Battery cover plate, battery and vehicle

Abstract

The utility model provides a battery cover plate, battery and vehicle, relates to the vehicle part technical field, including cover plate body, first insulator, riveting block, pole and first sealing element, cover plate body, first insulator and riveting block are arranged along the calibration direction in proper order, first sealing element is arranged between first insulator and riveting block, and the first sealing element is arranged between first insulator and riveting block. One end of the pole sequentially penetrates through the cover plate body, the first insulating piece and the first sealing piece and is connected with the riveting block. The riveting block is assembled with the first insulating piece in a sealing mode through the first sealing piece, and the pole penetrates through the interior of the first sealing piece, so that electrolyte overflowing outwards from the liquid injection hole of the cover plate body cannot enter from an assembling gap between the first insulating piece and the riveting block, namely, the pole cannot make contact with the electrolyte, and the reliability of the cover plate is improved. Ion conduction between the pole and the cover plate body can be effectively avoided, and the problems of abnormal side voltage of the shell, shell corrosion, liquid leakage and the like are avoided; and the first sealing piece can buffer the riveting pressure of the riveting block, so that the first insulating piece is prevented from cracking.

Description

TECHNICAL FIELD

[0001] The utility model relates to the battery field, specifically, relate to a battery cover plate, battery and vehicle. BACKGROUND

[0002] Lithium battery has a wide application in new energy vehicles because of its high energy density. In the production process of lithium battery, after the assembly of the cover plate and the shell, liquid injection is needed. Specifically, an injection hole is arranged on the cover plate body (usually an aluminum sheet) of the cover plate, and electrolyte is injected into the shell through the injection hole. However, during the injection, the electrolyte is prone to overflow from the injection hole and flow into the cover plate through the corresponding assembly gap, which causes the positive or negative pole to form an ion conduction with the cover plate body, i.e. increases unnecessary ion flow path, which causes the current in the battery to be redistributed, and further changes the current flowing through the shell, which in turn causes the shell voltage to be abnormal, resulting in shell corrosion and battery leakage. SUMMARY

[0003] The utility model aims at solving the technical problem that the existing battery cover plate is prone to electrolyte flowing into it during injection.

[0004] In a first aspect, the utility model provides a battery cover plate, which comprises a cover plate body, a first insulating piece, a riveting block, a pole and a first sealing piece. The cover plate body, the first insulating piece and the riveting block are arranged in sequence along a reference direction. The first sealing piece is arranged between the first insulating piece and the riveting block. One end of the pole passes through the cover plate body, the first insulating piece and the first sealing piece in sequence and is connected with the riveting block.

[0005] Optionally, the first sealing piece is a sealing compression ring.

[0006] Optionally, one side of the first insulating piece towards the riveting block is provided with a mounting groove, and the riveting block is provided with a mounting boss matched with the mounting groove. The mounting boss is used for penetrating the first sealing piece to be inserted into the mounting groove, and the pole is used for penetrating the groove bottom of the mounting groove to be inserted into the riveting block.

[0007] Optionally, the compression rate of the first sealing piece is 25%-45%.

[0008] Optionally, the battery cover plate further comprises a second insulating piece and a second sealing piece, the second insulating piece is arranged on the side of the cover plate body away from the first insulating piece, the second sealing piece is sleeved outside the pole column, the second sealing piece has a stepped structure and comprises a first sealing section and a second sealing section connected in sequence, the cover plate body is provided with a first through hole for the pole column to pass through, the second insulating piece is provided with a second through hole for the pole column to pass through, the second through hole is in position correspondence with the first through hole, the first sealing section is located between the pole column and the hole wall of the first through hole, and the second sealing section is located between the pole column and the hole wall of the second through hole.

[0009] Optionally, the first sealing piece and the second sealing piece are made of fluororubber.

[0010] Optionally, the pole column is provided with two pole columns, the two pole columns have the same polarity, and the two pole columns are connected with the same riveting block.

[0011] Optionally, the end of the cover plate body away from the pole column is provided with a liquid injection hole.

[0012] In a second aspect, the utility model provides a kind of battery, comprising the battery cover plate described above.

[0013] In a third aspect, the utility model further provides a kind of vehicle, comprising the battery described above.

[0014] The battery cover plate, battery and vehicle of the utility model have at least the following advantages compared with prior art:

[0015] The cover plate body can be an aluminum sheet, the calibration direction can be the thickness direction of the cover plate body, the cover plate body, the first insulating piece and the riveting block are sequentially arranged along the thickness direction of the cover plate body, one end of the pole column passes through the sequentially arranged cover plate body, the first insulating piece and is connected with the riveting block to form the battery cover plate, realizing the function of the ordinary battery cover plate. At the same time, the riveting block is sealed and assembled with the first insulating piece through the first sealing piece, and the pole column passes through the inside of the first sealing piece, so that the electrolyte overflowing from the liquid injection hole of the cover plate body cannot enter from the assembly gap between the first insulating piece and the riveting block, that is, the pole column will not contact the electrolyte, which can effectively avoid the ion conduction between the pole column and the cover plate body, and avoid the problems of abnormal shell side voltage, shell corrosion, liquid leakage and the like. In addition, when the riveting block is riveted with the pole column, the riveting pressure of the riveting block is buffered by the first sealing piece and then acts on the first insulating piece, which can effectively prevent the first insulating piece from cracking. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the battery cover plate of the utility model embodiment;

[0017] Figure 2The exploded structural schematic view of the battery cover plate of the embodiment of the utility model;

[0018] Figure 3 The sectional view of the battery cover plate of the embodiment of the utility model;

[0019] Figure 4 For Figure 3 The enlarged schematic view of A in the middle.

[0020] Mark explanation:

[0021] 1, cover plate body;11, first through hole;12, liquid injection hole;2, first insulating piece;21, mounting groove;3, riveting block;31, mounting boss;4, pole;5, first sealing piece;6, second insulating piece;61, second through hole;7, second sealing piece;71, first sealing section;72, second sealing section;8, tab connecting piece. Specific implementation

[0022] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings.

[0023] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "cooperation" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0024] In addition, it should be noted that in the description of the utility model, the terms and nouns in each embodiment, such as "up", "down", "front", "back" and other words indicating the position, are only for the purpose of simplifying the description of the position relationship based on the drawings of the specification, and do not represent the elements and devices indicated by the specific position and the operation and method, structure defined in the specification must be operated, and such position terms do not constitute a limitation on the utility model.

[0025] This paper establishes Z axis, wherein, Z axis represents the up and down direction, the positive direction of Z axis represents the upper side, and the negative direction of Z axis represents the lower side. At the same time, it should be noted that the meaning of the foregoing Z axis is only for the purpose of describing the utility model and simplifying the description, and is not indicative or suggestive of the device or element indicated by the specific position, structure and operation, so it cannot be understood as a limitation on the utility model.

[0026] As Figures 1-2As shown, the battery cover plate of the embodiment of the utility model, including cover plate body 1, first insulating piece 2, riveting block 3, pole 4 and first sealing piece 5, cover plate body 1, first insulating piece 2 and riveting block 3 are sequentially arranged along the calibration direction, first sealing piece 5 is arranged between first insulating piece 2 and riveting block 3, one end of pole 4 sequentially passes through cover plate body 1, first insulating piece 2, first sealing piece 5 and is connected with riveting block 3.

[0027] Specifically, the battery cover plate can be a blade lithium battery cover plate. Taking the vertical arrangement of the blade battery as an example, the blade battery includes an aluminum shell in addition to the battery cover plate, and the battery cover plate can be located above the aluminum shell. The cover plate body 1 can be an aluminum sheet, which is horizontally arranged. The calibration direction is the thickness direction of the cover plate body 1, that is, the direction indicated by the Z-axis. The cover plate body 1, the first insulating piece 2, and the riveting block 3 are sequentially arranged from bottom to top. The first insulating piece 2 is used for electrically isolating the cover plate body 1 and the riveting block 3 and can be made of PPS (Polyphenylene Sulfide) and glass fiber. The riveting block 3 can be made of pure aluminum and is used for riveting with the pole 4. The pole 4 can be a pure copper pole, a pure aluminum pole, a copper-aluminum composite pole, or a copper-aluminum friction welding pole and is used for transmitting battery current. The first sealing piece 5 can be made of a material with certain corrosion resistance and will not be corroded by the electrolyte.

[0028] In this embodiment, one end of the pole 4 passes through the sequentially arranged cover plate body 1, first insulating piece 2, and is connected with the riveting block 3 to assemble the battery cover plate. At the same time, the riveting block 3 is sealed and assembled with the first insulating piece 2 through the first sealing piece 5, and the pole 4 passes through the inside of the first sealing piece 5, so that the electrolyte overflowing from the liquid injection hole 12 of the cover plate body 1 cannot enter from the assembly gap between the first insulating piece 2 and the riveting block 3, that is, the pole 4 will not contact the electrolyte, which can effectively avoid the ion conduction between the pole 4 and the cover plate body 1, and thus a new flow path will not be formed, which will not damage the current distribution inside the shell, avoid shell voltage abnormalities, shell corrosion, liquid leakage, and other problems. In addition, when the riveting block 3 is riveted with the pole 4, the riveting pressure of the riveting block 3 is buffered by the first sealing piece 5 and then acts on the first insulating piece 2, which can effectively prevent the first insulating piece 2 from cracking.

[0029] As shown, Figure 2 Optionally, the first sealing piece 5 is a sealing compression ring.

[0030] In this embodiment, the first sealing piece 5 is a sealing compression ring, which saves material usage. The sealing compression ring can be arranged between the circumferential edge of the first insulating piece 2 and the circumferential edge of the riveting block 3. The cross-sectional shape of the sealing compression ring can be a rounded rectangle to match the shape of the first insulating piece 2 and the riveting block 3, so that the stress is more uniform and the sealing effect is better.

[0031] Of course, the first seal 5 can also be other structures, for example, the first seal 5 is a gasket for filling the gap between the first insulating member 2 and the riveting block 3.

[0032] As shown in Figures 2-4 Optionally, one side of the first insulating member 2 towards the riveting block 3 is provided with a mounting groove 21, and the riveting block 3 is provided with a mounting boss 31 matched with the mounting groove 21, the mounting boss 31 is used to pass through the first seal 5 to insert into the mounting groove 21, and the pole 4 is used to pass through the groove bottom of the mounting groove 21 to insert into the riveting block 3.

[0033] In this embodiment, the first insulating member 2 is provided with a mounting groove 21 with a notch upward, the shape of the mounting groove 21 is not limited, the riveting block 3 is provided with a mounting boss 31 downward protruding and matched with the mounting groove 21, that is, the riveting block 3 is in a stepped shape, when the mounting boss 31 is inserted into the mounting groove 21, the stepped surface of the riveting block 3 abuts the first seal 5 against the notch edge of the mounting groove 21 of the first insulating member 2, while realizing the positioning assembly of the first insulating member 2 and the riveting block 3, ensuring the assembly sealing property of the two. The groove bottom of the mounting groove 21 can be provided with two through holes for the positive and negative poles to pass through, since the first seal 5 is a compression ring arranged along the notch of the mounting groove 21, the pole passes through the mounting groove 21, that is, it can be ensured to pass through from the inside of the first seal 5.

[0034] Of course, the first seal 5 is not limited to the above setting mode, for example, the first seal 5 can also be a sealing ring arranged between the inner wall of the mounting groove 21 and the mounting boss 31.

[0035] Optionally, the compression rate of the first seal 5 is 25%-45%. By keeping the first seal 5 at a suitable compression amount, the sealing effect is ensured, avoiding the problems of accelerated wear, sealing failure due to too large compression amount of the first seal 5, and poor sealing and uneven stress due to too small compression amount. Exemplarily, the thickness of the first seal 5 before compression is 1.2mm, and the thickness after compression is 0.66-0.9mm.

[0036] As shown in Figures 1-2As shown, the battery cover plate further comprises a second insulation piece 6 and a second sealing piece 7. The second insulation piece 6 is arranged on the side of the cover plate body 1 away from the first insulation piece 2. The second sealing piece 7 is sleeved on the outer side of the pole 4. The second sealing piece 7 has a stepped structure, comprising a first sealing section 71 and a second sealing section 72 connected in sequence. The cover plate body 1 is provided with a first through hole 11 for the pole 4 to pass through. The second insulation piece 6 is provided with a second through hole 61 for the pole 4 to pass through. The second through hole 61 is in position correspondence with the first through hole 11. The first sealing section 71 is located between the pole 4 and the hole wall of the first through hole 11. The second sealing section 72 is located between the pole 4 and the hole wall of the second through hole 61.

[0037] In the embodiment, the second insulation piece 6 can be made of pp plastic (polypropylene). The second insulation piece 6 is located on the side of the cover plate body 1 away from the first insulation piece 2, i.e. below the cover plate body 1. The lower end of the pole 4 is connected with the tab connecting piece 8. The upper end of the pole 4 passes through the second insulation piece 6, the cover plate body 1, the first insulation piece 2 and the first sealing piece 5 in sequence to be riveted with the riveting block 3. The second insulation piece 6 can be used to support the cover plate body 1 and insulate the tab connecting piece 8 from the cover plate body 1.

[0038] In addition, the second sealing piece 7 can be an annular sealing ring, which is sleeved on the pole 4 and is assembled into the cover plate body 1 together with the pole 4. On the one hand, it can realize the insulation between the pole 4 and the cover plate body 1. On the other hand, it can realize the sealed connection between the pole 4 and the cover plate body 1, avoiding the infiltration of electrolyte into the assembly gap between the two.

[0039] Here, the second sealing piece 7 comprises a first sealing section 71 and a second sealing section 72 connected in sequence along the Z direction. The cross-sectional size of the first sealing section 71 is smaller than that of the second sealing section 72, so as to form a stepped structure with the upper part smaller and the lower part larger. The first through hole 11 on the cover plate body 1 and the second through hole 61 on the second insulation piece 6 are arranged in an upper-lower relationship. The cross-sectional size of the first through hole 11 is smaller than that of the second through hole 61. The first through hole 11 and the second through hole 61 are communicated, so as to form a stepped hole with the upper part smaller and the lower part larger. The shape of the second sealing piece 7 matches the shape of the stepped hole, i.e. the first sealing section 71 is located between the pole 4 and the hole wall of the first through hole 11, so as to realize the sealed assembly between the pole 4 and the cover plate body 1. The second sealing section 72 is located between the pole 4 and the hole wall of the second through hole 61, so as to realize the sealed assembly between the pole 4 and the second insulation piece 6.

[0040] In addition, the second sealing piece 7 has a stepped structure. The two parts are matched with the first through hole 11 and the second through hole 61 respectively, which can improve the positioning and assembly effect of the second sealing piece 7 and ensure the sealing performance.

[0041] Optionally, the first seal 5 and the second seal 7 are both made of fluororubber.

[0042] Optionally, the pole post 4 is provided with two, the two pole posts 4 are of the same polarity, and the two pole posts 4 are connected with the same riveting block 3. The two pole posts 4 can both be positive pole posts or both be negative pole posts, compared with a single pole post, the connection area of the pole post 4 with the inside of the battery can be increased, and the overcurrent capacity and working performance of the battery can be improved. Moreover, the two pole posts 4 are connected with the same riveting block 3, compared with that each pole post 4 is connected with a different riveting block 3, the strength of the riveting block 3 can be enhanced, and the reliability of the battery cover plate can be improved.

[0043] As shown in Figures 1-2 Optionally, the cover plate body 1 is provided with a liquid injection hole 12 at an end away from the pole post 4.

[0044] In the embodiment, the pole post 4 is assembled on the cover plate body 1, the liquid injection hole 12 is arranged on the cover plate body 1, the pole post 4 is arranged at one end close to the cover plate body 1, and the liquid injection hole 12 is arranged at the other end away from the pole post 4, that is, the liquid injection hole 12 is far away from the pole post 4. On the one hand, the liquid injection hole 12 can facilitate liquid injection, and on the other hand, the risk of electrolyte overflow and contact with the pole post 4 during injection can be reduced.

[0045] Specifically, the second insulating member 6 can be provided with a liquid leakage hole at a position corresponding to the liquid injection hole 12, and the electrolyte can enter the inside of the battery shell through the liquid injection hole 12 and the liquid leakage hole.

[0046] Another embodiment of the utility model provides a battery comprising the battery cover plate.

[0047] Optionally, the battery further comprises a battery body, the battery cover plate is provided with two, and the two are positive and negative battery cover plates respectively, and the positive and negative battery cover plates are arranged at two ends of the battery body along the length direction. The battery cover plate can be a blade lithium battery cover plate, the battery body is composed of an aluminum shell, a cell and the like, and the battery cover plate is installed in cooperation with the aluminum shell. The battery has the same advantages as the above-mentioned battery cover plate compared with the prior art, and will not be repeated.

[0048] Still another embodiment of the utility model provides a vehicle comprising the battery. The vehicle has the same advantages as the above-mentioned battery compared with the prior art, and will not be repeated.

[0049] Although the utility model discloses as above, the protection scope of the utility model is not limited to this only.The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will all fall into the protection scope of the utility model.

Claims

1. A battery cover plate, characterized by, The cover plate body (1), the first insulating piece (2), the riveting block (3), the pole (4) and the first sealing piece (5) are sequentially arranged along the reference direction, the first sealing piece (5) is arranged between the first insulating piece (2) and the riveting block (3), one end of the pole (4) sequentially passes through the cover plate body (1), the first insulating piece (2), the first sealing piece (5) and is connected with the riveting block (3).

2. The battery cover plate of claim 1, wherein, The first sealing piece (5) is a sealing compression ring.

3. The battery cover plate of claim 1, wherein, The first insulating piece (2) is provided with a mounting groove (21) on the side facing the riveting block (3), the riveting block (3) is provided with a mounting boss (31) matched with the mounting groove (21), the mounting boss (31) is used for penetrating the first sealing piece (5) to be inserted into the mounting groove (21), and the pole (4) is used for penetrating the groove bottom of the mounting groove (21) to be inserted into the riveting block (3).

4. The battery cover plate of claim 1, wherein, The compression rate of the first sealing piece (5) is 25%-45%.

5. The battery cover plate of claim 1, wherein, The second insulating piece (6) is arranged on the side of the cover plate body (1) away from the first insulating piece (2), the second sealing piece (7) is sleeved on the outside of the pole (4), the second sealing piece (7) has a stepped structure and comprises a first sealing section (71) and a second sealing section (72) connected in sequence, the cover plate body (1) is provided with a first through hole (11) through which the pole (4) passes, the second insulating piece (6) is provided with a second through hole (61) through which the pole (4) passes, the second through hole (61) is in position correspondence with the first through hole (11), the first sealing section (71) is located between the pole (4) and the hole wall of the first through hole (11), and the second sealing section (72) is located between the pole (4) and the hole wall of the second through hole (61).

6. The battery cover plate of claim 5, wherein, The first sealing piece (5) and the second sealing piece (7) are both made of fluororubber.

7. The battery cover plate of claim 1, wherein, The pole (4) is provided with two poles, the two poles have the same polarity, and the two poles are connected with the same riveting block (3).

8. The battery cover plate of claim 1, wherein, The cover plate body (1) is provided with a liquid injection hole (12) away from one end of the pole (4).

9. A battery, characterized by The battery cover plate comprises the battery cover plate according to any one of claims 1-8.

10. A vehicle characterized by comprising: The battery comprises the battery according to claim 9.

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