Battery shell assembly and battery
By designing explosion-proof valves for projecting and connecting parts in the lithium battery housing assembly, the problems of low production yield and low assembly efficiency of existing lithium batteries are solved, and more efficient assembly and reduced production costs are achieved.
Patent Information
- Application Number
- CN202420718251.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-09
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-04-09
AI Technical Summary
The production yield and assembly efficiency of existing lithium batteries are low, mainly because the fixing method of explosion-proof valves and shells requires precise dimensional coordination and cannot play a positioning role.
A battery case assembly is designed, wherein the housing is provided with a through hole, and the explosion-proof valve includes a projection and a connection part. The projection blocks the through hole, and the connection part is attached to the surface of the housing, and is fixedly connected. The projection plays a positioning role during assembly, reducing the requirements for the dimensional accuracy of the explosion-proof valve.
Through the positioning of the projection, the assembly efficiency is improved, the dimensional accuracy requirements of explosion-proof valves are reduced, the process difficulty is simplified, the production cost is reduced, and the production yield is improved.
Smart Images
Figure CN222883786U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium batteries, and specifically provides a battery housing component and a battery. Background Art
[0002] With the rapid development of new energy vehicles, lithium battery technology has also been rapidly improved.
[0003] Lithium batteries usually include a shell and an explosion-proof valve, and the explosion-proof valve is usually embedded in a through hole on the shell, and the explosion-proof valve and the shell are fixed by butt welding. However, this method requires a very precise clearance between the explosion-proof valve and the through hole, and has very strict requirements on the dimensional accuracy of the explosion-proof valve and the through hole. It also cannot play a positioning role when the battery is assembled into the battery pack box, affecting assembly efficiency.
[0004] Therefore, this field needs a new technical solution to solve the above problems. Utility Model Content
[0005] The utility model aims to solve the above technical problems, that is, to solve the problems of low production yield and low assembly efficiency of existing lithium batteries.
[0006] In a first aspect, the utility model provides a battery shell assembly, comprising a shell and an explosion-proof valve arranged outside the shell, the shell is provided with a through hole, the explosion-proof valve blocks the through hole, the explosion-proof valve comprises a protrusion and a connecting portion arranged between the protrusion and the shell, the connecting portion is abutted against the surface of the shell and fixedly connected to the shell.
[0007] When the above technical solution is adopted, the protrusion can play a positioning role when installed in the box of the battery pack, for example, the protrusion is received in the groove in the box for positioning, etc., thereby improving assembly efficiency.
[0008] On the basis of achieving the above technical effects, by abutting the connecting portion against the surface of the shell, there is no need to accommodate the explosion-proof valve in the through hole of the shell, thereby reducing the dimensional accuracy requirements for the explosion-proof valve, reducing the process difficulty and production cost, and improving the production yield.
[0009] In the preferred technical solution of the above battery housing assembly, the thickness of the protrusion is h 1 , the thickness of the shell is h 2 , where 1≤h 1 / h 2 ≤2.
[0010] When the above technical solution is adopted, the limitation of the above ratio range prevents the thickness of the protrusion from being too small relative to the thickness of the shell, affecting the overall strength, and on the other hand prevents the thickness of the protrusion from being too large relative to the thickness of the shell, resulting in failure to rupture when the air pressure and / or temperature in the shell reaches a critical value, thereby avoiding affecting the safety of the battery.
[0011] In a preferred technical solution of the above battery housing assembly, the protruding portion is provided with a weak portion.
[0012] When the above technical solution is adopted, by arranging the weak portion on the protruding portion, it is possible to prevent the electrolyte from splashing onto the weak portion and corroding it during liquid injection.
[0013] In a preferred technical solution of the above battery housing assembly, the connecting portion is annular and surrounds the protruding portion.
[0014] In the case of adopting the above technical solution, the utility model arranges the connecting portion into a ring shape surrounding the protruding portion, so that the protruding portion can be firmly connected to the shell through the connecting portion, thereby ensuring the stability of the structure.
[0015] In a preferred technical solution of the above-mentioned battery housing assembly, the protruding portion includes an explosion-proof portion and a bent portion, and the bent portion is arranged between the explosion-proof portion and the connecting portion.
[0016] In the case of adopting the above technical solution, the utility model arranges the bending portion so that the explosion-proof portion and the outer surface of the shell are at different heights, so that the protruding portion can play a positioning role.
[0017] In the preferred technical solution of the above battery housing assembly, the explosion-proof portion is provided with the weak portion.
[0018] In the preferred technical solution of the above battery housing assembly, the weak portion is arranged on the outer surface of the explosion-proof portion.
[0019] In the case of adopting the above technical solution, the utility model arranges the weak part on the explosion-proof part, especially on the outer surface of the explosion-proof part, so as to prevent the electrolyte from splashing onto the weak part during liquid injection.
[0020] In the preferred technical solution of the battery housing assembly, 0.1 mm ≤ h 1 ≤1mm; and / or, 0.1mm≤h 2 ≤0.5mm.
[0021] When the above technical solution is adopted, the utility model can prevent the thickness of the explosion-proof valve and the shell from being too small to affect the overall structural strength through the limitation of the above dimensions, and can prevent the thickness of the explosion-proof valve from being too large to affect the safety performance of the battery and prevent the thickness of the shell from being too large to affect the overall energy density.
[0022] In the preferred technical solution of the above battery housing assembly, the weak portion is ring-shaped.
[0023] In a second aspect, the utility model further provides a battery, comprising the above-mentioned battery housing assembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:
[0025] Figure 1 It is a three-dimensional diagram of the battery housing assembly of the utility model;
[0026] Figure 2 It is a top view of the battery housing assembly of the utility model;
[0027] Figure 3 yes Figure 2 The utility model is shown in a partial cross-sectional view of the battery housing assembly along line AA.
[0028] List of reference numerals:
[0029] 1. housing; 11. first wall; 12. second wall; 121. through hole; 13. third wall;
[0030] 2. Explosion-proof valve; 21. Explosion-proof part; 211. Weak part; 22. Bending part; 23. Connecting part. DETAILED DESCRIPTION
[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.
[0032] It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "top", "bottom", "left", "right", "front", "back" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0033] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "connect", and "install" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0034] See first Figures 1 to 3 , Figure 1 It is a three-dimensional diagram of the battery housing assembly of the utility model. Figure 2 1 is a top view of the battery housing assembly of the utility model. Figure 3 It is a cross-sectional view of the AA line of the battery housing assembly of the present invention.
[0035] like Figures 1 to 3 As shown, the battery housing assembly of the present invention includes a housing 1 and an explosion-proof valve 2 .
[0036] like Figures 1 to 3 As shown, the housing 1 includes a first wall 11 , a second wall 12 and a third wall 13 which surround the first wall 11 and are arranged in an interval manner.
[0037] Furthermore, the first wall 11 may be a surface with the largest area or a surface with the smallest area. In the present embodiment, the first wall 11 is a surface with the largest area.
[0038] Two second walls 12 are provided and are respectively located on both sides of the first wall 11 in the length direction. Preferably, the second wall 12 and the first wall 11 are integrally formed.
[0039] Two third walls 13 are provided and are respectively located on both sides of the first wall 11 in the width direction. Preferably, the third wall 13 and the first wall 11 are integrally formed.
[0040] In the direction around the first wall 11, the second wall 12 and the third wall 13 are arranged at intervals and connected in sequence. Preferably, the first wall 11, the second wall 12, and the third wall 13 are integrally formed, thereby ensuring the structural strength and stability of the shell 1, simplifying the processing technology, and improving production efficiency.
[0041] Furthermore, the shell 1 is provided with a through hole 121, which passes through the inner and outer surfaces of the shell 1, so that the inside and outside of the shell 1 can be connected through the through hole 121. The through hole 121 can be circular, elliptical, racetrack-shaped, etc. In the present embodiment, the through hole 121 is in the shape of a racetrack.
[0042] The through hole 121 can be disposed on the first wall 11 of the shell 1, or on the second wall 12 or the third wall 13. In the present embodiment, the through hole 121 is disposed on the second wall 12. For ease of understanding, the following description will take the through hole 121 disposed on the second wall 12 as an example.
[0043] like Figures 1 to 3 As shown, the explosion-proof valve 2 is arranged outside the shell 2 and abuts against the outer surface of the shell 2, so as to facilitate the fixed connection between the explosion-proof valve 2 and the shell 1 and reduce the process difficulty. Preferably, the explosion-proof valve 2 and the shell 1 are fixedly connected by penetration welding.
[0044] Furthermore, the explosion-proof valve 2 blocks the through hole 121 , thereby preventing the electrolyte in the housing 1 from flowing out of the through hole 121 , thereby ensuring the normal use of the battery.
[0045] Preferably, the shape of the explosion-proof valve 2 is compatible with the shape of the through hole 121, and the explosion-proof valve 2 can completely cover the through hole 121 to prevent liquid leakage from the through hole 121. In the present embodiment, the through hole 121 is in a runway shape, and the explosion-proof valve 2 is also in a runway shape, which not only facilitates the corresponding assembly of the explosion-proof valve 2 to the through hole 121, but also reduces materials and costs.
[0046] Furthermore, the explosion-proof valve 2 includes a protrusion and a connection portion 23, the connection portion 23 is annular and is arranged around the protrusion, the connection portion 23 is abutted against the outer surface of the housing 1, that is, the outer surface of the second wall 12, and the connection portion 23 is arranged around the through hole 121, so that the through hole 121 can be completely blocked. Preferably, the connection portion 23 is abutted against the outer surface of the second wall 12 and is fixedly connected to the second wall 12 by penetration welding, thereby realizing a stable connection between the explosion-proof valve 2 and the housing 1, and there is no need to accommodate the explosion-proof valve 2 in the through hole 121, the dimensional accuracy requirements of the connection portion 23 and the through hole 121 are low, the process difficulty is simplified, and the production yield is improved.
[0047] Furthermore, the thickness of the explosion-proof valve 2, that is, the thickness of the protruding portion, is h 1 , the thickness of shell 1 is h 2 , where 1≤h 1 / h 2 ≤2. By limiting the thickness ratio of the protrusion and the shell 1 as above, on the one hand, it can prevent the thickness of the protrusion from being too small relative to the thickness of the shell 1, resulting in weak overall strength, and on the other hand, it can prevent the thickness of the protrusion from being too large relative to the thickness of the shell 1, resulting in failure to rupture in time, thereby ensuring the safety of the battery while taking into account the structural strength.
[0048] Furthermore, where 0.1 mm ≤ h 2 ≤0.5mm, by measuring the shell thickness h 2The thickness of the shell 1 is limited to a range of, on the one hand, it can prevent the shell 1 from being too thin, resulting in a weak overall structural strength, thereby affecting the safety of the battery; on the other hand, it can prevent the shell 1 from being too thick, resulting in excessively high shell 1 costs and excessively large occupied volume, thereby affecting the overall energy density of the battery. The above-mentioned limitation of the thickness range of the shell 1 can maximize the energy density of the battery while ensuring structural strength and safety.
[0049] Furthermore, where 0.1 mm ≤ h 1 ≤1mm, by measuring the thickness of the protruding part h 1 On the one hand, it can prevent the thickness of the protrusion from being too small, which leads to a reduction in its structural strength, or even rupture when the air pressure and / or temperature in the shell 1 do not reach a critical value, thereby affecting the overall structural stability; on the other hand, it can prevent the thickness of the explosion-proof valve 2 from being too large, which leads to an excessively large structural strength and the inability to rupture, that is, it will not rupture when the air pressure and / or temperature in the shell 1 reaches a critical value, thereby affecting the overall safety.
[0050] Furthermore, the connecting portion 23 is in the shape of a plate, so that it can be completely abutted against the outer surface of the second wall 12 to achieve a stable contact between the two, and the connecting portion 23 is arranged on the outer side of the second wall 12 to facilitate penetration welding and fixation, thereby reducing the difficulty of the process.
[0051] Further, the protrusion includes an explosion-proof portion 21 and a curved portion 22. The explosion-proof portion 21 is in the shape of a flat plate, preferably, the explosion-proof portion 21 is directly opposite to the through hole 121, and more preferably, the shape of the explosion-proof portion 21 corresponds to the shape of the through hole 121, that is, in this embodiment, the through hole 121 is in the shape of a runway, and the explosion-proof portion 21 is also in the shape of a runway.
[0052] Furthermore, the curved portion 22 is annular and is located between the explosion-proof portion 21 and the connecting portion 23 . The cross section of the curved portion 22 is curved. One end of the curved portion 22 is connected to the explosion-proof portion 21 , and the other end of the curved portion 22 is connected to the connecting portion 23 .
[0053] Preferably, the explosion-proof portion 21, the bending portion 22 and the connecting portion 23 are integrally formed, thereby ensuring the stability of the structure and simplifying the process steps.
[0054] On the one hand, the provision of the protrusion can play a positioning role when the battery is assembled into the box of the battery pack, such as being accommodated in a groove in the box, etc. On the other hand, it can prevent the electrolyte from splashing onto the weak portion 211 on the outer surface of the protrusion during liquid injection and causing corrosion. For example, when an injection hole is provided on one side of the through hole 121 on the second wall 12, due to the provision of the protrusion, the height of the weak portion 211 is higher than the height of the outer surface of the second wall 12, and thus the weak portion 211 will not be splashed when liquid is injected toward the injection hole.
[0055] Furthermore, a weak portion 211 is provided on the outer surface of the explosion-proof portion 21, and the thickness of the weak portion 211 is less than the thickness of the explosion-proof portion 21, so that when the air pressure and / or temperature in the shell 1 reaches a critical value, the weak portion 211 can rupture to release gas and electrolyte to ensure safety.
[0056] Preferably, the weak portion 211 is a closed ring, so that it can not only rupture when the air pressure and / or temperature in the shell 1 reaches a critical value, but also is easy to process and manufacture, with low process difficulty.
[0057] Those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.
[0058] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.
Claims
1. A battery housing assembly, characterized in that: The invention comprises a shell and an explosion-proof valve arranged outside the shell, wherein the shell is provided with a through hole, the explosion-proof valve covers the through hole, and the explosion-proof valve comprises a protrusion and a connecting part arranged between the protrusion and the shell, wherein the connecting part is close to the surface of the shell and fixedly connected to the shell.
2. The battery housing assembly according to claim 1, characterized in that: The thickness of the protrusion is h1, and the thickness of the shell is h2, wherein 1≤h1 / h2≤2.
3. The battery housing assembly according to claim 2, characterized in that: The protruding portion is provided with a weak portion.
4. The battery housing assembly according to claim 3, characterized in that: The connecting portion is annular and surrounds the protruding portion.
5. The battery housing assembly according to claim 4, characterized in that: The protruding portion includes an explosion-proof portion and a bent portion, and the bent portion is arranged between the explosion-proof portion and the connecting portion.
6. The battery housing assembly according to claim 5, characterized in that: The explosion-proof portion is provided with the weak portion.
7. The battery housing assembly according to claim 6, characterized in that: The weak portion is arranged on the outer surface of the explosion-proof portion.
8. The battery housing assembly according to claim 2, characterized in that: in, 0.1mm≤h1≤1mm; and / or, 0.1mm≤h2≤0.5mm.
9. The battery housing assembly according to claim 7, characterized in that: The weak portion is ring-shaped.
10. A battery, characterized in that: A battery casing assembly comprising the battery casing assembly according to any one of claims 1 to 9.