Battery bottom support and battery

Abstract

The invention relates to a battery bottom support and a battery, the battery bottom support comprises a bottom support main body arranged between a roll core and a shell, the bottom support main body is provided with at least one open slot, and the bottom support main body is provided with at least one elastic piece arranged corresponding to the at least one open slot; the elastic piece is obliquely arranged towards the roll core, and the distance between the elastic piece and the collet main body is gradually reduced in the gravity direction; an air channel is formed in the outer wall of the side, facing the roll core, of the battery bottom support, and at least part of the end of the air channel penetrates through the side wall of the bottom support body. The elastic piece can be attached to the bottom of the roll core to form elastic support, the upwards-tilted elastic piece is flattened, and the assembly clearance is effectively eliminated. And the air passage can quickly guide air upwards, so that the air is prevented from being accumulated between the roll core and the bottom support to cause internal pressure rise of the battery, shell bulging and even potential safety hazards, and the safety and the stability of the battery are jointly guaranteed by the air passage and the bottom support.

Description

Technical Field

[0001] This application relates to the field of lithium-ion battery technology, and in particular to a battery base and a battery. Background Technology

[0002] Lithium-ion batteries mainly consist of a cover plate, aluminum casing, core, Mylar film, base plate, and connecting plates. In lithium-ion battery manufacturing, the base plate, also called the cell base or bottom support plate, is typically installed between the core and the bottom of the aluminum casing. It is a sheet-like support or protective component. Its material is mostly insulating, high-temperature resistant, and has a certain mechanical strength, such as plastic or modified composite materials. In some applications, foam or silicone is used to enhance the cushioning effect. In existing square lithium-ion battery manufacturing processes, the function of this base plate is relatively simple; its structure is usually a simple flat plate, mainly serving as insulation and basic physical isolation.

[0003] However, when using existing base plates, there is a tiny gap in the vertical direction after the core is inserted into the aluminum shell. During use, the core will repeatedly and slightly move up and down. In addition, when the battery unexpectedly thermally runs away, a large amount of gas will be released. The traditional flat base plate will obstruct the upward transmission path of the gas, thus causing the shell to bulge and deform. Summary of the Invention

[0004] This application provides a battery base and a battery, which can eliminate the gap between the core and the aluminum shell during core installation and can transfer the released gas upward in the event of battery thermal runaway.

[0005] According to one aspect of this application, a battery base is provided, including a base body;

[0006] At least one elastic element is provided on the base support body, and the base support body is disposed between the core and the shell through the elastic element;

[0007] An air passage is provided on the outer wall of the battery base facing the core, and at least part of the end of the air passage penetrates the side wall of the base body.

[0008] In one embodiment, the elastic element is configured as a spring sheet, the elastic element is inclined toward the core, and the distance between the elastic element and the base body gradually decreases along the direction of gravity;

[0009] In one embodiment, the elastic element is inclined away from the core, and the distance between the elastic element and the base body gradually increases along the direction of gravity.

[0010] In one embodiment, the base body has at least one slot corresponding to at least one of the elastic elements; in the corresponding slot and elastic element, the projection of the elastic element on the base body is located within the projection of the slot on the base body.

[0011] In one embodiment, the elastic element includes a connecting portion, through which the elastic element is connected to the base body.

[0012] In one embodiment, the base body is injection molded from an insulating material.

[0013] In one embodiment, the air passage includes a first exhaust channel formed on the base body and a second exhaust channel formed on the elastic member; at least a portion of the end of the first exhaust channel penetrates the side wall of the base body, and at least a portion of the end of the second exhaust channel communicates with the first exhaust channel.

[0014] In one embodiment, the base body has multiple slots for providing channels for the flow of electrolyte.

[0015] In one embodiment, an air passage is also provided on the outer wall of the base body facing the housing; reinforcing ribs are provided on the outer wall of the base body facing the housing.

[0016] The end of the air passage that penetrates the side wall of the base body is provided with an inclined outlet, which is used to reduce the resistance when the gas is discharged.

[0017] In one embodiment, the base body is provided with a mounting groove, and the inner wall of the housing is provided with an insert block, which is inserted into the mounting groove.

[0018] This application has the following beneficial effects:

[0019] In this invention, the elastic element and the air channel are the core structures, playing crucial roles in support and buffering, and fluid flow, respectively. The elastic element conforms to the bottom of the core to form elastic support, and when the elastic element is tilted upwards, it is flattened, thus providing a continuous, flexible, and upward axial preload to the core. This preload effectively eliminates assembly gaps and fixes the core in place, preventing it from shifting up and down. The air channel quickly guides gas upwards, preventing gas accumulation between the core and the base, which could lead to increased internal battery pressure, casing bulging, or even safety hazards. The air channel also guides the electrolyte to quickly cover the surface and gaps of the core, avoiding localized dry areas and improving battery capacity consistency and cycle life. The tilted support of the elastic element provides stable flow space for the air channel, while the fluid flow function of the air channel can promptly discharge gas and accumulated liquid around the elastic element. Together, these two aspects ensure the safety and stability of the battery. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of an embodiment of this application. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the overall three-dimensional structure of an embodiment of this application. Figure 2 .

[0022] Figure 3 This is a schematic diagram of the overall three-dimensional structure of an embodiment of this application. Figure 3 .

[0023] Figure 4 This is a cross-sectional view of a battery in one embodiment of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100. Base body; 110. Groove; 120. Elastic element; 130. Connecting part;

[0026] 140. Air passage; 141. First exhaust passage; 142. Second exhaust passage;

[0027] 150. Hole and groove. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "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 that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] See appendix Figure 1 - Appendix Figure 2 , attached Figure 1 - Appendix Figure 2 A schematic diagram of the overall structure of a battery base according to an embodiment of this application is shown, including...

[0035] Base support body 100;

[0036] At least one elastic element 120 is provided on the base support body 100, and the base support body 100 is disposed between the core and the shell through the elastic element 120;

[0037] An air passage 140 is provided on the outer wall of the battery base facing the core, and at least part of the end of the air passage 140 penetrates the side wall of the base body 100.

[0038] During operation, the elastic element 120 is tilted towards the core side, with an angle of 10°-15° between it and the horizontal plane of the base body 100, ensuring that the elastic element 120 provides uniform support after the core is assembled. A tree-like structure of longitudinal main air channels and transverse branch air channels is formed on the outer wall of the base body 100 facing the core. The main air channels are distributed along the length of the base, and the transverse branch air channels intersect with the main air channels, ensuring that there is still a flow gap when in contact with the core surface.

[0039] At least one longitudinal main air duct extends through the side wall of the base body 100. The point of penetration is designed as an inclined outlet with an angle of 45° to the side wall, which reduces gas discharge resistance and prevents electrolyte backflow. The edge of the outlet is rounded with a radius of R≥0.1mm to prevent injection molding burrs.

[0040] When the winding core is inserted into the battery casing and pressed onto the base plate, the upward-curving elastic element is flattened, providing a continuous, flexible, upward axial preload to the winding core. This preload effectively eliminates assembly gaps, fixing the winding core in place and preventing it from shifting up and down, thus protecting the tabs and solder joints from fatigue stress damage and significantly improving the battery's vibration resistance and long-term cycle life. When the base plate is placed on the flat bottom of the battery casing, the network of reinforcing ribs on its bottom surface naturally forms numerous interconnected, open gas flow channels with the bottom surface of the casing. In extreme gas generation, this network provides a wide-ranging, low-resistance evacuation path for the gas, ensuring that internal pressure is quickly and losslessly transmitted to the top explosion-proof valve, allowing it to open promptly and reliably.

[0041] See appendix Figure 1 - Appendix Figure 2 The base support body 100 has at least one slot 110 corresponding to at least one elastic member 120; in the corresponding slot 110 and elastic member 120, the projection of the elastic member 120 on the base support body 100 is located within the projection of the slot 110 on the base support body 100.

[0042] In some embodiments, the projected area of ​​the slot 110 on the base body 100 needs to be 12%-15% larger than the projected area of ​​the elastic element 120 to allow for assembly tolerances and deformation redundancy. Furthermore, the projected boundary completely encloses the projection of the elastic element 120, including the limit projection range of the elastic element 120 under maximum deformation. This ensures that the projection of the elastic element 120 does not exceed the range of the slot 110 under natural state, compression deformation, or vibration displacement.

[0043] In some embodiments, when compressed, the elastic element 120 is embedded in the slot 110, with only the arcuate convex portion protruding from the slot and used to contact the core or housing.

[0044] See appendix Figure 1 - Appendix Figure 3 The elastic element 120 is configured as a spring sheet, and the elastic element 120 is inclined toward the core. The distance between the elastic element 120 and the base body 100 gradually decreases along the direction of gravity.

[0045] In some embodiments, the elastic element 120 may also be configured as a spring, elastically connected between the core and the base support body 100, or between the base support body 100 and the housing, or other elastic structures, as long as they can elastically support the core and the housing and provide axial preload during core installation.

[0046] See appendix Figure 1 - Appendix Figure 3 The elastic element 120 is inclined away from the core, and the distance between the elastic element 120 and the base body 100 gradually increases along the direction of gravity.

[0047] In some embodiments, the elastic element 120 can also be designed to be inclined away from the core. The function of the elastic element 120 inclined away from the core is to absorb the impact force and actively clamp the core when it is displaced due to expansion or vibration by its own compression and rebound. When the core is displaced and squeezed, the elastic element 120 can disperse the force points and avoid local stress concentration that could lead to breakage of the spring sheet.

[0048] In some embodiments, the elastic element 120 is made of a modified elastic material resistant to electrolyte corrosion, such as fluororubber modified spring sheet or solvent-resistant spring steel, combined with a surface PTFE coating to improve resistance to electrolyte erosion and wear resistance. For high-power batteries, a high-temperature resistant elastic material can be selected to prevent the elastic element 120 from softening and failing due to core heating.

[0049] In some embodiments, a micro-connecting channel is formed between the slot 110 and the vent 140. When the battery unexpectedly experiences thermal runaway, a large amount of gas will be released. The electrolyte accumulation and gas in the slot 110 can flow into the vent 140 through the connecting channel and be discharged, avoiding the accumulation of pressure inside the slot 110, which could cause the casing to bulge and deform.

[0050] In some embodiments, the elastic elements 120 are arranged opposite each other to ensure that the core is subjected to stable force.

[0051] In some embodiments, the passive adaptation of the elastic element 120 may lead to insufficient initial positioning accuracy of the core. Flexible positioning protrusions made of soft silicone or foam can be added to the side of the base facing the core. The protrusions are evenly distributed along the circumference of the core. When the core is installed, the elastic compression of the protrusions achieves initial positioning, preventing the core from shaking in the housing. At the same time, the positioning protrusions are designed to be hemispherical to reduce the risk of scratching the surface of the core.

[0052] Meanwhile, anti-slip ridges are added to the side of the base that contacts the housing to increase the friction between the base and the housing, prevent the base from shifting inside the housing, and ensure the positional stability of the air passage 140 and the elastic element 120.

[0053] See appendix Figure 1 - Appendix Figure 2 The elastic element 120 includes a connecting portion 130, and the elastic element 120 is connected to the base body 100 through the connecting portion 130.

[0054] In some embodiments, the elastic element 120 is designed as an independent modular component, connected to the slot 110 via the connecting part 130. When the elastic element 120 is worn or needs to be adapted to different specifications of core, it can be quickly disassembled and replaced without replacing the entire base body 100. At the same time, multiple specifications of elastic elements 120 are provided, including elastic elements 120 with different elastic coefficients and tilt angles, to meet the adaptation requirements of different core sizes and shell gaps.

[0055] In some embodiments, the core of the lithium battery continuously expands during charging and discharging. A micro-buffer spring can be added to the base body 100 to form a double elastic layer structure. When the core expands slightly, the elastic element 120 compensates for the deformation itself. When it expands significantly, the buffer spring assists in compression, preventing the elastic element 120 from fatigue failure due to excessive compression. At the same time, a protective sleeve is fitted on the outside of the buffer spring to prevent electrolyte corrosion and impurity blockage.

[0056] In some embodiments, the connecting part 130 includes, but is not limited to, structures such as snap-fit ​​and connecting locking elements.

[0057] In some embodiments, when the connecting part 130 adopts an embedded snap-fit ​​connection design, the connecting part 130 is designed as an L-shaped snap-fit ​​structure and arranged at the root of the elastic member 120. A snap-fit ​​groove is formed at a corresponding position on the inner wall of the slot 110, with a depth of 2mm-3mm. The projections of the snap-fit ​​and the snap-fit ​​groove on the base body 100 are both within the projection of the slot 110. During assembly, the elastic member 120 is snapped into the groove by the snap-fit, and the connecting part 130 fits snugly against the wall of the slot 110 without protrusion. At the same time, the edges of the snap-fit ​​are rounded to reduce wear during assembly. During disassembly, the snap-fit ​​can be pried open through the reserved disassembly notch for easy replacement.

[0058] In some embodiments, the connection between the connecting portion 130 and the main body of the elastic element 120 adopts a circular arc transition structure with a radius of 1mm-2mm, instead of a right-angle transition. This design can avoid stress concentration in the connecting portion 130 when the elastic element 120 undergoes repeated deformation, and fatigue testing shows that the service life of the elastic element 120 can be increased by more than 30%.

[0059] In some embodiments, a 0.05 mm thick polyvinylidene fluoride coating is additionally applied to the surface of the connection portion 130. This coating is resistant to electrolytes and high temperatures, and can specifically protect this part to prevent liquid accumulation from causing corrosion failure of the connection portion 130. It is especially suitable for connection structures made of metal materials such as buckles.

[0060] In some embodiments, a silicone buffer pad with a thickness of 0.1mm-0.15mm is added to the contact surface between the connecting portion 130 and the slot 110. When the battery is subjected to vibration, the buffer pad can absorb some of the vibration energy, reduce the vibration transmission to the connecting portion 130, and prevent the connecting portion 130 from loosening due to long-term vibration. At the same time, the buffer pad can fill the assembly gap and improve the structural stability.

[0061] In some embodiments, the connecting part 130 is designed as a detachable plug-in structure, and the connecting part 130 is locked to the slot 110 by a spring-loaded latch. During disassembly, pressing the elastic button on the side wall of the slot 110 will pop out the connecting part 130 and the elastic element 120. During installation, aligning it with the positioning slot and pressing it into place will lock it in place. This design allows for tool-free replacement of the elastic element 120, and the spring-loaded latch is completely embedded within the connecting part 130.

[0062] See appendix Figure 1 - Appendix Figure 3 The base body 100 is injection molded from insulating material.

[0063] In some embodiments, the base body 100 may be made of a reinforced PBT / PC alloy. The PBT / PC alloy is a high-performance engineering plastic alloy formed by blending and modifying polybutylene terephthalate (PBT) and polycarbonate (PC). Combining the electrolyte resistance of PBT with the high toughness of PC, and with the addition of 20%-30% glass fiber reinforcement, the tensile strength can reach 80-100 MPa, and the long-term temperature resistance is 120-140℃, meeting the requirements of high-temperature battery charging and discharging scenarios. Furthermore, it has excellent insulation properties, avoiding the risk of leakage under high-voltage conditions. This material has good flowability, suitable for precision injection molding of complex air passages 140, and low molding shrinkage, ensuring the assembly accuracy of the connecting portion 130 of the elastic element 120.

[0064] In some embodiments, the base body 100 may be made of FR4 epoxy fiberglass board injection molding modified material. FR4 epoxy fiberglass board injection molding modified material is a high-performance engineering plastic that can be injection molded, based on traditional FR4 epoxy fiberglass board, i.e., epoxy resin and fiberglass cloth laminate, through crushing, modification and compounding. It is suitable for scenarios with extremely high safety and strength requirements, such as power batteries and energy storage batteries, and is especially suitable for the structural stability requirements of large-size bases.

[0065] In some embodiments, the base body 100 may be made of glass fiber reinforced PP. Glass fiber reinforced PP (polypropylene) is an enhanced engineering plastic made by adding glass fiber and modifying additives to a polypropylene (PP) substrate, followed by melt blending and granulation. This material can meet the needs of low- to mid-range consumer lithium batteries.

[0066] In some embodiments, the outer surface of the base body 100 is coated with a 0.05mm thick PTFE coating to further improve resistance to electrolyte corrosion and reduce the coefficient of friction. If heat dissipation needs to be improved, 5%-10% thermally conductive fillers, such as aluminum nitride or silicon carbide, can be added to the injection molding material to increase the thermal conductivity to 0.8W-1.2W / (mK).

[0067] See appendix Figure 1 - Appendix Figure 2 The air passage 140 includes a first exhaust passage 141 formed on the base body 100 and a second exhaust passage 142 formed on the elastic member 120; at least a portion of the end of the first exhaust passage 141 penetrates the side wall of the base body 100, and at least a portion of the end of the second exhaust passage 142 communicates with the first exhaust passage 141.

[0068] In some embodiments, the dual exhaust channel structure ensures efficient flow, with the second exhaust channel 142 integrated with the elastic element 120. The second exhaust channel 142 on the elastic element 120 adopts a single main channel or a main channel-branch channel structure. The main channel is opened along the length of the elastic element 120, with a width of 0.3mm-0.4mm and a depth of 0.2mm-0.3mm. Three to four branch channels are evenly distributed, with the same width and depth as the main channel. One end of each branch channel connects to the main channel, and the other end extends to the edge of the elastic element 120, ensuring that gas / electrolyte can quickly flow into the surface of the elastic element 120.

[0069] In some embodiments, the inner walls of the first exhaust channel 141 and the second exhaust channel 142 are polished to reduce electrolyte residue and impurity adhesion.

[0070] See appendix Figure 1 - Appendix Figure 3 The base body 100 has multiple holes and slots 150, which are used to provide channels for the flow of electrolyte.

[0071] In some embodiments, the slots 150 are evenly distributed along the base body 100, avoiding key structures such as the slot 110, and the projection of the slots 150 does not exceed the range of the base body 100. The slots 150 in the main flow area, i.e., the central area at the bottom of the core, have a higher density, while the slots 150 in the auxiliary flow area, i.e., the edge area, have a moderate density, ensuring that the electrolyte quickly covers the bottom of the core.

[0072] In some embodiments, the slot 150 adopts a conical through-hole structure with an upper diameter of 1.0mm-1.2mm and a lower diameter of 0.5mm-0.8mm. The conical design reduces the difficulty of injection molding and guides the electrolyte to converge towards the core. The inner and outer edges of the slot 150 are rounded with R≥0.2mm to prevent eddies from forming when the electrolyte flows, and to avoid injection molding burrs piercing the diaphragm or scratching the core.

[0073] In some embodiments, a small amount of flame-retardant cotton made of glass fiber reinforced PTFE can be filled into the groove 150. This does not affect the flow of electrolyte and, in the event of battery thermal runaway, inhibits the spread of flame through the groove 150. Combined with the flame-retardant material of the base body 100, this enhances safety protection.

[0074] In some embodiments, the slots 150 are arranged in an asymmetrical design, such as having more slots 150 on one side than on the other, to further prevent the slots 150 from being misaligned with the core due to the bottom bracket being installed backwards.

[0075] See appendix Figure 3 An air passage 140 is also provided on the outer wall of the battery base facing the housing; a reinforcing rib is provided on the outer wall of the base body facing the housing; an inclined outlet is provided at the end of the air passage 140 that penetrates the side wall of the base body 100, and the outlet is used to reduce the resistance when the gas is discharged.

[0076] In some embodiments, 3-4 elongated air duct grooves are formed on the outer wall of the base facing the housing. The width of the air duct grooves is 0.3mm-0.4mm and the depth is 0.2mm-0.3mm. The gas / electrolyte generated on the core side enters the first exhaust channel 141 through the second exhaust channel 142 and finally enters the housing side, or directly enters the housing side through the second exhaust channel 142. The gas in the gap between the housing and the base is transported upward through the air ducts on the housing side, realizing fluid communication between the core and both sides of the housing and avoiding local air blockage.

[0077] In some embodiments, a grid of intersecting reinforcing ribs is integrally formed on the lower surface of the base body 100, i.e. the side that contacts the bottom of the battery casing, forming a gas guiding network, and the height of the reinforcing ribs is about 0.1mm-0.6mm.

[0078] In some embodiments, the top of the reinforcing rib mesh still adopts an arc transition to avoid scratching the bottom of the housing. The reinforcing rib mesh layout avoids the projection area of ​​the internal hole groove 150 of the base body 100, that is, no ribs are provided directly below the hole groove 150 to ensure that the flow path of the electrolyte through the hole groove 150 is not affected.

[0079] In some embodiments, the lower surface is reinforced with a mesh of ribs, which increases the overall compressive strength of the structure by 30% compared to the original design. The intersection of the longitudinal main reinforcement and the transverse secondary reinforcement is designed as a circular thickened area, which is 0.1 mm higher than the reinforcement strip, to enhance the shear strength of the intersection and prevent cracking under vibration or pressure.

[0080] See appendix Figure 1 - Appendix Figure 3 The base body 100 is provided with an installation groove, and the inner wall of the housing is provided with an insertion block, which is inserted into the installation groove.

[0081] In some embodiments, the mounting slots and the insert structure are designed in a coordinated manner. Three to four mounting slots are evenly arranged along the base body 100, and the number matches the housing insert block, avoiding the housing side air passage slots and the lower surface reinforcing rib grid.

[0082] The 15°-20° chamfer at the groove opening serves as the primary guide, while a 1mm long inclined guide surface (30° angle) extends from the outside of the groove as the secondary guide, guiding the insert block to quickly align with the groove. The ends of the insert block undergo matching chamfering to further reduce the difficulty of insertion and achieve blind insertion assembly.

[0083] The mounting slots adopt an asymmetrical layout, such as one side being slightly wider by 0.2mm, or a 0.5mm thick positioning protrusion added to a certain slot. The housing insert is designed with an asymmetrical structure to forcibly limit the installation direction of the bottom support, avoiding misalignment of the gas channel and elastic element 120 due to reverse installation, thus forming a dual guarantee of insertion error prevention and bottom positioning.

[0084] This invention relates to a multifunctional integrated lithium battery base, which is manufactured using injection molding. PP polypropylene plastic is used as the raw material, and the component is formed in one injection molding process using a precisely designed mold. The overall thickness of the part is approximately 0.8 mm. Two staggered elastic members 120 are provided, each of which is separated from the base body 100 by a U-shaped slot 110, remaining connected only at its base. In its natural state, the end of the elastic member 120 is tilted upwards at an initial angle α of approximately 5-10 degrees relative to the plane of the body.

[0085] See appendix Figure 4 A battery includes a battery base 100. The battery base 100 is disposed between a core and a housing and serves to provide preload to eliminate gaps between the core and the aluminum housing, and to allow released gas to be transferred upwards in the event of battery thermal runaway.

[0086] The base is placed at the bottom of the square battery aluminum casing. The reinforcing mesh on the bottom surface of the base fits snugly against the bottom surface of the core, and the space enclosed between them forms a gas guiding channel. The core is inserted through the casing opening, and the bottom of the core presses precisely against the two elastic elements 120 on the upper surface of the base. In subsequent battery packaging processes, the weight of the core and the external pressure will flatten the elastic elements 120. Due to the elasticity of the PP material, the flattened elastic elements 120 will exert a continuous reaction force, i.e., a preload, on the bottom of the core, thereby firmly positioning the core axially and eliminating the possibility of vertical movement. In extreme cases, such as when gas is generated at a certain point at the bottom of the core, the gas will immediately enter the gas guiding channel formed by the reinforcing mesh after it bursts out, and quickly diffuse in all directions, rising along the gap between the core and the side wall of the aluminum casing, and finally being discharged through the explosion-proof valve at the top.

[0087] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery base, characterized in that, include: Base support body (100); At least one elastic element (120) is provided on the base support body (100), and the base support body (100) is disposed between the core and the shell through the elastic element (120); An air passage (140) is provided on the outer wall of the battery base facing the core, and at least part of the end of the air passage (140) penetrates the side wall of the base body (100).

2. The battery base according to claim 1, characterized in that, The elastic element (120) is configured as a spring sheet, and the (120) is inclined toward the core. The distance between the elastic element (120) and the base body (100) gradually decreases along the direction of gravity. And / or, the (120) is inclined away from the core, and the distance between the elastic element (120) and the base body (100) gradually increases along the direction of gravity.

3. The battery base according to claim 1 or 2, characterized in that, The base body (100) has at least one slot (110) corresponding to at least one of the elastic elements (120). In the corresponding slot (110) and elastic element (120), the projection of the elastic element (120) on the base body (100) is located within the projection of the slot (110) on the base body (100).

4. The battery base according to claim 1 or 2, characterized in that, The elastic element (120) includes a connecting portion (130), and the elastic element (120) is connected to the base body (100) through the connecting portion (130).

5. The battery base according to claim 1 or 2, characterized in that, The base body (100) is injection molded from insulating material.

6. The battery base according to claim 1 or 2, characterized in that, The air passage (140) includes a first exhaust passage (141) opened on the base body (100) and a second exhaust passage (142) opened on the elastic member (120). At least a portion of the end of the first exhaust channel (141) penetrates the side wall of the base body (100), and at least a portion of the end of the second exhaust channel (142) communicates with the first exhaust channel (141).

7. The battery base according to claim 1 or 2, characterized in that, The base body (100) has multiple slots (150) for providing channels for the flow of electrolyte.

8. The battery base according to claim 1 or 2, characterized in that, An air passage (140) is also provided on the outer wall of the base body (100) facing the shell. And / or, the base body (100) is provided with reinforcing ribs on the outer wall facing the housing; And / or, the end of the air passage (140) that penetrates the side wall of the base body (100) is provided with an inclined outlet, which is used to reduce the resistance when the gas is discharged.

9. The battery base according to claim 1 or 2, characterized in that, The base body (100) is provided with an installation groove, and the inner wall of the housing is provided with an insertion block, which is inserted into the installation groove.

10. A battery, characterized in that, Includes the battery base as described in any one of claims 1-9.

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