Pole assembly, top cover and secondary battery

Abstract

The utility model provides a pole assembly, a top cover and a secondary battery. The pole assembly comprises a pole, and the pole is arranged on the top surface of the battery cell; the positioning block is provided with a receding hole, the pole penetrates through the receding hole in the axial direction of the first receding hole, and the pole is welded to one end of the hole wall of the first receding hole to form a welding mark; the sealing element is arranged on the pole in a sleeving manner, and at least part of the sealing element is accommodated in the first avoiding hole; a containing space used for containing seam welding detection gas is formed between the pole and the positioning block and located between the welding mark and the sealing piece, and the containing space, the welding mark and the sealing piece are arranged at intervals in the axial direction of the first receding hole. According to the utility model, the problem that the seam welding effect of the pole cannot be effectively detected in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a pole assembly, a top cover and a secondary battery. Background Art

[0002] In the production process of new energy batteries, a variety of process methods are used, including seam welding, which is related to the safety performance and service life of the battery. The structure of the pole seam welding is usually equipped with a sealing ring at the root of the pole (that is, the end of the pole close to the internal winding core of the battery) to ensure that the inside of the battery is isolated from the external environment and prevent moisture and impurities from entering. The sealing ring will have a certain amount of compression after assembly to ensure its sealing performance. However, during the conventional helium inspection process, due to the barrier effect of the sealing ring, helium cannot smoothly enter the battery, resulting in the inability to effectively detect the welding effect of the pole seam welding. This brings potential risks to the quality and safety of the battery. If the welding effect cannot be effectively detected, the quality and safety of the battery cannot be ensured.

[0003] As can be seen from the above, the prior art has the problem of being unable to effectively detect the effect of the pole seam welding. Utility Model Content

[0004] The main purpose of the utility model is to provide a pole assembly, a top cover and a secondary battery, so as to solve the problem that the pole seam welding effect cannot be effectively detected in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a pole assembly is provided, including: a pole, which is arranged on the top surface of the battery cell; a positioning block, which is provided with a first avoidance hole, and the pole is penetrated through the first avoidance hole along the axial direction of the first avoidance hole, and the pole is welded to one end of the hole wall of the first avoidance hole to form a weld mark; a sealing member, which is sleeved on the pole and at least partially accommodated in the first avoidance hole; a accommodating space for accommodating seam welding detection gas is provided between the pole and the positioning block, the accommodating space is located between the weld mark and the sealing member, and the accommodating space, the weld mark and the sealing member are arranged at intervals along the axial direction of the first avoidance hole.

[0006] Furthermore, the accommodating space is an accommodating groove, and the outer peripheral wall of the pole is concave inwardly toward the center of the pole to form the accommodating groove.

[0007] Furthermore, the accommodating space is an accommodating groove, and the hole wall of the first avoidance hole is concave inwardly in a direction away from the pole to form the accommodating groove.

[0008] Furthermore, the accommodation space is an accommodation groove, the outer peripheral wall of the pole is concave toward the center of the pole, and the hole wall of the first avoidance hole is concave in the direction away from the pole, so as to jointly form the accommodation groove.

[0009] Further, the accommodating space includes at least one accommodating groove. When there are multiple accommodating grooves, the multiple accommodating grooves are arranged at intervals along the axial direction of the pole; and / or the multiple accommodating grooves are arranged at intervals along the circumferential direction of the pole.

[0010] Further, the first avoidance hole includes a first through hole, a second through hole and a third through hole which are sequentially connected along the axial direction, the weld mark is accommodated in the first through hole, and the sealing member is accommodated in the third through hole.

[0011] Furthermore, the pole includes a first cylinder and a second cylinder, the first cylinder and the second cylinder are coaxially arranged, the diameter of the first cylinder is smaller than the diameter of the second cylinder, the aperture of the first through hole is larger than the aperture of the second through hole, one end of the second cylinder connected to the first cylinder is welded to the hole wall of the second through hole, and a sealing member is sleeved on one end of the second cylinder away from the first cylinder.

[0012] Furthermore, the diameter of the second column matches the diameter of the second through hole, and the aperture of the second through hole is smaller than the aperture of the third through hole.

[0013] According to another aspect of the utility model, a top cover is provided, comprising the above-mentioned pole assembly.

[0014] According to another aspect of the utility model, a secondary battery is provided, comprising the above-mentioned top cover.

[0015] The technical solution of the utility model is applied, and the pole assembly includes a pole, a positioning block and a sealing member, the pole is arranged on the top surface of the battery core, the positioning block is provided with a first avoidance hole, the pole is penetrated in the first avoidance hole along the axial direction of the first avoidance hole, the pole is welded to one end of the hole wall of the first avoidance hole to form a welding mark, the sealing member is sleeved on the pole and at least partially accommodated in the first avoidance hole, and a accommodating space for accommodating seam welding detection gas is provided between the pole and the positioning block, the accommodating space is located between the welding mark and the sealing member, and the accommodating space, the welding mark and the sealing member are arranged along the axial direction of the first avoidance hole. The interval setting is achieved by opening a accommodating space between the pole and the positioning block. After the welding of the pole and the positioning block is completed, the seam welding detection gas is injected into the position of the weld mark. When the welding effect is poor, that is, the weld mark is incomplete, the seam welding detection gas will enter the accommodating space, and the seam welding detection device is used to detect whether there is residual seam welding detection gas in the accommodating space. If there is residual seam welding detection gas, it proves that the welding effect is poor, otherwise the welding effect is good, thereby realizing effective detection of the pole seam welding effect, and solving the problem that the pole seam welding effect cannot be effectively detected in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic diagram showing the structure of a pole assembly in a specific embodiment of the utility model is shown; and

[0018] Figure 2 A schematic diagram showing the structure of a pole in a specific embodiment of the utility model is shown;

[0019] Figure 3 A schematic diagram showing the structure of a positioning block in a specific embodiment of the utility model is shown;

[0020] Figure 4 A schematic structural diagram of a pole assembly in another specific embodiment of the utility model is shown;

[0021] Figure 5 A schematic diagram showing the structure of a pole in another specific embodiment of the utility model is shown;

[0022] Figure 6 A schematic structural diagram of a positioning block in another specific embodiment of the utility model is shown;

[0023] Figure 7 A schematic diagram showing gas injection of a secondary battery in a specific embodiment of the utility model is shown;

[0024] Figure 8 Shows Figure 7 The cross-section at A in the middle;

[0025] Fig. 9 A schematic diagram of secondary battery detection in a specific embodiment of the utility model is shown.

[0026] The above drawings include the following reference numerals:

[0027] 10. Pole; 11. First column; 12. Second column; 20. Positioning block; 21. First through hole; 22. Second through hole; 23. Third through hole; 30. Welding stamp; 40. Sealing member; 50. Accommodating space; 60. Gas injection device; 70. Secondary battery; 80. Detection device. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0030] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0031] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0032] In order to solve the problem in the prior art that the effect of pole seam welding cannot be effectively detected, the utility model provides a pole assembly, a top cover and a secondary battery.

[0033] like Figures 1 to 8 As shown, the pole assembly includes a pole 10, a positioning block 20 and a seal 40. The pole 10 is arranged on the top surface of the battery cell. The positioning block 20 is provided with a first avoidance hole, and the pole 10 is penetrated in the first avoidance hole along the axial direction of the first avoidance hole. The pole 10 is welded to one end of the hole wall of the first avoidance hole to form a weld mark 30. The seal 40 is sleeved on the pole 10 and at least partially accommodated in the first avoidance hole. There is an accommodating space 50 for accommodating seam welding detection gas between the pole 10 and the positioning block 20, and the accommodating space 50 is located between the weld mark 30 and the seal 40. The accommodating space 50, the weld mark 30 and the seal 40 are arranged at intervals along the axial direction of the first avoidance hole.

[0034] By opening a receiving space 50 between the pole 10 and the positioning block 20, after the welding of the pole 10 and the positioning block 20 is completed, a seam welding detection gas is injected into the position of the weld mark 30. When the welding effect is poor, that is, the weld mark is incomplete, the seam welding detection gas will enter the receiving space 50, and a seam welding detection device is used to detect whether there is residual seam welding detection gas in the receiving space 50. If there is residual seam welding detection gas, it proves that the welding effect is poor, otherwise the welding effect is good, thereby realizing effective detection of the seam welding effect of the pole 10.

[0035] In this embodiment, if Figure 1 to Figure 2 As shown, the accommodation space 50 is an accommodation groove, and the outer peripheral wall of the pole 10 is concave inward toward the center of the pole 10 to form the accommodation groove.

[0036] Specifically, the receiving groove is provided on the outer peripheral wall of the pole 10, and the receiving groove surrounds the pole 10 in a horizontal plane, and the receiving groove has a certain depth, and can accommodate a certain amount of detection gas without affecting the structural strength of the pole 10. Optionally, the receiving groove is spirally arranged along the axial direction of the pole 10 to facilitate the entry of the detection gas, and the specific selection can be made according to actual needs.

[0037] In another embodiment of the present application, Figure 4 and Figure 6 As shown, the accommodation space 50 is an accommodation groove, and the hole wall of the first avoidance hole is concave inwardly in a direction away from the pole 10 to form the accommodation groove.

[0038] Specifically, the accommodating space 50 is arranged along the inner wall of the first avoidance hole of the positioning block 20. In this embodiment, the accommodating groove is arranged around the first avoidance hole on a horizontal plane to form an annular groove structure. Similarly, it can also be spirally arranged on the hole wall of the first avoidance hole. Optionally, the accommodating groove is an annular groove section, and it is only necessary to satisfy that the accommodating space 50 can accommodate part of the detection gas.

[0039] In an embodiment not shown in the figure of the present application, the accommodating space 50 is an accommodating groove, the outer peripheral wall of the pole 10 is concave inward toward the center of the pole 10, and the hole wall of the first avoidance hole is concave inward away from the pole 10, so as to jointly form the accommodating groove.

[0040] Specifically, the pole 10 and the positioning block 20 are both provided with a partial accommodation space 50, and this arrangement can prevent the structural strength of the pole 10 and the positioning block 20 from being greatly weakened. Optionally, the vertical height of the accommodation space 50 on the pole 10 is greater than the height of the accommodation space 50 on the positioning block 20, or the vertical height of the accommodation space 50 on the pole 10 is less than the height of the accommodation space 50 on the positioning block 20, that is, the two accommodation spaces 50 are staggered. Of course, the two accommodation spaces 50 can also be located on the same horizontal plane, thereby forming a larger accommodation area to better accommodate the detection gas.

[0041] In this embodiment, the accommodation space 50 includes at least one accommodation groove. When there are multiple accommodation grooves, the multiple accommodation grooves are arranged at intervals along the axial direction of the pole 10 and / or the multiple accommodation grooves are arranged at intervals along the circumferential direction of the pole 10 .

[0042] Specifically, when there are multiple accommodating grooves, the multiple accommodating grooves are arranged at intervals on the outer side wall of the pole 10. Optionally, the positioning block 20 is also provided with multiple accommodating grooves arranged at intervals, and the multiple accommodating grooves on the pole 10 and the multiple accommodating grooves on the positioning block 20 are arranged in a staggered manner or in a one-to-one correspondence. When the multiple accommodating grooves are arranged at intervals along the circumference of the pole 10, the accommodating grooves are groove segments, and optionally, the inner wall of the first avoidance hole is also correspondingly provided with multiple accommodating grooves.

[0043] like Figure 3 and Figure 6 As shown, the first avoidance hole includes a first through hole 21 , a second through hole 22 and a third through hole 23 which are sequentially connected along the axial direction. The welding stamp 30 is accommodated in the first through hole 21 , and the sealing member 40 is accommodated in the third through hole 23 .

[0044] Specifically, the diameter of the weld mark 30 is matched with the first through hole 21, and the first through hole 21 and the side wall of the pole 10 cooperate to form an annular groove, in which the weld mark 30 is accommodated. The third through hole 23 and the pole 10 also form an annular groove, and the sealing member 40 is matched with the annular groove, or is larger than the inner diameter of the annular groove, so that the sealing member 40 is squeezed to ensure sealing when the positioning block 20 is assembled.

[0045] like Figure 2 and Figure 5 As shown, the pole 10 includes a first cylinder 11 and a second cylinder 12, the first cylinder 11 and the second cylinder 12 are coaxially arranged, the diameter of the first cylinder 11 is smaller than the diameter of the second cylinder 12, the aperture of the first through hole 21 is larger than the aperture of the second through hole 22, the end of the second cylinder 12 connected to the first cylinder 11 is welded to the hole wall of the second through hole 22, and the sealing member 40 is sleeved on the end of the second cylinder 12 away from the first cylinder 11.

[0046] Specifically, the first column 11 and the second column 12 are integrally formed, and the first column 11 and the second column 12 form a stepped shaft. The top of the second column 12, the side wall of the first column 11 and the first through hole 21 form the annular groove for accommodating the welding mark 30, which can accommodate the welding mark 30 and the gas injection device and the detection device, so as to facilitate the subsequent detection of the welding effect.

[0047] In this embodiment, the seal 40 is a seal ring, which is sleeved on the second column 12, and the seal 40 is adapted to the diameter of the second column 12. The seal 40 is a rubber ring or a silicone ring, so that it can deform after being stressed to seal the second column 12.

[0048] In this embodiment, the diameter of the second column 12 matches the diameter of the second through hole 22 , and the aperture of the second through hole 22 is smaller than the aperture of the third through hole 23 .

[0049] Specifically, the weld mark 30 and the seal 40 seal the gap between the second column 12 and the second through hole 22 and the accommodation space 50. When the welding effect is poor and the weld mark 30 is incomplete, the detection gas enters the accommodation space 50 along the gap between the second column 12 and the second through hole 22. Even if part of the detection gas overflows the accommodation space 50, some of it will still remain. During the inspection, it is only necessary to detect whether there is any residual detection gas. At the same time, this method also facilitates the assembly between the positioning block 20 and the pole 10, which can speed up the assembly efficiency.

[0050] The utility model also provides a top cover, comprising the above-mentioned pole assembly.

[0051] Specifically, the top cover also includes a cover plate, which is provided with a second avoidance hole for avoiding the pole 10 and a positioning groove for accommodating the positioning block 20, and the positioning block 20 is adapted to the positioning groove. When assembling, the cover plate is sleeved on the pole 10 ( Figure 1 Only the upper structure of the pole 10 is shown, and the pole 10 also includes a lower structure located in the second avoidance hole of the cover plate. A sealing ring is arranged between the pole 10 and the cover plate, and a positioning block 20 is accommodated in the positioning groove. An upper plastic is arranged between the positioning block 20 and the cover plate. There are usually two positioning blocks 20, which are arranged on the cover plate at intervals, corresponding to the positive and negative pole assemblies respectively. The position connection relationship between the pole 10 and the positioning block 20 and the cover plate is a conventional design, which will not be described in detail here.

[0052] The utility model also provides a secondary battery, including the above-mentioned top cover. The secondary battery further includes a battery cell and a shell. The battery cell is accommodated in the shell. The top cover closes the opening of the shell. The positioning block 20 is located on the side of the top cover away from the battery cell. This is a conventional design and will not be described in detail here.

[0053] Specifically, Figure 7 As shown, after the secondary battery 70 is assembled and the pole 10 and the positioning block 20 are welded, the gas injection device 60 is used to inject the detection gas into the secondary battery 70. In this embodiment, the detection gas is high-pressure helium. The gas injection device 60 covers the entire pole assembly and then injects high-pressure helium downward. Figure 7 and Figure 8 As shown, when the weld mark 30 is incomplete, high-pressure helium will enter the accommodation space 50; after the high-pressure helium is injected, the pole assembly is inspected using the detection device 80, and before that, the secondary battery 70 can be evacuated with negative pressure to allow helium to enter the accommodation space 50 or the gap between the pole 10 and the first avoidance hole. If it is detected that there is residual detection gas in the accommodation space 50, it can be determined that the welding quality is poor and the product is unqualified.

[0054] Furthermore, in this embodiment, the helium injection pressure is about 0.05MPa-0.5Mpa, and the detection device 80 is a mass spectrometer, such as Figure 7 and Fig. 9As shown, the electrode assembly includes a positive electrode assembly and a negative electrode assembly, and the gas injection device 60 and the detection device 80 are used to simultaneously perform gas injection and gas extraction detection operations on the positive electrode assembly and the negative electrode assembly. This detection method can speed up the detection efficiency. As long as helium is detected, it is not necessary to determine whether it is a positive electrode assembly or a negative electrode assembly. The entire secondary battery 70 can be judged as an unqualified product. Optionally, after the secondary battery 70 is assembled, welded and gas-injected, the entire secondary battery 70 is placed in a large cavity of the detection device 80 for detection.

[0055] From the above description, it can be seen that the above-mentioned embodiment of the utility model achieves the following technical effects: by setting a pole assembly including a pole 10, a positioning block 20 and a seal 40, the pole 10 is arranged on the top surface of the battery cell, the positioning block 20 is provided with a first avoidance hole, the pole 10 is penetrated in the first avoidance hole along the axial direction of the first avoidance hole, the pole 10 is welded to one end of the hole wall of the first avoidance hole to form a weld mark 30, the seal 40 is sleeved on the pole 10 and at least partially accommodated in the first avoidance hole, and a accommodating space 50 for accommodating seam welding detection gas is provided between the pole 10 and the positioning block 20, and the accommodating space 50 is located between the weld mark 30 and Between the seal 40, the accommodating space 50, the weld mark 30 and the seal 40 are arranged at axial intervals along the first avoidance hole. By opening the accommodating space 50 between the pole 10 and the positioning block 20, after the welding of the pole 10 and the positioning block 20 is completed, the seam welding detection gas is injected into the position of the weld mark 30. When the welding effect is poor, that is, the weld mark is incomplete, the seam welding detection gas will enter the accommodating space 50, and the seam welding detection device is used to detect whether there is residual seam welding detection gas in the accommodating space 50. If there is residual seam welding detection gas, it proves that the welding effect is poor, otherwise the welding effect is good, thereby realizing effective detection of the seam welding effect of the pole 10.

[0056] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0058] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A pole assembly, characterized in that: include: A pole (10), wherein the pole (10) is arranged on the top surface of the battery cell; A positioning block (20), wherein the positioning block (20) is provided with a first avoidance hole, the pole (10) is inserted into the first avoidance hole along the axial direction of the first avoidance hole, and the pole (10) is welded to one end of the hole wall of the first avoidance hole to form a weld mark (30); A sealing member (40), the sealing member (40) being sleeved on the pole (10) and at least partially accommodated in the first avoidance hole; A containing space (50) for containing seam welding detection gas is provided between the pole (10) and the positioning block (20); the containing space (50) is located between the weld mark (30) and the sealing member (40); the containing space (50), the weld mark (30) and the sealing member (40) are arranged at intervals along the axial direction of the first avoidance hole.

2. The pole assembly according to claim 1, characterized in that: The accommodation space (50) is an accommodation groove, and the outer peripheral wall of the pole (10) is concave inwardly in a direction close to the center of the pole (10) to form the accommodation groove.

3. The pole assembly according to claim 1, characterized in that: The accommodation space (50) is an accommodation groove, and the hole wall of the first avoidance hole is concave inwardly in a direction away from the pole (10) to form the accommodation groove.

4. The pole assembly according to claim 1, characterized in that: The accommodation space (50) is an accommodation groove, the outer peripheral wall of the pole (10) is concave toward the center of the pole (10), and the hole wall of the first avoidance hole is concave in a direction away from the pole (10), so as to jointly form the accommodation groove.

5. The pole assembly according to claim 1, characterized in that: The accommodating space (50) comprises at least one accommodating groove. When there are multiple accommodating grooves, the multiple accommodating grooves are arranged at intervals along the axial direction of the pole (10); and / or the multiple accommodating grooves are arranged at intervals along the circumferential direction of the pole (10).

6. The pole assembly according to claim 1, characterized in that: The first avoidance hole comprises a first through hole (21), a second through hole (22) and a third through hole (23) which are sequentially connected along the axial direction; the weld mark (30) is accommodated in the first through hole (21); and the sealing member (40) is accommodated in the third through hole (23).

7. The pole assembly according to claim 6, characterized in that: The pole (10) comprises a first column (11) and a second column (12); the first column (11) and the second column (12) are coaxially arranged; the diameter of the first column (11) is smaller than the diameter of the second column (12); the aperture of the first through hole (21) is larger than the aperture of the second through hole (22); one end of the second column (12) connected to the first column (11) is welded to the hole wall of the second through hole (22); and the sealing member (40) is sleeved on one end of the second column (12) away from the first column (11).

8. The pole assembly according to claim 7, characterized in that: The diameter of the second column (12) matches the diameter of the second through hole (22), and the aperture of the second through hole (22) is smaller than the aperture of the third through hole (23).

9. A top cover, characterized in that: The invention comprises the pole assembly according to any one of claims 1 to 8.

10. A secondary battery, characterized in that: Comprising the top cover as claimed in claim 9.

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