Explosion-proof valve assembly structure and battery cell

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses an explosion-proof valve assembly structure and a battery cell, the explosion-proof valve assembly structure comprises a sealing ring, an explosion-proof valve and a compression ring, a first sinking table is arranged on the end face of a shell in the circumferential direction of a blast hole, and a mounting groove for accommodating the sealing ring is formed in the bottom wall of the first sinking table; the anti-explosion valve is embedded in the first sinking table and enables the sealing ring to be tightly pressed on the groove wall of the installation groove. The pressing ring is connected to the shell in a welded mode, and the anti-explosion valve is pressed on the first sinking table through the pressing ring. Therefore, the explosion-proof valve is fixedly mounted on the top cover plate. In the assembly structure, the explosion-proof valve made of aluminum and the shell made of stainless steel are assembled well, and sealing is reliable. And the explosion-proof valve made of the aluminum material has the advantages of light weight, high nick residual thickness, low bursting pressure value and low annealing cost. The pressing ring and the shell are made of the same material, and the welding quality between the pressing ring and the shell is good. The utility model further provides a battery cell which comprises the explosion-proof valve assembly structure.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an explosion-proof valve assembly structure and a battery cell. Background Technology

[0002] With the popularization of new energy vehicles and the rapid development of power batteries, stainless steel casings are now commonly used to improve the safety performance of battery cells. Stainless steel casings better protect the cells from external damage and provide stronger physical protection. Generally, the explosion-proof valves installed on these casings are also made of stainless steel. However, stainless steel explosion-proof valves have high burst pressure values, poor stability, require stringent annealing conditions, and have low residual thickness of the scoring marks, making them prone to cracking during manufacturing. Furthermore, their production cost is high. Utility Model Content

[0003] The purpose of this utility model is to provide an explosion-proof valve assembly structure and battery cell, which uses an aluminum explosion-proof valve and a stainless steel shell for assembly. The two are well assembled and reliably sealed. At the same time, the aluminum explosion-proof valve has the advantages of light weight, high residual thickness of the groove, low burst pressure value and low annealing cost.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] On the one hand, this utility model provides an explosion-proof valve assembly structure, the explosion-proof valve assembly structure comprising:

[0006] The outer casing has a burst hole, and a first recessed platform is provided on the end face of the outer casing located around the burst hole. The bottom wall of the first recessed platform has a mounting groove.

[0007] The sealing ring is partially disposed within the mounting groove;

[0008] An explosion-proof valve is embedded in the first recessed platform. The end face of the explosion-proof valve facing the outer shell is in contact with the bottom wall of the first recessed platform to press the sealing ring against the groove wall of the mounting groove. The explosion-proof valve is made of aluminum.

[0009] The pressure ring is made of the same material as the outer shell and is welded to the side of the outer shell where the first recess is located. The pressure ring presses the explosion-proof valve against the first recess.

[0010] Optionally, the explosion-proof valve includes a fixing part and a body part. The fixing part is disposed in the circumference of the body part and is embedded in the first recessed platform. The end face of the fixing part facing the outer shell is fitted with the first bottom wall of the first recessed platform to press the sealing ring against the groove wall of the mounting groove. The circumferential side wall of the fixing part is fitted with or spaced from the first side wall of the first recessed platform.

[0011] Optionally, the body portion is provided with a groove along the axial direction of the blast hole, and the projection of the groove on the outer casing is located inside the blast hole.

[0012] Optionally, along the axial direction of the rupture hole, the projection of the fixing part on the housing covers the mounting groove, and the projection of the pressure ring on the housing at least partially coincides with the projection of the fixing part on the housing.

[0013] Optionally, a second recessed platform is provided on the end face of the outer casing located circumferentially to the blast hole. The second recessed platform is located circumferentially to the first recessed platform, and the pressure ring is embedded in the second recessed platform.

[0014] Optionally, the end face of the pressure ring facing the outer shell is fitted with the second bottom wall of the second sinking platform, and the circumferential sidewall of the pressure ring is welded to the second sidewall of the second sinking platform.

[0015] Optionally, the sealing ring has a circular cross-section, and the mounting groove has a semi-circular, triangular, square, or trapezoidal cross-section.

[0016] Optionally, the explosion-proof valve assembly structure further includes an explosion-proof valve protective patch, wherein the end face of the housing opposite to the first recessed platform has a protrusion, the protrusion is located circumferentially to the rupture hole, and the explosion-proof valve protective patch is connected to the protrusion.

[0017] Optionally, the housing includes a top cover and a housing, with an opening on at least one side of the housing, the top cover being connected to the opening, and the burst hole being disposed on the top cover.

[0018] On the other hand, this utility model provides a battery cell that includes the explosion-proof valve assembly structure of any of the above-mentioned solutions.

[0019] The beneficial effects of this utility model are as follows:

[0020] This utility model provides an explosion-proof valve assembly structure, which is located at the rupture hole of the outer shell and is used to seal the rupture hole on the outer shell. The explosion-proof valve assembly structure includes a sealing ring, an explosion-proof valve, and a pressure ring. A first recessed platform is provided on the end face of the outer shell circumferentially to the rupture hole. The bottom wall of the first recessed platform has a mounting groove for accommodating the sealing ring. The explosion-proof valve is embedded in the first recessed platform, and the explosion-proof valve presses the sealing ring tightly against the groove wall. The pressure ring is welded to the side of the outer shell where the first recessed platform is located, and the pressure ring presses the explosion-proof valve tightly against the first recessed platform. Thus, the explosion-proof valve is fixedly installed on the top cover plate. In the above assembly structure, the aluminum explosion-proof valve is assembled with the stainless steel outer shell, and the two are well assembled and reliably sealed. The explosion-proof valve is made of aluminum, which has the advantages of light weight, high residual thickness of the score line, low burst pressure value, and low annealing cost. Furthermore, the pressure ring is made of the same material as the outer shell, thereby ensuring good welding quality and high connection strength between the pressure ring and the outer shell.

[0021] This utility model also provides a battery cell, including a shell, an electrode assembly, and the explosion-proof valve assembly structure described above. The electrode assembly is disposed inside the shell, and the explosion-proof valve assembly structure is disposed on the top cover plate of the shell. The first recessed platform and the second recessed platform are located on the side closer to the electrode assembly. The explosion-proof valve is made of aluminum, replacing the stainless steel explosion-proof valve, which can reduce weight. At the same time, the aluminum explosion-proof valve also has the advantages of high score residual thickness, low burst pressure value, and low annealing cost. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0023] Figure 1 This is an exploded view of the explosion-proof valve assembly structure provided in Embodiment 1 of this utility model;

[0024] Figure 2 This is a top view of the explosion-proof valve assembly structure provided in Embodiment 1 of this utility model;

[0025] Figure 3 yes Figure 2 Cross-sectional view of section AA;

[0026] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle.

[0027] In the picture:

[0028] 100. Top cover plate; 110. Bursting hole; 120. First recessed platform; 121. Mounting groove; 130. Second recessed platform; 140. Protrusion; 200. Sealing ring; 300. Explosion-proof valve; 310. Fixing part; 320. Body part; 321. Score; 400. Pressure ring. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] 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.

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0036] Example 1

[0037] like Figures 1-4 As shown, this embodiment provides an explosion-proof valve assembly structure, which is disposed at the rupture hole 110 on the outer shell and is used to cover the rupture hole 110 on the outer shell.

[0038] The outer casing includes a top cover plate 100 and a housing. At least one side of the housing has an opening, and the top cover plate 100 is connected to the opening. A rupture hole 110 is provided on the top cover plate 100. The explosion-proof valve assembly structure includes a sealing ring 200, an explosion-proof valve 300, and a pressure ring 400. A first recess 120 is provided on the end face of the housing circumferential to the rupture hole 110. A mounting groove 121 is provided on the bottom wall of the first recess 120. The sealing ring 200 is partially disposed within the mounting groove 121. The explosion-proof valve 300 is embedded within the first recess 120. The end face of the explosion-proof valve 300 facing the housing is in contact with the bottom wall of the first recess 120, thereby compressing the sealing ring 200 and pressing it tightly against the groove wall of the mounting groove 121. The pressure ring 400 is welded to the side of the housing where the first recess 120 is located, pressing the explosion-proof valve 300 tightly against the first recess 120. This achieves the fixed installation of the explosion-proof valve 300 on the top cover plate 100. Furthermore, in the above assembly structure, the sealing ring 200 seals the gap between the explosion-proof valve 300 and the top cover plate 100, ensuring good sealing of the outer shell. The explosion-proof valve 300 is made of aluminum, which offers advantages such as light weight, high residual thickness of the 321 notch, low burst pressure, and low annealing cost.

[0039] Furthermore, the pressure ring 400 and the top cover plate 100 are made of the same material, thereby ensuring good welding quality and high connection strength between the pressure ring 400 and the top cover plate 100. For example, the pressure ring 400 and the top cover plate 100 can be made of stainless steel to ensure high structural strength of the housing and provide good protection for the electrode assembly. The aluminum explosion-proof valve 300 is assembled with the stainless steel housing, and the two are well assembled and reliably sealed. Of course, in other embodiments, the pressure ring 400 and the top cover plate 100 can also be made of aluminum. In the above assembly structure, the explosion-proof valve 300 does not need to be fixed to the top cover plate 100 by welding. The welding position of the pressure ring 400 and the top cover plate 100 is far from the explosion-proof valve 300, which helps to ensure the stability of the opening pressure of the explosion-proof valve 300 and avoids the explosion-proof valve 300 being affected by the heat generated during welding.

[0040] See also Figure 4 The explosion-proof valve 300 includes a fixing part 310 and a body part 320. The fixing part 310 is disposed circumferentially in the body part 320 and is embedded in the first recessed platform 120. The end face of the fixing part 310 facing the outer shell is abutted against the first bottom wall of the first recessed platform 120 to press the sealing ring 200 against the groove wall of the mounting groove 121. The circumferential side wall of the fixing part 310 is either abutted against or spaced apart from the first side wall of the first recessed platform 120. The arrangement of the first recessed platform 120 allows the explosion-proof valve 300 to be recessed within the rupture hole 110, preventing the explosion-proof valve 300 from being bumped or knocked, thus protecting the explosion-proof valve 300 and ensuring accurate and stable valve opening pressure. Along the axial direction of the rupture hole 110, the projection of the fixing part 310 on the housing covers the mounting groove 121, thereby sealing the explosion-proof valve 300 with the first side wall of the first recess 120 by the sealing ring 200, and ensuring high reliability. The projection of the pressure ring 400 on the housing at least partially coincides with the projection of the fixing part 310 on the housing, thereby ensuring that the pressure ring 400 can press and fix the explosion-proof valve 300 onto the top cover plate 100.

[0041] The main body 320 has a notch 321, which is C-shaped or annular. Along the axial direction of the blast hole 110 (i.e.... Figure 1 As shown in the Z-axis direction, the projection of the notch 321 on the outer casing is located within the rupture hole 110. Thus, when the pressure inside the outer casing is too high, exceeding the opening pressure of the explosion-proof valve 300, the notch 321 can be ruptured by high-temperature and high-pressure gas, and the part of the main body 320 located inside the notch 321 is lifted open, forming an exhaust channel there, thereby realizing the pressure relief function of the explosion-proof valve 300.

[0042] Furthermore, a second recessed platform 130 is provided on the end face of the outer casing circumferentially to the blast hole 110. The second recessed platform 130 is located circumferentially to the first recessed platform 120, and the pressure ring 400 is embedded in the second recessed platform 130. The end face of the pressure ring 400 facing the outer casing is in contact with the bottom wall of the second platform of the second recessed platform 130, and the circumferential sidewall of the pressure ring 400 is welded to the sidewall of the second platform of the second recessed platform 130. The setting of the second recessed platform 130 allows the pressure ring 400 to be recessed into the blast hole 110, avoiding impact to the pressure ring 400, and facilitating the protection of the welded joint between the pressure ring 400 and the top cover plate 100, ensuring that the explosion-proof valve 300 is stably and firmly fixed on the top cover plate 100.

[0043] Optionally, the sealing ring 200 has a circular cross-section, and the mounting groove 121 has a semi-circular cross-section. When the sealing ring 200 abuts against the fixing part 310 of the explosion-proof valve 300, the sealing ring 200 is compressed and deformed. For example, the compression rate of the sealing ring 200 is between 10% and 30%, so that the sealing ring 200 is filled into the mounting groove 121, ensuring that the seal between the explosion-proof valve 300 and the top cover plate 100 is intact, and that the stress between the explosion-proof valve 300 and the top cover plate 100 is not too large.

[0044] Of course, in other embodiments, the cross-sectional shape of the mounting groove 121 can also be triangular, square or trapezoidal, etc., and the cross-sectional shape of the sealing ring 200 is circular.

[0045] The explosion-proof valve assembly structure also includes an explosion-proof valve protective patch (not shown in the figure). The end face of the outer casing opposite to the first recess 120 has a protrusion 140, which is annular and surrounds the circumference of the rupture hole 110. The explosion-proof valve protective patch is connected to the protrusion 140. Optionally, the explosion-proof valve protective patch can be adhered to the protrusion 140 with adhesive. The explosion-proof valve protective patch protects the explosion-proof valve 300, preventing electrolyte from flowing to the explosion-proof valve 300 during cell filling and damaging it, thus preventing unstable valve opening pressure. The explosion-proof valve protective patch and / or the protrusion 140 are provided with vents that connect the rupture hole 110 to the space of the top cover 100 away from the explosion-proof valve 300, thereby ensuring accurate detection results during helium detection of the outer casing and avoiding misjudgments.

[0046] This embodiment also provides a battery cell, including a housing, an electrode assembly, and the explosion-proof valve assembly structure described above. The electrode assembly is disposed inside the housing, and the explosion-proof valve assembly structure is disposed on the top cover plate 100 of the housing. The first recessed platform 120 and the second recessed platform 130 are located on the side closer to the electrode assembly. In this embodiment, the explosion-proof valve 300 is made of aluminum, replacing the stainless steel explosion-proof valve 300, which can reduce weight. At the same time, the aluminum explosion-proof valve 300 also has the advantages of high residual thickness of the 321 notch, low burst pressure value, and low annealing cost.

[0047] Example 2

[0048] This embodiment also provides a battery cell, which differs from the battery cell in Embodiment 1 in that: the explosion-proof valve assembly structure in this embodiment is disposed on the housing, one side wall of the housing has a burst hole 110, and the pressure ring 400 is made of the same material as the housing, thereby ensuring good welding quality and high connection strength between the pressure ring 400 and the housing. For example, the pressure ring 400 and the housing can be made of stainless steel to ensure high structural strength of the housing and provide good protection for the electrode assembly. The aluminum explosion-proof valve 300 is assembled with the stainless steel housing, and the assembly is good and the seal is reliable.

[0049] The remaining structures in this embodiment are the same as those in Embodiment 1, and will not be described again here.

[0050] Obviously, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0051] Note that in the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. An explosion-proof valve assembly structure, characterized in that, The explosion-proof valve assembly structure includes: The outer casing is provided with a burst hole (110), and a first recessed platform (120) is provided on the end face of the outer casing located around the burst hole (110). The bottom wall of the first recessed platform (120) is provided with a mounting groove (121). A sealing ring (200) is partially disposed within the mounting groove (121); An explosion-proof valve (300) is embedded in the first recessed platform (120). The end face of the explosion-proof valve (300) facing the outer shell is in contact with the bottom wall of the first recessed platform (120) to press the sealing ring (200) against the groove wall of the mounting groove (121). The explosion-proof valve (300) is made of aluminum. A pressure ring (400) is made of the same material as the outer shell. The pressure ring (400) is welded to the side of the outer shell where the first recess (120) is located. The pressure ring (400) presses the explosion-proof valve (300) against the first recess (120).

2. The explosion-proof valve assembly structure according to claim 1, characterized in that, The explosion-proof valve (300) includes a fixing part (310) and a body part (320). The fixing part (310) is disposed in the circumference of the body part (320). The fixing part (310) is embedded in the first recessed platform (120). The end face of the fixing part (310) facing the outer shell is fitted with the first bottom wall of the first recessed platform (120) to press the sealing ring (200) against the groove wall of the mounting groove (121). The circumferential side wall of the fixing part (310) is fitted with or spaced from the first side wall of the first recessed platform (120).

3. The explosion-proof valve assembly structure according to claim 2, characterized in that, The body part (320) is provided with a groove (321) along the axial direction of the blast hole (110), and the projection of the groove (321) on the outer shell is located inside the blast hole (110).

4. The explosion-proof valve assembly structure according to claim 2, characterized in that, Along the axial direction of the burst hole (110), the projection of the fixing part (310) on the housing covers the mounting groove (121), and the projection of the pressure ring (400) on the housing at least partially coincides with the projection of the fixing part (310) on the housing.

5. The explosion-proof valve assembly structure according to claim 1, characterized in that, A second recessed platform (130) is provided on the end face of the outer shell located circumferentially to the blast hole (110). The second recessed platform (130) is located circumferentially to the first recessed platform (120), and the pressure ring (400) is embedded in the second recessed platform (130).

6. The explosion-proof valve assembly structure according to claim 5, characterized in that, The end face of the pressure ring (400) facing the outer shell is fitted with the second bottom wall of the second sinker (130), and the circumferential side wall of the pressure ring (400) is welded to the second side wall of the second sinker (130).

7. The explosion-proof valve assembly structure according to claim 1, characterized in that, The sealing ring (200) has a circular cross-section, and the mounting groove (121) has a semi-circular, triangular, square, or trapezoidal cross-section.

8. The explosion-proof valve assembly structure according to claim 1, characterized in that, The explosion-proof valve assembly structure also includes an explosion-proof valve protective patch. The end face of the outer shell opposite to the first recess (120) has a protrusion (140). The protrusion (140) is located in the circumference of the blast hole (110). The explosion-proof valve protective patch is connected to the protrusion (140).

9. The explosion-proof valve assembly structure according to claim 1, characterized in that, The outer casing includes a top cover plate (100) and a housing, with an opening on at least one side of the housing, the top cover plate (100) being connected to the opening, and the burst hole (110) being disposed on the top cover plate (100).

10. A battery cell, characterized in that, The explosion-proof valve assembly structure includes any one of claims 1-9.

Images