CN219267852U - Battery post, secondary battery and battery module - Google Patents

Abstract

The utility model provides a pole of a battery, a secondary battery and a battery module, and relates to the technical field of secondary batteries. The utmost point post is used for being connected with the utmost point ear electricity of the busbar of battery module and battery, and the utmost point post includes: a connection part capable of being fixedly and electrically connected with the busbar; and the fusing part is electrically connected between the connecting part and the lug, and the overcurrent area of the fusing part is smaller than that of the connecting part. When single battery is damaged or takes place the internal short circuit, the heavy current that produces can blow out the portion of fusing to effectual battery module and the battery package protect, avoid causing other spare parts to take place to become invalid because of local short circuit fires, cause bigger loss of property.

Description

Battery post, secondary battery and battery module

Technical Field

The present utility model relates to the field of secondary batteries, and more particularly, to a battery post, a secondary battery, and a battery module.

Background

Currently, in the market, in order to prevent the battery module or the battery pack from being exploded when short-circuited, a protection circuit is required to be provided for the battery. In the prior art, the protection circuit adopts the scheme that a fusing fuse is arranged in a main loop to conduct fusing protection.

However, there is a significant drawback to providing a fuse protection circuit in the main loop: when the battery module or the battery pack is impacted and locally deformed by extrusion, partial internal batteries may be locally short-circuited, thereby causing fire explosion. In this case, the fuse of the battery pack main circuit cannot cut off the damaged individual battery in time, eventually leading to the entire battery module or the battery pack to fire and explode.

Therefore, a new solution is needed to improve the safety of the battery module or the battery pack.

Disclosure of Invention

In view of the above problems, the present utility model provides a battery post, a secondary battery and a battery module, so as to overcome the problem that the prior art cannot cut off a damaged single battery in time, thereby creating a safety risk.

In order to achieve the above object, the present utility model provides a battery post for electrically connecting with a bus bar of a battery module and a tab of a battery, the post comprising: a connection part capable of being fixedly and electrically connected with the busbar; and the fusing part is electrically connected between the connecting part and the lug, and the overcurrent area of the fusing part is smaller than that of the connecting part.

Further, the fusing part comprises a first surface and a second surface which are oppositely arranged; the fusing part has an opening structure penetrating the first surface and the second surface.

Further, the opening structure is a plurality of, and a plurality of openings are arranged at intervals along the width direction of the pole.

Further, the opening structure is rectangular, diamond-shaped or circular along the direction from the first surface to the second surface.

Further, two fusing parts are respectively arranged at two ends of the connecting part and form

Or->

A shape structure.

Further, the connecting part and the fusing part are of an integrated structure.

Further, the present utility model also provides a secondary battery comprising: a housing assembly having a receiving cavity; the bare cell is accommodated in the accommodating cavity and comprises a pole lug; the pole of the battery is fixedly and electrically connected with the pole lug.

Further, the secondary battery further includes: the cover plate is used for sealing the bare cell in the accommodating cavity; the connecting part and the fusing part are both positioned on one side of the cover plate away from the bare cell.

Further, the secondary battery further includes: the cover plate is provided with an explosion-proof valve.

Further, the utility model also provides a battery module, which comprises the bus piece and the secondary battery; the confluence piece is fixedly and electrically connected with the connecting part.

According to the technical scheme provided by the embodiment of the utility model, the pole is used for being electrically connected with the busbar of the battery module and the pole lug of the battery, and comprises the connecting part and the fusing part, and the overcurrent area of the fusing part is smaller than that of the connecting part. So, when single battery is impaired or take place the internal short circuit, the heavy current that produces can blow out the portion of fusing to effectually protect battery module and battery package, avoid causing other spare parts to take place to become invalid because of local short circuit fires, cause bigger loss of property.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

fig. 1 shows a schematic structure of a secondary battery;

fig. 2 is a front view showing the structure of the secondary battery of fig. 1;

fig. 3 shows a schematic structure of a battery module.

1-a pole; 2-bus bars; 3-opening structure; 4-a secondary battery; 5-an explosion-proof valve; 6-confluence piece; 7-an insulating plate; 8-through holes; 9-side plates; 10-end plates; 101-a connection; 102-fusing part; 401-a housing assembly; 402-cover plate.

Detailed Description

Reference now will be made in detail to embodiments of the application, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation, not limitation, of the present application. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the scope or spirit of the application. For example, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Accordingly, it is intended that the present application cover such modifications and variations as come within the scope of the appended claims and their equivalents. As used in this specification, the terms "first," "second," and the like are used interchangeably to distinguish one component from another and are not intended to represent the location or importance of the respective components. As used in this specification, the terms "a," "an," "the," and "said" are intended to mean that there are one or more elements unless the context clearly indicates otherwise. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements. Wherein like numerals refer to like elements throughout, the present utility model is further explained below in connection with specific embodiments.

Fig. 1 shows a schematic structure of a secondary battery; fig. 2 is a front view showing the structure of the secondary battery of fig. 1; as shown in fig. 1 and 2, an embodiment of the present utility model provides a battery post 1, the post 1 being for electrical connection with a bus bar 2 of a battery module and a tab of the battery, the post 1 comprising: a connection portion 101, the connection portion 101 being capable of being fixedly and electrically connected to the busbar 2; the fusing part 102, the fusing part 102 is electrically connected between the connecting part 101 and the tab, and the overcurrent area of the fusing part 102 is smaller than that of the connecting part 101.

Wherein, the connection part 101 and the fusing part 102 may be combined to form a T-shape or an L-shape (not shown), the connection part 101 is located at the top of the T-shape or at the bottom of the L-shape, and one surface of the connection part 101 away from the fusing part 102 is connected with the bus bar 2, so that the contact area between the connection part 101 and the bus bar 2 can be increased.

Wherein, the surface of the connecting part 101 away from the fusing part 102 is a plane. The planar arrangement can facilitate connection of the connection portion 101 with the busbar 2, providing sufficient contact area and soldering location for connection.

Specifically, the overcurrent area of the fusing part 102 is smaller than that of the connecting part 101. When a short circuit occurs, the generated large current can blow the fuse portion 102 to generate fuse protection.

It should be noted that the size of the overcurrent area of the fusing part 102 should be determined according to the current range of the actual normal use condition.

Further, the connection portion 101 and the fusing portion 102 may be welded, or the connection portion 101 and the fusing portion 102 may be an integrally formed structure. The connection portion 101 and the fuse portion 102 may be electrically connected to each other.

The fusing part 102 and the tab of the secondary battery 4 may be laser welded.

The connection portion 101 and the fusing portion 102 are made of aluminum alloy or other conductive materials.

According to the technical scheme provided by the embodiment of the utility model, the pole 1 of the battery is used for being electrically connected with the busbar 2 of the battery module and the pole lug of the battery, and the pole 1 comprises: a connection portion 101, the connection portion 101 being capable of being fixedly and electrically connected to the busbar 2; the fusing part 102, the fusing part 102 is electrically connected between the connecting part 101 and the tab, and the overcurrent area of the fusing part 102 is smaller than that of the connecting part 101. When a single battery is damaged or internal short circuit occurs, the generated large current can fuse the fusing part 102, so that the battery module and the battery pack are effectively protected, and the other parts are prevented from losing efficacy due to the fact that local short circuit fires, and larger property loss is caused.

As shown in fig. 1 and 2, further, in the above embodiment, the fusing part 102 includes a first surface and a second surface that are disposed opposite to each other; the fusing part 102 has an opening structure 3 penetrating the first surface and the second surface. The arrangement of the opening structure 3 can improve the fusing effect.

Further, the number of the opening structures 3 is plural, and the plurality of opening structures 3 are arranged at intervals in the width direction of the pole 1.

Wherein, the meaning of interval setting is: adjacent opening structures 3 are arranged non-overlapping.

When a short circuit occurs, the connection between two adjacent opening structures 3 is broken.

In the present embodiment, the arrangement of the plurality of opening structures 3 can improve the fusing effect.

Further, the opening structure 3 is rectangular, diamond-shaped or circular along the direction from the first surface to the second surface.

Specifically, when the opening structures 3 are rectangular or diamond-shaped, two adjacent opening structures 3 may be disposed edge to edge, or may be disposed diagonally. When the adjacent two opening structures 3 are diagonally arranged, a route through which current flows is provided between the adjacent two corners, that is, a gap between the diagonal corners is a route through which current flows (as shown in fig. 2, arrows indicate routes through which current flows). When short circuit occurs, local current between the gaps is overlarge, and fusing can be generated at the gaps, so that the fusing effect is further improved.

As shown in fig. 1, in the above embodiment, two fusing parts 102 are further provided, and the two fusing parts 102 are respectively provided at both ends of the connection part 101 and form

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A shape structure.

Specifically, when two fusing portions 102 and a connecting portion 101 are formed

When (I)>

The corners of the shape can be processed into chamfers or fillets, so that people or equipment can be prevented from being scratched due to sharp edges.

In this embodiment, the two fusing parts 102 play a role in supporting and fixing the connection part 101, and at the same time,

or (b)

The bottom of the shaped arrangement forms a gas channel. If a single battery is damaged or internal short circuit occurs, generated gas can be discharged from two sides of the secondary battery 4 through the bottom of the pole 1, so that when the battery module fails, the gas can be discharged from two sides of the battery module, the gas is prevented from directly rushing through the upper cover of the battery pack, and the safety of the upper cover is protected.

As shown in fig. 1 and 2, further, on the basis of the above-described embodiment, an embodiment of the present utility model further provides a secondary battery 4 including: a housing assembly 401 having a receiving cavity; the bare cell is accommodated in the accommodating cavity and comprises a pole lug; as described above for the battery post 1, the post 1 is fixedly and electrically connected to the tab.

In this embodiment, the post 1 of the secondary battery 4 is used for electrically connecting with the busbar 2 of the battery module and the tab of the battery, and the post 1 includes a connection portion 101 and a fusing portion 102, and the overcurrent area of the fusing portion 102 is smaller than that of the connection portion 101. So, when single battery is impaired or take place the internal short circuit, the heavy current that produces can blow out portion 102 to effectual battery module and the battery package protect, avoid causing other spare parts to take place to become invalid because of local short circuit fires, cause bigger loss of property. Wherein the housing assembly 401 serves as a containment protection for the bare cell.

As shown in fig. 1 and 2, further, on the basis of the above-described embodiment, the secondary battery 4 further includes: a cover plate 402, wherein the cover plate 402 is used for sealing the bare cell in the accommodating cavity; the connection portion 101 and the fusing portion 102 are both located on a side of the cover plate 402 away from the bare cell.

Specifically, the number of the battery poles 1 is two, and the two poles 1 are symmetrically disposed above the cover plate 402 and are respectively disposed at the positive and negative electrodes of the secondary battery 4.

Further, the secondary battery 4 further includes: the cover plate 402 is provided with an explosion-proof valve 5.

Specifically, two fusing portions 102 and a connecting portion 101 are formed

Or->

In the form of a structure, the gas discharged from the explosion-proof valve 5 can be taken along +.>

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The secondary battery 4 is discharged from the bottom of the shape.

The secondary battery 4 provided in this embodiment, the post 1 is configured to be electrically connected to the busbar 2 of the battery module and the tab of the battery, and the post 1 includes a connection portion 101 and a fusing portion 102, where the overcurrent area of the fusing portion 102 is smaller than that of the connection portion 101. So, when single battery is impaired or take place the internal short circuit, the heavy current that produces can blow out portion 102 to effectual battery module and the battery package protect, avoid causing other spare parts to take place to become invalid because of local short circuit fires, cause bigger loss of property.

Fig. 3 shows a schematic structure of a battery module; as shown in fig. 3, further, on the basis of the above embodiment, the embodiment of the present utility model further provides a battery module including the bus bar 6 and the above secondary battery 4; the bus bar 6 is fixedly and electrically connected to the connection portion 101.

Specifically, the battery module further includes a busbar 2; the busbar 2 includes a plurality of bus bars 6; the plurality of bus bars 6 are connected to the plurality of secondary batteries 4, respectively, to form a power supply path.

The busbar 2 further comprises an insulating plate 7, a plurality of through holes 8 are formed in the insulating plate 7, the through holes 8 are correspondingly formed in the explosion-proof valve 5, and the through holes 8 at least partially overlap with the explosion-proof valve 5.

Specifically, the battery module further includes two side plates 9 and two end plates 10; the two side plates 9 and the two end plates 10 are sequentially spaced apart to surround the outer sides of the plurality of secondary batteries 4, and the insulating plate 7 covers the tops of the plurality of secondary batteries 4. The two side plates 9, the two end plates 10, and the bus bar 2 form a housing chamber for housing the plurality of secondary batteries 4, and function to protect the secondary batteries 4. The current collector 6 is used to ensure serial communication between the plurality of secondary batteries 4.

When short circuit occurs, the gas exhausted from the explosion-proof valve 5 can flow along

Or->

The secondary battery 4 is discharged from the bottom of the battery module, and the secondary battery 4 can also be discharged from the through hole 8, so that the condition that gas can be discharged at the upper part and the two sides of the battery module can be formed, the upper cover of the battery pack is prevented from being directly flushed by gas, and the safety of the upper cover is protected.

In the battery module provided in this embodiment, the current collector 6, the connection portion 101, the fusing portion 102, and the tab are electrically connected in order. The pole 1 is used for being electrically connected with the busbar 2 of the battery module and the tab of the battery, and the pole 1 comprises a connecting part 101 and a fusing part 102, wherein the overcurrent area of the fusing part 102 is smaller than that of the connecting part 101. So, when single battery is impaired or take place the internal short circuit, the heavy current that produces can blow out portion 102 to effectual battery module and the battery package protect, avoid causing other spare parts to take place to become invalid because of local short circuit fires, cause bigger loss of property.

While the foregoing is directed to the preferred embodiments of the present utility model, other and further modifications and improvements will readily occur to those skilled in the art based on the teachings herein, and it is intended that all such modifications and improvements be within the scope of this utility model. This written description uses examples to disclose the application, including the best mode, and also to enable any person skilled in the art to practice the application, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the application is defined by the claims, and may include other embodiments that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.

Claims (10)

1. A post of a battery, wherein the post is configured to be electrically connected to a bus bar of a battery module and a tab of the battery, the post comprising:

a connection portion capable of being fixedly and electrically connected with the bus bar;

and the fusing part is electrically connected between the connecting part and the tab, and the overcurrent area of the fusing part is smaller than that of the connecting part.

2. The battery post of claim 1, wherein the fuse portion comprises oppositely disposed first and second surfaces;

the fusing part has an opening structure penetrating the first surface and the second surface.

3. The battery post according to claim 2, wherein the opening structure is a plurality of openings arranged at intervals in the width direction of the post.

4. A post according to claim 3, wherein the opening structure is rectangular, diamond-shaped or circular in the direction from the first surface to the second surface.

5. The battery post according to claim 1, wherein the number of the fusing parts is two, and the two fusing parts are respectively provided at both ends of the connection part and form a'

"or" -/->

A "shape structure".

6. The battery post according to any one of claims 1 to 5, wherein the connecting portion and the fusing portion are of an integrally formed structure.

7. A secondary battery, characterized by comprising:

a housing assembly having a receiving cavity;

a bare cell accommodated in the accommodating cavity, the bare cell including a tab;

the battery post of any one of claims 1-6, the post being fixedly electrically connected to the tab.

8. The secondary battery according to claim 7, further comprising:

the cover plate is used for sealing the bare cell in the accommodating cavity;

the connecting part and the fusing part are both positioned at one side of the cover plate away from the bare cell.

9. The secondary battery according to claim 8, further comprising:

and an explosion-proof valve is arranged on the cover plate.

10. A battery module comprising a bus bar and the secondary battery according to any one of claims 7 to 9;

the confluence piece is fixedly and electrically connected with the connecting part.

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