Battery structure assembly and battery
By installing a high-temperature resistant insulating ring on the terminal post, the problem of heat loss inside the battery during fast charging is solved, which prevents insulation failure and short circuits and improves battery safety.
Patent Information
- Application Number
- CN202423049899.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-12-11
AI Technical Summary
During fast charging, the heat inside the battery is difficult to dissipate, causing the temperature of the terminal base plate to rise, the elastic insulation component to melt and fail, resulting in a short circuit between the terminal and the outer casing.
A high-temperature resistant insulating ring is used to be fitted onto the pole post and sandwiched between the sealed insulating component and the base plate to block heat transfer and serve as an additional insulating barrier to prevent short circuits between the pole post base plate and the end plate.
It effectively prevents insulation failure, prevents short circuits, and improves battery safety. The high-temperature resistant insulation ring maintains stable insulation performance even at high temperatures.
Smart Images
Figure CN223743858U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a battery structure component and a battery. Background Technology
[0002] To achieve fast charging of battery cells, a high overcurrent structure is typically designed. However, the large current during fast charging generates significant heat, especially inside the battery where heat is difficult to dissipate and the temperature rises rapidly. This increased temperature at the base plate of the terminals affects the elastic insulation sandwiched between the base plate and the battery casing. When the base plate of the terminals is too hot, the elastic insulation melts and fails, causing a short circuit between the terminals and the casing. Utility Model Content
[0003] One objective of this invention is to provide a battery structure assembly that can prevent insulation failure and short circuits.
[0004] To achieve this objective, the present invention adopts the following technical solution:
[0005] A battery structure assembly is provided, comprising:
[0006] The outer casing has a first through hole on its first end plate.
[0007] A sealing and insulating component, wherein the portion of the sealing and insulating component located within the first through hole encloses a second through hole;
[0008] The terminal post includes a main body and a base plate. The main body is inserted into the second through hole, the base plate is located inside the battery, and the sealing and insulating assembly is sandwiched between the base plate and the first end plate.
[0009] A high-temperature resistant insulating ring is sleeved on the pole post, and part of the high-temperature resistant insulating ring is sandwiched between the sealing insulation component and the base plate.
[0010] Optionally, the vertical distance between the outer ring of the high-temperature insulating ring and the axial direction of the pole post is greater than the vertical distance between the side of the base plate and the axial direction of the pole post;
[0011] And / or, the vertical distance between the inner ring of the high-temperature insulating ring and the axial direction of the pole post is less than the vertical distance between the inner wall of the second through hole and the axial direction of the pole post.
[0012] Optionally, the high-temperature resistant insulating ring includes an annular portion and a tubular portion connected together. The annular portion is sandwiched between the sealing insulating assembly and the base plate, and the tubular portion is sandwiched between the inner wall of the second through hole and the side wall of the main body.
[0013] Optionally, the thickness 'a' of the high-temperature resistant insulating ring satisfies the condition 0.3mm ≤ a ≤ 0.5mm;
[0014] And / or, the outer ring of the high-temperature resistant insulating ring is circular, and the outer ring diameter b of the high-temperature resistant insulating ring satisfies 15mm≤b≤23mm;
[0015] And / or, the distance c between the outer ring and the inner ring of the high-temperature resistant insulating ring satisfies that c ≥ 3.15 mm;
[0016] And / or, the height d of the high-temperature resistant insulating ring along the axial direction of the pole post satisfies d≥0.85mm.
[0017] Optionally, the high-temperature resistant insulating ring is a ring-shaped structure made of ceramic material.
[0018] Optionally, a limiting groove is formed circumferentially on the side wall of the main body, and the high-temperature resistant insulating ring is located at the limiting groove along the axial direction of the pole post.
[0019] Optionally, the terminal post includes a riveting portion located outside the battery, and the sealing and insulating assembly includes a first insulating member sandwiched between the end face of the riveting portion facing the inside of the battery and the end face of the first end plate facing the outside of the battery.
[0020] Optionally, the first insulating element is a sheet structure made of ceramic material.
[0021] Optionally, the sealing and insulating assembly further includes a sealing ring, which is sleeved on the main body. The sealing ring partially has an interference fit with a stepped surface on the side wall of the main body facing the interior of the battery. The sealing ring partially has an interference fit between the side wall of the main body and the inner wall of the first through hole. The sealing ring partially has an interference fit between the end face of the first end plate facing the interior of the battery and the high-temperature resistant insulating ring.
[0022] Another objective of this invention is to provide a battery that can prevent insulation failure and short circuits.
[0023] To achieve this objective, the present invention adopts the following technical solution:
[0024] A battery is provided, comprising a cell and the aforementioned battery structure assembly, wherein the cell is located within the housing.
[0025] The beneficial effects of this utility model are:
[0026] This utility model provides a battery structural assembly, including a shell, a sealing and insulating component, terminals, and a high-temperature resistant insulating ring. The shell has a first through-hole on its first end plate, and the portion of the sealing and insulating component within the first through-hole forms a second through-hole. The terminal includes a main body and a base plate. The main body is inserted into the second through-hole, and the base plate is located inside the battery. The sealing and insulating component is partially sandwiched between the base plate and the first end plate. The high-temperature resistant insulating ring is fitted onto the terminal, with a portion sandwiched between the sealing and insulating component and the base plate. The high-temperature resistant insulating ring can block heat transfer to the sealing and insulating component when the base plate temperature rises, helping to delay the melting of the sealing and insulating component. Even if the sealing and insulating component melts, the high-temperature resistant insulating ring acts as another insulating barrier, helping to prevent short circuits between the terminal base plate and the first end plate, thereby contributing to battery safety.
[0027] This invention also provides a battery, including a battery cell and the aforementioned battery structure assembly, with the battery cell located inside the casing. This battery can prevent insulation failure and short circuits. Attached Figure Description
[0028] Figure 1 This is an exploded view of the battery structure assembly provided in this embodiment of the present invention;
[0029] Figure 2 This is a cross-sectional view of the battery structure assembly provided in an embodiment of this utility model;
[0030] Figure 3 yes Figure 2 Enlarged view of point A in the middle.
[0031] In the picture:
[0032] 1. Outer shell; 11. First end plate; 111. First through hole;
[0033] 2. Sealed insulation assembly; 21. First insulating component; 22. Sealing ring; 23. Second insulating component;
[0034] 3. Pole post; 31. Main body; 311. Limiting groove; 32. Base plate; 33. Riveting part;
[0035] 4. High-temperature resistant insulating ring; 41. Annular part; 42. Tubular part. Detailed Implementation
[0036] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the drawings, not all of them.
[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0039] like Figures 1-3 As shown, the battery structure assembly of this embodiment includes a housing 1, a sealing and insulating component 2, a terminal post 3, and a high-temperature resistant insulating ring 4. The housing 1 has a first through-hole 111 on its first end plate 11, and the portion of the sealing and insulating component 2 located within the first through-hole 111 forms a second through-hole. The terminal post 3 includes a main body 31 and a base plate 32. The main body 31 is inserted into the second through-hole, and the base plate 32 is located inside the battery. The sealing and insulating component 2 is partially sandwiched between the base plate 32 and the first end plate 11. The high-temperature resistant insulating ring 4 is fitted onto the terminal post 3, and is partially sandwiched between the sealing and insulating component 2 and the base plate 32. The high-temperature resistant insulating ring 4 can block heat transfer to the sealing and insulating component 2 when the temperature of the base plate 32 rises, helping to delay the melting of the sealing and insulating component 2. Even if the sealing and insulating component 2 melts, the high-temperature resistant insulating ring 4 acts as another insulating barrier, helping to prevent short circuits between the base plate 32 and the first end plate 11 of the terminal post 3, thereby helping to ensure battery safety.
[0040] Optionally, the vertical distance between the outer ring of the high-temperature insulating ring 4 and the axial direction of the pole post 3 is greater than the vertical distance between the side of the base plate 32 and the axial direction of the pole post 3. Optionally, the vertical distance between the inner ring of the high-temperature insulating ring 4 and the axial direction of the pole post 3 is less than the vertical distance between the inner wall of the second through hole and the axial direction of the pole post 3. That is, the high-temperature insulating ring 4 covers the entire contact area between the base plate 32 and the sealing insulation component 2, which can ensure that when the sealing insulation component 2 melts, there will be no short circuit between the base plate 32 and the first end plate 11.
[0041] Optionally, the high-temperature resistant insulating ring 4 includes an annular portion 41 and a tubular portion 42 connected to each other. The annular portion 41 is sandwiched between the sealing insulating assembly 2 and the base plate 32, and the annular portion 41 is generally sheet-like. The tubular portion 42 is sandwiched between the inner wall of the second through hole and the side wall of the main body 31. The tubular portion 42 can prevent short circuits in some areas between the sealing insulating assembly 2 and the main body 31. The tubular portion 42 can also prevent the annular portion 41 from deflecting to a certain extent, so as to ensure that the annular portion 41 is attached to the base plate 32 and prevent gaps between the two. The axial length of the electrode post 3 inside the battery exceeds the design value, resulting in insufficient height of the riveted portion 33 of the electrode post 3.
[0042] like Figure 3 As shown, optionally, the thickness 'a' of the high-temperature resistant insulating ring 4 satisfies 0.3mm ≤ a ≤ 0.5mm, meaning that the thicknesses of both the annular portion 41 and the tubular portion 42 meet the above-mentioned value range. If the thickness of the high-temperature resistant insulating ring 4 is too small, it is prone to cracking and failure, and the high-temperature resistance effect cannot meet the design requirements. If the thickness of the high-temperature resistant insulating ring 4 is too large, it will occupy the design space, making the thickness of the sealing ring 22 thinner, resulting in a reduction in the compression of the sealing ring 22 and affecting the sealing performance.
[0043] Optionally, the outer ring of the high-temperature resistant insulating ring 4 is circular, and the outer ring diameter b of the high-temperature resistant insulating ring 4 satisfies 15mm ≤ b ≤ 23mm. Preferably, the outer ring diameter b of the high-temperature resistant insulating ring 4 is 19mm to match the dimensions of the base plate 32 of the pole post 3. Of course, in other embodiments, the outer ring diameter of the high-temperature resistant insulating ring 4 can be adjusted according to the dimensions of the pole post 3.
[0044] Optionally, the distance c between the outer ring and the inner ring of the high-temperature resistant insulating ring 4 satisfies the condition that c ≥ 3.15 mm. If the distance c between the outer ring and the inner ring of the high-temperature resistant insulating ring 4 is too small, it cannot guarantee coverage of the entire area between the base plates 32.
[0045] Optionally, the height d of the high-temperature insulating ring 4 along the axial direction of the pole post 3 satisfies d ≥ 0.85 mm. If the height d of the high-temperature insulating ring 4 along the axial direction of the pole post 3 is too small, the tubular portion 42 will not exist.
[0046] Optionally, the high-temperature resistant insulating ring 4 is a ring-shaped structure made of ceramic material. The ceramic material ensures the high-temperature resistance and insulation performance of the high-temperature resistant insulating ring 4, ensuring that the high-temperature resistant insulating ring 4 will not melt even when the terminal post 3 heats up rapidly during fast charging, and that it still has stable insulation performance at high temperatures.
[0047] Optionally, in this embodiment, the high-temperature resistant insulating ring 4 is made of a mixture of ceramic and polypropylene. Insulating rings made of pure ceramic lack elasticity and have poor sealing performance. Furthermore, testing has shown that existing plastic parts can only maintain stable insulation performance below 300°C; once the temperature exceeds 300°C, the plastic parts melt and fail, causing a short circuit. The high-temperature resistant insulating ring 4 provided in this embodiment, being a mixture of ceramic and polypropylene, balances both sealing performance and high-temperature insulation.
[0048] Optionally, the ceramic used in this embodiment is A-95 alumina ceramic, which has good insulation properties under high temperature conditions.
[0049] Optionally, the mass ratio of ceramic to polypropylene is 9:1, meaning the high-temperature insulating ring 4 contains 90% ceramic and 10% polypropylene by mass. Testing shows that the high-temperature insulating ring 4 with the above ratio maintains stable insulation performance at 300℃, and even at 500℃, it remains unmelted for 60 seconds, preventing short circuits between the terminal 3 and the outer casing 1, significantly improving battery safety. Furthermore, test results show that when the mass ratio of ceramic to polypropylene is lower than 9:1 (i.e., the ceramic content decreases and the polypropylene content increases), the high-temperature insulating effect of the resulting high-temperature insulating ring 4 decreases. This is because at high temperatures, the polypropylene portion of the high-temperature insulating ring 4 melts, reducing the overall thickness of the remaining ceramic material and decreasing insulation performance.
[0050] Optionally, a limiting groove 311 is provided circumferentially on the side wall of the main body 31, and the high-temperature resistant insulating ring 4 is located at the limiting groove 311 along the axial direction of the pole post 3. The limiting groove 311 can limit the position of the high-temperature resistant insulating ring 4 along the axial direction of the pole post 3, preventing the high-temperature resistant insulating ring 4 from misaligning and failing, or occupying too much space.
[0051] Optionally, in this embodiment, the terminal post 3 includes a riveting portion 33, which is located outside the battery. Of course, in other embodiments, the terminal post 3 can also be fixed to the first through hole 111 of the outer casing 1 by providing a riveting block or by applying adhesive.
[0052] Optionally, the sealing and insulating assembly 2 includes a first insulating member 21, which is sandwiched between the end face of the riveting part 33 facing the inside of the battery and the end face of the first end plate 11 facing the outside of the battery, so as to ensure insulation between the riveting part 33 and the first end plate 11.
[0053] Optionally, the first insulating element 21 is a sheet structure made of ceramic material. Similarly, the ceramic material can ensure the high temperature resistance and insulation performance of the first insulating element 21, ensuring that the first insulating element 21 will not melt even when the electrode post 3 heats up rapidly during fast charging, and that it still has stable insulation performance at high temperatures.
[0054] Optionally, the sealing and insulating assembly 2 further includes a sealing ring 22, which is fitted onto the main body 31. To ensure the sealing performance of the sealing ring 22, the compression amount needs to be guaranteed at various points on the sealing ring 22. The sealing ring 22 is partially interference-fitted with the stepped surface on the side wall of the main body 31 facing the inside of the battery. The sealing ring 22 is partially interference-fitted between the side wall of the main body 31 and the inner wall of the first through hole 111. The sealing ring 22 is partially interference-fitted between the end face of the first end plate 11 facing the inside of the battery and the high-temperature resistant insulating ring 4.
[0055] Optionally, in this embodiment, the cross-section of the sealing ring 22 is L-shaped.
[0056] Optionally, the sealing and insulating assembly 2 further includes a second insulating member 23, which is attached to the side of the first end plate 11 facing the inside of the battery. Optionally, the second insulating member 23 has a third through hole, the inner wall of which circumferentially abuts the outer ring of the sealing ring 22 to jointly form a first layer of insulation protection between the base plate 32 and the first end plate 11.
[0057] Optionally, the first end plate 11 can be a top cover, or the first end plate 11 can be an end face on the housing.
[0058] The manufacturing method of the above-mentioned battery structure component includes: using a stirring device, mixing ceramic powder and polypropylene particles evenly according to a mass ratio of ceramic to polypropylene of 9:1, and then using an injection molding machine to injection mold the mixed material to form a high-temperature resistant insulating ring 4.
[0059] Optionally, the mold temperature should be greater than or equal to 230°C, and the injection temperature of the injection molding machine should be greater than or equal to 410°C to ensure that the polypropylene is fully melted and that the material is evenly mixed throughout the high-temperature insulating ring 4.
[0060] Optionally, a high-temperature resistant insulating ring 4 can be formed by injection molding directly on the pole post 3 to ensure that the high-temperature resistant insulating ring 4 can be located in the limiting groove 311 of the pole post 3.
[0061] The aforementioned battery structure assembly manufacturing method also includes the assembly process of each component. Optionally, it further includes assembling the sealing ring 22 onto the terminal post 3 to form a terminal post assembly including the terminal post 3, the sealing ring 22, and the high-temperature resistant insulating ring 4. Simultaneously, the second insulating member 23 is attached to the end face of the first end plate 11 facing the inside of the battery. Then, the terminal post assembly is placed into the first through hole 111 of the outer casing 1, and the first insulating member 21 is fitted onto the portion of the terminal post 3 extending out of the outer casing 1. Finally, the end of the terminal post 3 is riveted to the outer end face of the first end plate 11 to form a riveting part 33, ensuring a firm connection of the terminal post 3 to the first end plate 11, while simultaneously pressing the sealing insulating member 2 and the high-temperature resistant insulating ring 4. The battery structure assembly manufactured using this method can prevent insulation failure and short circuits.
[0062] This embodiment also provides a battery, including a battery cell and the aforementioned battery structure assembly, with the battery cell located within the casing 1. Optionally, in this embodiment, the battery is a cylindrical battery; however, in other embodiments, the battery may also be a prismatic battery. This battery can prevent insulation failure and short circuits.
[0063] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A battery structure assembly, characterized by, The application relates to a battery pole, which comprises the following parts: a shell (1), a first end plate (11) of the shell (1) being provided with a first through hole (111); a sealing and insulating assembly (2), a part of the sealing and insulating assembly (2) being located in the first through hole (111) and forming a second through hole; a pole (3), which comprises a main body (31) and a bottom plate (32), the main body (31) being inserted into the second through hole, the bottom plate (32) being located in the interior of a battery, and the sealing and insulating assembly (2) being partially clamped between the bottom plate (32) and the first end plate (11); and a high-temperature-resistant insulating ring (4), which is sleeved on the pole (3) and is partially clamped between the sealing and insulating assembly (2) and the bottom plate (32). The vertical distance between the outer ring of the high-temperature-resistant insulating ring (4) and the axial direction of the pole (3) is greater than the vertical distance between the side of the bottom plate (32) and the axial direction of the pole (3). The vertical distance between the inner ring of the high-temperature-resistant insulating ring (4) and the axial direction of the pole (3) is less than the vertical distance between the inner wall of the second through hole and the axial direction of the pole (3). The high-temperature-resistant insulating ring (4) comprises a ring-shaped part (41) and a tubular part (42), the ring-shaped part (41) being clamped between the sealing and insulating assembly (2) and the bottom plate (32), and the tubular part (42) being clamped between the inner wall of the second through hole and the side wall of the main body (31). The thickness a of the high-temperature-resistant insulating ring (4) satisfies 0.3mm<=a<=0.5mm.
2. The battery structural assembly of claim 1, wherein, The outer ring of the high-temperature-resistant insulating ring (4) is circular, and the outer ring diameter b of the high-temperature-resistant insulating ring (4) satisfies 15mm<=b<=23mm. The distance c between the outer ring of the high-temperature-resistant insulating ring (4) and the inner ring of the high-temperature-resistant insulating ring (4) satisfies c>=3.15mm.
3. The battery structural assembly of claim 1, wherein, The height d of the high-temperature-resistant insulating ring (4) along the axial direction of the pole (3) satisfies d>=0.85mm.
4. The battery structural assembly of claim 1, wherein, The high-temperature-resistant insulating ring (4) is a ring-shaped structure made of ceramic material. A limiting groove (311) is circumferentially formed on the side wall of the main body (31), and the high-temperature-resistant insulating ring (4) is located at the limiting groove (311) along the axial direction of the pole (3). The pole (3) comprises a riveting part (33) located outside the battery, the sealing and insulating assembly (2) comprises a first insulating piece (21) clamped between the end face of the riveting part (33) towards the interior of the battery and the end face of the first end plate (11) towards the exterior of the battery. The first insulating piece (21) is a sheet-shaped structure made of ceramic material.
5. The battery structural assembly of claim 1, wherein, 6. The battery structural assembly of any one of claims 1-5, wherein, 7. The battery structural assembly of any one of claims 1-5, wherein, 8. The battery structural assembly of claim 7, wherein, 9. The battery structural assembly of any one of claims 1-5, wherein, The sealing and insulating assembly (2) further comprises a sealing ring (22) sleeved on the main body part (31), a part of the sealing ring (22) is in interference fit with a step surface on the sidewall of the main body part (31) facing the inside of the battery, the part of the sealing ring (22) is in interference clamping between the sidewall of the main body part (31) and the inner wall of the first through hole (111), and the part of the sealing ring (22) is in interference clamping between the end surface of the first end plate (11) facing the inside of the battery and the high-temperature-resistant insulating ring (4).
10. A battery characterized by The battery structure assembly according to any one of claims 1-9 is used in a battery comprising an electric core and the battery structure assembly.