Lower plastic structure, battery top cover, and battery

Abstract

The present application provides a lower plastic structure, a battery top cover, and a battery. The lower plastic structure comprises a first split portion and a second split portion; the first split portion is connected to the second split portion in an abutting manner; a first surface of the first split portion and / or the second split portion is provided with a recess; a flow passage is formed at a side surface of the recess; the flow passage passes through a side wall of the recess; and the recess is communicated with the outside of the lower plastic structure by means of the flow passage.

Description

Lower plastic structure, battery top cover and battery

[0001] This application claims priority to Chinese Patent Application No. 202422654697.6, filed with the Chinese Patent Office on October 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a lower plastic structure, a battery top cover, and a battery. Background Technology

[0003] In existing battery cells, the flow channels for the lower plastic casing are generally located at the bottom or side. When located at the bottom, the core pack may block the flow channels during core pressing, leading to poor electrolyte injection and blockage of the explosion-proof valve channel. When the flow channels are located on the side, i.e., when holes are made at the edge reinforcing ribs of the lower plastic casing, the reinforcing ribs are grooved, weakening their reinforcing effect and causing the lower plastic casing to warp, affecting assembly. Moreover, for longer lower plastic casings, shrinkage after one-piece injection molding can easily cause warping and arching, which is detrimental to top cover assembly. In contrast, with a split lower plastic casing top cover structure, the circular electrode post can easily rotate during assembly, causing the lower plastic casing to shift, i.e., the edge of the lower plastic casing is not parallel to the edge of the top cover sheet. Technical issues

[0004] The lower plastic flow channel of the battery is easily blocked. Solution

[0005] This application provides a lower plastic structure, a battery top cover, and a battery.

[0006] In a first aspect, this application provides a lower plastic structure, including a first split part and a second split part, which are connected to each other. The first surface of the first split part and / or the second split part has a recess, and a flow channel is provided on the side of the recess. The flow channel penetrates the side wall of the recess, and the recess is connected to the outside of the lower plastic structure through the flow channel.

[0007] Secondly, this application provides a battery top cover, including a top cover sheet and the aforementioned lower plastic structure, wherein the top cover sheet and the lower plastic structure are stacked, and the positioning post of the lower plastic structure extends into the blind hole of the top cover sheet.

[0008] Thirdly, this application provides a battery including a battery cell, terminals, and the aforementioned battery top cover. The battery top cover is disposed above the battery cell. The lower plastic structure of the battery top cover has a through-hole terminal. The terminal is disposed between the lower plastic structure and the top cover sheet and is located at the terminal hole. The leads of the battery cell are embedded in a receiving groove below the lower plastic structure and are located at the terminal hole. The terminal is electrically connected to the tabs of the battery cell through the leads. Beneficial effects

[0009] The beneficial effects of this application are as follows: By setting a flow channel on the side wall of the recess, the electrolyte can flow smoothly into the battery without remaining in the lower plastic structure. Specifically, on the one hand, the recess and the flow channel form a channel for electrolyte flow, allowing the electrolyte flowing into the recess to flow out through the flow channel to the outside of the lower plastic structure, thus preventing electrolyte residue in the recess. On the other hand, setting the lower plastic structure in the form of a first split part and a second split part connected together prevents the lower plastic structure from warping due to excessive length. At the same time, the side wall of the recess can also play a supporting role, thereby improving the strength of the lower plastic structure and preventing warping. Attached Figure Description

[0010] Figure 1 shows an isometric view of the lower plastic structure provided in some implementations of this application;

[0011] Figure 2 shows a schematic diagram of the lower plastic structure with the first surface facing upwards, provided in some implementations of this application;

[0012] Figure 3 shows a schematic diagram of the lower plastic structure with the second surface facing upwards, provided in some implementations of this application;

[0013] Figure 4 shows an isometric view of the first split portion provided in some implementations of this application;

[0014] Figure 5 shows a schematic diagram of the structure with the first surface facing upwards of the first split part provided in some implementations of this application;

[0015] Figure 6 shows a schematic diagram of the structure with the second surface facing upwards of the first split portion provided in some implementations of this application;

[0016] Figure 7 shows an enlarged view of the flow channel in Figure 4;

[0017] Figure 8 shows an enlarged view of the injection hole in Figure 4;

[0018] Figure 9 shows an enlarged view of the explosion-proof protrusions and explosion-proof holes in Figure 4;

[0019] Figure 10 shows a schematic diagram of the structure of the second split part provided in some implementations of this application;

[0020] Figure 11 shows a schematic diagram of the structure of the battery top cover provided in some implementations of this application;

[0021] Figure 12 shows an exploded view of Figure 11;

[0022] Figure 13 shows an exploded view of Figure 12 from another perspective.

[0023] The above figures include the following reference numerals:

[0024] 10. First split part; 11. Rib; 111. Explosion-proof notch; 112. Clearance recess; 12. Flow channel; 121. First channel; 122. Second channel; 13. Recess; 14. Connecting protrusion; 15. Pin positioning boss; 16. Edge boss; 17. Pole post hole; 20. Second split part; 21. Connecting groove; 22. First surface; 23. Second surface; 24. Positioning post; 30. Injection hole; 40. Explosion-proof protrusion; 50. Explosion-proof hole; 60. Top cover plate; 61. Blind hole; 70. Pole post; 80. Pin; 90. Insulating film.

[0025] As shown in Figures 1 to 10, a lower plastic structure includes a first split part 10 and a second split part 20, which are connected to each other. The first surface 22 of the first split part 10 and / or the second split part 20 has a recess 13. A flow channel 12 is provided on the side of the recess 13, which penetrates the side wall of the recess 13. The recess 13 is connected to the outside of the lower plastic structure through the flow channel 12.

[0026] In this embodiment, a flow channel 12 is provided on the side wall of the recess 13, which allows the electrolyte to flow smoothly into the battery and not remain in the lower plastic structure. Specifically, on the one hand, the recess 13 and the flow channel 12 form a channel for electrolyte flow, so that the electrolyte flowing into the recess 13 can flow out through the flow channel 12 to the outside of the lower plastic structure, thereby avoiding electrolyte residue in the recess 13. On the other hand, the lower plastic structure is set in the form of the first split part 10 and the second split part 20 being connected, which avoids the lower plastic structure from warping and deformation due to excessive length. At the same time, the side wall of the recess 13 can also play a supporting role, thereby improving the strength of the lower plastic structure and preventing warping.

[0027] In this embodiment, the recess 13 is formed by ribs 11. Specifically, the first surface 22 of the first segment 10 and / or the second segment 20 also has ribs 11, which are located around the periphery of the recess 13, thereby forming the recess 13 between the ribs 11. That is, the recess 13 in this embodiment is formed by ribs 11 surrounding it. Since the ribs 11 protrude from the first surface 22, the portion of the first surface 22 without ribs 11 can naturally form the recess 13. Under the above configuration, the ribs 11 serve as the sidewalls of the recess 13, and the side surfaces of the ribs 11 are the side surfaces of the recess 13.

[0028] In one embodiment, the specific number of ribs 11 can be set as needed, and there can be one or more ribs 11. When there is one rib 11, the rib 11 is annular, so that the space inside the annulus serves as a recess 13. When there are multiple ribs 11, at least some of the ribs 11 can be bent and connected end to end in sequence, thereby also forming an annular structure, which in turn surrounds the recess 13.

[0029] It should be noted that the lower plastic structure in this embodiment is a long rectangle, the length direction of which is consistent with the length direction of the first split part 10 and the second split part 20, which is the left-right direction in Figure 1; the width direction of the lower plastic structure is also consistent with the width direction of the first split part 10 and the second split part 20, which is the direction from the lower left to the upper right in Figure 1; the first surface 22 is the surface of the lower plastic structure facing upward, that is, the surface of the first split part 10 in Figure 1 where the rib 11 is provided, that is, the side surface of the rib 11 away from the top cover 60 of the battery; the second surface is the surface of the lower plastic structure facing downward; the height direction of the lower plastic structure is the direction perpendicular to the first surface 22, that is, the up-down direction in Figure 1.

[0030] As shown in Figures 1, 2, and 3, this embodiment uses the example where the length of the first segment 10 is greater than the length of the second segment 20, and the width of the first segment 10 is the same as the width of the second segment 20. Both the rib 11 and the flow channel 12 are provided on the first segment 10 and the second segment 20. The lower plastic structure is a split design, and the length ratio between the first segment 10 and the second segment 20 can be set to 1.5:1 to 3:1 as needed. In one embodiment, the length ratio between the first segment 10 and the second segment 20 can be set to 2:1. Except for the two ends of the lower plastic structure, the middle portion of the first surface of the lower plastic structure is provided with a recess 13 and a flow channel 12. Of course, the length ratio of the first segment 10 and the second segment 20 can be adjusted according to actual needs. Alternatively, the rib 11 and the flow channel 12 can be provided only on the first segment 10, or only on the second segment 20.

[0031] In this embodiment, there are multiple recesses 13, which are arranged along the first surface 22 of the first split part 10 and / or the second split part 20. The ribs 11 are located between two adjacent recesses 13. Among all the ribs 11, the ribs 11 located at the edge of the lower plastic structure are provided with a flow channel 12 to avoid electrolyte residue in the electrolyte recesses 13. Specifically, in this embodiment, the ribs 11 are arranged along the length and width directions of the first split portion 10 and the second split portion 20, thereby forming multiple rectangular recesses 13. Three rows of parallel ribs 11 are arranged along the length direction of the lower plastic structure, thereby forming two rows of recesses 13 along the length direction of the lower plastic structure. Among them, the two rows of ribs 11 located at the edge of the lower plastic structure are provided with flow channels 12 within the range of each recess 13. In this way, when electrolyte remains inside the cell, since the lower plastic structure and the top cover plate 60 cannot be tightly pressed together, electrolyte may remain in the recesses 13 of the lower plastic structure. At this time, the flow channels 12 play a role in facilitating the outflow of electrolyte. Multiple ribs 11 are also arranged along the width direction of the lower plastic structure to cooperate with the ribs 11 along the length direction of the lower plastic structure to form recesses 13. The number of ribs 11 along the width direction of the lower plastic structure can be set according to the actual support needs of the lower plastic structure. Appropriately increasing the number of ribs 11 is beneficial to improving the strength of the lower plastic structure and enhancing its support function.

[0032] As shown in Figure 7, in this embodiment, the flow channel 12 includes a first channel 121 and a second channel 122. The first channel 121 is located on the side of the rib 11 and passes through the rib 11. The second channel 122 is located on the first surface 22 and communicates with the first channel 121. In this way, the electrolyte flowing into the recess 13 can flow out from both the side and bottom surfaces of the lower plastic structure. Specifically, in this embodiment, the rib 11 is erected on the first surface 22, with its length direction consistent with the length direction of the lower plastic structure and its height direction consistent with the height direction of the lower plastic structure. The rib 11 and the bottom surface of the lower plastic structure are perpendicularly arranged, and a through hole is opened at their connection point to form the flow channel 12. The through holes in the height direction of the rib 11 constitute the first channel 121, and the through holes in the bottom surface of the lower plastic structure constitute the second channel 122. The first channel 121 and the second channel 122 are arranged adjacent to each other, thus providing channels for electrolyte outflow in two directions, allowing it to flow out of the recess 13 more quickly. The flow channels 12 are located on the bottom surfaces of the rib 11 and the lower plastic structure, avoiding the weakening of the rib 11's support effect and the warping of the lower plastic structure that would occur if the rib 11 or the lower plastic structure were solely located on either. The shapes of the first channel 121 and the second channel 122 are not limited and can be rectangular, trapezoidal, circular, or other shapes. In this embodiment, a rectangle is used. It should be noted that the bottom surface of the lower plastic structure refers to the surface where the first surface 22 is located, and the side surface of the lower plastic structure refers to the edge of the bottom surface of the lower plastic structure that is perpendicular to the first surface 22, which is the side surface of the rib 11 where the flow channels 12 are located.

[0033] Considering factors such as ensuring smooth electrolyte outflow, the supporting effect of the rib 11, and the stable molding of the lower plastic, in this embodiment, along the length extension direction of the rib 11 where the flow channel 12 is located, the length of the flow channel 12 is greater than or equal to 0.5 mm and less than or equal to 5 mm; along the thickness direction of the rib 11 where the flow channel 12 is located, the width of the flow channel 12 is greater than or equal to the thickness of the rib 11 + 0.3 mm and less than or equal to the thickness of the rib 11 + 3 mm. In this way, on the one hand, the smooth outflow of electrolyte is satisfied, and on the other hand, the supporting effect of the rib 11 and the stable molding of the lower plastic are ensured. If the length and width of the flow channel 12 are too small, it will affect the outflow of electrolyte; if they are too large, it will affect the supporting strength of the rib 11, and the lower plastic may easily warp or arch. Along the depth direction of the recess 13, the height of the rib 11 is greater than or equal to the height of the flow channel 12 + 0.5 mm, so as to ensure that the rib 11 still has a certain solid height after the flow channel 12 is opened, so as to meet the stable molding of the lower plastic structure. Of course, the size of the flow channel 12 can be adjusted appropriately according to the actual situation. It should be noted that the length direction of the flow channel 12 is consistent with the length direction of the lower plastic structure, the width direction of the flow channel 12 and the thickness direction of the rib 11 are consistent with the width direction of the lower plastic structure, and the depth direction of the recess 13 and the height direction of the rib 11 are the height direction of the lower plastic structure.

[0034] As shown in Figure 2, in this embodiment, one of the first split portion 10 and the second split portion 20 has a connecting protrusion 14, and the other of the first split portion 10 and the second split portion 20 has a connecting groove 21. Both the connecting protrusion 14 and the connecting groove 21 extend along the first surface 22, and the connecting protrusion 14 is located within the connecting groove 21, thereby fixing the first split portion 10 and the second split portion 20, thus achieving the effect of integral fixation. Specifically, as shown in Figures 4 and 5, in this embodiment, the first split portion 10 is provided with a connecting protrusion 14, and the second split portion 20 is provided with a connecting groove 21. The raised ribs 11 along the width direction of the edge of the first split part 10 are connected to the connecting protrusions 14, and the connecting protrusions 14 are located on the side of the raised ribs 11 away from the first surface 22. The connecting protrusions 14 extend away from the recess 13 of the first split part 10, as shown in FIG10. The connecting groove 21 is located on the edge of the second split part 20, surrounded by multiple raised ribs 11, and matches the shape of the connecting protrusions 14. In this embodiment, the connecting protrusions 14 are set as rectangles, and the end away from the recess 13 of the first split part 10 is provided with rounded corners. The connecting groove 21 is formed by three raised ribs 11 forming a rectangle, and the end near the recess 13 of the first split part 10 is not provided with raised ribs 11, so that the top surface and the side surface of the connecting groove 21 are both open sides. When the connecting protrusions 14 and the connecting groove 21 are mated, the connecting protrusions 14 can be mated into the connecting groove 21 from the top surface and / or the side surface of the connecting groove 21, thereby facilitating the insertion of the connecting protrusions 14.

[0035] In addition to the above-mentioned arrangement, the top surface of the connecting groove 21 can be closed, and only one side of the connecting groove 21 can be open. In this way, the connecting protrusion 14 can be connected to the connecting groove 21 from the side of the connecting groove 21.

[0036] The reason why the top surface and one side of the connecting groove 21 are both set as open sides in this embodiment is that the connecting groove 21 in this embodiment is also provided with a positioning post 24 for cooperating with the top cover plate 60. Specifically, a positioning hole is opened on the connecting protrusion 14, and the positioning post 24 is set in the connecting groove 21. The positioning post 24 is located in the positioning hole, thereby connecting the first split part 10 and the second split part 20. Furthermore, the positioning post 24 protrudes from the side of the connecting protrusion 14 away from the first surface 22, that is, the positioning post 24 protrudes from the first surface 22 and its height is higher than the height of the rib 11, so that the positioning post 24 can mate and position with the blind hole 61 on the top cover plate 60, thereby fixing the lower plastic structure and the top cover plate 60. When the connecting groove 21 mates with the connecting protrusion 14, the connecting protrusion 14 extends downward into the connecting groove 21 from the top opening side of the connecting groove 21, and at the same time, the positioning post 24 extends into the positioning hole, thereby achieving the mating fit. Of course, the positions of the connecting protrusion 14 and the connecting groove 21 can be interchanged, and the positions of the positioning hole and the positioning post 24 can also be interchanged without affecting the fixing effect.

[0037] As shown in Figures 3 and 6, in this embodiment, the first split part 10 and the second split part 20 also have a second surface 23 opposite to the first surface 22. The second surface 23 has a receiving groove. The first split part 10 and the second split part 20 also have a pin positioning boss 15. The pin positioning boss 15 is located in the receiving groove and can separate and fix the pins 80 of the battery tab, thereby fixing the pins 80 and preventing the positive electrode pins 80 from melting and sticking together again. Specifically, rectangular receiving grooves are provided at both ends of the lower plastic structure along its length, that is, receiving grooves are provided at the two ends of the first split part 10 and the second split part 20 that are far apart from each other. The height of the receiving groove is the thickness of the positive electrode pin 80 + the thickness of the film on the pin 80 + the height of the lower plastic structure at the receiving groove. The thickness of the positive electrode pin 80 is its length in the height direction of the lower plastic structure, and the thickness of the film on the pin 80 is its length in the height direction of the lower plastic structure. The thickness of the film on the pin 80 can be set to 0.05mm-0.20mm, and the thickness of the lower plastic insulation can be set to 0.50mm-0.90mm.

[0038] A pin positioning boss 15 is provided in the receiving groove. The pin positioning boss 15 on the positive terminal is used to prevent the positive terminal pins 80 from sticking together after the fuse is broken. The boss on the negative terminal can fix the pins 80 after it is engaged with the groove of the pin 80.

[0039] In this embodiment, the two ends of the first split portion 10 and the second split portion 20 that are far apart from each other also have edge protrusions 16. The edge protrusions 16 extend in a direction away from the first surface 22, thereby facilitating lateral positioning during the assembly of the lower plastic structure. Specifically, the edge protrusions 16 are disposed on one side of the lower plastic structure where the receiving groove is located, and are disposed along the height direction of the lower plastic structure. The height of the edge protrusions 16 is higher than the height of the edge of the receiving groove, thereby preventing the lower plastic structure from being installed at an angle during assembly.

[0040] In this embodiment, the lower plastic structure also has an injection hole 30, which penetrates the first split part 10 or the second split part 20. The injection hole 30 is connected to the recess 13. One end of at least one rib 11 is located at the edge of the injection hole 30, and the end of the rib 11 located at the edge of the injection hole 30 has a relief recess 112. In this way, on the one hand, the rib 11 around the injection hole 30 can play a supporting role, preventing the injection hole 30 from being blocked during the core design, and preventing the lower plastic structure from deforming due to the opening. On the other hand, when the electrolyte is injected from the injection hole 30 and leakage occurs due to poor injection, the relief recess 112 can provide an outlet channel for the electrolyte. Specifically, in this embodiment, the injection hole 30 is located on the first split part 10. The injection hole 30 is located in the center of four adjacent recesses 13, which form a grid-like structure. A through hole for electrolyte outflow is provided at the protruding ribs 11 located at the edge of the grid-like structure and along the length of the lower plastic structure. The through hole can connect two recesses 13, so that the electrolyte can flow out through a small number of through holes, avoiding affecting the strength of the protruding ribs 11. Considering that during the core pressing design, when the electrolyte is injected into the injection hole 30, there may be a situation where the core package blocks the bottom of the injection hole 30. If a recess 112 is not provided to avoid it, the electrolyte may splash out from the injection hole 30. Therefore, the injection hole 30 is located at the intersection of the four protruding ribs 11, which form a cross-shaped protruding rib 11. The end of each protruding rib 11 near the injection hole 30 is made with a clearance treatment, which can not only provide support, but also facilitate the outflow of electrolyte when it remains in the recesses 13. To ensure the supporting function of the ribs 11, as shown in Figure 8, this embodiment only provides clearance recesses 112 on two opposite ribs 11. This ensures the electrolyte outflow channel and prevents the injection hole 30 from being blocked in the case of a core-pressed design, while also ensuring the strength of the ribs 11. Of course, the number of clearance recesses 112 can be adjusted according to actual needs.

[0041] In this embodiment, the lower plastic structure also includes an explosion-proof protrusion 40 and at least one explosion-proof hole 50. The explosion-proof protrusion 40 is located on the first surface 22 and forms an explosion-proof area for accommodating the explosion-proof valve. The explosion-proof hole 50 is located within the explosion-proof area and penetrates the first split part 10. The sum of the areas of all the explosion-proof holes 50 is greater than or equal to the product of the explosion-proof valve opening area, the pressure relief rate, and the safety factor, thereby preventing the explosion-proof valve hole from becoming blocked in the case of a pressure core design. Specifically, the explosion-proof hole 50 is located at the center of a grid-shaped structure formed by four adjacent recesses 13. The area of ​​the explosion-proof hole 50 must satisfy A≥S*Q*K, where A is the effective area of ​​the explosion-proof hole 50, S is the explosion-proof valve opening area, Q is the pressure relief rate, and K is the safety factor. The explosion-proof valve opening area S can be calculated based on the explosion-proof valve diameter and opening angle. The pressure relief rate Q depends on the gas pressure and the channel length. The safety factor is usually taken as 2-3. Meeting this requirement is sufficient for the explosion-proof valve to open normally. The explosion-proof protrusion 40 can be set in trapezoidal, rectangular, circular, or other shapes. In this embodiment, the explosion-proof protrusion 40 is set in an arc shape. Two arc-shaped explosion-proof protrusions 40 are arranged opposite each other along the length of the lower plastic structure to form an explosion-proof area. This not only prevents electrolyte residue from remaining in the cavity and allows electrolyte to flow out, but also provides a gas flow channel to ensure the normal opening of the explosion-proof valve. In this embodiment, the explosion-proof area is formed by setting multiple connecting ribs in a crisscross pattern to form multiple explosion-proof holes 50, thereby ensuring the strength of the lower plastic structure while opening the explosion-proof holes 50.

[0042] As shown in Figure 9, in this embodiment, the surfaces of the explosion-proof protrusion 40 and the rib 11 that are far from the first surface 22 are flush, thereby preventing the lower plastic structure from being pressed into contact with the explosion-proof valve by the core during core pressing and avoiding abnormal valve opening. At the same time, like the rib 11, they also provide support for the lower plastic structure.

[0043] In this embodiment, the explosion-proof hole 50 and the explosion-proof protrusion 40 are located within at least one recess 13, and the protruding rib 11 at the edge of the recess 13 containing the explosion-proof hole 50 and the explosion-proof protrusion 40 is provided with an explosion-proof notch 111, which penetrates the inner and outer sides of the recess 13. Specifically, considering the size of the explosion-proof area, the two explosion-proof protrusions 40 in this embodiment are arranged in a grid-shaped structure composed of four adjacent recesses 13, and are arranged opposite to each other along the length of the lower plastic structure; considering that when the battery cell has a core-pressed design, there may be a situation where the core package blocks the bottom of the explosion-proof hole 50. If the internal pressure of the core package is too high at this time, without the explosion-proof notch 111, a closed cavity will be formed in the recess 13, which may cause the explosion-proof valve to open abnormally. Therefore, the explosion-proof notch 111 is provided at the edge of the recess 13 around the explosion-proof hole 50 and at the protruding rib 11 located at the edge of the first connecting part. The explosion-proof notch 111 can span two The raised ribs 11 arranged along the length of the lower plastic structure reduce the number of explosion-proof notches 111. Thus, only two opposing explosion-proof notches 111 are needed to allow the electrolyte to flow out of the four recesses 13 around the explosion-proof hole 50. The explosion-proof notches 111 are located on the edge of the raised ribs 11 away from the first surface 22 and extend through the thickness direction of the raised ribs 11. The height of the explosion-proof notches 111 is consistent with the height of the connecting ribs at the explosion-proof hole 50 to facilitate the flow out of the electrolyte. In this way, the setting of the explosion-proof notches 111 allows the electrolyte to flow out and avoids electrolyte residue in the explosion-proof area. On the other hand, it provides a gas flow channel to ensure that the explosion-proof valve can open normally.

[0044] In this embodiment, positioning protrusions and pole holes 17 are provided at the two ends of the first segment 10 and the second segment 20 that are far apart from each other. The positioning protrusions and pole holes 17 are located at the positions where the lower plastic structure does not have ribs 11, and the positioning protrusions are closer to the edge of the lower plastic structure along its length direction than the pole holes 17. The positioning protrusions are provided on the upper surface of the lower plastic structure. The first segment 10 has two positioning protrusions and the second segment 20 has one positioning protrusion to serve a positioning function. One pole hole 17 is provided in each of the first segment 10 and the second segment 20, and the pole holes 17 are circular.

[0045] As shown in Figures 11 to 13, this application also provides a battery top cover, including a top cover sheet 60 and the aforementioned lower plastic structure. The top cover sheet 60 and the lower plastic structure are stacked, with the top cover sheet 60 stacked on top of the lower plastic structure. The positioning post 24 of the lower plastic structure extends into the blind hole 61 of the top cover sheet 60, thereby enabling the top cover sheet 60 and the lower plastic structure to accurately fit together, protecting the battery cells inside the battery and optimizing the electrolyte layout. The top cover sheet 60 and the lower plastic structure can be connected by snap-fit ​​connections, adhesive connections, or other connection methods.

[0046] As shown in Figures 11 to 13, this application also provides a battery, including a battery cell, a terminal post 70, and the aforementioned battery top cover. The battery top cover is disposed above the battery cell. The first split portion 10 and the second split portion 20 of the lower plastic structure of the battery top cover are both provided with through-hole terminal post holes 17. The terminal post 70 is disposed between the lower plastic structure and the top cover sheet 60 and is located at the terminal post hole 17. The lead 80 of the battery cell is embedded below the lower plastic structure and is located at the terminal post hole 17. The terminal post 70 is electrically connected to the electrode tab of the battery cell through the lead 80. The lead 80 adopts a bent inverted L-shaped sheet structure, one segment of which is embedded in the receiving groove on the bottom surface of the lower plastic structure and engages with the lead positioning boss 15 in the receiving groove, thereby achieving accurate positioning and installation of the lead 80. Overall, along the height of the lower plastic structure, the top cover 60, electrode post 70, lower plastic structure, and pin 80 are arranged from top to bottom. An insulating film 90 and other components can also be installed on the lower surface of the pin 80. The lower plastic structure is positioned above the battery cell, serving to fix the positive and negative electrode pins 80 and prevent the positive electrode pin 80 from melting and then sticking together again. Similarly, the connection between the electrode post 70 and the lower plastic structure, and between the pin 80 and the lower plastic structure, can be achieved using snap-fit ​​connections, adhesive connections, or other similar methods.

[0047] It should be noted that "multiple" in the above embodiments refers to at least two.

[0048] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0049] 1. This design makes the lower plastic flow channel less prone to clogging;

[0050] 2. The recesses and flow channels between the ribs form channels for the flow of electrolyte, allowing the electrolyte flowing into the recesses to flow out through the flow channels to the outside of the plastic structure, thus preventing electrolyte residue from remaining in the recesses.

[0051] 3. The lower plastic structure is designed with the first and second parts joined together, which avoids the lower plastic structure from warping and deforming due to excessive length. At the same time, the ribs can provide support, thereby improving the strength of the lower plastic structure.

Claims

1. A lower plastic structure, comprising: First sub-section (10); The second split part (20) is connected to the first split part (10) and the second split part (20). The first surface (22) of the first split part (10) and / or the second split part (20) has a recess (13). A flow channel (12) is provided on the side of the recess (13). The flow channel (12) penetrates the side wall of the recess (13). The recess (13) is connected to the outside of the lower plastic structure through the flow channel (12).

2. The lower plastic structure according to claim 1, wherein, There are multiple recesses (13) and they are arranged along the first surface (22) of the first split part (10) and / or the second split part (20). Among the sides of all the recesses (13), the flow channel (12) is provided at the side of the edge of the lower plastic structure.

3. The lower plastic structure according to claim 1, wherein, The flow channel (12) includes a first channel (121) and a second channel (122). The first channel (121) is located on the side of the recess (13) and penetrates the side wall of the recess (13). The second channel (122) is located on the first surface (22) and communicates with the first channel (121).

4. The lower plastic structure according to claim 3, wherein, Along the length direction extending from the side of the recess (13) where the flow channel (12) is located, the length of the flow channel (12) is greater than or equal to 0.5 mm and less than or equal to 5 mm; and / or Along the thickness direction of the sidewall of the recess (13) where the flow channel (12) is located, the width of the flow channel (12) is greater than or equal to the thickness of the sidewall of the recess (13) + 0.3 mm and less than or equal to the thickness of the sidewall of the recess (13) + 3 mm; and / or Along the depth direction of the recess (13), the height of the sidewall of the recess (13) is greater than or equal to the height of the flow channel (12) + 0.5 mm.

5. The lower plastic structure according to claim 1, wherein, One of the first split portion (10) and the second split portion (20) has a connecting protrusion (14), and the other of the first split portion (10) and the second split portion (20) has a connecting groove (21). The connecting protrusion (14) and the connecting groove (21) both extend along the first surface (22), and the connecting protrusion (14) is located in the connecting groove (21) to connect the first split portion (10) and the second split portion (20).

6. The lower plastic structure according to claim 5, wherein, The connecting protrusion (14) has a positioning hole, and a positioning post (24) is provided in the connecting groove (21). The positioning post (24) is located in the positioning hole, and the positioning post (24) protrudes from the first surface (22) and can be docked and positioned with the blind hole (61) of the top cover plate (60).

7. The lower plastic structure according to claim 5, wherein, The top and side surfaces of the connecting groove (21) are both open, and the connecting protrusion (14) is abutted into the connecting groove (21) by the top surface and / or side surface of the connecting groove (21); or The top surface of the connecting groove (21) is a closed side, the side surface of the connecting groove (21) is an open side, and the connecting protrusion (14) is connected to the connecting groove (21) from the side surface of the connecting groove (21).

8. The lower plastic structure according to any one of claims 1 to 7, wherein, The first surface (22) of the first split part (10) and / or the second split part (20) also has a rib (11), the rib (11) is located on the periphery of the recess (13), the side of the rib (11) serves as the side of the recess (13), the rib (11) is one or more, when the rib (11) is one, the rib (11) is annular and surrounds the recess (13), when the rib (11) is multiple, at least some of the ribs (11) are bent and connected in sequence to form the recess (13).

9. The lower plastic structure according to any one of claims 1 to 7, wherein, The first split part (10) and the second split part (20) also have a second surface (23) opposite to the first surface (22), the second surface (23) has a receiving groove, the first split part (10) and the second split part (20) also have a pin positioning boss (15), the pin positioning boss (15) is located in the receiving groove and can separate and fix the pins of the battery tab.

10. The lower plastic structure according to any one of claims 1 to 7, wherein, The first split portion (10) and the second split portion (20) also have edge protrusions (16) at their ends that are far apart from each other, and the edge protrusions (16) extend in a direction away from the first surface (22).

11. The lower plastic structure according to claim 8, wherein the lower plastic structure further comprises an injection hole (30), the injection hole (30) penetrating the first split part (10) or the second split part (20), the injection hole (30) communicating with the recess (13), at least one end of the protruding rib (11) being located at the edge of the injection hole (30), and the end of the protruding rib (11) located at the edge of the injection hole (30) having a relief recess (112).

12. The lower plastic structure according to claim 8, the lower plastic structure further includes an explosion-proof protrusion (40) and at least one explosion-proof hole (50), the explosion-proof protrusion (40) is located on the first surface (22) and forms an explosion-proof area for accommodating an explosion-proof valve, the explosion-proof hole (50) is located within the explosion-proof area and penetrates the first split part (10).

13. The lower plastic structure according to claim 12, wherein, The sum of the areas of all the explosion-proof holes (50) is greater than or equal to the product of the explosion-proof valve opening area, the pressure relief rate, and the safety factor.

14. The lower plastic structure according to claim 12, wherein, The explosion-proof protrusion (40) and the rib (11) are flush with the surface away from the first surface (22).

15. The lower plastic structure according to claim 12, wherein, The explosion-proof hole (50) and the explosion-proof protrusion (40) are located in at least one of the recesses (13), and the protruding rib (11) at the edge of the recess (13) that accommodates the explosion-proof hole (50) and the explosion-proof protrusion (40) is provided with an explosion-proof notch (111), which penetrates the inner and outer sides of the recess (13).

16. A battery top cover, comprising a top cover sheet (60) and a lower plastic structure according to any one of claims 1 to 15, wherein the top cover sheet (60) and the lower plastic structure are stacked, and a positioning post (24) of the lower plastic structure extends into a blind hole (61) of the top cover sheet (60).

17. A battery comprising a cell, a terminal post (70), and a battery top cover as claimed in claim 16, the battery top cover covering the cell, the lower plastic structure of the battery top cover having a through-hole (17) for the terminal post, the terminal post (70) being disposed between the lower plastic structure and the top cover sheet (60) and located at the terminal post hole (17), the lead (80) of the cell being embedded in a receiving groove below the lower plastic structure and located at the terminal post hole (17), the terminal post (70) being electrically connected to the tab of the cell through the lead (80).

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