Battery cell and battery pack

Abstract

The application provides a battery monomer and a battery pack, and relates to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly arranged in the shell, an explosion-proof valve connected to the shell, and a bottom supporting plate arranged in the shell. The bottom supporting plate is located between the electrode assembly and the explosion-proof valve and comprises a plurality of base plates and at least one buffer piece. One buffer piece is connected between two adjacent base plates. The first vent hole of the base plate is arranged opposite the explosion-proof valve. The second vent hole of the buffer piece is arranged opposite and communicates with the first vent hole. A plurality of through channels are arranged on the buffer piece. The plurality of channels are arranged at intervals. Each channel communicates with the second vent hole. When the battery monomer is in thermal runaway, the first vent hole, the second vent hole and the channels can disperse the high-temperature and high-pressure gas generated in the shell to the explosion-proof valve for discharge. Through the design of the channels, the buffer piece has elastic buffering capacity, so that the bottom supporting plate can better absorb external impact force.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell and a battery pack. Background Technology

[0002] For battery cells with a bottom-outlet explosion-proof valve design, a base plate is typically installed between the electrode assembly and the explosion-proof valve. This base plate supports the electrode assembly and, in the event of thermal runaway, guides high-temperature, high-pressure gas from inside the casing through the explosion-proof valve to escape. However, under certain high-load or extreme conditions, the base plate may not effectively absorb external impacts, thus affecting the safety of the battery cell. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery cell and a battery pack, which aims to solve the technical problem that the bottom plate is difficult to absorb external impacts, thereby affecting the safety of the battery cell.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] In a first aspect, embodiments of this application provide a battery cell having a first direction and a second direction perpendicular to each other, and a third direction, and comprising:

[0006] case;

[0007] Electrode assembly, disposed within the housing;

[0008] An explosion-proof valve is connected to the housing;

[0009] A base plate is disposed within the housing and located between the electrode assembly and the explosion-proof valve. The base plate includes multiple base plates and at least one buffer member, with one buffer member connected between two adjacent base plates. A first vent hole is provided on the base plate through a third direction, and the first vent hole is disposed opposite to the explosion-proof valve. A second vent hole is provided on the buffer member through a third direction, and the second vent hole is disposed opposite to and connected to the first vent hole. A plurality of channels are provided on the buffer member through a second direction, and the plurality of channels are spaced apart along the first direction, with each channel communicating with the second vent hole.

[0010] In one embodiment of the first aspect, the buffer is provided with a plurality of first air channels spaced apart along the second direction, each of the first air channels extending along the first direction and communicating with the second vent and the plurality of channels respectively.

[0011] In one embodiment of the first aspect, the substrate is provided with a plurality of third vent holes penetrating along the third direction, the plurality of third vent holes are spaced apart along the second direction, each third vent hole extends along the first direction, each third vent hole and the first vent hole are spaced apart along the first direction, and each third vent hole and a first air guide channel are opposite to and connected to each other.

[0012] In one embodiment of the first aspect, the substrate is provided with a first positioning hole extending through the third direction, the first positioning hole and the first vent hole are spaced apart along the first direction, the buffer is provided with a second positioning hole extending through the third direction, the first positioning hole and the second positioning hole are arranged opposite to each other and connected, the buffer is provided with a second air guide channel extending along the first direction, the second air guide channel is connected to the second positioning hole, the second vent hole and at least a portion of the channels of the plurality of channels respectively.

[0013] In one embodiment of the first aspect, a third air guide channel is provided on the side of the substrate facing the buffer member. The third air guide channel extends along the first direction and is connected to the first positioning hole and the first vent hole respectively. The third air guide channel and the second air guide channel are arranged opposite to each other and are connected.

[0014] In one embodiment of the first aspect, the first vent has a plurality of first through holes extending along the first direction and at least one second through hole extending along the second direction, each second through hole communicating with two adjacent first through holes; the second vent has a plurality of third through holes extending along the first direction and at least one fourth through hole extending along the second direction, each fourth through hole communicating with two adjacent third through holes; each first through hole and each third through hole are opposite to and connected to each other, and each second through hole and each fourth through hole are opposite to and connected to each other.

[0015] In one embodiment of the first aspect, the buffer includes a plurality of arcuate plates arranged along the first direction, with adjacent arcuate plates having opposite bending directions, and each arcuate plate having one of the channels.

[0016] In one embodiment of the first aspect, the buffer includes a plurality of honeycomb structures arranged along the first direction, each of the honeycomb structures having one of the channels.

[0017] In one embodiment of the first aspect, the buffer includes a plurality of buffer modules arranged along the first direction. Each buffer module includes a partition plate, a first partition rib, a second partition rib, and a third partition rib. The first partition rib and the second partition rib are connected to one side of the partition plate, and the third partition rib is connected to the side of the partition plate opposite to the first partition rib. A channel is provided between the first partition rib and the second partition rib, and a channel is provided between the third partition ribs of two adjacent buffer modules.

[0018] In one embodiment of the first aspect, the buffer includes a plurality of slotted members and at least one connector, two adjacent slotted members are spaced apart along the first direction, the openings of two adjacent slotted members face opposite directions, one connector is connected between two adjacent slotted members, and each slotted member has one channel.

[0019] Secondly, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect above.

[0020] The beneficial effects of this application are as follows:

[0021] The battery cell provided in this application has a base plate comprising multiple substrates and at least one buffer member. A buffer member is connected between two adjacent substrates. Each substrate has a first vent hole extending in a third direction, which is positioned opposite to an explosion-proof valve. The buffer member has a second vent hole extending in a third direction, which is positioned opposite to and connected to the first vent hole. Simultaneously, the buffer member has multiple channels extending in a second direction, spaced apart in a first direction, each channel communicating with the second vent hole. Thus, when the battery cell experiences thermal runaway, the first vent hole, the second vent hole, and the channels can disperse the high-temperature, high-pressure gas generated inside the casing to the explosion-proof valve for discharge. Furthermore, the channel design provides the buffer member with a third-direction upward elastic buffering capacity, enabling the base plate to better absorb external impact forces, thereby improving the safety of the battery cell.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] 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.

[0024] Figure 1 A three-dimensional structural schematic diagram of a battery cell in one embodiment of this application is shown;

[0025] Figure 2 It shows Figure 1 A schematic diagram of the decomposed structure;

[0026] Figure 3 It shows Figure 2 A three-dimensional structural diagram of the midsole support plate;

[0027] Figure 4 It shows Figure 3 Decomposition structure diagram Figure 1 ;

[0028] Figure 5 It shows Figure 3 Decomposition structure diagram Figure 2 ;

[0029] Figure 6 It shows Figure 2 A magnified view of the midsole support plate from one angle.

[0030] Figure 7 This illustration shows a partially magnified structural diagram of the base plate of a battery cell in another embodiment of this application.

[0031] Figure 8 It shows Figure 7 A three-dimensional structural diagram of the buffer component;

[0032] Figure 9 It shows Figure 8 Enlarged structural diagram of region A in the middle;

[0033] Figure 10 It shows Figure 8 A magnified structural diagram of region B in the middle;

[0034] Figure 11 It shows Figure 8 A magnified structural diagram of region C in the middle;

[0035] Figure 12 This illustration shows a partially enlarged structural diagram of the base plate of a battery cell in another embodiment of this application.

[0036] Figure 13 This illustration shows a partially enlarged structural diagram of the base plate of a battery cell in another embodiment of this application.

[0037] Explanation of key component symbols:

[0038] 1000-Battery cell; 100-Casing; 200-End cap; 300-Terminal post; 400-Electrode assembly; 500-Explosion-proof valve; 600-Base plate; 610-Base plate; 611-First vent; 6111-First through hole; 6112-Second through hole; 612-Third vent; 613-First positioning hole; 614-Third air duct; 620-Buffer; 621-Second vent; 6211-Third through hole; 6212-Third vent; Four-way hole; 622-channel; 623-first air guide; 624-second positioning hole; 625-second air guide; 626-buffer module; 6261-honeycomb structure; 6262-partition plate; 6263-first partition rib; 6264-second partition rib; 6265-third partition rib; 6266-arc plate; 6267-slot-shaped part; 6268-connector; 700-insulating film; X-first direction; Y-second direction; Z-third direction. Detailed Implementation

[0039] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0040] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0043] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction 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.

[0044] In the description of this application, the term "and / or" indicates that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0045] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0046] Battery cells are a crucial component of power battery packs. For battery cells employing a bottom-mounted explosion-proof valve design (i.e., the explosion-proof valve is located on the side of the battery cell closest to the ground), a base plate is typically installed between the electrode assembly and the explosion-proof valve. This base plate supports the electrode assembly and, in the event of thermal runaway, guides high-temperature, high-pressure gas from the battery cell's casing through the explosion-proof valve for release. However, under certain high-load or extreme conditions, the base plate may struggle to absorb external impacts effectively, making the battery cell more susceptible to damage and compromising its safety.

[0047] like Figure 1 and Figure 2As shown, in order to solve the above-mentioned technical problems, embodiments of this application provide a battery cell 1000, which relates to the field of battery technology and is mainly used in battery packs for application in electrical devices or energy storage devices. Of course, the battery cell 1000 can also be directly applied to electrical devices or energy storage devices without using a battery pack; no specific limitations are made here regarding the application scenarios of the battery cell 1000.

[0048] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, new energy vehicles, etc., and new energy vehicles can be pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles, etc.; spacecraft can be airplanes, rockets, space shuttles, drones, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools can be metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices include energy storage containers, energy storage power stations, etc.; no specific limitations are made on the types of electrical devices and energy storage devices here.

[0049] Combination Figures 3 to 6 As shown, the battery cell 1000 provided in this embodiment has a first direction X, a second direction Y and a third direction Z that are perpendicular to each other, and includes: a housing 100, an electrode assembly 400, an explosion-proof valve 500 and a base plate 600.

[0050] The electrode assembly 400 is disposed within the housing 100; the explosion-proof valve 500 is connected to the housing 100; the base plate 600 is disposed within the housing 100 and located between the electrode assembly 400 and the explosion-proof valve 500. The base plate 600 includes multiple base plates 610 and at least one buffer member 620. One buffer member 620 is connected between two adjacent base plates 610 (i.e., one buffer member 620 is connected between every two adjacent base plates 610). The base plate 610 is provided with a first vent hole 611 penetrating in the third direction Z. The first vent hole 611 and the explosion-proof valve 500 are disposed opposite to each other. The buffer member 620 is provided with a second vent hole 621 penetrating in the third direction Z. The second vent hole 621 and the first vent hole 611 are disposed opposite to each other and connected. The buffer member 620 is provided with multiple channels 622 penetrating in the second direction Y. The multiple channels 622 are spaced apart in the first direction X. Each channel 622 is connected to the second vent hole 621. It should be noted that "the substrate 610 is provided with a first vent 611 penetrating along the third direction Z, the buffer member 620 is provided with a second vent 621 penetrating along the third direction Z, and the buffer member 620 is provided with a plurality of channels 622 penetrating along the second direction Y" means that: the first vent 611 penetrates the substrate 610 along the third direction Z, the second vent 621 penetrates the buffer member 620 along the third direction Z, and each channel 622 penetrates the buffer member 620 along the second direction Y.

[0051] It is understood that the battery cell 1000 provided in this embodiment includes a base plate 600 comprising multiple base plates 610 and at least one buffer member 620. A buffer member 620 is connected between two adjacent base plates 610. The base plate 610 is provided with a first vent hole 611 extending through it in a third direction Z. The first vent hole 611 and the explosion-proof valve 500 are disposed opposite to each other. The buffer member 620 is provided with a second vent hole 621 extending through it in a third direction Z. The second vent hole 621 and the first vent hole 611 are disposed opposite to each other and connected. At the same time, the buffer member 620 is provided with multiple channels 622 extending through it in a second direction Y. The multiple channels 622 are spaced apart in a first direction X. Each channel 622 is connected to the second vent hole 621. In this way, when the battery cell 1000 experiences thermal runaway, the first through hole 6111, the second through hole 6112, and the channel 622 can disperse the high-temperature and high-pressure gas generated inside the casing 100 to the explosion-proof valve 500 for discharge. Furthermore, through the design of the channel 622, the buffer 620 has an elastic buffering capacity in the third direction Z, so that the bottom support plate 600 can better absorb external impact forces, thereby improving the safety of the battery cell 1000.

[0052] It should be noted that the substrate 610 and the buffer 620 may be made of the same material or different materials. For example, the material of the substrate 610 and / or the material of the buffer 620 may be one of polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), carbon fiber, aluminum alloy, etc. No specific limitation is made on the material of the substrate 610 and the buffer 620 here.

[0053] Furthermore, when the substrate 610 is made of metal, such as Figure 2 As shown, insulation between the substrate 610 and the electrode assembly 400 can be achieved by an insulating film 700 wrapped around the electrode assembly 400, or by coating an insulating coating on the side of the substrate 610 facing the electrode assembly 400. The material of the insulating film 700 and / or the material of the insulating coating can be one of polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), etc., and no specific limitation is made here.

[0054] For example, there are two substrates 610 and one buffer 620; of course, there may also be three substrates 610 and two buffers 620, or four substrates 610 and three buffers 620. The number of substrates 610 and buffers 620 is not specifically limited here.

[0055] like Figure 4 and Figure 5 As shown, in one embodiment, the buffer 620 is provided with a plurality of first air channels 623 spaced apart along the second direction Y. Each first air channel 623 extends along the first direction X and is connected to a second vent 621 and a plurality of channels 622 respectively.

[0056] Understandably, since the buffer 620 is provided with a plurality of first air channels 623 spaced apart along the second direction Y, and each first air channel 623 extends along the first direction X, each first air channel 623 is connected to a second vent 621 and a plurality of channels 622 respectively, that is, each first air channel 623 is connected to a plurality of channels 622, and each first air channel 623 is also connected to the second vent 621, that is, each channel 622 is indirectly connected to the second vent 621 through the first air channel 623. In this way, it is convenient to disperse all the high temperature and high pressure gas flowing through the plurality of channels 622 to the second vent 621, and then disperse it to the explosion-proof valve 500 through the first vent 611 on the substrate 610 near the explosion-proof valve 500, thereby improving the exhaust performance of the battery cell 1000.

[0057] Of course, in the above embodiments, each channel 622 can also be directly connected to the second vent 621. For example, each channel 622 extends to the second vent 621 along the second direction Y. Here, no specific limitation is made on the way the channel 622 is connected to the second vent 621.

[0058] like Figure 4 and Figure 5 As shown, the substrate 610 is further provided with a plurality of third vent holes 612 extending through the third direction Z. The plurality of third vent holes 612 are spaced apart along the second direction Y. Each third vent hole 612 extends along the first direction X. Each third vent hole 612 and a first vent hole 611 are spaced apart along the first direction X. Each third vent hole 612 and a first air guide channel 623 are opposite to each other and connected.

[0059] It should be noted that "each third vent 612 and a first vent 623 are arranged opposite to each other and connected" can be understood as: each third vent 612 corresponds to one first vent 623. It can be understood that by setting multiple third vents 612, the exhaust area of ​​the substrate 610 is increased. When the battery cell 1000 experiences thermal runaway, the high-temperature and high-pressure gas flowing through the third vent 612 is dispersed to the second vent 621 through the first vent 623, and then dispersed to the explosion-proof valve 500 through the first vent 611 on the substrate 610 near the explosion-proof valve 500, thereby improving the exhaust performance of the battery cell 1000.

[0060] like Figure 5 as well as Figures 8 to 10 As shown, in one embodiment, the substrate 610 is provided with a first positioning hole 613 extending through the third direction Z, the first positioning hole 613 and the first vent hole 611 are arranged at intervals along the first direction X, the buffer member 620 is provided with a second positioning hole 624 extending through the third direction Z, the first positioning hole 613 and the second positioning hole 624 are arranged opposite to each other and connected, the buffer member 620 is provided with a second air guide channel 625 extending along the first direction X, the second air guide channel 625 is connected to the second positioning hole 624, the second vent hole 621 and at least a portion of the multiple channels 622.

[0061] It is understandable that by providing a first positioning hole 613 on the substrate 610 and a second positioning hole 624 on the buffer member 620, with the first positioning hole 613 being opposite to and communicating with each other, it facilitates the connection between the bottom support plate 600 and the buffer member 620. Figure 2The assembly shown is between the insulating films 700 surrounding the electrode assembly 400. Based on this, a second air duct 625 extending along the first direction X is provided on the buffer 620. The second air duct 625 is connected to the second positioning hole 624, the second vent hole 621 and at least some of the channels 622, respectively. This facilitates the dispersion of high-temperature and high-pressure gas flowing through the first positioning hole 613 and the second positioning hole 624 to the second vent hole 621, and then to the explosion-proof valve 500 through the first vent hole 611 on the substrate 610 near the explosion-proof valve 500, thereby improving the exhaust performance of the battery cell 1000.

[0062] like Figure 5 As shown, the substrate 610 is further provided with a third air guide channel 614 on the side facing the buffer member 620. The third air guide channel 614 extends along the first direction X and is connected to the first positioning hole 613 and the first vent hole 611 respectively. The third air guide channel 614 and the second air guide channel 625 are arranged opposite to each other and connected.

[0063] It is understandable that by providing a third air guide channel 614 on the substrate 610, the third air guide channel 614 extends along the first direction X and is connected to the first positioning hole 613 and the first vent hole 611 respectively. The third air guide channel 614 and the second air guide channel 625 are arranged opposite to each other and connected. This can more efficiently disperse the high temperature and high pressure gas flowing through the first positioning hole 613 and the second positioning hole 624. At the same time, the third air guide channel 614 is formed on the side of the substrate 610 facing the buffer member 620, which can reduce the possibility of high temperature and high pressure gas diffusing along the direction close to the electrode assembly 400 in the third direction Z, thereby improving the exhaust performance of the battery cell 1000.

[0064] like Figure 3 and Figure 4 As shown, in one embodiment, the first vent 611 has a plurality of first through holes 6111 extending along a first direction X and at least one second through hole 6112 extending along a second direction Y. Each second through hole 6112 is connected to two adjacent first through holes 6111. The second vent 621 has a plurality of third through holes 6211 extending along the first direction X and at least one fourth through hole 6212 extending along the second direction Y. Each fourth through hole 6212 is connected to two adjacent third through holes 6211. Each first through hole 6111 and a third through hole 6211 are arranged opposite to each other and connected. Each second through hole 6112 and a fourth through hole 6212 are arranged opposite to each other and connected.

[0065] For example, there are two first through holes 6111 and three third through holes 6211, and one second through hole 6112 and one fourth through hole 6212. Of course, there can also be three first through holes 6111 and three third through holes 6211, two second through holes 6112 and two fourth through holes 6212, or four first through holes 6111 and three second through holes 6112 and three fourth through holes 6212. No specific limitation is made here.

[0066] Understandably, based on the above structural design, two adjacent first through holes 6111 and one second through hole 6112 form an I-shaped vent, and two adjacent third through holes 6211 and one fourth through hole 6212 form another I-shaped vent. In this way, when the battery cell 1000 experiences thermal runaway, the area of ​​the bottom plate 600 with the first vent 611 and the second vent 621 will be lifted open under the internal pressure of the housing 100, thereby dispersing a large amount of high-temperature and high-pressure gas to the explosion-proof valve 500 for discharge, thus improving the venting performance of the battery cell 1000.

[0067] like Figure 5 and Figure 6 As shown, in one embodiment, the buffer 620 includes a plurality of buffer modules 626 arranged along a first direction X, each buffer module 626 being an arc-shaped plate 6266, with adjacent arc-shaped plates 6266 having opposite bending directions, and each arc-shaped plate 6266 having a channel 622.

[0068] It is understandable that since the buffer 620 includes a plurality of arc-shaped plates 6266 arranged along the first direction X, each arc-shaped plate 6266 has a channel 622, and the bending directions of two adjacent arc-shaped plates 6266 are opposite, the buffer 620 is wavy. The wavy buffer 620 has a greater amount of compression in the third direction Z, thus having a better buffering effect.

[0069] like Figure 7 , Figure 8 and Figure 11 As shown, in another embodiment, the buffer 620 includes a plurality of buffer modules 626 arranged along a first direction X, each buffer module 626 being a honeycomb structure 6261, and each honeycomb structure 6261 having a channel 622.

[0070] It is understandable that, since the buffer 620 includes a plurality of honeycomb structures 6261 arranged along the first direction X, each honeycomb structure 6261 has a channel 622, the honeycomb structure 6261 has a unique hexagonal geometry (which can be a regular hexagon with equal side lengths and equal interior angles, or an irregular hexagon, without specific limitations here), it can more effectively absorb and disperse external impact forces, while also providing high strength and stiffness, that is, it has both high buffering performance and high strength and stiffness.

[0071] like Figure 5 and Figure 12 As shown, in another embodiment, the buffer 620 includes a plurality of buffer modules 626 arranged along a first direction X. Each buffer module 626 includes a partition plate 6262, a first partition rib 6263, a second partition rib 6264, and a third partition rib 6265. The first partition rib 6263 and the second partition rib 6264 are connected to one side of the partition plate 6262, and the third partition rib 6265 is connected to the side of the partition plate 6262 opposite to the first partition rib 6263. A channel 622 is provided between the first partition rib 6263 and the second partition rib 6264, and a channel 622 is provided between the third partition ribs 6265 of two adjacent buffer modules 626.

[0072] It is understandable that the buffer 620 formed based on the above structural design has multiple rectangular channels 622. The buffer 620 with rectangular channels 622 has higher strength and rigidity and can better support the electrode assembly 400.

[0073] like Figure 5 and Figure 13 As shown, in another embodiment, the buffer 620 includes a plurality of buffer modules 626 arranged along a first direction X. Each buffer module 626 includes a plurality of slotted members 6267 and at least one connector 6268. Adjacent slotted members 6267 are spaced apart along the first direction X, and the openings of adjacent slotted members 6267 face opposite directions. A connector 6268 is connected between adjacent slotted members 6267 (i.e., a connector 6268 is connected between every two adjacent slotted members 6267). Each slotted member 6267 has a channel 622.

[0074] It is understandable that the buffer 620 formed based on the above structure design has multiple U-shaped channels 622. The buffer 620 with U-shaped channels 622 can more effectively absorb and disperse external impact forces, while also providing high strength and stiffness, that is, it has both high buffering performance and high strength and stiffness.

[0075] like Figure 1 and Figure 2As shown, in one embodiment, the battery cell 1000 further includes a terminal post 300 and an end cap 200. The end cap 200 is connected to the housing 100 and is located on one side of the housing 100 along the third direction Z. The explosion-proof valve 500 is located on the other side of the housing 100 along the third direction Z. The terminal post 300 passes through the end cap 200 and is electrically connected to the electrode assembly 400. In this way, the terminal post 300 and the explosion-proof valve 500 are far apart from each other in the third direction Z, realizing thermoelectric separation. That is, when the explosion-proof valve 500 opens to discharge high-temperature and high-pressure gas, it is not easy to affect the terminal post 300, thereby improving the safety of the battery cell 1000.

[0076] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including the battery cell 1000 from any of the above embodiments.

[0077] It is understood that since the battery pack provided in this embodiment has the battery cell 1000 in any of the above embodiments, it has all the beneficial effects of the battery cell 1000, which will not be described in detail here.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery cell, characterized in that, It has a first direction (X) and a second direction (Y) that are mutually perpendicular to each other, and a third direction (Z), and includes: Casing (100); An electrode assembly (400) is disposed within the housing (100); An explosion-proof valve (500) is connected to the housing (100); A base plate (600) is disposed within the housing (100) and located between the electrode assembly (400) and the explosion-proof valve (500). The base plate (600) includes a plurality of base plates (610) and at least one buffer member (620), with one buffer member (620) connected between two adjacent base plates (610). A first vent hole (611) is provided on the base plate (610) extending along the third direction (Z). The first vent hole (611) and the explosion-proof valve (500) The buffer (620) is provided with a second vent (621) that runs through the third direction (Z). The second vent (621) and the first vent (611) are provided with each other and connected. The buffer (620) is provided with a plurality of channels (622) that run through the second direction (Y). The plurality of channels (622) are spaced apart along the first direction (X). Each channel (622) is connected to the second vent (621).

2. The battery cell according to claim 1, characterized in that, The buffer (620) is provided with a plurality of first air channels (623) spaced apart along the second direction (Y). Each first air channel (623) extends along the first direction (X) and is connected to the second vent (621) and the plurality of channels (622).

3. The battery cell according to claim 2, characterized in that, The substrate (610) is provided with a plurality of third vent holes (612) extending through the third direction (Z). The plurality of third vent holes (612) are spaced apart along the second direction (Y). Each third vent hole (612) extends along the first direction (X). Each third vent hole (612) and the first vent hole (611) are spaced apart along the first direction (X). Each third vent hole (612) is opposite to and connected to a first air guide channel (623).

4. The battery cell according to claim 1, characterized in that, The substrate (610) is provided with a first positioning hole (613) extending through the third direction (Z), the first positioning hole (613) and the first vent hole (611) are spaced apart along the first direction (X), the buffer (620) is provided with a second positioning hole (624) extending through the third direction (Z), the first positioning hole (613) and the second positioning hole (624) are arranged opposite to each other and connected, the buffer (620) is provided with a second air guide channel (625) extending along the first direction (X), the second air guide channel (625) is connected to the second positioning hole (624), the second vent hole (621) and at least a portion of the channels (622) of the plurality of channels (622).

5. The battery cell according to claim 4, characterized in that, The substrate (610) is provided with a third air guide channel (614) on the side facing the buffer (620). The third air guide channel (614) extends along the first direction (X). The third air guide channel (614) is connected to the first positioning hole (613) and the first vent hole (611) respectively. The third air guide channel (614) and the second air guide channel (625) are arranged opposite to each other and connected.

6. The battery cell according to any one of claims 1 to 5, characterized in that, The first vent (611) has a plurality of first through holes (6111) extending along the first direction (X) and at least one second through hole (6112) extending along the second direction (Y). Each second through hole (6112) is connected to two adjacent first through holes (6111). The second vent (621) has a plurality of third through holes (6211) extending along the first direction (X) and at least one fourth through hole (6212) extending along the second direction (Y). Each fourth through hole (6212) is connected to two adjacent third through holes (6211). Each first through hole (6111) and a third through hole (6211) are arranged opposite to each other and connected. Each second through hole (6112) and a fourth through hole (6212) are arranged opposite to each other and connected.

7. The battery cell according to any one of claims 1 to 5, characterized in that, The buffer (620) includes a plurality of arc-shaped plates (6266) arranged along the first direction (X), with adjacent arc-shaped plates (6266) having opposite bending directions, and each arc-shaped plate (6266) having a channel (622).

8. The battery cell according to any one of claims 1 to 5, characterized in that, The buffer (620) includes a plurality of honeycomb structures (6261) arranged along the first direction (X), each of the honeycomb structures (6261) having one of the channels (622).

9. The battery cell according to any one of claims 1 to 5, characterized in that, The buffer (620) includes a plurality of buffer modules (626) arranged along the first direction (X). Each buffer module (626) includes a partition plate (6262), a first partition rib (6263), a second partition rib (6264), and a third partition rib (6265). The first partition rib (6263) and the second partition rib (6264) are connected to one side of the partition plate (6262), and the third partition rib (6265) is connected to the side of the partition plate (6262) opposite to the first partition rib (6263). There is a channel (622) between the first partition rib (6263) and the second partition rib (6264), and there is a channel (622) between the third partition ribs (6265) of two adjacent buffer modules (626).

10. The battery cell according to any one of claims 1 to 5, characterized in that, The buffer (620) includes a plurality of slotted parts (6267) and at least one connector (6268), with two adjacent slotted parts (6267) spaced apart along the first direction (X), the openings of two adjacent slotted parts (6267) facing opposite directions, and one connector (6268) connecting two adjacent slotted parts (6267), each slotted part (6267) having one channel (622).

11. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1 to 10.

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