Lower plastic, battery, battery module and power consumption device

Abstract

The present application relates to a battery, a battery module and a power consuming device. The lower plastic 10 includes a plastic body, the lower plastic body having a first side 1 and a second side 2 arranged opposite to the first side 1, a buffer groove 11 is formed in the first side 1, and a connecting piece groove 21 is formed in the second side 2, the lower plastic satisfies at least one of condition 1 and condition 2, in condition 1, 1mm≦ce≦2mm, 1mm≦cf≦2mm, where c is the thickness of the lower plastic body, f is the depth of the buffer groove 11, and e is the depth of the connecting piece groove 21, and in condition 2, 1mm≦p≦2mm, p=(at*gr*d) / n, where g is the length of the connecting piece groove 21, t is the number of the connecting piece grooves 21, r is the number of the buffer grooves 11, d is the length of the buffer groove 11, a is the length of the lower plastic body, and p is the thickness of each of the n side walls arranged along the longitudinal direction of the lower plastic body.

Description

[Technical Field]

[0001] This invention claims priority to and benefits from a Chinese patent application with patent application number 2022111856392, filed with the State Intellectual Property Office of the People's Republic of China on September 27, 2022, the entire text of which is incorporated herein by reference.

[0002] The present invention relates to the technical field of batteries, and in particular to plastics, batteries, battery modules and power consuming devices. [Background technology]

[0003] Currently, large-sized lower plastic structures often increase their thickness to strengthen the strength of the lower plastic, but increasing the thickness of the lower plastic often requires more lower plastic material, which increases production costs. Summary of the Invention

[0004] The present invention provides a lower plastic, a battery, a battery module and a power consuming device.

[0005] The lower plastic according to an embodiment of the present invention is a lower plastic body, the lower plastic body comprising: The first aspect and a second side surface disposed opposite to the first side surface, The first side surface has a buffer groove recessed toward the second side surface, and the buffer groove has at least one flow guide hole penetrating the lower plastic body in the thickness direction. The second side surface has a connecting piece groove recessed toward the first side surface, and the connecting piece groove has a pole through-hole penetrating the lower plastic body in the thickness direction. The lower plastic body satisfies at least one of conditions 1 and 2. In the condition 1, 1 mm≦ce≦2 mm, 1 mm≦cf≦2 mm, where c is the thickness of the lower plastic body, f is the depth of the buffer groove, and e is the depth of the connecting piece groove; In the above condition 2, 1 mm≦p≦2 mm, p=(at*gr*d) / n, where g is the length of the connecting piece groove, t is the number of the connecting piece grooves, r is the number of the buffer grooves, d is the length of the buffer groove, a is the length of the lower plastic body, and p is the thickness of each of the n side walls arranged along the longitudinal direction of the lower plastic body.

[0006] According to the lower plastic of the embodiment of the present invention, a buffer groove is opened on the first side of the lower plastic body, and a connecting piece groove is opened on the second side, thereby reducing the amount of material used in the lower plastic and saving costs, and at least one of conditions 1 and 2 can ensure the possibility of injection molding.

[0007] According to some embodiments of the present invention, the projection areas of the connecting piece groove and the buffer groove on the lower plastic body are offset from each other.

[0008] According to some embodiments of the present invention, there are two connecting piece grooves, one buffer groove, and the two connecting piece grooves are located at both ends of the buffer groove, respectively, so that t=2, r=1, and n=4.

[0009] According to some embodiments of the present invention, the first side and the second side are connected via an outer peripheral surface, and a notch groove is provided on the second side, and the notch groove has an outer peripheral groove wall spaced apart from the outer peripheral surface and a groove bottom wall in which the connecting piece groove is opened.

[0010] According to some embodiments of the present invention, a positioning protrusion is provided within the connecting piece groove, the positioning protrusion protruding away from the first side surface, and the end face of the positioning protrusion is flush with the bottom wall of the notch groove.

[0011] According to some embodiments of the present invention, the lower plastic body has a flat structure, the length of the lower plastic body is 300 mm or more, the width of the lower plastic body is 100 mm or more, and the thickness of the lower plastic body is 4 mm or more.

[0012] According to some embodiments of the present invention, the thickness of the lower plastic body is less than or equal to 30 mm.

[0013] According to some embodiments of the present invention, the length of the buffer groove is 285 mm or more, the width of the buffer groove is 96 mm or more, and the depth of the buffer groove is 2.5 mm or more.

[0014] According to some embodiments of the present invention, the dimension of the connecting piece groove in the longitudinal direction of the lower plastic body is 50 mm or more, the dimension of the connecting piece groove in the width direction of the lower plastic body is 86 mm or more, and the depth of the connecting piece groove is 2.5 mm or more.

[0015] According to some embodiments of the present invention, the corner of the connecting piece groove close to the buffer groove is a fillet, and the fillet radius of the fillet is 5 mm to 20 mm.

[0016] According to some embodiments of the present invention, the pole post through-hole is located at the center of the lower plastic body in the width direction of the lower plastic body.

[0017] According to some embodiments of the present invention, the n side walls include a first side wall which is a side wall of the connecting piece groove that is away from the buffer groove and a second side wall which is a side wall of the connecting piece groove that is closer to the buffer groove, and the distance between the pole post through hole and the first side wall is greater than the distance between the pole post through hole and the second side wall.

[0018] A battery according to another embodiment of the present invention includes the lower plastic described in any of the above embodiments.

[0019] According to some embodiments of the present invention, the battery further includes a cover plate located on the first side of the lower plastic, the cover plate having a liquid inlet, the projection of the liquid inlet on the first side being located within the buffer groove, and the flow guide hole being offset from the liquid inlet.

[0020] According to some embodiments of the present invention, the battery further includes a connecting piece located on the second side of the lower plastic and a pole that is installed through the pole through-hole, the connecting piece including a connected pole connecting segment and a pole lug connecting segment, the pole connecting segment being located in the connecting piece groove and fixedly connected to the pole, the pole lug connecting segment extending in a direction away from the lower plastic, and the included angle between the pole lug connecting segment and the pole connecting segment being 70° to 110°.

[0021] According to some embodiments of the present invention, the battery further includes at least one bare cell, the bare cell being arranged on the side of the pole post connecting segment away from the lower plastic, the vertical extension direction of the bare cell being consistent with the longitudinal direction of the lower plastic body, and the vertical end of the bare cell being a pole ear, which is connected to the pole ear connecting segment.

[0022] According to some embodiments of the present invention, the bare cell has a protrusion protruding toward the lower plastic, the protrusion including a proximal portion and a distal portion, the distance between the proximal portion and the lower plastic being shortest, the distance between the distal portion and the lower plastic being greater than the distance between the proximal portion and the lower plastic, and the projection of the flow guide hole on the protrusion is located on the distal portion or the flow guide hole is offset from the protrusion.

[0023] According to some embodiments of the present invention, the buffer groove is provided with a plurality of flow guide holes penetrating the lower plastic body along the thickness direction, and the flow guide holes are provided on both sides of the proximal portion.

[0024] According to some embodiments of the present invention, the battery includes a plurality of bare cells, and the flow guide hole is located at the midline between two adjacent bare cells.

[0025] A battery module according to another embodiment of the present invention includes a battery according to any of the above embodiments.

[0026] A power consumption device according to another embodiment of the present invention includes the battery module described in the above embodiment.

[0027] According to the battery, battery module, and power consumption device of the embodiments of the present invention, a buffer groove is provided on the first side of the lower plastic body, and a connecting piece groove is provided on the second side, thereby reducing the amount of material used in the lower plastic body and saving costs, and at least one of conditions 1 and 2 ensures the feasibility of injection molding.

[0028] Additional aspects and advantages of the present invention will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and easier to understand from the following description of the embodiments taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a schematic perspective view of a lower plastic according to an embodiment of the present invention from one viewpoint. [Figure 2] FIG. 10 is a schematic perspective view of a lower plastic according to an embodiment of the present invention from another viewpoint. [Figure 3]FIG. 2 is a plan view of a bottom plastic according to an embodiment of the present invention. [Figure 4] 4 is a cross-sectional view taken along the line AA in FIG. 3. [Figure 5] 4 is a schematic view showing the thickness of the lower plastic body, the depth of the buffer groove and the depth of the connecting piece groove; FIG. [Figure 6] FIG. 2 is a bottom view of a lower plastic according to an embodiment of the present invention. [Figure 7] 1 is a schematic diagram of a notched groove in a lower plastic according to an embodiment of the present invention; [Figure 8] FIG. 10 is a bottom view of a lower plastic according to another embodiment of the present invention. [Figure 9] FIG. [Figure 10] FIG. 1 is a schematic assembly diagram of the cover plate, lower plastic, connecting piece, and bare cell. [Figure 11] FIG. 10 is a schematic diagram showing the relative positions of the bare cell and the lower plastic. DETAILED DESCRIPTION OF THE INVENTION

[0031]

[0023] In the following, the embodiments of the present invention will be described in detail, as shown in the accompanying drawings, in which the same or similar reference numerals throughout indicate the same or similar elements, or elements having the same or similar functions. The embodiments described below with reference to the drawings are exemplary intended to explain the present invention, and are not to be understood as limiting the present invention.

[0032] In describing the present invention, the orientations or positional relationships indicated by terms such as "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are orientations or positional relationships shown based on the drawings, and are intended only to facilitate and simplify the description of the present invention, and do not indicate or imply that the referred-to devices or elements must have a particular orientation, be configured, or operate in a particular orientation, and therefore cannot be understood as limiting the present invention.

[0033] Additionally, "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or as implicitly designating the number of technical features. Thus, features qualified by "first" and "second" can explicitly or implicitly include one or more of such features. In describing the present invention, "plurality" means at least two, e.g., two, three, unless otherwise clearly and specifically limited.

[0034] In the present invention, unless otherwise expressly specified or limited, the terms "attached," "connected," "coupled," and "fixed" should be generally understood, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection or communication with each other, a direct connection or an indirect connection via an intermediate medium, or internal communication between two elements or interaction between two elements. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0035] A bottom plastic 10 according to an embodiment of the present invention will be described in detail below with reference to Figures 1 to 11. The bottom plastic 10 can be used in a battery, the battery including a case and a battery top cover, the case having an accommodation space within which a cell is provided, the battery top cover being used to cover an opening of the accommodation space, and in some embodiments, the bottom plastic 10 can be formed as a part of the battery top cover.

[0036] 1 to 6, a lower plastic 10 according to an embodiment of the present invention includes a lower plastic body, which has a first side surface 1 and a second side surface 2, and the first side surface 1 and the second side surface 2 are arranged back to back. Specifically, in FIG. 1, the upper surface of the lower plastic body is the first side surface 1, and the lower surface of the lower plastic body is the second side surface 2.

[0037] The first side surface 1 has a buffer groove 11 recessed toward the second side surface 2. As shown in FIG. 1, the buffer groove 11 is recessed downward. The buffer groove 11 has at least one flow guide hole 12 penetrating the lower plastic body in the thickness direction. When the lower plastic body 10 is used in a battery, the electrolyte can be completely injected into the battery through the flow guide hole 12. The buffer groove 11 functions as a buffer area for the electrolyte, effectively preventing excessive injection pressure from damaging the bare cell inside the battery case and balancing the air pressure inside the cell. The recessed structure of the buffer groove 11 also somewhat enhances the mechanical strength of the electrolyte injection area of ​​the lower plastic body.

[0038] In some embodiments of the present invention, the number of the flow guide holes 12 is one, which is advantageous for simplifying the processing process of the lower plastic 10, and it is easy to manage the injection process when the number of the flow guide holes 12 is small.

[0039] In some embodiments of the present invention, the number of the flow guide holes 12 is plural, which is advantageous for improving the efficiency of injection.

[0040] The second side surface 2 is provided with a connecting piece groove 21 recessed toward the first side surface 1, and when the lower plastic body 10 is applied to a battery, the connecting piece can be at least partially mounted and positioned within the connecting piece groove 21, which is advantageous for reducing the overall thickness after connection between the connecting piece and the lower plastic body 10. Furthermore, the recessed structure of the connecting piece groove 21 somewhat enhances the mechanical strength of the connecting piece region of the lower plastic body.

[0041] In some embodiments of the present invention, the bottom plastic 10 satisfies at least one of the following conditions:

[0042] Condition 1: 1 mm≦ce≦2 mm, 1 mm≦cf≦2 mm, where c is the thickness of the lower plastic body, f is the depth of the buffer groove 11, and e is the depth of the connecting piece groove 21.

[0043] Condition 2: 1 mm≦p≦2 mm, p=(at*gr*d) / n, where g is the length of the connecting piece groove 21, t is the number of connecting piece grooves 21, r is the number of buffer grooves 11, d is the length of the buffer groove 11, a is the length of the lower plastic body, and p is the thickness of each of the n side walls arranged along the longitudinal direction of the lower plastic body.

[0044] The lower plastic body 10 of the above embodiment has a buffer groove 11 on the first side 1 of the lower plastic body and a connecting piece groove 21 on the second side 2, thereby reducing the amount of material used in the lower plastic body 10 and saving costs. At least one of Condition 1 and Condition 2 ensures the feasibility of injection molding.

[0045] Specifically, the lower plastic 10 is generally manufactured using an injection molding process, which has poor molding efficiency for injection-molded parts with a thickness greater than 2 mm, and the vertical space occupied by the lower plastic is large, which increases the weight of the battery and reduces the energy density of the battery. When the thickness is less than 1 mm, the strength of the injection-molded part cannot meet the requirements.

[0046] In Condition 1, 1 mm≦ce≦2 mm indicates the distance between the bottom surface of connecting piece groove 21 and first side surface 1, i.e., the thickness of the lower plastic body at connecting piece groove 21. 1 mm≦cf≦2 mm indicates the distance between the bottom surface of buffering groove 11 and second side surface 2, i.e., the thickness of the lower plastic body at buffering groove 11. On the one hand, this ensures the feasibility of injection molding and the structural strength of lower plastic 10 at the groove, and on the other hand, it ensures that buffering groove 11 can withstand the impact force of the electrolyte caused by pouring and the weight of the electrolyte contained therein during electrolyte pouring, and prevents buffering groove 11 from flexing and deforming when the battery is subjected to heat or vibration.

[0047] In the illustrated embodiment, referring to FIG. 4, one buffer groove 11 is provided on the first side surface 1, and two connecting piece grooves 21 are provided on the second side surface 2. The two connecting piece grooves 21 are located at opposite ends of the buffer groove 11, i.e., t=2 and r=1. Four side walls, namely, first side wall 13, second side wall 14, third side wall 15, and fourth side wall 16, are provided at the bottom of the lower plastic body 10 along the longitudinal direction of the lower plastic body from left to right, i.e., n=4. Condition 2 requires that 1 mm≦p≦2 mm to ensure the feasibility and quality of each side wall during injection molding. The thickness of each side wall must satisfy p=(a-2g-d) / 4, ensuring that the thicknesses of the four side walls are equal. A side wall thickness of 1 mm≦p≦2 mm ensures the structural strength of the lower plastic body during assembly or vibration. Furthermore, the thickness of the side walls is uniform, which ensures that each part of the lower plastic receives uniform force, and reduces deformation of the lower plastic when subjected to force. Note that, in other embodiments, t, r, and n may be other values ​​and may be determined based on actual needs, and are not particularly limited herein.

[0048] The first side wall 13 is the left side wall of the groove 21 for the left connecting piece, the second side wall 14 is the right side wall of the groove 21 for the left connecting piece and the left side wall of the buffer groove 11, the third side wall 15 is the right side wall of the buffer groove 11 and the left side wall of the groove 21 for the right connecting piece, and the fourth side wall 16 is the right side wall of the groove 21 for the right connecting piece.

[0049] Conditions 1 and 2 ensure that the wall thickness between each structure is controlled to 1mm to 2mm, which satisfies the feasibility of injection molding and structural strength while saving a large amount of manufacturing materials.

[0050] In some examples, ce may be 1 mm, 1.1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, etc., but of course ce may be other values ​​between 1 mm and 2 mm, which will not be listed here.

[0051] In some examples, cf may be 1 mm, 1.3 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, etc., but of course ce may be other values ​​between 1 mm and 2 mm, which will not be listed here.

[0052] In some instances, ce may be equal to cf, ce may be greater than cf, or ce may be less than cf.

[0053] In some examples, p may be 1 mm, 1.1 mm, 1.3 mm, 1.7 mm, 1.9 mm, 2 mm, etc., but of course p may be other values ​​between 1 mm and 2 mm, which will not be listed here.

[0054] In other embodiments, the lower plastic satisfies either condition 1 or condition 2.

[0055] 1 to 6, a pole post through-hole 4 that penetrates the lower plastic body along the thickness direction of the lower plastic body is provided in the connecting piece recessed groove 21. The pole post through-hole 4 is for passing through the pole, and the connecting piece is fixed to the pole by welding.

[0056] In some embodiments of the present invention, as shown in FIG. 6, the electrode post through-hole 4 is located at the center of the lower plastic body in the width direction of the lower plastic body, i.e., H1=H2, and the structure of the lower plastic body 10 is axially symmetrical. When the lower plastic body 10 is installed in the battery, the lower plastic body 10 has no directionality and can still be used even if it is rotated horizontally by 180°, which is advantageous for saving assembly time.

[0057] In some embodiments of the present invention, as shown in Figures 4 to 6, the n side walls include a first side wall 13 which is a side wall away from the buffer groove 11 of the connecting piece groove 21, and a second side wall 14 which is a side wall closer to the buffer groove 11 of the connecting piece groove 21, and the distance between the pole post through hole 4 and the first side wall 13 is greater than the distance between the pole post through hole 4 and the second side wall 14. It should be noted that the "distance between the pole post through hole 4 and the first side wall 13" referred to here refers to the distance from the center of the pole post through hole 4 to the first side wall 13, and the "distance between the pole post through hole 4 and the second side wall 14" refers to the distance from the center of the pole post through hole 4 to the second side wall 14, and the distance from the center of the pole post through hole 4 to the first side wall 13 is greater than the distance from the center of the pole post through hole 4 to the second side wall 14, i.e., H3 > H4, which means that the center of the pole post through hole 4 is far away from the edge of the lower plastic body, reducing the risk of cracking at the pole post through hole 4.

[0058] According to the lower plastic 10 of the embodiment of the present invention, by opening a buffer groove 11 on the first side 1 of the lower plastic body, the electrolyte can be buffered, preventing excessive injection pressure from damaging the bare cells in the battery case, and reducing the material of the lower plastic body. By opening a connecting piece groove 21 on the second side 2, the overall thickness after connecting the connecting piece and the lower plastic 10 can be reduced, and the material of the lower plastic body can also be reduced. This saves on the material required to mold the lower plastic 10 and the time required for cooling the injection molding, resulting in significant cost savings.

[0059] In some embodiments of the present invention, the projection areas of the connecting piece groove 21 and the buffer groove 11 on the lower plastic body are offset from each other, which is advantageous in preventing excessive cutting of the thickness of the lower plastic body and maintaining high strength of the lower plastic body.

[0060] According to some embodiments of the present invention, the offset between the projected areas of the connecting piece groove 21 and the buffering groove 11 on the lower plastic body is 1 mm to 2 mm. As shown in FIG. 5 , the offset between the projected areas of the connecting piece groove 21 and the buffering groove 11 on the lower plastic body is p, i.e., the thickness of the sidewall is p, and 1 mm≦p≦2 mm. If p<1 mm, the connection strength between the connecting piece groove 21 and the buffering groove 11 is low, and the lower plastic body is prone to fracture in the region between the connecting piece groove 21 and the buffering groove 11. If p>2 mm, the thickness of the lower plastic body varies significantly, making injection molding more difficult and reducing the success rate of the injection molding. Alternatively, p may be 1 mm, 1.1 mm, 1.3 mm, 1.7 mm, 1.9 mm, 2 mm, etc. Of course, p may be any other value between 1 mm and 2 mm, which will not be listed here.

[0061] 2, 4 and 6, there are two connecting piece grooves 21 and one buffer groove 11, and the two connecting piece grooves 21 are located at both ends of the buffer groove 11, so that the connecting piece area is offset from the injection buffer area, which is advantageous for rational use of space, and the two connecting piece grooves 21 facilitate the connection between the plastic 10 and the two connecting pieces. The recessed structure of the buffer groove 11 enhances the mechanical strength of the middle area of ​​the lower plastic body to a certain extent, and the recessed structure of the connecting piece groove 21 enhances the mechanical strength of the both end areas of the lower plastic body to a certain extent.

[0062] In some embodiments of the present invention, as shown in Figures 2 and 7, the lower plastic body has a certain thickness, a first side surface 1 and a second side surface 2 connected by an outer periphery 3, and a notch 22 formed in the second side surface 2. The notch 22 has an outer periphery wall 221 spaced from the outer periphery 3 and a groove bottom wall 222, and a connecting piece groove 21 is formed in the groove bottom wall 222. The provision of the notch 22 can enhance the mechanical strength of the second side surface 2 of the lower plastic body to some extent. The notch 22 can also be used as a heat-sealing area for the Mylar polyester film. Specifically, the top of the Mylar polyester film is placed in the notch 22, and then the Mylar polyester film is bonded to the lower plastic body by a heat-sealing process.

[0063] 8, a positioning protrusion 212 protruding away from the first side surface 1 is provided in the connecting piece groove 21, and the end face of the positioning protrusion 212 is flush with the groove bottom wall 222 of the notched groove 22. The positioning protrusion 212 is offset from the pole through-hole 4, and the positioning protrusion 212 can perform a positioning function for the connecting piece. For example, a positioning hole is opened in the connecting piece, and the positioning protrusion 212 is inserted into the positioning hole, thereby enabling the connecting piece to be positioned in the connecting piece groove 21, and further facilitating welding and fixing of the connecting piece to the pole in the pole through-hole 4.

[0064] In some embodiments of the present invention, the lower plastic body has a flat structure, a length of 300 mm or more, and a width of 100 mm or more, thereby ensuring that the lower plastic body matches the corresponding battery and avoiding an undersized lower plastic body that would affect its normal use, and a thickness of 4 mm or more, thereby ensuring that the thickness of the lower plastic body is not too thin, which would excessively reduce the strength of the lower plastic body. Specifically, as shown in Figures 3 to 5, if the length of the lower plastic body is a, a ≥ 300 mm, if the width of the lower plastic body is b, b ≥ 100 mm, and if the thickness of the lower plastic body is c, c ≥ 4 mm. Alternatively, a may be 300 mm, 310 mm, 320 mm, 330 mm, 340 mm, etc., b may be 100 mm, 105 mm, 110 mm, 113 mm, 116 mm, 119 mm, etc., and c may be 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, etc., and of course, a, b, and c may be other values ​​greater than their respective lower limit values, which are not listed here.

[0065] In some embodiments of the present invention, the thickness of the lower plastic body is 30 mm or less, which ensures that the lower plastic body is thin, saving material, and the thin lower plastic body is advantageous for improving the injection molding efficiency of the lower plastic 10 and improving the molding success rate of the lower plastic 10.

[0066] In some embodiments of the present invention, the length of buffer groove 11 is 285 mm or more, the width of buffer groove 11 is 96 mm or more, and the depth of buffer groove 11 is 2.5 mm or more, thereby ensuring that buffer groove 11 matches the corresponding battery, and the area of ​​buffer groove 11 is large and the depth is sufficient to allow buffer groove 11 to effectively buffer liquid during injection, avoiding the buffer groove 11 being too small to affect the buffering effect during injection, such as preventing liquid overflow. Specifically, as shown in Figures 3 to 5, the length of buffer groove 11 is d, where d is 285 mm or more, the width of buffer groove 11 is m, where m is 96 mm or more, and the depth of buffer groove 11 is f, where f is 2.5 mm or more. Alternatively, d may be 2 mm, 4 mm, 5 mm, 6 mm, 10 mm, etc., m may be 96 mm, 100 mm, 104 mm, 108 mm, 112 mm, 116 mm, etc., and f may be 2.5 mm, 2.7 mm, 2.9 mm, 3.0 mm, etc., and of course, d, m, and f may have other values ​​greater than their respective lower limit values, which are not listed here.

[0067] In some embodiments of the present invention, the dimension of the connecting piece groove 21 in the longitudinal direction of the lower plastic body is 50 mm or more, the dimension of the connecting piece groove 21 in the width direction of the lower plastic body is 86 mm or more, and the depth of the connecting piece groove 21 is 2.5 mm or more, thereby ensuring that the connecting piece groove 21 matches the other structures of the battery, and the area of ​​the connecting piece groove 21 is large and the depth is sufficiently deep, thereby reducing the difficulty of connecting with the connecting piece. Specifically, as shown in Figures 5 and 6, if the dimension of the connecting piece groove 21 in the longitudinal direction of the lower plastic body is g, then g ≥ 50 mm, if the dimension of the connecting piece groove 21 in the width direction of the lower plastic body is q, then q ≥ 86 mm, and if the depth of the connecting piece groove 21 is e, then e ≥ 2.5 mm. Alternatively, g may be 50 mm, 52 mm, 54 mm, 56 mm, 58 mm, etc., q may be 86 mm, 88 mm, 90 mm, 92 mm, 94 mm, etc., and e may be 2.5 mm, 2.7 mm, 2.9 mm, 3.0 mm, etc., and of course, g, q, and e may have other values ​​greater than their respective lower limit values, which are not listed here.

[0068] In some embodiments of the present invention, as shown in Fig. 6, the corner of the connecting piece groove 21 near the buffer groove 11 is a fillet 211, and the fillet radius of the fillet 211 is 5mm to 20mm. The fillet dimensions of the fillet 211 match the outer dimensions of the connecting piece, so that the fillet 211 can restrict the position of the connecting piece. Furthermore, the fillet 211 structure can alleviate stress concentration at the corner of the connecting piece groove 21 compared to a right angle, and can prevent cracking of the lower plastic 10.

[0069] In some embodiments of the present invention, the lower plastic body may have a liquid return hole penetrating the thickness direction of the lower plastic body, so that when the battery is inverted, the electrolyte at the top can return through the liquid return hole.

[0070] A battery according to another embodiment of the present invention includes the plastic 10 according to any of the above embodiments.

[0071] According to the battery of the embodiment of the present invention, by opening a buffer groove 11 on the first side 1 of the lower plastic body and opening a connecting piece groove 21 on the second side 2, the amount of material used in the lower plastic 10 can be reduced, saving costs, and the possibility of injection molding can be ensured by at least one of conditions 1 and 2.

[0072] In some embodiments of the present invention, as shown in Figures 1-2 and 10, the battery further includes a cover plate 20 located on the first side 1 of the lower plastic 10, the cover plate 20 having a liquid inlet 201 formed therein, the projection of the liquid inlet 201 on the first side 1 being located within the buffer groove 11, and the inlet duct 12 being offset from the liquid inlet 201, such that after the electrolyte enters the buffer groove 11 through the liquid inlet 201, it is adequately buffered within the buffer groove 11 and can then enter the battery through the inlet duct 12, thereby reducing the impact of the electrolyte on the battery interior and facilitating the inletting process. As shown in Figures 1-3 and 6, the inlet duct 12 is located within the buffer groove 11 and adjacent to the right-hand connecting piece groove 21. Of course, in some embodiments not shown, the flow guide hole 12 may be located within the buffer groove 11 and adjacent to the left-end connecting piece groove 21, or the flow guide hole 12 may be located at the center of the buffer groove 11.

[0073] In some embodiments of the present invention, as shown in Figures 1-2 and 9-10, the battery further includes a connecting piece 30 and a pole, the pole is installed through the pole through-hole 4, the connecting piece 30 is located on the second side 2 of the lower plastic 10, and the connecting piece 30 includes a pole connecting segment 301 and a pole lug connecting segment 302, the pole connecting segment 301 and the pole lug connecting segment 302 are connected directly or indirectly via an intermediate connecting segment. The pole connecting segment 301 is located in the connecting piece groove 21, and the pole connecting segment 301 and the pole are fixedly connected. The electrode lug connection segment 302 extends away from the bottom plastic 10, and the included angle between the electrode lug connection segment 302 and the electrode post connection segment 301 is 70° to 110°. The electrode lug connection segment 302 is suitable for connection to other components of the battery (e.g., the electrode lug 401 of the bare cell 40 described below). Because the electrode lug connection segment 302 and the electrode post connection segment 301 are located in different planes, the electrode lug connection segment 302 can be easily positioned in a location that facilitates connection work, and the lateral dimension of the battery (i.e., the dimension of the battery in the F1-F2 direction) can be reduced. Optionally, the included angle between the electrode lug connection segment 302 and the electrode post connection segment 301 is 90°, i.e., the electrode lug connection segment 302 is perpendicular to the electrode post connection segment 301.

[0074] In some embodiments of the present invention, as shown in FIGS. 1-2 and 9-10, the battery further includes at least one bare cell 40, which is disposed on the side of the electrode post connecting segment 301 away from the lower plastic 10. The longitudinal extension direction of the bare cell 40 coincides with the longitudinal direction of the lower plastic body. The longitudinal end of the bare cell 40 is the electrode tab 401, which is connected to the electrode tab connecting segment 302. The longitudinal direction of the lower plastic body is the direction F1-F2 shown in FIG. 10. Since the longitudinal extension direction of the bare cell 40 coincides with the longitudinal direction of the lower plastic body, the distance between the large surface of the bare cell 40 and the flow guide holes 12 on the lower plastic body can be reduced. As a result, when the electrolyte enters the battery through the flow guide holes 12, the electrolyte can come into contact with the large surface of the bare cell 40 more quickly and more, thereby quickly infiltrating the bare cell 40 and shortening the standing time. Additionally, the pole lug 401 is located laterally to facilitate connection between the pole lug 401 and the pole lug connecting segment 302 .

[0075] 11 is a schematic diagram showing the relative positions of the bare cell 40 and the lower plastic 10 in a cross section perpendicular to the F1-F2 direction in FIG. 10. In some embodiments of the present invention, as shown in FIGS. 1 to 2 and 10 to 11, the bare cell 40 has a protrusion 402 protruding toward the lower plastic 10, the protrusion 402 including a proximal portion 4021 and a distal portion 4022, the distance between the proximal portion 4021 and the lower plastic 10 being closest, and the distance between the distal portion 4022 and the lower plastic 10 being greater than the distance between the proximal portion 4021 and the lower plastic 10, as shown in FIG. 11, the distance between the proximal portion 4021 and the lower plastic 10 is H1, the distance between the distal portion 4022 and the lower plastic 10 is H2, H2>H1, and the proximal portion 4021 is the position where the bare cell 40 is closest to the lower plastic 10 and the highest point of the bare cell 40. There is a certain space between the protrusion 402 and the lower plastic 10, which can reduce the obstruction of the electrolyte passing through this space, making it easier for the electrolyte to flow downward and diffuse.

[0076] In one example, the outer surface of the protrusion 402 can be configured as a semi-cylindrical surface, whereby the proximal portion 4021 is one generatrix of the semi-cylindrical surface.

[0077] In some embodiments, the projection of the flow hole 12 on the protrusion 402 is located on the distal portion 4022, so that when the electrolyte enters the interior of the battery through the flow hole 12, the electrolyte drips directly onto the distal portion 4022 rather than onto the proximal portion 4021, and the distal portion 4022 can more quickly guide the electrolyte into the side space of the bare cell 40.

[0078] Alternatively, in some other embodiments, the flow guide hole 12 is offset from the protrusion 402, i.e., the flow guide hole 12 is directly opposite the side space of the bare cell 40, so that the electrolyte can directly enter the side space of the bare cell 40 through the flow guide hole 12.

[0079] In some embodiments of the present invention, a plurality of flow guide holes 12 are provided in the buffer groove 11, penetrating the lower plastic body in the thickness direction, and flow guide holes 12 are provided on both sides of the proximal portion 4021. The plurality of flow guide holes 12 can disperse the electrolyte, reduce the impact force on the bare cell 40, improve the efficiency of battery injection, increase the rate at which the electrolyte permeates the bare cell 40, and shorten the standing time.

[0080] In one example, there may be two flow guide holes 12, with the two flow guide holes 12 being located on either side of the proximal portion 4021 at the distal portion 4022, or in another example, there may be two flow guide holes 12, with the two flow guide holes 12 being located on either side of the bare cell 40.

[0081] In some other embodiments of the present invention, the number of the flow guide holes 12 is one.

[0082] In some embodiments of the present invention, the battery cell includes multiple bare cells 40, and the flow guide hole 12 is located at the midline between two adjacent bare cells 40, so that there is a large space below the flow guide hole 12 and the obstruction to the electrolyte can be reduced.

[0083] A battery module according to another embodiment of the present invention includes a battery according to any of the above embodiments.

[0084] According to the battery module of the embodiment of the present invention, by opening a buffer groove 11 on the first side 1 of the lower plastic body and opening a connecting piece groove 21 on the second side 2, the amount of material used in the lower plastic 10 can be reduced, saving costs, and the possibility of injection molding can be ensured by at least one of conditions 1 and 2.

[0085] Specifically, one battery module can include one or more batteries. The batteries are electrically connected in series, parallel, or series-parallel. "Multiple" can mean two or more.

[0086] A power consuming device according to another embodiment of the present invention includes a battery module as described in the above embodiments.

[0087] According to the embodiment of the power consumption device of the present invention, by opening a buffer groove 11 on the first side 1 of the lower plastic body and opening a connecting piece groove 21 on the second side 2, the amount of material used in the lower plastic 10 can be reduced, saving costs, and the possibility of injection molding can be ensured by at least one of conditions 1 and 2.

[0088] Specifically, a power consuming device may include one or more battery modules, and the battery modules may be electrically connected in series, parallel, or series-parallel.

[0089] The power consuming device includes, but is not limited to, an energy storage device and a vehicle. The energy storage device may be an energy storage container including a box and a battery cluster disposed within the box, the battery cluster including a cluster holder and a plurality of battery packs, with a plurality of battery modules attached to the cluster holder. The energy storage device may be a home energy storage cabinet.

[0090] The battery module can be applied as a power battery pack to vehicles, including but not limited to pure electric vehicles, hybrid vehicles, and range-extending electric vehicles.

[0091] In the description herein, references such as "one embodiment," "some embodiments," "example," "particular example," or "some examples" mean that a particular feature, structure, material, or characteristic described in connection with at least one embodiment or example of the present invention is included in at least one embodiment or example of the present application. In the description herein, general references to the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art can combine and combine different embodiments described herein.

[0092] Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not limiting of the present invention, and that those skilled in the art may change, modify, substitute, and vary the above embodiments within the scope of the present invention. [Explanation of symbols]

[0093] 10 Lower Plastic 1 1st aspect 11 Buffer groove 12 Direction hole 13 First side wall 14 Second side wall 15 Third side wall 16 Fourth Side Wall 2 Second aspect 21 Groove for connecting piece 211 Chamfering 212 Positioning protrusion 22 Notched groove 221 Peripheral groove wall 222 Groove bottom wall 3 Outer surface 4 pole through hole 20 cover plate 201 Liquid injection hole 30 Connecting piece 301 Pole connection segment 302 Polar Ear Connection Segment 40 Bare Cell 401 Polar ear 402 Protrusion 4021 Proximal part 4022 Distal part

Claims

1. A lower plastic including a lower plastic body, The lower plastic body is A first side (1); The first side surface (1) and a second side surface (2) disposed opposite each other are provided. The first side (1) has a buffer groove (11) recessed toward the second side (2), the buffer groove (11) has at least one flow guide hole (12) penetrating the lower plastic body in the thickness direction, the second side (2) has a connecting piece groove (21) recessed toward the first side (1), the connecting piece groove (21) has a pole post through hole (4) penetrating the lower plastic body in the thickness direction, and the lower plastic satisfies at least one of conditions 1 and 2. In the condition 1, 1 mm≦c-e≦2 mm, 1 mm≦c-f≦2 mm, where c is the thickness of the lower plastic body, f is the depth of the buffer groove (11), and e is the depth of the connecting piece groove (21). In the condition 2, 1 mm≦p≦2 mm, p=(a-t*g-r*d) / n, where g is the length of the connecting piece groove (21), t is the number of the connecting piece grooves (21), r is the number of the buffer grooves (11), d is the length of the buffer groove (11), a is the length of the lower plastic body, and p is the thickness of each of the n side walls arranged along the longitudinal direction of the lower plastic body, and the n side walls include a first side wall (13) which is the side wall of the connecting piece groove (21) that is away from the buffer groove (11) and a second side wall (14) which is the side wall of the connecting piece groove (21) that is closer to the buffer groove (11).

2. 2. The lower plastic body according to claim 1, wherein the projection areas of the connecting piece groove (21) and the buffer groove (11) on the lower plastic body are offset from each other.

3. The lower plastic according to claim 1, characterized in that there are two connecting piece grooves (21), the number of buffer grooves (11) is one, and the two connecting piece grooves (21) are located at both ends of the buffer groove (11), respectively, so that t = 2, r = 1, and n = 4.

4. The lower plastic according to claim 1, characterized in that the first side (1) and the second side (2) are connected via an outer peripheral surface (3), a notched groove (22) is provided in the second side (2), and the notched groove (22) has an outer peripheral groove wall (221) spaced apart from the outer peripheral surface (3) and a groove bottom wall (222) in which the connecting piece groove (21) is opened.

5. The lower plastic according to claim 4, characterized in that a positioning protrusion (212) is provided within the connecting piece groove (21), the positioning protrusion (212) protrudes on the side away from the first side surface (1), and the end face of the positioning protrusion (212) is flush with the groove bottom wall (222) of the notch groove (22).

6. The lower plastic body according to claim 1, characterized in that the lower plastic body has a flat structure, the length of the lower plastic body is 300 mm or more, the width of the lower plastic body is 100 mm or more, and the thickness of the lower plastic body is 4 mm or more.

7. The lower plastic according to claim 6, wherein the thickness of the lower plastic body is 30 mm or less.

8. The buffer groove (11) has a length of 285 mm or more, a width of 96 mm or more, and a depth of 2.5 mm or more. The plastic according to claim 1.

9. The lower plastic body according to claim 1, characterized in that the longitudinal dimension of the groove (21) for the connecting piece of the lower plastic body is 50 mm or more, the widthwise dimension of the groove (21) for the connecting piece of the lower plastic body is 86 mm or more, and the depth of the groove (21) for the connecting piece of the lower plastic body is 2.5 mm or more.

10. The lower plastic according to claim 1, characterized in that the corner portion of the connecting piece groove (21) closer to the buffer groove (11) is a fillet (211), and the fillet radius of the fillet (211) is 5 mm to 20 mm.

11. The lower plastic body according to claim 1, wherein the pole post through-hole (4) is located at the center of the lower plastic body in the width direction of the lower plastic body.

12. A lower plastic as described in any one of claims 1 to 11, characterized in that the distance between the pole post through hole (4) and the first side wall (13) is greater than the distance between the pole post through hole (4) and the second side wall (14).

13. A battery comprising the lower plastic of claim 1.

14. The battery according to claim 13, further comprising a cover plate (20) located on the side of the first side (1) of the lower plastic, wherein the cover plate (20) has a liquid filling hole (201) formed therein, the projection of the liquid filling hole (201) on the first side (1) is located within the buffer groove (11), and the flow guide hole (12) is positioned offset from the liquid filling hole (201).

15. The battery of claim 13, further comprising a connecting piece (30) located on the second side (2) of the lower plastic, and a pole installed through the pole post through-hole (4), the connecting piece (30) comprising a connected pole post connecting segment (301) and a pole lug connecting segment (302), the pole post connecting segment (301) located in the connecting piece groove (21) and fixedly connected to the pole post, the pole lug connecting segment (302) extending in a direction away from the lower plastic, and the included angle between the pole lug connecting segment (302) and the pole post connecting segment (301) is 70° to 110°.

16. The battery of claim 15 further includes at least one bare cell (40), the bare cell (40) being arranged on the side of the pole pole connecting segment (301) away from the lower plastic, the longitudinal extension direction of the bare cell (40) being aligned with the longitudinal direction of the lower plastic body, the longitudinal end of the bare cell (40) being a pole ear (401), and the pole ear (401) being connected to the pole ear connecting segment (302).

17. The bare cell (40) has a protrusion (402) protruding toward the lower plastic, the protrusion (402) including a proximal portion and a distal portion, the distance between the proximal portion and the lower plastic being the shortest, the distance between the distal portion and the lower plastic being greater than the distance between the proximal portion and the lower plastic, and the flow guide on the protrusion (402).

17. The battery of claim 16, wherein the projection of the hole (12) is located on the distal portion or the flow guide hole (12) is offset from the protrusion (402).

18. The battery of claim 17, characterized in that the buffer groove (11) has a plurality of flow guide holes (12) penetrating the lower plastic body along the thickness direction, and the flow guide holes (12) are provided on both sides of the proximal portion.

19. 17. The battery according to claim 16, wherein the battery includes a plurality of bare cells (40), and the flow guide hole (12) is located at the midline between two adjacent bare cells (40).

20. A battery module comprising the battery according to any one of claims 13 to 19.

21. A power consuming device comprising the battery module of claim 20.

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