Lower plastic structure, end cover assembly and energy storage device

Abstract

The utility model discloses a lower plastic cement structure, an end cover assembly and an energy storage device, and the lower plastic cement structure comprises a lower plastic cement body, a supporting cushion layer, and a plurality of protrusions. A pole through hole is formed in the lower plastic body; the supporting cushion layer surrounds the pole through hole and is convexly arranged on the upper surface of the lower plastic body; the plurality of bulges are annularly arranged on the inner wall of the supporting cushion layer and extend towards the axis direction of the pole through hole; a circulation gap is formed between every two adjacent protrusions. A groove is formed in the upper surface of one end, facing the pole through hole, of the bulge so as to communicate two adjacent circulation gaps. Through the arrangement, the failure rate of the sealing ring is reduced, so that the running stability of the device is improved, the utilization rate of electrolyte can be improved, and the waste of resources is avoided.

Description

Technical Field

[0001] The utility model relates to the field of energy storage devices, in particular to a lower plastic structure, an end cover assembly and an energy storage device. Background Art

[0002] Research has found that during the use of lithium-ion batteries, the electrolyte will accumulate in the interlayer between the pole and the lower plastic due to volatilization or external shaking during use, which will cause a part of the electrolyte to not participate in the electrochemical reaction and cause waste. In addition, since the electrolyte accumulated in the interlayer between the pole and the lower plastic is in contact with the sealing ring for a long time, it will cause the sealing ring to corrode and fail, causing the pole to leak, resulting in battery failure.

[0003] Therefore, a lower plastic structure, an end cover assembly and an energy storage device are needed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a lower plastic structure, an end cover assembly and an energy storage device to reduce the failure rate of the sealing ring and improve the utilization rate of the electrolyte.

[0005] In order to solve the above technical problems, the utility model provides a lower plastic structure, including a lower plastic body, a support cushion layer and a plurality of protrusions;

[0006] The lower plastic body is provided with a pole through hole;

[0007] The support pad surrounds the pole through hole and is convexly disposed on the upper surface of the lower plastic body;

[0008] The plurality of protrusions are arranged in an annular shape on the inner wall of the support pad layer and extend toward the axial direction of the pole through hole;

[0009] A flow gap is formed between two adjacent protrusions;

[0010] A groove is arranged on the upper surface of one end of the protrusion facing the pole through hole to connect two adjacent flow gaps.

[0011] Furthermore, the protrusion is configured as a stepped structure to form the groove.

[0012] Furthermore, a top wall of the protrusion on a side away from the pole through hole is flush with an upper surface of the supporting pad layer.

[0013] Furthermore, the flow gap is trapezoidal, and the corresponding central angle α is 10°-30°.

[0014] Furthermore, the protrusions are all arranged as a trapezoidal structure, so that a trapezoidal flow gap is formed between two adjacent protrusions.

[0015] Furthermore, the number of the flow gaps is an even number.

[0016] On the other hand, the utility model also proposes an end cover assembly, including a plain aluminum sheet, a pole body, an upper plastic, a sealing ring, and the lower plastic structure described in the above embodiment;

[0017] The light aluminum sheet is installed on the upper surface of the lower plastic structure;

[0018] The pole body is sequentially penetrated by the pole through hole and the bare aluminum sheet, and is relatively fixed to the bare aluminum sheet and the lower plastic structure through the upper plastic, and an annular gap is reserved between the pole through hole and the pole body;

[0019] The sealing ring is installed on the outer wall of the pole body and sandwiched between the pole body and the bare aluminum sheet;

[0020] When the pole body is firmly installed inside the pole through hole, the sealing ring is squeezed and deformed to fit tightly against one end of the protrusion.

[0021] Furthermore, when the sealing ring is in close contact with one end of the protrusion, a channel for electrolyte circulation is formed between the groove, the circulation gap and the annular gap.

[0022] Furthermore, a surrounding insulating chamber is formed between the pole body and the bare aluminum sheet.

[0023] On the other hand, the utility model also provides an energy storage device, comprising the end cover assembly described in the above embodiment;

[0024] Wherein, the energy storage device is configured as a battery.

[0025] Compared with the prior art, the utility model has at least the following beneficial effects:

[0026] By providing a plurality of protrusions, and the protrusions extend along the axial direction of the pole through hole, a flow gap is formed between two adjacent protrusions, and a groove is provided on the protrusion to connect the two adjacent flow gaps in series, and when the pole body is placed in the pole through hole in cooperation with the sealing ring, since an annular gap is formed between the pole body and the pole through hole, the electrolyte placed between the pole body and the lower plastic body can be discharged along the channel formed by the groove, the flow gap and the annular gap, that is, the electrolyte will not be accumulated between the lower plastic body and the pole body for a long time, thereby ensuring that the sealing ring will not fail due to long-term contact with the electrolyte, thereby improving the stability of the device operation. In addition, since the electrolyte can flow back along the channel to participate in the electrochemical reaction, the utilization rate of the electrolyte can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural schematic diagram of the lower plastic structure in one embodiment of the utility model;

[0028] Figure 2 This is a partial structural diagram of the lower plastic structure in one embodiment of the utility model;

[0029] Figure 3 It is a partial top view of the lower plastic structure in one embodiment of the utility model;

[0030] Figure 4 This is a structural exploded view of an end cover assembly in one embodiment of the utility model;

[0031] Figure 5 A partial cross-sectional view of an end cover assembly in one embodiment of the utility model;

[0032] Figure 6 For this utility model Figure 5 Enlarged view of point A in the middle.

[0033] Figure numbers: 1, lower plastic body; 11, pole through hole; 2, support cushion; 3, protrusion; 31, groove; 4, flow gap; 5, plain aluminum sheet; 6, pole body; 7, upper plastic; 8, sealing ring; 9, annular gap; 10, surrounding insulation chamber. DETAILED DESCRIPTION

[0034] The following will be combined with schematic diagrams to describe the lower plastic structure, end cover assembly and energy storage device of the utility model in more detail, wherein the preferred embodiment of the utility model is shown, and it should be understood that those skilled in the art can modify the utility model described herein and still achieve the beneficial effects of the utility model. Therefore, the following description should be understood as being widely known to those skilled in the art, and not as a limitation to the utility model.

[0035] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0036] Embodiment 1

[0037] like Figures 1 to 3 As shown, the embodiment of the utility model provides a lower plastic structure, including a lower plastic body 1, a supporting cushion layer 2 and a plurality of protrusions 3.

[0038] The lower plastic body 1 has a pole through hole 11 therein for installing the pole body 6 .

[0039] The support pad layer 2 surrounds the pole through hole 11 and is protruded on the upper surface of the lower plastic body 1 to serve as a positioning support portion to facilitate the subsequent installation of the bare aluminum sheet 5.

[0040] The plurality of protrusions 3 are arranged in an annular shape on the inner wall of the support cushion layer 2 and extend toward the axial direction of the pole through hole 11, so that a flow gap 4 is formed between two adjacent protrusions 3, so that the electrolyte accumulated in the interlayer between the lower plastic body 1 and the pole body 6 can be discharged from the flow gap 4, thereby avoiding the situation where the electrolyte corrodes the outer wall sealing ring 8 of the pole body 6 due to long-term accumulation, thereby reducing the failure rate of the sealing ring 8.

[0041] In addition, a groove 31 is provided on the upper surface of one end of the protrusion 3 facing the pole through hole 11 to connect two adjacent flow gaps 4. The groove 31 is mainly used to collect electrolyte overflowed due to volatilization or external shaking when the battery is used. By connecting the groove 31 with two adjacent flow gaps 4, the electrolyte placed on the groove 31 can flow out in two directions, so as to further improve the discharge rate of the electrolyte.

[0042] In this embodiment, the shape of the protrusion 3 is further defined to better form the groove 31 and the flow gap 4. Specifically, the protrusion 3 is set to a stepped structure to form the groove 31, that is, the cross-sectional area of ​​the protrusion 3 decreases along the direction close to the pole through hole 11, so that the groove 31 is formed on the upper surface of the protrusion 3 to collect the electrolyte overflowed due to volatilization or external shaking when the battery is used.

[0043] In this embodiment, the height of the protrusion 3 is further limited to better support the subsequent bare aluminum sheet 5. Specifically, the top wall of the protrusion 3 away from the pole through hole 11 is flush with the upper surface of the support pad 2.

[0044] In this embodiment, the shape and size of the flow gap 4 are also limited to further increase the discharge rate of the electrolyte.

[0045] The flow gap 4 is a trapezoid, and the corresponding central angle α is 10°-30°, at which the electrolyte can be quickly discharged from the flow gap 4. Specifically, through Laplace compressive stress analysis, when the angle is less than 10°, the electrolyte flow rate is slow, and the designed flow gap 4 cannot play a role in quickly discharging the electrolyte; when the angle of the flow gap 4 is greater than 10° and less than 30°, the flow rate of the electrolyte will gradually increase; when the angle of the flow gap 4 is greater than 30°, the flow rate of the electrolyte will further increase, but because the larger the angle, the larger the area of ​​the flow gap 4 surface that the electrolyte needs to infiltrate.

[0046] It should be particularly noted that during the discharge process, the electrolyte needs to accumulate and cover the entire area of ​​the flow gap 4 due to the molecular force of the electrolyte before it can be smoothly discharged from the flow gap 4.

[0047] Therefore, when the angle of the flow gap 4 is greater than 30°, the electrolyte will easily accumulate and corrode the sealing ring 8, causing the sealing ring 8 to fail. Therefore, in this embodiment, the central angle α of the flow gap 4 is set to 10°-30°, so that while maintaining an efficient discharge rate, it also avoids the situation where the electrolyte accumulates too much and causes the sealing ring 8 to fail.

[0048] It should be particularly noted that the protrusions 3 are all configured as a trapezoidal structure, so that a trapezoidal flow gap 4 is formed between two adjacent protrusions 3 .

[0049] For the convenience of design and processing, the number of the flow gaps 4 is set to an even number to form a symmetrical arrangement, which is convenient for the molding of the lower plastic structure.

[0050] Embodiment 2

[0051] like Figures 4 to 6 As shown, this embodiment further proposes an end cover assembly based on the first embodiment, so as to prevent the sealing ring 8 from failing and improve the utilization rate of the electrolyte.

[0052] Specifically, the end cover assembly includes a plain aluminum sheet 5, a pole body 6, an upper plastic 7, a sealing ring 8 and the lower plastic structure described in the first embodiment.

[0053] The bare aluminum sheet 5 is installed on the upper surface of the lower plastic structure, that is, the support cushion layer 2 is used as a positioning support part to complete the positioning and installation of the bare aluminum sheet 5 to prevent misalignment and the like.

[0054] The pole body 6 is penetrated by the pole through hole 11 and the bare aluminum sheet 5 in sequence, and is relatively fixed with the bare aluminum sheet 5 and the lower plastic structure through the upper plastic 7, and an annular gap 9 is reserved between the pole through hole 11. That is, through the annular gap 9 formed between the pole body 6 and the pole through hole 11, the electrolyte can pass through the annular gap 9 after being discharged from the flow gap 4 to participate in the electrochemical reaction, thereby achieving the purpose of improving the utilization rate of the electrolyte, and correspondingly, the purpose of improving the battery performance can also be achieved.

[0055] In addition, the sealing ring 8 is installed on the outer wall of the pole body 6 and is sandwiched between the pole body 6 and the bare aluminum sheet 5 .

[0056] When the pole body 6 is firmly installed inside the pole through hole 11 , the sealing ring 8 is squeezed and deformed to be in close contact with one end of the protrusion 3 .

[0057] Accordingly, when the sealing ring 8 is in close contact with one end of the protrusion 3, a channel for electrolyte circulation is formed between the groove 31, the flow gap 4 and the annular gap 9, that is, the accumulated electrolyte is discharged along the groove 31, the flow gap 4 and the annular gap 9 in sequence (such as Figure 6 direction indicated by the arrow).

[0058] In addition, a surrounding insulating chamber 10 is formed between the pole body 6 and the bare aluminum sheet 5 to prevent the pole body 6 from contacting the bare aluminum sheet 5 and causing a short circuit.

[0059] The device is provided with a plurality of protrusions 3, and the protrusions 3 extend along the axial direction of the pole through hole 11, so that a flow gap 4 is formed between two adjacent protrusions 3, and a groove 31 is provided on the protrusion 3 to connect the two adjacent flow gaps 4 in series, and when the pole body 6 is placed inside the pole through hole 11 with the sealing ring 8, since an annular gap 9 is formed between the pole body 6 and the pole through hole 11, the electrolyte placed between the pole body 6 and the lower plastic body 1 can be discharged along the channel formed by the groove 31, the flow gap 4 and the annular gap 9, that is, the electrolyte will not be accumulated between the lower plastic body 1 and the pole body 6 for a long time, thereby ensuring that the sealing ring 8 will not fail due to long-term contact with the electrolyte, thereby improving the stability of the device operation. In addition, since the electrolyte can flow back along the channel to participate in the electrochemical reaction, the utilization rate of the electrolyte can also be improved.

[0060] Embodiment 3

[0061] This embodiment proposes an energy storage device on the basis of the second embodiment, and the energy storage device includes the end cover assembly described in the second embodiment.

[0062] Wherein, the energy storage device is configured as a battery, so as to improve the utilization rate of the electrolyte, thereby achieving the purpose of improving the battery performance.

[0063] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A lower plastic structure, characterized in that: It includes a lower plastic body, a supporting cushion layer and a plurality of protrusions; The lower plastic body is provided with a pole through hole; The support pad surrounds the pole through hole and is convexly disposed on the upper surface of the lower plastic body; The plurality of protrusions are arranged in an annular shape on the inner wall of the support pad layer and extend toward the axial direction of the pole through hole; A flow gap is formed between two adjacent protrusions; A groove is arranged on the upper surface of one end of the protrusion facing the pole through hole to connect two adjacent flow gaps.

2. The lower plastic structure according to claim 1, characterized in that: The protrusion is arranged in a stepped structure to form the groove.

3. The lower plastic structure according to claim 1, characterized in that: The top wall of the protrusion on one side away from the pole through hole is flush with the upper surface of the supporting pad layer.

4. The lower plastic structure according to claim 1, characterized in that: The flow gap is trapezoidal, and the corresponding central angle α is 10°-30°.

5. The lower plastic structure according to claim 4, characterized in that: The protrusions are all arranged in a trapezoidal structure, so that a trapezoidal flow gap is formed between two adjacent protrusions.

6. The lower plastic structure according to claim 1, characterized in that: The number of the flow gaps is an even number.

7. An end cap assembly, characterized in that: It comprises a bare aluminum sheet, a pole body, an upper plastic, a sealing ring and a lower plastic structure as described in any one of claims 1 to 6; The light aluminum sheet is installed on the upper surface of the lower plastic structure; The pole body is sequentially penetrated by the pole through hole and the bare aluminum sheet, and is relatively fixed to the bare aluminum sheet and the lower plastic structure through the upper plastic, and an annular gap is reserved between the pole through hole and the pole body; The sealing ring is installed on the outer wall of the pole body and sandwiched between the pole body and the bare aluminum sheet; When the pole body is firmly installed inside the pole through hole, the sealing ring is squeezed and deformed to fit tightly against one end of the protrusion.

8. The end cap assembly according to claim 7, wherein: When the sealing ring is in close contact with one end of the protrusion, a channel for electrolyte circulation is formed between the groove, the circulation gap and the annular gap.

9. The end cap assembly according to claim 7, wherein: A surrounding insulating chamber is formed between the pole body and the bare aluminum sheet.

10. An energy storage device, characterized in that: comprising an end cap assembly as claimed in any one of claims 7 to 9; Wherein, the energy storage device is configured as a battery.

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