 of the battery cells 21 in the two adjacent battery cell groups 20. That is, part of the support member 30 located between the two adjacent battery cell groups 20 is used to support multiple battery cells 21 in one battery cell group 20, and the other part is used to support multiple battery cells 21 in another battery cell group 20.

[0180] In this embodiment, by sharing a support member 30 between every two adjacent battery cell groups 20 in the second direction Z, and with the support member 30 connected to the walls 2111 of multiple battery cells 21 in the two adjacent battery cell groups 20, the battery 100 with this structure can support and protect multiple battery cells 21 in the two adjacent battery cell groups 20 with a single support member 30, which helps reduce the manufacturing cost of the battery 100. On the other hand, the support member 30 can distribute the impact force on the base plate 11 to the multiple battery cells 21 in the two adjacent battery cell groups 20, thereby further mitigating the phenomenon of the impact force on the base plate 11 being concentrated on the battery cells 21, further reducing the local force concentration on the battery cells 21, and further enhancing the protection of the electrode terminals 212 or pressure relief mechanism 213 of the battery cells 21, thereby reducing the risk of the electrode terminals 212 or pressure relief mechanism 213 of the battery cells 21 being damaged by impact.

[0181] According to some embodiments of this application, as shown in Figures 2, 5 and 8, a cavity 32 is formed inside the support member 30. That is, the support member 30 is a hollow structure.

[0182] It should be noted that, in other embodiments, reinforcing ribs may also be provided in the cavity 32 of the support member 30, and the reinforcing ribs are connected to the cavity wall surface of the cavity 32 to improve the structural strength of the support member 30.

[0183] In this embodiment, by providing a cavity 32 inside the support member 30, 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.

[0184] In some embodiments, as shown in Figures 2 and 8, a cavity 32 is formed inside the support member 30, and the cavity 32 extends through both ends of the support member 30 along the first direction Y. That is, the cavity 32 is a structure that extends along the first direction Y, and the cavity 32 extends through the end faces of both ends of the support member 30 in the first direction Y.

[0185] Optionally, as shown in Figures 2 and 8, the support member 30 is also provided with an assembly hole 33. The assembly hole 33 penetrates the support member 30 along the thickness direction X of the bottom plate and communicates with the cavity 32. The assembly hole 33 is used for bolt insertion so that the support member 30 can also be bolted to the housing 10.

[0186] For example, the support member 30 is provided with two mounting holes 33, which are located at two ends of the support member 30 in the first direction Y, and the support member 30 is bolted to the frame 13 of the housing 10.

[0187] In this embodiment, by providing a cavity 32 inside the support member 30 and setting the cavity 32 to extend through both ends of the support member 30 along the first direction Y, the weight of the support member 30 can be reduced and the support member 30 can be made capable of collapsing and absorbing 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.

[0188] According to some embodiments of this application, the support 30 is bonded to the wall portion 2111.

[0189] For example, the support member 30 can be bonded to the wall portion 2111 by adhesive, double-sided tape or hot melt adhesive.

[0190] In this embodiment, an adhesive connection is used to connect the support member 30 and the wall portion 2111 of the outer shell 211. This facilitates assembly and reduces the difficulty of connecting the support member 30 and the wall portion 2111 of the outer shell 211. Furthermore, it ensures that the connection and assembly between the support member 30 and the wall portion 2111 of the outer shell 211 does not affect the battery cell 21, thus mitigating the phenomenon of the support member 30 damaging the battery cell 21.

[0191] According to some embodiments of this application, the elastic modulus of the material of the support member 30 is greater than or equal to 1000 MPa.

[0192] For example, the elastic modulus of the material of the support member 30 may be 1000MPa, 1010MPa, 1050MPa, 1100MPa, 1200MPa, 1300MPa, 1500MPa, 1600MPa, 1800MPa, 2000MPa, 2100MPa, 2200MPa, 2500MPa or 3000MPa, etc.

[0193] For example, the support member 30 may be made of carbon fiber, epoxy resin or polyurethane resin, etc.

[0194] In this embodiment, by setting the elastic modulus of the material of the support member 30 to be greater than or equal to 1000MPa, the support member 30 has sufficient rigidity, thereby improving the support effect of the support member 30 between the base plate 11 and the battery cell 21 when the base plate 11 is subjected to impact deformation, and also making the support member 30 have sufficient resistance to deformation, so that the support member 30 can better distribute and disperse the impact force.

[0195] According to some embodiments of this application, the support member 30 is made of insulating material.

[0196] 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 wrapped 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.

[0197] In this embodiment, by setting the support member 30 as 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.

[0198] According to some embodiments of this application, as shown in Figures 3, 5 and 6, the pressure relief mechanism 213 is disposed on the wall portion 2111, and 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.

[0199] The pressure relief mechanism 213 is disposed on the wall portion 2111, that is, the pressure relief mechanism 213 is disposed on the end of the outer shell 211 of the battery cell 21 facing the base plate 11 in the thickness direction X of the base plate. In other words, the pressure relief mechanism 213 is disposed facing the base plate 11 in the thickness direction X of the base plate.

[0200] 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. In other words, 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.

[0201] In this embodiment, by setting the pressure relief mechanism 213 and the support member 30 so that their orthogonal projections in a plane perpendicular to the thickness direction X of the base plate do not overlap, the support member 30 does not cover or obstruct the pressure relief mechanism 213 in the thickness direction X of the base plate. This reduces the obstruction and interference 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.

[0202] According to some embodiments of this application, referring to Figures 5 and 6, both the electrode terminal 212 and the pressure relief mechanism 213 are disposed on the wall portion 2111. That is, both the electrode terminal 212 and the pressure relief mechanism 213 are disposed at the end of the outer casing 211 of the battery cell 21 facing the base plate 11 in the thickness direction X of the base plate, i.e., both the electrode terminal 212 and the pressure relief mechanism 213 are disposed facing the base plate 11 in the thickness direction X of the base plate.

[0203] In this embodiment, by both the electrode terminal 212 and the pressure relief mechanism 213 are disposed on the wall portion 2111, the electrode terminal 212 and the pressure relief mechanism 213 are located at the end of the outer shell 211 of the battery cell 21 facing the base plate 11 in the thickness direction X of the base plate, which facilitates assembly and manufacturing. Furthermore, the support member 30 can simultaneously support and protect the electrode terminal 212 and the pressure relief mechanism 213.

[0204] According to some embodiments of this application, referring to Figures 2, 3, and 6, and further referring to Figure 9, which is a partial enlarged view of point B of the battery 100 shown in Figure 4. Electrode terminals 212 are disposed on the wall portion 2111. The battery 100 may also include a buffer member 60, disposed between the electrode terminals 212 and the base plate 11 along the thickness direction X of the base plate, with at least a portion of the projection of the electrode terminals 212 located within the buffer member 60.

[0205] Along the thickness direction X of the base plate, the buffer 60 is disposed between the electrode terminal 212 and the base plate 11. That is, the buffer 60 is disposed on the side of the electrode terminal 212 facing the base plate 11 in the thickness direction X of the base plate.

[0206] At least a portion of the projection of the electrode terminal 212 is located within the buffer 60, that is, the buffer 60 covers at least a portion of the electrode terminal 212 in the thickness direction X of the base plate.

[0207] In this embodiment, the battery 100 is further provided with a buffer 60. By disposing the buffer 60 between the electrode terminal 212 and the base plate 11 in the thickness direction X of the base plate, and by covering at least a portion of the electrode terminal 212 in the thickness direction X of the base plate, the buffer 60 can absorb the impact force transmitted by the base plate 11 when the base plate 11 is deformed by impact, thereby reducing the impact force acting on the electrode terminal 212. This can buffer and protect the electrode terminal 212, further reducing 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 60 can also further increase the support effect of the base plate 11 when the base plate 11 is deformed by impact, thereby further improving the deformation resistance of the base plate 11 when subjected to external impact, which is beneficial to reducing the phenomenon of impact or collision of the battery cell 21 due to the deformation of the base plate 11.

[0208] In some embodiments, referring to Figures 3 and 9, the buffer 60 covers the electrode terminal 212 along the thickness direction X of the base plate. That is, the projection of the electrode terminal 212 in the thickness direction X of the base plate is entirely located within the buffer 60.

[0209] In this embodiment, by setting the buffer 60 to cover the electrode terminal 212 in the thickness direction X of the base plate, the projection of the electrode terminal 212 in the thickness direction X of the base plate is entirely located within the buffer 60, which helps to further enhance the buffering and protection effect of the buffer 60 on the electrode terminal 212.

[0210] According to some embodiments of this application, referring to Figures 2 and 9, the battery 100 may further include a busbar 40 disposed within the housing 10. Along the thickness direction X of the base plate, the busbar 40 is connected to the end of the electrode terminal 212 facing the base plate 11 to electrically connect to the battery cell 21. Along the thickness direction X of the base plate, the first surface 31 is closer to the base plate 11 than the busbar 40, and a buffer 60 is disposed between the busbar 40 and the base plate 11.

[0211] The busbar component 40 serves to connect the electrode terminals 212 of multiple battery cells 21 in the battery cell group 20, enabling series or parallel connection between the multiple battery cells 21. For example, in Figure 2, the two electrode terminals 212 with opposite polarities in every two battery cells 21 are connected through a busbar component 40 to achieve series connection between the multiple battery cells 21. Correspondingly, the housing 10 of the battery 100 is also provided with an electrode output socket 50 for connection to the busbar component 40, so as to output or input electrical energy from the battery 100 through the electrode output socket 50.

[0212] Alternatively, the busbar component 40 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0213] 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. For example, the busbar component 40 is welded to the electrode terminal 212.

[0214] Along the thickness direction X of the base plate, the first surface 31 is closer to the base plate 11 than the busbar component 40. That is, in the thickness direction X of the base plate, the first surface 31 of the support 30 is located between the base plate 11 and the busbar component 40, so that when the base plate 11 and the first surface 31 of the support 30 are in contact or not in contact, the busbar component 40 and the base plate 11 are both spaced apart, that is, there is a distance between the busbar component 40 and the base plate 11 in the thickness direction X of the base plate.

[0215] Along the thickness direction X of the base plate, the buffer 60 is disposed between the busbar 40 and the base plate 11. That is, the buffer 60 is disposed on the side of the busbar 40 away from the electrode terminal 212 in the thickness direction X of the base plate.

[0216] 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 60 is a structure directly disposed between the electrode terminal 212 and the base plate 11, or the buffer 60 is directly connected to the end of the electrode terminal 212 facing the base plate 11.

[0217] In this embodiment, a current-combining component 40 is also provided inside the casing 10 of the battery 100. By connecting the current-combining component 40 to the electrode terminal 212, the input or output of electrical energy of the battery cell 21 can be realized. The current-combining component 40 is connected to the end of the electrode terminal 212 facing the base plate 11, and a buffer 60 is disposed between the current-combining component 40 and the base plate 11. This facilitates the assembly and connection of the current-combining component 40 and the electrode terminal 212, reducing the assembly difficulty. Furthermore, the buffer 60 also provides a certain degree of cushioning and protection for the current-combining component 40. In addition, by setting the first surface 31 to be closer to the base plate 11 than the current-combining component 40, the support 30 also provides a certain degree of support and protection for the current-combining component 40.

[0218] In some embodiments, referring to FIG9, the buffer 60 abuts against the busbar 40 and the base plate 11 on both sides along the thickness direction X of the base plate.

[0219] In this embodiment, by setting the two sides of the buffer member 60 in the thickness direction X of the base plate to abut against the busbar 40 and the base plate 11 respectively, the gap between the buffer member 60 and the base plate 11 can be reduced. On the one hand, this can improve the utilization rate of the internal space of the battery 100, which is beneficial to improving the energy density of the battery 100. On the other hand, it can improve the buffering effect of the buffer member 60 on the busbar 40 and the electrode terminal 212, and further improve the supporting effect of the buffer member 60 on the base plate 11, so as to further improve the deformation resistance of the base 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 base plate 11.

[0220] According to some embodiments of this application, referring to Figures 2, 3, and 4, the battery cell assembly 20 includes a plurality of battery cells 21, which are stacked along a first direction Y. A busbar 40 connects the electrode terminals 212 of the plurality of battery cells 21. The first direction Y is perpendicular to the thickness direction X of the base plate. A buffer 60 extends along the first direction Y and along the thickness direction X of the base plate, covering the electrode terminals 212 of the plurality of battery cells 21.

[0221] Along the thickness direction X of the base plate, the buffer 60 covers the electrode terminals 212 of multiple battery cells 21. That is, the buffer 60 is disposed between the electrode terminals 212 of multiple battery cells 21 in the battery cell group 20 and the base plate 11, and the buffer 60 can cover the electrode terminals 212 of multiple battery cells 21 in the thickness direction X of the base plate, so that multiple battery cells 21 in the battery cell group 20 can share a buffer 60.

[0222] 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 realize parallel or series connection between the plurality of battery cells 21. The structure is simple and easy to implement. In particular, by setting the buffer member 60 as a structure extending along the first direction Y, and the buffer member 60 covering the electrode terminals 212 of the plurality of battery cells 21 in the thickness direction X of the base plate, the buffer member 60 can buffer and protect the electrode terminals 212 of the plurality of battery cells 21 in the battery cell group 20. Therefore, it is not necessary to set a buffer member 60 for each electrode terminal 212 of each battery cell 21, which helps to reduce the manufacturing cost of the battery 100 and the assembly difficulty of the battery 100, thereby improving the assembly efficiency of the battery 100.

[0223] In some embodiments, referring to Figures 3, 4, 5, and 6, the battery cell 21 includes two electrode terminals 212 with opposite polarities, namely a first electrode terminal 212 and a second electrode terminal 212. The first electrode terminal 212 and the second electrode terminal 212 are spaced apart on the wall portion 2111 along a second direction Z, which is perpendicular to the thickness direction X and the first direction Y of the base plate. The battery cell group 20 is correspondingly provided with two buffer members 60, which are spaced apart along the second direction Z. Along the thickness direction X of the base plate, one buffer member 60 covers the first electrode terminals 212 of multiple battery cells 21, and the other buffer member 60 covers the second electrode terminals 212 of multiple battery cells 21.

[0224] Among them, the battery cell group 20 is provided with two buffers 60. The two buffers 60 are arranged at intervals along the second direction Z. That is, there are two buffers 60 between each battery cell group 20 and the base plate 11, and the two buffers 60 are arranged at intervals along the second direction Z.

[0225] Along the thickness direction X of the base plate, one buffer 60 covers the first electrode terminal 212 of multiple battery cells 21, and another buffer 60 covers the second electrode terminal 212 of multiple battery cells 21. That is, multiple electrode terminals 212 with the same polarity in multiple battery cells 21 of the battery cell group 20 share one buffer 60. In other words, multiple electrode terminals 212 with the same polarity in multiple battery cells 21 of the battery cell group 20 are covered by one buffer 60 in the thickness direction X of the base plate.

[0226] It should be noted that in other embodiments, each battery cell group 20 may also be provided with only one buffer 60, and the buffer 60 covers the first electrode terminal 212 and the second electrode terminal 212 of the multiple battery cells 21 of the battery cell group 20 in the thickness direction X of the base plate.

[0227] In this embodiment, each battery cell 21 is provided with a first electrode terminal 212 and a second electrode terminal 212 of opposite polarity to input or output the positive and negative terminals of the battery cell 21, respectively. Two buffers 60 are provided for each battery cell group 20, with one buffer 60 covering the first electrode terminals 212 of multiple battery cells 21 and the other buffer 60 covering the second electrode terminals 212 of multiple battery cells 21. The two buffers 60 buffer and protect the first electrode terminals 212 and the second electrode terminals 212 of the battery cells 21, respectively. The structure is simple and easy to assemble.

[0228] According to some embodiments of this application, as shown in FIG9, the buffer 60 is connected to the busbar 40.

[0229] Optionally, the connection structure between the buffer 60 and the busbar 40 can be various, such as adhesive bonding, bolting, or snap-fitting.

[0230] It should be noted that in other embodiments, the buffer 60 may also be a structure connected to the base plate 11, or a structure connected to both the base plate 11 and the busbar component 40. Of course, the buffer 60 may also be a structure located only between the base plate 11 and the busbar component 40, and not connected to either the busbar component 40 or the base plate 11.

[0231] In this embodiment, by connecting the buffer 60 to the busbar component 40, the reliability of the buffer 60 between the base plate 11 and the busbar component 40 is improved. On the one hand, it is convenient to assemble the buffer 60 between the base plate 11 and the busbar component 40, so that the buffer 60, the busbar component 40 and the battery cell assembly 20 can be assembled into a whole before being assembled into the housing 10. This helps to reduce the assembly difficulty of 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 between the base plate 11 and the busbar component 40, thereby improving the stability of the battery 100 in use.

[0232] In some embodiments, the buffer 60 is bonded to the busbar 40.

[0233] For example, the buffer 60 can be bonded to the busbar 40 with glue, double-sided tape or hot melt adhesive.

[0234] In this embodiment, the buffer 60 and the busbar component 40 are connected by an adhesive connection. This facilitates assembly and reduces the difficulty of connecting the buffer 60 and the busbar component 40. Furthermore, it ensures that the connection and assembly between the buffer 60 and the busbar component 40 does not affect the busbar component 40, thus mitigating the phenomenon of the buffer 60 damaging the busbar component 40.

[0235] According to some embodiments of this 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.

[0236] For example, 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.

[0237] For example, the material of the buffer 60 may be rubber, silicone or plastic, etc.

[0238] In this 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 therefore has a poor effect in absorbing impact force can be alleviated, and the phenomenon that the buffer 60 has a poor effect in distributing and dispersing impact force can also 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 has too high stiffness and therefore directly transmits the impact force received by the buffer 60 to the electrode terminal 212 can be alleviated, thereby improving the buffering and protection effect of the buffer 60 on the electrode terminal 212.

[0239] According to some embodiments of this application, the buffer 60 is made of insulating material.

[0240] In this embodiment, by setting the buffer 60 as an insulating material, the electrode terminals 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.

[0241] According to some embodiments of this application, referring to Figures 3 and 5, the pressure relief mechanism 213 is disposed on the wall portion 2111, and 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 buffer member 60.

[0242] Specifically, 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. 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.

[0243] In this embodiment, by setting the pressure relief mechanism 213 and the buffer 60 so that their orthogonal projections in a plane perpendicular to the thickness direction X of the base plate do not overlap, the buffer 60 does not cover or obstruct the pressure relief mechanism 213 in the thickness direction X of the base plate. This reduces the obstruction and interference of the buffer 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.

[0244] According to some embodiments of this application, referring to Figures 2, 4, and 5, the housing 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 located on both sides of the battery cell 21. The outer casing 211 is connected to the top plate 12 along the thickness direction X of the bottom plate.

[0245] The top of the housing 10 is a wall 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 located on both sides of the battery cell 21 in the thickness direction X of the bottom plate.

[0246] The outer casing 211 is connected to the top plate 12, that is, the battery cell 21 is suspended inside the box 10, so that the weight of the battery cell 21 acts on the top plate 12.

[0247] Optionally, the connection structure between the outer casing 211 of the battery cell 21 and the top plate 12 of the housing 10 can be various, such as welding, bonding or bolting.

[0248] For example, in FIG5, the shell 2112 of the outer shell 211 is connected to the top plate 12 on the bottom wall opposite to the wall portion 2111 in the thickness direction X of the bottom plate, 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.

[0249] In this embodiment, by connecting the outer shell 211 of the battery cell 21 to the top plate 12 of the housing 10, the battery cell 21 is suspended inside the housing 10. On the one hand, this reduces the load on the bottom plate 11, which is beneficial to improving the load-bearing effect of the bottom plate 11. On the other hand, it can alleviate the phenomenon that the battery cell 21 is pressed against the bottom plate 11 by the support member 30, thereby optimizing the stress on the support member 30. In this way, when the bottom plate 11 is impacted, the support member 30 can improve the support and protection effect of the battery cell 21.

[0250] In some embodiments, the housing 211 is bonded to the top plate 12.

[0251] For example, the outer casing 211 can be bonded to the top plate 12 by adhesive, double-sided tape or hot melt adhesive.

[0252] In this embodiment, an adhesive connection is used to connect the outer shell 211 of the battery cell 21 to the top plate 12 of the housing 10. On the one hand, this facilitates assembly and reduces the difficulty of connecting the outer shell 211 of the battery cell 21 to the top plate 12 of the housing 10. On the other hand, it ensures that the connection and assembly between the outer shell 211 of the battery cell 21 and the top plate 12 of the housing 10 does not affect the battery cell 21, which helps to alleviate the phenomenon of damage to the battery cell 21.

[0253] According to some embodiments of this application, referring to Figures 5, 6, and 7, the housing 211 may include a housing 2112 and an end cap 2113. The housing 2112 has an internal receiving cavity with an opening 2112a for receiving the electrode assembly 214. The opening 2112a is located at the end of the housing 2112 facing the base plate 11 in the thickness direction X of the base plate. The end cap 2113 closes the opening 2112a and is a wall portion 2111.

[0254] The end cap 2113 is a wall portion 2111, that is, at least one of the electrode terminal 212 or the pressure relief mechanism 213 is mounted on the end cap 2113, and the end cap 2113 is disposed facing the base plate 11 in the thickness direction X of the base plate.

[0255] In this embodiment, by setting the wall portion 2111 of the outer casing 211 as an end cap 2113 for closing the opening 2112a, the battery cell 21 with this structure is convenient to assemble the electrode terminal 212 or the pressure relief mechanism 213 on the end cap 2113, and can reduce the difficulty of electrically connecting the electrode terminal 212 and the electrode assembly 214, thereby reducing the manufacturing difficulty of the battery cell 21 and improving the production efficiency of the battery cell 21.

[0256] It should be noted that the structure of the battery cell 21 is not limited to this. In other embodiments, the battery cell 21 can also have other structures. For example, the housing 211 can include a shell 2112 and an end cap 2113. The shell 2112 includes an integrally formed sidewall and a wall portion 2111. The sidewall surrounds the wall portion 2111. Along the thickness direction X of the bottom plate, one end of the sidewall is connected to the wall portion 2111, and the other end forms an opening 2112a. The sidewall and the wall portion 2111 together define a receiving cavity for accommodating the electrode assembly 214. The end cap 2113 closes the opening 2112a. That is, at least one of the electrode terminal 212 or the pressure relief mechanism 213 is assembled on the bottom wall of the shell 2112, which is opposite to the end cap 2113 in the thickness direction X of the bottom plate, and the bottom wall of the shell 2112 faces the bottom plate 11 in the thickness direction X of the bottom plate.

[0257] In this embodiment, by setting the wall portion 2111 of the outer casing 211 as the bottom wall of the casing 2112 opposite to the end cap 2113 in the thickness direction of the wall portion 2111, the battery cell 21 with this structure can ensure that the area of ​​the outer casing 211 where the electrode terminals 212 or the pressure relief mechanism 213 are provided is far away from the end cap 2113. On the one hand, it can alleviate the phenomenon that the pulling or torsional force of other components on the electrode terminals 212 is directly applied to the end cap 2113, thereby reducing the risk of connection failure between the end cap 2113 and the casing 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 cap 2113 and the casing 2112 is applied to the pressure relief mechanism 213, thereby reducing the phenomenon of damage to the pressure relief mechanism 213 or premature valve opening, which is beneficial to improving the service life and reliability of the battery cell 21.

[0258] According to some embodiments of this application, this application also provides an electrical device, which includes a battery 100 of any of the above schemes, and the battery 100 is used to provide electrical energy to the electrical device.

[0259] The electrical device can be any of the aforementioned devices or systems that use battery 100.

[0260] According to some embodiments of this application, referring to Figures 2 to 9, this application provides a battery 100, which includes a housing 10, battery cell packs 20, a support member 30, a busbar member 40, and a buffer member 60. The housing 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 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 13 in the thickness direction X of the bottom plate, so that the bottom plate 11, the top plate 12, and the frame 13 together define an assembly space for accommodating the battery cell packs 20. There are multiple battery cell packs 20, and all multiple battery cell packs 20 are accommodated in the housing 10. The multiple battery cell packs 20 are arranged along the second direction Z. Each battery cell pack 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 housing 211, electrode terminals 212, a pressure relief mechanism 213, and an electrode assembly 214. The housing 211 has a wall portion 2111 and includes a shell 2112 and an end cap 2113. The interior of the shell 2112 forms a receiving cavity with an opening 2112a for accommodating the electrode assembly 214. The opening 2112a is located at the end of the shell 2112 facing the base plate 11 in the thickness direction X of the base plate. The end cap 2113 closes the opening 2112a and is part of the wall portion 2111. Along the thickness direction X of the base plate, the wall portion 2111 faces the base plate 11, and the end of the housing 211 away from the base plate 11 is bonded to the top plate 12. The electrode terminals 212 and the pressure relief mechanism 213 are both disposed on the wall portion 2111. The electrode terminals 212 are electrically connected to the electrode assembly 214, and the pressure relief mechanism 213 is configured to release the internal pressure of the battery cell 21. Each battery cell 21 includes two electrode terminals 212 with opposite polarities, namely a first electrode terminal 212 and a second electrode terminal 212. The first electrode terminal 212 and the second electrode terminal 212 are spaced apart on the wall portion 2111 along a second direction Z. A busbar component 40 connects the electrode terminals 212 of multiple battery cells 21 to electrically connect the multiple battery cells 21. 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. A support member 30 is disposed between the wall portion 2111 and the base plate 11 and is bonded to the wall portion 2111. Along the thickness direction X of the base plate, the support member 30 has a first surface 31 facing away from the wall portion 2111. The first surface 31 abuts against the base plate 11, and the first surface 31 is closer to the base plate 11 than the electrode terminals 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 portion 2111 of the outer shell 211 of the plurality of battery cells 21 in the battery cell group 20.Along the second direction Z, each pair of adjacent battery cell groups 20 shares a support member 30. The support member 30 is connected to the wall 2111 of the outer shell 211 of the battery cells 21 of the two adjacent battery cell groups 20. 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 support member 30. A cavity 32 is formed inside the support member 30, and the cavity 32 extends through both ends of the support member 30 along the first direction Y. The support member 30 is made of insulating material, and the elastic modulus of the material of the support member 30 is greater than or equal to 1000 MPa. Each battery cell group 20 is provided with two buffer members 60. The buffer members 60 are disposed between the busbar component 40 and the base plate 11, and the buffer members 60 are bonded to the side of the busbar component 40 facing the base plate 11. Along the thickness direction X of the base plate, the two sides of the buffer member 60 abut against the busbar member 40 and the base plate 11, respectively. One buffer member 60 covers the first electrode terminals 212 of multiple battery cells 21, and another buffer member 60 covers the second electrode terminals 212 of multiple battery cells 21. 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 buffer member 60. The buffer member 60 is made of insulating material, and the elastic modulus of the material of the buffer member 60 is greater than or equal to 3 MPa and less than or equal to 100 MPa.

[0261] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0262] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, comprising: The enclosure, including the base plate; A battery cell assembly is housed within the casing. The battery cell assembly includes at least one battery cell. Each battery cell includes a housing, electrode terminals, and a pressure relief mechanism. The housing has a wall portion along the thickness direction of the base plate, and the wall portion faces the base plate. Both the electrode terminals and the pressure relief mechanism are disposed within the housing, and at least one of the electrode terminals and the pressure relief mechanism is disposed within the wall portion. as well as A support member is disposed between the wall portion and the base plate and connected to the wall portion; Along the thickness direction of the base plate, the support member 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.

2. The battery according to claim 1, wherein, Along the thickness direction of the base plate, the first surface abuts against the base plate.

3. The battery according to claim 1 or 2, wherein, The battery cell assembly includes multiple battery cells, which are stacked along a first direction perpendicular to the thickness direction of the base plate. The support extends along the first direction and is connected to the wall portion of the outer casing of each of the plurality of battery cells in the battery cell group.

4. The battery according to claim 3, wherein, The battery includes a plurality of battery cell groups, which are arranged along a second direction, which is perpendicular to the thickness direction of the base plate and the first direction. Along the second direction, each pair of adjacent battery cells shares a support member, and the support member is connected to the wall portion of the outer casing of each battery cell in the two adjacent battery cell groups.

5. The battery according to claim 3 or 4, wherein, The support member has a cavity inside, and the cavity extends through both ends of the support member along the first direction.

6. The battery according to any one of claims 1-5, wherein, The support member has a cavity inside.

7. The battery according to any one of claims 1-6, wherein, The support member is bonded to the wall.

8. The battery according to any one of claims 1-7, wherein, The elastic modulus of the material of the support member is greater than or equal to 1000 MPa.

9. The battery according to any one of claims 1-8, wherein, The support component is made of insulating material.

10. The battery according to any one of claims 1-9, wherein, The pressure relief mechanism is disposed on the wall portion; In a plane perpendicular to the thickness direction of the base 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 any one of claims 1-10, wherein, Both the electrode terminals and the pressure relief mechanism are located on the wall portion.

12. The battery according to any one of claims 1-11, wherein, The electrode terminals are disposed on the wall portion; The battery further includes a buffer member, which is disposed between the electrode terminal and the base plate along the thickness direction of the base plate, and at least a portion of the projection of the electrode terminal is located within the buffer member.

13. The battery according to claim 12, wherein, Along the thickness direction of the base plate, the buffer member covers the electrode terminal.

14. The battery according to claim 12 or 13, wherein, The battery also includes: A current-combining component is disposed inside the housing and along the thickness direction of the base plate. The current-combining component is connected to the end of the electrode terminal facing the base plate to electrically connect the battery cell. Wherein, along the thickness direction of the base plate, the first surface is closer to the base plate than the busbar component, and the buffer is disposed between the busbar component and the base plate.

15. The battery according to claim 14, wherein, Along the thickness direction of the base plate, the two sides of the buffer member abut against the busbar and the base plate, respectively.

16. The battery according to claim 14 or 15, wherein, The battery cell assembly includes multiple battery cells, which are stacked along a first direction. The busbar connects the electrode terminals of the multiple battery cells, and the first direction is perpendicular to the thickness direction of the base plate. The buffer extends along the first direction and covers the electrode terminals of a plurality of battery cells along the thickness direction of the base plate.

17. The battery according to claim 16, wherein, The battery cell includes two electrode terminals with opposite polarities, namely a first electrode terminal and a second electrode terminal. The first electrode terminal and the second electrode terminal are spaced apart on the wall along a second direction, which is perpendicular to the thickness direction of the base plate and the first direction. The battery cell group is provided with two buffers, which are arranged at intervals along the second direction. Along the thickness direction of the base plate, one buffer covers the first electrode terminals of multiple battery cells, and the other buffer covers the second electrode terminals of multiple battery cells.

18. The battery according to any one of claims 14-17, wherein, The buffer is connected to the busbar component.

19. The battery according to claim 18, wherein, The buffer is bonded to the busbar component.

20. The battery according to any one of claims 12-19, wherein, 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 any one of claims 12-20, wherein, The buffer is made of insulating material.

22. The battery according to any one of claims 12-21, wherein, The pressure relief mechanism is disposed on the wall portion; In a plane perpendicular to the thickness direction of the base plate, the orthographic projection of the pressure relief mechanism does not overlap with the orthographic projection of the buffer.

23. The battery according to any one of claims 1-22, wherein, The enclosure also includes: The top plate is disposed opposite to the bottom plate along the thickness direction of the bottom plate and is located on both sides of the battery cell. The outer shell is connected to the top plate along the thickness direction of the bottom plate.

24. The battery according to claim 23, wherein, The outer shell is bonded to the top plate.

25. The battery according to any one of claims 1-24, wherein, The outer casing includes: The housing has an internally formed receiving cavity with an opening for accommodating an electrode assembly. The opening is located at one end of the housing facing the base plate in the thickness direction. End cap, to close the opening; The end cap is the wall portion.

26. The battery according to any one of claims 1-24, wherein, The outer casing includes: The housing includes an integrally formed sidewall and a wall portion, the sidewall surrounding the wall portion, one end of the sidewall being connected to the wall portion along the thickness direction of the base plate, and the other end forming an opening, the sidewall and the wall portion together defining a receiving cavity for accommodating an electrode assembly; End cap, to close the opening.

27. An electrical device comprising a battery as claimed in any one of claims 1-26, the battery being used to provide electrical energy.

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