Battery cover plate assembly and power device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cover plate assembly and a power device, and the battery cover plate assembly comprises a cover plate and an anti-explosion valve patch. The cover plate comprises a cover plate body, and the cover plate body is provided with a mounting hole; a first shielding part is arranged on the end surface of the mounting hole; the anti-explosion valve patch comprises a patch body and a second shielding part arranged on the edge of the patch body in a protruding mode. The explosion-proof valve patch is arranged on the mounting hole, the second shielding part is arranged outside the first shielding part, and the first shielding part and the second shielding part form a retaining wall surrounding the mounting hole by a circle; in the thickness direction of the cover plate body, at least part of the second shielding part is overlapped with the first shielding part, a ventilation channel is arranged between the first shielding part and the second shielding part, and an inner cavity of the mounting hole is communicated with the outside through the ventilation channel. The first shielding part and the second shielding part can prevent electrolyte from entering the mounting hole. Meanwhile, the ventilation channel enables the inner cavity of the mounting hole to be communicated with the outside and can be used for helium detection of the cover plate, and explosion of the anti-explosion valve is prevented from being affected.

Description

Technical Field

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

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing.

[0003] As an accessory in lithium-ion batteries, the lithium battery explosion-proof valve protection patch is used to prevent impurities such as electrolyte, dust, and metal chips from contaminating the explosion-proof valve.

[0004] The explosion-proof valve patch in the related technology is generally made of PET material, which is transparent in appearance, so that the explosion-proof valve patch can be easily observed. A notch or cut is provided at one end of the explosion-proof valve patch, which serves the following purposes: 1. The helium detection vent glue of the cover plate sticks the explosion-proof valve patch on the smooth aluminum sheet; 2. The air pressure inside the patch is kept consistent with that outside to avoid affecting the explosion of the explosion-proof valve.

[0005] At present, the explosion-proof valve patch and the top cover are directly glued together. During the battery filling process, electrolyte overflow or dripping can enter the surface of the explosion-proof valve through the opening of the explosion-proof valve patch and contaminate the explosion-proof valve. Utility Model Content

[0006] In view of this, the utility model provides a battery cover assembly and a power device to solve the problem that electrolyte easily enters the opening of the explosion-proof valve and contaminates the explosion-proof valve.

[0007] In the first aspect, the utility model provides a battery cover assembly, including a cover and an explosion-proof valve patch. The cover includes a cover body, the cover body is provided with a mounting hole for installing the explosion-proof valve; the end surface of the mounting hole is provided with a first shielding portion protruding from the cover body; the explosion-proof valve patch includes a patch body and a second shielding portion protruding from the edge of the patch body; the explosion-proof valve patch is provided on the mounting hole, the second shielding portion is provided outside the first shielding portion, and the first shielding portion and the second shielding portion form a retaining wall around the mounting hole; along the thickness direction of the cover body, the second shielding portion at least partially overlaps with the first shielding portion, and a ventilation channel is provided between the first shielding portion and the second shielding portion, and the ventilation channel connects the inner cavity of the mounting hole with the outside.

[0008] Beneficial effect: By setting a first shielding portion on the mounting hole of the cover body, the first shielding portion protrudes from the cover body, and the explosion-proof valve patch is provided with a second shielding portion protruding from the patch body, so that when the explosion-proof valve patch is covered on the mounting hole of the cover body, the second shielding portion is arranged outside the first shielding portion, and the first shielding portion and the second shielding portion form a retaining wall around the mounting hole. Since the second shielding portion and the first shielding portion at least partially overlap along the thickness direction of the cover body, a retaining wall is formed between the second shielding portion of the explosion-proof valve patch and the first shielding portion of the mounting hole, which can block the electrolyte from entering the mounting hole, prevent the electrolyte from contaminating the explosion-proof valve assembled in the mounting hole, and protect the explosion-proof valve. At the same time, since a ventilation channel is provided between the first shielding portion and the second shielding portion, the inner cavity of the mounting hole can be connected to the outside, which can be used for helium detection of the cover plate. At the same time, the air pressure inside the explosion-proof valve patch is consistent with that outside, avoiding affecting the explosion of the explosion-proof valve.

[0009] In an optional embodiment, the first shielding portion includes a closed convex edge arranged around the mounting hole, and the second shielding portion includes a closed retaining ring arranged around the patch body.

[0010] Beneficial effect: the first shielding part is provided with a closed-loop convex edge, and the second shielding part is provided with a closed-loop retaining ring. When the second shielding part and the first shielding part are provided, the first shielding part and the second shielding part overlap in the entire circumference, and the effect of shielding the electrolyte is better.

[0011] In an optional embodiment, a first notch is provided at the top of the protruding edge, a second notch is provided at the inner wall of the retaining ring corresponding to the first notch, and the first notch and the second notch are connected to form a ventilation channel.

[0012] Beneficial effect: a first notch is arranged on the convex edge, a second notch is arranged on the retaining ring, and the positions of the first notch and the second notch are arranged correspondingly, so that when the explosion-proof valve patch is assembled on the mounting hole, the first notch and the second notch are assembled correspondingly, and the two form a ventilation channel.

[0013] In an optional implementation, the height of the convex edge protruding from the cover plate body is h1; the depth of the first notch sunken into the convex edge is h2, and h2

[0014] Beneficial effect: With such arrangement, the first notch still protrudes from the cover body, and the first notch can still play a blocking role on the electrolyte, thereby ensuring the blocking effect on the electrolyte.

[0015] In an optional embodiment, 1mm≤h1≤3mm, 0.2h1≤h2≤0.5h1.

[0016] Beneficial effect: This arrangement can not only ensure that the convex edge blocks the electrolyte, but also ensure that the first notch and the second notch of the explosion-proof valve patch form a ventilation channel, ensuring that the inner cavity of the installation hole and the external air pressure remain consistent.​

[0017] In an optional implementation, the height of the retaining ring protruding from the patch body is h3, 0<h2<h3

[0018] Beneficial effect: Since the height h3 of the retaining ring protruding from the patch body is greater than the depth h2 of the first notch recessed in the convex edge, when the explosion-proof valve patch is assembled on the mounting hole, the retaining ring can block the first notch, so that a circuitous gap is formed between the inner cavity of the mounting hole, the first notch and the outside world, effectively preventing the electrolyte from entering the mounting hole from the first notch, and preventing the explosion-proof valve from being contaminated by the electrolyte. Since the height h3 of the retaining ring protruding from the patch body is less than the height h1 of the convex edge protruding from the cover body, it is possible to reduce the weight of the explosion-proof valve patch while blocking the electrolyte from entering the mounting hole. At the same time, it is possible to ensure that after the explosion-proof valve patch and the mounting hole are assembled, the overlapping area of ​​the retaining ring and the convex edge in the thickness direction of the cover body is guaranteed, and the blocking effect of the retaining ring and the convex edge on the electrolyte after the cooperation.

[0019] In an optional implementation, the wall thickness of the retaining ring is t1, the wall thickness of the retaining ring at the second notch is t2, and 0<t2<t1.

[0020] Beneficial effect: This arrangement ensures that the first notch will not be exposed, ensuring the blocking effect of the retaining ring and the convex edge on the electrolyte.

[0021] In an optional implementation, 0.5mm≤t1≤2mm, 0.3t1≤t2≤0.6t1.

[0022] Beneficial effect: This arrangement can not only ensure that the retaining ring blocks the electrolyte, but also ensure that the first notch and the second notch of the explosion-proof valve patch form a ventilation channel, ensure that the inner cavity of the installation hole and the external air pressure are consistent, and at the same time control the weight of the battery cover assembly.

[0023] In an optional embodiment, the cover plate body is further provided with a liquid injection hole, and the first notch of the mounting hole is provided on a side away from the liquid injection hole.

[0024] Beneficial effect: This arrangement can further improve the effect of blocking the electrolyte.

[0025] In a second aspect, the utility model also provides a power device, comprising the battery in the above technical solution.

[0026] Beneficial effect: Because the power device includes a battery cover assembly, it has the same effect as the battery cover assembly and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] ​In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic structural diagram of a cover plate in a battery cover plate assembly according to an embodiment of the utility model;

[0029] Figure 2 for Figure 1 A top view of the cover plate shown;

[0030] Figure 3 for Figure 2 Sectional view along AA;

[0031] Figure 4 This is a schematic structural diagram of an explosion-proof valve patch in a battery cover assembly according to an embodiment of the utility model;

[0032] Figure 5 for Figure 4 A bottom view of the explosion-proof valve patch is shown;

[0033] Figure 6 for Figure 4 A top view of the explosion-proof valve patch;

[0034] Figure 7 For along Figure 6 Sectional view at the middle BB;

[0035] Figure 8 This is a schematic structural diagram of a battery cover assembly according to an embodiment of the utility model;

[0036] Fig. 9 for Figure 8 A top view of the battery cover assembly shown;

[0037] Fig.10 For along Fig. 9 Sectional view at CC;

[0038] Fig.11 for Fig.10 A partial enlarged view of point D in the middle.

[0039] Description of reference numerals:

[0040] 100, battery cover assembly; 10, cover; 11, cover body; 12, mounting hole; 121, convex edge; 122, first notch; 20, explosion-proof valve patch; 21, patch body; 22, retaining ring; 23, second notch; 30, injection hole; 40, explosion-proof valve; 50, pole. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0042] Combine the following Figures 1 to 11 , describing an embodiment of the utility model.

[0043] According to an embodiment of the utility model, in the first aspect, a battery cover assembly 100 is provided, comprising a cover 10 and an explosion-proof valve patch 20. The cover 10 comprises a cover body 11, the cover body 11 is provided with a mounting hole 12 for mounting an explosion-proof valve 40; the end surface of the mounting hole 12 is provided with a first shielding portion protruding from the cover body 11; the explosion-proof valve patch 20 comprises a patch body 21 and a second shielding portion protruding from the edge of the patch body 21; the explosion-proof valve patch 20 is provided on the mounting hole 12, the second shielding portion is provided outside the first shielding portion, and the first shielding portion and the second shielding portion form a retaining wall around the mounting hole 12; along the thickness direction of the cover body 11, the second shielding portion at least partially overlaps with the first shielding portion, and a ventilation channel is provided between the first shielding portion and the second shielding portion, and the ventilation channel connects the inner cavity of the mounting hole 12 with the outside.

[0044] By providing a first shielding portion on the mounting hole 12 of the cover body 11, the first shielding portion protrudes from the cover body 11, and the explosion-proof valve patch 20 is provided with a second shielding portion protruding from the patch body 21, so that when the explosion-proof valve patch 20 is covered on the mounting hole 12 of the cover body 11, the second shielding portion is provided outside the first shielding portion, and the first shielding portion and the second shielding portion form a retaining wall around the mounting hole 12. Since the second shielding portion and the first shielding portion at least partially overlap along the thickness direction of the cover body 11, a retaining wall is formed between the second shielding portion of the explosion-proof valve patch 20 and the first shielding portion of the mounting hole 12, which can block the electrolyte from entering the mounting hole 12, prevent the electrolyte from contaminating the explosion-proof valve 40 assembled in the mounting hole 12, and protect the explosion-proof valve 40. At the same time, since a ventilation channel is provided between the first shielding part and the second shielding part, the inner cavity of the mounting hole 12 can be connected with the outside, which can be used for helium inspection of the cover plate 10. At the same time, the air pressure inside the explosion-proof valve patch 20 is kept consistent with that outside to avoid affecting the explosion of the explosion-proof valve 40.

[0045] Specifically, the first shielding portion and the second shielding portion are clearance-matched.

[0046] The first shielding portion can be continuous or intermittent along the circumference of the mounting hole 12. Similarly, the second shielding portion can be continuous or intermittent along the circumference of the patch body 21. However, the first shielding portion on the mounting hole 12 and the second shielding portion of the explosion-proof valve patch 20 are staggered in the circumferential direction, so that after the explosion-proof valve patch 20 is assembled in the mounting hole 12, the first shielding portion and the second shielding portion can form a closed retaining wall around the mounting hole 12, which blocks the electrolyte and prevents the electrolyte from entering the mounting hole 12. It can be understood that the larger the circumferential overlapping area between the first shielding portion and the second shielding portion, the better the shielding effect.

[0047] In one embodiment, the first shielding portion includes a closed convex edge 121 disposed around the mounting hole 12 , and the second shielding portion includes a closed retaining ring 22 disposed around the patch body 21 .

[0048] The first shielding part is provided with a closed-loop convex edge 121, and the second shielding part is provided with a closed-loop retaining ring 22. When the second shielding part and the first shielding part are provided, the first shielding part and the second shielding part overlap in their entirety, and the effect of shielding the electrolyte is better.

[0049] In one embodiment, a first notch 122 is provided at the top of the protruding edge 121 , and a second notch 23 is provided at the inner wall of the retaining ring 22 corresponding to the first notch 122 , and the first notch 122 and the second notch 23 are connected to form a ventilation channel.

[0050] A first notch 122 is provided on the convex edge 121, and a second notch 23 is provided on the retaining ring 22. The positions of the first notch 122 and the second notch 23 are correspondingly provided. Thus, when the explosion-proof valve patch 20 is assembled on the mounting hole 12, the first notch 122 and the second notch 23 are assembled correspondingly, and the two form a ventilation channel.

[0051] In one embodiment, the height of the protruding edge 121 protruding from the cover body 11 is h1; the depth of the first notch 122 sunken into the protruding edge 121 is h2, and h2

[0052] Since the depth h2 of the first notch 122 sunken into the convex edge 121 is smaller than the height h1 of the convex edge 121 protruding from the cover body 11, the first notch 122 still protrudes from the cover body 11 and can still block the electrolyte, thereby ensuring the blocking effect on the electrolyte.

[0053] In one embodiment, 1 mm ≤ h1 ≤ 3 mm, 0.2 h1 ≤ h2 ≤ 0.5 h1.

[0054] The height h1 of the convex edge 121 protruding from the cover body 11 is controlled within the range of 1mm to 3mm, and the depth h2 of the first notch 122 recessed in the convex edge 121 is controlled within the range of 0.2h1 to 0.5h1, which can not only ensure that the convex edge 121 has a blocking effect on the electrolyte, but also ensure that the first notch 122 and the second notch 23 of the explosion-proof valve patch 20 form a ventilation channel, ensuring that the inner cavity of the mounting hole 12 and the external air pressure are consistent.

[0055] In one embodiment, the height of the retaining ring 22 protruding from the patch body 21 is h3, where 0<h2<h3

[0056] Since the height h3 of the retaining ring 22 protruding from the patch body 21 is greater than the depth h2 of the first notch 122 sunken into the convex edge 121, when the explosion-proof valve patch 20 is assembled on the mounting hole 12, the retaining ring 22 can block the first notch 122, so that a circuitous gap is formed between the inner cavity of the mounting hole 12, the first notch 122 and the outside world, effectively preventing the electrolyte from entering the mounting hole 12 from the first notch 122, and preventing the explosion-proof valve 40 from being contaminated by the electrolyte. Since the height h3 of the retaining ring 22 protruding from the patch body 21 is less than the height h1 of the convex edge 121 protruding from the cover body 11, it is possible to reduce the weight of the explosion-proof valve patch 20 while blocking the electrolyte from entering the mounting hole 12. At the same time, it is possible to ensure that after the explosion-proof valve patch 20 and the mounting hole 12 are assembled, the overlapping area of ​​the retaining ring 22 and the convex edge 121 in the thickness direction of the cover body 11 can ensure the blocking effect of the retaining ring 22 and the convex edge 121 on the electrolyte after the cooperation.

[0057] ​​In one embodiment, the wall thickness of the retaining ring 22 is t1, and the wall thickness of the retaining ring 22 at the second notch 23 is t2, where 0<t2<t1.

[0058] Since the wall thickness t2 of the retaining ring 22 at the second notch 23 is greater than zero, after the explosion-proof valve patch 20 is assembled on the mounting hole 12, the retaining ring 22 at the second notch 23 can still cover the first notch 122 in the thickness direction of the cover body 11. This arrangement ensures that the first notch 122 will not be exposed, ensuring the retaining ring 22 and the convex edge 121 have a blocking effect on the electrolyte.

[0059] In one embodiment, 0.5 mm ≤ t1 ≤ 2 mm, and 0.3 t1 ≤ t2 ≤ 0.6 t1.

[0060] By controlling the wall thickness t1 of the retaining ring 22 within the range of 0.5mm to 2mm, and controlling the wall thickness t2 of the retaining ring 22 at the second notch 23 within the range of 0.3t1 to 0.6t1, this arrangement can not only ensure that the retaining ring 22 has a blocking effect on the electrolyte, but also ensure that the first notch 122 and the second notch 23 of the explosion-proof valve patch 20 form a ventilation channel, ensure that the inner cavity of the mounting hole 12 and the external air pressure are consistent, and at the same time control the weight of the battery cover assembly 100.

[0061] In one embodiment, the cover body 11 is further provided with a liquid injection hole 30 , and the first notch 122 of the mounting hole 12 is provided at a side away from the liquid injection hole 30 .

[0062] The electrolyte is injected from the injection hole 30, and the first notch 122 of the mounting hole 12 is arranged at a side away from the injection hole 30. Such an arrangement can further improve the effect of blocking the electrolyte.

[0063] In an optional embodiment, an explosion-proof valve 40 is further included, and a stepped groove is provided at one end of the mounting hole 12 away from the convex edge 121, and the explosion-proof valve 40 is arranged in the stepped groove.

[0064] By arranging the explosion-proof valve 40 at one end of the mounting hole 12 away from the convex edge 121 , there is a certain distance between the explosion-proof valve patch 20 and the explosion-proof valve 40 , so as to be away from the electrolyte.

[0065] In one embodiment, a pole 50 is further disposed on the cover plate 10 .

[0066] According to an embodiment of the utility model, in a second aspect, a battery is further provided, comprising a shell, a pole group and a battery cover assembly 100 as described in any one of the above technical solutions, wherein the shell has an open end; the pole group is arranged in the shell; the battery cover assembly 100 is arranged at the open end of the shell to encapsulate the pole group in the shell.

[0067] Since the battery includes a battery cover assembly 100, the explosion-proof valve patch 20 can block the electrolyte from the top and all around, and the probability of the explosion-proof valve 40 being contaminated by the electrolyte is minimized, making the explosion-proof valve 40 safer and more reliable; at the same time, the performance requirements of the explosion-proof valve 40 are not affected.

[0068] In addition, because the battery includes the battery cover assembly 100, all the beneficial effects of the battery cover assembly 100 are obtained, which will not be described in detail herein.

[0069] According to an embodiment of the utility model, in a third aspect, a power device is also provided, comprising the battery in the above technical solution.

[0070] Since the power device includes a battery and has the same effect as the battery, it will not be described in detail here.

[0071] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that: include: A cover plate, the cover plate comprising a cover plate body, the cover plate body being provided with a mounting hole for mounting the explosion-proof valve; an end surface of the mounting hole being provided with a first shielding portion protruding from the cover plate body; An explosion-proof valve patch, the explosion-proof valve patch includes a patch body and a second shielding portion protruding from the edge of the patch body; the explosion-proof valve patch is arranged on the mounting hole, the second shielding portion is arranged outside the first shielding portion, the first shielding portion and the second shielding portion form a retaining wall around the mounting hole; along the thickness direction of the cover body, the second shielding portion at least partially overlaps with the first shielding portion, and a ventilation channel is provided between the first shielding portion and the second shielding portion, and the ventilation channel connects the inner cavity of the mounting hole with the outside world.

2. The battery cover assembly according to claim 1, characterized in that: The first shielding portion includes a closed convex edge arranged around the mounting hole, and the second shielding portion includes a closed retaining ring arranged around the patch body.

3. The battery cover assembly according to claim 2, characterized in that: A first notch is provided at the top of the convex edge, a second notch is provided at the inner wall of the retaining ring corresponding to the first notch, and the first notch and the second notch are butted together to form the ventilation channel.

4. The battery cover assembly according to claim 3, characterized in that: The height of the convex edge protruding from the cover plate body is h1; the depth of the first notch recessed from the convex edge is h2, and h2<h1.

5. The battery cover assembly according to claim 4, characterized in that: 1mm≤h1≤3mm, 0.2h1≤h2≤0.5h1.

6. The battery cover assembly according to claim 4 or 5, characterized in that: The height of the retaining ring protruding from the patch body is h3, 0<h2<h3<h1.

7. The battery cover assembly according to any one of claims 3 to 5, characterized in that: The wall thickness of the retaining ring is t1, and the wall thickness of the retaining ring at the second notch is t2, 0<t2<t1.

8. The battery cover assembly according to claim 7, characterized in that: 0.5mm≤t1≤2mm, 0.3t1≤t2≤0.6t1.

9. The battery cover assembly according to any one of claims 1 to 5, characterized in that: The cover plate body is also provided with a liquid injection hole, and the first notch of the mounting hole is arranged at a side away from the liquid injection hole.

10. A power device, characterized in that: A battery comprising the battery according to any one of claims 1 to 9.

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