Cover body assembly of power battery and power battery

Abstract

The utility model discloses a cover body assembly of a power battery and the power battery, the cover body assembly comprises a cover body, a lower insulating part, an upper insulating part, a pole and a riveting block, the cover body is provided with an anti-rotation upper recess and an anti-rotation lower recess; the lower insulating part comprises a first substrate part, the first substrate part is upwards convexly provided with an anti-rotation upper bulge, the anti-rotation upper bulge is adaptively positioned on the anti-rotation upper concave part, the first substrate part is downwards convexly provided with a first bulge loop part, and the first bulge loop part is inwards convexly provided with a first anti-rotation side bulge; the upper insulating part comprises a second substrate part, the second substrate part is downwards convexly provided with an anti-rotation lower bulge, the anti-rotation lower bulge is adaptively positioned on the anti-rotation lower recess, the outer periphery of the second substrate part is upwards convexly provided with a second bulge loop part, and the second bulge loop part is inwards convexly provided with a second anti-rotation side bulge; a first anti-rotation side concave part is formed in the side wall of the base of the pole; the first anti-rotation side convex part is adaptively positioned in the first anti-rotation side concave part; and the riveting block is annularly arranged at the upper end of the column body part and arranged on the second base plate part, a second anti-rotation side concave part is formed in the outer periphery of the riveting block, and the second anti-rotation side convex part is located in the second anti-rotation side concave part in a matched mode.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cover assembly of a power battery and the power battery. Background Art

[0002] At present, lithium-ion / sodium-ion and other power batteries have gradually become mainstream products in the new energy industry due to their high energy density, good capacity consistency, and support for high-rate charging and discharging.

[0003] To reduce costs and increase production capacity, many manufacturers choose a riveted top cover structure for power batteries, where the poles are fixed to the top cover by riveting with rivet blocks. However, this method has the following common problems:

[0004] Existing power battery top cover structures have a riveted top cover structure, where the poles are typically round and fixed to the top cover by riveting. If the anti-rotation limit is insufficient, the busbar can easily cause the poles / connecting plates to rotate during long-term vibration / torsion during installation or roller testing. This can directly impact the stability of the battery structure and cause the riveted top cover to become damaged (e.g., the riveting becomes unstable, the sealing ring wears, etc.), leading to problems such as top cover leakage, abnormal charging and discharging, and overcurrent, shortening the battery life. Utility Model Content

[0005] The purpose of the present invention is to provide a cover assembly of a power battery and a power battery, which can solve at least one technical problem in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention provides a cover assembly for a power battery, comprising:

[0007] A cover body, wherein a first through hole is formed on the cover body, and at least two anti-rotation recesses are formed upward on the lower side of the cover body, and at least two anti-rotation recesses are formed downward on the upper side of the cover body;

[0008] a lower insulating member, wherein the lower insulating member includes a first base plate portion, the first base plate portion is fixed to the lower side of the cover body, the first base plate portion is upwardly provided with at least two anti-rotation upper protrusions, the anti-rotation upper protrusions are adapted to be positioned in the corresponding anti-rotation upper recesses, the first base plate portion is formed with a second through hole, the diameter of the second through hole is larger than the diameter of the first through hole, and the second through hole and the first through hole are arranged concentrically, the first base plate portion is downwardly provided with a first convex ring portion surrounding the second through hole at a position close to the second through hole, and the inner side of the first convex ring portion is inwardly provided with at least two first anti-rotation side protrusions;

[0009] an upper insulating member, the upper insulating member including a second base plate portion, the second base plate portion being fixed to the upper side of the cover body, the second base plate portion being provided with at least two anti-rotation protrusions protruding downward, the anti-rotation protrusions being adapted to be positioned in the corresponding anti-rotation recesses, a second convex ring portion being provided protruding upward on the outer periphery of the second base plate portion, at least two second anti-rotation side protrusions being provided protruding inwardly on the inner side of the second convex ring portion, a third through hole being formed in the second base plate portion, the third through hole being concentrically arranged with the first through hole;

[0010] A pole, comprising a base and a column portion extending upward from a middle portion of the base, wherein a side wall of the base is provided with at least two first anti-rotation recesses, the base being upwardly fitted onto the second base plate portion and radially limited by the second convex ring portion, the first anti-rotation projections being adapted to be positioned in the corresponding first anti-rotation recesses, and the column portion extending upwardly through the second through hole, the first through hole, and the third through hole;

[0011] A rivet block is arranged around the upper end of the column portion and on the second base plate portion. The outer periphery of the rivet block is provided with at least two second anti-rotation side recesses, and the second anti-rotation side protrusions are adapted to be positioned in the second anti-rotation side recesses.

[0012] Optionally, the number of the anti-rotation concave portions is two, located on two opposite sides of the first through hole; the number of the anti-rotation convex portions is two, located on two opposite sides of the second through hole.

[0013] Optionally, the number of the anti-rotation concave portions is two, which are located on two opposite sides of the first through hole; the number of the anti-rotation convex portions is two, which are located on two opposite sides of the third through hole.

[0014] Optionally, the two anti-rotation upper recesses and the two anti-rotation lower recesses are distributed at equal angles in the circumferential direction.

[0015] Optionally, a mounting groove is formed on the upper surface of the cover body, the second substrate portion is arranged in the mounting groove, and the bottom wall of the mounting groove is recessed downward to form the anti-rotation recess.

[0016] Optionally, the number of the first anti-rotation side protrusions is two, which are located on two opposite sides of the second through hole; the number of the first anti-rotation side concave is two, which are located on two opposite sides of the base.

[0017] Optionally, the number of the second anti-rotation side protrusions is two, which are located on two opposite sides of the third through hole; the number of the second anti-rotation side concave is two, which are located on two opposite sides of the rivet block.

[0018] Optionally, an upper surface of the second anti-rotation side protrusion is lower than an upper surface of the second convex ring portion, and a stop wall is formed on an upper side of the second anti-rotation side concave.

[0019] Optionally, the cover assembly further includes a sealing ring, which is sleeved on the column portion and clamped between the cover and the base, and the sealing ring portion extends upward into the first through hole; the outer periphery of the third through hole of the upper insulating member protrudes downwardly into an annular protrusion, and the annular protrusion extends downward into the first through hole, and when the sealing ring is compressed downward, it fills the space between the annular protrusion and the sealing ring.

[0020] To achieve the above-mentioned objectives, the present invention further provides a power battery, comprising the cover assembly as described above.

[0021] In the embodiment of the present invention, when the lower insulating part is assembled to the cover body, the anti-rotation upper convex is adapted and positioned in the corresponding anti-rotation upper concave to achieve bite-proof anti-rotation; when the upper insulating part is assembled to the cover body, the anti-rotation lower convex is adapted and positioned in the corresponding anti-rotation lower concave to achieve bite-proof anti-rotation; when the base of the pole is assembled to the lower insulating part, the first anti-rotation side convex is adapted and positioned in the corresponding first anti-rotation side concave to achieve bite-proof anti-rotation; when the rivet block is assembled to the upper insulating part, the second anti-rotation side convex is adapted and positioned in the second anti-rotation side concave to achieve bite-proof anti-rotation, that is, when the various structural parts are assembled, they can bite each other to prevent rotation, and then when the bar brings rotational impact to the pole during vehicle loading vibration or roller testing, the cover assembly can offset / limit stress with the assistance of the bite of each group of concave and convex structures, which is beneficial to avoid damage to the structure of the cover assembly, avoid external forces such as vibration / torsion that impact the stability of the battery structure, and thus help avoid leakage of the power battery and ensure normal charging and discharging overcurrent, thereby improving the battery service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic cross-sectional structure diagram of the cover assembly of the power battery according to an embodiment of the present utility model.

[0023] Figure 2 This is another cross-sectional structural diagram of the cover assembly of the power battery according to an embodiment of the present utility model.

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the cover body of an embodiment of the present utility model.

[0025] Figure 4 This is another three-dimensional structural diagram of the cover body of an embodiment of the present invention.

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the lower insulating member in an embodiment of the present utility model.

[0027] Figure 6 This is another three-dimensional structural diagram of the lower insulating member according to an embodiment of the present utility model.

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the insulating member in the embodiment of the present utility model.

[0029] Figure 8 This is another three-dimensional structural diagram of the insulating member in an embodiment of the present utility model.

[0030] Figure 9 It is a schematic diagram of the three-dimensional structure of the pole in the embodiment of the utility model.

[0031] Figure 10 It is a schematic diagram of the three-dimensional structure of the riveting block according to the embodiment of the utility model. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] It should be noted that, in the present invention, "inside" and "outside" can be defined based on the center of the pole mounting hole, and a position closer to the pole mounting hole can be referred to as inside relative to a position farther away from the pole mounting hole.

[0034] See also Figures 1 to 10The present invention discloses a cover assembly for a power battery, including a cover 10, a lower insulator 20, an upper insulator 30, a terminal 40, and a rivet block 50. The cover 10 is formed with a first through hole 11. The lower side of the cover 10 is recessed upward with at least two anti-rotation recesses 12, and the upper side of the cover 10 is recessed downward with at least two anti-rotation recesses 13. The lower insulating member 20 includes a first substrate portion 21, which is fixed to the lower side of the cover body 10. The first substrate portion 21 is provided with at least two anti-rotation upper protrusions 22 protruding upward, and the anti-rotation upper protrusions 22 are adapted to be positioned in the corresponding anti-rotation upper recesses 12. The first substrate portion 21 is formed with a second through hole 23. The diameter of the second through hole 23 is larger than the diameter of the first through hole 11, and the second through hole 23 and the first through hole 11 are arranged concentrically. The first substrate portion 21 is provided with a first convex ring portion 24 protruding downward at a position close to the second through hole 23, which surrounds the second through hole 23. The inner side of the first convex ring portion 24 is provided with at least two first anti-rotation side protrusions 25 protruding inward. The upper insulating member 30 includes a second substrate portion 31, which is fixed to the upper side of the cover body 10. The second substrate portion 31 is provided with at least two anti-rotation protrusions 32 protruding downward, and the anti-rotation protrusions 32 are adapted to be positioned in the corresponding anti-rotation recesses 13. The outer periphery of the second substrate portion 31 is provided with a second convex ring portion 33 protruding upward, and the inner side of the second convex ring portion 33 is provided with at least two second anti-rotation side protrusions 34 protruding inward. The second substrate portion 31 is formed with a third through hole 35, and the third through hole 35 is concentrically arranged with the first through hole 11. The pole 40 includes a base 41 and a cylindrical portion 42 extending upward from the middle of the base 41. The sidewall of the base 41 is provided with at least two first anti-rotation recesses 43. The base 41 is upwardly abutted against the second substrate portion 31 and radially limited by the second convex ring portion 33. The first anti-rotation protrusions 25 are adapted to be positioned in the corresponding first anti-rotation recesses 43. The cylindrical portion 42 extends upward through the second through-hole 23, the first through-hole 11, and the third through-hole 35 (i.e., the upper end of the cylindrical portion 42 extends out of the third through-hole 35). A rivet block 50 is disposed around the upper end of the cylindrical portion 42 and is disposed on the second substrate portion 31. The outer periphery of the rivet block 50 is provided with at least two second anti-rotation recesses 51, and the second anti-rotation protrusions 34 are adapted to be positioned in the second anti-rotation recesses 51.

[0035] In the embodiment of the present invention, when the lower insulating member 20 is assembled to the cover body 10, the anti-rotation upper protrusion 22 is adapted and positioned in the corresponding anti-rotation upper concave 12 to achieve bite-proof rotation. When the upper insulating member 30 is assembled to the cover body 10, the anti-rotation lower protrusion 32 is adapted and positioned in the corresponding anti-rotation lower concave 13 to achieve bite-proof rotation. When the base 41 of the pole 40 is assembled to the lower insulating member 20, the first anti-rotation side protrusion 25 is adapted and positioned in the corresponding first anti-rotation side concave 43 to achieve bite-proof rotation. When the rivet block 50 is assembled to the upper insulating member 30, the second anti-rotation side protrusion 32 is adapted and positioned in the corresponding anti-rotation lower concave 13 to achieve bite-proof rotation. 4 is adapted to be positioned in the second anti-rotation side recess 51 to achieve interlocking anti-rotation, that is, when the various structural parts are assembled, they can interlock with each other to prevent rotation. Furthermore, when the tabs bring rotational impact to the pole 40 during vehicle loading vibration or roller testing, the cover assembly can offset / limit stress with the help of the interlocking of the various groups of concave and convex structures, which is beneficial to avoid damage to the structure of the cover assembly and avoid external forces such as vibration / torsion that impact the stability of the battery structure, thereby helping to avoid leakage of the power battery and ensure normal charge and discharge overcurrent, thereby improving the battery life.

[0036] In some embodiments, there are two anti-rotation recesses 12, located on opposite sides of the first through hole 11; and two anti-rotation protrusions 22, located on opposite sides of the second through hole 23. Of course, the number and arrangement of the anti-rotation recesses 12 and the anti-rotation protrusions 22 are not limited to this.

[0037] In some embodiments, there are two anti-rotation recesses 13, located on opposite sides of the first through hole 11; and two anti-rotation protrusions 32, located on opposite sides of the third through hole 35. Of course, the number and arrangement of the anti-rotation recesses 13 and the anti-rotation protrusions 32 are not limited to this.

[0038] In this specific example, the two anti-rotation upper recesses 12 and the two anti-rotation lower recesses 13 are equiangularly distributed along the circumference. That is, each anti-rotation upper recess 12 is spaced 90° from the adjacent anti-rotation lower recess 13, thereby enhancing overall anti-rotation reliability. Of course, this is not a limitation.

[0039] In some embodiments, a mounting groove 14 is formed on the upper surface of the cover 10, and the second substrate portion 31 is disposed in the mounting groove 14. The bottom wall of the mounting groove 14 is recessed downward to form an anti-rotation recess 13. The mounting groove 14 facilitates the secure assembly of the upper insulator 30 to the cover 10.

[0040] In some embodiments, there are two first anti-rotation protrusions 25 located on opposite sides of the second through hole 23; and there are two first anti-rotation recesses 43 located on opposite sides of the base 41. Of course, the number and arrangement of the first anti-rotation protrusions 25 and the first anti-rotation recesses 43 are not limited to these.

[0041] In some embodiments, there are two second anti-rotation protrusions 34 located on opposite sides of the third through hole 35; and there are two second anti-rotation recesses 51 located on opposite sides of the riveting block 50. Of course, the number and arrangement of the second anti-rotation protrusions 34 and the second anti-rotation recesses 51 are not limited to these.

[0042] In some embodiments, the upper surface of the second anti-rotation side protrusion 34 is lower than the upper surface of the second convex ring portion 33 , and a stop wall 511 is formed on the upper side of the second anti-rotation side recess 51 , that is, the second anti-rotation side recess 51 passes through the upper surface of the rivet block 50 .

[0043] In some embodiments, the cover assembly also includes a sealing ring 60, which is sleeved on the column portion 42 and clamped between the cover 10 and the base 41, and the sealing ring 60 partially extends upward into the first through hole 11; the outer periphery of the third through hole 35 of the upper insulating member 30 protrudes downwardly from the annular protrusion 36, and the annular protrusion 36 extends downward into the first through hole 11. When the sealing ring 60 is compressed downward (when the rivet block 50 is riveted), it fills the space between the annular protrusion 36 and the sealing ring 60.

[0044] In some embodiments, the cover 10 may be made of aluminum, such as Al3003; the upper insulator 30 may be made of PPS or PP; the rivet block 50 / pole 40 may be made of aluminum or copper; and the lower insulator 20 may be made of PP or PET. However, this is not limiting.

[0045] The cover assembly of the embodiment of the utility model can be assembled using the following assembly method:

[0046] First, the pole 40 is placed in a riveting die and positioned with a fixture.

[0047] Next, the lower insulating part 20 is placed in the riveting mold, the base 41 is upwardly fitted on the second substrate portion 31 and is radially limited by the second convex ring portion 33, the first anti-rotation side protrusion 25 is adapted and positioned in the corresponding first anti-rotation side recess 43, and the column portion 42 passes through the second through hole 23 upward.

[0048] Next, the cover 10 is placed into a riveting mold, and the anti-rotation protrusion 22 of the lower insulating member 20 is adapted and positioned in the corresponding anti-rotation concave 12 of the cover 10 .

[0049] Next, the upper insulating member 30 is placed into the mounting groove 14 of the cover 10 , and the anti-rotation protrusion 32 of the upper insulating member 30 is adapted and positioned in the corresponding anti-rotation concave 13 of the cover 10 .

[0050] Next, the riveting block 50 is placed into the upper insulating member 30 , and the second anti-rotation protrusion 34 of the upper insulating member 30 is adapted and positioned in the second anti-rotation concave 51 of the riveting block 50 .

[0051] Next, the riveting fixture presses down the riveting block 50 to complete the expansion riveting.

[0052] Next, the riveted portion (the upper edge of the pole 40 ) is fixed by laser welding.

[0053] See also Figures 1 to 10 The embodiment of the present utility model further discloses a power battery, comprising the cover assembly as described above.

[0054] In the embodiment of the present invention, when the lower insulating member 20 is assembled to the cover body 10, the anti-rotation upper protrusion 22 is adapted and positioned in the corresponding anti-rotation upper concave 12 to achieve bite-proof rotation. When the upper insulating member 30 is assembled to the cover body 10, the anti-rotation lower protrusion 32 is adapted and positioned in the corresponding anti-rotation lower concave 13 to achieve bite-proof rotation. When the base 41 of the pole 40 is assembled to the lower insulating member 20, the first anti-rotation side protrusion 25 is adapted and positioned in the corresponding first anti-rotation side concave 43 to achieve bite-proof rotation. When the rivet block 50 is assembled to the upper insulating member 30, the second anti-rotation side protrusion 32 is adapted and positioned in the corresponding anti-rotation lower concave 13 to achieve bite-proof rotation. 4 is adapted to be positioned in the second anti-rotation side recess 51 to achieve interlocking anti-rotation, that is, when the various structural parts are assembled, they can interlock with each other to prevent rotation. Furthermore, when the tabs bring rotational impact to the pole 40 during vehicle loading vibration or roller testing, the cover assembly can offset / limit stress with the help of the interlocking of the various groups of concave and convex structures, which is beneficial to avoid damage to the structure of the cover assembly and avoid external forces such as vibration / torsion that impact the stability of the battery structure, thereby helping to avoid leakage of the power battery and ensure normal charge and discharge overcurrent, thereby improving the battery life.

[0055] The above disclosure is only a preferred example of the present invention, and its role is to facilitate the understanding and implementation of those skilled in the art. It certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made within the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A cover assembly of a power battery, characterized in that: include: A cover body, wherein a first through hole is formed on the cover body, and at least two anti-rotation recesses are formed upward on the lower side of the cover body, and at least two anti-rotation recesses are formed downward on the upper side of the cover body; a lower insulating member, wherein the lower insulating member includes a first base plate portion, the first base plate portion is fixed to the lower side of the cover body, the first base plate portion is upwardly provided with at least two anti-rotation upper protrusions, the anti-rotation upper protrusions are adapted to be positioned in the corresponding anti-rotation upper recesses, the first base plate portion is formed with a second through hole, the diameter of the second through hole is larger than the diameter of the first through hole, and the second through hole and the first through hole are arranged concentrically, the first base plate portion is downwardly provided with a first convex ring portion surrounding the second through hole at a position close to the second through hole, and the inner side of the first convex ring portion is inwardly provided with at least two first anti-rotation side protrusions; an upper insulating member, the upper insulating member including a second base plate portion, the second base plate portion being fixed to the upper side of the cover body, the second base plate portion being provided with at least two anti-rotation protrusions protruding downward, the anti-rotation protrusions being adapted to be positioned in the corresponding anti-rotation recesses, a second convex ring portion being provided protruding upward on the outer periphery of the second base plate portion, at least two second anti-rotation side protrusions being provided protruding inwardly on the inner side of the second convex ring portion, a third through hole being formed in the second base plate portion, the third through hole being concentrically arranged with the first through hole; A pole, comprising a base and a column portion extending upward from a middle portion of the base, wherein a side wall of the base is provided with at least two first anti-rotation recesses, the base being upwardly fitted onto the second base plate portion and radially limited by the second convex ring portion, the first anti-rotation projections being adapted to be positioned in the corresponding first anti-rotation recesses, and the column portion extending upwardly through the second through hole, the first through hole, and the third through hole; A rivet block is arranged around the upper end of the column portion and on the second base plate portion. The outer periphery of the rivet block is provided with at least two second anti-rotation side recesses, and the second anti-rotation side protrusions are adapted to be positioned in the second anti-rotation side recesses.

2. The cover assembly of the power battery according to claim 1, characterized in that: The number of the anti-rotation concave portions is two, and they are located on two opposite sides of the first through hole; the number of the anti-rotation convex portions is two, and they are located on two opposite sides of the second through hole.

3. The cover assembly of the power battery according to claim 2, characterized in that: The number of the anti-rotation concave portions is two, and they are located on two opposite sides of the first through hole; the number of the anti-rotation convex portions is two, and they are located on two opposite sides of the third through hole.

4. The cover assembly of the power battery according to claim 3, characterized in that: The two anti-rotation upper recesses and the two anti-rotation lower recesses are distributed at equal angles in the circumferential direction.

5. The cover assembly of the power battery according to claim 1, characterized in that: An installation groove is formed on the upper surface of the cover body, the second substrate portion is arranged in the installation groove, and the bottom wall of the installation groove is recessed downward to form the anti-rotation recess.

6. The cover assembly of the power battery according to claim 1, characterized in that: The number of the first anti-rotation side protrusions is two, and they are located on two opposite sides of the second through hole; the number of the first anti-rotation side concave is two, and they are located on two opposite sides of the base.

7. The cover assembly of the power battery according to claim 1, characterized in that: The number of the second anti-rotation side protrusions is two, and they are located on two opposite sides of the third through hole; the number of the second anti-rotation side concave is two, and they are located on two opposite sides of the riveting block.

8. The cover assembly of the power battery according to claim 1, characterized in that: The upper surface of the second anti-rotation side protrusion is lower than the upper surface of the second convex ring portion, and a stop wall is formed on the upper side of the second anti-rotation side concave.

9. The cover assembly of the power battery according to claim 1, characterized in that: It also includes a sealing ring, which is sleeved on the column part and clamped between the cover body and the base, and the sealing ring portion extends upward into the first through hole; the outer periphery of the third through hole of the upper insulating member protrudes downwardly into an annular protrusion, and the annular protrusion extends downward into the first through hole, and when the sealing ring is compressed downward, it fills the space between the annular protrusion and the sealing ring.

10. A power battery, characterized in that: Comprising the cover assembly according to any one of claims 1 to 9.

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