Battery structure assembly, battery and manufacturing method

Abstract

The invention relates to the technical field of energy storage equipment, in particular to a battery structure assembly, a battery and a manufacturing method, and the battery structure assembly comprises a shell, a sealing insulation assembly, a pole and a high-temperature-resistant insulation ring. A first end plate of the shell is provided with a first through hole, and the part, located in the first through hole, of the sealing insulation assembly forms a second through hole. The pole comprises a main body part and a bottom plate, the main body part is inserted into the second through hole, the bottom plate is located in the battery, and the sealing insulation assembly is partially clamped between the bottom plate and the first end plate. The high-temperature-resistant insulating ring is arranged on the pole in a sleeving manner, and is partially clamped between the sealing insulating assembly and the bottom plate. The battery comprises a battery cell and the battery structure assembly, the battery cell is located in the shell, and the battery can prevent short circuit. The manufacturing method is applied to manufacturing the battery structure assembly and comprises the following steps: uniformly mixing the ceramic powder and the polypropylene particles by adopting stirring equipment, and then carrying out injection molding on the mixed material by adopting an injection molding machine to form the high-temperature-resistant insulating ring.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage equipment, and in particular to a battery structure component, a battery and a manufacturing method. Background Art

[0002] In order to achieve fast charging of the battery cell, it is generally designed with a large overcurrent structure. However, the current is large during fast charging, which will generate high heat, especially inside the battery. The heat is not easy to dissipate and the temperature will rise rapidly. The temperature at the bottom plate of the pole increases, which will affect the elastic insulating part sandwiched between the bottom plate and the outer shell of the battery. When the temperature of the bottom plate of the pole is high, the elastic insulating part melts and fails, causing a contact short circuit between the pole and the outer shell. Summary of the invention

[0003] An object of the present invention is to provide a battery structure assembly that can prevent insulation failure and short circuit.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A battery structure assembly is provided, comprising:

[0006] A shell, wherein a first through hole is formed on a first end plate of the shell;

[0007] A sealing insulating component, wherein a portion of the sealing insulating component located in the first through hole surrounds and forms a second through hole;

[0008] A pole, comprising a main body and a bottom plate, wherein the main body is inserted into the second through hole, the bottom plate is located inside the battery, and the sealing insulation component is partially sandwiched between the bottom plate and the first end plate;

[0009] A high temperature resistant insulating ring is sleeved on the pole, and a portion of the high temperature resistant insulating ring is sandwiched between the sealing insulating assembly and the bottom plate.

[0010] Optionally, a vertical distance between an outer ring of the high temperature resistant insulating ring and the axial direction of the pole is greater than a vertical distance between a side of the bottom plate and the axial direction of the pole;

[0011] And / or, a vertical distance between an inner ring of the high temperature resistant insulating ring and the axial direction of the pole is smaller than a vertical distance between an inner wall of the second through hole and the axial direction of the pole.

[0012] Optionally, the high temperature resistant insulating ring includes an annular portion and a tubular portion connected to each other, the annular portion is clamped between the sealing insulating assembly and the bottom plate, and the tubular portion is clamped 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, 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 of the high temperature resistant insulating ring and the inner ring of the high temperature resistant insulating ring satisfies, c≥3.15mm;

[0016] And / or, a height d of the high temperature resistant insulating ring along the axial direction of the pole satisfies: d≥0.85 mm.

[0017] Optionally, the material of the high temperature resistant insulating ring is a mixture of ceramic and polypropylene, and the mass ratio of ceramic to polypropylene is 9:1.

[0018] Optionally, a limiting groove is circumferentially provided 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.

[0019] Optionally, the pole includes a riveted portion, which is located outside the battery. The sealed insulating assembly includes a first insulating member, which is clamped between an end surface of the riveted portion facing the interior of the battery and an end surface of the first end plate facing the outside of the battery. The first insulating member is a sheet structure of ceramic material.

[0020] Optionally, the sealing and insulating assembly further comprises a sealing ring, which is sleeved on the main body, the sealing ring portion is interference fit with a step surface on the side wall of the main body facing the interior of the battery, the sealing ring portion interference clamp is arranged between the side wall of the main body and the inner wall of the first through hole, and the sealing ring portion interference clamp is arranged between the end surface of the first end plate facing the interior of the battery and the high temperature resistant insulating ring.

[0021] Another object of the present invention is to provide a battery that can prevent insulation failure and short circuit.

[0022] To achieve this object, the present invention adopts the following technical solutions:

[0023] A battery is provided, comprising a battery core and the above-mentioned battery structure assembly, wherein the battery core is located in the housing.

[0024] Another object of the present invention is to provide a manufacturing method, wherein the battery structure assembly manufactured by the manufacturing method can prevent insulation failure and short circuit.

[0025] To achieve this object, the present invention adopts the following technical solutions:

[0026] A manufacturing method is provided for manufacturing the above-mentioned battery structure assembly, the manufacturing method comprising:

[0027] The ceramic powder and the polypropylene particles are mixed evenly by using a stirring device, and then the mixed material is injection-molded by using an injection molding machine to form the high-temperature resistant insulating ring.

[0028] Beneficial effects of the present invention:

[0029] The present invention provides a battery structure component, including a shell, a sealing insulating component, a pole and a high temperature resistant insulating ring. A first through hole is provided on the first end plate of the shell, and the part of the sealing insulating component located in the first through hole is arranged to form a second through hole. The pole includes a main body and a bottom plate, the main body is inserted in the second through hole, the bottom plate is located inside the battery, and the sealing insulating component is partially sandwiched between the bottom plate and the first end plate. The high temperature resistant insulating ring is sleeved on the pole, and the high temperature resistant insulating ring is partially sandwiched between the sealing insulating component and the bottom plate. The high temperature resistant insulating ring can block the heat from being transferred to the sealing insulating component when the temperature of the bottom plate rises, which helps to delay the melting of the sealing insulating component. Even if the sealing insulating component melts, the high temperature resistant insulating ring serves as another insulating barrier, which helps to prevent the pole bottom plate from contacting and short-circuiting with the first end plate, thereby helping to ensure the safety of the battery.

[0030] The present invention also provides a battery, comprising a battery core and the above-mentioned battery structure assembly, wherein the battery core is located in a housing. The battery can prevent insulation failure and short circuit.

[0031] The present invention also provides a manufacturing method for manufacturing the above-mentioned battery structure assembly, the manufacturing method comprising: using a stirring device to evenly mix ceramic powder and polypropylene particles, and then using an injection molding machine to injection mold the mixed material to form a high temperature resistant insulation ring. The battery structure assembly manufactured using the manufacturing method can prevent insulation failure and short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is an exploded view of a battery structure assembly provided by an embodiment of the present invention;

[0033] Figure 2 is a cross-sectional view of a battery structure assembly provided by an embodiment of the present invention;

[0034] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0035] In the figure:

[0036] 1. housing; 11. first end plate; 111. first through hole;

[0037] 2. Sealing insulation assembly; 21. First insulating member; 22. Sealing ring; 23. Second insulating member;

[0038] 3. Pole; 31. Main body; 311. Limiting groove; 32. Bottom plate; 33. Riveting part;

[0039] 4. High temperature resistant insulating ring; 41. Ring-shaped portion; 42. Tubular portion. DETAILED DESCRIPTION

[0040] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and implementation methods. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] like Figure 1-Figure 3As shown, the battery structure assembly of this embodiment includes a shell 1, a sealing insulation assembly 2, a pole 3 and a high temperature resistant insulation ring 4. Among them, a first through hole 111 is opened on the first end plate 11 of the shell 1, and the part of the sealing insulation assembly 2 located in the first through hole 111 is surrounded to form a second through hole. The pole 3 includes a main body 31 and a bottom plate 32, the main body 31 is inserted in the second through hole, the bottom plate 32 is located inside the battery, and the sealing insulation assembly 2 is partially sandwiched between the bottom plate 32 and the first end plate 11. The high temperature resistant insulation ring 4 is sleeved on the pole 3, and the high temperature resistant insulation ring 4 is partially sandwiched between the sealing insulation assembly 2 and the bottom plate 32. The high temperature resistant insulation ring 4 can block the heat from being transferred to the sealing insulation assembly 2 when the temperature of the bottom plate 32 rises, which helps to delay the melting of the sealing insulation assembly 2. Even if the sealing insulation assembly 2 melts, the high temperature resistant insulation ring 4 acts as another insulation barrier, which helps to prevent the bottom plate 32 of the pole 3 from contacting and short-circuiting with the first end plate 11, thereby helping to ensure the safety of the battery.

[0044] Optionally, 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. Optionally, 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. That is, the high temperature resistant insulating ring 4 covers the entire contact area between the bottom plate 32 and the sealed insulating component 2, which can ensure that when the sealed insulating component 2 melts, there will be no contact short circuit between the bottom plate 32 and the first end plate 11.

[0045] 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 bottom plate 32, the annular portion 41 is in the shape of a sheet, and 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 the partial area between the sealing insulating assembly 2 and the main body 31 from being in contact and short-circuited, and the tubular portion 42 can also prevent the annular portion 41 from being deflected to a certain extent, so as to ensure that the annular portion 41 is attached to the bottom plate 32, and prevent a gap between the two, so that the axial length of the pole 3 inside the battery exceeds the design value, resulting in insufficient height of the riveted portion 33 of the pole 3.

[0046] like Figure 3 As shown, optionally, the thickness a of the high temperature resistant insulating ring 4 satisfies 0.3mm≤a≤0.5mm, that is, the thickness of the annular portion 41 and the thickness of the tubular portion 42 both meet the above value range. If the thickness of the high temperature resistant insulating ring 4 is too small, it is easy to crack and fail, and the 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, affecting the sealing performance.

[0047] 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 15 mm ≤ b ≤ 23 mm. Preferably, the outer ring diameter b of the high temperature resistant insulating ring 4 is 19 mm to match the size of the bottom plate 32 of the pole 3. Of course, in other embodiments, the outer ring diameter of the high temperature resistant insulating ring 4 can be adjusted according to the size of the pole 3.

[0048] Optionally, 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. 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 is too small to ensure that the entire area between the bottom plates 32 is covered.

[0049] Optionally, the height d of the high temperature resistant insulating ring 4 along the axial direction of the pole 3 satisfies d≥0.85 mm. If the height d of the high temperature resistant insulating ring 4 along the axial direction of the pole 3 is too small, the tubular portion 42 will not exist.

[0050] Optionally, the high temperature resistant insulating ring 4 is a ring-shaped structure of ceramic material. The ceramic material can ensure the high temperature resistance and insulation performance of the high temperature resistant insulating ring 4, and ensure that the high temperature resistant insulating ring 4 will not melt when the pole 3 heats up rapidly during fast charging, and still has stable insulation performance at high temperature.

[0051] Optionally, in this embodiment, the material of the high temperature resistant insulating ring 4 is a mixture of ceramic and polypropylene. The insulating ring made of pure ceramic material is not elastic and has poor sealing performance. And after testing, the plastic parts in the prior art can only guarantee stable insulation performance below 300°C. Once the temperature is higher than 300°C, the plastic parts will melt and fail to cause a short circuit. The high temperature resistant insulating ring 4 provided in this embodiment is a mixture of ceramic and polypropylene, which can take into account both sealing and high temperature resistant insulation.

[0052] Optionally, the ceramic used in this embodiment is A-95 alumina ceramic, which has good insulation properties under high temperature conditions.

[0053] Optionally, the mass ratio of ceramic to polypropylene is 9:1, that is, the high temperature resistant insulating ring 4 contains 90% ceramic and 10% polypropylene by mass. After testing, the high temperature resistant insulating ring 4 that meets the above ratio can maintain stable insulation performance under high temperature environment of 300°C, and can even remain unmelted for 60 seconds under high temperature conditions of 500°C, which can prevent short circuits between the pole 3 and the shell 1, and can significantly improve the safety performance of the battery. And the test results show that when the mass ratio of ceramic to polypropylene is lower than 9:1, that is, when the ceramic content is reduced and the polypropylene content is increased, the heat-resistant insulation effect of the obtained high temperature resistant insulating ring 4 will be reduced. This is because in a high temperature environment, the polypropylene part of the high temperature resistant insulating ring 4 will melt, the overall thickness of the remaining ceramic material will become thinner, and the insulation will be reduced.

[0054] Optionally, a limiting groove 311 is circumferentially provided 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 limiting groove 311 can limit the position of the high temperature resistant insulating ring 4 along the axial direction of the pole 3 to prevent the high temperature resistant insulating ring 4 from being misplaced and failing, or occupying too much space.

[0055] Optionally, in this embodiment, the pole 3 includes a riveted portion 33, and the riveted portion 33 is located outside the battery. Of course, in other embodiments, the pole 3 can also be fixed to the first through hole 111 of the housing 1 by providing a riveted block or encapsulating with rubber.

[0056] Optionally, the sealing insulation assembly 2 includes a first insulating member 21 , which is sandwiched between the end surface of the riveted portion 33 facing the inside of the battery and the end surface of the first end plate 11 facing the outside of the battery to ensure insulation between the riveted portion 33 and the first end plate 11 .

[0057] Optionally, the first insulating member 21 is a sheet structure of ceramic material. Similarly, the ceramic material can ensure the high temperature resistance and insulation performance of the first insulating member 21, ensuring that the first insulating member 21 will not melt when the pole 3 heats up rapidly during fast charging, and still has stable insulation performance at high temperatures.

[0058] Optionally, the sealing and insulating assembly 2 further includes a sealing ring 22, which is sleeved on the main body 31. In order to ensure the sealing performance of the sealing ring 22, the compression amount needs to be ensured at various locations of the sealing ring 22, the sealing ring 22 part is interference-fitted with the step surface on the side wall of the main body 31 facing the inside of the battery, the sealing ring 22 part is interference-clamped between the side wall of the main body 31 and the inner wall of the first through hole 111, and the sealing ring 22 part is interference-clamped between the end surface of the first end plate 11 facing the inside of the battery and the high temperature resistant insulating ring 4.

[0059] Optionally, in this embodiment, the cross section of the sealing ring 22 is an L-shaped structure.

[0060] Optionally, the sealing insulation assembly 2 further includes a second insulation member 23, which is attached to the side of the first end plate 11 facing the inside of the battery. Optionally, the second insulation member 23 has a third through hole, and the inner wall of the third through hole is circumferentially butted with the outer ring of the sealing ring 22 to form a first layer of insulation protection between the bottom plate 32 and the first end plate 11.

[0061] Optionally, the outer shell 1 is composed of a top cover and a shell, the top cover is arranged at the opening of the shell, and the top cover is sealed and connected to the shell to form the outer shell 1 of the battery. Optionally, the first end plate 11 can be the top cover, and the first end plate 11 can also be an end surface on the shell. In this embodiment, the first end plate 11 is an end surface on the shell, the first end plate 11 is connected to the negative electrode, the pole 3 here is the positive pole, and the pole 3 and the first end plate 11 need to ensure stable insulation.

[0062] This embodiment also provides a battery, including a battery cell and the above-mentioned battery structure assembly, wherein the battery cell is located in a housing 1. Optionally, in this embodiment, the battery is a cylindrical battery, and of course in other embodiments, the battery may also be a square battery. The battery can prevent insulation failure and short circuit.

[0063] This embodiment also provides a manufacturing method for manufacturing the above-mentioned battery structure components, and the manufacturing method includes: using a stirring device to evenly mix ceramic powder and polypropylene particles according to a mass ratio of 9:1 between ceramic and polypropylene, and then using an injection molding machine to injection mold the mixed material to form a high-temperature resistant insulating ring 4.

[0064] Optionally, the mold temperature needs to be greater than or equal to 230° C., and the injection temperature of the injection molding machine needs to be greater than or equal to 410° C. to ensure that the polypropylene is fully melted and the materials are evenly mixed in all parts of the high-temperature resistant insulating ring 4 .

[0065] Optionally, the high temperature resistant insulating ring 4 may be directly formed by injection molding on the pole 3 to ensure that the high temperature resistant insulating ring 4 can be located in the limiting groove 311 of the pole 3 .

[0066] The manufacturing method also includes the assembly process of each component, and optionally, also includes assembling the sealing ring 22 on the pole 3 to form a pole assembly including the pole 3, the sealing ring 22 and the high temperature resistant insulating ring 4. At the same time, the second insulating member 23 is attached to the end face of the first end plate 11 facing the inside of the battery, and then the pole assembly is placed at the first through hole 111 of the outer shell 1, and then the first insulating member 21 is put on the part of the pole 3 extending out of the outer shell 1. Finally, the end of the pole 3 is riveted on the outer end face of the first end plate 11 to form a riveted portion 33 to ensure that the pole 3 is firmly connected to the first end plate 11, and at the same time, the sealing insulating assembly 2 and the high temperature resistant insulating ring 4 are pressed.

[0067] The battery structure assembly manufactured using the manufacturing method can prevent insulation failure and short circuit.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery structure assembly, characterized in that: include: A housing (1), wherein a first through hole (111) is formed on a first end plate (11) of the housing (1); A sealed insulating component (2), wherein a portion of the sealed insulating component (2) located within the first through hole (111) surrounds a second through hole; The pole (3) comprises a main body (31) and a bottom plate (32), wherein the main body (31) is inserted into the second through hole, the bottom plate (32) is located inside the battery, and the sealing insulation component (2) is partially sandwiched between the bottom plate (32) and the first end plate (11); A high temperature resistant insulating ring (4), wherein the high temperature resistant insulating ring (4) is sleeved on the pole (3), and a portion of the high temperature resistant insulating ring (4) is sandwiched between the sealed insulating component (2) and the bottom plate (32).

2. The battery structure assembly according to claim 1, characterized in that: 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); And / or, the vertical distance between the inner ring of the high temperature resistant insulating ring (4) and the axial direction of the pole (3) is smaller than the vertical distance between the inner wall of the second through hole and the axial direction of the pole (3).

3. The battery structure assembly according to claim 1, characterized in that: The high temperature resistant insulating ring (4) comprises an annular portion (41) and a tubular portion (42) which are connected to each other, wherein the annular portion (41) is sandwiched between the sealing insulating assembly (2) and the bottom plate (32), and the tubular portion (42) is sandwiched between the inner wall of the second through hole and the side wall of the main body (31).

4. The battery structure assembly according to claim 1, characterized in that: The thickness a of the high temperature resistant insulating ring (4) satisfies 0.3 mm ≤ a ≤ 0.5 mm; And / or, 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 15 mm ≤ b ≤ 23 mm; And / or, 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; And / or, the height d of the high temperature resistant insulating ring (4) along the axial direction of the pole (3) satisfies: d≥0.85 mm.

5. The battery structure assembly according to claim 1, characterized in that: The material of the high temperature resistant insulating ring (4) is a mixture of ceramic and polypropylene, and the mass ratio of ceramic to polypropylene is 9:

1.

6. The battery structure assembly according to any one of claims 1 to 5, characterized in that: A limiting groove (311) is circumferentially provided 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).

7. The battery structure assembly according to any one of claims 1 to 5, characterized in that: The pole (3) comprises a riveted portion (33), wherein the riveted portion (33) is located outside the battery; the sealed insulating assembly (2) comprises a first insulating member (21), wherein the first insulating member (21) is sandwiched between an end surface of the riveted portion (33) facing the interior of the battery and an end surface of the first end plate (11) facing the exterior of the battery; and the first insulating member (21) is a sheet-like structure of a ceramic material.

8. The battery structure assembly according to any one of claims 1 to 5, characterized in that: The sealing insulating assembly (2) further comprises a sealing ring (22), wherein the sealing ring (22) is sleeved on the main body (31), wherein a portion of the sealing ring (22) is interference-fitted with a step surface on a side wall of the main body (31) facing the interior of the battery, wherein a portion of the sealing ring (22) is interference-clamped between the side wall of the main body (31) and the inner wall of the first through hole (111), and a portion of the sealing ring (22) is interference-clamped between an end surface of the first end plate (11) facing the interior of the battery and the high temperature resistant insulating ring (4).

9. A battery, characterized in that It comprises a battery cell and a battery structure assembly as claimed in any one of claims 1 to 8, wherein the battery cell is located in the housing (1).

10. A manufacturing method, characterized in that: Applied to manufacturing the battery structure assembly according to any one of claims 1 to 8, the manufacturing method comprises: The ceramic powder and the polypropylene particles are mixed evenly by using a stirring device, and then the mixed material is injection molded by using an injection molding machine to form the high temperature resistant insulating ring (4).

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