CN216450784U

CN216450784U - Top cover assembly and power battery

Info

Publication number: CN216450784U
Application number: CN202123060954.6U
Authority: CN
Inventors: 王有生; 覃太平; 李华; 夏春文
Original assignee: Changzhou Red Fairy Precision Technology Co Ltd
Current assignee: Changzhou Red Fairy Precision Technology Co Ltd
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2022-05-06
Anticipated expiration: 2031-12-07

Abstract

The application provides a top cap subassembly and power battery. The pole block is provided with a first connecting part and a second connecting part which can be connected with an external circuit or a Busbar and the like, and the first connecting part and the second connecting part are respectively provided with a first fusing part and a second fusing part; the cross-sectional area of the first fusing part is not smaller than that of the second fusing part, namely the second fusing part is easier to fuse than the first fusing part. The user can connect the external circuit or the Busbar to the second connecting part firstly; when the current is excessive, the second fusing part fuses. Then, the user can also connect an external circuit or a Busbar and the like to the first connecting part again, and the first fusing part can also protect a pole or a power battery and the like; on the basis of guaranteeing top cap subassembly safety in utilization, further improved top cap subassembly's life and reliability, and top cap subassembly's maintainability is better.

Description

Top cover assembly and power battery

Technical Field

The application relates to the technical field of power batteries, in particular to a top cover assembly and a power battery.

Background

With the increasing maturity of lithium ion battery technology, lithium ion batteries are widely used in the fields of electric vehicles and energy storage as power batteries, and the requirements on the service performance and safety of the lithium ion batteries are increasing. In order to improve the safety of the power battery, a fusing structure is usually arranged on the power battery, and when the power battery is overcharged and the like, the fusing structure is fused to prevent the power battery from being exploded and the like.

In the prior art, a power battery can be connected with an external circuit or a bus bar to be connected with more power batteries in parallel; in order to protect the power battery, a fusing structure is also usually arranged on the pole block of the top cover of the power battery.

But the service life of the external pole block fusing structure is limited; when a large amount of power batteries are connected through the Busbar, the fusing of one fusing structure easily causes disconnection of more power batteries, the power batteries after the fusing structure fails are inconvenient to replace, and the reliability and maintainability of the power batteries are poor.

SUMMERY OF THE UTILITY MODEL

The application provides a top cap subassembly and power battery to the relatively poor technical problem of top cap subassembly maintainability among the solution prior art.

In one aspect, the present application provides a header assembly comprising:

the pole column, the pole block, the upper plastic and the cover plate with the pole column hole;

the pole is arranged in the pole hole and connected with the pole block, the pole block is arranged on one side of the cover plate, and the upper plastic is arranged between the upper pole and the cover plate;

the pole block comprises a first connecting part with a first fusing part, a second connecting part with a second fusing part and a pole body;

the pole body is connected with the pole post, the first connecting portion is connected with the pole body through the first fusing portion, the second connecting portion is connected with the first connecting portion or the pole body through the second fusing portion, and the cross sectional area of the first fusing portion is not smaller than that of the second fusing portion.

In this application, in a possible implementation manner, the first connecting portion surrounds the pole body, the first fusing portion is circular ring shaped, and the second connecting portion passes through the second fusing portion is connected to the first connecting portion.

In one possible implementation of the present application, the first fuse portion includes a through hole section and a connection section.

In one possible implementation manner of the present application, the first fusing part includes a plurality of connection segments arranged at intervals.

In one possible implementation manner of the present application, the connection segment includes a first region and a second region, and a cross-sectional area of the first region is not smaller than a cross-sectional area of the second region.

In one possible implementation manner of the present application, the second connection portion connects the pole body through the second fusing portion.

In one possible implementation manner of the present application, the second fusing portion is detachably connected to the first connecting portion or the pole body.

In one possible implementation manner of the present application, the first fuse portion and/or the second fuse portion has a notch.

In a possible implementation manner of the present application, on an orthographic projection of a plane where the cover plate is located, an area of the first connection portion is not larger than an area of the second connection portion.

In another aspect, the present application also provides a power battery including the top cap assembly as described above.

The application provides a pair of top cap subassembly and power battery includes: the pole column, the pole block, the upper plastic and the cover plate with the pole column hole; the pole is arranged in the pole hole; the pole block is arranged on one side of the cover plate and comprises a pole body, a first connecting part with a first fusing part and a second connecting part with a second fusing part; the pole body is connected with the pole, the first connecting part is connected with the pole body through the first fusing part, the second connecting part is connected with the first connecting part or the pole body through the second fusing part, and the cross sectional area of the first fusing part is not smaller than that of the second fusing part; the upper plastic is arranged between the pole block and the cover plate. The first connection part and the second connection part which can be connected with an external circuit or a Busbar and the like are arranged on the pole block, and the first fusing part and the second fusing part are respectively arranged on the first connection part and the second connection part; wherein a cross-sectional area of the first fusing part is not less than a cross-sectional area of the second fusing part, i.e., the second fusing part fuses more easily than the first fusing part. The user can connect an external circuit or a Busbar to the second connecting part firstly; when the current is excessive, the second fusing part fuses. Then, the user can connect an external circuit or a Busbar and the like to the first connecting part again, and the first fusing part can protect the pole, the power battery and the like; on the basis of guaranteeing top cap subassembly safety in utilization, further improved top cap subassembly's life and reliability, just top cap subassembly's maintainability is better.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of a cap assembly according to an embodiment of the present disclosure;

fig. 2 is an exploded view of a cap assembly provided by an embodiment of the present application;

FIG. 3 is an enlarged schematic view at E in FIG. 2;

FIG. 4 is a top view of a pole piece provided by an embodiment of the present application;

FIG. 5 is a cross-sectional view taken at D-D of FIG. 4;

FIG. 6 is an enlarged schematic view at K of FIG. 5;

FIG. 7 is another top view of a pole piece provided by an embodiment of the present application;

FIG. 8 is a cross-sectional view taken at F-F of FIG. 7;

fig. 9 is an enlarged schematic view at H in fig. 8.

Reference numerals:

the top cap subassembly 100, utmost point post 200, positive post 210, negative pole post 220, utmost point piece 300, first connecting portion 310, second connecting portion 320, first fusing portion 330, through-hole section 331, connecting segment 332, second fusing portion 340, utmost point body 350, breach 360, go up plastic 400, apron 500, utmost point post hole 510, annotate liquid hole 520, sealing washer 600, lower plastic 700, upset piece 800, explosion-proof piece 900.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to 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; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1 to 6, an embodiment of the present application provides a cap assembly 100, including: the pole comprises a pole 200, a pole block 300, upper plastic 400 and a cover plate 500 provided with a pole hole 510; the pole is arranged in the pole hole; the pole block 300 is disposed at one side of the cap plate 500, and the pole block 300 includes a pole body 350, a first connection portion 310 having a first fuse portion 330, and a second connection portion 320 having a second fuse portion 340; the pole body 350 is connected with the pole post 200, the first connecting portion 310 is connected with the pole body 350 through the first fusing portion 330, the second connecting portion 320 is connected with the first connecting portion 310 or the pole body 350 through the second fusing portion 340, and the cross-sectional area of the first fusing portion 330 is not smaller than that of the second fusing portion 340; the upper plastic 400 is disposed between the pole piece 300 and the cover plate 500.

When a current flows through a conductor, the conductor generates heat because of a certain resistance of the conductor. It is known that the greater the current in a conductor, the greater the heat generated by the conductor; and along with the long-time large current passing through the conductor, the heat generated by the conductor is accumulated, and the conductor is further promoted to be heated; finally, when the temperature of the conductor reaches the melting point temperature of the substance, the conductor will fuse, and current cannot pass through the conductor to cut off the circuit.

In addition, the temperature rise speed of the conductor is also related to the specific heat capacity and the mass of the conductor. Illustratively, in the embodiment of the present application, the cross-sectional area of each of the first connection portion 310 and the second connection portion 320 is larger than the cross-sectional areas of the first fuse portion 330 and the second fuse portion 340. In the case of the same unit length and the same material, that is, in the case of the same specific heat capacity of each part of the pole block 300, the mass of each of the first connection part 310 and the second connection part 320 is greater than the mass of each of the first fusing part 330 and the second fusing part 340; therefore, the temperature of the first and

second fusing parts

330 and 340 is much faster than that of the first and second connecting

parts

310 and 320 when current passes through the pole piece 300 in the same time. Therefore, when a large current passes through the pole piece 300, the first fusing part 330 and the second fusing part 340 are more easily fused than the first connecting part 310 or the second connecting part 320. In addition, the cross-sectional area of the first fuse portion 330 is not smaller than that of the second fuse portion 340, that is, the first fuse portion 330 is thicker than the second fuse portion 340, and the second fuse portion 340 is easier to fuse than the first fuse portion 330.

It should be noted that the cap assembly 100 provided in the embodiments of the present application can be used for a square-casing power battery (not shown). The top cover assembly 100 is mounted on the housing, and the pole block 300 is disposed on one side of the cover plate 500 away from the housing, that is, the first connecting portion 310 and the second connecting portion 320 are exposed outside the power battery, and may be used to connect an external circuit or a buss bar to connect more power batteries in parallel.

By providing the first and

second connection parts

310 and 320 to which an external circuit or a Busbar, etc. can be connected on the pole piece 300, and providing the first and

second fusing parts

330 and 340 for the first and

second connection parts

310 and 320, respectively; the cross-sectional area of the first fuse portion 330 is not smaller than that of the second fuse portion 340, that is, the second fuse portion 340 is easier to fuse than the first fuse portion 330. A user may connect an external circuit or a Busbar to the second connection portion 320 first; when the current is excessive, the second fusing part 340 is fused. Then, the user may further connect an external circuit or a Busbar to the first connection portion 310 again, and the first fusing portion 330 may further protect the pole 200 or the power battery, etc.; on the basis of ensuring the use safety of the top cover assembly 100, the service life of the top cover assembly 100 is further prolonged.

Specifically, go up plastic 400 and adopt injection moulding, go up plastic 400 and avoided utmost point piece 300 with the electricity of apron 500 is connected, has guaranteed top cap assembly 100's security and reliability, just top cap assembly 100's maintainability is better.

Specifically, the second fusing part 340 and the first fusing partThe cross-sectional area of the fusing part 330 is 0.5mm²-10mm²。

Specifically, the pole block 300 is connected to the pole 200, which may be a positive pole 210.

In some embodiments, the first connection portion 310 is disposed around the pole body 350, the first fuse portion 330 has a circular ring shape, and the second connection portion 320 is connected to the first connection portion 310 through the second fuse portion 340.

It should be noted that the pole 200 is generally cylindrical, and the pole body 350 is sleeved on the pole 200, so as to fixedly connect the pole block 300 and the pole 200.

The first fusing part 330 is arranged in a ring shape matched with the pole body 350, and the first fusing part 330 with a circular structure has better bearing capacity, so that the structural strength of the pole block 300 can be improved.

The second connection part 320 is connected to the first connection part 310 through the second fuse part 340, and then connected to the pole body 350 through the first fuse part 330; namely, the second connection part 320, the first connection part 310 and the pole body 350 are sequentially connected in series. The second fusing part 340 is more easily fused than the first fusing part 330; it can be ensured that when the second connection portion 320 is first connected to an external circuit or a Busbar, etc., the second connection portion 320 may be disconnected from the pole 200 due to an excessive current; then, the first connection portion 310 is connected to an external circuit or a Busbar, and the first connection portion 310 may be disconnected from the pole post 200 due to an excessive current. The reliability of the reuse of the pole piece 300 is improved.

In some embodiments, the first fuse portion 330 includes a through hole section 331 and a connection section 332.

As can be seen from the above description, the temperature rising speed of the first fuse portion 330 is related to the specific heat capacity and mass thereof. When the first fuse portion 330 includes a through hole section 331 and a connection section 332, that is, there is a through hole between the pole body 350 and the first connection portion 310, that is, the arc length of the first fuse portion 330 is smaller than the length of the pole body 350. The first fuse portion 330 is not fused by the same current. The thickness, i.e., the cross-sectional area, of the first fusing part 330 may be increased. Thereby improving the connection strength between the pole body 350 and the first connection part 310 and extending the service life of the pole block 300.

In some embodiments, the first fuse portion 330 includes a plurality of connection segments 332 arranged at intervals.

Preferably, the first fuse portion 330 includes four connecting segments 332.

By providing four through-connecting sections 332 on the first fuse part 330, that is, four through-hole sections 331 spaced apart from each other on the first fuse part 330; four thicker connecting sections 332 are arranged between the pole body 350 and the first connecting portion 310, and the stress and current of the first connecting portion 310 can be uniformly transmitted to the pole body 350, so that the structural strength of the pole block 300 is improved.

Further, in other embodiments, the first fuse portion 330 may further include three connecting segments 332 or five connecting segments 332, which is not limited herein.

Preferably, a plurality of the connection segments 332 are symmetrically arranged.

The symmetrically arranged connection segments 332 may improve the structural stability of the pole piece 300.

Further, in other embodiments, the plurality of connecting segments 332 may be disposed asymmetrically, and is not limited herein.

Preferably, the upper plastic 400 is partially filled in the through hole section 331; and the part of the upper plastic 400 filled in the through hole section 331 does not extend to the outside of the through hole section 331, i.e. the surface of the outside of the through hole section 331 is smooth, which improves the surface flatness of the top cover assembly.

In some embodiments, the arc length of the via segment 331 is a and the arc length of the connecting segment 332 is B, wherein a and B satisfy: b is more than or equal to 0.5A and less than or equal to 2A.

Thus, the structure of the pole piece 300 is more stable.

Further, in other embodiments, a and B may also satisfy: 0.3A < B < 0.5A, or 2A < B < 3A, etc., without being limited thereto.

In some embodiments, the connecting segment 332 includes a first region (not shown) and a second region (not shown), the first region having a cross-sectional area that is not less than the cross-sectional area of the second region.

It is understood that the cross-sectional area of the first region is not smaller than that of the second region, which is more easily fused than the first region.

When the first connection portion 310 is connected to an external circuit or a Busbar, the first fuse portion 330 will first fuse from the second region and then fuse the first region; fusing of first fusing portion 330 is more stable orderly, can reduce fusing impurity's production, just fusing face of first fusing portion 330 is more regular, is convenient for maintenance personal to take off utmost point piece 300 is in order to maintain top cap subassembly 100.

Referring to fig. 1 to 3, and 7 to 9, in some embodiments, the second connection portion 320 is connected to the pole body 350 through the second fuse portion 340.

That is, the second connection portion 320 is not connected to the first connection portion 310, and the first connection portion 310 is connected to the second connection portion 320 in parallel. The first fusing part 330 and the second fusing part 340 can be prevented from being fused at one time by a large current, and the reusability of the pole block 300 can be improved.

In some embodiments, the second fuse portion 340 is detachably connected to the first connection portion 310 or the pole body 350.

It can be understood that, since the second fusing part 340 may be easier to fuse than the first fusing part 330, a user may first connect the second connecting part 320 to an external circuit, a Busbar, or the like; when the second fusing part 340 is fused, the fused second fusing part 340 is detached, and a new second fusing part 340 is replaced, so that the second connecting part 320 can be used continuously. It is possible to prevent a user from transferring an external circuit, a Busbar, or the like to the first connection portion 310 and to improve the reliability of the pole piece 300 by using the first connection portion 310 as a spare connection portion.

Further, in other embodiments, the second fuse portion 340 and the first connection portion 310 or the pole body 350 may also be fixedly connected; such as welding, or bonding, etc., and are not intended to be limiting.

In some embodiments, the first fuse portion 330 and/or the second fuse portion 340 have notches 360.

By providing the notch 360, the first fuse portion 330 and the second fuse portion 340 are easier to fuse at the position of the notch 360, and the fusing controllability of the first fuse portion 330 and the second fuse portion 340 can be improved.

In some embodiments, the area of the first connection portion 310 is not greater than the area of the second connection portion 320 on an orthographic projection of a plane on which the cover plate 500 is located.

It is understood that since the second connection part 320 is first connected by an external circuit or a Busbar, etc., the first connection part 310 serves as a spare connection part, which can improve the surface utilization of the pole piece 300. And the surface area of the first connection part 310 is not greater than that of the second connection part 320, so that the user can distinguish the first connection part 310 from the second connection part 320, and the situation that when the first connection part 310 and the second connection part 320 are connected in series, the user mistakenly connects an external circuit or a bus bar and the like to the first connection part 310, so that the second fusing part 340 cannot be used is avoided, and the service life of the pole piece 300 is prolonged.

Referring to fig. 1 to 3, in some embodiments, the top cap assembly 100 further includes a negative electrode pillar 220, a sealing ring 600, a lower plastic 700, a liquid injection hole 520, a flip piece 800, an explosion-proof piece 900, and other parts, and a user may select a suitable part according to actual needs without limitation.

The application also provides a power battery, the power battery includes top cap subassembly 100. Since the power battery has the top cap assembly 100, all the same advantages are achieved, and the description of the utility model is omitted.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The top cover assembly and the power battery provided by the embodiment of the present application are described in detail above, and a specific example is applied in the description to explain the principle and the implementation of the present application, and the description of the above embodiment is only used to help understand the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A header assembly, comprising:

the pole is arranged in the pole hole;

the pole block is arranged on one side of the cover plate and comprises a pole body, a first connecting part with a first fusing part and a second connecting part with a second fusing part; the pole body is connected with the pole, the first connecting part is connected with the pole body through the first fusing part, the second connecting part is connected with the first connecting part or the pole body through the second fusing part, and the cross sectional area of the first fusing part is not smaller than that of the second fusing part;

the upper plastic is arranged between the pole block and the cover plate.

2. The cap assembly of claim 1, wherein the first connection portion is disposed around the pole body, the first fuse portion is annular in shape, and the second connection portion is connected to the first connection portion through the second fuse portion.

3. The header assembly of claim 2, wherein the first fuse portion comprises a via segment and a connection segment.

4. The header assembly of claim 3, wherein the first fuse portion comprises a plurality of the connection segments arranged at intervals.

5. The header assembly of claim 3, wherein the connecting section comprises a first region and a second region, the first region having a cross-sectional area that is not less than the cross-sectional area of the second region.

6. The header assembly of claim 1, wherein the second connecting portion connects the pole body through the second fuse portion.

7. The header assembly of claim 1, wherein the second fuse portion is removably coupled to the first connection portion or the pole body.

8. The cap assembly of any one of claims 1-7, wherein the first fuse portion and/or the second fuse portion has a notch.

9. The header assembly of any one of claims 1-7, wherein an area of the first connecting portion is no greater than an area of the second connecting portion in an orthographic projection of a plane in which the cover plate lies.

10. A power cell comprising the cap assembly of any one of claims 1-9.