Battery cell top cover and battery cell

Abstract

The utility model provides a battery cell top cover and battery cell, the battery cell top cover comprises a cover plate, a pole, a conductive structure and an adapter piece, the pole is arranged on the cover plate, the pole is provided with a pole hole, the conductive structure is arranged on the cover plate, the conductive structure is provided with a groove structure with a notch facing one side away from the pole, the pole hole is communicated with the groove structure, and the adapter piece is arranged on the cover plate. The switching piece is arranged on the conductive structure, the switching piece covers the notch of the groove structure, the switching piece and the conductive structure form an accommodating cavity, and the pole is electrically connected with the switching piece through the conductive structure. The battery cell top cover and the battery cell provided by the utility model can solve the problems of material damage and low detection success rate in the detection of the welding quality of the adapter plate in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of battery-related structures, and in particular to a battery cell top cover and a battery cell. Background Art

[0002] With the continuous expansion of the secondary battery application market, adapter welding is a key process in the production of secondary batteries. This process is to weld the adapter and the top cover together with a laser. The welding effect directly determines the performance and safety of the battery cell. At present, there are mainly the following ways to detect the welding quality of adapters in the industry:

[0003] The metallographic surface can be checked by cutting, but cutting the adapter and the top cover to check the metallographic depth and width not only requires the destruction of materials, but also may cause the broken welded battery cell to be unable to be identified due to the wrong cutting position, which poses a risk;

[0004] CCD image detection, but the success rate of CCD image detection technology for detecting false solder joints and broken solder joints of adapters is currently low;

[0005] Tensile testing with a tensile testing machine can better identify poorly soldered cells, but it will still damage the material and it is impossible to fully inspect the cells.

[0006] As can be seen from the above, the current detection of adapter welding quality has the problems of material damage and low detection success rate. Utility Model Content

[0007] The main purpose of the utility model is to provide a battery cell top cover and a battery cell, so as to solve the problems of material destruction and low detection success rate in the detection of welding quality of adapter sheets in the prior art.

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery cell top cover is provided, the battery cell top cover includes a cover plate; a pole, the pole is arranged on the cover plate, and the pole has a pole hole; a conductive structure, the conductive structure is arranged on the cover plate, the conductive structure has a slot structure with a notch facing the side away from the pole, and the pole hole is connected to the slot structure; an adapter, the adapter is arranged on the conductive structure, the adapter is sealed at the notch of the slot structure, the adapter and the conductive structure form a accommodating cavity, and the pole is electrically connected to the adapter through the conductive structure.

[0009] Furthermore, the cover plate has a mounting hole, the conductive structure has an arched plate section arched toward one side of the pole and a flange plate section arranged on the outer periphery of the arched plate section, the arched plate section extends into the mounting hole and is connected to the pole, the arched plate section forms a groove structure, and the flange plate section is connected to the surface of the cover plate on the side away from the pole.

[0010] Furthermore, the arched plate segment and the flange plate segment are an integrated structure; and / or the arched plate segment is welded to the pole.

[0011] Furthermore, the arched plate segment has a via structure connected to the groove structure.

[0012] Further, the pole has a protruding portion, a portion of the pole hole is formed on the protruding portion, and at least a portion of the protruding portion extends into the via structure.

[0013] Furthermore, the pole also has a body portion, which is an integrated structure with the extension portion, and the body portion abuts against a surface of the cover plate on a side away from the flange plate section, and the body portion and the flange plate section are clamped on both sides of the cover plate.

[0014] Furthermore, the cell top cover also includes a pad structure arranged between the pole and the cover plate, and the pad structure is arranged along the circumference of the pole.

[0015] Furthermore, a liquid injection hole is provided on the cover plate, two poles are provided, and the liquid injection hole is provided between the two poles.

[0016] Furthermore, the battery cell top cover also includes an explosion-proof valve arranged on the cover plate, two poles are arranged, and the explosion-proof valve is arranged between the two poles.

[0017] According to another aspect of the utility model, a battery cell is provided, which includes the above-mentioned battery cell top cover, pole core and shell, the pole core is electrically connected to the adapter plate of the battery cell top cover, the cover plate of the battery cell top cover is fixedly connected to the shell, the cover plate and the shell cooperate to form an installation cavity, and the pole core is arranged inside the installation cavity.

[0018] By applying the technical solution of the utility model, the top cover of the battery cell includes a cover plate, a pole, a conductive structure and an adapter plate. The pole is arranged on the cover plate, and a pole hole is provided on the pole. The conductive structure is arranged on the cover plate, and the conductive structure has a slot structure with a notch facing the side away from the pole. The pole hole is connected to the slot structure. The adapter plate is arranged on the conductive structure, and the adapter plate is sealed at the notch of the slot structure. The adapter plate and the conductive structure form a accommodating cavity, and the pole is electrically connected to the adapter plate through the conductive structure.

[0019] From the above, it can be seen that a pole hole is provided on the pole of the battery cell top cover of the present application, and the conductive structure and the adapter cooperate to form a accommodating cavity, and then air is inflated into the interior of the accommodating cavity through the pole hole, so as to realize the stability of the welding between the adapter and the conductive structure by air pressure detection, and the stability of the adapter is reflected only by whether there is air leakage, without destroying the material; at the same time, the welding stability of the adapter is detected only by whether there is air leakage, and the detection operation is simple and the detection efficiency is high.

[0020] The present application facilitates the detection of the welding quality between the adapter and the top cover through inflation detection, so as to avoid the occurrence of cold welding and broken welding between the adapter and the cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1 A schematic diagram of the three-dimensional structure of the battery cover of the utility model is shown;

[0023] Figure 2 A cross-sectional view showing the installation structure of the pole and the conductive structure of the utility model;

[0024] Figure 3 A cross-sectional view of a battery cell cover plate of the utility model is shown;

[0025] Figure 4 A three-dimensional structural schematic diagram of the battery cell of the utility model is shown.

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

[0027] 10. Cover plate; 110. Mounting hole; 120. Filling hole; 20. Pole; 201. Pole hole; 210. Main body; 220. Extension; 30. Conductive structure; 310. Arched plate section; 311. Groove structure; 320. Flange plate section; 40. Adapter; 410. Accommodating cavity; 50. Pad structure; 60. Explosion-proof valve; 70. Shell. 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] Embodiment 1

[0032] In order to solve the problems of material damage and low detection success rate in the detection of adapter welding quality in the prior art, this embodiment provides a battery cell top cover.

[0033] like Figures 1 to 3 As shown, the battery cell top cover includes a cover plate 10, a pole 20, a conductive structure 30 and an adapter plate 40. The pole 20 is arranged on the cover plate 10, and the pole 20 has a pole hole 201. The conductive structure 30 is arranged on the cover plate 10. The conductive structure 30 has a groove structure 311 with a notch facing the side away from the pole 20. The pole hole 201 is connected to the groove structure 311. The adapter plate 40 is arranged on the conductive structure 30. The adapter plate 40 is sealed at the notch of the groove structure 311. The adapter plate 40 and the conductive structure 30 form a accommodating cavity 410. The pole 20 is electrically connected to the adapter plate 40 through the conductive structure 30.

[0034] Specifically, a pole hole 201 is provided on the pole 20 of the battery cell top cover of the present application, and the conductive structure 30 and the adapter plate 40 cooperate to form a accommodating chamber 410, and then air is inflated into the interior of the accommodating chamber 410 through the pole hole 201 to achieve the stability of the setting of the adapter plate 40 by air pressure detection, and the stability of the welding between the adapter plate 40 and the top cover is reflected only by whether there is air leakage, without destroying the material; at the same time, the welding stability of the adapter plate 40 is detected only by whether there is air leakage, which is simple to operate and has high detection efficiency.

[0035] Among them, the cover plate 10 of the present application adopts a cubic structure of aluminum material. The aluminum material has a certain strength to resist external collisions and protect the internal performance of the battery cell from being affected, while also achieving a good heat dissipation effect.

[0036] Furthermore, the positive electrode column and the negative electrode column are arranged at two ends of the cover plate 10 along the length direction of the cover plate 10 , and both the positive electrode column and the negative electrode column have a column hole 201 .

[0037] Furthermore, the poles 20 are arranged in pairs, one of the two poles 20 is a positive pole and the other is a negative pole; the adapter plates 40 are arranged in pairs, the adapter plates 40 are arranged in a one-to-one correspondence with the poles 20, one of the paired adapter plates 40 is a positive adapter plate, and the other is a negative adapter plate; the conductive structures 30 are arranged in pairs, one of the paired conductive structures 30 is a positive conductive structure, and the other is a negative conductive structure; the positive pole is electrically connected to the positive adapter plate through the positive conductive structure, and the negative pole is electrically connected to the negative adapter plate through the negative conductive structure.

[0038] In this embodiment, the adapter plate 40 is welded to the conductive structure 30, and the accommodating cavity 410 serves as an airtightness detection cavity. The accommodating cavity 410 is used to provide space for gas. By inflating the accommodating cavity 410, it is possible to detect whether gas flows out of the weld or the adapter plate 40 falls off directly, thereby detecting whether there are problems of cold solder joints and broken solder joints in the connection between the adapter plate 40 and the top cover (the adapter plate 40 is connected to the top cover through the conductive structure).

[0039] like Figure 1 and Figure 2 As shown, the cover plate 10 has a mounting hole 110, and the conductive structure 30 has an arched plate segment 310 arched toward the side of the pole 20 and a flange plate segment 320 arranged on the outer periphery of the arched plate segment 310. The arched plate segment 310 extends into the mounting hole 110 and is connected to the pole 20. The arched plate segment 310 forms a groove structure 311, and the flange plate segment 320 is connected to the surface of the cover plate 10 on the side away from the pole 20.

[0040] Specifically, the conductive structure 30 is arranged between the pole 20 and the adapter plate 40. A groove structure 311 is formed on the conductive structure 30 to facilitate the formation of a receiving cavity 410 between the conductive structure 30 and the adapter plate 40. The groove structure 311 is formed by the arch of the arched plate segment 310, so that the adapter plate 40 and the flange plate segment 320 of the flat plate structure are connected in a surface-to-surface manner, which is beneficial to enhance the stability of the connection between the adapter plate 40 and the conductive structure 30.

[0041] Among them, the flange plate segment 320 adopting a flat plate structure is not only convenient for welding with the adapter plate 40, but the end of the flange plate segment 320 facing away from the adapter plate 40 can also be connected to the surface of the cover plate 10 by surface contact, which is beneficial to improve the installation stability of the conductive structure 30 and ensure the stability of conduction.

[0042] Furthermore, the flange plate segment 320 is an annular structure as a whole, so that the flange plate segment 320 and the portion of the cover plate 10 located in the outer peripheral area of ​​the mounting hole 110 can be in contact and fixedly connected.

[0043] Furthermore, the arched plate segment 310 and the flange plate segment 320 are an integrated structure, which is beneficial to ensuring the conductive efficiency and also helps to improve the overall strength.

[0044] Furthermore, the arched plate section 310 is welded to the pole 20 to provide fixation for the installation of the pole 20 and achieve the effect of electrical conduction. The welding method may be laser welding.

[0045] Furthermore, the flange plate segment 320 is connected to the cover plate 10, and the flange plate segment 320 and the cover plate 10 are fixed by welding, which is beneficial to improve the stability of the connection.

[0046] In this embodiment, the arched plate segment 310 has a via structure communicating with the groove structure 311 .

[0047] like Figure 2 As shown, the pole 20 has a protruding portion 220 , a portion of the pole hole 201 is formed on the protruding portion 220 , and at least a portion of the protruding portion 220 extends into the via structure.

[0048] Among them, the pole hole 201 passes through the pole 20 and extends into the via structure through the extension part 220. When the extension length of the extension part 220 is less than the length of the via structure, the pole hole 201 located on the extension part 220 can be connected with the via structure; when the extension length of the extension part 220 is greater than the length of the via structure, the pole hole 201 is directly connected with the slot structure 311.

[0049] Furthermore, the pole 20 also has a body portion 210 , which is an integrated structure with the extension portion 220 . The body portion 210 abuts against the surface of the cover plate 10 on the side away from the flange plate segment 320 , and the body portion 210 and the flange plate segment 320 are clamped on both sides of the cover plate 10 .

[0050] During installation, the main body 210 is abutted against one side of the cover plate 10, the extension portion 220 is fixedly connected to the conductive structure 30, and a part of the extension portion 220 is fixedly connected to the other side of the cover plate 10, thereby realizing that the pole 20 and the conductive structure 30 are arranged on the cover plate 10.

[0051] In order to ensure that there is no gap between the pole 20 and the cover plate 10, the cell top cover further includes a pad structure 50 disposed between the pole 20 and the cover plate 10, and the pad structure 50 is disposed along the circumference of the pole 20. The pad structure 50 is an annular structure, and the pad structure 50 prevents dust, water vapor, etc. from entering the interior of the mounting hole 110 through the gap between the pole 20 and the cover plate 10, so as to increase the sealing between the pole 20 and the cover plate 10.

[0052] like Figure 1 and Figure 3 As shown, a liquid injection hole 120 is also provided on the cover plate 10, and the liquid injection hole 120 is arranged between the two poles 20, and the distance between the liquid injection hole 120 and the positive pole is smaller than the distance between the liquid injection hole 120 and the negative pole.

[0053] The injection hole 120 is provided to facilitate the subsequent injection operation. When the cover plate 10 is covered on the shell 70 , liquid can be injected into the inner cavity of the shell 70 through the injection hole 120 .

[0054] In this embodiment, the battery cell top cover further includes an explosion-proof valve 60 disposed on the cover plate 10 . The explosion-proof valve 60 is disposed between the two poles 20 to release pressure when the pressure inside the battery cell is too high to avoid explosion.

[0055] Embodiment 2

[0056] This embodiment provides a battery cell, and the battery cell includes the battery cell top cover in the first embodiment.

[0057] like Figure 4As shown, the battery cell also includes a pole core and a shell 70. The pole core is electrically connected to the adapter plate 40 of the battery cell top cover. The cover plate 10 of the battery cell top cover is fixedly connected to the shell 70. The cover plate 10 and the shell 70 cooperate to form an installation cavity, and the pole core is arranged inside the installation cavity.

[0058] The pole core is welded to the adapter 40 to form a whole, and then the cover plate 10 is installed in conjunction with the shell 70, and the pole ears are assembled to form a battery cell. The shell 70 has a top opening, and the cover plate 10 is arranged at the top opening. The cover plate 10 and the shell 70 are interference fit and are welded and fixed by means of laser welding. The welding means can be laser welding.

[0059] In this embodiment, the shell 70 is an aluminum shell. The aluminum material has a certain strength to resist external collisions and protect the internal performance of the battery cell from being affected, while also achieving a good heat dissipation effect.

[0060] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0061] A pole hole 201 is provided on the pole 20 of the cell top cover of the present application, and the conductive structure 30 and the adapter plate 40 cooperate to form a accommodating chamber 410, and then air is inflated into the interior of the accommodating chamber 410 through the pole hole 201, so as to realize the stability of the welding of the adapter plate 40 by air pressure detection, and the stability of the welding between the adapter plate 40 and the top cover is reflected only by whether there is air leakage, without destroying the material; at the same time, the welding stability of the adapter plate 40 is detected only by whether there is air leakage, which is simple to operate and has high detection efficiency.

[0062] The present application facilitates the detection of the welding quality of the adapter plate 40 through inflation detection, so as to avoid the occurrence of cold welding or broken welding between the adapter plate 40 and the cover plate 10 .

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 battery cell top cover, characterized in that: include: Cover plate (10); A pole (20), the pole (20) being arranged on the cover plate (10), and having a pole hole (201); A conductive structure (30), the conductive structure (30) being arranged on the cover plate (10), the conductive structure (30) having a slot structure (311) with a notch facing a side away from the pole (20), the pole hole (201) being in communication with the slot structure (311); An adapter plate (40), the adapter plate (40) being arranged on the conductive structure (30), the adapter plate (40) covering the notch of the slot structure (311), the adapter plate (40) and the conductive structure (30) forming a receiving cavity (410), and the pole (20) being electrically connected to the adapter plate (40) via the conductive structure (30).

2. The battery cell top cover according to claim 1, characterized in that: The cover plate (10) is provided with a mounting hole (110), the conductive structure (30) comprises an arched plate section (310) arched toward one side of the pole (20) and a flange plate section (320) arranged at the outer periphery of the arched plate section (310), the arched plate section (310) extends into the mounting hole (110) and is connected to the pole (20), the arched plate section (310) forms the groove structure (311), and the flange plate section (320) is connected to the surface of the cover plate (10) on a side facing away from the pole (20).

3. The battery cell top cover according to claim 2, characterized in that: The arched plate segment (310) and the flange plate segment (320) are an integrated structure; and / or The arched plate segment (310) is welded to the pole (20).

4. The battery cell top cover according to claim 2, characterized in that: The arched plate section (310) has a via structure connected to the groove structure (311).

5. The battery cell top cover according to claim 4, characterized in that: The pole (20) has a protruding portion (220), a portion of the pole hole (201) is formed on the protruding portion (220), and at least a portion of the protruding portion (220) extends into the via structure.

6. The battery cell top cover according to claim 5, characterized in that: The pole (20) further comprises a main body (210), the main body (210) and the extension (220) being an integral structure, the main body (210) being in contact with a surface of the cover plate (10) on a side away from the flange plate segment (320), and the main body (210) and the flange plate segment (320) being clamped on both sides of the cover plate (10).

7. The battery cell top cover according to claim 6, characterized in that: The battery cell top cover also includes a pad structure (50) arranged between the pole (20) and the cover plate (10), and the pad structure (50) is arranged along the circumference of the pole (20).

8. The battery cell top cover according to any one of claims 1 to 7, characterized in that: The cover plate (10) is also provided with a liquid injection hole (120), two poles (20) are provided, and the liquid injection hole (120) is arranged between the two poles (20).

9. The battery cell top cover according to any one of claims 1 to 7, characterized in that: The battery cell top cover also includes an explosion-proof valve (60) arranged on the cover plate (10); two poles (20) are provided, and the explosion-proof valve (60) is arranged between the two poles (20).

10. A battery cell, characterized in that: The battery cell comprises: The battery cell top cover according to any one of claims 1 to 9; A pole core, the pole core being electrically connected to a switching piece (40) of a top cover of the battery cell; The housing (70) is fixedly connected to the cover plate (10) of the top cover of the battery cell, the cover plate (10) and the housing (70) cooperate to form a mounting cavity, and the pole core is arranged inside the mounting cavity.

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