Shell assembly for power battery and power battery

Abstract

The utility model discloses a shell assembly for a power battery and the power battery. The shell assembly comprises a shell, a rotatable sealing nail, a sealing piece and a fixing ring, a liquid supplementing groove is formed in the upper surface of the shell, a first liquid supplementing through hole is eccentrically formed in the bottom wall of the liquid supplementing groove, the sealing nail is rotatably arranged in the liquid supplementing groove, and a second liquid supplementing through hole penetrating up and down is eccentrically formed in the sealing nail; a sealing piece staggered with the second liquid supplementing through hole is fixedly arranged on the bottom wall of the sealing nail, the sealing piece is used for being connected to the bottom wall of the liquid supplementing groove in a pressed mode to seal the first liquid supplementing through hole, and the outer side of the fixing ring is fixedly connected to the side wall of the liquid supplementing groove. The inner side of the fixing ring is used for limiting the sealing nail in the vertical direction and the radial direction and allowing the sealing nail to rotate along the fixing ring, and the sealing nail rotates so that the sealing piece can move till sealing of the first liquid supplementing through hole is relieved and return to the position till sealing of the first liquid supplementing through hole is recovered. According to the embodiment of the utility model, repeated liquid supplementing of the power battery can be realized.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a housing assembly for a power battery and a power battery. Background Technology

[0002] Currently, lithium-ion / sodium-ion power batteries are gradually becoming mainstream products in the new energy industry due to their advantages such as high energy density, good capacity consistency, and ability to support high-rate charge and discharge. Conventional power battery structures generally only have one injection port, which presents the following technical problems:

[0003] Because the power battery only has one injection hole, it is permanently sealed with aluminum nails or other methods after the injection process is completed, making it impossible to perform a second injection operation.

[0004] High-rate charging and discharging of power batteries are accompanied by greater electrolyte loss. Stable cycle life of power batteries in the middle and later stages requires sufficient electrolyte inside. Therefore, secondary electrolyte replenishment of power batteries is a new requirement.

[0005] With the improvement of power battery manufacturing process and the optimization of battery material system, the cycle life of power batteries is gradually being extended. This also puts forward the need for power batteries to be replenished with electrolyte multiple times to extend the cycle life. Utility Model Content

[0006] The purpose of this invention is to provide a casing and a power battery for power batteries, which enables repeated electrolyte replenishment of the power battery.

[0007] To achieve the above objectives, this utility model provides a housing assembly for a power battery, including a housing, a rotatable sealing pin, a sealing element, and a fixing ring. The upper surface of the housing has a fluid replenishment groove, and the bottom wall of the fluid replenishment groove has an eccentrically arranged first fluid replenishment through-hole. The sealing pin is rotatably disposed in the fluid replenishment groove, and the sealing pin has an eccentrically arranged second fluid replenishment through-hole extending vertically. The sealing element, offset from the second fluid replenishment through-hole, is fixedly disposed on the bottom wall of the sealing pin. The sealing element is used to press against the bottom wall of the fluid replenishment groove to seal the first fluid replenishment through-hole. The outer side of the fixing ring is fixedly connected to the side wall of the fluid replenishment groove, and the inner side of the fixing ring is used to limit the sealing pin vertically and radially and allow the sealing pin to rotate along it. The rotation of the sealing pin allows the sealing element to shift to release the seal on the first fluid replenishment through-hole and return to its original position to restore the seal on the first fluid replenishment through-hole.

[0008] Optionally, the rotation of the sealing pin can cause the second liquid replenishment hole to rotate so that it is vertically opposite to the first liquid replenishment hole.

[0009] Optionally, the bottom outer periphery of the sealing nail is provided with a circular sliding protrusion, the bottom of which is in smooth contact with the bottom wall of the fluid replenishment groove.

[0010] Optionally, the sliding protrusion contacts the bottom wall line of the fluid replenishment groove.

[0011] Optionally, the sealing element is a sealing ring; the bottom wall of the sealing pin is provided with a sealing ring groove, and the upper part of the sealing ring is fixed in the sealing ring groove.

[0012] Optionally, the upper surface of the sealing pin is provided with a pointer mark, and the upper surface of the housing is provided with a first state mark and a second state mark near the liquid replenishment groove. The first state mark and the second state mark are located at different positions in the rotation direction of the sealing pin. When the sealing pin is rotated to the point where the pointer mark is aligned with the first state mark, the first liquid replenishment through hole is in the open state. When the sealing pin is rotated to the point where the pointer mark is aligned with the second state mark, the first liquid replenishment through hole is in the closed state.

[0013] Optionally, the sidewall of the sealing pin forms a first inverted conical surface, and the inner sidewall of the fixing ring forms a second inverted conical surface that is adapted to the first inverted conical surface. When the fixing ring is assembled in the fluid filling groove, the second inverted conical surface presses against the first inverted conical surface, the compression ratio of the seal is locked, and the sealing pin can rotate along the second inverted conical surface.

[0014] Optionally, a raised boss is provided on the outer edge of the bottom wall of the fluid replenishment groove, and the lower surface of the fixing ring is attached to the raised boss.

[0015] Optionally, the sidewall of the fluid replenishment groove and the outer sidewall of the fixing ring are matching conical surfaces.

[0016] To achieve the above objectives, the present invention also provides a power battery, including the housing assembly for the power battery as described above.

[0017] In this embodiment of the present invention, a fluid replenishment groove is provided on the upper surface of the shell, and a first fluid replenishment through hole is provided eccentrically on the bottom wall of the fluid replenishment groove. The sealing pin is rotatably disposed in the fluid replenishment groove, and a second fluid replenishment through hole is provided eccentrically on the sealing pin. A sealing member offset from the second fluid replenishment through hole is fixed on the bottom wall of the sealing pin. The sealing member is used to press against the bottom wall of the fluid replenishment groove to seal the first fluid replenishment through hole. The outer side of the fixing ring is fixedly connected to the side wall of the fluid replenishment groove, and the inner side of the fixing ring is used to limit the sealing pin in the vertical and radial directions and allow the sealing pin to rotate along it. The rotation of the sealing pin can cause the sealing member to move to release the seal on the first fluid replenishment through hole and return to its original position to restore the seal on the first fluid replenishment through hole. When the housing assembly of this utility model is used in a power battery, after long-term cycling and when the internal electrolyte is depleted and needs to be replenished, rotating the sealing pin moves the sealing element to release the seal on the first replenishment orifice, thus opening / exposing the first replenishment orifice. Replenishment can then be performed through the second and first replenishment orifices. After replenishment, rotating the sealing pin returns the sealing element to its original position, restoring the seal on the first replenishment orifice, effectively closing it again. This utility model enables repeated electrolyte replenishment of the power battery, improving its high-rate charge / discharge performance in the later stages and extending its cycle life. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the power battery according to an embodiment of the present invention.

[0019] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0020] Figure 3 This is a cross-sectional schematic diagram of a partial structure of the power battery according to an embodiment of this utility model.

[0021] Figure 4 This is a cross-sectional structural schematic diagram of the power battery from another perspective of an embodiment of this utility model.

[0022] Figure 5 yes Figure 4 Enlarged view of section B in the middle.

[0023] Figure 6 This is a partial structural schematic diagram of the shell of an embodiment of the present utility model.

[0024] Figure 7 This is a cross-sectional schematic diagram of a partial structure of the shell in an embodiment of this utility model.

[0025] Figure 8This is a three-dimensional structural diagram of the sealing nail according to an embodiment of the present invention.

[0026] Figure 9 This is a three-dimensional structural schematic diagram of the sealing nail from another perspective of an embodiment of this utility model.

[0027] Figure 10 This is a three-dimensional structural diagram of the sealing nail and sealing ring according to an embodiment of the present invention.

[0028] Figure 11 This is a three-dimensional structural diagram of the fixing ring according to an embodiment of the present invention.

[0029] Figure 12 This is a cross-sectional structural diagram of the fixing ring according to an embodiment of the present invention. Detailed Implementation

[0030] To explain in detail the technical content, structural features, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0031] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0032] Please see Figures 1 to 12 This utility model discloses a housing assembly for a power battery. The housing assembly includes a housing 10, a rotatable sealing pin 20, a sealing element 30, and a fixing ring 40. A liquid filling groove 11 is formed on the upper surface of the housing 10. A first liquid filling through hole 12 is eccentrically provided on the bottom wall of the liquid filling groove 11. The sealing pin 20 is rotatably disposed in the liquid filling groove 11. A second liquid filling through hole 21 is eccentrically provided on the sealing pin 20, penetrating vertically. A sealing element 30, offset from the second liquid filling through hole 21, is fixed on the bottom wall of the sealing pin 20. (The second liquid replenishment hole 21 is not within the range of the sealing member 30). The sealing member 30 is used to press against the bottom wall of the liquid replenishment groove 11 to seal the first liquid replenishment hole 12. The outer side of the fixing ring 40 is fixedly connected to the side wall of the liquid replenishment groove 11. The inner side of the fixing ring 40 is used to limit the sealing pin 20 in the vertical and radial directions and allow the sealing pin 20 to rotate along it. The rotation of the sealing pin 20 can cause the sealing member 30 to move to release the seal on the first liquid replenishment hole 12 and return to the original position to restore the seal on the first liquid replenishment hole 12.

[0033] When the housing 10 assembly of this utility model is used in a power battery, after long-term cycling, when the internal electrolyte is depleted and needs to be replenished, rotating the sealing pin 20 can move the sealing member 30 to release the seal on the first replenishment hole 12, thus opening / exposing the first replenishment hole 12. Replenishment can then be performed through the second replenishment hole 21 and the first replenishment hole 12. After replenishment, rotating the sealing pin 20 returns the sealing member 30 to its original position, restoring the seal on the first replenishment hole 12, thus closing the first replenishment hole 12 again. This utility model embodiment enables repeated electrolyte replenishment of the power battery, improves the high-rate charge / discharge performance in the later stages of power battery life, and extends the cycle life of the power battery.

[0034] In some embodiments, rotation of the sealing pin 20 can rotate the second replenishment through-hole 21 to be vertically aligned with the first replenishment through-hole 12. Since rotation of the sealing pin 20 can rotate the second replenishment through-hole 21 to be vertically aligned with the first replenishment through-hole 12, when replenishment is required, the sealing pin 20 can be rotated to make the second replenishment through-hole 21 and the first replenishment through-hole 12 vertically aligned, facilitating the replenishment operation.

[0035] In some embodiments, the bottom outer periphery of the sealing pin 20 is provided with a downwardly protruding annular sliding protrusion 22, and the bottom of the sliding protrusion 22 is in smooth contact with the bottom wall of the fluid replenishment groove 11. Since the bottom of the sealing pin 20 has an annular sliding protrusion 22 and the sliding protrusion 22 is in smooth contact with the bottom wall of the fluid replenishment groove 11, the sealing pin 20 can be slidably and rotatably disposed on the bottom wall of the fluid replenishment groove 11 via the sliding protrusion 22, which is beneficial to the reliable assembly of the sealing pin 20 and can also reduce the difficulty of rotating the sealing pin 20.

[0036] Specifically, the sliding protrusion 22 contacts the bottom wall of the liquid replenishment groove 11, which facilitates the rotation of the sealing pin 20 on the bottom wall of the liquid replenishment groove 11.

[0037] In a specific example, the surface of the sliding convex 22 has a radial cross-section that is arc-shaped.

[0038] In some embodiments, the sealing element 30 is a sealing ring 30; a sealing ring groove 23 is provided on the bottom wall of the sealing pin 20, the upper part of the sealing ring 30 is fixed in the sealing ring groove 23, and the lower part is pressed against the bottom wall of the fluid replenishment groove 11 to form a sealing space inside. When the sealing ring 30 surrounds the first fluid replenishment through hole 12, the first fluid replenishment through hole 12 corresponds to the sealing space, so that the first fluid replenishment through hole 12 is in a closed / sealed state. When the sealing ring 30 moves to be offset from the first fluid replenishment through hole 12, the first fluid replenishment through hole 12 is in an open state. Of course, the sealing element 30 is not limited to a sealing ring 30, as long as it can achieve the sealing of the first fluid replenishment through hole 12. When the sealing element 30 is a sealing ring 30, providing a sealing ring groove 23 on the bottom wall of the sealing pin 20 is beneficial to the stable assembly of the sealing ring 30, but it is not limited to this.

[0039] In some embodiments, the upper surface of the sealing pin 20 is provided with a pointer mark 24, and the upper surface of the housing 10 is provided with a first state mark 13 and a second state mark 14 near the liquid replenishment groove 11. The first state mark 13 and the second state mark 14 are located at different positions in the rotation direction of the sealing pin 20. When the sealing pin 20 rotates to the point where the pointer mark 24 is aligned with the first state mark 13, the first liquid replenishment through hole 12 is in the open state. When the sealing pin 20 rotates to the point where the pointer mark 24 is aligned with the second state mark 14, the first liquid replenishment through hole 12 is in the closed state. By setting the pointer mark 24 and the first state mark 13 and the second state mark 14, when the sealing pin 20 rotates to the point where the pointer mark 24 is aligned with the first state mark 13, it can be determined that the first liquid replenishment through hole 12 is in the open state. At this time, liquid replenishment can be performed through the second liquid replenishment through hole 21 and the first liquid replenishment through hole 12. After liquid replenishment is completed, when the sealing pin 20 rotates to the point where the pointer mark 24 is aligned with the second state mark 14, it can be determined that the first liquid replenishment through hole 12 returns to the closed state.

[0040] Specifically, the pointer mark 24 may take the form of a grooved indentation, but is not limited to this. For ease of identification, the pointer mark 24 may be colored, etc.

[0041] Specifically, the first state identifier 13 and the second state identifier 14 can be set to a concave dot form, but are not limited to this. For ease of identification, the first state identifier 13 and the second state identifier 14 can be colored, for example, the first state identifier 13 can be set to red and the second state identifier 14 can be set to blue.

[0042] In some embodiments, the sidewall of the sealing pin 20 forms a first inverted conical surface 25, and the inner sidewall of the retaining ring 40 forms a second inverted conical surface 41 adapted to the first inverted conical surface 25. When the retaining ring 40 is assembled in the fluid replenishment groove 11, the second inverted conical surface 41 presses against the first inverted conical surface 25, and the compression ratio of the seal 30 is locked (that is, the contact force with the bottom wall of the fluid replenishment groove 11 is locked), allowing the sealing pin 20 to rotate along the second inverted conical surface 41. By means of the cooperation between the second inverted conical surface 41 of the retaining ring 40 and the first inverted conical surface 25 of the sealing pin 20, the sealing pin 20 can be limited in the vertical and radial directions (i.e., it cannot move vertically and radially), while also allowing the sealing pin 20 to rotate along the second inverted conical surface 41, and locking the compression ratio of the seal 30.

[0043] Specifically, a boss 111 is provided on the outer edge of the bottom wall of the fluid replenishment groove 11. The lower surface of the fixing ring 40 is attached to the boss 111. That is, after the fixing ring 40 is assembled, the fixing ring 40 is supported on the boss 111.

[0044] Specifically, the upper surface of the retaining ring 40 is a horizontal plane that is flush with or slightly lower than the upper surface of the housing 10. That is, after the retaining ring 40 is assembled, the upper surface of the retaining ring 40 is flush with or slightly lower than the upper surface of the housing 10, but it is not limited to this.

[0045] Specifically, the sidewall of the fluid replenishment groove 11 and the outer sidewall of the fixing ring 40 are matching conical surfaces, but this is not a limitation.

[0046] Specifically, the outer wall of the fixing ring 40 and the outer wall of the fluid replenishment groove 11 are fixed together by laser welding.

[0047] In some embodiments, the sealing nail 20 may be made of aluminum or steel, but is not limited to these materials.

[0048] In some embodiments, the sealing pin 20 may be integrally stamped / stretched, but is not limited to this.

[0049] In some embodiments, the retaining ring 40 may be made of aluminum or steel, but is not limited to these materials.

[0050] In some embodiments, the retaining ring 40 may be integrally stamped / stretched, but is not limited to this.

[0051] In the example shown in the attached figure, the housing 10 is the outer casing of the power battery, which is used to fit over the outside of the winding core. It includes the housing sidewall 101 and the housing bottom 102, wherein the upper surface of the housing 10 refers to the upper surface (outer surface) of the housing bottom 102. Of course, the housing 10 is not limited to an outer casing; it can also be a cover for the power battery, in which case the upper surface of the housing 10 is the upper surface (outer surface) of the cover.

[0052] To facilitate understanding of this invention, the assembly process of the housing assembly is described below with reference to the examples shown in the accompanying drawings. This should not be construed as a limitation of the invention.

[0053] First, install and fix the sealing ring 30 in the sealing ring groove 23 at the bottom of the sealing nail 20.

[0054] Next, the sealing nail 20 is placed into the liquid replenishment groove 11, and the sealing ring 30 is pressed against the bottom wall of the liquid replenishment groove 11.

[0055] Next, the fixing ring 40 is assembled. The second inverted conical surface 41 of the fixing ring 40 presses down on the sealing nail 20 through the first inverted conical surface 25 and adjusts the sealing nail 20 in an adaptive position. When the lower surface of the fixing ring 40 is attached to the boss 111, the sealing nail 20 is limited in the vertical and radial directions, so that the sealing ring 30 is compressed downward into place. The sliding protrusion 22 forms line contact with the bottom wall of the liquid replenishment groove 11, and the first inverted conical surface 25 and the second inverted conical surface 41 fit together.

[0056] Next, the outer wall of the fixing ring 40 and the side wall of the liquid filling groove 11 are welded and fixed by laser welding.

[0057] Please combine Figures 1 to 12 This utility model embodiment also discloses a power battery, including the housing assembly for the power battery as described above.

[0058] When the electrolyte in the power battery of this embodiment is depleted after long-term cycling and needs to be replenished, rotating the sealing pin 20 can move the sealing member 30 to release the seal on the first replenishment hole 12, thus opening / exposing the first replenishment hole 12. Replenishment can then be performed through the second replenishment hole 21 and the first replenishment hole 12. After replenishment, rotating the sealing pin 20 returns the sealing member 30 to its original position, restoring the seal on the first replenishment hole 12, effectively closing it again. This embodiment enables repeated electrolyte replenishment of the power battery, improving the high-rate charge / discharge performance in the later stages of power battery life and extending its cycle life.

[0059] The above-disclosed examples are merely preferred embodiments of the present utility model, intended to facilitate understanding and implementation by those skilled in the art. They should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model are still within the scope of the present utility model.

Claims

1. A housing assembly for a power battery, characterized in that, The housing assembly includes a housing, a rotatable sealing pin, a sealing element, and a retaining ring. A fluid replenishment groove is formed on the upper surface of the housing. A first fluid replenishment through-hole is eccentrically provided on the bottom wall of the fluid replenishment groove. The sealing pin is rotatably disposed in the fluid replenishment groove. A second fluid replenishment through-hole is eccentrically provided on the sealing pin. The sealing element, offset from the second fluid replenishment through-hole, is fixedly provided on the bottom wall of the sealing pin. The sealing element is used to press against the bottom wall of the fluid replenishment groove to seal the first fluid replenishment through-hole. The outer side of the retaining ring is fixedly connected to the side wall of the fluid replenishment groove. The inner side of the retaining ring is used to limit the sealing pin in the vertical and radial directions and allow the sealing pin to rotate along it. The rotation of the sealing pin allows the sealing element to shift to release the seal on the first fluid replenishment through-hole and return to its original position to restore the seal on the first fluid replenishment through-hole.

2. The housing assembly for a power battery according to claim 1, characterized in that, The rotation of the sealing pin enables the second fluid replenishment hole to rotate so that it is vertically aligned with the first fluid replenishment hole.

3. The housing assembly for a power battery according to claim 1, characterized in that, The bottom outer periphery of the sealing nail has a downward-protruding annular sliding protrusion, and the bottom of the sliding protrusion is in smooth contact with the bottom wall of the liquid replenishment groove.

4. The housing assembly for a power battery according to claim 3, characterized in that, The sliding protrusion contacts the bottom wall line of the fluid replenishment groove.

5. The housing assembly for a power battery according to claim 1, characterized in that, The sealing element is a sealing ring; the bottom wall of the sealing nail has a sealing ring groove, and the upper part of the sealing ring is fixed in the sealing ring groove.

6. The housing assembly for a power battery according to claim 1, characterized in that, The upper surface of the sealing pin is provided with a pointer mark, and the upper surface of the housing is provided with a first state mark and a second state mark near the liquid replenishment groove. The first state mark and the second state mark are located at different positions in the rotation direction of the sealing pin. When the sealing pin is rotated to the point where the pointer mark is aligned with the first state mark, the first liquid replenishment through hole is in the open state. When the sealing pin is rotated to the point where the pointer mark is aligned with the second state mark, the first liquid replenishment through hole is in the closed state.

7. The housing assembly for a power battery according to claim 1, characterized in that, The sidewall of the sealing pin forms a first inverted conical surface, and the inner sidewall of the fixing ring forms a second inverted conical surface that is adapted to the first inverted conical surface. When the fixing ring is assembled in the fluid filling groove, the second inverted conical surface is pressed against the first inverted conical surface, the compression ratio of the seal is locked, and the sealing pin can rotate along the second inverted conical surface.

8. The housing assembly for a power battery according to claim 7, characterized in that, The bottom wall of the fluid replenishment groove has an upward protrusion of a boss, and the lower surface of the fixing ring is attached to the boss.

9. The housing assembly for a power battery according to claim 7 or 8, characterized in that, The sidewalls of the fluid replenishment groove and the outer sidewalls of the fixing ring are matching conical surfaces.

10. A power battery, characterized in that, Includes the housing assembly for a power battery as described in any one of claims 1 to 9.

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