Lower plastic plate, battery top cover and battery

Abstract

This invention provides a lower plastic sheet, a battery top cover, and a battery. The lower plastic sheet includes a plastic sheet body, a first support portion, and a second support portion. The plastic sheet body has an injection channel. The first and second support portions are respectively located at both ends of the plastic sheet body along its length and abut against the core near its edge to create a gap between the plastic sheet body and the core, forming a liquid cavity. The injection channel communicates with the liquid cavity. At least one of the first and second support portions has an inlet channel communicating with the liquid cavity. At least a portion of the outlet of the inlet channel is offset from the core in the thickness direction of the plastic sheet body to form an electrolyte wetting channel between the injection channel, the liquid cavity, and the inlet channel. The lower plastic sheet of this invention has the advantages of improving the uniformity of core wetting, battery cycle performance, and processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to a lower plastic sheet, a battery top cover having the lower plastic sheet, and a battery. Background Technology

[0002] A power battery typically includes a top cover, a core, an outer casing, and a lower plastic plate. The core is located inside the outer casing, and an electrode plate extends from the top of the core and connects to the terminal post fixed on the top cover. The lower plastic plate is installed between the top cover and the top of the core, and the top cover and the core are insulated and separated by the lower plastic plate.

[0003] In related technologies, the electrolyte injection channel is located in the area near the middle of the core. During injection or replenishment, due to the small gap between the top cover and the core, the limiting structure of the lower plastic plate (first support and second support) presses down on the diaphragm, causing the electrolyte to be unable to flow directly into both sides of the core through the gap between the lower plastic plate and the core, resulting in a slow injection speed. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related art. To this end, embodiments of the invention provide a lower plastic sheet. This lower plastic sheet has the advantages of improving the uniformity of core impregnation and the cycle performance of the battery.

[0005] An embodiment of the present invention also proposes a battery top cover.

[0006] An embodiment of the present invention also proposes a battery.

[0007] The lower plastic sheet in this embodiment of the invention includes a plastic sheet body, a first support portion, and a second support portion.

[0008] The plastic sheet has a first side and a second side disposed opposite to each other along its thickness direction. The first side is used to connect with the top cover plate. The plastic sheet is provided with a liquid injection channel. The first support and the second support are respectively disposed at both ends of the plastic sheet in the length direction and can abut against the area near the edge of the core so that there is a gap between the plastic sheet and the core to form a liquid cavity. The liquid injection channel communicates with the liquid cavity. At least one of the first support and the second support is provided with a liquid inlet channel communicating with the liquid cavity. At least a portion of the liquid outlet of the liquid inlet channel can be offset from the core in the thickness direction of the plastic sheet so that the liquid injection channel, the liquid cavity and the liquid inlet channel form an electrolyte wetting channel.

[0009] In this embodiment of the invention, the lower plastic sheet has an inlet channel communicating with a liquid cavity on at least one of the first and second support portions. At least a portion of the outlet of the inlet channel can be offset from the core in the thickness direction of the plastic sheet to form an inlet channel. The inlet channel, the liquid cavity, and the inlet channel on the plastic sheet form an electrolyte wetting channel. The electrolyte can be directly fed from the diaphragm portion pressed by the first and second support portions into the space between the core and the outer shell through the formed wetting channel. This avoids the edge of the core being blocked from the flow of electrolyte due to the pressure of the support portions (first and second support portions) on the core diaphragm, thus improving the electrolyte injection speed and the uniformity of core wetting, which is beneficial to improving the cycle performance and processing efficiency of the battery.

[0010] Therefore, the lower plastic sheet of the present invention has the advantages of improving the uniformity of core impregnation, battery cycle performance and processing efficiency.

[0011] In some embodiments, at least one of the first support portion and the second support portion has a liquid inlet on the side wall of the side connected to the plastic sheet body, and the liquid inlet of the liquid inlet is in communication with the liquid cavity.

[0012] In some embodiments, at least one of the first support portion and the second support portion is provided with a liquid receiving tank having an opening on a first side, the liquid receiving tank extending along the thickness direction of the plastic sheet body, the drain outlet of the liquid inlet channel being disposed on the bottom wall of the liquid receiving tank, and the inlet of the liquid inlet channel being disposed on the side wall of the liquid receiving tank.

[0013] In some embodiments, both the first support portion and the second support portion include a connecting wall and a supporting bottom wall. The supporting bottom wall is capable of abutting against the region of the core near the edge. The connecting wall and the supporting bottom wall form the liquid receiving tank. One side of the connecting wall is connected to the plastic sheet body. The drain port of the liquid inlet channel is opened on the supporting bottom wall, and the inlet of the liquid inlet channel is located on the side of the connecting wall connected to the plastic sheet body.

[0014] In some embodiments, the core has multiple layers, and adjacent cores have liquid inlet gaps extending along the thickness direction of the plastic sheet. The liquid inlet channel has multiple drain ports, which are spaced apart on the support bottom wall along the width direction of the plastic sheet. The hydraulic diameter of the drain port corresponding to the liquid inlet gap in the thickness direction of the plastic sheet is larger than the hydraulic diameter of the other drain ports.

[0015] In some embodiments, the lower plastic plate further includes a reinforcing rib, which is connected between the supporting bottom wall of the liquid receiving tank and the side wall of the liquid receiving tank.

[0016] In some embodiments, the inlet of the liquid inlet channel is located in the region of the connecting wall near the supporting bottom wall.

[0017] In some embodiments, the first side of the plastic sheet has one of a limiting protrusion and a limiting groove, and one of the limiting protrusion and the limiting groove of the plastic sheet can cooperate with the other of the limiting protrusion and the limiting groove on the top cover plate.

[0018] In some embodiments, the lower plastic sheet further includes a limiting edge extending along the edge of the second side of the plastic sheet body toward the side closer to the core.

[0019] In some embodiments, the plastic sheet body includes a first plastic partition and a second plastic partition arranged sequentially along the length direction of the lower plastic sheet, and the first support portion and the second support portion are correspondingly arranged on the first plastic partition and the second plastic partition, and the first plastic partition and the second plastic partition are arranged at a distance.

[0020] In some embodiments, the lower plastic sheet further includes a recessed plate portion and a third support portion. The recessed plate portion is disposed on the second side of the first plastic sheet, and the third support portion is disposed on the second side of the second plastic sheet. The third support portion can abut against the core, and the third support portion and the second support portion are connected to the second plastic sheet at a distance along the length direction of the plastic sheet body. The sidewalls of the first plastic sheet and the sidewalls of the second plastic sheet abut against each other.

[0021] In some embodiments, the substrate is provided with a recessed groove having an opening facing the first side, and the drain outlet of the injection channel is provided on the side wall and / or bottom wall of the recessed groove so as to form the injection channel on the substrate.

[0022] In some embodiments, the recessed portion of the plastic sheet is integrally formed with the first plastic partition plate.

[0023] In some embodiments, the first support portion is integrally formed with the first plastic partition.

[0024] In some embodiments, the second support portion is integrally formed with the second plastic partition.

[0025] In some embodiments, the third support portion is integrally formed with the second plastic panel.

[0026] The battery top cover of this invention may include a top cover plate and a lower plastic plate as described in any of the above embodiments. The lower plastic plate is attached to the top cover plate, and the top cover plate is provided with a top cover liquid injection port corresponding to the liquid injection channel. The top cover liquid injection port is in communication with the liquid injection channel.

[0027] In some embodiments, the battery top cover of the present invention further includes a sealing pin, the sealing pin including a connected head and a body portion, a cover plate groove is provided in the area of ​​the top cover plate opposite to the liquid injection channel, the liquid injection port is opened on the bottom wall of the cover plate groove, the body portion passes through the liquid injection channel and the liquid injection port, the head portion can abut against the bottom wall of the cover plate groove, the plastic structure of the top cover further includes a rubber plate recessed portion, the rubber plate recessed portion is provided with a recessed groove having an opening facing the first side, the liquid injection channel drain port is provided on the side wall and bottom wall of the recessed groove, and the cross-sectional area of ​​the drain port located on the bottom wall of the recessed groove is larger than the cross-sectional area of ​​the body portion.

[0028] The battery of this invention includes an outer shell, a core, and a top cover as described above. The core is disposed inside the outer shell, and a lower plastic plate is disposed between the core and the top cover. The first support portion and the second support portion abut against one end of the core in the height direction. The plastic plate is spaced apart from the core to form a liquid cavity. At least one of the first support portion and the second support portion is provided with a liquid inlet channel communicating with the liquid cavity. At least a portion of the liquid outlet of the liquid inlet channel can be offset from the core in the thickness direction of the plastic plate to form an electrolyte wetting channel between the liquid inlet channel, the liquid cavity, and the liquid inlet channel.

[0029] In some embodiments, the core has multiple layers, and adjacent cores are separated by a liquid inlet gap extending along the thickness direction of the plastic body. The liquid inlet channel has multiple drain ports, which are spaced apart on the support base plate along the width direction of the plastic body. The hydraulic diameter of the drain port corresponding to the liquid inlet gap in the thickness direction of the plastic body is larger than the hydraulic diameter of the other drain ports. The drain ports of the liquid inlet channel corresponding to the liquid inlet gap are also corresponding to the liquid inlet gap in the thickness direction of the plastic body. Attached Figure Description

[0030] Figure 1 This is a perspective view of the lower plastic sheet according to an embodiment of the present invention.

[0031] Figure 2 yes Figure 1 A magnified view of point A in the image.

[0032] Figure 3 This is another perspective view of the lower plastic sheet according to an embodiment of the present invention.

[0033] Figure 4 yes Figure 3 A magnified view at point B.

[0034] Figure 5 This is a bottom view of the lower plastic sheet according to an embodiment of the present invention.

[0035] Figure 6 This is a top view of the lower plastic sheet according to an embodiment of the present invention.

[0036] Figure 7 This is a perspective view of the first plastic sheet in an embodiment of the present invention.

[0037] Figure 8 This is a perspective view of the second plastic sheet in an embodiment of the present invention.

[0038] Figure 9 This is a front view of the battery top cover according to an embodiment of the present invention.

[0039] Figure 10 This is a front view of the battery according to an embodiment of the present invention.

[0040] Figure 11 This is a schematic diagram of the assembly of the winding core and the battery top cover according to an embodiment of the present invention.

[0041] Figure 12 yes Figure 11 A magnified view at point C.

[0042] Figure label:

[0043] Battery top cover 100; winding core 200; outer casing 300;

[0044] Lower plastic sheet 10; Top cover 20;

[0045] Plastic sheet body 1;

[0046] Injection channel 11; electrode post hole 12; positive electrode post hole 121; negative electrode post hole 122;

[0047] First plastic panel 13; Second plastic panel 14;

[0048] First support part 2; liquid inlet 21 of liquid inlet channel; liquid outlet 22 of liquid inlet channel;

[0049] Second support section 3;

[0050] Liquid receiving tank 4; supporting bottom wall 41; connecting wall 42;

[0051] Reinforcing rib 5;

[0052] Limiting protrusion 6;

[0053] Limit along edge 7;

[0054] 8. Glue plate recessed platform; 9. Third support section. Detailed Implementation

[0055] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0056] The following is for reference. Figures 1-12 The invention describes a lower plastic plate 10, a battery top cover 100 having the lower plastic plate 10, and a battery, according to an embodiment of the invention.

[0057] The lower plastic plate 10 of this embodiment of the invention includes a plastic plate body 1, a first support part 2, and a second support part 3.

[0058] The plastic sheet 1 has a first side disposed opposite to the first side along its thickness direction (e.g., Figure 1 and Figure 10 The upper surface shown) and the second side (e.g., Figure 1 and Figure 10 The lower surface shown in the figure), the first side is used to attach to the top cover plate 20, the plastic plate body 1 is provided with an injection channel 11 and an electrode hole 12, the first support part 2 and the second support part 3 are respectively provided at both ends in the length direction of the plastic plate body 1, and can abut against the area near the edge of the core 200 so that there is a gap between the plastic plate body 1 and the core 200 (e.g., Figure 10 (As shown in the diagram) to form a liquid cavity, the injection channel 11 communicates with the liquid cavity, and at least one of the first support portion 2 and the second support portion 3 is provided with an inlet channel communicating with the liquid cavity. At least a portion of the outlet 22 of the inlet channel can be offset from the core 200 in the thickness direction of the plastic sheet 1 so as to form an electrolyte wetting channel between the injection channel 11, the liquid cavity, and the inlet channel. It can be understood that the inlet of the inlet channel is located near the edge of the core 200.

[0059] In this embodiment of the invention, the lower plastic plate 10 has an inlet channel communicating with the liquid cavity on at least one of the first support portion 2 and the second support portion 3. At least a portion of the outlet 22 of the inlet channel can be offset from the core 200 in the thickness direction of the plastic plate body 1 to form an injection channel 11. The injection channel 11, the liquid cavity and the inlet channel on the plastic plate body 1 form an electrolyte wetting channel. The electrolyte can be directly injected from the diaphragm portion pressed by the first support portion 2 and the second support portion 3 into the space between the core 200 and the outer shell 300 through the formed wetting channel. This avoids the edge of the core 200 from being blocked from the flow of electrolyte by the support portion (first support portion 2 and second support portion 3) pressing the diaphragm of the core 200. This improves the electrolyte injection speed and the uniformity of the core 200 wetting, which is beneficial to improving the cycle performance and processing efficiency of the battery.

[0060] Therefore, the lower plastic sheet 10 of the present invention has the advantages of improving the uniformity of impregnation of the core 200, the cycle performance of the battery, and the processing efficiency.

[0061] Specifically, the upper surface of the plastic sheet 1 is attached to the lower surface of the top cover plate 20. The upper surface of the plastic sheet 1 and the upper end face of the core 200 are positioned opposite each other in the vertical direction.

[0062] The plastic sheet body 1 is also provided with pole hole 12.

[0063] like Figure 1 and Figure 3 As shown, at least one of the first support part 2 and the second support part 3 has a liquid inlet 21 on the side wall of the side connected to the plastic plate body 1, and the liquid inlet is connected to the liquid cavity.

[0064] In this embodiment of the invention, the lower plastic plate 10 has its liquid inlet 21 located on the side wall of at least one of the first support portion 2 and the second support portion 3 connected to the plastic plate body 1. (In related technologies, this side wall abuts against the diaphragm of the core 200, forming a gap that prevents electrolyte from flowing into the adjacent core 200. During injection, the electrolyte tends to flow from the periphery of the module into the outer shell 300, but due to the extremely limited gap between the module and the outer shell 300, the electrolyte injection speed is slow.) This allows the electrolyte in the liquid cavity to be directly injected into the outer shell 300 from this location, greatly improving the injection speed and reducing the difficulty of setting the liquid inlet 21 of the liquid inlet channel. Therefore, it has the advantage of improving injection efficiency.

[0065] like Figure 1 and Figure 3As shown, at least one of the first support portion 2 and the second support portion 3 is provided with a liquid receiving tank 4 having an opening on a first side. The liquid receiving tank 4 extends along the thickness direction of the plastic sheet body 1. The drain port 22 of the liquid inlet channel is provided on the bottom wall 41 of the liquid receiving tank 4, and the inlet port 21 of the liquid inlet channel is provided on the side wall of the liquid receiving tank 4. In other words, the first support portion 2 is provided with a liquid receiving tank 4, or the second support portion 3 is provided with a liquid receiving tank 4; or, both the first support portion 2 and the second support portion 3 are provided with liquid receiving tanks 4.

[0066] In this embodiment of the invention, the lower plastic plate 10 has a liquid-receiving groove 4 with an opening on the first side on at least one of the first support portion 2 and the second support portion 3, which can accommodate a portion of the electrolyte. This helps to keep the pressed portion of the core 200 constantly wetted, improving the space utilization rate inside the battery. Furthermore, the liquid-receiving groove 4 reduces the overall weight of the lower plastic plate 10, thus increasing the energy density of the core 200.

[0067] Optionally, the liquid receiving tank 4 extends along the thickness direction of the plastic sheet 1, and the liquid receiving tank 4 is opened on the first support part 2 and the second support part 3. The liquid inlet of the liquid inlet channel is located on the side wall of the first support part 2 and the second support part 3 connected to the plastic sheet 1, and the liquid inlet of the liquid inlet channel is connected to the liquid receiving tank 4.

[0068] like Figure 3 and Figure 4 As shown, both the first support part 2 and the second support part 3 include a support bottom wall 41 and a connecting wall 42. The support bottom wall 41 can abut against the area near the edge of the core 200. The connecting wall 42 and the support bottom wall 41 form a liquid receiving tank 4. One side of the connecting wall 42 is connected to the plastic sheet 1. The drain port 22 of the liquid inlet channel is opened on the support bottom wall 41. The liquid inlet 21 of the liquid inlet channel is located on the side where the connecting wall 42 is connected to the plastic sheet 1.

[0069] In this embodiment of the invention, the lower plastic plate 10, by placing the liquid inlet 21 of the liquid inlet channel on the side where the connecting wall 42 connects to the plastic plate body 1, reduces the difficulty of opening the liquid inlet of the liquid inlet channel, allowing the electrolyte in the liquid cavity to flow into the liquid inlet channel. This results in a simple structure. Furthermore, it ensures that the edge of the core 200 corresponding to the liquid inlet remains constantly wetted. This further improves the battery's capacity and cycle life.

[0070] like Figure 3 and Figure 4 As shown, the liquid inlet 21 of the liquid inlet channel is located in the area of ​​the connecting wall 42 near the supporting bottom wall 41.

[0071] In this embodiment of the invention, the lower plastic plate 10 is positioned in the region of the connecting wall 42 near the supporting bottom wall 41 via the liquid inlet 21 of the liquid inlet channel. This allows the electrolyte to flow from the liquid cavity into the liquid inlet channel in a timely manner, preventing electrolyte accumulation in the liquid cavity and reducing the electrolyte flow rate.

[0072] Specifically, such as Figure 1 and Figure 3 As shown, the supporting bottom wall 41 is provided with multiple liquid inlet channels and drain ports 22. Some of the multiple drain ports can be arranged corresponding to the core 200 in the thickness direction of the core 200 on the plastic sheet body 1, so that the electrolyte can flow into the core 200. Therefore, it has the advantage of good wetting effect of the core 200.

[0073] Optionally, the first support 2 and the second support 3 may each have multiple liquid inlets.

[0074] Furthermore, the lower plastic sheet 10 can be injection molded to corresponding positions of the first support portion 2 and the second support portion 3 to form corresponding liquid receiving grooves 4. It is understood that a portion of the lower surface of the first support portion 2 protrudes downward relative to the remainder of the first support portion 2 to form the first support portion 2, and a portion of the upper surface of the first support portion 2 is recessed downward relative to the remainder of the first support portion 2 to form the first liquid receiving groove. Similarly, a portion of the lower surface of the second support portion 3 protrudes downward relative to the remainder of the second support portion 3 to form the second support portion 3, and a portion of the upper surface of the second support portion 3 is recessed downward relative to the remainder of the second support portion 3 to form the second liquid receiving groove. This provides the advantage of high processing convenience.

[0075] like Figure 1 and Figure 3 As shown, there are multiple cores 200, which are stacked and arranged in layers. There is a liquid inlet gap between adjacent cores 200 extending along the thickness direction of the plastic sheet 1. There are multiple drain ports 22 of the liquid inlet channel, which are spaced apart on the support bottom wall 41 along the width direction of the plastic sheet 1. The hydraulic diameter of the drain port corresponding to the liquid inlet gap in the thickness direction of the plastic sheet 1 is larger than the hydraulic diameter of the other drain ports.

[0076] In this embodiment of the invention, the lower plastic plate 10 has a drain port with a hydraulic diameter that is larger than that of other drain ports in the thickness direction of the plastic plate body 1, which corresponds to the liquid inlet gap. This allows most of the electrolyte to flow into the outer shell 300 through the drain port corresponding to the liquid inlet gap. The electrolyte flowing in from this drain port is unobstructed, which has the advantage of increasing the electrolyte flow rate.

[0077] The lower plastic sheet 10 also includes a reinforcing rib 5, which connects the supporting bottom wall 41 of the liquid receiving tank 4 and the side wall of the liquid receiving tank 4. Therefore, the lower plastic sheet 10 has the advantage of high structural strength.

[0078] Furthermore, such as Figure 1 and Figure 3 As shown, there are multiple reinforcing ribs 5, which are spaced apart along the width direction of the plastic sheet 1. This further enhances the structural strength of the lower plastic sheet 10.

[0079] like Figure 1 and Figure 3 As shown, the first side of the plastic sheet 1 has one of a limiting protrusion 6 and a limiting groove so that it can cooperate with the other of the limiting protrusion 6 and the limiting groove on the cover plate. In other words, the first side of the plastic sheet 1 has a limiting protrusion 6, and the top cover plate 20 has a limiting groove. Or the first side of the plastic sheet 1 has a limiting groove, and the top cover plate 20 has a limiting protrusion 6, which engages in the limiting groove.

[0080] In this embodiment of the invention, the lower plastic plate 10 has one of a limiting protrusion 6 and a limiting groove on the first side of the plastic plate body 1, which mates with the other of the limiting protrusion 6 and the limiting groove on the top cover plate 20. This prevents the lower plastic plate 10 from shifting and improves the stability of the fit between the top cover plate 20 and the lower plastic plate 10.

[0081] like Figure 1 and Figure 7 As shown, the lower plastic sheet 10 also includes a limiting edge 7, which extends along the edge of the second side of the plastic sheet body 1 toward the side close to the core 200, and the limiting edge 7 abuts against the outer side wall of the core 200. The core 200 is thus limited by the limiting edge 7. This improves the stability of the fit between the core 200 and the lower plastic sheet 10.

[0082] For example, Figure 1 and Figure 10 As shown, a limiting edge 7 is provided on the lower surface of the plastic sheet 1, and the limiting edge 7 extends along... Figure 3 The front and back directions are set relative to each other as shown.

[0083] like Figure 1 and Figure 7As shown, the plastic plate body 1 includes a first plastic plate 13 and a second plastic plate 14 arranged sequentially along the length direction of the lower plastic plate 10. A first support part 2 and a second support part 3 are correspondingly arranged on the first plastic plate 13 and the second plastic plate 14. The first plastic plate 13 and the second plastic plate 14 are arranged at intervals. The electrode hole 12 includes a positive electrode hole 121 and a negative electrode hole 122. The positive electrode hole 121 is arranged on the first plastic plate 13, and the negative electrode hole 122 is arranged on the second plastic plate 14.

[0084] In this embodiment of the invention, the lower plastic plate 10 is divided into a first plastic partition 13 and a second plastic partition 14, which are separated from each other. Because the lower plastic plate 10 expands and contracts with changes in temperature, it effectively reduces the loosening of the seal caused by deformation, avoiding problems such as high plastic tension and bending deformation, and preventing air or liquid leakage caused by loosening of the sealing ring. This improves the yield rate of battery production.

[0085] Optionally, the interval between the first plastic partition 13 and the second plastic partition 14 is 1mm-2mm.

[0086] Optionally, the periphery of the positive electrode hole 121 of the first plastic partition 13 protrudes upward and mates with the top cover plate 20, and the periphery of the negative electrode hole 122 of the second plastic partition 14 protrudes upward and mates with the top cover plate 20.

[0087] Specifically, both the first plastic partition 13 and the second plastic partition 14 have limiting edges 7. Furthermore, the limiting edges 7 can be arranged opposite each other along the width direction of the first plastic partition 13 to prevent the first plastic partition 13 from contacting the core 200. Figure 1 The front-to-back displacement is shown in the diagram.

[0088] The lower plastic sheet 10 of this embodiment of the invention further includes a plastic sheet recessed platform and a third support 9. The plastic sheet recessed platform is disposed on the second side of the first plastic sheet, and the third support 9 is disposed on the second side of the second plastic sheet 14. The third support 9 can abut against the core 200, and the third support 9 and the second support 3 are connected to the second plastic sheet 14 at a distance along the length direction of the plastic sheet body 1. The side wall of the first plastic sheet 13 and the side wall of the second plastic sheet 14 abut against each other.

[0089] In this embodiment of the invention, the lower plastic plate 10 is provided on the second plastic partition 14 at a distance from the second support portion 3 along the length direction of the plastic plate body 1 via the third support portion 9 and the second support portion 3. The side walls of the first plastic partition 13 and the second plastic partition 14 abut against each other, which can make the first plastic partition 13 and the second plastic partition 14 play a stable supporting role and prevent the first plastic partition 13 and the second plastic partition 14 from tilting due to unbalanced force.

[0090] like Figure 1 and Figure 3 As shown, the rubber sheet settling section 8 is provided with a settling groove with an opening facing the first side, and the drain port of the liquid injection channel 11 is provided on the side wall and / or bottom wall of the settling groove so as to form a liquid injection channel 11 on the rubber sheet settling section 8.

[0091] In this embodiment of the invention, the lower plastic sheet 10 has an injection channel 11 formed by a recessed groove provided on the recessed portion 8 of the sheet, and the drain outlet of the injection channel 11 is provided on the side wall and / or bottom wall of the recessed groove. Therefore, the length of the injection channel 11 can be increased, thereby improving the stability of the injection.

[0092] like Figure 1 and Figure 3 As shown, the rubber sheet recessed platform 8 and the first plastic partition 13 are integrally formed. Therefore, it has the advantage of good structural integrity.

[0093] like Figure 1 and Figure 3 As shown, the first support part 2 and the first plastic partition 13 are integrally formed. Therefore, it has the advantage of good structural integrity.

[0094] like Figure 1 and Figure 3 As shown, the second support part 3 and the second plastic partition 14 are integrally formed; thus, it has the advantage of good structural integrity.

[0095] like Figure 1 and Figure 3 As shown, the third support part 9 and the second plastic panel 14 are integrally formed. Therefore, it has the advantage of good structural integrity.

[0096] like Figure 9 As shown, the battery top cover 100 according to an embodiment of the present invention includes a top cover plate 20 and a lower plastic plate 10 as described above. The lower plastic plate 10 is attached to the top cover plate 20, and the top cover plate 20 is provided with an injection port corresponding to the injection channel 11. Therefore, the battery top cover 100 of the present invention has the advantages of improving the uniformity of wetting of the core 200, the cycle performance of the battery, and the processing efficiency.

[0097] The battery top cover 100 of this embodiment of the invention also includes a sealing pin, which includes a connected head and a main body. The area of ​​the top cover plate 20 opposite to the liquid injection channel 11 is provided with a cover plate groove. The liquid injection port is opened on the bottom wall of the cover plate groove. The main body passes through the liquid injection channel 11 and the liquid injection port. The head can abut against the bottom wall of the cover plate groove. The cross-sectional area of ​​the drain port located on the bottom wall of the groove is larger than the cross-sectional area of ​​the main body.

[0098] The battery top cover 100 of this embodiment of the invention, through the provided sealing pins, can seal the liquid cavity after liquid filling, preventing electrolyte leakage and thus extending service life. Furthermore, the clearance fit of the main body within the liquid filling channel 11 enhances the applicability of the sealing pins. Therefore, it offers the advantage of high ease of use.

[0099] Optionally, the cross-sectional area of ​​the main body decreases from its free end to its head.

[0100] like Figures 10 to 12 As shown, the battery according to an embodiment of the present invention includes an outer casing 300, a core 200, and the aforementioned battery top cover 100. The core 200 is disposed inside the outer casing 300, and a lower plastic plate 10 is disposed between the core 200 and the top cover 20. A first support portion 2 and a second support portion 3 abut against one end of the core 200. The plastic plate 1 is spaced apart from the core 200 to form a liquid cavity. At least one of the first support portion 2 and the second support portion 3 is provided with a liquid inlet channel communicating with the liquid cavity. At least a portion of the liquid outlet 22 of the liquid inlet channel can be offset from the core 200 in the thickness direction of the plastic plate 1 to form an electrolyte wetting channel between the liquid injection channel 11, the liquid cavity, and the liquid inlet channel. Therefore, the battery of the present invention has the advantage of good cycle performance.

[0101] Optionally, there are multiple cores 200, which are stacked and have liquid inlet gaps extending along the thickness direction of the plastic sheet 1 between adjacent cores 200. There are multiple drain ports 22 of the liquid inlet channel, which are spaced apart on the support bottom wall 41 along the width direction of the plastic sheet 1. The hydraulic diameter of the drain port corresponding to the liquid inlet gap in the thickness direction of the plastic sheet 1 is larger than the hydraulic diameter of the other drain ports. The drain port corresponding to the liquid inlet gap in the thickness direction of the plastic sheet 1 is offset from the core 200 in the thickness direction of the plastic sheet 1.

[0102] In the battery pack of this invention, the hydraulic diameter of the drain port of the liquid inlet channel, which is set in the thickness direction of the plastic plate 1 corresponding to the liquid inlet gap, is larger than the hydraulic diameter of other drain ports. The drain port of the liquid inlet gap, which is set in the thickness direction of the plastic plate 1, is offset from the core 200 in the thickness direction of the plastic plate 1. This allows most of the electrolyte to flow into the outer shell 300 through the drain port corresponding to the liquid inlet gap. The electrolyte flowing in from the drain port of the liquid inlet channel is unobstructed, which has the advantage of further improving the speed of electrolyte flow.

[0103] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0104] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0105] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0106] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0107] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0108] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A type of lower plastic sheet, characterized in that, The lower plastic sheet is used to separate the core and the top cover plate, and the lower plastic sheet includes: A plastic sheet body, the plastic sheet body having a first side and a second side disposed opposite to each other along its thickness direction, the first side being used to connect with the top cover plate, and the plastic sheet body being provided with a liquid injection channel; A first support portion and a second support portion are respectively disposed at both ends of the plastic sheet body along its length direction and can abut against the area near the edge of the core to create a gap between the plastic sheet body and the core to form a liquid cavity. The injection channel communicates with the liquid cavity. The first support portion and the second support portion are provided with an inlet channel communicating with the liquid cavity. Viewed from above or below the thickness direction of the plastic sheet body, at least a portion of the drain port of the inlet channel can be offset from the core to form an electrolyte wetting channel between the injection channel, the liquid cavity, and the inlet channel. Both the first support portion and the second support portion include a connecting wall and a supporting bottom wall. The supporting bottom wall can abut against the area near the edge of the core. There are multiple cores, which are stacked and arranged in layers. There is a liquid inlet gap between adjacent cores that extends along the thickness direction of the plastic sheet. There are multiple drain ports of the liquid inlet channel. The multiple drain ports are spaced apart on the supporting bottom wall along the width direction of the plastic sheet. The hydraulic diameter of the drain port corresponding to the liquid inlet gap in the thickness direction of the plastic sheet is larger than the hydraulic diameter of the other drain ports. When viewed from above or below the thickness direction of the plastic sheet, the drain port corresponding to the liquid inlet gap in the thickness direction of the plastic sheet is misaligned with the core. The connecting wall and the supporting bottom wall form a liquid receiving tank with an opening on the first side. The connecting wall is provided with the liquid inlet of the liquid inlet channel, which is located on the side where the connecting wall connects to the plastic sheet.

2. The lower plastic sheet according to claim 1, characterized in that, It also includes a reinforcing rib, which is connected between the supporting bottom wall of the liquid receiving tank and the side wall of the liquid receiving tank; And / or, the inlet of the liquid inlet channel is located in the area of ​​the connecting wall near the supporting bottom wall.

3. The lower plastic sheet according to claim 1, characterized in that, The first side of the plastic sheet has one of a limiting protrusion and a limiting groove, and one of the limiting protrusion and the limiting groove of the plastic sheet can cooperate with the other of the limiting protrusion and the limiting groove on the top cover plate. And / or, it also includes a limiting edge extending along the edge of the second side of the plastic sheet toward the side closer to the core.

4. The lower plastic sheet according to any one of claims 1-3, characterized in that, The plastic sheet body includes a first plastic partition and a second plastic partition arranged sequentially along the length direction of the lower plastic sheet. The first support portion and the second support portion are correspondingly arranged on the first plastic partition and the second plastic partition, and the first plastic partition and the second plastic partition are arranged at intervals.

5. The lower plastic sheet according to claim 4, characterized in that, It also includes a rubber sheet recessed platform and a third support portion. The rubber sheet recessed platform is disposed on the second side of the first plastic sheet, and the third support portion is disposed on the second side of the second plastic sheet. The third support portion can abut against the core, and the third support portion and the second support portion are connected to the second plastic sheet at a distance along the length direction of the plastic sheet body. The sidewalls of the first plastic sheet and the sidewalls of the second plastic sheet abut against each other.

6. The lower plastic sheet according to claim 5, characterized in that, The substrate is provided with a recessed groove that has an opening facing the first side. The drain outlet of the injection channel is provided on the side wall and / or bottom wall of the recessed groove so as to form the injection channel on the substrate.

7. The lower plastic sheet according to claim 5, characterized in that, The recessed section of the rubber sheet is integrally formed with the first plastic sheet. And / or, the first support portion is integrally formed with the first plastic panel; And / or, the second support portion is integrally formed with the second plastic panel; And / or, the third support portion is integrally formed with the second plastic panel.

8. A battery top cover, characterized in that, It includes a top cover plate and a lower plastic plate according to any one of claims 1-7, the lower plastic plate being attached to the top cover plate, the top cover plate being provided with a top cover injection port corresponding to the injection channel, and the top cover injection port communicating with the injection channel.

9. The battery top cover according to claim 8, characterized in that, It also includes a sealing pin, which includes a connected head and a main body. The area of ​​the top cover plate opposite to the injection channel is provided with a cover plate groove. The injection port is opened on the bottom wall of the cover plate groove. The main body passes through the injection channel and the injection port. The head can abut against the bottom wall of the top cover plate. The plastic structure of the top cover also includes a rubber plate recessed platform. The rubber plate recessed platform is provided with a recessed platform groove with an opening facing the first side. The drain port of the injection channel is provided on the side wall and bottom wall of the recessed platform groove. The cross-sectional area of ​​the drain port located on the bottom wall of the recessed platform groove is larger than the cross-sectional area of ​​the main body.

10. A battery, characterized in that, The battery includes an outer shell, a core, and a top cover according to claim 8 or 9. The core is disposed inside the outer shell, and the lower plastic plate is disposed between the core and the top cover. The first support portion and the second support portion abut against one end of the core in the height direction. The plastic plate is spaced apart from the core to form a liquid cavity. At least one of the first support portion and the second support portion is provided with a liquid inlet channel communicating with the liquid cavity. Viewed from above or below the thickness direction of the plastic plate, at least a portion of the drain port of the liquid inlet channel can be misaligned with the core to form an electrolyte wetting channel between the liquid injection channel, the liquid cavity, and the liquid inlet channel.

11. The battery according to claim 10, characterized in that, The roll core has multiple layers, and adjacent roll cores have liquid inlet gaps extending along the thickness direction of the plastic sheet. The liquid inlet channel has multiple drain ports, which are spaced apart on the support base plate along the width direction of the plastic sheet. The hydraulic diameter of the drain port corresponding to the liquid inlet gap in the thickness direction of the plastic sheet is larger than the hydraulic diameter of the other drain ports. The drain ports of the liquid inlet channel corresponding to the liquid inlet gap are also corresponding to the liquid inlet gap in the thickness direction of the plastic sheet.

Images