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, the battery cell sealing structure comprises: a bottom shell assembly, which comprises a bottom shell, a first plastic part, a collector sheet and a second plastic part; the terminal is in contact with the other face of the second plastic part, the terminal is provided with a pole, and the pole 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 first sealing element is located between the bottom shell assembly and the pole, and the bottom shell assembly is in contact with the pole through the first sealing element; and the bottom shell assembly is in contact with the terminal or the pressing rivet disc through the second sealing element. The utility model has the beneficial effects that the integral sealing performance is improved through double sealing, and the risks of liquid leakage, short circuit and the like of the battery cell 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 new energy industry is booming, and battery systems are attracting significant attention. As the smallest battery unit, the battery cell has been the subject of extensive research. Due to the presence of electrolyte, cell sealing is a key technology. Besides the upper and lower housings, the sealing performance of the terminal assembly is a crucial factor influencing cell performance.

[0003] In the prior art, the bottom shell assembly is generally brought into contact with the sealing ring of the pole by riveting to achieve compression and sealing. Therefore, one pole is in contact with the bottom shell assembly only through one sealing ring. As a result, there is a possibility that the sealing ring may not fit well during the compression process, resulting in unstable sealing, leakage, etc., and there is a large 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] A bottom shell assembly, comprising a bottom shell, a first plastic component, a current collecting sheet, and a second plastic component, wherein one surface of the first plastic component contacts one surface of the bottom shell, the current collecting sheet contacts another surface of the first plastic component, and one surface of the second plastic component contacts another surface of the bottom shell;

[0007] 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;

[0008] a first seal located between the bottom housing assembly and the pole, wherein the bottom housing assembly contacts the first seal, and the first seal contacts the pole;

[0009] A second sealing member, the bottom shell assembly contacts the second sealing member, and the second sealing member contacts the terminal or the riveting plate.

[0010] In the above-mentioned battery cell sealing structure, the terminal contacts the second sealing member, and the second sealing member contacts the second plastic member.

[0011] In the above-mentioned battery cell sealing structure, the terminal is provided with a first receiving groove, and the second sealing member is located in the first receiving groove and extends out of the first receiving groove to contact the second plastic member.

[0012] In the above-mentioned battery cell sealing structure, the second plastic member is provided with a second receiving groove, and the second sealing member is located in the second receiving groove and extends out of the second receiving groove to contact the terminal.

[0013] In the above-mentioned battery cell sealing structure, the riveting plate contacts the second sealing member, and the second sealing member contacts the current collecting sheet.

[0014] In the above-mentioned battery cell sealing structure, the current collecting sheet is provided with a third accommodating groove, and the second sealing member is located in the third accommodating groove and extends out of the third accommodating groove to contact the rivet plate.

[0015] In the above-mentioned battery cell sealing structure, the third accommodating groove is close to the pole, and the peripheral surface of the pole is in contact with the second sealing member.

[0016] In the above-mentioned cell sealing structure, the first sealant contacts the pole, the terminal contacts the first sealant, and the first sealant contacts the current collecting sheet.

[0017] In the above-mentioned cell sealing structure, the first sealant is in contact with the pole, and the terminal is in contact with the current collecting sheet through the first sealant.

[0018] Secondly, a battery cell includes the battery cell sealing structure.

[0019] Again, a battery module includes the above-mentioned battery cell.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The first sealing ring not only seals the pole and the bottom shell assembly from the circumferential direction of the pole, but also seals the terminal and the first plastic part from the axial direction of the pole through the second sealing member. This double sealing improves the overall sealing performance and reduces the risks of battery cell leakage, short circuit, etc.

[0022] 2. The second sealing member is located in the first receiving groove and extends out of the first receiving groove to contact the first plastic member. The first receiving groove positions the second sealing member to prevent the second sealing member from moving at will and causing wear, thereby improving the sealing performance.

[0023] 3. The second sealing member is located in the second receiving groove and extends out of the second receiving groove to contact the terminal. The second receiving groove positions the second sealing member to prevent the second sealing member from moving at will and causing wear, thereby improving the sealing performance.

[0024] 4. Not only is the first sealing ring used to seal the pole and the bottom shell assembly from the circumferential direction of the pole, but the second sealing member is also used to seal the rivet plate and the current collector from the axial direction of the pole. This double sealing improves the overall sealing performance and reduces the risks of battery cell leakage, short circuit, etc.

[0025] 5. The second sealing member is located in the third receiving groove and extends out of the third receiving groove to contact the riveting plate. The third receiving groove positions the second sealing member to prevent the second sealing member from moving at will and causing wear, thereby improving the sealing performance.

[0026] 6. The circumferential surface of the pole contacts the second sealing member, so the second sealing ring not only seals between the rivet plate and the current collecting sheet in the axial direction of the pole, but also seals between the pole and the current collecting sheet in the circumferential direction of the pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is an exploded view of the battery cell of Example 1 of the present utility model.

[0028] Figure 2 This is a schematic structural diagram of a battery cell according to the first embodiment of the present invention.

[0029] Figure 3 for Figure 2 Cross-sectional view from the AA perspective.

[0030] Figure 4 for Figure 3 Magnified view of part B.

[0031] Figure 5 This is a schematic structural diagram of the terminal of the first embodiment of the present invention.

[0032] Figure 6 This is a structural diagram of the second plastic component in the first embodiment of the present utility model.

[0033] Figure 7 This is an exploded view of the battery cell of the second embodiment of the present utility model.

[0034] Figure 8 This is a schematic structural diagram of a battery cell according to the second embodiment of the present invention.

[0035] Figure 9 for Figure 8 Cross-sectional view from CC perspective.

[0036] Figure 10 for Figure 9 An enlarged view of part D.

[0037] Figure 11 This is a schematic structural diagram of the terminal of the second embodiment of the present utility model.

[0038] Figure 12 This is a structural schematic diagram of the current collecting sheet of the second embodiment of the present utility model.

[0039] In the figure, 100, bottom shell; 200, first plastic part; 300, current collector; 310, third receiving groove; 400, second plastic part; 410, second receiving groove; 500, terminal; 510, pole; 520, rivet plate; 530, first receiving groove; 600, first sealing member; 700, second sealing member. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] Example 1

[0047] like Figures 1-6 As shown, a battery cell sealing structure includes: a bottom shell assembly, a terminal 500, a first sealing member 600 and a second sealing member 700.

[0048] Among them, the bottom shell assembly includes a bottom shell 100, a first plastic part 200, a current collecting piece 300 and a second plastic part 400. One side of the first plastic part 200 contacts one side of the bottom shell 100, the current collecting piece 300 contacts the other side of the first plastic part 200, and one side of the second plastic part 400 contacts the other side of the bottom shell 100.

[0049] 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 .

[0050] The first sealing member 600 is located between the bottom housing assembly and the pole 510 , and the bottom housing assembly is in contact with the pole 510 through the first sealing member 600 .

[0051] The terminal 500 contacts the second sealing member 700 , and the second sealing member 700 contacts the first plastic member 200 .

[0052] In this embodiment, not only is the first sealing ring used to seal the pole 510 and the bottom shell assembly from the circumferential direction of the pole 510, but the second sealing member 700 is also used to seal the terminal 500 and the first plastic member 200 from the axial direction of the pole 510. This double sealing improves the overall sealing performance and reduces the risks of battery cell leakage, short circuit, etc.

[0053] like Figures 1-6As shown, based on the above embodiment, the terminal 500 is provided with a first receiving groove 530 , and the second sealing member 700 is located in the first receiving groove 530 and extends out of the first receiving groove 530 to contact the second plastic member 400 .

[0054] In this embodiment, the second sealing member 700 is located in the first receiving groove 530 and extends out of the first receiving groove 530 to contact the second plastic member 400. The first receiving groove 530 positions the second sealing member 700 to prevent the second sealing member 700 from moving at will and causing wear, thereby improving the sealing performance.

[0055] like Figures 1-6 As shown, based on the above embodiment, the second plastic part 400 is provided with a second receiving groove 410 , and the second sealing member 700 is located in the second receiving groove 210 and extends out of the second receiving groove 410 to contact the terminal 500 .

[0056] In this embodiment, the second sealing member 700 is located in the second receiving groove 410 and extends out of the second receiving groove 410 to contact the terminal 500. The second receiving groove 410 positions the second sealing member 700 to prevent the second sealing member 700 from moving arbitrarily and causing wear, thereby improving the sealing performance.

[0057] It is worth noting that, in the actual manufacturing process, a first receiving groove 530 can be provided on the terminal 500 and a second receiving groove 410 can be provided on the second plastic part 400 , and the second sealing member 700 can be located in both the first receiving groove 530 and the second receiving groove 410 .

[0058] like Figures 1-6 As shown, based on the above embodiment, the first sealant 600 is in contact with the pole 510 , and the terminal 500 is in contact with the current collecting piece 300 through the first sealant 600 .

[0059] In this embodiment, 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 positioning the "L"-shaped first sealing member 600, preventing the first sealing member 600 from moving arbitrarily and causing wear, and improving the sealing performance.

[0060] Example 2

[0061] like Figure 7-12 As shown, a battery cell sealing structure includes: a bottom shell assembly, a terminal 500, a first sealing member 600 and a second sealing member 700.

[0062] Among them, the bottom shell assembly includes a bottom shell 100, a first plastic part 200, a current collecting piece 300 and a second plastic part 400. One side of the first plastic part 200 contacts one side of the bottom shell 100, the current collecting piece 300 contacts the other side of the first plastic part 200, and one side of the second plastic part 400 contacts the other side of the bottom shell 100.

[0063] 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 .

[0064] The first sealing member 600 is located between the bottom housing assembly and the pole 510 . The bottom housing assembly contacts the first sealing member 600 , and the first sealing member 600 contacts the pole 510 .

[0065] The riveting plate 520 contacts the second sealing member 700 , and the second sealing member 700 contacts the current collecting piece 300 .

[0066] In this embodiment, not only is the pole 510 and the bottom shell assembly sealed from the circumferential direction of the pole 510 by the first sealing ring, but the rivet plate 520 and the current collector 300 are also sealed from the axial direction of the pole 510 by the second sealing member 700. This double sealing improves the overall sealing performance and reduces the risks of battery cell leakage, short circuit, etc.

[0067] like Figure 7-12 As shown, based on the above embodiment, the current collecting piece 300 is provided with a third receiving groove 310 , and the second sealing member 700 is located in the third receiving groove 310 and extends out of the third receiving groove 310 to contact the rivet plate 520 .

[0068] In this embodiment, the second seal 700 is located in the third accommodating groove 310 and extends out of the third accommodating groove 310 to contact the riveting plate 520. The third accommodating groove 310 positions the second seal 700 to prevent the second seal 700 from moving at will and causing wear, thereby improving the sealing performance.

[0069] like Figure 7-12 As shown, based on the above embodiment, the third receiving groove 310 is close to the pole 510 , and the circumference of the pole 510 is in contact with the second sealing member 700 .

[0070] In this embodiment, the circumferential surface of the pole 510 contacts the second seal 700 , so the second sealing ring not only seals between the rivet plate 520 and the current collecting plate 300 from the axial direction of the pole 510 , but also seals between the pole 510 and the current collecting plate 300 from the circumferential direction of the pole 510 .

[0071] like Figure 7-12 As shown, based on the above embodiment, the first sealant 600 contacts the pole 510 , the terminal 500 contacts the first sealant 600 , and the first sealant 600 contacts the current collecting piece 300 .

[0072] In this embodiment, 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 positioning the "L"-shaped first sealing member 600, preventing the first sealing member 600 from moving arbitrarily and causing wear, and improving the sealing performance.

[0073] Example 3

[0074] like Figures 1-12 As shown, a battery cell includes a battery cell sealing structure described in Example 1 and Example 2.

[0075] Example 4

[0076] like Figures 1-12 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: A bottom shell assembly, comprising a bottom shell, a first plastic component, a current collecting sheet, and a second plastic component, wherein one surface of the first plastic component contacts one surface of the bottom shell, the current collecting sheet contacts another surface of the first plastic component, and one surface of the second plastic component contacts another 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 first seal located between the bottom housing assembly and the pole, wherein the bottom housing assembly contacts the first seal, and the first seal contacts the pole; A second sealing member, the bottom shell assembly contacts the second sealing member, and the second sealing member contacts the terminal or the riveting plate.

2. A battery core sealing structure according to claim 1, characterized in that: The terminal contacts the second sealing member, and the second sealing member contacts the second plastic member.

3. A battery core sealing structure according to claim 2, characterized in that: The terminal is provided with a first accommodating groove, and the second sealing component is located in the first accommodating groove and extends out of the first accommodating groove to contact the second plastic component.

4. The battery core sealing structure according to claim 2, wherein: The second plastic member is provided with a second receiving groove, and the second sealing member is located in the second receiving groove and extends out of the second receiving groove to contact the terminal.

5. The battery core sealing structure according to claim 1, wherein: The riveting plate contacts the second sealing member, and the second sealing member contacts the current collecting piece.

6. A battery core sealing structure according to claim 5, characterized in that: The current collecting piece is provided with a third accommodating groove, and the second sealing member is located in the third accommodating groove and extends out of the third accommodating groove to contact the rivet plate.

7. A battery core sealing structure according to claim 6, characterized in that: The third accommodating groove is close to the pole, and a circumferential surface of the pole contacts the second sealing member.

8. The battery core sealing structure according to claim 1, wherein: The first sealant contacts the pole, the terminal contacts the first sealant, and the first sealant 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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