CN215911490U

CN215911490U - Battery core cover plate of power battery and power battery with same

Info

Publication number: CN215911490U
Application number: CN202122087122.7U
Authority: CN
Inventors: 姬嘉帅; 夏天军; 于东朋; 宁亚军; 祖春吉
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-02-25
Anticipated expiration: 2031-08-31

Abstract

The utility model discloses a battery core cover plate of a power battery and the power battery with the same, wherein the battery core cover plate comprises: the cover plate comprises a cover plate body, wherein the cover plate body is provided with a mounting hole, and a turned edge is arranged at the edge of the mounting hole; the pole column penetrates through the mounting hole; the first sealing element is arranged between the cover plate body and the pole; a second seal interference fit between the bead and the post. According to the battery core cover plate of the power battery, double sealing and effective insulation between the pole and the cover plate body are realized through the matching of the turned edge, the first sealing element and the second sealing element, the number of parts is small, the height of the pole can be smaller, the cost is reduced, the weight is lightened, and the energy density of a battery core is improved.

Description

Battery core cover plate of power battery and power battery with same

Technical Field

The utility model relates to the technical field of power batteries, in particular to a battery core cover plate of a power battery and the power battery with the battery core cover plate.

Background

Power batteries, such as lithium ion batteries, are increasingly used in various fields. For example, the energy of lithium ion batteries (lithium ion batteries and lithium high polymer batteries) with the same mass is 4-6 times that of lead-acid batteries and 2-3 times that of nickel-hydrogen batteries. The main raw material of the lithium ion battery is lithium, the lithium ore resources in China are rich, and the total detected lithium reserves are the second in the world; lithium ions are also present in seawater and can be extracted from seawater by solar energy in the future. In addition, the lithium ion battery has the potential of recycling, and the problem of the requirement on raw materials can be solved. The price of the final lithium ion battery decreases after large-scale commercialization. Therefore, lithium ion batteries are increasingly used as power batteries for electric vehicles.

However, in the related art, the cover plate assembly of the power battery mainly adopts a riveting manner, so that the number of parts is large, the weight is large, the height of the pole is high, the cost is high, and the airtight protection is not facilitated.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides the battery core cover plate of the power battery, which has the advantages of few parts, light weight, low cost and good air tightness.

The utility model also provides a power battery with the battery core cover plate.

According to the cell cover plate of the power battery provided by the embodiment of the utility model, the cell cover plate comprises: the cover plate comprises a cover plate body, wherein the cover plate body is provided with a mounting hole, and a turned edge is arranged at the edge of the mounting hole; the pole column penetrates through the mounting hole; the first sealing element is arranged between the cover plate body and the pole; a second seal interference fit between the bead and the post.

According to the battery core cover plate of the power battery, double sealing and effective insulation between the pole and the cover plate body are realized through the matching of the turned edge, the first sealing element and the second sealing element, the number of parts is small, the height of the pole can be smaller, the cost is reduced, the weight is lightened, and the energy density of a battery core is improved.

In addition, the cell cover plate of the power battery according to the above embodiment of the present invention may further have the following additional technical features:

according to some embodiments of the utility model, the edge of the mounting hole is provided with a sealing convex part protruding inwards, the outer circumferential surface of the pole is provided with a positioning convex part, the first sealing member comprises at least one of a first end sealing part and a first side sealing part, wherein the first end sealing part is arranged between the positioning convex part and the sealing convex part; the first side sealing portion is disposed between the sealing convex portion and the outer peripheral surface of the pole.

According to some embodiments of the utility model, at least one of the first end seal portion and the first side seal portion is interference fit between the sealing boss and the pole.

According to some embodiments of the utility model, the outer circumferential surface of the pole is provided with a positioning projection, and the second seal member comprises a second side seal portion provided between the bead and the outer circumferential surface of the pole.

According to some embodiments of the utility model, the second seal member includes a second end seal portion connected to the second side seal portion and disposed between the locating tab and the bead.

According to some embodiments of the utility model, the second seal includes an outer insulating portion connected to the second side sealing portion and wrapping around a side of the bead facing away from the locating tab.

According to some embodiments of the utility model, an interference of the second seal with the pole post and the crimp is greater than or equal to 30%.

According to some embodiments of the utility model, the edge of the mounting hole is provided with a sealing convex part protruding inwards, the outer circumferential surface of the pole is provided with a positioning convex part, the outer circumferential edge of the positioning convex part is provided with an encapsulating layer, one of the encapsulating layer and the sealing convex part is provided with a groove, and the other one of the encapsulating layer and the sealing convex part is provided with a protrusion extending into the groove.

According to some embodiments of the utility model, the cover plate body is a single piece.

The power battery provided by the embodiment of the utility model comprises the cell cover plate of the power battery provided by the embodiment of the utility model.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a cell cover plate according to an embodiment of the present invention;

fig. 2 is a top view of a cell cover plate according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is an enlarged schematic view of FIG. 3 at circle B;

fig. 5 is an exploded view of a cell cover plate according to an embodiment of the present invention;

fig. 6 is a partial structural schematic diagram of a cell cover plate according to an embodiment of the present invention;

fig. 7 is a second seal without deformation processing according to an embodiment of the present invention.

Reference numerals:

a cell cover plate 100;

a cover plate body 10; a mounting hole 11; a sealing protrusion 12; a crimping edge 13; a groove 14;

a pole 20; a positioning projection 21; an encapsulating layer 22; a projection 23;

a first seal member 30; a first end seal portion 31; a first side seal 32;

a second seal member 40; a second side seal 41; a second end seal 42; an outer insulating portion 43;

an explosion-proof valve 50; a patch 51; a lower plastic 60.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

In the description of the present invention, "a first feature" or "a second feature" may include one or more of the features, and "a plurality" means two or more, and the first feature may be "on" or "under" the second feature, and may include the first and second features being in direct contact, or may include the first and second features being not in direct contact but being in contact with another feature therebetween, and the first feature being "on", "above" and "above" the second feature may include the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is higher in level than the second feature.

A cell cover 100 of a power battery according to an embodiment of the present invention is described below with reference to the accompanying drawings.

Referring to fig. 1 to 5, a cell cover plate 100 of a power battery according to an embodiment of the present invention may include: a cover plate body 10, a pole 20, a first seal 30 and a second seal 40.

Specifically, the cover plate body 10 (e.g., a plain aluminum sheet) has a mounting hole 11, and an edge (e.g., an upper end edge shown in fig. 4) of the mounting hole 11 is provided with a curled edge 13, and the curled edge 13 is formed by subjecting a plate body provided at the edge of the mounting hole 11 to a crimping deformation. The pole post 20 is arranged in the mounting hole 11 in a penetrating mode, the first sealing element 30 is arranged between the cover plate body 10 and the pole post 20, and the second sealing element 40 is in interference fit between the turned edge 13 and the pole post 20.

For example, in some embodiments, the edge of the mounting hole 11 (e.g., the lower edge shown in fig. 4) is provided with a sealing protrusion 12, the sealing protrusion 12 protrudes inward of the mounting hole 11, and a first seal 30 may be provided between the sealing protrusion 12 and the pole 20 to achieve sealing.

Realize the dual seal between utmost point post 20 and the apron body 10 through first sealing member 30 and second sealing member 40, reach effectual airtight guard action, and can carry out insulation protection to utmost point post 20 and apron body 10. In addition, the number of parts required for assembling the pole 20 is small, the pole 20 does not need to be provided with a high height, and the cost of the battery cell cover plate 100 is favorably reduced, so that the cost of the battery cell is reduced, the weight of the battery cell cover plate 100 can be effectively reduced, and the overall energy density of the battery cell is effectively improved. For example, in some embodiments, the two end surfaces of the pole 20 may be flush with the opposing surfaces of the first and

second seals

30 and 40, respectively, or the two ends of the pole 20 may extend beyond a small distance.

In the assembling process, the first sealing element 30 may be sleeved on the lower end of the pole 20, and then the pole 20 is installed in the installation hole 11, so that the first sealing element 30 is in contact fit with the cover plate body 10, for example, supported by the sealing convex portion 12; then sleeving the second sealing element 40 on the upper end of the pole 20; the cover plate body 10 is then crimped to form the crimp 13, so that the crimp 13 presses the second sealing member 40, and in some embodiments, the first sealing member 30 may also be indirectly pressed, so as to achieve interference mounting of the first sealing member 30 and the second sealing member 40, and achieve an excellent air-tight protection effect.

In some embodiments of the utility model, the closure body 10 may be a unitary piece. In other words, the cover plate body 10, the bead 13 and the sealing convex portion 12 are an integral piece, operations such as welding are not required, the assembling process is simple, the structural reliability is high, and an interference fit structure is easily realized to ensure an airtight protection effect.

According to the cell cover plate 100 of the power battery, the crimping 13, the first sealing element 30 and the second sealing element 40 are matched, so that double sealing and effective insulation between the pole 20 and the cover plate body 10 are achieved, the number of parts is small, the height of the pole 20 can be smaller, the cost is reduced, the weight is reduced, and the energy density of a cell is improved.

The structure and mounting structure of the first and

second seals

30 and 40 according to some embodiments of the present invention will be described below with reference to the accompanying drawings.

According to some embodiments of the present invention, as shown in fig. 4 to 6, the edge of the mounting hole 11 is provided with a sealing convex portion 12 protruding inward, the outer circumferential surface of the pole 20 is provided with a positioning convex portion 21, the first sealing member 30 includes at least one of a first end sealing portion 31 and a first side sealing portion 32, the first end sealing portion 31 is provided between the positioning convex portion 21 and the sealing convex portion 12 to achieve sealing between the positioning convex portion 21 and the sealing convex portion 12; the first side sealing portion 32 is provided between the sealing projection 12 and the outer circumferential surface of the pole 20 to effect a seal between the sealing projection 12 and the outer circumferential surface of the pole 20. In some embodiments, the sealing bead 12 may be located on the underside of the bead 13, with the sealing bead 12 being spaced a distance from the bead 13 such that the locating bead 21 may be located between the bead 13 and the sealing bead 12.

In some embodiments including both the first end sealing portion 31 and the first side sealing portion 32, the first side sealing portion 32 is connected to the first end sealing portion 31, so that the cross section of the first sealing member 30 is substantially formed in an L shape, the structural stability of the first sealing member 30 is stronger, and the first sealing member is not easily distorted and deformed during the assembly process to affect the sealing effect.

In some embodiments, at least one of the first end seal portion 31 and the first side seal portion 32 is interference fit between the seal projection 12 and the pole post 20 to further enhance the sealing effect. For example, in some embodiments, after the cover body 10 is deformed to form the bead 13, the bead 13 may press the positioning protrusion 21, so that the positioning protrusion 21 presses the first end sealing portion 31, thereby achieving the interference fit of the first end sealing portion 31 and achieving the sealing and insulating effects of the first sealing member 30.

It should be noted that in some embodiments including both the first end seal 31 and the first side seal 32, one of the first end seal 31 and the first side seal 32 may be in sealing engagement and the other may be in sealing engagement or spaced apart from the engaged components by a gap. Wherein, sealed cooperation can increase sealing area, improves airtight protection effect, and it is easier that utmost point post 20 is located to spaced apart setting then first sealing member 30 cover, assembles simplyr.

According to some embodiments of the utility model, as shown in fig. 4-7, the outer circumferential surface of the pole 20 is provided with a positioning projection 21, and the second sealing member 40 comprises a second side sealing portion 41, the second side sealing portion 41 being provided between the bead 13 and the outer circumferential surface of the pole 20 to achieve sealing between the bead 13 and the outer circumferential surface of the pole 20. After the cap body 10 is subjected to the crimping deformation to form the bead 13, the bead 13 may press the second side sealing part 41 to improve the sealing effect.

In some embodiments, as shown in fig. 4, the second sealing member 40 may include a second end sealing portion 42, and the second end sealing portion 42 is connected to the second side sealing portion 41, so that the cross sections of the second end sealing portion 42 and the second side sealing portion 41 are substantially L-shaped, and the second sealing member 40 is prevented from being distorted or dislocated during the pressing process of the bead 13 to affect the sealing effect. Also, a second end sealing portion 42 may be provided between the positioning boss 21 and the bead 13 to increase a sealing area and an insulation range.

In some embodiments, the second end seal 42 may be an interference fit between the locating boss 21 and the bead 13 to further enhance the sealing effect.

In some embodiments, as shown in fig. 4, the second sealing element 40 includes an outer insulating portion 43, the outer insulating portion 43 is connected to the second side sealing portion 41, and the outer insulating portion 43 covers a side (e.g., an upper side shown in fig. 4) of the turned edge 13 facing away from the positioning protrusion 21, so that on one hand, an insulating range can be increased, and on the other hand, a position-limiting effect of the second sealing element 40 can be improved, so that the second sealing element 40 is not easily torn or dropped, and the appearance is beautiful.

In the manufacturing process, the outer insulating portion 43 may be formed by performing a hot-melting process on the upper portion of the second sealing member 40, so that the second sealing member 40 can more closely cover the bead 13, reduce a gap between the outer insulating portion 43 and the bead 13, and be formed in any desired shape.

In some embodiments, the interference between the second sealing member 40 and the pole 20 and between the second sealing member 40 and the bead 13 is greater than or equal to 30% to ensure the sealing effect. Specifically, as shown in fig. 7, before the extrusion deformation, the thickness of the second sealing member 40 is L1, and as shown in fig. 4, after the assembly is completed, the distance between the bead 13 and the outer peripheral surface of the pole 20 is L2, and the distance between the bead 13 and the positioning protrusion 21 is L3, wherein (L1-L2)/L1 is greater than or equal to 30%, (L1-L3)/L1 is greater than or equal to 30%.

In some embodiments, at least one of the inner surface and the outer surface of the second sealing member 40 may be provided with a sealing rib, and the sealing rib may increase the deformation amount of the second sealing member 40, thereby enhancing the sealing property.

In the embodiment of the present invention, the second sealing member 40 includes but is not limited to PP (polypropylene), and it is only necessary to satisfy the requirement that the second sealing member 40 can be extruded and deformed to achieve sealing.

According to some embodiments of the present invention, as shown in fig. 4 and 6, the outer circumferential surface of the pole 20 is provided with a positioning protrusion 21, the outer circumferential edge of the positioning protrusion 21 is provided with an encapsulating layer 22, and the encapsulating layer 22 can be formed by performing an injection molding and encapsulating process on the positioning protrusion 21. The encapsulating layer 22 can separate the positioning convex part 21 from the hole wall of the mounting hole 11, so that an insulating effect is realized.

In some embodiments, the two ends of the encapsulating layer 22 are respectively in contact fit with the first sealing element 30 and the second sealing element 40, so that the first sealing element 30, the encapsulating layer 22 and the second sealing element 40 are fitted to completely separate the pole 20 from the cover plate body 10, and the insulating effect is better.

In some embodiments, as shown in fig. 4 and 6, one of the encapsulating layer 22 and the sealing convex portion 12 is provided with a groove 14, and the other of the encapsulating layer 22 and the sealing convex portion 12 is provided with a protrusion 23, and the protrusion 23 extends into the groove 14 to prevent the pole 20 from rotating in the mounting hole 11, so that a reliable positioning effect is achieved, and the positioning structure is simple.

In some embodiments, there may be at least one groove 14, and the protrusions 23 may be disposed in one-to-one correspondence with the grooves 14.

In the embodiment of the present invention, the encapsulating layer 22 includes but is not limited to PPS (plastic), and only needs to satisfy the requirement of achieving insulation and reliable rotation prevention.

The structure and assembly of the cell cover plate 100 according to some embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in fig. 1 to 7, the battery cell cover plate 100 includes a cover plate body 10, a lower plastic 60, a pole 20, a first sealing element 30, a second sealing element 40, an encapsulating layer 22, an explosion-proof valve 50, and a patch 51. The number of the two poles 20 is positive pole 20 and negative pole 20, and each pole 20 is correspondingly provided with a first sealing element 30, a second sealing element 40 and an encapsulating layer 22. The first sealing element 30 is made of PP, and the encapsulating layer 22 is made of PPs.

The lower plastic 60 is disposed at the lower side of the cover body 10. The cover plate body 10 is a smooth aluminum sheet and is provided with two mounting holes 11 for respectively mounting the positive pole post 20 and the negative pole post 20, and a through hole for mounting the explosion-proof valve 50, and the patch 51 is iron arranged on the upper surface of the explosion-proof valve 50. The lower end edge of each mounting hole 11 is provided with an inward protruding sealing convex part 12, the sealing convex part 12 is provided with a groove 14, and the upper end edge of each mounting hole 11 is provided with an annular plate body. As shown in fig. 7, the second sealing member 40, which has not been subjected to the deformation process (e.g., press deformation and heat-melt deformation), has a substantially L-shaped cross section and includes an annular portion, which may serve as the second end sealing portion 42, and a cylindrical portion, which may be formed as the second side sealing portion 41 and the outer insulating portion 43 after the deformation process.

During assembly, firstly, an encapsulating layer 22 is formed on the outer periphery of the positioning convex part 21 of the pole 20 through encapsulation treatment, the first sealing element 30 is sleeved on the lower part of the pole 20, and the first end sealing part 31 is abutted against the positioning convex part 21; then, the pole 20 is inserted into the mounting hole 11, and the first end sealing part 31 is abutted against the sealing convex part 12; then, sleeving the second sealing member 40 which is not deformed on the upper part of the pole 20, and enabling the second end sealing part 42 to be abutted against the positioning convex part 21; then, the annular plate body of the lid body 10 is subjected to a crimping deformation process to form a bead 13, a lower surface of the bead 13 presses the second end sealing portion 42 to achieve an interference fit of the second end sealing portion 42 and an interference fit of the first end sealing portion 31, and an inner peripheral surface of the bead 13 presses the cylindrical portion of the second sealing member 40 to achieve an interference fit of the cylindrical portion; the upper portion of the cylindrical portion, which is formed as the second side sealing portion 41 and the outer insulating portion 43 as shown in fig. 4, is then subjected to a heat-melting process, so that the upper portion of the cylindrical portion is deformed outward and covers the upper surface of the bead 13.

The power battery according to the embodiment of the utility model comprises the cell cover plate 100 of the power battery according to the embodiment of the utility model. Because the cell cover plate 100 of the power battery according to the embodiment of the present invention has the above beneficial technical effects, the power battery according to the embodiment of the present invention realizes double sealing and effective insulation between the terminal post 20 and the cover plate body 10 by matching the curled edge 13, the sealing protrusion 12, the first sealing member 30 and the second sealing member 40, and has a small number of parts, and the height of the terminal post 20 can be smaller, which is beneficial to reducing the cost, reducing the weight, and improving the energy density of the cell.

Other constructions and operations of the power battery and the cell cover plate 100 according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the terms "embodiment," "particular embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A cell cover plate (100) of a power battery, comprising:

the cover plate comprises a cover plate body (10), wherein the cover plate body (10) is provided with a mounting hole (11), and a curled edge (13) is arranged at the edge of the mounting hole (11);

the pole post (20), the pole post (20) is arranged in the mounting hole (11) in a penetrating mode;

a first seal (30), the first seal (30) being provided between the cover plate body (10) and the pole (20);

a second seal (40), the second seal (40) being an interference fit between the crimp (13) and the pole (20).

2. The cell cover plate (100) of a power battery according to claim 1, wherein the edge of the mounting hole (11) is provided with an inwardly protruding sealing protrusion (12), the outer circumferential surface of the pole (20) is provided with a positioning protrusion (21), the first sealing member (30) comprises at least one of a first end sealing portion (31) and a first side sealing portion (32), wherein,

the first end seal portion (31) is provided between the positioning convex portion (21) and the sealing convex portion (12);

the first side sealing part (32) is provided between the sealing projection (12) and the outer peripheral surface of the pole (20).

3. The cell cover plate (100) of a power battery according to claim 2, characterized in that at least one of the first end seal portion (31) and the first side seal portion (32) is interference fitted between the sealing protrusion (12) and the pole (20).

4. The cell cover plate (100) of the power battery according to claim 1, wherein the outer circumferential surface of the pole (20) is provided with a positioning protrusion (21), and the second sealing member (40) comprises a second side sealing part (41), and the second side sealing part (41) is arranged between the curled edge (13) and the outer circumferential surface of the pole (20).

5. The cell cover plate (100) of a power battery according to claim 4, wherein the second sealing member (40) comprises a second end sealing portion (42), and the second end sealing portion (42) is connected to the second side sealing portion (41) and is disposed between the positioning protrusion (21) and the bead (13).

6. The cell cover plate (100) of the power battery according to claim 4, wherein the second sealing member (40) comprises an outer insulating portion (43), and the outer insulating portion (43) is connected with the second side sealing portion (41) and covers a side of the crimping edge (13) facing away from the positioning protrusion (21).

7. The cell cover plate (100) of the power battery according to claim 1, wherein an interference of the second seal (40) with the pole (20) and the crimp (13) is greater than or equal to 30%.

8. The battery core cover plate (100) of the power battery according to claim 1, wherein the edge of the mounting hole (11) is provided with a sealing convex portion (12) protruding inwards, the outer circumferential surface of the pole (20) is provided with a positioning convex portion (21), the outer circumferential edge of the positioning convex portion (21) is provided with an encapsulating layer (22), one of the encapsulating layer (22) and the sealing convex portion (12) is provided with a groove (14), and the other one of the encapsulating layer (22) and the sealing convex portion (12) is provided with a protrusion (23) extending into the groove (14).

9. The cell cover plate (100) of a power battery according to any one of claims 1-8, wherein the cover plate body (10) is one-piece.

10. A power battery, characterized by comprising a cell cover plate (100) of the power battery according to any one of claims 1-9.