Battery cell sealing structure, battery cell and battery module

Abstract

The utility model provides a battery cell sealing structure, a battery cell and a battery module, and belongs to the technical field of batteries. A positioning part is formed on the first plastic part; a current collecting sheet; a second plastic part; the terminal is provided with a pole column, and the pole column sequentially penetrates through the second plastic part, the bottom shell, the first plastic part and the current collecting piece to form a pressing rivet disc; the sealing piece comprises a first sealing part, a second sealing part and an extending part. The sealing element has the beneficial effects that the new extension part is formed on the L-shaped sealing element in the prior art, the extension part is connected with one end, where the second sealing part is located, of the first sealing part, the first sealing part is in contact with the pole for sealing, the second sealing part is used for positioning, the sealing volume in the whole structure is increased through the extension part, and the sealing effect is improved. The sealing effect is effectively improved, and the risks of battery cell liquid leakage, short circuit and the like are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries and relates to a battery core sealing structure, a battery core and a battery module. Background Art

[0002] The booming new energy industry has garnered significant attention and attention for battery systems. The battery cell, as the smallest unit of a battery, has been the subject of extensive research. Due to the presence of electrolyte, sealing the battery cell is a key technology. Besides the upper and lower housings, the sealing performance of the terminal assembly is a crucial factor influencing battery cell performance.

[0003] In the prior art, the bottom shell and the sealing ring of the pole are generally brought into contact and sealed by riveting. The existing sealing ring generally has an "L"-shaped cross-section and is embedded between the shell and the pole. The sealing area is small. Therefore, there is a possibility that the sealing ring may not fit well during the tightening process, resulting in unstable sealing, leakage, etc., leaving much room for improvement. Utility Model Content

[0004] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a battery core sealing structure, a battery core and a battery module.

[0005] The purpose of the utility model can be achieved through the following technical solutions: A battery core sealing structure, comprising:

[0006] bottom shell;

[0007] a first plastic member, one surface of which contacts one surface of the bottom shell, the first plastic member being formed with a positioning portion;

[0008] a current collecting sheet in contact with the other surface of the first plastic component;

[0009] a second plastic member, one surface of which contacts the other surface of the housing body;

[0010] a terminal in contact with the other surface of the second plastic part, the terminal being provided with a pole, the pole sequentially passing through the second plastic part, the bottom shell, the first plastic part, and the current collecting sheet to form a rivet plate;

[0011] A seal comprising a first sealing portion, a second sealing portion, and an extension portion, wherein the first sealing portion contacts the pole, the first sealing portion is distributed along the axial direction of the pole from the first plastic part toward the second plastic part, the second sealing portion is connected to an end of the first sealing portion, the first sealing portion is distributed along the circumferential direction of the pole and is located at the positioning portion, and the extension portion is connected to the end of the first sealing portion where the second sealing portion is located.

[0012] In the above-mentioned battery cell sealing structure, the extension portion includes a third sealing portion, one end of the third sealing portion is connected to the end of the first sealing portion where the second sealing portion is located, and the third sealing portion is distributed from the first plastic part toward the current collecting sheet along the axial direction of the pole.

[0013] In the above-mentioned battery cell sealing structure, an end of the third sealing portion away from the first sealing portion contacts the riveting disk.

[0014] In the above-mentioned battery cell sealing structure, the extension portion further includes a fourth sealing portion, the fourth sealing portion is connected to an end of the third sealing portion away from the first sealing portion, and the fourth sealing portion is distributed along the circumferential direction of the pole.

[0015] In the above-mentioned battery cell sealing structure, the current collecting sheet is provided with a receiving groove, and the fourth sealing portion is located in the receiving groove.

[0016] In the above-mentioned battery cell sealing structure, the riveting plate contacts the bottom surface of the accommodating groove through the fourth sealing portion.

[0017] In the above-mentioned battery cell sealing structure, one end of the first sealing portion away from the second sealing portion is in contact with the terminal.

[0018] In the above-mentioned battery cell sealing structure, the second sealing portion is located between the bottom shell and the current collecting piece, the bottom shell is in contact with the second sealing portion, and the second sealing portion is in contact with the current collecting piece.

[0019] Secondly, a battery cell includes the battery cell sealing structure.

[0020] Again, a battery module includes the above-mentioned battery cell.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. A new extension is formed on the "L"-shaped seal of the prior art. The extension is connected to one end of the first sealing part where the second sealing part is located. The first sealing part contacts the pole for sealing, and the second sealing part is used for positioning. The extension increases the sealing volume in the overall structure, effectively improving the sealing effect and reducing the risks of battery cell leakage, short circuit, etc.

[0023] 2. The first sealing part, the second sealing part and the third sealing part form a "T"-shaped structure. The first sealing part and the third sealing part are in contact with the pole for sealing, and the second sealing part is used for positioning, which effectively improves the sealing effect and reduces the risks of battery leakage, short circuit, etc.

[0024] 3. The end of the third sealing part away from the first sealing part contacts the rivet plate, which increases the sealing area. At the same time, it positions the rivet plate when the pole is riveted to form the rivet plate, ensuring a good sealing effect.

[0025] 4. The first sealing part, the second sealing part, the third sealing part and the fourth sealing part are combined to form an "F"-shaped structure. The first sealing part and the third sealing part are in contact with the pole for sealing, the second sealing part is used for positioning, and the fourth sealing part is in contact with the rivet disk, thereby increasing the sealing area. At the same time, the rivet disk is positioned when the pole is riveted to form the rivet disk, which effectively improves the sealing effect and reduces the risks of battery cell leakage, short circuit, etc.

[0026] 5. The fourth sealing portion is located in the accommodating groove, and the accommodating groove positions the seal through the fourth sealing portion to prevent the seal from moving randomly along the axial direction of the pole and causing wear, thereby improving the sealing performance.

[0027] 6. The rivet plate contacts the bottom surface of the receiving groove through the fourth sealing portion, which increases the sealing area. At the same time, the rivet plate is positioned when the pole is riveted to form the rivet plate, ensuring a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an exploded view of the battery cell of Example 1 of the present utility model.

[0029] Figure 2 This is a schematic structural diagram of a battery cell according to the first embodiment of the present invention.

[0030] Figure 3 for Figure 2 Cross-sectional view from the AA perspective.

[0031] Figure 4 for Figure 3 Magnified view of part B.

[0032] Figure 5 This is a schematic structural diagram of the terminal of the first embodiment of the present invention.

[0033] Figure 6 This is a schematic structural diagram of the sealing member according to the first embodiment of the present invention.

[0034] Figure 7 This is an exploded view of the battery cell of the second embodiment of the present invention.

[0035] Figure 8 This is a schematic structural diagram of a battery cell according to the second embodiment of the present invention.

[0036] Figure 9 for Figure 8 Cross-sectional view from CC perspective.

[0037] Figure 10 for Figure 9 An enlarged view of part D.

[0038] Figure 11 This is a schematic structural diagram of the terminal of the second embodiment of the present utility model.

[0039] Figure 12 This is a structural schematic diagram of the current collecting sheet of the second embodiment of the present utility model.

[0040] Figure 13 This is a front view of the sealing member of the second embodiment of the present invention.

[0041] Figure 14 for Figure 13 Cross-sectional view from the EE perspective.

[0042] In the figure, 100, bottom shell; 200, first plastic part; 300, current collecting sheet; 310, receiving groove; 400, second plastic part; 500, terminal; 510, pole; 520, riveting plate; 600, sealing part; 610, first sealing part; 620, second sealing part; 630, third sealing part; 640, fourth sealing part. DETAILED DESCRIPTION

[0043] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0046] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0047] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0048] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0049] Example 1

[0050] like Figures 1-6 As shown, a battery cell sealing structure includes: a bottom shell 100, a first plastic component 200, a current collector 300, a second plastic component 400, a terminal 500 and a sealing component 600.

[0051] One side of the first plastic component 200 contacts one side of the bottom shell 100 , and a positioning portion (not shown) is formed on the first plastic component 200 .

[0052] The current collecting sheet 300 contacts the other surface of the first plastic component 200 .

[0053] One surface of the second plastic component 400 contacts the other surface of the bottom shell 100 .

[0054] The terminal 500 contacts the other side of the second plastic part 400 . The terminal 500 is provided with a pole 510 . The pole 510 passes through the second plastic part 400 , the bottom shell 100 , the first plastic part 200 and the current collecting sheet 300 in sequence to form a rivet plate 520 .

[0055] In which, the seal 600 includes a first sealing portion 610, a second sealing portion 620 and an extension portion. The first sealing portion 610 contacts the pole 510. The first sealing portion 610 is distributed along the axial direction of the pole 510 from the first plastic part 200 toward the second plastic part 400. The second sealing portion 620 is connected to the end of the first sealing portion 610. The first sealing portion 610 is distributed along the circumferential direction of the pole 510 and is located at the positioning portion. The extension portion is connected to the end of the first sealing portion 610 where the second sealing portion 620 is located.

[0056] It is worth noting here that the inner diameter of the first plastic part 200 is larger than the inner diameter of the bottom shell 100 and the inner diameter of the second plastic part 400, thereby forming a positioning portion, which is actually a space. The positioning portion positions the seal 600 through the second sealing portion 620, preventing the seal 600 from moving arbitrarily along the axial direction of the pole 510 and causing wear, thereby improving the sealing performance.

[0057] In this embodiment, a new extension portion is formed on the "L"-shaped seal 600 of the prior art, and the extension portion is connected to one end of the first sealing portion 610 where the second sealing portion 620 is located. The first sealing portion 610 is in contact with the pole 510 for sealing, and the second sealing portion 620 is used for positioning. The extension portion increases the sealing volume in the overall structure, effectively improving the sealing effect and reducing the risks of battery cell leakage, short circuit, etc.

[0058] like Figures 1-6 As shown, based on the above embodiment, the extension portion includes a third sealing portion 630, one end of the third sealing portion 630 is connected to the end of the first sealing portion 610 where the second sealing portion 620 is located, and the third sealing portion 630 is distributed along the axial direction of the pole 510 from the first plastic part 200 toward the current collecting sheet 300.

[0059] In this embodiment, the first sealing part 610, the second sealing part 620 and the third sealing part 630 are combined to form a "T"-shaped structure. The first sealing part 610 and the third sealing part 630 are in contact with the pole 510 for sealing, and the second sealing part 620 is used for positioning, which effectively improves the sealing effect and reduces the risks of battery cell leakage, short circuit, etc.

[0060] like Figures 1-6 As shown, based on the above embodiment, one end of the third sealing portion 630 away from the first sealing portion 610 contacts the rivet plate 520 .

[0061] In this embodiment, the end of the third sealing portion 630 away from the first sealing portion 610 contacts the rivet plate 520, which increases the sealing area and positions the rivet plate 520 when the pole 510 is riveted to form the rivet plate 520, ensuring a good sealing effect.

[0062] like Figures 1-6 As shown, based on the above embodiment, one end of the first sealing portion 610 away from the second sealing portion 620 contacts the terminal 500 .

[0063] In this embodiment, the end of the first sealing portion 610 away from the second sealing portion 620 contacts the terminal 500, sealing the terminal 500 and preventing the seal 600 from moving arbitrarily along the axial direction of the pole 510 and causing wear, thereby improving the sealing performance.

[0064] like Figures 1-6 As shown, based on the above embodiment, the second sealing portion 620 is located between the bottom shell 100 and the current collecting piece 300 , the bottom shell 100 contacts the second sealing portion 620 , and the second sealing portion 620 contacts the current collecting piece 300 .

[0065] In this embodiment, the bottom shell 100 contacts the second sealing portion 620 , and the second sealing portion 620 contacts the current collecting piece 300 . The second sealing portion 620 not only positions the sealing member 600 at the positioning portion, but also seals the bottom shell 100 and the current collecting piece 300 .

[0066] Example 2

[0067] like Figure 7-14 As shown, the structure of embodiment 2 is the same as that of embodiment 1, except that the extension portion further includes a fourth sealing portion 640, the fourth sealing portion 640 is connected to an end of the third sealing portion 630 away from the first sealing portion 610, and the fourth sealing portion 640 is distributed along the circumferential direction of the pole 510.

[0068] In this embodiment, the first sealing portion 610, the second sealing portion 620, the third sealing portion 630 and the fourth sealing portion 640 are combined to form an "F"-shaped structure. The first sealing portion 610 and the third sealing portion 630 are in contact with the pole 510 for sealing, the second sealing portion 620 is used for positioning, and the fourth sealing portion 640 is in contact with the rivet disk 520, thereby increasing the sealing area. At the same time, when the pole 510 is riveted to form the rivet disk 520, it is positioned, thereby effectively improving the sealing effect and reducing the risks of battery cell leakage, short circuit, etc.

[0069] like Figure 7-14As shown, on the basis of the above embodiment, the current collecting piece 300 is provided with a receiving groove 310 , and the fourth sealing portion 640 is located in the receiving groove 310 .

[0070] In this embodiment, the fourth sealing portion 640 is located in the receiving groove 310. The receiving groove 310 positions the seal 600 through the fourth sealing portion 640 to prevent the seal 600 from moving arbitrarily along the axial direction of the pole 510 and causing wear, thereby improving the sealing performance.

[0071] like Figure 7-14 As shown, based on the above embodiment, the riveting plate 520 contacts the bottom surface of the receiving groove 310 through the fourth sealing portion 640.

[0072] In this embodiment, the riveting plate 520 contacts the bottom surface of the accommodating groove 310 through the fourth sealing portion 640, which increases the sealing area. At the same time, the riveting plate 520 is positioned when the pole 510 is riveted to form the riveting plate 520, ensuring a good sealing effect.

[0073] Example 3

[0074] like Figures 1-14 As shown, a battery cell includes a battery cell sealing structure described in Example 1 and Example 2.

[0075] Example 4

[0076] like Figures 1-14 As shown, a battery module includes a battery cell as described in Example 3.

Claims

1. A battery core sealing structure, characterized in that: include: bottom shell; a first plastic member, one surface of which contacts one surface of the bottom shell, the first plastic member being formed with a positioning portion; a current collecting sheet in contact with the other surface of the first plastic component; a second plastic member, one surface of which contacts the other surface of the bottom shell; a terminal in contact with the other surface of the second plastic part, the terminal being provided with a pole, the pole sequentially passing through the second plastic part, the bottom shell, the first plastic part, and the current collecting sheet to form a rivet plate; A seal comprising a first sealing portion, a second sealing portion, and an extension portion, wherein the first sealing portion contacts the pole, the first sealing portion is distributed along the axial direction of the pole from the first plastic part toward the second plastic part, the second sealing portion is connected to an end of the first sealing portion, the first sealing portion is distributed along the circumferential direction of the pole and is located at the positioning portion, and the extension portion is connected to the end of the first sealing portion where the second sealing portion is located.

2. A battery core sealing structure according to claim 1, characterized in that: The extension portion includes a third sealing portion, one end of which is connected to an end of the first sealing portion where the second sealing portion is located, and the third sealing portion is distributed from the first plastic part toward the current collecting piece along the axial direction of the pole.

3. A battery core sealing structure according to claim 2, characterized in that: An end of the third sealing portion away from the first sealing portion contacts the riveting disk.

4. The battery core sealing structure according to claim 2, wherein: The extension portion further includes a fourth sealing portion, the fourth sealing portion being connected to an end of the third sealing portion away from the first sealing portion, and the fourth sealing portion being distributed along the circumferential direction of the pole.

5. The battery core sealing structure according to claim 4, wherein: The current collecting piece is provided with a receiving groove, and the fourth sealing portion is located in the receiving groove.

6. A battery core sealing structure according to claim 5, characterized in that: The riveting plate contacts the bottom surface of the accommodating groove through the fourth sealing portion.

7. The battery core sealing structure according to claim 1, wherein: An end of the first sealing portion away from the second sealing portion contacts the terminal.

8. The battery core sealing structure according to claim 1, wherein: The second sealing portion is located between the bottom shell and the current collecting piece. The bottom shell contacts the second sealing portion, and the second sealing portion contacts the current collecting piece.

9. A battery cell, characterized in that: The invention comprises a battery core sealing structure as described in any one of claims 1 to 8.

10. A battery module, characterized in that: The invention comprises a battery cell as claimed in claim 9.

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